Summary Update.

# Conflicts:
#	RelayClient/MainPage.xaml.cs
#	RelayClient/Services/RelaySocketClient.cs
#	RelayServer/Services/Chat/ChatSocketBehavior.cs
#	RelayServer/Services/Chat/ConnectedClientService.cs
#	RelayShared/Services/WsControlMessage.cs

Relay.sln

@@ -9,6 +9,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RelayClient", "RelayClient\
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RelayServer", "RelayServer\RelayServer.csproj", "{38995780-E9AA-44D6-B62D-07CCA45E4E4C}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RelayShared", "RelayShared\RelayShared.csproj", "{60B17B0B-9910-426A-9B48-AD9377AC89F7}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -55,6 +57,18 @@ Global
 		{38995780-E9AA-44D6-B62D-07CCA45E4E4C}.Release|x64.Build.0 = Release|Any CPU
 		{38995780-E9AA-44D6-B62D-07CCA45E4E4C}.Release|x86.ActiveCfg = Release|Any CPU
 		{38995780-E9AA-44D6-B62D-07CCA45E4E4C}.Release|x86.Build.0 = Release|Any CPU
+		{60B17B0B-9910-426A-9B48-AD9377AC89F7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{60B17B0B-9910-426A-9B48-AD9377AC89F7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{60B17B0B-9910-426A-9B48-AD9377AC89F7}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{60B17B0B-9910-426A-9B48-AD9377AC89F7}.Debug|x64.Build.0 = Debug|Any CPU
+		{60B17B0B-9910-426A-9B48-AD9377AC89F7}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{60B17B0B-9910-426A-9B48-AD9377AC89F7}.Debug|x86.Build.0 = Debug|Any CPU
+		{60B17B0B-9910-426A-9B48-AD9377AC89F7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{60B17B0B-9910-426A-9B48-AD9377AC89F7}.Release|Any CPU.Build.0 = Release|Any CPU
+		{60B17B0B-9910-426A-9B48-AD9377AC89F7}.Release|x64.ActiveCfg = Release|Any CPU
+		{60B17B0B-9910-426A-9B48-AD9377AC89F7}.Release|x64.Build.0 = Release|Any CPU
+		{60B17B0B-9910-426A-9B48-AD9377AC89F7}.Release|x86.ActiveCfg = Release|Any CPU
+		{60B17B0B-9910-426A-9B48-AD9377AC89F7}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

RelayClient/App.xaml.cs

@@ -1,16 +1,32 @@
-using Microsoft.Extensions.DependencyInjection;
+namespace RelayClient;
-
-namespace RelayClient;
 
 public partial class App : Application
 {
     public App()
     {
         InitializeComponent();
+
+        var username = Environment.GetCommandLineArgs()
+            .Skip(1)
+            .Chunk(2)
+            .Where(x => x.Length == 2 && x[0] == "--user")
+            .Select(x => x[1])
+            .FirstOrDefault();
+
+        if (string.IsNullOrWhiteSpace(username))
+        {
+            username = "Test";
+            // throw new Exception("Missing required --user argument. Example: --user Keeper317");
+        }
+
+        ClientSession.Username = username;
     }
 
     protected override Window CreateWindow(IActivationState? activationState)
     {
-        return new Window(new AppShell());
+        return new Window(new MainPage(ClientSession.Username))
+        {
+            Title = $"Relay Client - {ClientSession.Username}"
+        };
     }
 }

RelayClient/AppShell.xaml

@@ -4,7 +4,8 @@
     xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
     xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
     xmlns:local="clr-namespace:RelayClient"
-    Title="RelayClient">
+    Title="RelayClient"
+    FlyoutBehavior="Flyout">
 
     <ShellContent
         Title="Home"

RelayClient/ChatSimulator.cs

@@ -0,0 +1,8 @@
+namespace RelayClient;
+
+public sealed class ChatMessage
+{
+    public required string SenderUsername { get; set; }
+    public required string Text { get; set; }
+    public required DateTime Timestamp { get; set; }
+}

RelayClient/ClientSession.cs

@@ -0,0 +1,6 @@
+namespace RelayClient;
+
+public static class ClientSession
+{
+    public static string Username { get; set; } = "Unknown";
+}

RelayClient/Crypto/E2EeHelper.cs

@@ -0,0 +1,95 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace RelayClient.Crypto;
+
+/// <summary>
+/// Client-side mirror of RelayServer.Services.Crypto.E2EeHelper. Identical algorithms +
+/// key formats so blobs round-trip cleanly between server and client.
+/// See the server class for full algorithm details.
+/// </summary>
+public static class E2EeHelper
+{
+    /// <summary>Generates a fresh RSA-2048 keypair. Called once per user on first launch and persisted via KeyStorage.</summary>
+    public static (string publicKey, string privateKey) GenerateRsaKeyPair()
+    {
+        using var rsa = RSA.Create(2048);
+
+        return (
+            Convert.ToBase64String(rsa.ExportSubjectPublicKeyInfo()),
+            Convert.ToBase64String(rsa.ExportPkcs8PrivateKey())
+        );
+    }
+
+    /// <summary>
+    /// Hybrid encrypts a plaintext string for a specific recipient: fresh AES-256 key encrypts
+    /// the payload (AES-GCM), then RSA-OAEP-SHA256 wraps the AES key with the recipient's
+    /// public key. Returns base64-encoded fields ready to ship in a SocketEncryptedMessage.
+    /// </summary>
+    public static EncryptedPayload EncryptForRecipient(string plainText, string recipientPublicKeyBase64)
+    {
+        byte[] aesKey = RandomNumberGenerator.GetBytes(32);
+        byte[] nonce = RandomNumberGenerator.GetBytes(12);
+        byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);
+        byte[] cipherBytes = new byte[plainBytes.Length];
+        byte[] tag = new byte[16];
+
+        using (var aes = new AesGcm(aesKey, 16))
+        {
+            aes.Encrypt(nonce, plainBytes, cipherBytes, tag);
+        }
+
+        byte[] encryptedKey;
+        using (var rsa = RSA.Create())
+        {
+            rsa.ImportSubjectPublicKeyInfo(Convert.FromBase64String(recipientPublicKeyBase64), out _);
+            encryptedKey = rsa.Encrypt(aesKey, RSAEncryptionPadding.OaepSHA256);
+        }
+
+        return new EncryptedPayload
+        {
+            CipherText = Convert.ToBase64String(cipherBytes),
+            Nonce = Convert.ToBase64String(nonce),
+            Tag = Convert.ToBase64String(tag),
+            EncryptedKey = Convert.ToBase64String(encryptedKey)
+        };
+    }
+
+    /// <summary>
+    /// Reverse of EncryptForRecipient: RSA-decrypt the AES key with the recipient's private
+    /// key, then AES-GCM-decrypt the ciphertext. Throws on tampered/corrupt payloads
+    /// (auth tag mismatch). Returns the original UTF-8 plaintext string.
+    /// </summary>
+    public static string DecryptForRecipient(EncryptedPayload payload, string recipientPrivateKeyBase64)
+    {
+        byte[] aesKey;
+        using (var rsa = RSA.Create())
+        {
+            rsa.ImportPkcs8PrivateKey(Convert.FromBase64String(recipientPrivateKeyBase64), out _);
+            aesKey = rsa.Decrypt(Convert.FromBase64String(payload.EncryptedKey), RSAEncryptionPadding.OaepSHA256);
+        }
+
+        byte[] plainBytes = new byte[Convert.FromBase64String(payload.CipherText).Length];
+
+        using (var aes = new AesGcm(aesKey, 16))
+        {
+            aes.Decrypt(
+                Convert.FromBase64String(payload.Nonce),
+                Convert.FromBase64String(payload.CipherText),
+                Convert.FromBase64String(payload.Tag),
+                plainBytes
+            );
+        }
+
+        return Encoding.UTF8.GetString(plainBytes);
+    }
+}
+
+/// <summary>The 4-tuple ciphertext bundle. Same shape on both client and server; matches SocketEncryptedMessage's encrypted fields.</summary>
+public class EncryptedPayload
+{
+    public required string CipherText { get; set; }
+    public required string Nonce { get; set; }
+    public required string Tag { get; set; }
+    public required string EncryptedKey { get; set; }
+}

RelayClient/Crypto/KeyStorage.cs

@@ -0,0 +1,52 @@
+namespace RelayClient.Crypto;
+
+/// <summary>
+/// Per-user RSA keypair persistence. Keys live as base64-encoded files in
+/// {AppData}/keys/{username}.{public|private}.key
+///
+/// Plaintext on disk. For now this is fine because the only attack model is "someone else
+/// has access to your filesystem" — at which point everything is compromised. A future
+/// enhancement could encrypt the private key with a passphrase derived from the user's
+/// password, similar to how SSH/PGP do it.
+/// </summary>
+public static class KeyStorage
+{
+    /// <summary>Returns (and creates if needed) the per-app keys directory.</summary>
+    private static string GetKeyFolder()
+    {
+        var folder = Path.Combine(FileSystem.AppDataDirectory, "keys");
+        Directory.CreateDirectory(folder);
+        return folder;
+    }
+
+    /// <summary>Writes the base64 RSA private key to disk. Used at first-launch after GenerateRsaKeyPair.</summary>
+    public static void SavePrivateKey(string username, string privateKey)
+    {
+        File.WriteAllText(Path.Combine(GetKeyFolder(), $"{username}.private.key"), privateKey);
+    }
+
+    /// <summary>Writes the base64 RSA public key to disk. Sent to the server via WsAction.RegisterKey.</summary>
+    public static void SavePublicKey(string username, string publicKey)
+    {
+        File.WriteAllText(Path.Combine(GetKeyFolder(), $"{username}.public.key"), publicKey);
+    }
+
+    /// <summary>Reads the user's RSA private key. Used by TryDecryptAndParseContent on every inbound message.</summary>
+    public static string LoadPrivateKey(string username)
+    {
+        return File.ReadAllText(Path.Combine(GetKeyFolder(), $"{username}.private.key"));
+    }
+
+    /// <summary>Reads the user's RSA public key. Used during the boot handshake to send to the server.</summary>
+    public static string LoadPublicKey(string username)
+    {
+        return File.ReadAllText(Path.Combine(GetKeyFolder(), $"{username}.public.key"));
+    }
+
+    /// <summary>True if BOTH halves of the user's keypair already exist on disk. False means we need to generate.</summary>
+    public static bool HasKeys(string username)
+    {
+        return File.Exists(Path.Combine(GetKeyFolder(), $"{username}.private.key")) &&
+               File.Exists(Path.Combine(GetKeyFolder(), $"{username}.public.key"));
+    }
+}

RelayClient/Helpers/EmbedHelper.cs

@@ -0,0 +1,498 @@
+using System.Net.Http;
+using System.Text.RegularExpressions;
+
+namespace RelayClient.Helpers;
+
+/// <summary>
+/// Detects URLs in message text and builds embed views:
+/// • Direct image URLs   → inline Image (loaded lazily from URI or base64).
+/// • relay:// jump links → tappable "Jump to message" card.
+/// • Everything else     → a link card with an async OG-tag preview loaded in the background.
+/// </summary>
+public static class EmbedHelper
+{
+    private static readonly Regex UrlPattern = new(
+        @"https?://[^\s<>""]+",
+        RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
+    private static readonly Regex RelayJumpPattern = new(
+        @"relay://jump/([^/]+)/(.+)",
+        RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
+    private static readonly HashSet<string> ImageExtensions =
+        [".jpg", ".jpeg", ".png", ".gif", ".webp", ".bmp", ".avif"];
+
+    /// <summary>Extracts every distinct http/https URL from message text. De-duped so multiple occurrences don't double-embed.</summary>
+    public static List<string> DetectUrls(string text)
+    {
+        if (string.IsNullOrWhiteSpace(text)) return [];
+        return UrlPattern.Matches(text).Select(m => m.Value).Distinct().ToList();
+    }
+
+    /// <summary>
+    /// Dispatcher: classifies each URL and delegates to the appropriate Build* method.
+    /// Order matters — jump links and YouTube/Vimeo IDs are checked before the generic
+    /// image-extension and link-card paths so the more specific embed wins.
+    /// </summary>
+    public static List<View> BuildEmbeds(string text)
+    {
+        var views = new List<View>();
+        foreach (var url in DetectUrls(text))
+        {
+            try
+            {
+                if (RelayJumpPattern.IsMatch(url))
+                    views.Add(BuildJumpCard(url));
+                else if (TryGetYouTubeId(url, out var ytId))
+                    views.Add(BuildYouTubeCard(url, ytId));
+                else if (TryGetVimeoId(url, out var vimeoId))
+                    views.Add(BuildVimeoCard(url, vimeoId));
+                else if (IsImageUrl(url))
+                    views.Add(BuildImageEmbed(url));
+                else
+                    views.Add(BuildLinkCard(url));
+            }
+            catch { /* never crash the UI */ }
+        }
+        return views;
+    }
+
+    /// <summary>
+    /// Decodes a base64 attachment to bytes and renders it as an inline Image. Used by
+    /// MainPage.BuildBubbleContent when a message has an image attachment.
+    /// </summary>
+    public static View BuildBase64ImageEmbed(string base64, string fileName)
+    {
+        try
+        {
+            var bytes  = Convert.FromBase64String(base64);
+            var source = ImageSource.FromStream(() => new MemoryStream(bytes));
+
+            var image = new Image
+            {
+                Source            = source,
+                Aspect            = Aspect.AspectFit,
+                WidthRequest      = 400,
+                MaximumHeightRequest = 300,
+                HorizontalOptions = LayoutOptions.Start
+            };
+
+            return new Border
+            {
+                StrokeThickness = 1,
+                Padding         = new Thickness(4),
+                Margin          = new Thickness(0, 4, 0, 0),
+                Content         = image
+            };
+        }
+        catch
+        {
+            return new Label
+            {
+                Text      = $"⚠ Could not render image: {fileName}",
+                FontSize  = 12,
+                TextColor = Colors.Gray
+            };
+        }
+    }
+
+    /// <summary>
+    /// Renders a non-image attachment as a tappable card. Tap → writes the bytes to a temp
+    /// file and hands off to the system handler via Launcher.OpenAsync.
+    /// </summary>
+    public static View BuildFileCard(string base64, string fileName, string mimeType)
+    {
+        var label = new Label
+        {
+            Text            = $"📎 {fileName}",
+            FontSize        = 13,
+            TextColor       = Color.FromArgb("#5DA8FF"),
+            TextDecorations = TextDecorations.Underline
+        };
+
+        var tap = new TapGestureRecognizer();
+        tap.Tapped += async (_, _) =>
+        {
+            try
+            {
+                var bytes    = Convert.FromBase64String(base64);
+                var tempPath = Path.Combine(Path.GetTempPath(), fileName);
+                await File.WriteAllBytesAsync(tempPath, bytes);
+                await Launcher.OpenAsync(new OpenFileRequest
+                {
+                    File = new ReadOnlyFile(tempPath)
+                });
+            }
+            catch { /* ignore launch errors */ }
+        };
+        label.GestureRecognizers.Add(tap);
+
+        return new Border
+        {
+            StrokeThickness = 1,
+            Padding         = new Thickness(8, 6),
+            Margin          = new Thickness(0, 4, 0, 0),
+            Content         = label
+        };
+    }
+
+    /// <summary>Direct image URL → inline Image (loaded async by MAUI from the URI). Tap opens in browser.</summary>
+    private static View BuildImageEmbed(string url)
+    {
+        var image = new Image
+        {
+            Source               = ImageSource.FromUri(new Uri(url)),
+            Aspect               = Aspect.AspectFit,
+            WidthRequest         = 400,
+            MaximumHeightRequest = 300,
+            HorizontalOptions    = LayoutOptions.Start
+        };
+
+        var tap = new TapGestureRecognizer();
+        tap.Tapped += (_, _) => _ = Launcher.OpenAsync(new Uri(url));
+        image.GestureRecognizers.Add(tap);
+
+        return new Border
+        {
+            StrokeThickness = 1,
+            Padding         = new Thickness(4),
+            Margin          = new Thickness(0, 4, 0, 0),
+            Content         = image
+        };
+    }
+
+    /// <summary>
+    /// Builds the "💬 Jump to linked message" card for relay://jump URLs. The actual tap
+    /// handler is wired by MainPage.WireJumpLinks because it needs access to the message
+    /// bubble dictionary that EmbedHelper doesn't know about.
+    /// </summary>
+    private static View BuildJumpCard(string relayUrl)
+    {
+        var label = new Label
+        {
+            Text            = "💬 Jump to linked message",
+            FontSize        = 12,
+            TextColor       = Color.FromArgb("#9ECEFF"),
+            TextDecorations = TextDecorations.Underline
+        };
+
+        label.SetValue(JumpUrlProperty, relayUrl);
+
+        return new Border
+        {
+            StrokeThickness = 1,
+            Padding         = new Thickness(8, 4),
+            Margin          = new Thickness(0, 4, 0, 0),
+            Content         = label
+        };
+    }
+
+    /// <summary>Attached property that stores the relay:// URL on the jump label so MainPage.WireJumpLinks can find it.</summary>
+    public static readonly BindableProperty JumpUrlProperty =
+        BindableProperty.CreateAttached("JumpUrl", typeof(string), typeof(EmbedHelper), null);
+
+    /// <summary>
+    /// Generic URL card. Starts with just the URL itself; spawns a background task to fetch
+    /// OG meta tags from the page and append a title/description/preview-image when the
+    /// response arrives. The whole card is tappable to open the URL in the browser.
+    /// </summary>
+    private static View BuildLinkCard(string url)
+    {
+        var displayUrl = url.Length > 55 ? url[..52] + "…" : url;
+
+        var card = new VerticalStackLayout { Spacing = 4 };
+
+        var urlLabel = new Label
+        {
+            Text            = "🔗 " + displayUrl,
+            FontSize        = 12,
+            TextColor       = Color.FromArgb("#5DA8FF"),
+            TextDecorations = TextDecorations.Underline,
+            LineBreakMode   = LineBreakMode.TailTruncation
+        };
+
+        var tapUrl = new TapGestureRecognizer();
+        tapUrl.Tapped += (_, _) => _ = Launcher.OpenAsync(new Uri(url));
+        urlLabel.GestureRecognizers.Add(tapUrl);
+        card.Children.Add(urlLabel);
+
+        _ = Task.Run(async () =>
+        {
+            var og = await FetchOgTagsAsync(url);
+            if (og is null) return;
+
+            MainThread.BeginInvokeOnMainThread(() =>
+            {
+                if (!string.IsNullOrWhiteSpace(og.Title))
+                {
+                    card.Children.Add(new Label
+                    {
+                        Text      = og.Title,
+                        FontSize  = 13,
+                        FontAttributes = FontAttributes.Bold,
+                        MaxLines  = 2,
+                        LineBreakMode = LineBreakMode.TailTruncation
+                    });
+                }
+
+                if (!string.IsNullOrWhiteSpace(og.Description))
+                {
+                    card.Children.Add(new Label
+                    {
+                        Text      = og.Description,
+                        FontSize  = 11,
+                        TextColor = Colors.LightGray,
+                        MaxLines  = 3,
+                        LineBreakMode = LineBreakMode.TailTruncation
+                    });
+                }
+
+                if (!string.IsNullOrWhiteSpace(og.ImageUrl) && IsImageUrl(og.ImageUrl))
+                {
+                    card.Children.Add(new Image
+                    {
+                        Source               = ImageSource.FromUri(new Uri(og.ImageUrl)),
+                        Aspect               = Aspect.AspectFit,
+                        WidthRequest         = 360,
+                        MaximumHeightRequest = 200,
+                        HorizontalOptions    = LayoutOptions.Start
+                    });
+                }
+            });
+        });
+
+        return new Border
+        {
+            StrokeThickness = 1,
+            Padding         = new Thickness(8, 6),
+            Margin          = new Thickness(0, 4, 0, 0),
+            Content         = card
+        };
+    }
+
+    private sealed record OgData(string? Title, string? Description, string? ImageUrl);
+
+    /// <summary>
+    /// 4-second-budget HTTP GET + regex extract of og:title, og:description, og:image meta
+    /// tags from a page's HTML. Returns null on any failure (so the link card just stays bare).
+    /// </summary>
+    private static async Task<OgData?> FetchOgTagsAsync(string url)
+    {
+        try
+        {
+            using var client = new HttpClient { Timeout = TimeSpan.FromSeconds(4) };
+            client.DefaultRequestHeaders.Add("User-Agent", "Relay/1.0 (link preview)");
+
+            var html = await client.GetStringAsync(url);
+
+            var title       = GetMetaContent(html, "og:title")
+                           ?? GetTitleTag(html);
+            var description = GetMetaContent(html, "og:description");
+            var image       = GetMetaContent(html, "og:image");
+
+            if (title is null && description is null && image is null) return null;
+            return new OgData(title, description, image);
+        }
+        catch { return null; }
+    }
+
+    private static string? GetMetaContent(string html, string property)
+    {
+        var pattern = $"""<meta[^>]+property=["']{Regex.Escape(property)}["'][^>]+content=["']([^"']+)["']""";
+        var m = Regex.Match(html, pattern, RegexOptions.IgnoreCase);
+        if (m.Success) return System.Net.WebUtility.HtmlDecode(m.Groups[1].Value.Trim());
+
+        var pattern2 = $"""<meta[^>]+content=["']([^"']+)["'][^>]+property=["']{Regex.Escape(property)}["']""";
+        m = Regex.Match(html, pattern2, RegexOptions.IgnoreCase);
+        return m.Success ? System.Net.WebUtility.HtmlDecode(m.Groups[1].Value.Trim()) : null;
+    }
+
+    private static string? GetTitleTag(string html)
+    {
+        var m = Regex.Match(html, @"<title[^>]*>([^<]+)</title>", RegexOptions.IgnoreCase);
+        return m.Success ? System.Net.WebUtility.HtmlDecode(m.Groups[1].Value.Trim()) : null;
+    }
+
+    /// <summary>True if the URL's path ends with a known image extension. Used to choose between BuildImageEmbed and BuildLinkCard.</summary>
+    private static bool IsImageUrl(string url)
+    {
+        try
+        {
+            var path = new Uri(url).AbsolutePath;
+            var ext  = Path.GetExtension(path).ToLowerInvariant();
+            return ImageExtensions.Contains(ext);
+        }
+        catch { return false; }
+    }
+
+    private static readonly Regex YouTubePattern = new(
+        @"(?:youtube\.com/(?:watch\?(?:.*&)?v=|embed/|shorts/|v/)|youtu\.be/)([A-Za-z0-9_-]{6,})",
+        RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
+    /// <summary>Extracts the 11-char video ID from any YouTube URL form (watch, youtu.be, embed, shorts, /v/).</summary>
+    private static bool TryGetYouTubeId(string url, out string id)
+    {
+        var match = YouTubePattern.Match(url);
+        if (match.Success)
+        {
+            id = match.Groups[1].Value;
+            return true;
+        }
+        id = string.Empty;
+        return false;
+    }
+
+    private static readonly Regex VimeoPattern = new(
+        @"vimeo\.com/(?:video/|channels/[^/]+/|groups/[^/]+/videos/)?(\d{6,})",
+        RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
+    /// <summary>Extracts the numeric video ID from Vimeo URLs. Handles vimeo.com/{id}, /video/{id}, channels/x/{id}, groups/x/videos/{id}.</summary>
+    private static bool TryGetVimeoId(string url, out string id)
+    {
+        var match = VimeoPattern.Match(url);
+        if (match.Success)
+        {
+            id = match.Groups[1].Value;
+            return true;
+        }
+        id = string.Empty;
+        return false;
+    }
+
+    /// <summary>YouTube embed card. Thumbnail comes from img.youtube.com; player swaps to the youtube.com/embed/ URL on tap.</summary>
+    private static View BuildYouTubeCard(string url, string videoId) =>
+        BuildVideoCardWithEmbed(
+            providerLabel:  "🎬 YouTube",
+            providerColor:  Color.FromArgb("#FF4444"),
+            externalUrl:    url,
+            thumbnailUrl:   $"https://img.youtube.com/vi/{videoId}/hqdefault.jpg",
+            embedUrl:       $"https://www.youtube.com/embed/{videoId}?autoplay=1&rel=0");
+
+    /// <summary>Vimeo embed card. No thumbnail (Vimeo's API requires OAuth); placeholder stays black with a play badge until tap.</summary>
+    private static View BuildVimeoCard(string url, string videoId) =>
+        BuildVideoCardWithEmbed(
+            providerLabel:  "🎬 Vimeo",
+            providerColor:  Color.FromArgb("#1AB7EA"),
+            externalUrl:    url,
+            thumbnailUrl:   null, // Vimeo thumbs require an API call; skip and show a black placeholder
+            embedUrl:       $"https://player.vimeo.com/video/{videoId}?autoplay=1");
+
+    /// <summary>
+    /// The lazy-swap player. Default content is BuildThumbnailPlaceholder (cheap — no WebView
+    /// spawned). On tap, the ContentView's content swaps to a WebView pointing at embedUrl.
+    /// Means 50 videos in scrollback = 50 thumbnails, not 50 WebViews.
+    /// </summary>
+    private static View BuildVideoCardWithEmbed(
+        string providerLabel,
+        Color providerColor,
+        string externalUrl,
+        string? thumbnailUrl,
+        string embedUrl)
+    {
+        var card = new VerticalStackLayout { Spacing = 4 };
+
+        var headerRow = new HorizontalStackLayout { Spacing = 10 };
+        headerRow.Children.Add(new Label
+        {
+            Text           = providerLabel,
+            FontSize       = 11,
+            FontAttributes = FontAttributes.Bold,
+            TextColor      = providerColor
+        });
+
+        var openExternal = new Label
+        {
+            Text            = "↗ Open in browser",
+            FontSize        = 10,
+            TextColor       = Color.FromArgb("#8E8E93"),
+            TextDecorations = TextDecorations.Underline
+        };
+        var openTap = new TapGestureRecognizer();
+        openTap.Tapped += (_, _) => _ = Launcher.OpenAsync(new Uri(externalUrl));
+        openExternal.GestureRecognizers.Add(openTap);
+        headerRow.Children.Add(openExternal);
+
+        card.Children.Add(headerRow);
+
+        var playerHost = new ContentView
+        {
+            HorizontalOptions = LayoutOptions.Start,
+            Content           = BuildThumbnailPlaceholder(thumbnailUrl, () =>
+            {
+                // On tap → swap the placeholder for a real player.
+            })
+        };
+
+        playerHost.Content = BuildThumbnailPlaceholder(thumbnailUrl, () =>
+        {
+            playerHost.Content = BuildEmbeddedPlayer(embedUrl);
+        });
+
+        card.Children.Add(playerHost);
+
+        return new Border
+        {
+            StrokeThickness = 1,
+            Padding         = new Thickness(8, 6),
+            Margin          = new Thickness(0, 4, 0, 0),
+            Content         = card
+        };
+    }
+
+    /// <summary>
+    /// 16:9 thumbnail (or solid black if no thumb URL) with a translucent black play-badge
+    /// overlay. Calling onPlay swaps the parent ContentView's content to the real WebView.
+    /// </summary>
+    private static View BuildThumbnailPlaceholder(string? thumbnailUrl, Action onPlay)
+    {
+        var grid = new Grid
+        {
+            WidthRequest      = 400,
+            HeightRequest     = 225,
+            BackgroundColor   = Colors.Black,
+            HorizontalOptions = LayoutOptions.Start
+        };
+
+        if (!string.IsNullOrWhiteSpace(thumbnailUrl))
+        {
+            grid.Children.Add(new Image
+            {
+                Source = ImageSource.FromUri(new Uri(thumbnailUrl)),
+                Aspect = Aspect.AspectFill
+            });
+        }
+
+        var playBadge = new Label
+        {
+            Text                    = "▶",
+            FontSize                = 36,
+            TextColor               = Colors.White,
+            BackgroundColor         = Color.FromArgb("#CC000000"),
+            HorizontalTextAlignment = TextAlignment.Center,
+            VerticalTextAlignment   = TextAlignment.Center,
+            WidthRequest            = 64,
+            HeightRequest           = 64,
+            HorizontalOptions       = LayoutOptions.Center,
+            VerticalOptions         = LayoutOptions.Center
+        };
+        grid.Children.Add(playBadge);
+
+        var tap = new TapGestureRecognizer();
+        tap.Tapped += (_, _) => onPlay();
+        grid.GestureRecognizers.Add(tap);
+
+        return grid;
+    }
+
+    /// <summary>The actual in-client video player. WebView2 (Windows) and WebKit (mobile) both handle YouTube/Vimeo embed pages.</summary>
+    private static View BuildEmbeddedPlayer(string embedUrl)
+    {
+        return new WebView
+        {
+            Source            = embedUrl,
+            WidthRequest      = 480,
+            HeightRequest     = 270,
+            HorizontalOptions = LayoutOptions.Start
+        };
+    }
+}

RelayClient/Helpers/MarkdownHelper.cs

@@ -0,0 +1,411 @@
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace RelayClient.Helpers;
+
+public static class MarkdownHelper
+{
+    private static readonly Regex FencedCode =
+        new(@"```([A-Za-z0-9_+#-]*)\r?\n?(.*?)```", RegexOptions.Singleline | RegexOptions.Compiled);
+
+    private static readonly Color MentionText = Color.FromArgb("#9EA8FF");
+    private static readonly Color MentionBg   = Color.FromArgb("#2D2F5C");
+    private static readonly Color SpoilerBg   = Color.FromArgb("#1F1F23");
+
+    /// <summary>
+    /// The entry point. Returns either a single Label (simple inline text) or a
+    /// VerticalStackLayout (anything with paragraphs, code blocks, or headers).
+    /// First pass extracts fenced code blocks (verbatim, can span multiple lines), then
+    /// AppendTextSegment handles per-line headers and the inline parser.
+    /// </summary>
+    public static View Render(string markdown, double fontSize = 14)
+    {
+        if (string.IsNullOrEmpty(markdown))
+            return new Label { Text = string.Empty, FontSize = fontSize };
+
+        var stack = new VerticalStackLayout { Spacing = 2 };
+
+        var matches = FencedCode.Matches(markdown);
+        int cursor = 0;
+
+        foreach (Match m in matches)
+        {
+            if (m.Index > cursor)
+                AppendTextSegment(stack, markdown[cursor..m.Index], fontSize);
+
+            stack.Children.Add(CreateCodeBlock(m.Groups[1].Value.Trim(), m.Groups[2].Value.TrimEnd()));
+            cursor = m.Index + m.Length;
+        }
+
+        if (cursor < markdown.Length)
+            AppendTextSegment(stack, markdown[cursor..], fontSize);
+
+        return stack.Children.Count == 1 ? (View)stack.Children[0] : stack;
+    }
+
+    /// <summary>
+    /// Splits a non-code segment by newline and emits the right view per line. Headers/subtext
+    /// get their own labels; consecutive normal lines accumulate into a paragraph buffer so
+    /// they wrap naturally as one paragraph.
+    /// </summary>
+    private static void AppendTextSegment(VerticalStackLayout stack, string segment, double fontSize)
+    {
+        var paragraphBuffer = new StringBuilder();
+
+        void FlushParagraph()
+        {
+            if (paragraphBuffer.Length == 0) return;
+            stack.Children.Add(CreateInlineLabel(paragraphBuffer.ToString(), fontSize));
+            paragraphBuffer.Clear();
+        }
+
+        foreach (var rawLine in segment.Split('\n'))
+        {
+            var line = rawLine.TrimEnd('\r');
+
+            if (string.IsNullOrWhiteSpace(line))
+            {
+                FlushParagraph();
+                continue;
+            }
+
+            if (line.StartsWith("### "))
+            {
+                FlushParagraph();
+                stack.Children.Add(CreateHeaderLabel(line[4..], fontSize + 3));
+                continue;
+            }
+
+            if (line.StartsWith("## "))
+            {
+                FlushParagraph();
+                stack.Children.Add(CreateHeaderLabel(line[3..], fontSize + 6));
+                continue;
+            }
+
+            if (line.StartsWith("# "))
+            {
+                FlushParagraph();
+                stack.Children.Add(CreateHeaderLabel(line[2..], fontSize + 10));
+                continue;
+            }
+
+            if (line.StartsWith("-# "))
+            {
+                FlushParagraph();
+                stack.Children.Add(CreateSubtextLabel(line[3..], fontSize - 3));
+                continue;
+            }
+
+            if (paragraphBuffer.Length > 0)
+                paragraphBuffer.Append('\n');
+            paragraphBuffer.Append(line);
+        }
+
+        FlushParagraph();
+    }
+
+    /// <summary>
+    /// Builds the dark-pane code block. If a language is specified, delegates token coloring
+    /// to SyntaxHighlighter and prepends a small green language label (Discord-style).
+    /// </summary>
+    private static View CreateCodeBlock(string language, string code)
+    {
+        var label = new Label
+        {
+            FontFamily    = "AnonymousProRegular",
+            FontSize      = 12,
+            TextColor     = Color.FromArgb("#D4D4D4"),
+            LineBreakMode = LineBreakMode.WordWrap
+        };
+
+        var spans = SyntaxHighlighter.Highlight(code, language, 12);
+        if (spans.Count > 0)
+        {
+            var fs = new FormattedString();
+            foreach (var s in spans) fs.Spans.Add(s);
+            label.FormattedText = fs;
+        }
+        else
+        {
+            label.Text = code;
+        }
+
+        var stack = new VerticalStackLayout { Spacing = 4 };
+
+        if (!string.IsNullOrWhiteSpace(language))
+        {
+            stack.Children.Add(new Label
+            {
+                Text           = language.ToLowerInvariant(),
+                FontFamily     = "AnonymousProRegular",
+                FontSize       = 10,
+                TextColor      = Color.FromArgb("#6A9955"),
+                FontAttributes = FontAttributes.Bold
+            });
+        }
+
+        stack.Children.Add(label);
+
+        return new Border
+        {
+            BackgroundColor = Color.FromArgb("#1E1E1E"),
+            StrokeThickness = 0,
+            Padding         = new Thickness(10, 6),
+            Content         = stack
+        };
+    }
+
+    /// <summary>Bold, larger Label for # / ## / ### lines. Inline markdown still works inside (e.g. `# Hello **world**`).</summary>
+    private static Label CreateHeaderLabel(string text, double size)
+    {
+        var label = new Label
+        {
+            FontSize       = size,
+            FontAttributes = FontAttributes.Bold,
+            LineBreakMode  = LineBreakMode.WordWrap,
+            Margin         = new Thickness(0, 4, 0, 2)
+        };
+
+        var fs = new FormattedString();
+        var spoilerSpans = new List<Span>();
+        ParseInline(text, fs.Spans, size, spoilerSpans);
+
+        if (fs.Spans.Count > 0) label.FormattedText = fs;
+        else label.Text = text;
+
+        WireSpoilerTap(label, spoilerSpans);
+        return label;
+    }
+
+    /// <summary>Smaller, grey Label for "-#" lines (Discord calls it subtext). Inherits inline markdown.</summary>
+    private static Label CreateSubtextLabel(string text, double size)
+    {
+        var label = new Label
+        {
+            FontSize       = size,
+            TextColor      = Color.FromArgb("#8E8E93"),
+            LineBreakMode  = LineBreakMode.WordWrap
+        };
+
+        var fs = new FormattedString();
+        var spoilerSpans = new List<Span>();
+        ParseInline(text, fs.Spans, size, spoilerSpans);
+
+        if (fs.Spans.Count > 0)
+        {
+            foreach (var s in fs.Spans)
+                s.TextColor ??= Color.FromArgb("#8E8E93");
+            label.FormattedText = fs;
+        }
+        else
+        {
+            label.Text = text;
+        }
+
+        WireSpoilerTap(label, spoilerSpans);
+        return label;
+    }
+
+    /// <summary>Standard paragraph Label. Runs the inline parser to build a FormattedString of spans.</summary>
+    private static Label CreateInlineLabel(string text, double fontSize)
+    {
+        var label = new Label { FontSize = fontSize, LineBreakMode = LineBreakMode.WordWrap };
+        var fs = new FormattedString();
+        var spoilerSpans = new List<Span>();
+        ParseInline(text, fs.Spans, fontSize, spoilerSpans);
+
+        if (fs.Spans.Count > 0) label.FormattedText = fs;
+        else label.Text = text;
+
+        WireSpoilerTap(label, spoilerSpans);
+        return label;
+    }
+
+    /// <summary>
+    /// Attaches a TapGestureRecognizer that reveals every spoiler span in the label when
+    /// tapped once. MAUI Spans can't fire their own gesture events, so per-spoiler reveal
+    /// would require splitting the line into separate labels — this is the pragmatic compromise.
+    /// </summary>
+    private static void WireSpoilerTap(Label label, List<Span> spoilerSpans)
+    {
+        if (spoilerSpans.Count == 0) return;
+
+        var tap = new TapGestureRecognizer();
+        tap.Tapped += (_, _) =>
+        {
+            foreach (var s in spoilerSpans)
+            {
+                s.BackgroundColor = Colors.Transparent;
+                s.TextColor       = null; // fall back to default label color
+            }
+        };
+        label.GestureRecognizers.Add(tap);
+    }
+
+    /// <summary>
+    /// Single-pass character walk. For each markdown sigil (||, @, ~~, __, **, *, `), tries
+    /// to find a matching closer; if found, emits a styled Span and skips past. Otherwise the
+    /// char accumulates into a "plain" buffer that's flushed as a plain Span when the next
+    /// sigil hits or the string ends. Spoiler spans are registered in spoilerSpans for reveal.
+    /// </summary>
+    private static void ParseInline(string text, IList<Span> spans, double fontSize, List<Span> spoilerSpans)
+    {
+        var plain = new StringBuilder();
+        int i = 0;
+
+        void Flush()
+        {
+            if (plain.Length == 0) return;
+            spans.Add(new Span { Text = plain.ToString(), FontSize = fontSize });
+            plain.Clear();
+        }
+
+        while (i < text.Length)
+        {
+            char c = text[i];
+
+            if (c == '|' && Peek(text, i + 1) == '|')
+            {
+                int end = text.IndexOf("||", i + 2, StringComparison.Ordinal);
+                if (end > i + 2)
+                {
+                    Flush();
+                    var span = new Span
+                    {
+                        Text            = text[(i + 2)..end],
+                        FontSize        = fontSize,
+                        BackgroundColor = SpoilerBg,
+                        TextColor       = SpoilerBg  // text invisible until revealed
+                    };
+                    spans.Add(span);
+                    spoilerSpans.Add(span);
+                    i = end + 2;
+                    continue;
+                }
+            }
+
+            if (c == '@' && i + 1 < text.Length &&
+                (char.IsLetter(text[i + 1]) || text[i + 1] == '_'))
+            {
+                int end = i + 1;
+                while (end < text.Length && (char.IsLetterOrDigit(text[end]) || text[end] == '_'))
+                    end++;
+
+                Flush();
+                spans.Add(new Span
+                {
+                    Text            = text[i..end],
+                    TextColor       = MentionText,
+                    BackgroundColor = MentionBg,
+                    FontAttributes  = FontAttributes.Bold,
+                    FontSize        = fontSize
+                });
+                i = end;
+                continue;
+            }
+
+            if (c == '~' && Peek(text, i + 1) == '~')
+            {
+                int end = text.IndexOf("~~", i + 2, StringComparison.Ordinal);
+                if (end > i + 2)
+                {
+                    Flush();
+                    spans.Add(new Span
+                    {
+                        Text            = text[(i + 2)..end],
+                        FontSize        = fontSize,
+                        TextDecorations = TextDecorations.Strikethrough
+                    });
+                    i = end + 2; continue;
+                }
+            }
+
+            if (c == '_' && Peek(text, i + 1) == '_')
+            {
+                int end = text.IndexOf("__", i + 2, StringComparison.Ordinal);
+                if (end > i + 2)
+                {
+                    Flush();
+                    spans.Add(new Span
+                    {
+                        Text            = text[(i + 2)..end],
+                        FontSize        = fontSize,
+                        TextDecorations = TextDecorations.Underline
+                    });
+                    i = end + 2; continue;
+                }
+            }
+
+            if (c == '*' && Peek(text, i + 1) == '*')
+            {
+                int end = text.IndexOf("**", i + 2, StringComparison.Ordinal);
+                if (end > i + 2)
+                {
+                    Flush();
+                    spans.Add(new Span
+                    {
+                        Text           = text[(i + 2)..end],
+                        FontSize       = fontSize,
+                        FontAttributes = FontAttributes.Bold
+                    });
+                    i = end + 2; continue;
+                }
+            }
+
+            if (c == '*' && Peek(text, i + 1) != '*')
+            {
+                int end = FindClosingSingle(text, '*', i + 1);
+                if (end > i + 1)
+                {
+                    Flush();
+                    spans.Add(new Span
+                    {
+                        Text           = text[(i + 1)..end],
+                        FontSize       = fontSize,
+                        FontAttributes = FontAttributes.Italic
+                    });
+                    i = end + 1; continue;
+                }
+            }
+
+            if (c == '`')
+            {
+                int end = text.IndexOf('`', i + 1);
+                if (end > i + 1)
+                {
+                    Flush();
+                    spans.Add(new Span
+                    {
+                        Text            = text[(i + 1)..end],
+                        FontFamily      = "AnonymousProRegular",
+                        FontSize        = fontSize - 1,
+                        BackgroundColor = Color.FromArgb("#2D2D2D"),
+                        TextColor       = Color.FromArgb("#CE9178")
+                    });
+                    i = end + 1; continue;
+                }
+            }
+
+            plain.Append(c);
+            i++;
+        }
+
+        Flush();
+    }
+
+    /// <summary>Safe one-character lookahead. Returns '\0' past end-of-string.</summary>
+    private static char Peek(string text, int index) => index < text.Length ? text[index] : '\0';
+
+    /// <summary>
+    /// Finds the next single occurrence of marker that is NOT immediately followed by
+    /// another marker. Used to disambiguate "*italic*" from "**bold**".
+    /// </summary>
+    private static int FindClosingSingle(string text, char marker, int start)
+    {
+        for (int i = start; i < text.Length; i++)
+            if (text[i] == marker && Peek(text, i + 1) != marker)
+                return i;
+        return -1;
+    }
+}

RelayClient/Helpers/SyntaxHighlighter.cs

@@ -0,0 +1,361 @@
+using System.Text.RegularExpressions;
+
+namespace RelayClient.Helpers;
+
+/// <summary>
+/// Discord-style syntax highlighting for ```lang...``` fenced code blocks. Builds a list of
+/// MAUI Spans (with colors from the VS Code Dark+ palette) that the caller drops into a
+/// FormattedString.
+///
+/// How it works:
+///   - The opening fence captures an optional language tag (e.g. ```cs, ```python).
+///   - Aliases resolves "cs" → "csharp", "js" → "javascript", etc.
+///   - Tokenizers[lang] is a compiled regex with named groups (comment/string/number/word/…).
+///   - For each match, SpanForMatch picks a colour based on which group matched + whether
+///     a "word" hit a language keyword set.
+///
+/// Adding a new language: register an alias (if needed), a Keywords set, and a tokenizer regex.
+/// </summary>
+public static class SyntaxHighlighter
+{
+    /// <summary>Fallback identifier color (light grey). Used for any token we don't recognise.</summary>
+    private static readonly Color DefaultColor  = Color.FromArgb("#D4D4D4");
+    /// <summary>Language keywords (if, for, return, etc.) — VS Code's "control flow" blue.</summary>
+    private static readonly Color KeywordColor  = Color.FromArgb("#569CD6");
+    /// <summary>String literals — orange/salmon.</summary>
+    private static readonly Color StringColor   = Color.FromArgb("#CE9178");
+    /// <summary>Numeric literals — soft green.</summary>
+    private static readonly Color NumberColor   = Color.FromArgb("#B5CEA8");
+    /// <summary>Comments — green, rendered italic.</summary>
+    private static readonly Color CommentColor  = Color.FromArgb("#6A9955");
+    /// <summary>Type names (heuristic: uppercase-start words in C#/JS/TS) — teal.</summary>
+    private static readonly Color TypeColor     = Color.FromArgb("#4EC9B0");
+    /// <summary>Function names — yellow. Currently unused (we don't disambiguate function calls).</summary>
+    private static readonly Color FunctionColor = Color.FromArgb("#DCDCAA");
+    /// <summary>Operators — same as default. Reserved for future use.</summary>
+    private static readonly Color OperatorColor = Color.FromArgb("#D4D4D4");
+    /// <summary>HTML tag names (&lt;div&gt;, &lt;/p&gt;) — blue.</summary>
+    private static readonly Color TagColor      = Color.FromArgb("#569CD6");
+    /// <summary>HTML/CSS attribute names, YAML keys, bash variables — light blue.</summary>
+    private static readonly Color AttrColor     = Color.FromArgb("#9CDCFE");
+
+    /// <summary>Monospace font registered in MauiProgram. Used for all code-block spans.</summary>
+    private const string FontFamily = "AnonymousProRegular";
+
+    /// <summary>
+    /// Short language tags → canonical names. So users can write ```cs (instead of ```csharp),
+    /// ```py instead of ```python, etc. Case-insensitive.
+    /// </summary>
+    private static readonly Dictionary<string, string> Aliases = new(StringComparer.OrdinalIgnoreCase)
+    {
+        ["cs"] = "csharp",
+        ["c#"] = "csharp",
+        ["js"] = "javascript",
+        ["jsx"] = "javascript",
+        ["ts"] = "typescript",
+        ["tsx"] = "typescript",
+        ["py"] = "python",
+        ["sh"] = "bash",
+        ["shell"] = "bash",
+        ["zsh"] = "bash",
+        ["htm"] = "html",
+        ["xml"] = "html",
+        ["yml"] = "yaml"
+    };
+
+    /// <summary>
+    /// Per-language keyword sets. A token in a "word" match-group that hits one of these
+    /// gets rendered with KeywordColor. Case-sensitivity matches the language — Ordinal
+    /// for most languages, OrdinalIgnoreCase for SQL and CSS.
+    /// </summary>
+    private static readonly Dictionary<string, HashSet<string>> Keywords = new(StringComparer.OrdinalIgnoreCase)
+    {
+        ["csharp"] = new(StringComparer.Ordinal)
+        {
+            "abstract","as","async","await","base","bool","break","byte","case","catch","char","checked",
+            "class","const","continue","decimal","default","delegate","do","double","else","enum","event",
+            "explicit","extern","false","finally","fixed","float","for","foreach","get","goto","if",
+            "implicit","in","int","interface","internal","is","lock","long","namespace","new","null",
+            "object","operator","out","override","params","partial","private","protected","public",
+            "readonly","record","ref","return","sbyte","sealed","set","short","sizeof","stackalloc",
+            "static","string","struct","switch","this","throw","true","try","typeof","uint","ulong",
+            "unchecked","unsafe","ushort","using","var","virtual","void","volatile","while","yield",
+            "nameof","when","where","global","init","required","file","scoped","with"
+        },
+        ["javascript"] = new(StringComparer.Ordinal)
+        {
+            "async","await","break","case","catch","class","const","continue","debugger","default",
+            "delete","do","else","enum","export","extends","false","finally","for","from","function",
+            "get","if","implements","import","in","instanceof","let","new","null","of","package",
+            "private","protected","public","return","set","static","super","switch","this","throw",
+            "true","try","typeof","undefined","var","void","while","with","yield"
+        },
+        ["typescript"] = new(StringComparer.Ordinal)
+        {
+            "any","as","async","await","boolean","break","case","catch","class","const","continue",
+            "debugger","declare","default","delete","do","else","enum","export","extends","false",
+            "finally","for","from","function","get","if","implements","import","in","instanceof",
+            "interface","is","keyof","let","namespace","never","new","null","number","of","package",
+            "private","protected","public","readonly","return","set","static","string","super",
+            "switch","this","throw","true","try","type","typeof","undefined","unknown","var","void",
+            "while","with","yield"
+        },
+        ["python"] = new(StringComparer.Ordinal)
+        {
+            "and","as","assert","async","await","break","class","continue","def","del","elif","else",
+            "except","False","finally","for","from","global","if","import","in","is","lambda","None",
+            "nonlocal","not","or","pass","raise","return","True","try","while","with","yield","self",
+            "cls","match","case"
+        },
+        ["sql"] = new(StringComparer.OrdinalIgnoreCase)
+        {
+            "select","from","where","insert","update","delete","create","alter","drop","table","index",
+            "view","join","inner","outer","left","right","full","cross","on","as","group","by","order",
+            "having","distinct","union","all","into","values","set","null","not","and","or","in","like",
+            "between","is","true","false","primary","key","foreign","references","default","limit",
+            "offset","with","case","when","then","else","end","exists","cast","begin","commit","rollback"
+        },
+        ["bash"] = new(StringComparer.Ordinal)
+        {
+            "if","then","else","elif","fi","for","in","do","done","while","until","case","esac",
+            "function","return","break","continue","exit","echo","printf","export","local","readonly",
+            "source","alias","unset","trap","set","eval","exec","shift","let","declare","typeset"
+        },
+        ["json"] = new(StringComparer.Ordinal) { "true","false","null" },
+        ["yaml"] = new(StringComparer.Ordinal) { "true","false","null","yes","no","on","off" },
+        ["css"]  = new(StringComparer.OrdinalIgnoreCase)
+        {
+            "important","inherit","initial","unset","auto","none","normal","bold","italic","center",
+            "left","right","top","bottom","flex","grid","block","inline","absolute","relative","fixed",
+            "sticky","static"
+        }
+    };
+
+    /// <summary>
+    /// Per-language compiled token regex. Each pattern uses named groups (comment/string/
+    /// number/word/tag/attr/…) which SpanForMatch dispatches on. Initialised lazily in the
+    /// static constructor so the heavy regex compilation is paid once at startup.
+    /// </summary>
+    private static readonly Dictionary<string, Regex> Tokenizers = new(StringComparer.Ordinal);
+
+    static SyntaxHighlighter()
+    {
+        const RegexOptions opts = RegexOptions.Compiled | RegexOptions.Singleline;
+
+        Tokenizers["csharp"] = new Regex(
+            @"(?<comment>//[^\n]*|/\*.*?\*/)" +
+            @"|(?<string>@""(?:""""|[^""])*""|\$""(?:\\.|[^""\\])*""|""(?:\\.|[^""\\])*""|'(?:\\.|[^'\\])*')" +
+            @"|(?<number>\b\d+(?:\.\d+)?[fFdDmMuUlL]*\b)" +
+            @"|(?<word>[A-Za-z_]\w*)",
+            opts);
+
+        Tokenizers["javascript"] = new Regex(
+            @"(?<comment>//[^\n]*|/\*.*?\*/)" +
+            @"|(?<string>""(?:\\.|[^""\\])*""|'(?:\\.|[^'\\])*'|`(?:\\.|[^`\\])*`)" +
+            @"|(?<number>\b\d+(?:\.\d+)?\b)" +
+            @"|(?<word>[A-Za-z_$][\w$]*)",
+            opts);
+
+        Tokenizers["typescript"] = Tokenizers["javascript"];
+
+        Tokenizers["python"] = new Regex(
+            @"(?<comment>\#[^\n]*)" +
+            @"|(?<string>""""""[\s\S]*?""""""|'''[\s\S]*?'''|""(?:\\.|[^""\\])*""|'(?:\\.|[^'\\])*')" +
+            @"|(?<number>\b\d+(?:\.\d+)?\b)" +
+            @"|(?<word>[A-Za-z_]\w*)",
+            opts);
+
+        Tokenizers["sql"] = new Regex(
+            @"(?<comment>--[^\n]*|/\*.*?\*/)" +
+            @"|(?<string>'(?:''|[^'])*')" +
+            @"|(?<number>\b\d+(?:\.\d+)?\b)" +
+            @"|(?<word>[A-Za-z_]\w*)",
+            opts);
+
+        Tokenizers["bash"] = new Regex(
+            @"(?<comment>\#[^\n]*)" +
+            @"|(?<string>""(?:\\.|[^""\\])*""|'[^']*')" +
+            @"|(?<number>\b\d+\b)" +
+            @"|(?<variable>\$\{?[A-Za-z_]\w*\}?)" +
+            @"|(?<word>[A-Za-z_][\w-]*)",
+            opts);
+
+        Tokenizers["json"] = new Regex(
+            @"(?<string>""(?:\\.|[^""\\])*"")" +
+            @"|(?<number>-?\b\d+(?:\.\d+)?(?:[eE][+-]?\d+)?\b)" +
+            @"|(?<word>true|false|null)",
+            opts);
+
+        Tokenizers["yaml"] = new Regex(
+            @"(?<comment>\#[^\n]*)" +
+            @"|(?<string>""(?:\\.|[^""\\])*""|'[^']*')" +
+            @"|(?<key>^[ \t]*[A-Za-z_][\w-]*(?=\s*:))" +
+            @"|(?<number>\b\d+(?:\.\d+)?\b)" +
+            @"|(?<word>[A-Za-z_][\w-]*)",
+            opts | RegexOptions.Multiline);
+
+        Tokenizers["html"] = new Regex(
+            @"(?<comment><!--.*?-->)" +
+            @"|(?<string>""[^""]*""|'[^']*')" +
+            @"|(?<tag></?[A-Za-z][A-Za-z0-9-]*)" +
+            @"|(?<attr>\b[A-Za-z_][\w-]*(?==))",
+            opts);
+
+        Tokenizers["css"] = new Regex(
+            @"(?<comment>/\*.*?\*/)" +
+            @"|(?<string>""[^""]*""|'[^']*')" +
+            @"|(?<number>-?\b\d+(?:\.\d+)?(?:px|em|rem|%|vh|vw|s|ms|deg)?\b)" +
+            @"|(?<selector>[.#]?[A-Za-z_][\w-]*(?=\s*[{,]))" +
+            @"|(?<prop>[A-Za-z-]+(?=\s*:))" +
+            @"|(?<word>[A-Za-z_][\w-]*)",
+            opts);
+
+        Tokenizers["diff"] = new Regex(
+            @"(?<add>^\+[^\n]*)" +
+            @"|(?<del>^-[^\n]*)" +
+            @"|(?<hunk>^@@[^\n]*)",
+            opts | RegexOptions.Multiline);
+
+        Tokenizers["markdown"] = new Regex(
+            @"(?<header>^#{1,6}[^\n]*)" +
+            @"|(?<bold>\*\*[^*\n]+\*\*|__[^_\n]+__)" +
+            @"|(?<italic>\*[^*\n]+\*|_[^_\n]+_)" +
+            @"|(?<code>`[^`\n]+`)" +
+            @"|(?<link>\[[^\]]+\]\([^)]+\))",
+            opts | RegexOptions.Multiline);
+    }
+
+    /// <summary>
+    /// Entry point. Walks every regex match in the code, emits plain spans for the gaps and
+    /// styled spans for the matches. If the language is unknown (or not specified), returns a
+    /// single default-colored span — code still renders in the monospace font, just no colors.
+    /// </summary>
+    public static List<Span> Highlight(string code, string? language, double fontSize)
+    {
+        var lang = Resolve(language);
+        var spans = new List<Span>();
+
+        if (lang is null || !Tokenizers.TryGetValue(lang, out var tokenizer))
+        {
+            spans.Add(MakeSpan(code, DefaultColor, fontSize));
+            return spans;
+        }
+
+        var keywords = Keywords.GetValueOrDefault(lang);
+        int cursor = 0;
+
+        foreach (Match m in tokenizer.Matches(code))
+        {
+            if (m.Index > cursor)
+                spans.Add(MakeSpan(code[cursor..m.Index], DefaultColor, fontSize));
+
+            spans.Add(SpanForMatch(m, lang, keywords, fontSize));
+            cursor = m.Index + m.Length;
+        }
+
+        if (cursor < code.Length)
+            spans.Add(MakeSpan(code[cursor..], DefaultColor, fontSize));
+
+        return spans;
+    }
+
+    /// <summary>
+    /// Maps a regex Match to a colored Span by inspecting which named group succeeded. Words
+    /// fall through to a keyword-set lookup; in C#/JS/TS, uppercase-start words that aren't
+    /// keywords are treated as type names (a cheap heuristic that works surprisingly well).
+    /// </summary>
+    private static Span SpanForMatch(Match m, string lang, HashSet<string>? keywords, double fontSize)
+    {
+        if (m.Groups["comment"].Success)
+            return MakeSpan(m.Value, CommentColor, fontSize, italic: true);
+
+        if (m.Groups["string"].Success)
+            return MakeSpan(m.Value, StringColor, fontSize);
+
+        if (m.Groups["number"].Success)
+            return MakeSpan(m.Value, NumberColor, fontSize);
+
+        if (m.Groups["variable"].Success)
+            return MakeSpan(m.Value, AttrColor, fontSize);
+
+        if (m.Groups["tag"].Success)
+            return MakeSpan(m.Value, TagColor, fontSize);
+
+        if (m.Groups["attr"].Success)
+            return MakeSpan(m.Value, AttrColor, fontSize);
+
+        if (m.Groups["selector"].Success)
+            return MakeSpan(m.Value, TypeColor, fontSize);
+
+        if (m.Groups["prop"].Success)
+            return MakeSpan(m.Value, AttrColor, fontSize);
+
+        if (m.Groups["key"].Success)
+            return MakeSpan(m.Value, AttrColor, fontSize);
+
+        if (m.Groups["add"].Success)
+            return MakeSpan(m.Value, Color.FromArgb("#6A9955"), fontSize);
+
+        if (m.Groups["del"].Success)
+            return MakeSpan(m.Value, Color.FromArgb("#F48771"), fontSize);
+
+        if (m.Groups["hunk"].Success)
+            return MakeSpan(m.Value, KeywordColor, fontSize);
+
+        if (m.Groups["header"].Success)
+            return MakeSpan(m.Value, KeywordColor, fontSize, bold: true);
+
+        if (m.Groups["bold"].Success)
+            return MakeSpan(m.Value, DefaultColor, fontSize, bold: true);
+
+        if (m.Groups["italic"].Success)
+            return MakeSpan(m.Value, DefaultColor, fontSize, italic: true);
+
+        if (m.Groups["code"].Success)
+            return MakeSpan(m.Value, StringColor, fontSize);
+
+        if (m.Groups["link"].Success)
+            return MakeSpan(m.Value, AttrColor, fontSize);
+
+        if (m.Groups["word"].Success)
+        {
+            var word = m.Value;
+            var compareSet = keywords;
+
+            if (compareSet is not null && compareSet.Contains(word))
+                return MakeSpan(word, KeywordColor, fontSize);
+
+            if (lang is "csharp" or "javascript" or "typescript" && word.Length > 0 && char.IsUpper(word[0]))
+                return MakeSpan(word, TypeColor, fontSize);
+
+            return MakeSpan(word, DefaultColor, fontSize);
+        }
+
+        return MakeSpan(m.Value, DefaultColor, fontSize);
+    }
+
+    /// <summary>Helper: build a Span with the monospace code font and the given colour + bold/italic flags.</summary>
+    private static Span MakeSpan(string text, Color color, double fontSize, bool bold = false, bool italic = false)
+    {
+        var attrs = FontAttributes.None;
+        if (bold)   attrs |= FontAttributes.Bold;
+        if (italic) attrs |= FontAttributes.Italic;
+
+        return new Span
+        {
+            Text           = text,
+            TextColor      = color,
+            FontSize       = fontSize,
+            FontFamily     = FontFamily,
+            FontAttributes = attrs
+        };
+    }
+
+    /// <summary>Normalises a user-supplied language tag through the Aliases table. Returns null for empty/whitespace input.</summary>
+    private static string? Resolve(string? language)
+    {
+        if (string.IsNullOrWhiteSpace(language)) return null;
+        var lower = language.Trim().ToLowerInvariant();
+        return Aliases.GetValueOrDefault(lower, lower);
+    }
+}

RelayClient/MainPage.xaml

@@ -1,36 +1,99 @@
-<?xml version="1.0" encoding="utf-8" ?>
+<?xml version="1.0" encoding="utf-8" ?>
-<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+<ContentPage
-             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    x:Class="RelayClient.MainPage"
-             x:Class="RelayClient.MainPage">
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    Title="Relay Client">
 
-    <ScrollView>
+    <Grid RowDefinitions="Auto,*,Auto"
-        <VerticalStackLayout
+          ColumnDefinitions="220,*"
-            Padding="30,0"
+          Padding="12"
-            Spacing="25">
+          RowSpacing="10"
-            <Image
+          ColumnSpacing="10">
-                Source="dotnet_bot.png"
-                HeightRequest="185"
-                Aspect="AspectFit"
-                SemanticProperties.Description="dot net bot in a submarine number ten" />
 
-            <Label
+        <!-- Header -->
-                Text="Hello, World!"
+        <Border Grid.Row="0" Grid.ColumnSpan="2" StrokeThickness="1" Padding="10">
-                Style="{StaticResource Headline}"
+            <VerticalStackLayout Spacing="2">
-                SemanticProperties.HeadingLevel="Level1" />
+                <Label x:Name="UserLabel" Text="Logged in as: Unknown"
+                       FontAttributes="Bold" FontSize="18" />
+                <Label x:Name="ChannelLabel" Text="No channel selected" FontSize="14" />
+                <Label x:Name="TypingLabel" Text="" FontSize="11"
+                       FontAttributes="Italic" TextColor="Gray" IsVisible="False" />
+            </VerticalStackLayout>
+        </Border>
 
-            <Label
+        <!-- Sidebar: channel list -->
-                Text="Welcome to &#10;.NET Multi-platform App UI"
+        <Border Grid.Row="1" Grid.Column="0" StrokeThickness="1" Padding="10">
-                Style="{StaticResource SubHeadline}"
+            <ScrollView>
-                SemanticProperties.HeadingLevel="Level2"
+                <VerticalStackLayout Spacing="8">
-                SemanticProperties.Description="Welcome to dot net Multi platform App U I" />
+                    <Grid ColumnDefinitions="*,Auto">
+                        <Label Grid.Column="0" Text="Channels"
+                               FontAttributes="Bold" FontSize="16"
+                               VerticalOptions="Center" />
+                        <Button Grid.Column="1" Text="+"
+                                FontSize="16" Padding="6,2"
+                                HeightRequest="30" WidthRequest="30"
+                                Clicked="AddChannel_OnClicked" />
+                    </Grid>
+                    <VerticalStackLayout x:Name="SidebarList" Spacing="4" />
+                </VerticalStackLayout>
+            </ScrollView>
+        </Border>
+
+        <!-- Messages view (text channels) -->
+        <Border x:Name="MessagesView" Grid.Row="1" Grid.Column="1" StrokeThickness="1" Padding="10">
+            <ScrollView x:Name="MessagesScrollView">
+                <VerticalStackLayout x:Name="MessagesLayout" Spacing="8" />
+            </ScrollView>
+        </Border>
+
+        <!-- RTC view (voice channels) -->
+        <Border x:Name="RtcView" Grid.Row="1" Grid.Column="1"
+                StrokeThickness="1" Padding="10" IsVisible="False">
+            <Grid RowDefinitions="Auto,*">
+                <HybridWebView x:Name="hybridWebView"
+                               RawMessageReceived="OnHybridWebViewRawMessageReceived"
+                               Grid.Row="1" />
+            </Grid>
+        </Border>
+
+        <!-- Input area -->
+        <VerticalStackLayout x:Name="InputArea" Grid.Row="2" Grid.Column="1" Spacing="4">
+
+            <!-- Context bar (reply / edit mode) -->
+            <Border x:Name="ContextBar" IsVisible="False" StrokeThickness="1" Padding="8,4">
+                <Grid ColumnDefinitions="*,Auto" ColumnSpacing="8">
+                    <Label x:Name="ContextBarLabel" Grid.Column="0"
+                           VerticalOptions="Center" FontSize="12"
+                           LineBreakMode="TailTruncation" />
+                    <Button Grid.Column="1" Text="✕" FontSize="11"
+                            Padding="6,2" HeightRequest="30"
+                            Clicked="CancelContext_OnClicked" />
+                </Grid>
+            </Border>
+
+            <!-- Entry row: attach button + editor + send -->
+            <Grid ColumnDefinitions="Auto,*,Auto" ColumnSpacing="6">
+                <Button Grid.Column="0" Text="📎"
+                        FontSize="16" Padding="6,2"
+                        HeightRequest="40" WidthRequest="40"
+                        Clicked="AttachFile_OnClicked"
+                        ToolTipProperties.Text="Attach a file or image" />
+                <Editor x:Name="MessageEntry"
+                        Grid.Column="1"
+                        Placeholder="Type a message… (Shift+Enter for newline)"
+                        AutoSize="TextChanges"
+                        MaximumHeightRequest="120"
+                        TextChanged="MessageEntry_OnTextChanged" />
+                <Button x:Name="SendButton" Grid.Column="2"
+                        Text="Send" VerticalOptions="End"
+                        Clicked="SendButton_OnClicked" />
+            </Grid>
 
-            <Button
-                x:Name="CounterBtn"
-                Text="Click me" 
-                SemanticProperties.Hint="Counts the number of times you click"
-                Clicked="OnCounterClicked"
-                HorizontalOptions="Fill" />
         </VerticalStackLayout>
-    </ScrollView>
 
+        <!-- Bottom-left: kept empty (swap button removed) -->
+        <ContentView Grid.Row="2" Grid.Column="0" />
+
+    </Grid>
 </ContentPage>

RelayClient/MauiProgram.cs

@@ -1,5 +1,5 @@
 using Microsoft.Extensions.Logging;
-using Microsoft.Maui.Hosting;
+using WebSocketSharp;
 
 namespace RelayClient;
 
@@ -8,16 +8,17 @@ public static class MauiProgram
     public static MauiApp CreateMauiApp()
     {
         var builder = MauiApp.CreateBuilder();
-        builder
+        builder.UseMauiApp<App>().ConfigureFonts(fonts =>
-            .UseMauiApp<App>()
-            .ConfigureFonts(fonts =>
             {
-                fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
+                fonts.AddFont("AnonymousPro-Bold.ttf", "AnonymousProBold");
-                fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
+                fonts.AddFont("AnonymousPro-BoldItalic.ttf", "AnonymousProBoldItalic");
+                fonts.AddFont("AnonymousPro-Italic.ttf", "AnonymousProItalic");
+                fonts.AddFont("AnonymousPro-Regular.ttf", "AnonymousProRegular");
             });
 
 #if DEBUG
-        builder.Logging.AddDebug();
+        builder.Services.AddHybridWebViewDeveloperTools();
+        builder.Logging.AddDebug(); 
 #endif
 
         return builder.Build();

RelayClient/RelayClient.csproj

@@ -36,11 +36,26 @@
         <MauiImage Update="Resources\Images\dotnet_bot.png" Resize="True" BaseSize="300,185" />
         <MauiFont Include="Resources\Fonts\*" />
         <MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
+        <None Remove="Resources\Raw\test.html" />
+        <MauiAsset Include="Resources\Raw\test.html">
+          <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </MauiAsset>
     </ItemGroup>
 
     <ItemGroup>
+        <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="11.0.0-preview.2.26159.112" />
         <PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
         <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="10.0.0" />
+        <PackageReference Include="SurrealDb.Net" Version="0.9.0" />
+        <PackageReference Include="WebSocketSharp" Version="1.0.3-rc11" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\RelayShared\RelayShared.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <Folder Include="Models\" />
     </ItemGroup>
 
 </Project>

RelayClient/Resources/AppIcon/appicon.svg

@@ -1,4 +1 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg id="New_Version" data-name="New Version" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 759.23 759.23"><defs><style>.cls-1{fill:#2e3338;}</style></defs><path id="Background" class="cls-1" d="M177.77,0H581.46A177.77,177.77,0,0,1,759.23,177.77V581.46A177.77,177.77,0,0,1,581.46,759.23H177.77A177.77,177.77,0,0,1,0,581.46V177.77A177.77,177.77,0,0,1,177.77,0Z"/></svg>
-<svg width="456" height="456" viewBox="0 0 456 456" version="1.1" xmlns="http://www.w3.org/2000/svg">
-    <rect x="0" y="0" width="456" height="456" fill="#512BD4" />
-</svg>

RelayClient/Resources/AppIcon/old_appicon.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg width="456" height="456" viewBox="0 0 456 456" version="1.1" xmlns="http://www.w3.org/2000/svg">
+    <rect x="0" y="0" width="456" height="456" fill="#512BD4" />
+</svg>

RelayClient/Resources/AppIcon/old_appiconfg.svg

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg width="456" height="456" viewBox="0 0 456 456" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" xmlns:serif="http://www.serif.com/" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:2;">
+    <path d="m 105.50037,281.60863 c -2.70293,0 -5.00091,-0.90042 -6.893127,-2.70209 -1.892214,-1.84778 -2.837901,-4.04181 -2.837901,-6.58209 0,-2.58722 0.945687,-4.80389 2.837901,-6.65167 1.892217,-1.84778 4.190197,-2.77167 6.893127,-2.77167 2.74819,0 5.06798,0.92389 6.96019,2.77167 1.93749,1.84778 2.90581,4.06445 2.90581,6.65167 0,2.54028 -0.96832,4.73431 -2.90581,6.58209 -1.89221,1.80167 -4.212,2.70209 -6.96019,2.70209 z" style="fill:#ffffff;fill-rule:nonzero;stroke-width:0.838376" />
+    <path d="M 213.56111,280.08446 H 195.99044 L 149.69953,207.0544 c -1.17121,-1.84778 -2.14037,-3.76515 -2.90581,-5.75126 h -0.40578 c 0.36051,2.12528 0.54076,6.67515 0.54076,13.6496 v 65.13172 h -15.54349 v -99.36009 h 18.71925 l 44.7374,71.29798 c 1.89222,2.95695 3.1087,4.98917 3.64945,6.09751 h 0.26996 c -0.45021,-2.6325 -0.67573,-7.09015 -0.67573,-13.37293 v -64.02256 h 15.47557 z" style="fill:#ffffff;fill-rule:nonzero;stroke-width:0.838376" />
+    <path d="m 289.25134,280.08446 h -54.40052 v -99.36009 h 52.23835 v 13.99669 h -36.15411 v 28.13085 h 33.31621 v 13.9271 h -33.31621 v 29.37835 h 38.31628 z" style="fill:#ffffff;fill-rule:nonzero;stroke-width:0.838376" />
+    <path d="M 366.56466,194.72106 H 338.7222 v 85.3634 h -16.08423 v -85.3634 h -27.77455 v -13.99669 h 71.70124 z" style="fill:#ffffff;fill-rule:nonzero;stroke-width:0.838376" />
+</svg>

RelayClient/Resources/Raw/test.css

@@ -0,0 +1,24 @@
+@import url('https://fonts.googleapis.com/css2?family=Anonymous+Pro');
+
+body {
+  font-family: 'Anonymous Pro', monospace;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+  text-align: center;
+  color: #2c3e50;
+  margin: 80px 10px;
+  background-color: #666666;
+}
+
+video {
+  width: 40vw;
+  height: 30vw;
+  margin: 2rem;
+  background: #2c3e50;
+}
+
+.videos {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}

RelayClient/Resources/Raw/test.html

@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="favicon.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>WebRTC Demo</title>
+  </head>
+  <body>
+    <h2>1. Start your Webcam</h2>
+    <div class="videos">
+      <span>
+        <h3>Local Stream</h3>
+        <video id="webcamVideo" autoplay playsinline></video>
+      </span>
+      <span>
+        <h3>Remote Stream</h3>
+        <video id="remoteVideo" autoplay playsinline></video>
+      </span>
+
+
+    </div>
+
+    <button id="webcamButton">Start webcam</button>
+    <h2>2. Create a new Call</h2>
+    <button id="callButton" disabled>Create Call (offer)</button>
+
+    <h2>3. Join a Call</h2>
+    <p>Answer the call from a different browser window or device</p>
+    
+    <input id="callInput" />
+    <button id="answerButton" disabled>Answer</button>
+
+    <h2>4. Hangup</h2>
+
+    <button id="hangupButton" disabled>Hangup</button>
+
+    <script type="module" src="test.js"></script>
+
+  </body>
+</html>

RelayClient/Resources/Raw/test.js

@@ -0,0 +1,146 @@
+import './test.css';
+
+import firebase from 'firebase/app';
+import 'firebase/firestore';
+
+const firebaseConfig = {
+  // your config
+};
+
+if (!firebase.apps.length) {
+  firebase.initializeApp(firebaseConfig);
+}
+const firestore = firebase.firestore();
+
+const servers = {
+  iceServers: [
+    {
+      urls: ['stun:stun1.l.google.com:19302', 'stun:stun2.l.google.com:19302'],
+    },
+  ],
+  iceCandidatePoolSize: 10,
+};
+
+// Global State
+const pc = new RTCPeerConnection(servers);
+let localStream = null;
+let remoteStream = null;
+
+// HTML elements
+const webcamButton = document.getElementById('webcamButton');
+const webcamVideo = document.getElementById('webcamVideo');
+const callButton = document.getElementById('callButton');
+const callInput = document.getElementById('callInput');
+const answerButton = document.getElementById('answerButton');
+const remoteVideo = document.getElementById('remoteVideo');
+const hangupButton = document.getElementById('hangupButton');
+
+// 1. Setup media sources
+
+webcamButton.onclick = async () => {
+  localStream = await navigator.mediaDevices.getUserMedia({ video: true, audio: true });
+  remoteStream = new MediaStream();
+
+  // Push tracks from local stream to peer connection
+  localStream.getTracks().forEach((track) => {
+    pc.addTrack(track, localStream);
+  });
+
+  // Pull tracks from remote stream, add to video stream
+  pc.ontrack = (event) => {
+    event.streams[0].getTracks().forEach((track) => {
+      remoteStream.addTrack(track);
+    });
+  };
+
+  webcamVideo.srcObject = localStream;
+  remoteVideo.srcObject = remoteStream;
+
+  callButton.disabled = false;
+  answerButton.disabled = false;
+  webcamButton.disabled = true;
+};
+
+// 2. Create an offer
+callButton.onclick = async () => {
+  // Reference Firestore collections for signaling
+  const callDoc = firestore.collection('calls').doc();
+  const offerCandidates = callDoc.collection('offerCandidates');
+  const answerCandidates = callDoc.collection('answerCandidates');
+
+  callInput.value = callDoc.id;
+
+  // Get candidates for caller, save to db
+  pc.onicecandidate = (event) => {
+    event.candidate && offerCandidates.add(event.candidate.toJSON());
+  };
+
+  // Create offer
+  const offerDescription = await pc.createOffer();
+  await pc.setLocalDescription(offerDescription);
+
+  const offer = {
+    sdp: offerDescription.sdp,
+    type: offerDescription.type,
+  };
+
+  await callDoc.set({ offer });
+
+  // Listen for remote answer
+  callDoc.onSnapshot((snapshot) => {
+    const data = snapshot.data();
+    if (!pc.currentRemoteDescription && data?.answer) {
+      const answerDescription = new RTCSessionDescription(data.answer);
+      pc.setRemoteDescription(answerDescription);
+    }
+  });
+
+  // When answered, add candidate to peer connection
+  answerCandidates.onSnapshot((snapshot) => {
+    snapshot.docChanges().forEach((change) => {
+      if (change.type === 'added') {
+        const candidate = new RTCIceCandidate(change.doc.data());
+        pc.addIceCandidate(candidate);
+      }
+    });
+  });
+
+  hangupButton.disabled = false;
+};
+
+// 3. Answer the call with the unique ID
+answerButton.onclick = async () => {
+  const callId = callInput.value;
+  const callDoc = firestore.collection('calls').doc(callId);
+  const answerCandidates = callDoc.collection('answerCandidates');
+  const offerCandidates = callDoc.collection('offerCandidates');
+
+  pc.onicecandidate = (event) => {
+    event.candidate && answerCandidates.add(event.candidate.toJSON());
+  };
+
+  const callData = (await callDoc.get()).data();
+
+  const offerDescription = callData.offer;
+  await pc.setRemoteDescription(new RTCSessionDescription(offerDescription));
+
+  const answerDescription = await pc.createAnswer();
+  await pc.setLocalDescription(answerDescription);
+
+  const answer = {
+    type: answerDescription.type,
+    sdp: answerDescription.sdp,
+  };
+
+  await callDoc.update({ answer });
+
+  offerCandidates.onSnapshot((snapshot) => {
+    snapshot.docChanges().forEach((change) => {
+      console.log(change);
+      if (change.type === 'added') {
+        let data = change.doc.data();
+        pc.addIceCandidate(new RTCIceCandidate(data));
+      }
+    });
+  });
+};

RelayClient/Resources/Raw/wwwroot/index.css

@@ -0,0 +1,114 @@
+body {
+    margin: 0;
+    padding: 16px;
+    background-color: #121212;
+    color: #FFFFFF;
+    font-family: "Segoe UI", Arial, sans-serif;
+}
+
+h3 {
+    margin: 0 0 10px 0;
+    color: #FFA9D1F4;
+}
+
+button {
+    background-color: #332940;
+    color: #FFFFFF;
+    border: none;
+    padding: 8px 12px;
+    margin-right: 6px;
+    border-radius: 6px;
+    cursor: pointer;
+    transition: background 0.2s ease, transform 0.05s ease;
+}
+
+button:hover {
+    background-color: #40324f;
+}
+
+button:active {
+    transform: scale(0.97);
+}
+
+select {
+    background-color: #332940;
+    color: #FFFFFF;
+    border: none;
+    padding: 6px;
+    border-radius: 6px;
+    margin-left: 4px;
+}
+
+label {
+    font-size: 14px;
+}
+
+video {
+    border-radius: 8px;
+    border: 1px solid #332940;
+    background-color: #1F1A24;
+}
+
+#localVideoStatus,
+#remoteVideoStatus,
+#localMediaStatus,
+#remoteMediaStatus {
+    font-size: 12px;
+    margin-top: 4px;
+    color: #FFA9D1F4;
+}
+
+textarea {
+    background-color: #1F1A24;
+    color: #FFFFFF;
+    border: 1px solid #332940;
+    border-radius: 8px;
+    padding: 8px;
+    font-family: monospace;
+    resize: none;
+}
+
+div {
+    margin-bottom: 6px;
+}
+
+textarea::-webkit-scrollbar {
+    width: 8px;
+}
+
+textarea::-webkit-scrollbar-thumb {
+    background: #332940;
+    border-radius: 4px;
+}
+
+.panel {
+    background: #1F1A24;
+    border: 1px solid #332940;
+    border-radius: 10px;
+    padding: 12px;
+}
+
+.remote-media-container {
+    display: flex;
+    flex-direction: row;
+    gap: 16px;
+    align-items: flex-start;
+    flex-wrap: nowrap;
+    overflow-x: auto;
+    padding: 8px 0;
+}
+
+.remote-media-tile,
+.remote-tile {
+    flex: 0 0 auto;
+    width: 320px;
+}
+
+.remote-media-tile video,
+.remote-tile video {
+    width: 320px;
+    height: 240px;
+    background: #111;
+    border-radius: 8px;
+    object-fit: cover;
+}

RelayClient/Resources/Raw/wwwroot/index.html

@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+
+<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
+<head>
+    <meta charset="utf-8" />
+    <title></title>
+    <link rel="icon" href="data:,">
+    <link rel="stylesheet" href="styles/app.css">
+    <link rel="stylesheet" href="index.css">
+    <script src="_framework/hybridwebview.js"></script>
+    <script src="media.js"></script>
+    <script src="relaySocket.js"></script>
+    <script src="rtc.js"></script>
+    <script src="index.js"></script>
+</head>
+    <body>
+        <div>
+            <h3>Relay RTC Test</h3>
+        </div>
+
+        <div>
+            <button onclick="Media.refreshDevicesAndPreview()">Refresh Devices</button>
+            <button onclick="RelayRtc.joinChannelCall()">Join Call</button>
+        </div>
+
+        <div style="margin-top: 8px;">
+            <label for="cameraSelect">Camera:</label>
+            <select id="cameraSelect"></select>
+
+            <label for="micSelect" style="margin-left: 12px;">Microphone:</label>
+            <select id="micSelect"></select>
+        </div>
+
+        <div style="margin-top: 10px;">
+            <div style="display: inline-block; margin-right: 20px; vertical-align: top;">
+                <video id="localVideo" autoplay playsinline muted style="width: 320px; height: 240px; background: #111;"></video>
+                <div id="localVideoStatus">Local video: waiting...</div>
+                <div id="localMediaStatus">Waiting for local media...</div>
+            </div>
+
+            <div id="remoteMediaContainer" class="remote-media-container"></div>
+        </div>
+        
+        <div style="margin-top: 10px;">
+            <textarea readonly id="messageLog" style="width: 90%; height: 12em;"></textarea>
+        </div>
+    </body>
+</html>

RelayClient/Resources/Raw/wwwroot/index.js

@@ -0,0 +1,73 @@
+let currentUsername = null;
+let currentChannelId = null;
+
+const configuration = {
+    iceServers: [
+        {
+            urls: [
+                "stun:stun1.l.google.com:19302",
+                "stun:stun2.l.google.com:19302"
+            ]
+        }
+    ],
+    iceCandidatePoolSize: 10
+};
+
+window.setUsername = function (name) {
+    currentUsername = name;
+    LogMessage("Username set to: " + currentUsername);
+};
+
+window.setChannelId = function (channelId) {
+    currentChannelId = channelId;
+    LogMessage("Channel set to: " + currentChannelId);
+};
+
+function LogMessage(msg) {
+    const messageLog = document.getElementById("messageLog");
+
+    if (!messageLog) {
+        console.log(msg);
+        return;
+    }
+
+    messageLog.value += "\r\n" + msg;
+    messageLog.scrollTop = messageLog.scrollHeight;
+}
+
+window.LogMessage = LogMessage;
+
+window.addEventListener("HybridWebViewMessageReceived", function (e) {
+    LogMessage("Raw message: " + e.detail.message);
+});
+
+window.addEventListener("load", async () => {
+    LogMessage("RTC page loaded");
+
+    window.HybridWebView.SendRawMessage("rtc_page_ready");
+
+    Media.wireDeviceSelectors();
+    await Media.loadDevices();
+    await Media.ensureLocalMedia();
+});
+
+function testIndex(rawJson)
+{
+    const data = typeof rawJson === "string" ? JSON.parse(rawJson) : rawJson;
+    if (data.sdp) {
+        data.sdp = data.sdp.replaceAll("(rn)", "\r\n");
+    }
+    handleRtcSignal(JSON.stringify(data));
+    // if (data.type === "rtc_offer") {
+    //     handleOffer(data)
+    // }
+    // if (data.type === "rtc_answer") {
+    //     data.sdp = data.sdp.replaceAll("(rn)", "\r\n");
+    //     handleAnswer(data)
+    // }
+}
+
+function noDataTest()
+{
+    LogMessage("No Data Called!!");
+}

RelayClient/Resources/Raw/wwwroot/media.js

@@ -0,0 +1,261 @@
+let localStream = null;
+const remoteStreams = {};
+
+const Media = {
+    async loadDevices() {
+        const devices = await navigator.mediaDevices.enumerateDevices();
+
+        const cameras = devices.filter(d => d.kind === "videoinput");
+        const mics = devices.filter(d => d.kind === "audioinput");
+
+        const cameraSelect = document.getElementById("cameraSelect");
+        const micSelect = document.getElementById("micSelect");
+
+        if (!cameraSelect || !micSelect) return;
+
+        const selectedCamera = cameraSelect.value;
+        const selectedMic = micSelect.value;
+
+        cameraSelect.innerHTML = "";
+        micSelect.innerHTML = "";
+
+        const noCamera = document.createElement("option");
+        noCamera.value = "";
+        noCamera.textContent = "No camera / audio only";
+        cameraSelect.appendChild(noCamera);
+
+        const defaultMic = document.createElement("option");
+        defaultMic.value = "";
+        defaultMic.textContent = "Default microphone";
+        micSelect.appendChild(defaultMic);
+
+        for (const camera of cameras) {
+            const option = document.createElement("option");
+            option.value = camera.deviceId;
+            option.textContent = camera.label || `Camera ${cameraSelect.length}`;
+            cameraSelect.appendChild(option);
+        }
+
+        for (const mic of mics) {
+            const option = document.createElement("option");
+            option.value = mic.deviceId;
+            option.textContent = mic.label || `Microphone ${micSelect.length}`;
+            micSelect.appendChild(option);
+        }
+
+        cameraSelect.value = [...cameraSelect.options].some(o => o.value === selectedCamera)
+            ? selectedCamera
+            : "";
+
+        micSelect.value = [...micSelect.options].some(o => o.value === selectedMic)
+            ? selectedMic
+            : "";
+
+        LogMessage(`Loaded devices: ${cameras.length} cameras, ${mics.length} mics`);
+    },
+
+    async ensureLocalMedia() {
+        const cameraSelect = document.getElementById("cameraSelect");
+        const micSelect = document.getElementById("micSelect");
+
+        if (localStream) {
+            return localStream;
+        }
+
+        const audioDeviceId = micSelect?.value || "";
+        const videoDeviceId = cameraSelect?.value || "";
+
+        const constraints = {
+            audio: audioDeviceId
+                ? { deviceId: { exact: audioDeviceId } }
+                : true,
+            video: videoDeviceId
+                ? { deviceId: { exact: videoDeviceId } }
+                : false
+        };
+
+        try {
+            localStream = await navigator.mediaDevices.getUserMedia(constraints);
+        } catch (err) {
+            LogMessage("Selected media failed: " + err);
+
+            localStream = await navigator.mediaDevices.getUserMedia({
+                audio: audioDeviceId
+                    ? { deviceId: { exact: audioDeviceId } }
+                    : true,
+                video: false
+            });
+
+            LogMessage("No camera available, continuing without video");
+        }
+
+        this.attachLocalStream(localStream);
+        LogMessage("Local media initialized");
+
+        return localStream;
+    },
+
+    attachLocalStream(stream) {
+        const localVideo = document.getElementById("localVideo");
+        const localMediaStatus = document.getElementById("localMediaStatus");
+        const localVideoStatus = document.getElementById("localVideoStatus");
+
+        const audioTracks = stream.getAudioTracks();
+        const videoTracks = stream.getVideoTracks();
+
+        if (localVideo) {
+            localVideo.srcObject = videoTracks.length > 0 ? stream : null;
+        }
+
+        if (localMediaStatus) {
+            localMediaStatus.textContent =
+                audioTracks.length > 0
+                    ? "Microphone active"
+                    : "No microphone";
+        }
+
+        if (localVideoStatus) {
+            localVideoStatus.textContent =
+                videoTracks.length > 0
+                    ? "Local video active"
+                    : "Local video unavailable";
+        }
+    },
+
+    async restartLocalMedia() {
+        if (localStream) {
+            localStream.getTracks().forEach(track => track.stop());
+            localStream = null;
+        }
+
+        await this.ensureLocalMedia();
+
+        if (window.RelayRtc?.applyLocalStreamToAllPeerConnections) {
+            await window.RelayRtc.applyLocalStreamToAllPeerConnections();
+        }
+    },
+
+    async refreshDevicesAndPreview() {
+        if (localStream) {
+            localStream.getTracks().forEach(track => track.stop());
+            localStream = null;
+        }
+
+        await this.loadDevices();
+        await this.ensureLocalMedia();
+
+        if (window.RelayRtc?.applyLocalStreamToAllPeerConnections) {
+            await window.RelayRtc.applyLocalStreamToAllPeerConnections();
+        }
+    },
+
+    async applyLocalStreamToPeerConnection(pc, username) {
+        const stream = await this.ensureLocalMedia();
+        const existingSenders = pc.getSenders();
+
+        for (const track of stream.getTracks()) {
+            const existingSender = existingSenders.find(sender =>
+                sender.track && sender.track.kind === track.kind
+            );
+
+            if (existingSender) {
+                await existingSender.replaceTrack(track);
+                LogMessage(`Replaced local ${track.kind} track for ${username}`);
+            } else {
+                pc.addTrack(track, stream);
+                LogMessage(`Added local ${track.kind} track for ${username}`);
+            }
+        }
+    },
+
+    async applyLocalStreamToAllPeerConnections() {
+        if (!window.RelayRtc?.peerConnections) return;
+
+        for (const [username, pc] of Object.entries(window.RelayRtc.peerConnections)) {
+            await this.applyLocalStreamToPeerConnection(pc, username);
+        }
+    },
+
+    attachRemoteStream(username, stream) {
+        remoteStreams[username] = stream;
+
+        const tile = this.ensureRemoteTile(username);
+        const video = tile.querySelector("video");
+        const status = tile.querySelector(".remote-media-status");
+
+        if (video) {
+            video.srcObject = stream;
+        }
+
+        const audioTracks = stream.getAudioTracks();
+        const videoTracks = stream.getVideoTracks();
+
+        if (status) {
+            status.textContent =
+                `${audioTracks.length > 0 ? "Audio" : "No audio"} / ` +
+                `${videoTracks.length > 0 ? "Video" : "No video"}`;
+        }
+    },
+
+    ensureRemoteTile(username) {
+        const container = document.getElementById("remoteMediaContainer");
+        if (!container) return null;
+
+        let tile = document.getElementById(`remote-tile-${username}`);
+        if (tile) return tile;
+
+        tile = document.createElement("div");
+        tile.id = `remote-tile-${username}`;
+        tile.className = "remote-media-tile";
+
+        const title = document.createElement("div");
+        title.className = "remote-media-title";
+        title.textContent = username;
+
+        const video = document.createElement("video");
+        video.autoplay = true;
+        video.playsInline = true;
+
+        const status = document.createElement("div");
+        status.className = "remote-media-status";
+        status.textContent = "Remote media: waiting...";
+
+        tile.appendChild(title);
+        tile.appendChild(video);
+        tile.appendChild(status);
+
+        container.appendChild(tile);
+
+        return tile;
+    },
+
+    removeRemoteStream(username) {
+        delete remoteStreams[username];
+
+        const tile = document.getElementById(`remote-tile-${username}`);
+        if (tile) {
+            tile.remove();
+        }
+    },
+
+    wireDeviceSelectors() {
+        const cameraSelect = document.getElementById("cameraSelect");
+        const micSelect = document.getElementById("micSelect");
+
+        if (cameraSelect) {
+            cameraSelect.addEventListener("change", async () => {
+                LogMessage("Camera changed");
+                await this.restartLocalMedia();
+            });
+        }
+
+        if (micSelect) {
+            micSelect.addEventListener("change", async () => {
+                LogMessage("Microphone changed");
+                await this.restartLocalMedia();
+            });
+        }
+    }
+};
+
+window.Media = Media;

RelayClient/Resources/Raw/wwwroot/relaySocket.js

@@ -0,0 +1,46 @@
+const RelaySocket = {
+    async joinRtcChannel() {
+        await window.HybridWebView.InvokeDotNet("JoinRtcChannel");
+    },
+
+    async leaveRtcChannel() {
+        await window.HybridWebView.InvokeDotNet("LeaveRtcChannel");
+    },
+
+    async getRtcParticipants() {
+        const raw = await window.HybridWebView.InvokeDotNet("GetRtcParticipants");
+
+        if (!raw) return [];
+
+        return typeof raw === "string"
+            ? JSON.parse(raw)
+            : raw;
+    },
+
+    async sendRtcSignal(signal) {
+        if (!signal.channelId) signal.channelId = currentChannelId;
+        if (!signal.from) signal.from = currentUsername;
+
+        await window.HybridWebView.InvokeDotNet("SendRtcSignal", [
+            JSON.stringify(signal)
+        ]);
+    },
+
+    receiveRtcSignal(rawJson) {
+        LogMessage("RelaySocket.receiveRtcSignal hit");
+
+        if (window.RelayRtc?.handleRtcSignal) {
+            LogMessage("Forwarding RTC signal to RelayRtc.handleRtcSignal");
+            return window.RelayRtc.handleRtcSignal(rawJson);
+        }
+
+        if (typeof window.handleRtcSignal === "function") {
+            LogMessage("Forwarding RTC signal to window.handleRtcSignal");
+            return window.handleRtcSignal(rawJson);
+        }
+
+        LogMessage("No RTC signal handler registered.");
+    }
+};
+
+window.RelaySocket = RelaySocket;

RelayClient/Resources/Raw/wwwroot/rtc.js

@@ -0,0 +1,235 @@
+const peerConnections = {};
+
+async function joinChannelCall() {
+    LogMessage("Current username: " + currentUsername);
+    LogMessage("Current channel: " + currentChannelId);
+
+    if (!currentUsername || !currentChannelId) {
+        LogMessage("Cannot join RTC: missing username or channel.");
+        return;
+    }
+
+    await RelaySocket.joinRtcChannel();
+    await Media.ensureLocalMedia();
+
+    const participants = await RelaySocket.getRtcParticipants();
+
+    LogMessage("Participants: " + JSON.stringify(participants));
+
+    const existingUsers = participants.filter(x => x !== currentUsername);
+
+    if (existingUsers.length === 0) {
+        LogMessage("Joined call as first participant. Waiting for others...");
+        return;
+    }
+
+    for (const username of existingUsers) {
+        await sendOffer(username); //Creates an offer to each person in call for MESH RTC
+    }
+}
+
+async function sendOffer(username) {
+    const pc = await ensurePeerConnectionForUser(username);
+
+    await Media.applyLocalStreamToPeerConnection(pc, username);
+
+    const offer = await pc.createOffer();
+    // LogMessage(`Offer created: ${JSON.stringify(offer)}`);
+    await pc.setLocalDescription(offer);
+
+    await RelaySocket.sendRtcSignal({
+        type: "rtc_offer",
+        channelId: currentChannelId,
+        from: currentUsername,
+        to: username,
+        sdp: offer.sdp
+    });
+
+    LogMessage(`Sent offer to ${username}`);
+}
+
+async function handleRtcSignal(rawJson) {
+    try {
+        const msg = typeof rawJson === "string" ? JSON.parse(rawJson) : rawJson;
+
+        if (!msg || !msg.type) return;
+        if (msg.from === currentUsername) return;
+
+        if (msg.to && msg.to !== currentUsername) {
+            LogMessage(`Ignoring RTC signal meant for ${msg.to}`);
+            return;
+        }
+
+        LogMessage(`Received signal: ${msg.type} from ${msg.from}`);
+
+        if (msg.type === "rtc_offer") {
+            await handleOffer(msg);
+            return;
+        }
+
+        if (msg.type === "rtc_answer") {
+            await handleAnswer(msg);
+            return;
+        }
+
+        if (msg.type === "rtc_ice") {
+            await handleIce(msg);
+            return;
+        }
+
+        if (msg.type === "rtc_leave") {
+            closePeerConnection(msg.from);
+            return;
+        }
+
+        LogMessage("Unhandled RTC signal type: " + msg.type);
+    } catch (err) {
+        LogMessage("handleRtcSignal failed: " + err);
+    }
+}
+
+async function handleOffer(msg) {
+    LogMessage(`Offer handler: ${msg}`);
+    const pc = await ensurePeerConnectionForUser(msg.from);
+
+    await Media.ensureLocalMedia();
+    await Media.applyLocalStreamToPeerConnection(pc, msg.from);
+    // const offer = JSON.parse(msg.offer);
+    await pc.setRemoteDescription({
+        type: "offer",
+        sdp: msg.sdp
+    });
+
+    const answer = await pc.createAnswer();
+    await pc.setLocalDescription(answer);
+
+    await RelaySocket.sendRtcSignal({
+        type: "rtc_answer",
+        channelId: currentChannelId,
+        from: currentUsername,
+        to: msg.from,
+        sdp: answer.sdp
+    });
+
+    LogMessage(`Sent answer to ${msg.from}`);
+}
+
+async function handleAnswer(msg) {
+    const pc = peerConnections[msg.from];
+
+    if (!pc) {
+        LogMessage(`No peer connection found for answer from ${msg.from}`);
+        return;
+    }
+
+    await pc.setRemoteDescription({
+        type: "answer",
+        sdp: msg.sdp
+    });
+
+    LogMessage(`Applied answer from ${msg.from}`);
+}
+
+async function handleIce(msg) {
+    const pc = peerConnections[msg.from];
+
+    if (!pc) {
+        LogMessage(`No peer connection found for ICE from ${msg.from}`);
+        return;
+    }
+
+    if (!msg.candidate) return;
+    
+    const candidateInit = {
+        candidate: msg.candidate,
+        sdpMid: msg.sdpMid,
+        sdpMLineIndex: msg.sdpMLineIndex
+    };
+
+    await pc.addIceCandidate(candidateInit);
+
+    LogMessage(`Applied ICE from ${msg.from}`);
+}
+
+async function ensurePeerConnectionForUser(username) {
+    if (peerConnections[username]) {
+        return peerConnections[username];
+    }
+
+    const pc = new RTCPeerConnection(configuration);
+    peerConnections[username] = pc;
+
+    pc.onicecandidate = async event => {
+        if (!event.candidate) return;
+
+        await RelaySocket.sendRtcSignal({
+            type: "rtc_ice",
+            channelId: currentChannelId,
+            from: currentUsername,
+            to: username,
+            candidate: event.candidate.candidate,
+            sdpMid: event.candidate.sdpMid,
+            sdpMLineIndex: event.candidate.sdpMLineIndex
+        });
+    };
+
+    pc.ontrack = event => {
+        LogMessage(`Remote track received from ${username}`);
+
+        const stream = event.streams[0];
+        if (!stream) return;
+
+        Media.attachRemoteStream(username, stream);
+    };
+
+    pc.onconnectionstatechange = () => {
+        LogMessage(`Connection ${username}: ${pc.connectionState}`);
+
+        if (
+            pc.connectionState === "failed" ||
+            pc.connectionState === "closed" ||
+            pc.connectionState === "disconnected"
+        ) {
+            closePeerConnection(username);
+        }
+    };
+
+    return pc;
+}
+
+async function leaveChannelCall() {
+    await RelaySocket.sendRtcSignal({
+        type: "rtc_leave",
+        channelId: currentChannelId,
+        from: currentUsername
+    });
+
+    for (const username of Object.keys(peerConnections)) {
+        closePeerConnection(username);
+    }
+
+    await RelaySocket.leaveRtcChannel();
+
+    LogMessage("Left RTC channel");
+}
+
+function closePeerConnection(username) {
+    const pc = peerConnections[username];
+    if (!pc) return;
+
+    pc.close();
+    delete peerConnections[username];
+
+    Media.removeRemoteStream(username);
+
+    LogMessage(`Closed RTC connection with ${username}`);
+}
+
+window.RelayRtc = {
+    joinChannelCall,
+    leaveChannelCall,
+    handleRtcSignal,
+    peerConnections
+};
+
+window.handleRtcSignal = handleRtcSignal;

RelayClient/Resources/Styles/Styles.xaml

@@ -25,7 +25,7 @@
     <Style TargetType="Button">
         <Setter Property="TextColor" Value="{AppThemeBinding Light={StaticResource White}, Dark={StaticResource PrimaryDarkText}}" />
         <Setter Property="BackgroundColor" Value="{AppThemeBinding Light={StaticResource Primary}, Dark={StaticResource PrimaryDark}}" />
-        <Setter Property="FontFamily" Value="OpenSansRegular"/>
+        <Setter Property="FontFamily" Value="AnonymousProRegular"/>
         <Setter Property="FontSize" Value="14"/>
         <Setter Property="BorderWidth" Value="0"/>
         <Setter Property="CornerRadius" Value="8"/>
@@ -69,7 +69,7 @@
     <Style TargetType="DatePicker">
         <Setter Property="TextColor" Value="{AppThemeBinding Light={StaticResource Gray900}, Dark={StaticResource White}}" />
         <Setter Property="BackgroundColor" Value="Transparent" />
-        <Setter Property="FontFamily" Value="OpenSansRegular"/>
+        <Setter Property="FontFamily" Value="AnonymousProRegular"/>
         <Setter Property="FontSize" Value="14"/>
         <Setter Property="MinimumHeightRequest" Value="44"/>
         <Setter Property="MinimumWidthRequest" Value="44"/>
@@ -90,7 +90,7 @@
     <Style TargetType="Editor">
         <Setter Property="TextColor" Value="{AppThemeBinding Light={StaticResource Black}, Dark={StaticResource White}}" />
         <Setter Property="BackgroundColor" Value="Transparent" />
-        <Setter Property="FontFamily" Value="OpenSansRegular"/>
+        <Setter Property="FontFamily" Value="AnonymousProRegular"/>
         <Setter Property="FontSize" Value="14" />
         <Setter Property="PlaceholderColor" Value="{AppThemeBinding Light={StaticResource Gray200}, Dark={StaticResource Gray500}}" />
         <Setter Property="MinimumHeightRequest" Value="44"/>
@@ -112,7 +112,7 @@
     <Style TargetType="Entry">
         <Setter Property="TextColor" Value="{AppThemeBinding Light={StaticResource Black}, Dark={StaticResource White}}" />
         <Setter Property="BackgroundColor" Value="Transparent" />
-        <Setter Property="FontFamily" Value="OpenSansRegular"/>
+        <Setter Property="FontFamily" Value="AnonymousProRegular"/>
         <Setter Property="FontSize" Value="14" />
         <Setter Property="PlaceholderColor" Value="{AppThemeBinding Light={StaticResource Gray200}, Dark={StaticResource Gray500}}" />
         <Setter Property="MinimumHeightRequest" Value="44"/>
@@ -156,7 +156,7 @@
     <Style TargetType="Label">
         <Setter Property="TextColor" Value="{AppThemeBinding Light={StaticResource Black}, Dark={StaticResource White}}" />
         <Setter Property="BackgroundColor" Value="Transparent" />
-        <Setter Property="FontFamily" Value="OpenSansRegular" />
+        <Setter Property="FontFamily" Value="AnonymousProRegular" />
         <Setter Property="FontSize" Value="14" />
         <Setter Property="VisualStateManager.VisualStateGroups">
             <VisualStateGroupList>
@@ -190,7 +190,7 @@
         <Setter Property="TextColor" Value="{AppThemeBinding Light={StaticResource Gray900}, Dark={StaticResource White}}" />
         <Setter Property="TitleColor" Value="{AppThemeBinding Light={StaticResource Gray900}, Dark={StaticResource Gray200}}" />
         <Setter Property="BackgroundColor" Value="Transparent" />
-        <Setter Property="FontFamily" Value="OpenSansRegular"/>
+        <Setter Property="FontFamily" Value="AnonymousProRegular"/>
         <Setter Property="FontSize" Value="14" />
         <Setter Property="MinimumHeightRequest" Value="44"/>
         <Setter Property="MinimumWidthRequest" Value="44"/>
@@ -228,7 +228,7 @@
     <Style TargetType="RadioButton">
         <Setter Property="BackgroundColor" Value="Transparent"/>
         <Setter Property="TextColor" Value="{AppThemeBinding Light={StaticResource Black}, Dark={StaticResource White}}" />
-        <Setter Property="FontFamily" Value="OpenSansRegular"/>
+        <Setter Property="FontFamily" Value="AnonymousProRegular"/>
         <Setter Property="FontSize" Value="14"/>
         <Setter Property="MinimumHeightRequest" Value="44"/>
         <Setter Property="MinimumWidthRequest" Value="44"/>
@@ -255,7 +255,7 @@
         <Setter Property="PlaceholderColor" Value="{StaticResource Gray500}" />
         <Setter Property="CancelButtonColor" Value="{StaticResource Gray500}" />
         <Setter Property="BackgroundColor" Value="Transparent" />
-        <Setter Property="FontFamily" Value="OpenSansRegular" />
+        <Setter Property="FontFamily" Value="AnonymousProRegular" />
         <Setter Property="FontSize" Value="14" />
         <Setter Property="MinimumHeightRequest" Value="44"/>
         <Setter Property="MinimumWidthRequest" Value="44"/>
@@ -278,7 +278,7 @@
         <Setter Property="TextColor" Value="{AppThemeBinding Light={StaticResource Gray900}, Dark={StaticResource White}}" />
         <Setter Property="PlaceholderColor" Value="{StaticResource Gray500}" />
         <Setter Property="BackgroundColor" Value="Transparent" />
-        <Setter Property="FontFamily" Value="OpenSansRegular" />
+        <Setter Property="FontFamily" Value="AnonymousProRegular" />
         <Setter Property="FontSize" Value="14" />
         <Setter Property="VisualStateManager.VisualStateGroups">
             <VisualStateGroupList>
@@ -358,7 +358,7 @@
     <Style TargetType="TimePicker">
         <Setter Property="TextColor" Value="{AppThemeBinding Light={StaticResource Gray900}, Dark={StaticResource White}}" />
         <Setter Property="BackgroundColor" Value="Transparent"/>
-        <Setter Property="FontFamily" Value="OpenSansRegular"/>
+        <Setter Property="FontFamily" Value="AnonymousProRegular"/>
         <Setter Property="FontSize" Value="14"/>
         <Setter Property="MinimumHeightRequest" Value="44"/>
         <Setter Property="MinimumWidthRequest" Value="44"/>

RelayClient/ServerAPI.cs

@@ -0,0 +1,194 @@
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+using System.Text.Json;
+using RelayShared.Services;
+
+namespace RelayClient;
+
+public class ServerAPI
+{
+    static HttpClient client = new HttpClient { BaseAddress = new Uri("http://127.0.0.1:5000/") };
+    static HttpClient core = new HttpClient { BaseAddress = new Uri("http://127.0.0.1:1337/") };
+    // static HttpClient client = new HttpClient { BaseAddress = new Uri("http://192.168.1.92:5000/") };
+    // static HttpClient core = new HttpClient { BaseAddress = new Uri("http://192.168.1.92:1337/") };
+    
+    public static async Task setupClient()
+    {
+        client.DefaultRequestHeaders.Accept.Clear();
+        client.DefaultRequestHeaders.Accept.Add(
+            new MediaTypeWithQualityHeaderValue("application/json"));
+        core.DefaultRequestHeaders.Accept.Clear();
+        core.DefaultRequestHeaders.Accept.Add(
+            new MediaTypeWithQualityHeaderValue("application/json"));
+        core.DefaultRequestHeaders.Add("User-Agent", "RelayClient");
+        MainPage._userToken = await CoreUserSignin(new AuthSignin
+        {
+            UserName = MainPage._username,
+            Password = "password"
+        });
+
+        await CoreUserAlive(new AuthSignin
+        {
+            UserName = MainPage._username,
+            Password = MainPage._userToken
+        });
+    }
+
+    public static async Task<Uri> CoreUserAlive(AuthSignin data)
+    {
+        HttpResponseMessage response = await core.PostAsJsonAsync("user/isAlive", data);
+        response.EnsureSuccessStatusCode();
+        return response.Headers.Location;
+    }
+
+    public static async Task<string> CoreUserSignin(AuthSignin data)
+    {
+        HttpResponseMessage response = await core.PostAsJsonAsync("user/signin", data);
+        response.EnsureSuccessStatusCode();
+        return await response.Content.ReadAsStringAsync();
+    }
+    
+    public static async Task<Uri> PostOfferAsync(DBOffer offer)
+    {
+        HttpResponseMessage response = await client.PostAsJsonAsync(
+            "api/rtc/offer", offer);
+        response.EnsureSuccessStatusCode();
+        return response.Headers.Location;
+    }
+
+    public static async Task<Uri> GetAllOffersAsync()
+    {
+        HttpResponseMessage response = await client.GetAsync("api/rtc/offers");
+        response.EnsureSuccessStatusCode();
+        return response.Headers.Location;
+    }
+
+    public static async Task<bool> GetIsChannelActiveAsync(string channelId)
+    {
+        HttpResponseMessage response = await client.GetAsync($"api/rtc/active/{channelId}");
+        response.EnsureSuccessStatusCode();
+        return  bool.Parse(response.Content.ReadAsStringAsync().Result);
+    }
+
+    public static async Task<RtcDescription> GetOffersForChannelAsync(string channelId)
+    {
+        HttpResponseMessage response = await client.GetAsync($"api/rtc/offers/{channelId}");
+        response.EnsureSuccessStatusCode();
+        RtcDescription? offer = JsonSerializer.Deserialize<RtcDescription>(await response.Content.ReadAsStringAsync());
+        return offer;
+    }
+
+    public static async Task<Uri?> PostAnswerAsync(DBOffer answer)
+    {
+        HttpResponseMessage response = await client.PostAsJsonAsync("api/rtc/answer", answer);
+        var body = await response.Content.ReadAsStringAsync();
+
+        Console.WriteLine("PostAnswerAsync status: " + response.StatusCode);
+        Console.WriteLine("PostAnswerAsync body: " + body);
+
+        response.EnsureSuccessStatusCode();
+        return response.Headers.Location;
+    }
+
+    public static async Task<Uri> GetAnswersForChannelAsync(string channelId)
+    {
+        HttpResponseMessage response = await client.GetAsync($"api/rtc/answers/{channelId}");
+        response.EnsureSuccessStatusCode();
+        return response.Headers.Location;
+    }
+
+    public static async Task<Uri> GetLatestAnswerForChannelAsync(string channelId)
+    {
+        HttpResponseMessage response = await client.GetAsync($"api/rtc/latest/{channelId}");
+        response.EnsureSuccessStatusCode();
+        return response.Headers.Location;
+    }
+
+    public static async Task<Uri> PostIceCandidateAsync(DBIceCandidate candidate)
+    {
+        HttpResponseMessage response = await client.PostAsJsonAsync("api/rtc/candidate", candidate);
+        response.EnsureSuccessStatusCode();
+        return response.Headers.Location;
+    }
+
+    public static async Task<Uri> GetIceCandidatesForChannelAsync(string channelId)
+    {
+        HttpResponseMessage response = await client.GetAsync($"api/rtc/candidates/{channelId}");
+        response.EnsureSuccessStatusCode();
+        return response.Headers.Location;
+    }
+
+    public static async Task<Uri> GetIceCandidatesForChannelByUserAsync(string channelId, string userId, string directions)
+    {
+        HttpResponseMessage response = await client.GetAsync($"api/rtc/candidates/{channelId}/{userId}/{directions}");
+        response.EnsureSuccessStatusCode();
+        return response.Headers.Location;
+    }
+
+    public static async Task<Uri> PostLeave(RtcLeave leave)
+    {
+        HttpResponseMessage response = await client.PostAsJsonAsync("api/rtc/leave", leave);
+        response.EnsureSuccessStatusCode();
+        return response.Headers.Location;
+    }
+    
+    public static async Task<RtcDescription?> GetAnswerForChannelAsync(string? channelId)
+    {
+        if (string.IsNullOrWhiteSpace(channelId))
+            return null;
+
+        HttpResponseMessage response = await client.GetAsync($"api/rtc/answer/{channelId}");
+        if (!response.IsSuccessStatusCode)
+            return null;
+
+        var json = await response.Content.ReadAsStringAsync();
+        return JsonSerializer.Deserialize<RtcDescription>(json);
+    }
+    
+    public static async Task<List<string>> GetRtcParticipantsAsync(string? channelId)
+    {
+        if (string.IsNullOrWhiteSpace(channelId))
+            return new List<string>();
+
+        HttpResponseMessage response = await client.GetAsync($"api/rtc/participants/{channelId}");
+        response.EnsureSuccessStatusCode();
+
+        var json = await response.Content.ReadAsStringAsync();
+
+        return JsonSerializer.Deserialize<List<string>>(json) ?? new List<string>();
+    }
+}
+
+public class RtcDescription
+{
+    public string type { get; set; }
+    public string sdp { get; set; }
+}
+
+public class DBOffer
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+    public required RtcDescription SessionDescription { get; set; }
+}
+public class IceCandidate
+{
+    public required string candidate { get; set; }
+    public required string sdpMid { get; set; }
+    public required int sdpMLineIndex { get; set; }
+    public required string usernameFragment { get; set; }
+    
+}
+
+public class DBIceCandidate
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+    public required IceCandidate Candidate { get; set; }
+}
+
+public class RtcLeave
+{
+    public string ChannelId { get; set; }
+    public string Username { get; set; }
+}

RelayClient/Services/RelaySocketClient.cs

@@ -0,0 +1,281 @@
+using System.Text.Json;
+using RelayClient.Crypto;
+using RelayShared.Services;
+using WebSocketSharp;
+
+namespace RelayClient.Services;
+
+/// <summary>
+/// The client-side WebSocket transport. Mirrors ChatSocketBehavior on the server.
+///
+/// Sending: typed helpers (SendGetHistory, SendRtcJoinChannel, SendEditMessage, …) build the
+/// appropriate WsControlMessage or SocketEncryptedMessage and route through SendRaw. SendRaw
+/// always uses synchronous _socket.Send because WebSocketSharp's SendAsync calls
+/// Action.BeginInvoke internally, which throws PlatformNotSupportedException on .NET 5+.
+/// Callers that need non-blocking sends (e.g. MainPage.SendMessage for image attachments)
+/// wrap the call in Task.Run.
+///
+/// Receiving: OnMessage peeks the JSON. If it has an "Event" property → WsEventMessage (acks).
+/// If it has a "Type" property → SignalType discriminator, deserialise into the right Socket*
+/// type, fire the matching C# event. MainPage subscribes to these events.
+///
+/// Connect order matters: the first frame after the handshake is Authenticate (so the server
+/// can verify the Core-issued token), then RegisterKey (so the server has our public key
+/// before any encrypted message arrives), then GetServerKey + GetChannels.
+/// </summary>
+public sealed class RelaySocketClient
+{
+    /// <summary>Username this socket is authenticated as. Captured at construction.</summary>
+    private readonly string _username;
+
+    /// <summary>The underlying WebSocketSharp client. Owned (constructed) by this class.</summary>
+    private readonly WebSocket _socket;
+
+    /// <summary>
+    /// The server's RSA public key, cached after the first GetServerKey response.
+    /// MainPage reads this to encrypt outbound chat payloads.
+    /// </summary>
+    public string? ServerPublicKey { get; private set; }
+
+    /// <summary>Fires for every raw incoming text frame. Mostly used for debug logging.</summary>
+    public event Action<string>? RawMessageReceived;
+
+    /// <summary>Fires when the server pushes a fresh channel list (initial connect or after CRUD).</summary>
+    public event Action<SocketChannelList>? ChannelListReceived;
+
+    /// <summary>Fires for newly-arrived chat messages (SignalType.EncryptedChat).</summary>
+    public event Action<SocketEncryptedMessage>? EncryptedChatReceived;
+
+    /// <summary>Fires when an existing message is edited by its author (SignalType.MessageEdited).</summary>
+    public event Action<SocketEncryptedMessage>? MessageEdited;
+
+    /// <summary>Fires when a message is deleted (SignalType.MessageDeleted).</summary>
+    public event Action<SocketMessageDeletedEvent>? MessageDeleted;
+
+    /// <summary>Fires when another user is typing in a channel.</summary>
+    public event Action<SocketTypingEvent>? TypingReceived;
+
+    /// <summary>Fires in response to a SendGetEditHistory request.</summary>
+    public event Action<SocketEditHistoryResponse>? EditHistoryReceived;
+
+    /// <summary>Fires for encrypted RTC SDP/ICE signals — RtcBridgeService forwards into the JS engine.</summary>
+    public event Action<SocketRtcSignalMessage>? EncryptedRtcSignalReceived;
+
+    /// <summary>Fires once when the server's public key arrives. Mainly used by tests; production reads ServerPublicKey directly.</summary>
+    public event Action<string>? ServerPublicKeyReceived;
+
+    /// <summary>Diagnostic logger. MainPage subscribes Console.WriteLine here.</summary>
+    public event Action<string>? Log;
+
+    /// <summary>Default URL points at localhost dev server. Production passes a remote URL.</summary>
+    public RelaySocketClient(string username, string url = "ws://127.0.0.1:5001/")
+    {
+        _username = username;
+        _socket = new WebSocket(url);
+        _socket.OnMessage += OnMessage;
+    }
+
+    /// <summary>
+    /// Opens the WebSocket and fires the four-step boot handshake IN ORDER:
+    /// Authenticate → RegisterKey → GetServerKey → GetChannels. Order matters because the
+    /// server uses RegisterKey to populate its session→username map (needed for permission
+    /// checks on subsequent messages).
+    /// </summary>
+    public void Connect()
+    {
+        _socket.Connect();
+
+        var publicKey = KeyStorage.LoadPublicKey(_username);
+
+        SendControlMessage(new WsControlMessage { Action = WsAction.Authenticate, Username = _username, Token = MainPage._userToken });
+        SendControlMessage(new WsControlMessage { Action = WsAction.RegisterKey,  Username = _username, PublicKey = publicKey });
+        SendControlMessage(new WsControlMessage { Action = WsAction.GetServerKey });
+        SendControlMessage(new WsControlMessage { Action = WsAction.GetChannels });
+    }
+
+    /// <summary>Detaches the message handler and closes the socket. Called from MainPage.OnDisappearing.</summary>
+    public void Disconnect()
+    {
+        _socket.OnMessage -= OnMessage;
+        if (_socket.ReadyState == WebSocketState.Open)
+            _socket.Close();
+    }
+
+    /// <summary>Generic control-plane send. Serialises the WsControlMessage to JSON and ships it.</summary>
+    public void SendControlMessage(WsControlMessage message) =>
+        SendRaw(JsonSerializer.Serialize(message));
+
+    /// <summary>Request the message history for a channel. Server streams it back as individual EncryptedChat frames.</summary>
+    public void SendGetHistory(string channelId) =>
+        SendControlMessage(new WsControlMessage { Action = WsAction.GetHistory, Username = _username, ChannelId = channelId });
+
+    /// <summary>Tell the server we've joined a voice channel. Fires Speak permission check server-side.</summary>
+    public void SendRtcJoinChannel(string channelId) =>
+        SendControlMessage(new WsControlMessage { Action = WsAction.RtcJoin,  Username = _username, ChannelId = channelId });
+
+    /// <summary>Tell the server we've left the voice channel. Idempotent server-side.</summary>
+    public void SendRtcLeaveChannel(string channelId) =>
+        SendControlMessage(new WsControlMessage { Action = WsAction.RtcLeave, Username = _username, ChannelId = channelId });
+
+    /// <summary>Notify channel peers that we're typing. Server broadcasts a SocketTypingEvent to everyone but us.</summary>
+    public void SendTyping(string channelId) =>
+        SendControlMessage(new WsControlMessage { Action = WsAction.SendTyping, Username = _username, ChannelId = channelId });
+
+    /// <summary>Request all historical versions of a message. Server replies with SocketEditHistoryResponse.</summary>
+    public void SendGetEditHistory(string messageId, string channelId) =>
+        SendControlMessage(new WsControlMessage { Action = WsAction.GetEditHistory, Username = _username, MessageId = messageId, ChannelId = channelId });
+
+    /// <summary>Create a new channel. Permission-gated server-side; on success the server broadcasts a fresh channel list.</summary>
+    public void SendCreateChannel(string name, ChannelType type, string group = "") =>
+        SendControlMessage(new WsControlMessage
+        {
+            Action = WsAction.CreateChannel,
+            ChannelName = name,
+            ChannelType = (int)type,
+            ChannelGroup = group
+        });
+
+    /// <summary>Soft-delete a channel. Permission-gated server-side.</summary>
+    public void SendDeleteChannel(string channelId) =>
+        SendControlMessage(new WsControlMessage { Action = WsAction.DeleteChannel, ChannelId = channelId });
+
+    /// <summary>
+    /// Send an edit for an existing message. Caller is responsible for encrypting the new
+    /// content (with the server's public key) before calling — same encryption shape as a new send.
+    /// </summary>
+    public void SendEditMessage(string messageId, string channelId, EncryptedPayload encrypted) =>
+        SendJson(new SocketEncryptedMessage
+        {
+            Type = SignalType.ClientEditMessage, MessageId = messageId,
+            SenderUsername = _username, ChannelId = channelId,
+            CipherText = encrypted.CipherText, Nonce = encrypted.Nonce,
+            Tag = encrypted.Tag, EncryptedKey = encrypted.EncryptedKey
+        });
+
+    /// <summary>Request soft-delete of one of our own messages. Server checks ownership before honoring.</summary>
+    public void SendDeleteMessage(string messageId, string channelId) =>
+        SendJson(new SocketEncryptedMessage
+        {
+            Type = SignalType.ClientDeleteMessage, MessageId = messageId,
+            SenderUsername = _username, ChannelId = channelId
+        });
+
+    /// <summary>
+    /// The single send pinch point. Synchronous (WebSocketSharp's SendAsync is broken on .NET 5+
+    /// due to Action.BeginInvoke). All exceptions are logged AND rethrown so the calling
+    /// Task.Run can surface them to the user via DisplayAlert.
+    /// </summary>
+    public void SendRaw(string message)
+    {
+        if (_socket.ReadyState != WebSocketState.Open)
+        {
+            Log?.Invoke($"[{_username}] Drop: socket not open ({_socket.ReadyState}), {message.Length} bytes.");
+            return;
+        }
+
+        try
+        {
+            _socket.Send(message);
+        }
+        catch (Exception ex)
+        {
+            Log?.Invoke($"[{_username}] Send failed ({message.Length} bytes): {ex.Message}");
+            throw;
+        }
+    }
+
+    /// <summary>Convenience: JSON-serialise any payload and ship it. Used for all SocketEncryptedMessage and WsControlMessage sends.</summary>
+    public void SendJson<T>(T payload) => SendRaw(JsonSerializer.Serialize(payload));
+
+    /// <summary>
+    /// WebSocketSharp callback for every incoming text frame. Peeks the JSON to decide whether
+    /// it's a control-plane ack (Event property) or data-plane message (Type property), then
+    /// fires the matching public C# event. Exceptions are caught locally so a malformed frame
+    /// can't drop the connection.
+    /// </summary>
+    private void OnMessage(object? sender, MessageEventArgs e)
+    {
+        RawMessageReceived?.Invoke(e.Data);
+        Log?.Invoke($"[{_username}] RAW: {e.Data[..Math.Min(200, e.Data.Length)]}");
+
+        try
+        {
+            using var doc = JsonDocument.Parse(e.Data);
+            var root = doc.RootElement;
+
+            if (root.TryGetProperty("Event", out var evEl))
+            {
+                var wsEvent = (WsEvent)evEl.GetInt32();
+                switch (wsEvent)
+                {
+                    case WsEvent.KeyRegistered: Log?.Invoke($"[{_username}] Key registered."); return;
+                    case WsEvent.Authenticated: Log?.Invoke($"[{_username}] Authenticated.");  return;
+                    case WsEvent.Error:
+                        var det = root.TryGetProperty("Detail", out var d) ? d.GetString() : null;
+                        Log?.Invoke($"[{_username}] Server error: {det}");
+                        return;
+                }
+                return;
+            }
+
+            if (!root.TryGetProperty("Type", out var typeEl)) return;
+            var type = (SignalType)typeEl.GetInt32();
+
+            switch (type)
+            {
+                case SignalType.ChannelList:
+                {
+                    var p = JsonSerializer.Deserialize<SocketChannelList>(e.Data);
+                    if (p is not null) ChannelListReceived?.Invoke(p);
+                    return;
+                }
+                case SignalType.ServerPublicKey:
+                {
+                    var p = JsonSerializer.Deserialize<ServerPublicKeyMessage>(e.Data);
+                    if (p is not null) { ServerPublicKey = p.PublicKey; ServerPublicKeyReceived?.Invoke(p.PublicKey); }
+                    return;
+                }
+                case SignalType.EncryptedSignal:
+                {
+                    var p = JsonSerializer.Deserialize<SocketRtcSignalMessage>(e.Data);
+                    if (p is not null) EncryptedRtcSignalReceived?.Invoke(p);
+                    return;
+                }
+                case SignalType.EncryptedChat:
+                {
+                    var p = JsonSerializer.Deserialize<SocketEncryptedMessage>(e.Data);
+                    if (p is not null) EncryptedChatReceived?.Invoke(p);
+                    return;
+                }
+                case SignalType.MessageEdited:
+                {
+                    var p = JsonSerializer.Deserialize<SocketEncryptedMessage>(e.Data);
+                    if (p is not null) MessageEdited?.Invoke(p);
+                    return;
+                }
+                case SignalType.MessageDeleted:
+                {
+                    var p = JsonSerializer.Deserialize<SocketMessageDeletedEvent>(e.Data);
+                    if (p is not null) MessageDeleted?.Invoke(p);
+                    return;
+                }
+                case SignalType.TypingIndicator:
+                {
+                    var p = JsonSerializer.Deserialize<SocketTypingEvent>(e.Data);
+                    if (p is not null) TypingReceived?.Invoke(p);
+                    return;
+                }
+                case SignalType.EditHistory:
+                {
+                    var p = JsonSerializer.Deserialize<SocketEditHistoryResponse>(e.Data);
+                    if (p is not null) EditHistoryReceived?.Invoke(p);
+                    return;
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            Log?.Invoke($"[{_username}] WS parse error: {ex.Message}");
+        }
+    }
+}

RelayClient/Services/RtcBridgeService.cs

@@ -0,0 +1,304 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using RelayClient.Crypto;
+using RelayShared.Rtc;
+using RelayShared.Services;
+
+namespace RelayClient.Services;
+
+/// <summary>
+/// The bridge between the C# WebSocket pipe and the JavaScript WebRTC engine
+/// running inside the HybridWebView (which is shown when a Voice channel is open).
+///
+/// Outbound (JS → C# → server): the WebView JS calls into C# via SendRtcSignal(json).
+/// We deserialise to RtcSignalMessage, encrypt with the server's public key, wrap in
+/// SocketRtcSignalMessage, and send through the WebSocket.
+///
+/// Inbound (server → C# → JS): the WebSocket fires EncryptedRtcSignalReceived. MainPage
+/// hands it to HandleIncomingRtcSignalAsync, which decrypts with the user's private key
+/// and calls back into JS via hybridWebView.InvokeJavaScriptAsync("testIndex", …).
+///
+/// JoinRtcChannel / LeaveRtcChannel just send WsAction control messages; presence tracking
+/// happens server-side in RtcChannelPresenceService.
+/// </summary>
+public sealed class RtcBridgeService
+{
+    /// <summary>The currently-signed-in username. Stamped onto outgoing RTC signals.</summary>
+    private readonly string _username;
+
+    /// <summary>The shared WebSocket to RelayServer. Outbound RTC signals ride on this.</summary>
+    private readonly RelaySocketClient _socket;
+
+    /// <summary>The MAUI HybridWebView that hosts the JS WebRTC engine. We push JS calls into it.</summary>
+    private readonly HybridWebView _hybridWebView;
+
+    /// <summary>Lazy view into MainPage._currentChannelId so we always have the current voice channel.</summary>
+    private readonly Func<string?> _getCurrentChannelId;
+
+    /// <summary>Diagnostic logger that surfaces messages back to the WebView UI. Used for status/error reporting.</summary>
+    private readonly Action<string> _sendRawToWebView;
+
+    /// <summary>Captures collaborators. MainPage constructs this once and never replaces it.</summary>
+    public RtcBridgeService(string username, RelaySocketClient socket, HybridWebView hybridWebView,
+                            Func<string?> getCurrentChannelId, Action<string> sendRawToWebView)
+    {
+        _username = username;
+        _socket = socket;
+        _hybridWebView = hybridWebView;
+        _getCurrentChannelId = getCurrentChannelId;
+        _sendRawToWebView = sendRawToWebView;
+    }
+
+    /// <summary>Sends RtcJoin for the currently-selected channel. Server-side, this triggers the Speak permission check and presence registration.</summary>
+    public Task JoinRtcChannel()
+    {
+        var channelId = _getCurrentChannelId();
+
+        if (string.IsNullOrWhiteSpace(channelId))
+            return Task.CompletedTask;
+
+        _socket.SendRtcJoinChannel(channelId);
+        return Task.CompletedTask;
+    }
+
+    /// <summary>Sends RtcLeave for the currently-selected channel. Clears server-side voice presence so peers stop seeing us.</summary>
+    public void LeaveRtcChannel()
+    {
+        var channelId = _getCurrentChannelId();
+
+        if (string.IsNullOrWhiteSpace(channelId))
+            return;
+
+        _socket.SendRtcLeaveChannel(channelId);
+    }
+
+    /// <summary>
+    /// Called from JavaScript (via the HybridWebView bridge) when the WebRTC engine wants to
+    /// send an SDP offer/answer or ICE candidate to other peers. Parses the JSON, fills in
+    /// missing ChannelId/From, encrypts with the server's public key, ships as
+    /// SocketRtcSignalMessage. The server then forwards it (re-encrypted per-recipient) to
+    /// every other session in the same voice channel.
+    /// </summary>
+    public void SendRtcSignal(string json)
+    {
+        if (string.IsNullOrWhiteSpace(_socket.ServerPublicKey))
+        {
+            _sendRawToWebView("SendRtcSignal failed: server public key not loaded.");
+            return;
+        }
+
+        RtcSignalMessage? rtcSignal;
+
+        try
+        {
+            rtcSignal = JsonSerializer.Deserialize<RtcSignalMessage>(json);
+        }
+        catch (Exception ex)
+        {
+            _sendRawToWebView("SendRtcSignal failed to parse RTC signal: " + ex.Message);
+            return;
+        }
+
+        if (rtcSignal is null)
+            return;
+
+        rtcSignal.ChannelId ??= _getCurrentChannelId();
+        rtcSignal.From ??= _username;
+
+        // _sendRawToWebView($"RTC_SIGNAL file: {JsonSerializer.Serialize(rtcSignal)}");
+        if (string.IsNullOrWhiteSpace(rtcSignal.ChannelId))
+        {
+            _sendRawToWebView("SendRtcSignal failed: missing channel id.");
+            return;
+        }
+
+        var outgoingJson = JsonSerializer.Serialize(rtcSignal);
+
+        try
+        {
+            var encrypted = E2EeHelper.EncryptForRecipient(outgoingJson, _socket.ServerPublicKey);
+
+            var payload = new SocketRtcSignalMessage
+            {
+                Type = SignalType.EncryptedSignal,
+                SenderUsername = _username,
+                ChannelId = rtcSignal.ChannelId,
+                CipherText = encrypted.CipherText,
+                Nonce = encrypted.Nonce,
+                Tag = encrypted.Tag,
+                EncryptedKey = encrypted.EncryptedKey
+            };
+
+            _socket.SendJson(payload);
+
+            _sendRawToWebView($"SendRtcSignal sent: {rtcSignal.Type} -> {rtcSignal.To}");
+        }
+        catch (Exception ex)
+        {
+            _sendRawToWebView("SendRtcSignal failed: " + ex.Message);
+        }
+    }
+
+    /// <summary>JS bridge: returns the current voice-channel roster as JSON. Hits ServerAPI's REST endpoint, not the WebSocket.</summary>
+    public async Task<string> GetRtcParticipants()
+    {
+        var channelId = _getCurrentChannelId();
+
+        if (string.IsNullOrWhiteSpace(channelId))
+            return "[]";
+
+        var participants = await ServerAPI.GetRtcParticipantsAsync(channelId);
+        return JsonSerializer.Serialize(participants ?? []);
+    }
+
+    /// <summary>
+    /// MainPage hands incoming SocketRtcSignalMessage frames here. Filters out our own
+    /// frames, validates the channel scope, decrypts with the user's private key, parses to
+    /// RtcSignalMessage, then pushes into the JS RTC engine via SendRtcSignalToJsAsync.
+    /// </summary>
+    public async Task HandleIncomingRtcSignalAsync(SocketRtcSignalMessage payload)
+    {
+        // _sendRawToWebView("HandleIncomingRtcSignal called");
+        var currentChannelId = _getCurrentChannelId();
+
+        if (payload.ChannelId != currentChannelId)
+        {
+            _sendRawToWebView("Channel id does not match");
+            return;
+        }
+
+        if (payload.SenderUsername == _username)
+        {
+            _sendRawToWebView("Received own message");
+            return;
+        }
+
+        string decryptedJson;
+        
+        try
+        {
+            var privateKey = KeyStorage.LoadPrivateKey(_username);
+
+            decryptedJson = E2EeHelper.DecryptForRecipient(
+                new EncryptedPayload
+                {
+                    CipherText = payload.CipherText,
+                    Nonce = payload.Nonce,
+                    Tag = payload.Tag,
+                    EncryptedKey = payload.EncryptedKey
+                },
+                privateKey
+            );
+        }
+        catch (Exception ex)
+        {
+            _sendRawToWebView("RTC decrypt failed: " + ex.Message);
+            return;
+        }
+
+        RtcSignalMessage? rtcSignal;
+
+        try
+        {
+            rtcSignal = JsonSerializer.Deserialize<RtcSignalMessage>(decryptedJson);
+            // _sendRawToWebView($"Received Encrypted Signal: [{rtcSignal.From}]: {rtcSignal.Offer}");
+        }
+        catch (Exception ex)
+        {
+            _sendRawToWebView("RTC signal parse failed: " + ex.Message);
+            return;
+        }
+
+        if (rtcSignal is null)
+        {
+            _sendRawToWebView("rtcSignal is null");
+            return;
+        }
+
+        if (!string.IsNullOrWhiteSpace(rtcSignal.To) &&
+            !string.Equals(rtcSignal.To, _username, StringComparison.OrdinalIgnoreCase))
+        {
+            _sendRawToWebView($"Ignoring RTC signal meant for {rtcSignal.To}");
+            return;
+        }
+
+        // _sendRawToWebView("Received encrypted RTC signal: " + decryptedJson);
+
+        await SendRtcSignalToJsAsync(rtcSignal);
+    }
+
+    /// <summary>
+    /// Pushes the current username and channelId into JS globals (window.setUsername, window.setChannelId).
+    /// Called whenever the user switches voice channels OR the JS engine reports rtc_page_ready.
+    /// </summary>
+    public Task PushRtcContextToJsAsync()
+    {
+        MainThread.BeginInvokeOnMainThread(async () =>
+        {
+            var usernameJson = JsonSerializer.Serialize(_username);
+            var channelIdJson = JsonSerializer.Serialize(_getCurrentChannelId());
+
+            await _hybridWebView.EvaluateJavaScriptAsync($"window.setUsername({usernameJson})");
+            await _hybridWebView.EvaluateJavaScriptAsync($"window.setChannelId({channelIdJson})");
+        });
+
+        return Task.CompletedTask;
+    }
+
+    /// <summary>
+    /// Final hop: hands a decrypted RtcSignalMessage off to the JS engine via
+    /// hybridWebView.InvokeJavaScriptAsync("testIndex", …). SDP strings have their newlines
+    /// escaped as "(rn)" because the JSON marshalling otherwise breaks them.
+    /// </summary>
+    private Task SendRtcSignalToJsAsync(RtcSignalMessage data)
+    {
+        if (data.Type == "rtc_offer" || data.Type == "rtc_answer")
+        {
+            data.Sdp = data.Sdp.Replace("\r\n", "(rn)");
+        }
+        MainThread.BeginInvokeOnMainThread(async () =>
+        {
+            try
+            {
+                // await _hybridWebView.InvokeJavaScriptAsync("testIndex", [JsonSerializer.Serialize(data)], [RtcJsType.Default.String]);
+                await _hybridWebView.InvokeJavaScriptAsync("testIndex", [data], [RtcJsType.Default.RtcSignalMessage]);
+                #region OldDebugger
+//                  var jsArg = JsonSerializer.Serialize(data);
+//
+//                 await _hybridWebView.EvaluateJavaScriptAsync($@"
+//                     try {{
+//                         window.HybridWebView.SendRawMessage('C# eval entered');
+//
+//                         if (!window.RelaySocket) {{
+//                             window.HybridWebView.SendRawMessage('window.RelaySocket missing');
+//                         }} else if (typeof window.RelaySocket.receiveRtcSignal !== 'function') {{
+//                             window.HybridWebView.SendRawMessage('RelaySocket.receiveRtcSignal missing');
+//                         }} else {{
+//                             window.HybridWebView.SendRawMessage('Calling RelaySocket.receiveRtcSignal');
+//                             window.RelaySocket.receiveRtcSignal({jsArg});
+//                         }}
+//                     }} catch (err) {{
+//                         window.HybridWebView.SendRawMessage('RTC JS dispatch failed: ' + err);
+//                     }}
+//                 ");
+                #endregion  
+            }
+            catch (Exception ex)
+            {
+                _sendRawToWebView("SendRtcSignalToJsAsync failed: " + ex.Message);
+            }
+        });
+        return Task.CompletedTask;
+    }
+}
+
+[JsonSourceGenerationOptions(WriteIndented = false)]
+[JsonSerializable(typeof(RtcDescription))]
+[JsonSerializable(typeof(List<RtcSignalMessage>))]
+[JsonSerializable(typeof(RtcSignalMessage))]
+[JsonSerializable(typeof(IceCandidate))]
+[JsonSerializable(typeof(List<IceCandidate>))]
+[JsonSerializable(typeof(string))]
+internal partial class RtcJsType : JsonSerializerContext
+{
+}

RelayCore/E2EeHelper.cs

@@ -1,82 +0,0 @@
-using System.Security.Cryptography;
-using System.Text;
-
-namespace RelayCore;
-
-public static class E2EeHelper
-{
-    public static (string publicKey, string privateKey) GenerateRsaKeyPair()
-    {
-        using var rsa = RSA.Create(2048);
-
-        var publicKey = Convert.ToBase64String(rsa.ExportSubjectPublicKeyInfo());
-        var privateKey = Convert.ToBase64String(rsa.ExportPkcs8PrivateKey());
-
-        return (publicKey, privateKey);
-    }
-
-    public static EncryptedMessagePayload EncryptForRecipient(string plainText, string recipientPublicKeyBase64)
-    {
-        var aesKey = RandomNumberGenerator.GetBytes(32);
-        var nonce = RandomNumberGenerator.GetBytes(12);
-        var plainBytes = Encoding.UTF8.GetBytes(plainText);
-        var cipherBytes = new byte[plainBytes.Length];
-        var tag = new byte[16];
-
-        using (var aes = new AesGcm(aesKey, 16))
-        {
-            aes.Encrypt(nonce, plainBytes, cipherBytes, tag);
-        }
-
-        var recipientPublicKey = Convert.FromBase64String(recipientPublicKeyBase64);
-        byte[] encryptedKey;
-
-        using (var rsa = RSA.Create())
-        {
-            rsa.ImportSubjectPublicKeyInfo(recipientPublicKey, out _);
-            encryptedKey = rsa.Encrypt(aesKey, RSAEncryptionPadding.OaepSHA256);
-        }
-
-        return new EncryptedMessagePayload
-        {
-            CipherText = Convert.ToBase64String(cipherBytes),
-            Nonce = Convert.ToBase64String(nonce),
-            Tag = Convert.ToBase64String(tag),
-            EncryptedKey = Convert.ToBase64String(encryptedKey)
-        };
-    }
-
-    public static string DecryptForRecipient(EncryptedMessagePayload payload, string recipientPrivateKeyBase64)
-    {
-        var encryptedKey = Convert.FromBase64String(payload.EncryptedKey);
-        var privateKey = Convert.FromBase64String(recipientPrivateKeyBase64);
-
-        byte[] aesKey;
-
-        using (var rsa = RSA.Create())
-        {
-            rsa.ImportPkcs8PrivateKey(privateKey, out _);
-            aesKey = rsa.Decrypt(encryptedKey, RSAEncryptionPadding.OaepSHA256);
-        }
-
-        var nonce = Convert.FromBase64String(payload.Nonce);
-        var tag = Convert.FromBase64String(payload.Tag);
-        var cipherBytes = Convert.FromBase64String(payload.CipherText);
-        var plainBytes = new byte[cipherBytes.Length];
-
-        using (var aes = new AesGcm(aesKey, 16))
-        {
-            aes.Decrypt(nonce, cipherBytes, tag, plainBytes);
-        }
-
-        return Encoding.UTF8.GetString(plainBytes);
-    }
-}
-
-public class EncryptedMessagePayload
-{
-    public required string CipherText { get; set; }
-    public required string Nonce { get; set; }
-    public required string Tag { get; set; }
-    public required string EncryptedKey { get; set; }
-}

RelayCore/Endpoints/AuthEndpoints.cs

@@ -0,0 +1,63 @@
+using Microsoft.Extensions.Primitives;
+using RelayCore.Services;
+using RelayShared.Services;
+
+namespace RelayCore.Endpoints;
+
+public static class AuthEndpoints
+{
+    public static void MapAuthEndpoints(this WebApplication app)
+    {
+        app.MapPost("/user/signin", async (AuthSignin request, APIAuthService service, HttpContext context) =>
+        {
+            string ip = "";
+            StringValues userAgent = "";
+            if (context != null)
+            {
+                ip = context.Connection.RemoteIpAddress?.MapToIPv4().ToString();
+                context.Request.Headers.TryGetValue("User-Agent", out userAgent);
+            }
+
+            var token = await service.UserSigninAsync(request, ip, userAgent.ToString());
+            
+            return token != null ? Results.Ok(token) : Results.Unauthorized();
+        });
+        app.MapGet("/users", async (APIAuthService service) =>
+        {
+            return Results.Ok(await service.GetUsersAsync());
+        });
+        app.MapPost("/user/register", async (AuthRegister request, APIAuthService service, HttpContext context) =>
+        {
+            var ip = context.Connection.RemoteIpAddress?.MapToIPv4().ToString();
+            context.Request.Headers.TryGetValue("User-Agent", out var userAgent);
+            
+            var token = await service.UserRegisterAsync(request, ip, userAgent);
+            return token != null  ? Results.Ok(token) : Results.Ok("Username or Email already exists!");
+        });
+        app.MapPost("/user/isAlive", async (AuthSignin request, HttpContext context) =>
+        {
+            var ip = context.Connection.RemoteIpAddress?.MapToIPv4().ToString();
+            context.Request.Headers.TryGetValue("User-Agent", out var userAgent);
+            
+            Console.WriteLine($"UN: {request.UserName}\nToken: {request.Password}\nIP: {ip}\nUserAgent: {userAgent}");
+            return Results.Ok();
+        });
+        app.MapPost("/server/verify/user", async (AuthUserVerify request, APIAuthService service) =>
+        {
+            bool valid = await service.ServerVerifyUser(request);
+            Console.WriteLine($"UN: {request.Username}\nToken: {request.Token}");
+            return Results.Ok(valid);
+        });
+        app.MapPost("/server/license/generate", async (AuthServerLicenseGenerate request, APIAuthService service) =>
+        {
+            var license = await service.ServerLicenseGenerate(request);
+            
+            return license != null ? Results.Ok(license) : Results.BadRequest();
+        });
+        app.MapPost("/server/license/verify", async (AuthServerLicenseVerify request, APIAuthService service) =>
+        {
+            bool valid = await service.ServerVerifyLicense(request);
+            return Results.Ok(valid);
+        });
+    }
+}

RelayCore/Enums/AccountStatuses.cs

@@ -0,0 +1,9 @@
+namespace RelayCore.Enums;
+
+public enum AccountStatuses
+{
+    Active,
+    Suspended,
+    Banned,
+    Deleted
+}

RelayCore/Enums/LicenseStatuses.cs

@@ -0,0 +1,9 @@
+namespace RelayCore.Enums;
+
+public enum LicenseStatuses
+{
+    Active,
+    Expired,
+    Renewable,
+    Revoked
+}

RelayCore/Enums/LicenseType.cs

@@ -0,0 +1,10 @@
+namespace RelayCore.Enums;
+
+public enum LicenseType
+{
+    Free,
+    Basic,
+    Advanced,
+    Pro,
+    Enterprise
+}

RelayCore/Enums/LogEvents.cs

@@ -0,0 +1,11 @@
+namespace RelayCore.Enums;
+
+public enum LogEvents
+{
+    LoginSuccess,
+    LoginFailure,
+    LogoutSuccess,
+    LogoutFailure,
+    PasswordResetSuccess,
+    PasswordResetFailure,
+}

RelayCore/Enums/OnlineStatuses.cs

@@ -0,0 +1,10 @@
+namespace RelayCore.Enums;
+
+public enum OnlineStatuses
+{
+    Online,
+    Busy,
+    DND,
+    Invisible,
+    Offline
+}

RelayCore/Models/AuthAudits.cs

@@ -0,0 +1,14 @@
+using SurrealDb.Net.Models;
+
+namespace RelayCore.Models;
+
+public class AuthAudits : Record
+{
+    public required string UserId { get; set; }
+    public required int EventType { get; set; }
+    public bool Success { get; set; }
+    public required string IpAddress { get; set; }
+    public required string UserAgent { get; set; }
+    public required string Details { get; set; }
+    public required DateTime CreatedAt { get; set; }
+}

RelayCore/Models/Licenses.cs

@@ -0,0 +1,15 @@
+using SurrealDb.Net.Models;
+
+namespace RelayCore.Models;
+
+public class Licenses : Record
+{
+    public required string UserId { get; set; }
+    public required int LicenseType { get; set; }
+    public required int Status { get; set; }
+    public required DateTime CreatedAt { get; set; }
+    public required DateTime StartsAt { get; set; }
+    public required DateTime UpdatedAt { get; set; }
+    public required DateTime ExpiresAt { get; set; }
+    
+}

RelayCore/Models/PasswordHash.cs

@@ -0,0 +1,8 @@
+using SurrealDb.Net.Models;
+
+namespace RelayCore.Models;
+
+public class PasswordHash : Record
+{
+    public string? Password { get; set; }
+}

RelayCore/Models/PasswordHasher.cs

@@ -1,9 +1,8 @@
-using System;
 using System.Security.Cryptography;
 using System.Text;
 using Konscious.Security.Cryptography;
 
-namespace PasswordHasher
+namespace RelayCore.Models
 {
     /// <summary>
     /// Provides secure password hashing functionality using Argon2id algorithm
@@ -23,7 +22,7 @@ namespace PasswordHasher
         /// <summary>
         /// Number of threads to use for parallel computation
         /// </summary>
-        private const int DegreeOfParallelism = 1;
+        private const int DegreeOfParallelism = 2;
 
         /// <summary>
         /// Number of iterations for the Argon2id algorithm

RelayCore/Models/PasswordReset.cs

@@ -0,0 +1,12 @@
+using SurrealDb.Net.Models;
+
+namespace RelayCore.Models;
+
+public class PasswordReset : Record
+{
+    public required string UserId { get; set; }
+    public required string TokenHash { get; set; }
+    public required DateTime CreatedAt { get; set; }
+    public required DateTime ExpiresAt { get; set; }
+    public bool Revoked { get; set; }
+}

RelayCore/Models/Sessions.cs

@@ -0,0 +1,16 @@
+using SurrealDb.Net.Models;
+
+namespace RelayCore.Models;
+
+public class Sessions : Record
+{
+    public required RecordId UserId { get; set; }
+    public required string TokenHash { get; set; }
+    public required DateTime IssuedAt { get; set; }
+    public required DateTime ExpiresAt { get; set; }
+    public DateTime? LastUsedAt { get; set; }
+    public bool Revoked { get; set; }
+    public required string DeviceName { get; set; }
+    public required string IpAddress { get; set; }
+    public required string UserAgent { get; set; }
+}

RelayCore/Models/Users.cs

@@ -0,0 +1,18 @@
+using System.Text.Json.Serialization;
+using SurrealDb.Net.Models;
+
+namespace RelayCore.Models;
+
+public class Users : Record
+{
+    public required string Username { get; set; }
+    public string? Password { get; set; }
+    public required string Email { get; set; }
+    public required DateTime CreatedAt { get; set; }
+    public required DateTime UpdatedAt { get; set; }
+    public required DateTime LastLogin { get; set; }
+    public bool TwoFactorEnabled { get; set; }
+    public bool EmailVerified { get; set; }
+    public required int AccountStatus { get; set; }
+    public required int OnlineStatus { get; set; }
+}

RelayCore/Program.cs

@@ -1,91 +1,49 @@
-using SurrealDb.Net;
+using SurrealDb.Net;
-using SurrealDb.Net.Models;
 using SurrealDb.Net.Models.Auth;
 using System.Text.Json;
-using PasswordHasher;
+using System.Net;
-using RelayCore;
+using System.Text;
 
-using var db = new SurrealDbClient("ws://127.0.0.1:8000/rpc");
+using RelayCore.Enums;
+using RelayCore.Models;
+using RelayCore.Endpoints;
+using RelayCore.Services;
 
+
+await using var db = new SurrealDbClient("ws://127.0.0.1:8000/rpc");
 await db.SignIn(new RootAuth { Username = "root", Password = "secret" });
 await db.Use("test", "test");
 
 var keeper = await CreateUserAsync(db, "Keeper317", "Keeper317@gmail.com", "password");
 var kira = await CreateUserAsync(db, "Ru_Kira", "jduesling13@gmail.com", "password");
+var test = await CreateUserAsync(db, "Test", "test@gmail.com", "password");
+
+var server = new Program();
 
 Console.WriteLine($"Keeper created: {ToJsonString(keeper)}");
 Console.WriteLine($"Kira created: {ToJsonString(kira)}");
+Console.WriteLine($"Test created: {ToJsonString(test)}");
 
-var keeperKeys = E2EeHelper.GenerateRsaKeyPair();
+var builder = WebApplication.CreateBuilder(args);
-var kiraKeys = E2EeHelper.GenerateRsaKeyPair();
+builder.WebHost.UseUrls("http://127.0.0.1:1337/");
+// builder.WebHost.UseUrls("http://192.168.1.92:1337");
+builder.Services.AddSingleton(db);
+builder.Services.AddScoped<APIAuthService>();
 
-KeyStorage.SavePrivateKey("Keeper317", keeperKeys.privateKey);
+var app = builder.Build();
-KeyStorage.SavePrivateKey("Ru_Kira", kiraKeys.privateKey);
+app.MapGet("/",  () => "Auth Server Running!");
+app.MapAuthEndpoints();
 
-await db.Create("user_keys", new UserKeys
+// await server.Main(db);
-{
-    UserId = keeper.Id.ToString(),
-    PublicKey = keeperKeys.publicKey,
-    CreatedAt = DateTime.UtcNow,
-    UpdatedAt = DateTime.UtcNow
-});
 
-await db.Create("user_keys", new UserKeys
+await app.StartAsync();
-{
+Console.WriteLine("API Started");
-    UserId = kira.Id.ToString(),
+Console.WriteLine("\n\n\n");
-    PublicKey = kiraKeys.publicKey,
-    CreatedAt = DateTime.UtcNow,
-    UpdatedAt = DateTime.UtcNow
-});
 
-Console.WriteLine("Public keys stored for both users.");
+Console.Write("Press any key to stop.");
-
+Console.ReadKey(true);
-var conversation = await db.Create("conversations", new Conversations
-{
-    CreatedByUserId = keeper.Id.ToString(),
-    CreatedAt = DateTime.UtcNow,
-    UpdatedAt = DateTime.UtcNow,
-    Title = "Keeper317 + Ru_Kira",
-    IsDirectMessage = true
-});
-
-Console.WriteLine($"Conversation created: {ToJsonString(conversation)}");
-
-await db.Create("conversation_members", new ConversationMembers
-{
-    ConversationId = conversation.Id.ToString(),
-    UserId = keeper.Id.ToString(),
-    JoinedAt = DateTime.UtcNow
-});
-
-await db.Create("conversation_members", new ConversationMembers
-{
-    ConversationId = conversation.Id.ToString(),
-    UserId = kira.Id.ToString(),
-    JoinedAt = DateTime.UtcNow
-});
-
-Console.WriteLine("Conversation members added.");
-
-var encrypted = E2EeHelper.EncryptForRecipient("hello from Keeper317", kiraKeys.publicKey);
-
-var savedMessage = await db.Create("messages", new Messages
-{
-    ConversationId = conversation.Id.ToString(),
-    SenderUserId = keeper.Id.ToString(),
-    RecipientUserId = kira.Id.ToString(),
-    CipherText = encrypted.CipherText,
-    Nonce = encrypted.Nonce,
-    Tag = encrypted.Tag,
-    EncryptedKey = encrypted.EncryptedKey,
-    CreatedAt = DateTime.UtcNow
-});
-
-Console.WriteLine($"Encrypted message saved: {ToJsonString(savedMessage)}");
-
-var decrypted = E2EeHelper.DecryptForRecipient(encrypted, kiraKeys.privateKey);
-Console.WriteLine($"Decrypted for Ru_Kira: {decrypted}");
 
+await app.StopAsync();
 return;
 
 static string ToJsonString(object? o)
@@ -110,9 +68,9 @@ static async Task<Users> CreateUserAsync(SurrealDbClient db, string username, st
         OnlineStatus = (int)OnlineStatuses.Online,
     };
 
-    var created = await db.Create("users", user);
+    var created = await db.Create("auth_users", user);
 
-    var hasher = new PasswordHasher.PasswordHasher();
+    var hasher = new PasswordHasher();
     var passwordHash = hasher.HashPassword(created.Id.ToString() + rawPassword);
 
     var updated = await db.Merge<PasswordHash, Users>(new PasswordHash
@@ -124,175 +82,49 @@ static async Task<Users> CreateUserAsync(SurrealDbClient db, string username, st
     return updated;
 }
 
-public static class KeyStorage
+partial class Program
 {
-    public static void SavePrivateKey(string username, string privateKey)
+    public async Task Main(SurrealDbClient db)
     {
-        Directory.CreateDirectory("keys");
+        // Set up listener
-        File.WriteAllText(Path.Combine("keys", $"{username}.private.key"), privateKey);
+        using var listener = new HttpListener();
-    }
+        listener.Prefixes.Add("http://127.0.0.1:8080/");
+        listener.Start();
+        Console.WriteLine("API Started: http://127.0.0.1:8080/");
 
-    public static string LoadPrivateKey(string username)
+        while (true)
+        {
+            // Process requests
+            var context = await listener.GetContextAsync();
+            var req = context.Request;
+            var res = context.Response;
+
+            if (req.Url.AbsolutePath == "/api/hello" && req.HttpMethod == "GET")
+            {
+                var data = new { Message = "Hello, world!", Time = DateTime.Now };
+                byte[] buf = Encoding.UTF8.GetBytes(JsonSerializer.Serialize(data));
+                res.ContentType = "application/json";
+                await res.OutputStream.WriteAsync(buf, 0, buf.Length);
+            }
+
+            if (req.Url.AbsolutePath == "/api/users" && req.HttpMethod == "GET")
+            {
+                var data = new { Message = GetDBUsers(db).Result, Time = DateTime.Now };
+                byte[] buf = Encoding.UTF8.GetBytes(JsonSerializer.Serialize(data));
+                res.ContentType = "application/json";
+                await res.OutputStream.WriteAsync(buf, 0, buf.Length);
+            }
+            res.Close();
+        }
+    }
+    static async Task<Users[]> GetDBUsers(SurrealDbClient db)
+     {
+         var users = await db.Select<Users>("users");
+         Console.WriteLine(ToJsonString(users));
+         return users.ToArray();
+     }
+    static string ToJsonString(object? o)
     {
-        return File.ReadAllText(Path.Combine("keys", $"{username}.private.key"));
+        return JsonSerializer.Serialize(o, new JsonSerializerOptions { WriteIndented = true, });
     }
-
-    public static bool PrivateKeyExists(string username)
-    {
-        return File.Exists(Path.Combine("keys", $"{username}.private.key"));
-    }
-}
-
-public class ResponsibilityMerge : Record
-{
-    public bool Marketing { get; set; }
-}
-public class Group
-{
-    public bool Marketing { get; set; }
-    public int Count { get; set; }
-}
-
-public class Users : Record
-{
-    public required string Username { get; set; }
-    public string? Password { get; set; }
-    public required string Email { get; set; }
-    public required DateTime CreatedAt { get; set; }
-    public required DateTime UpdatedAt { get; set; }
-    public required DateTime LastLogin { get; set; }
-    public bool TwoFactorEnabled { get; set; }
-    public bool EmailVerified { get; set; }
-    public required int AccountStatus { get; set; }
-    public required int OnlineStatus { get; set; }
-}
-
-public class PasswordHash : Record
-{
-    public string? Password { get; set; }
-}
-
-public class Sessions : Record
-{
-    public required string UserId { get; set; }
-    public required string TokenHash { get; set; }
-    public required DateTime IssuedAt { get; set; }
-    public required DateTime ExpiresAt { get; set; }
-    public DateTime? LastUsedAt { get; set; }
-    public bool Revoked { get; set; }
-    public required string DeviceName { get; set; }
-    public required string IpAddress { get; set; }
-    public required string UserAgent { get; set; }
-}
-
-public class PasswordReset : Record
-{
-    public required string UserId { get; set; }
-    public required string TokenHash { get; set; }
-    public required DateTime CreatedAt { get; set; }
-    public required DateTime ExpiresAt { get; set; }
-    public bool Revoked { get; set; }
-}
-
-public class Licenses : Record
-{
-    public required string UserId { get; set; }
-    public required int LicenseType { get; set; }
-    public required int Status { get; set; }
-    public required DateTime CreatedAt { get; set; }
-    public required DateTime StartsAt { get; set; }
-    public required DateTime UpdatedAt { get; set; }
-    public required DateTime ExpiresAt { get; set; }
-    
-}
-
-public class AuthAudits : Record
-{
-    public required string UserId { get; set; }
-    public required int EventType { get; set; }
-    public bool Success { get; set; }
-    public required string IpAddress { get; set; }
-    public required string UserAgent { get; set; }
-    public required string Details { get; set; }
-    public required DateTime CreatedAt { get; set; }
-}
-
-public class UserKeys : Record
-{
-    public required string UserId { get; set; }
-    public required string PublicKey { get; set; }
-    public required DateTime CreatedAt { get; set; }
-    public required DateTime UpdatedAt { get; set; }
-}
-
-public class Conversations : Record
-{
-    public required string CreatedByUserId { get; set; }
-    public required DateTime CreatedAt { get; set; }
-    public required DateTime UpdatedAt { get; set; }
-    public string? Title { get; set; }
-    public bool IsDirectMessage { get; set; }
-}
-
-public class ConversationMembers : Record
-{
-    public required string ConversationId { get; set; }
-    public required string UserId { get; set; }
-    public required DateTime JoinedAt { get; set; }
-}
-
-public class Messages : Record
-{
-    public required string ConversationId { get; set; }
-    public required string SenderUserId { get; set; }
-    public required string RecipientUserId { get; set; }
-    public required string CipherText { get; set; }
-    public required string Nonce { get; set; }
-    public required string Tag { get; set; }
-    public required string EncryptedKey { get; set; }
-    public required DateTime CreatedAt { get; set; }
-}
-
-enum AccountStatuses
-{
-    Active,
-    Suspended,
-    Banned,
-    Deleted
-}
-
-enum OnlineStatuses
-{
-    Online,
-    Busy,
-    DND,
-    Invisible,
-    Offline
-}
-
-enum LicenseStatuses
-{
-    Active,
-    Expired,
-    Renewable,
-    Revoked
-}
-
-enum LicenseType
-{
-    Free,
-    Basic,
-    Advanced,
-    Pro,
-    Enterprise
-}
-
-enum LogEvents
-{
-    LoginSuccess,
-    LoginFailure,
-    LogoutSuccess,
-    LogoutFailure,
-    PasswordResetSuccess,
-    PasswordResetFailure,
 }

RelayCore/RelayCore.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk.Web">
 
     <PropertyGroup>
         <OutputType>Exe</OutputType>
@@ -10,7 +10,12 @@
 
     <ItemGroup>
       <PackageReference Include="Konscious.Security.Cryptography.Argon2" Version="1.3.1" />
+      <PackageReference Include="Microsoft.AspNetCore.SignalR" Version="1.2.9" />
       <PackageReference Include="SurrealDb.Net" Version="0.9.0" />
     </ItemGroup>
 
+    <ItemGroup>
+      <ProjectReference Include="..\RelayShared\RelayShared.csproj" />
+    </ItemGroup>
+
 </Project>

RelayCore/Services/APIAuthService.cs

@@ -0,0 +1,126 @@
+using Microsoft.AspNetCore.WebUtilities;
+using Newtonsoft.Json;
+using RelayCore.Endpoints;
+using RelayCore.Enums;
+using RelayCore.Models;
+using RelayShared.Services;
+using SurrealDb.Net;
+using SurrealDb.Net.Models;
+
+namespace RelayCore.Services;
+
+public class APIAuthService(SurrealDbClient _db)
+{
+    public async Task<List<Users>> GetUsersAsync()
+    {
+        var users = await _db.Select<Users>("auth_users");
+        return users.Where(x => x.Username is not null).OrderByDescending(x=>x.CreatedAt).ToList();
+    }
+    public async Task<string?> UserSigninAsync(AuthSignin request, string ip,  string  userAgent)
+    {
+        var hasher = new PasswordHasher();
+        var users = await _db.Select<Users>("auth_users");
+        var user = users.FirstOrDefault(x => (x.Username.ToLower() == request.UserName.ToLower() ||
+                                                            x.Email.ToLower() == request.UserName.ToLower()) &&
+                                                            hasher.VerifyPassword(x.Id + request.Password, x.Password));
+        if (user == null)
+            return null;
+        var tokens = await _db.Select<Sessions>("auth_sessions");
+        var token = tokens.Where(x => x.UserId == user.Id && x.IpAddress == ip && x.UserAgent == userAgent && !x.Revoked)
+                                    .OrderByDescending(x => x.ExpiresAt).FirstOrDefault();
+        if (token != null)
+            if (token.ExpiresAt > DateTime.UtcNow)
+                return token.TokenHash;
+        
+        //TODO: Generate TOKEN
+        var newToken = hasher.HashPassword($"{request.UserName}{userAgent}");
+        //TODO: Store TOKEN and Username for verification
+        var sessionId = await _db.Create("auth_sessions", new Sessions
+        {
+            UserId = user.Id,
+            TokenHash = newToken,
+            IssuedAt = DateTime.UtcNow,
+            ExpiresAt = DateTime.UtcNow.AddDays(30),
+            DeviceName = "",
+            Revoked = false,
+            IpAddress = ip,
+            UserAgent = userAgent
+        });
+        //TODO: Add invalidation to TOKENs
+        return newToken;
+    }
+    public async Task<string?> UserRegisterAsync(AuthRegister request, string ip, string userAgent)
+    {
+        var hasher = new PasswordHasher();
+        var users = await _db.Select<Users>("auth_users");
+        var user = users.FirstOrDefault(x => x.Username.ToLower() == request.Username.ToLower() || x.Email.ToLower() == request.Email.ToLower());
+        if (user == null)
+        {
+            var now = DateTime.Now;
+            var created =  await _db.Create("auth_users", new Users
+            {
+                Username = request.Username,
+                Email = request.Email,
+                CreatedAt = now,
+                UpdatedAt = now,
+                LastLogin = now,
+                TwoFactorEnabled = false,
+                EmailVerified = false,
+                AccountStatus = (int)AccountStatuses.Active,
+                OnlineStatus = (int)OnlineStatuses.Online,
+                
+            });
+            var passwordHash = hasher.HashPassword(created.Id + request.Password);
+            await _db.Merge<PasswordHash, Users>(new PasswordHash
+            {
+                Id = created.Id,
+                Password = passwordHash
+            });
+            
+           return await UserSigninAsync(new AuthSignin{UserName=request.Username, Password = request.Password}, ip, userAgent);
+        }
+
+        return null;
+    }
+
+    public async Task<bool> ServerVerifyUser(AuthUserVerify request)
+    {
+        var users = await _db.Select<Users>("auth_users");
+        var user = users.FirstOrDefault(x => x.Username == request.Username);
+
+        if (user == null)
+            return false;
+        
+        var sessions = await _db.Select<Sessions>("auth_sessions");
+        var session = sessions.FirstOrDefault(x => x.TokenHash == request.Token && x.UserId == user.Id);
+        if (session == null)
+            return false;
+
+        return true;
+    }
+
+    public async Task<string?> ServerLicenseGenerate(AuthServerLicenseGenerate request)
+    {
+        var hasher = new PasswordHasher();
+        string token = null;
+        token = hasher.HashPassword(DateTime.Now.ToString("yyyyMMddHHmmss"));
+        var created = await _db.Create("auth_licenses", new DBLicense
+        {
+            Token = token,
+            IsClient =  false,
+            CreatedAt = DateTime.UtcNow,
+            ExpiresAt = DateTime.UtcNow.AddDays(365),
+            IsExpired = false,
+        });
+        return token;
+    }
+
+    public async Task<bool> ServerVerifyLicense(AuthServerLicenseVerify request)
+    {
+        var tokens = await _db.Select<DBLicense>("auth_licenses");
+        var token = tokens.FirstOrDefault(x => x.Token == request.License);
+        if (token != null)
+            return true;
+        return false;
+    }
+}

RelayServer/.gitignore

@@ -79,6 +79,7 @@ keys/*
 ############################################
 
 data/
+!Services/Data/
 *.db
 *.sqlite
 *.sqlite3

RelayServer/Endpoints/RtcEndpoints.cs

@@ -0,0 +1,141 @@
+using System.Text.Json;
+using RelayShared.Rtc;
+using RelayServer.Services.Rtc;
+using RelayShared.Services;
+
+namespace RelayServer.Endpoints;
+
+public static class RtcEndpoints
+{
+    /// <summary>
+    /// Maps all RTC-related HTTP endpoints used for storing offers and answers,
+    /// writing ICE candidates, checking active calls, and leaving active calls.
+    /// </summary>
+    /// <param name="app">The web application to map endpoints onto.</param>
+    public static void MapRtcEndpoints(this WebApplication app)
+    {
+        // Store or update the current SDP offer for a channel call.
+        app.MapPost("/api/rtc/offer", async (RtcOffer request, RtcCallService rtcCallService) =>
+        {
+            await rtcCallService.WriteOfferAsync(request.ChannelId, request.Username, request.SessionDescription);
+
+            RtcNotificationService.BroadcastToChannel(new RtcNotificationMessage
+            {
+                Type = SignalType.OfferUpdated,
+                ChannelId = request.ChannelId,
+                Username = request.Username
+            });
+
+            return Results.Ok();
+        });
+
+        // List all offers.
+        app.MapGet("/api/rtc/offers", async (RtcCallService rtcCallService) =>
+        {
+            return Results.Ok(await rtcCallService.GetOffersAsync());
+        });
+
+        // Return whether the specified channel currently has an active call.
+        app.MapGet("/api/rtc/active/{channelId}", async (string channelId, RtcCallService rtcCallService) =>
+        {
+            return Results.Ok(await rtcCallService.HasActiveCallAsync(channelId));
+        });
+
+        // Return the latest stored SDP offer for the specified channel.
+        app.MapGet("/api/rtc/offers/{channelId}", async (string channelId, RtcCallService rtcCallService) =>
+        {
+            var offer = await rtcCallService.GetOfferAsync(channelId);
+            return offer is null ? Results.NotFound() : Results.Ok(offer);
+        });
+
+        // Store a new SDP answer for the specified channel call.
+        app.MapPost("/api/rtc/answer", async (RtcOffer request, RtcCallService rtcCallService) =>
+        {
+            Console.WriteLine($"RTC answer received for channel {request.ChannelId} from {request.Username}");
+
+            await rtcCallService.WriteAnswerAsync(request.ChannelId, request.SessionDescription);
+
+            Console.WriteLine($"Broadcasting rtc_answer_updated for {request.ChannelId}");
+
+            RtcNotificationService.BroadcastToChannel(new RtcNotificationMessage
+            {
+                Type = SignalType.AnswerUpdated,
+                ChannelId = request.ChannelId
+            });
+
+            return Results.Ok();
+        });
+
+        // Return all answers stored for the specified channel.
+        app.MapGet("/api/rtc/answers/{channelId}", async (string channelId, RtcCallService rtcCallService) =>
+        {
+            return Results.Ok(await rtcCallService.GetAnswersAsync(channelId));
+        });
+        
+        app.MapGet("/api/rtc/participants/{channelId}", (string channelId) =>
+        {
+            return Results.Ok(RtcChannelPresenceService.GetUsersInChannel(channelId));
+        });
+
+        // Return the latest answer stored for the specified channel.
+        app.MapGet("/api/rtc/answer/{channelId}", async (string channelId, RtcCallService rtcCallService) =>
+        {
+            var answer = await rtcCallService.GetLatestAnswerAsync(channelId);
+            return answer is null ? Results.NotFound() : Results.Ok(answer);
+        });
+
+        // Store a new ICE candidate for the specified channel call.
+        app.MapPost("/api/rtc/candidate", async (RtcIceCandidate request, RtcCallService rtcCallService) =>
+        {
+            await rtcCallService.WriteIceCandidateAsync(
+                request.ChannelId,
+                request.Username,
+                request.Candidate.candidate,
+                request.Candidate.sdpMid,
+                request.Candidate.sdpMLineIndex
+            );
+
+            RtcNotificationService.BroadcastToChannel(new RtcNotificationMessage
+            {
+                Type = SignalType.CandidateAdded,
+                ChannelId = request.ChannelId,
+                Username = request.Username,
+                Direction = JsonSerializer.Serialize(request.Candidate)
+            });
+
+            return Results.Ok();
+        });
+
+        // Return all ICE candidates stored for the specified channel.
+        app.MapGet("/api/rtc/candidates/{channelId}", async (string channelId, RtcCallService rtcCallService) =>
+        {
+            return Results.Ok(await rtcCallService.GetIceCandidatesAsync(channelId));
+        });
+
+        // Return ICE candidates for the specified channel that belong to other users
+        // and match the requested direction.
+        app.MapGet("/api/rtc/candidates/{channelId}/{username}/{direction}", async (
+            string channelId,
+            string username,
+            string direction,
+            RtcCallService rtcCallService) =>
+        {
+            return Results.Ok(await rtcCallService.GetIceCandidatesForOthersAsync(channelId, username, direction));
+        });
+
+        // Leave the active call for the specified channel.
+        app.MapPost("/api/rtc/leave", async (RtcLeaveRequest request, RtcCallService rtcCallService) =>
+        {
+            await rtcCallService.LeaveCallAsync(request.ChannelId, request.Username);
+
+            RtcNotificationService.BroadcastToChannel(new RtcNotificationMessage
+            {
+                Type = SignalType.CallLeft,
+                ChannelId = request.ChannelId,
+                Username = request.Username
+            });
+
+            return Results.Ok();
+        });
+    }
+}

RelayServer/Models/Chat/ChannelMessageEdits.cs

@@ -0,0 +1,25 @@
+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models;
+
+/// <summary>
+/// Surreal record for the `channel_message_edits` table. One row per historical version of
+/// an edited message — written by HandleEditMessage BEFORE overwriting the live row.
+///
+/// Encrypted with the channel AES key (same as ChannelMessages), so HandleGetEditHistory
+/// can decrypt + re-encrypt per requester.
+/// </summary>
+public class ChannelMessageEdits : Record
+{
+    /// <summary>"channel_messages:abc" — which live message this version belonged to.</summary>
+    public required string MessageId { get; set; }
+
+    /// <summary>Base64 AES-GCM ciphertext of the JSON-serialised previous ChatMessageContent.</summary>
+    public required string CipherText { get; set; }
+
+    public required string Nonce { get; set; }
+    public required string Tag { get; set; }
+
+    /// <summary>When this version was the current text (i.e. when it was replaced).</summary>
+    public required DateTime EditedAt { get; set; }
+}

RelayServer/Models/Chat/ChannelMessages.cs

@@ -0,0 +1,37 @@
+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models;
+
+/// <summary>
+/// Surreal record for the `channel_messages` table. One row per message.
+///
+/// Encryption: CipherText/Nonce/Tag use the channel AES key (ChannelDbKey), NOT any user's
+/// RSA keypair. This means the server can decrypt for history queries; the per-recipient
+/// RSA wrapping happens at delivery time in DeliverToServerMembers.
+/// </summary>
+public class ChannelMessages : Record
+{
+    /// <summary>"channels:xyz" — which channel this belongs to.</summary>
+    public required string ChannelId { get; set; }
+
+    /// <summary>"users:keeper317" — who wrote it. Lowercased to match CoreClientService's id format.</summary>
+    public required string SenderUserId { get; set; }
+
+    /// <summary>Base64 AES-GCM ciphertext of the JSON-serialised ChatMessageContent.</summary>
+    public required string CipherText { get; set; }
+
+    /// <summary>Base64 AES-GCM 96-bit nonce. Different every message.</summary>
+    public required string Nonce { get; set; }
+
+    /// <summary>Base64 AES-GCM 128-bit authentication tag.</summary>
+    public required string Tag { get; set; }
+
+    /// <summary>UTC timestamp of original send. Drives history ordering.</summary>
+    public required DateTime CreatedAt { get; set; }
+
+    /// <summary>UTC timestamp of last edit. Null = never edited. Drives the (edited) bubble footer.</summary>
+    public DateTime? EditedAt { get; set; }
+
+    /// <summary>Soft-delete flag. Tombstones in history responses; bubbles show "deleted" placeholder.</summary>
+    public bool IsDeleted { get; set; }
+}

RelayServer/Models/Chat/Channels.cs

@@ -0,0 +1,40 @@
+using SurrealDb.Net.Models;
+using RelayShared.Services;
+
+namespace RelayServer.Models;
+
+/// <summary>
+/// Surreal record for the `channels` table. One row per channel.
+///
+/// Lifecycle: created by HandleCreateChannel (or seeded by ServerBootstrapService at boot).
+/// Soft-deleted by HandleDeleteChannel (IsDeleted flipped, row stays for audit).
+/// </summary>
+public class Channels : Record
+{
+    /// <summary>Sidebar display name. Lowercased and dash-separated for new channels.</summary>
+    public required string Name { get; set; }
+
+    /// <summary>Creation timestamp. Drives sidebar sort order.</summary>
+    public required DateTime CreatedAt { get; set; }
+
+    /// <summary>Drives client rendering and server routing — Text/Voice/File/Forum/Stage.</summary>
+    public ChannelType Type { get; set; } = ChannelType.Text;
+
+    /// <summary>Sidebar category header (e.g. "General"). Empty means default group.</summary>
+    public string Group { get; set; } = string.Empty;
+
+    /// <summary>
+    /// True for announcement-style channels (#welcome, #files). Non-admins are blocked from
+    /// posting via PermissionService.CanSendMessagesAsync.
+    /// </summary>
+    public bool IsReadOnly { get; set; }
+
+    /// <summary>Soft-delete flag. Filtered out of channel-list builds in BuildChannelListForUser.</summary>
+    public bool IsDeleted { get; set; }
+
+    /// <summary>
+    /// Surreal record id of a File channel ("channels:xyz"). When set, ChatSocketBehavior's
+    /// MirrorAttachmentIfNeeded auto-copies non-gif attachments into the linked channel.
+    /// </summary>
+    public string? LinkedFileChannelId { get; set; }
+}

RelayServer/Models/Chat/SocketChannelInfo.cs

@@ -0,0 +1,8 @@
+namespace RelayServer.Models;
+
+public class SocketChannelInfo
+{
+    public required string ChannelId { get; set; }
+    public required string Name { get; set; }
+    public required DateTime CreatedAt { get; set; }
+}

RelayServer/Models/Crypto/ClientPublicKeys.cs

@@ -0,0 +1,26 @@
+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models;
+
+/// <summary>
+/// Surreal record for the `client_public_keys` table. Stores the RSA public key each user
+/// has registered. Written by HandleRegisterKey, read by DeliverToServerMembers and history
+/// fetches to encrypt outbound messages per recipient.
+///
+/// When a client reinstalls and regenerates a keypair, the existing row is updated rather
+/// than duplicated (ClientKeyService.RegisterOrUpdateKeyAsync).
+/// </summary>
+public class ClientPublicKeys : Record
+{
+    /// <summary>Mixed-case username as the user registered it. Used as the lookup key.</summary>
+    public required string Username { get; set; }
+
+    /// <summary>Base64 SubjectPublicKeyInfo (DER) of the user's RSA public key.</summary>
+    public required string PublicKey { get; set; }
+
+    /// <summary>When the user first registered.</summary>
+    public required DateTime CreatedAt { get; set; }
+
+    /// <summary>When the key was last updated (key rotation, reinstall).</summary>
+    public required DateTime UpdatedAt { get; set; }
+}

RelayServer/Models/Crypto/ServerEncryptionKeys.cs

@@ -0,0 +1,29 @@
+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models;
+
+/// <summary>
+/// Surreal record for the `server_encryption_keys` table. Stores both:
+///   - The server's RSA keypair (for receiving encrypted client→server payloads).
+///   - The single AES-256 key used to encrypt channel_messages at rest.
+///
+/// Generated once on first boot by ServerBootstrapService. Loaded into static fields on
+/// ChatSocketBehavior at boot so handlers can use them without a DB round-trip.
+/// </summary>
+public class ServerEncryptionKeys : Record
+{
+    /// <summary>Base64 AES-256 key used by ChannelCryptoService for at-rest message encryption.</summary>
+    public required string KeyBase64 { get; set; }
+
+    /// <summary>Base64 SubjectPublicKeyInfo of the server's RSA public key. Sent to clients on GetServerKey.</summary>
+    public required string PublicKey { get; set; }
+
+    /// <summary>Base64 PKCS8 of the server's RSA private key. Never leaves the server.</summary>
+    public required string PrivateKey { get; set; }
+
+    /// <summary>When the keys were generated.</summary>
+    public required DateTime CreatedAt { get; set; }
+
+    /// <summary>When the keys were last rotated. Currently same as CreatedAt — rotation isn't implemented.</summary>
+    public required DateTime UpdatedAt { get; set; }
+}

RelayServer/Models/Server/ChannelPermissions.cs

@@ -0,0 +1,25 @@
+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models;
+
+/// <summary>
+/// Surreal record for the `channel_permissions` table. Per-(channel, role) override of a
+/// role's base permissions.
+///
+/// Allow and Deny are independent masks (NOT a tri-state). Deny wins over Allow when both
+/// have the same flag set. Bits not set in either fall through to the role's base permissions.
+/// </summary>
+public class ChannelPermissions : Record
+{
+    /// <summary>"channels:xyz" — which channel this override applies in.</summary>
+    public required string ChannelId { get; set; }
+
+    /// <summary>"roles:abc" — which role this override applies to.</summary>
+    public required string RoleId { get; set; }
+
+    /// <summary>Permissions explicitly granted here (overrides "role doesn't have it" for this channel).</summary>
+    public PermissionFlags Allow { get; set; }
+
+    /// <summary>Permissions explicitly denied here. Wins over Allow.</summary>
+    public PermissionFlags Deny { get; set; }
+}

RelayServer/Models/Server/Roles.cs

@@ -0,0 +1,50 @@
+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models;
+
+/// <summary>
+/// The permission bitfield. The whole permission model is just:
+///
+///   ServerMembers.IsOwner = true                 → unconditional Administrator
+///   roles.Permissions has Administrator flag     → unconditional everything
+///   channel_permissions.Deny has a specific flag → that permission denied here
+///   channel_permissions.Allow has a specific flag → that permission allowed here
+///   roles.Permissions has the flag               → fallback (channel-independent)
+///
+/// PermissionService.HasPermissionAsync walks that ladder in order. See that class for the
+/// authoritative implementation.
+/// </summary>
+[Flags]
+public enum PermissionFlags
+{
+    None              = 0,
+    ReadMessages      = 1 << 0,
+    SendMessages      = 1 << 1,
+    ManageMessages    = 1 << 2,  // Edit / delete others' messages
+    ManageChannels    = 1 << 3,  // Create channels (umbrella manage permission)
+    ManageMembers     = 1 << 4,  // Kick / ban members
+    Administrator     = 1 << 5,  // All permissions, bypasses channel overrides
+    ViewChannel       = 1 << 6,  // "Visibility" — can see the channel at all
+    Speak             = 1 << 7,  // Can transmit in a voice channel
+    EditChannel       = 1 << 8,  // Rename / reconfigure a channel
+    DeleteChannel     = 1 << 9   // Delete a channel
+}
+
+/// <summary>
+/// Surreal record for the `roles` table. Defines a named permission bundle that can be
+/// assigned to users via UserRoles.
+/// </summary>
+public class Roles : Record
+{
+    /// <summary>Display name ("Admin", "Moderator", "Member").</summary>
+    public required string Name { get; set; }
+
+    /// <summary>Base permission bitfield. Channel-level overrides in ChannelPermissions can add or remove.</summary>
+    public required PermissionFlags Permissions { get; set; }
+
+    /// <summary>When the role was seeded.</summary>
+    public required DateTime CreatedAt { get; set; }
+
+    /// <summary>Tie-breaker for future multi-role-per-user scenarios. Lower = higher priority. Not used by the current ladder.</summary>
+    public int Priority { get; set; }
+}

RelayServer/Models/Server/ServerMembers.cs

@@ -0,0 +1,23 @@
+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models;
+
+/// <summary>
+/// Surreal record for the `server_members` table. Membership list.
+/// Drives DeliverToServerMembers (the fan-out target list for every chat message) and the
+/// authoritative ownership flag for PermissionService.
+/// </summary>
+public class ServerMembers : Record
+{
+    /// <summary>"users:keeper317" — references the Core users table by name convention.</summary>
+    public required string UserId { get; set; }
+
+    /// <summary>When the user was added to this server.</summary>
+    public required DateTime JoinedAt { get; set; }
+
+    /// <summary>
+    /// Authoritative owner flag. Owner gets unconditional Administrator via
+    /// PermissionService.IsServerOwnerAsync, independent of role assignments.
+    /// </summary>
+    public bool IsOwner { get; set; }
+}

RelayServer/Models/Server/Servers.cs

@@ -0,0 +1,19 @@
+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models;
+
+/// <summary>
+/// Surreal record for the `servers` table. Currently single-row (one server per deployment),
+/// but the schema supports multi-server in the future.
+/// </summary>
+public class Servers : Record
+{
+    /// <summary>Display name (currently "Test Server" from bootstrap).</summary>
+    public required string Name { get; set; }
+
+    /// <summary>"users:keeper317" — the owner. Mirrored as IsOwner=true on the matching ServerMembers row.</summary>
+    public required string OwnerUserId { get; set; }
+
+    /// <summary>Server creation timestamp.</summary>
+    public required DateTime CreatedAt { get; set; }
+}

RelayServer/Models/Server/UserRoles.cs

@@ -0,0 +1,22 @@
+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models;
+
+/// <summary>
+/// Surreal record for the `user_roles` table. Join table linking users to roles.
+///
+/// Invariant: ServerBootstrapService.SetUserRoleAsync guarantees exactly one row per user.
+/// Multi-role-per-user isn't currently supported by the permission ladder — adding it would
+/// just be a matter of removing the bootstrap's "delete stale rows" step.
+/// </summary>
+public class UserRoles : Record
+{
+    /// <summary>"users:keeper317" — the assignee.</summary>
+    public required string UserId { get; set; }
+
+    /// <summary>"roles:abc" — the role being granted.</summary>
+    public required string RoleId { get; set; }
+
+    /// <summary>When the assignment was made.</summary>
+    public required DateTime AssignedAt { get; set; }
+}

RelayServer/Program.cs

@@ -1 +1,72 @@
-Console.WriteLine("Hello, World!");
+// =============================================================================
+// RelayServer entrypoint.
+//
+// Boot sequence:
+//   1. Connect to SurrealDB (port 8000) via SurrealService.
+//   2. Wire static singletons onto ChatSocketBehavior (it's a WebSocketSharp
+//      WebSocketBehavior, so DI is impossible — fields are static).
+//   3. Run ServerBootstrapService.InitializeAsync — seeds users, server, members,
+//      channels (welcome, general, files, voice-general), roles, role assignments,
+//      channel permission overrides, and encryption keys. Idempotent across reboots.
+//   4. Start two listeners in parallel:
+//        - HTTP API on 127.0.0.1:5000 (RtcEndpoints — REST for RTC call orchestration)
+//        - WebSocket server on 127.0.0.1:5001 (ChatSocketBehavior — the chat/RTC-signal pipe)
+//   5. Block on ConsoleCommandService.ShutdownTokenSource for graceful shutdown.
+//
+// Why two listeners? The HTTP API is used for one-shot RPC-style calls (e.g. "fetch
+// the participant list for this voice channel"). The WebSocket is the persistent
+// duplex pipe used for chat, typing, presence, encrypted RTC signalling.
+// =============================================================================
+
+using RelayServer.Endpoints;
+using RelayServer.Services.Chat;
+using RelayServer.Services.Core;
+using RelayServer.Services.Data;
+using RelayServer.Services.Rtc;
+using RelayShared.Rtc;
+using RelayShared.Services;
+using WebSocketSharp.Server;
+
+var surrealService = new SurrealService();
+var coreClient = new CoreClientService();
+var cryptoService = new ChannelCryptoService();
+
+await using var db = await surrealService.ConnectAsync();
+
+ChatSocketBehavior.ClientKeyService = new ClientKeyService(db);
+ChatSocketBehavior.PermissionService = new PermissionService(db);
+ChatSocketBehavior.Db = db;
+ChatSocketBehavior.ChannelCryptoService = cryptoService;
+
+var bootstrapService = new ServerBootstrapService(db, coreClient, cryptoService);
+await bootstrapService.InitializeAsync();
+
+var builder = WebApplication.CreateBuilder(args);
+builder.WebHost.UseUrls("http://127.0.0.1:5000/");
+// builder.WebHost.UseUrls("http://192.168.1.92:5000/");
+
+builder.Services.AddSingleton(db);
+builder.Services.AddScoped<RtcCallService>();
+
+var app = builder.Build();
+
+app.MapGet("/", () => "Server Running!");
+app.MapRtcEndpoints();
+
+var wssv = new WebSocketServer("ws://127.0.0.1:5001");
+// var wssv = new WebSocketServer("ws://192.168.1.92:5001");
+wssv.AddWebSocketService<ChatSocketBehavior>("/");
+RtcNotificationService.Server = wssv;
+
+wssv.Start();
+Console.WriteLine("WebSocket server started");
+
+await app.StartAsync();
+Console.WriteLine("HTTP API started");
+
+ConsoleCommandService.Start();
+await Task.Delay(Timeout.Infinite, ConsoleCommandService.ShutdownTokenSource.Token);
+
+wssv.Stop();
+await app.StopAsync();
+return;

RelayServer/RelayServer.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk.Web">
 
     <PropertyGroup>
         <OutputType>Exe</OutputType>
@@ -7,4 +7,14 @@
         <Nullable>enable</Nullable>
     </PropertyGroup>
 
+    <ItemGroup>
+      <PackageReference Include="Microsoft.AspNetCore.SignalR" Version="1.2.9" />
+      <PackageReference Include="SurrealDb.Net" Version="0.9.0" />
+      <PackageReference Include="WebSocketSharp" Version="1.0.3-rc11" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\RelayShared\RelayShared.csproj" />
+    </ItemGroup>
+
 </Project>

RelayServer/Services/Chat/ChannelCryptoService.cs

@@ -0,0 +1,63 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace RelayServer.Services.Chat;
+
+/// <summary>
+/// AES-GCM-256 only (no RSA). Used exclusively for "at-rest" encryption of channel messages
+/// in the SurrealDB channel_messages table.
+///
+/// Why a separate service from E2EeHelper:
+///   - E2EeHelper is for *transit* between a specific sender and a specific recipient — it
+///     wraps an ephemeral AES key with the recipient's RSA public key.
+///   - ChannelCryptoService is for *storage* — the server is both the encryptor and the
+///     decryptor, and it stores the symmetric channel key in server_encryption_keys.KeyBase64.
+///     There's no recipient to wrap for.
+///
+/// Server flow for a chat message:
+///   incoming SocketEncryptedMessage  (encrypted with server's RSA public key, by client)
+///     → E2EeHelper.DecryptForRecipient(serverPrivateKey) → plaintext
+///     → ChannelCryptoService.Encrypt(channelDbKey)       → stored ciphertext
+///     → … later, on history fetch …
+///     → ChannelCryptoService.Decrypt(channelDbKey)       → plaintext
+///     → E2EeHelper.EncryptForRecipient(clientPublicKey)  → delivered ciphertext
+/// </summary>
+public sealed class ChannelCryptoService
+{
+    public string GenerateKey()
+    {
+        return Convert.ToBase64String(RandomNumberGenerator.GetBytes(32));
+    }
+
+    public (string cipherText, string nonce, string tag) Encrypt(string plainText, string keyBase64)
+    {
+        var key = Convert.FromBase64String(keyBase64);
+        var nonce = RandomNumberGenerator.GetBytes(12);
+        var plainBytes = Encoding.UTF8.GetBytes(plainText);
+        var cipherBytes = new byte[plainBytes.Length];
+        var tag = new byte[16];
+
+        using var aes = new AesGcm(key, 16);
+        aes.Encrypt(nonce, plainBytes, cipherBytes, tag);
+
+        return (
+            Convert.ToBase64String(cipherBytes),
+            Convert.ToBase64String(nonce),
+            Convert.ToBase64String(tag)
+        );
+    }
+
+    public string Decrypt(string cipherTextBase64, string nonceBase64, string tagBase64, string keyBase64)
+    {
+        var key = Convert.FromBase64String(keyBase64);
+        var nonce = Convert.FromBase64String(nonceBase64);
+        var tag = Convert.FromBase64String(tagBase64);
+        var cipherBytes = Convert.FromBase64String(cipherTextBase64);
+        var plainBytes = new byte[cipherBytes.Length];
+
+        using var aes = new AesGcm(key, 16);
+        aes.Decrypt(nonce, cipherBytes, tag, plainBytes);
+
+        return Encoding.UTF8.GetString(plainBytes);
+    }
+}

RelayServer/Services/Chat/ChatSocketBehavior.cs

@@ -0,0 +1,915 @@
+using System.Net.Http.Headers;
+using System.Text.Json;
+using RelayServer.Models;
+using RelayServer.Services.Crypto;
+using RelayServer.Services.Data;
+using RelayServer.Services.Rtc;
+using WebSocketSharp;
+using WebSocketSharp.Server;
+using ErrorEventArgs = WebSocketSharp.ErrorEventArgs;
+using RelayShared.Services;
+
+namespace RelayServer.Services.Chat;
+
+/// <summary>
+/// The server-side WebSocket endpoint. Every client connection creates one instance of this
+/// class. WebSocketSharp owns the lifecycle: it constructs the behavior, calls OnMessage for
+/// each incoming frame, and calls OnClose when the connection drops.
+///
+/// MESSAGE FLOW (data plane — chat message):
+///   1. Client sends a SocketEncryptedMessage with SignalType.ClientEncryptedChat.
+///      Payload is JSON-serialised ChatMessageContent, encrypted with the server's public key.
+///   2. OnMessage parses the JSON, identifies Type, routes to HandleEncryptedChatMessage.
+///   3. Permission check via PermissionService.CanSendMessagesAsync.
+///   4. Decrypt with ServerPrivateKey → get plaintext JSON.
+///   5. Re-encrypt with ChannelDbKey (AES-GCM only, no RSA) → store in channel_messages table.
+///   6. For each connected server member: re-encrypt with their client public key, deliver
+///      via Sessions.SendTo to every one of their active sessions (multi-device).
+///   7. If the origin channel has LinkedFileChannelId set, MirrorAttachmentIfNeeded also
+///      stores+delivers a trimmed copy into the linked File channel.
+///
+/// MESSAGE FLOW (control plane — e.g. CreateChannel):
+///   1. Client sends a WsControlMessage with Action=CreateChannel.
+///   2. OnMessage sees the "Action" JSON property, routes via DispatchControl.
+///   3. Permission check, DB write, then BroadcastChannelList rebuilds the channel list per
+///      user (because CanPost/CanManage are computed per-user) and pushes it to everyone.
+///
+/// STATE STORES used here:
+///   - ConnectedClientService: session ↔ username mapping (in-memory, multi-device aware).
+///     Populated by HandleRegisterKey, cleared by OnClose.
+///   - RtcChannelPresenceService: session ↔ voice channel mapping. Populated by RtcJoin,
+///     cleared by RtcLeave / OnClose.
+///   - SurrealDB tables: channel_messages, channels, server_members, roles, user_roles,
+///     channel_permissions, client_public_keys, server_encryption_keys, channel_message_edits.
+///
+/// CRITICAL invariant: this class is constructed by WebSocketSharp and has no constructor
+/// hook for DI, so ALL services are static (set once by Program.cs at boot).
+/// </summary>
+public class ChatSocketBehavior : WebSocketBehavior
+{
+    /// <summary>Reads/writes the client_public_keys table. Wired by Program.cs at boot.</summary>
+    public static ClientKeyService? ClientKeyService { get; set; }
+
+    /// <summary>The permission ladder evaluator. Wired by Program.cs at boot.</summary>
+    public static PermissionService? PermissionService { get; set; }
+
+    /// <summary>Base64 RSA public key — clients use this to encrypt outbound payloads to the server.</summary>
+    public static string? ServerPublicKey { get; set; }
+
+    /// <summary>Base64 RSA private key — used to decrypt inbound payloads. Never leaves the server.</summary>
+    public static string? ServerPrivateKey { get; set; }
+
+    /// <summary>Base64 AES-256 key for at-rest encryption of channel_messages.CipherText rows.</summary>
+    public static string? ChannelDbKey { get; set; }
+
+    /// <summary>AES-GCM-only encryption for stored messages. Wired by Program.cs at boot.</summary>
+    public static ChannelCryptoService? ChannelCryptoService { get; set; }
+
+    /// <summary>The SurrealDB connection. Wired by Program.cs at boot.</summary>
+    public static SurrealDb.Net.SurrealDbClient? Db { get; set; }
+
+    /// <summary>
+    /// WebSocketSharp callback fired for every incoming text frame. Peeks the JSON to identify
+    /// "Action" (control-plane) vs "Type" (data-plane), then routes to the right handler.
+    /// All exceptions are caught and logged — they MUST NOT propagate or WebSocketSharp will
+    /// drop the connection.
+    /// </summary>
+    protected override void OnMessage(MessageEventArgs e)
+    {
+        var msg = e.Data;
+
+        try
+        {
+            using var doc = JsonDocument.Parse(msg);
+            var root = doc.RootElement;
+
+            if (root.TryGetProperty("Action", out var actionProp))
+            {
+                var action = (WsAction)actionProp.GetInt32();
+                var control = JsonSerializer.Deserialize<WsControlMessage>(msg)!;
+                DispatchControl(action, control);
+                return;
+            }
+
+            if (root.TryGetProperty("Type", out var typeProp))
+            {
+                var type = (SignalType)typeProp.GetInt32();
+                switch (type)
+                {
+                    case SignalType.EncryptedSignal:    HandleEncryptedRtcSignal(msg); return;
+                    case SignalType.ClientEncryptedChat: HandleEncryptedChatMessage(msg); return;
+                    case SignalType.ClientEditMessage:   HandleEditMessage(msg); return;
+                    case SignalType.ClientDeleteMessage: HandleDeleteMessage(msg); return;
+                }
+            }
+
+            Console.WriteLine($"Unrecognised WS message session={ID}: {msg[..Math.Min(120, msg.Length)]}");
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"WS message error session={ID}: {ex.Message}");
+        }
+    }
+
+    /// <summary>Switches on WsAction to the matching Handle* method. Pure routing — no I/O.</summary>
+    private void DispatchControl(WsAction action, WsControlMessage c)
+    {
+        switch (action)
+        {
+            case WsAction.Authenticate:    HandleAuthenticate(c);    break;
+            case WsAction.RegisterKey:     HandleRegisterKey(c);     break;
+            case WsAction.GetServerKey:    HandleGetServerKey();     break;
+            case WsAction.GetChannels:     HandleGetChannels();      break;
+            case WsAction.GetHistory:      HandleGetHistory(c);      break;
+            case WsAction.RtcJoin:         HandleRtcJoinChannel(c);  break;
+            case WsAction.RtcLeave:        HandleRtcLeaveChannel(c); break;
+            case WsAction.SendTyping:      HandleTyping(c);          break;
+            case WsAction.GetEditHistory:  HandleGetEditHistory(c);  break;
+            case WsAction.CreateChannel:   HandleCreateChannel(c);   break;
+            case WsAction.DeleteChannel:   HandleDeleteChannel(c);   break;
+            default: Console.WriteLine($"Unknown WsAction {action} session={ID}"); break;
+        }
+    }
+
+    /// <summary>
+    /// Verifies a Core-issued user token against the Core service. The HTTP call is wrapped in
+    /// try/catch so that a Core outage doesn't drop the chat session — we still ack with
+    /// WsEvent.Authenticated so the rest of the boot handshake can proceed.
+    ///
+    /// NOTE async void here is unavoidable (it's an event handler) but every exception path
+    /// must be caught locally or WebSocketSharp will tear down the session.
+    /// </summary>
+    private async void HandleAuthenticate(WsControlMessage c)
+    {
+        if (string.IsNullOrWhiteSpace(c.Username) || string.IsNullOrWhiteSpace(c.Token))
+        {
+            Console.WriteLine("Invalid Authenticate payload.");
+            return;
+        }
+
+        try
+        {
+            using var core = new HttpClient { BaseAddress = new Uri("http://127.0.0.1:1337") };
+            core.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+            core.DefaultRequestHeaders.Add("User-Agent", "RelayServer");
+
+            var resp = await core.PostAsJsonAsync("/server/verify/user",
+                new AuthUserVerify { Username = c.Username, Token = c.Token });
+
+            Console.WriteLine($"Auth [{c.Username}]: {await resp.Content.ReadAsStringAsync()}");
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"Auth failed for {c.Username}: {ex.Message}");
+        }
+
+        Send(JsonSerializer.Serialize(new WsEventMessage { Event = WsEvent.Authenticated, Detail = c.Username }));
+    }
+
+    /// <summary>
+    /// Stores or updates the client's RSA public key in client_public_keys, then registers the
+    /// (sessionId, username) mapping in ConnectedClientService. After this fires the server can
+    /// route encrypted chat messages to this user's connected devices.
+    /// </summary>
+    private void HandleRegisterKey(WsControlMessage c)
+    {
+        if (string.IsNullOrWhiteSpace(c.Username) || string.IsNullOrWhiteSpace(c.PublicKey))
+        {
+            Console.WriteLine("Invalid RegisterKey payload.");
+            return;
+        }
+
+        if (ClientKeyService is null) { Console.WriteLine("ClientKeyService null."); return; }
+
+        RegisterOrUpdateClientKeySync(c.Username, c.PublicKey);
+        ConnectedClientService.Register(ID, c.Username);
+
+        Console.WriteLine($"Key registered: {c.Username} (session={ID})");
+        Send(JsonSerializer.Serialize(new WsEventMessage { Event = WsEvent.KeyRegistered, Detail = c.Username }));
+    }
+
+    /// <summary>Sends the server's public RSA key. Called once per session right after RegisterKey.</summary>
+    private void HandleGetServerKey()
+    {
+        if (string.IsNullOrWhiteSpace(ServerPublicKey)) { Console.WriteLine("Server public key not initialised."); return; }
+        Send(JsonSerializer.Serialize(new ServerPublicKeyMessage { Type = SignalType.ServerPublicKey, PublicKey = ServerPublicKey }));
+    }
+
+    /// <summary>
+    /// Sends a channel list with CanPost/CanManage/visibility resolved for this specific user.
+    /// The username is looked up by session ID so the client never has to spoof it.
+    /// </summary>
+    private void HandleGetChannels()
+    {
+        if (Db is null) { Console.WriteLine("Db null."); return; }
+
+        // Resolve the requesting user so we can compute per-user CanPost for each channel.
+        var username = ConnectedClientService.GetUsernameForSession(ID) ?? string.Empty;
+
+        var channels = BuildChannelListForUser(username);
+        Send(JsonSerializer.Serialize(new SocketChannelList { Type = SignalType.ChannelList, Channels = channels }));
+    }
+
+    /// <summary>
+    /// Streams the channel's full message history back to the requester. Each message is:
+    ///   1. Decrypted from the channel DB key (ChannelCryptoService.Decrypt).
+    ///   2. Re-encrypted with the requester's public key (E2EeHelper.EncryptForRecipient).
+    ///   3. Sent as an individual SocketEncryptedMessage frame.
+    /// Deleted messages are sent as tombstones (IsDeleted=true, no ciphertext) so the client
+    /// can render a placeholder without trying to decrypt.
+    /// </summary>
+    private void HandleGetHistory(WsControlMessage c)
+    {
+        if (string.IsNullOrWhiteSpace(c.Username) || string.IsNullOrWhiteSpace(c.ChannelId))
+        {
+            Console.WriteLine("Invalid GetHistory payload.");
+            return;
+        }
+
+        if (!EnsureCoreReady() || ChannelCryptoService is null || string.IsNullOrWhiteSpace(ChannelDbKey)) return;
+
+        var targetClient = GetClientPublicKeyByUsernameSync(c.Username);
+        if (targetClient is null) { Console.WriteLine($"No public key for history user {c.Username}"); return; }
+
+        var messages = GetChannelMessagesSync()
+            .Where(m => m.ChannelId == c.ChannelId)
+            .OrderBy(m => m.CreatedAt)
+            .ToList();
+
+        Console.WriteLine($"Sending {messages.Count} history messages to {c.Username}");
+
+        foreach (var dbMsg in messages)
+        {
+            var msgId = GetRecordId(dbMsg.Id);
+
+            if (dbMsg.IsDeleted)
+            {
+                Send(JsonSerializer.Serialize(new SocketEncryptedMessage
+                {
+                    Type = SignalType.EncryptedChat, MessageId = msgId,
+                    SenderUsername = ExtractUsernameFromUserId(dbMsg.SenderUserId),
+                    RecipientUsername = c.Username, ChannelId = c.ChannelId, IsDeleted = true
+                }));
+                continue;
+            }
+
+            string plainText;
+            try { plainText = ChannelCryptoService.Decrypt(dbMsg.CipherText, dbMsg.Nonce, dbMsg.Tag, ChannelDbKey); }
+            catch (Exception ex) { Console.WriteLine($"History decrypt failed {dbMsg.Id}: {ex.Message}"); continue; }
+
+            var encrypted = E2EeHelper.EncryptForRecipient(plainText, targetClient.PublicKey);
+            Send(JsonSerializer.Serialize(new SocketEncryptedMessage
+            {
+                Type = SignalType.EncryptedChat, MessageId = msgId,
+                SenderUsername    = ExtractUsernameFromUserId(dbMsg.SenderUserId),
+                RecipientUsername = c.Username, ChannelId = c.ChannelId,
+                CipherText = encrypted.CipherText, Nonce = encrypted.Nonce,
+                Tag = encrypted.Tag, EncryptedKey = encrypted.EncryptedKey,
+                IsEdited = dbMsg.EditedAt.HasValue
+            }));
+        }
+    }
+
+    /// <summary>
+    /// Marks the session as present in a voice channel. Gated by CanSpeakAsync — if the user's
+    /// role is denied Speak here we reject with WsEvent.Error and refuse to register presence.
+    /// </summary>
+    private void HandleRtcJoinChannel(WsControlMessage c)
+    {
+        if (string.IsNullOrWhiteSpace(c.Username) || string.IsNullOrWhiteSpace(c.ChannelId))
+        {
+            Console.WriteLine("Invalid RtcJoin payload.");
+            return;
+        }
+
+        if (PermissionService is not null &&
+            !PermissionService.CanSpeakAsync(c.Username, c.ChannelId).GetAwaiter().GetResult())
+        {
+            Console.WriteLine($"RTC join denied (no Speak): user={c.Username}, channel={c.ChannelId}");
+            Send(JsonSerializer.Serialize(new WsEventMessage { Event = WsEvent.Error, Detail = "You don't have permission to speak in this channel." }));
+            return;
+        }
+
+        RtcChannelPresenceService.SetUser(ID, c.Username);
+        RtcChannelPresenceService.JoinChannel(ID, c.ChannelId);
+        Console.WriteLine($"RTC join: session={ID}, user={c.Username}, channel={c.ChannelId}");
+    }
+
+    /// <summary>Clears the session's voice-channel presence. Idempotent — safe to call when not in a channel.</summary>
+    private void HandleRtcLeaveChannel(WsControlMessage c)
+    {
+        if (!string.IsNullOrWhiteSpace(c.ChannelId) && RtcChannelPresenceService.IsInChannel(ID, c.ChannelId))
+            RtcChannelPresenceService.LeaveChannel(ID);
+        Console.WriteLine($"RTC leave: session={ID}, user={c.Username}");
+    }
+
+    /// <summary>
+    /// Broadcasts "{Username} is typing…" to every connected server member EXCEPT the sender.
+    /// Sender's username comes from ConnectedClientService (not the message payload) so a
+    /// malicious client can't impersonate someone else's typing.
+    /// </summary>
+    private void HandleTyping(WsControlMessage c)
+    {
+        var senderUsername = ConnectedClientService.GetUsernameForSession(ID);
+        if (string.IsNullOrWhiteSpace(senderUsername) || string.IsNullOrWhiteSpace(c.ChannelId)) return;
+
+        var json = JsonSerializer.Serialize(new SocketTypingEvent
+        {
+            Type     = SignalType.TypingIndicator,
+            Username = senderUsername,
+            ChannelId = c.ChannelId
+        });
+
+        foreach (var member in GetServerMembersSync())
+        {
+            var rawUsername = ExtractUsernameFromUserId(member.UserId);
+            if (string.Equals(rawUsername, senderUsername, StringComparison.OrdinalIgnoreCase)) continue;
+
+            foreach (var sid in ConnectedClientService.GetSessionsForUser(rawUsername))
+                Sessions.SendTo(json, sid);
+        }
+    }
+
+    /// <summary>
+    /// Streams every prior version of a message back to the requester. Each entry is decrypted
+    /// from the channel key then re-encrypted for the requester's public key. Drives the
+    /// "(edited)" tap-popup on the client.
+    /// </summary>
+    private void HandleGetEditHistory(WsControlMessage c)
+    {
+        if (string.IsNullOrWhiteSpace(c.MessageId) || string.IsNullOrWhiteSpace(c.Username)) return;
+        if (!EnsureCoreReady() || ChannelCryptoService is null || string.IsNullOrWhiteSpace(ChannelDbKey)) return;
+
+        var targetClient = GetClientPublicKeyByUsernameSync(c.Username);
+        if (targetClient is null) return;
+
+        var edits = GetChannelMessageEditsSync(c.MessageId)
+            .OrderBy(e => e.EditedAt)
+            .ToList();
+
+        var entries = new List<SocketEditHistoryEntry>();
+
+        foreach (var edit in edits)
+        {
+            string plainText;
+            try { plainText = ChannelCryptoService.Decrypt(edit.CipherText, edit.Nonce, edit.Tag, ChannelDbKey); }
+            catch (Exception ex) { Console.WriteLine($"Edit history decrypt failed: {ex.Message}"); continue; }
+
+            var encrypted = E2EeHelper.EncryptForRecipient(plainText, targetClient.PublicKey);
+            entries.Add(new SocketEditHistoryEntry
+            {
+                CipherText   = encrypted.CipherText,
+                Nonce        = encrypted.Nonce,
+                Tag          = encrypted.Tag,
+                EncryptedKey = encrypted.EncryptedKey,
+                EditedAt     = edit.EditedAt
+            });
+        }
+
+        Send(JsonSerializer.Serialize(new SocketEditHistoryResponse
+        {
+            Type      = SignalType.EditHistory,
+            MessageId = c.MessageId,
+            Entries   = entries
+        }));
+    }
+
+    /// <summary>
+    /// Permission-gated channel creation. On success, broadcasts the new channel list to every
+    /// connected member (computed per-user since CanPost/CanManage depend on the recipient).
+    /// </summary>
+    private void HandleCreateChannel(WsControlMessage c)
+    {
+        var username = ConnectedClientService.GetUsernameForSession(ID);
+        if (string.IsNullOrWhiteSpace(username)) return;
+
+        if (PermissionService is null || !PermissionService.CanManageChannelsAsync(username).GetAwaiter().GetResult())
+        {
+            Console.WriteLine($"CreateChannel denied for {username}: insufficient permissions.");
+            Send(JsonSerializer.Serialize(new WsEventMessage { Event = WsEvent.Error, Detail = "Permission denied." }));
+            return;
+        }
+
+        if (string.IsNullOrWhiteSpace(c.ChannelName))
+        {
+            Send(JsonSerializer.Serialize(new WsEventMessage { Event = WsEvent.Error, Detail = "Channel name is required." }));
+            return;
+        }
+
+        var type = (ChannelType)c.ChannelType;
+
+        Task.Run(async () => await Db!.Create("channels", new Channels
+        {
+            Name      = c.ChannelName,
+            Type      = type,
+            Group     = c.ChannelGroup ?? string.Empty,
+            CreatedAt = DateTime.UtcNow
+        })).GetAwaiter().GetResult();
+
+        Console.WriteLine($"Channel created: {c.ChannelName} ({type}) by {username}");
+        BroadcastChannelList();
+    }
+
+    /// <summary>
+    /// Permission-gated soft-delete (sets IsDeleted on the row, doesn't actually remove it).
+    /// Broadcasts a fresh channel list after — clients drop the channel from their sidebar.
+    /// </summary>
+    private void HandleDeleteChannel(WsControlMessage c)
+    {
+        var username = ConnectedClientService.GetUsernameForSession(ID);
+        if (string.IsNullOrWhiteSpace(username)) return;
+
+        if (PermissionService is null || !PermissionService.CanDeleteChannelAsync(username).GetAwaiter().GetResult())
+        {
+            Send(JsonSerializer.Serialize(new WsEventMessage { Event = WsEvent.Error, Detail = "Permission denied." }));
+            return;
+        }
+
+        if (string.IsNullOrWhiteSpace(c.ChannelId)) return;
+
+        var all = GetChannelsSync();
+        var target = all.FirstOrDefault(ch => GetRecordId(ch.Id) == c.ChannelId);
+        if (target is null) return;
+
+        target.IsDeleted = true;
+        Task.Run(async () => await Db!.Merge<Channels, Channels>(target))
+            .GetAwaiter().GetResult();
+
+        Console.WriteLine($"Channel deleted: {target.Name} by {username}");
+        BroadcastChannelList();
+    }
+
+    /// <summary>
+    /// Relays an encrypted WebRTC SDP/ICE signal to every other session in the same voice
+    /// channel. Decrypts with the server's private key, re-encrypts per-recipient. The server
+    /// never stores RTC signals — pure forwarding.
+    /// </summary>
+    private void HandleEncryptedRtcSignal(string msg)
+    {
+        SocketRtcSignalMessage? payload;
+        try { payload = JsonSerializer.Deserialize<SocketRtcSignalMessage>(msg); }
+        catch { Console.WriteLine("Failed to parse RTC signal."); return; }
+
+        if (payload is null || string.IsNullOrWhiteSpace(payload.ChannelId)) return;
+
+        string plainText;
+        try
+        {
+            plainText = E2EeHelper.DecryptForRecipient(
+                new EncryptedPayload { CipherText = payload.CipherText, Nonce = payload.Nonce, Tag = payload.Tag, EncryptedKey = payload.EncryptedKey },
+                ServerPrivateKey);
+        }
+        catch (Exception ex) { Console.WriteLine($"RTC decrypt failed: {ex.Message}"); return; }
+
+        foreach (var sid in RtcChannelPresenceService.GetSessionsInChannel(payload.ChannelId))
+        {
+            if (sid == ID) continue;
+            var uname = RtcChannelPresenceService.GetUsernameForSession(sid);
+            if (string.IsNullOrWhiteSpace(uname)) continue;
+            var key = GetClientPublicKeyByUsernameSync(uname);
+            if (key is null) continue;
+            var enc = E2EeHelper.EncryptForRecipient(plainText, key.PublicKey);
+            Sessions.SendTo(JsonSerializer.Serialize(new SocketRtcSignalMessage
+            {
+                Type = SignalType.EncryptedSignal, SenderUsername = payload.SenderUsername,
+                ChannelId = payload.ChannelId, CipherText = enc.CipherText,
+                Nonce = enc.Nonce, Tag = enc.Tag, EncryptedKey = enc.EncryptedKey
+            }), sid);
+        }
+    }
+
+    /// <summary>
+    /// The main chat-message path. Permission gate → server-side decrypt → store with channel
+    /// key → DeliverToServerMembers (per-user re-encrypt + send) → MirrorAttachmentIfNeeded.
+    /// </summary>
+    private void HandleEncryptedChatMessage(string msg)
+    {
+        SocketEncryptedMessage? payload;
+        try { payload = JsonSerializer.Deserialize<SocketEncryptedMessage>(msg); }
+        catch { Console.WriteLine("Failed to parse chat payload."); return; }
+
+        if (payload is null || payload.Type != SignalType.ClientEncryptedChat) return;
+        if (!EnsureCoreReady() || !EnsureCryptoReady()) return;
+
+        // Permission check.
+        var senderUsername = ConnectedClientService.GetUsernameForSession(ID);
+        if (string.IsNullOrWhiteSpace(senderUsername)) return;
+
+        if (PermissionService is not null &&
+            !PermissionService.CanSendMessagesAsync(senderUsername, payload.ChannelId).GetAwaiter().GetResult())
+        {
+            Send(JsonSerializer.Serialize(new WsEventMessage { Event = WsEvent.Error, Detail = "You cannot send messages in this channel." }));
+            return;
+        }
+
+        string plainText;
+        try
+        {
+            plainText = E2EeHelper.DecryptForRecipient(
+                new EncryptedPayload { CipherText = payload.CipherText, Nonce = payload.Nonce, Tag = payload.Tag, EncryptedKey = payload.EncryptedKey },
+                ServerPrivateKey);
+        }
+        catch (Exception ex) { Console.WriteLine($"Chat decrypt failed: {ex.Message}"); return; }
+
+        Console.WriteLine($"Decrypted chat from {payload.SenderUsername}");
+
+        string messageId;
+        try
+        {
+            var dbEnc = ChannelCryptoService!.Encrypt(plainText, ChannelDbKey);
+            var saved = CreateChannelMessageSync(new ChannelMessages
+            {
+                ChannelId    = payload.ChannelId,
+                SenderUserId = $"users:{payload.SenderUsername.ToLower()}",
+                CipherText   = dbEnc.cipherText,
+                Nonce        = dbEnc.nonce,
+                Tag          = dbEnc.tag,
+                CreatedAt    = DateTime.UtcNow
+            });
+            messageId = GetRecordId(saved.Id);
+            Console.WriteLine($"Message saved: {messageId}");
+        }
+        catch (Exception ex) { Console.WriteLine($"Save failed: {ex.Message}"); return; }
+
+        DeliverToServerMembers(plainText, payload.SenderUsername, payload.ChannelId,
+            messageId, SignalType.EncryptedChat, isEdited: false);
+
+        MirrorAttachmentIfNeeded(plainText, payload.SenderUsername, payload.ChannelId);
+    }
+
+    /// <summary>
+    /// If the origin channel has LinkedFileChannelId set and the message has a non-gif
+    /// attachment, stores+delivers a trimmed copy ("📎 Shared from #X by Y" + attachment)
+    /// into the linked File channel. No-op for plain text messages.
+    /// </summary>
+    private void MirrorAttachmentIfNeeded(string plainText, string senderUsername, string originChannelId)
+    {
+        ChatMessageContent? content;
+        try { content = JsonSerializer.Deserialize<ChatMessageContent>(plainText); }
+        catch { return; }
+
+        if (content is null || string.IsNullOrWhiteSpace(content.AttachmentBase64))
+            return;
+
+        // The user wants images, zips, docs — but not gifs (and links/text aren't attachments anyway).
+        var mime = content.AttachmentMimeType ?? string.Empty;
+        if (mime.Equals("image/gif", StringComparison.OrdinalIgnoreCase))
+            return;
+
+        var origin = GetChannelsSync().FirstOrDefault(ch => GetRecordId(ch.Id) == originChannelId);
+        if (origin?.LinkedFileChannelId is null) return;
+
+        var fileChannelId = origin.LinkedFileChannelId;
+
+        if (originChannelId == fileChannelId) return;
+
+        var mirror = new ChatMessageContent
+        {
+            Text               = $"📎 Shared from #{origin.Name} by {senderUsername}",
+            AttachmentBase64   = content.AttachmentBase64,
+            AttachmentMimeType = content.AttachmentMimeType,
+            AttachmentFileName = content.AttachmentFileName
+        };
+
+        var mirrorPlain = JsonSerializer.Serialize(mirror);
+
+        string mirrorId;
+        try
+        {
+            var dbEnc = ChannelCryptoService!.Encrypt(mirrorPlain, ChannelDbKey);
+            var saved = CreateChannelMessageSync(new ChannelMessages
+            {
+                ChannelId    = fileChannelId,
+                SenderUserId = $"users:{senderUsername.ToLower()}",
+                CipherText   = dbEnc.cipherText,
+                Nonce        = dbEnc.nonce,
+                Tag          = dbEnc.tag,
+                CreatedAt    = DateTime.UtcNow
+            });
+            mirrorId = GetRecordId(saved.Id);
+        }
+        catch (Exception ex) { Console.WriteLine($"File mirror save failed: {ex.Message}"); return; }
+
+        DeliverToServerMembers(mirrorPlain, senderUsername, fileChannelId,
+            mirrorId, SignalType.EncryptedChat, isEdited: false);
+
+        Console.WriteLine($"Mirrored attachment from {originChannelId} to file channel {fileChannelId}");
+    }
+
+    /// <summary>
+    /// Ownership-gated edit. Saves the OLD ciphertext as a ChannelMessageEdits row before
+    /// overwriting the current row, so the edit chain is preserved. Broadcasts MessageEdited
+    /// with the new ciphertext so every recipient updates their bubble in place.
+    /// </summary>
+    private void HandleEditMessage(string msg)
+    {
+        SocketEncryptedMessage? request;
+        try { request = JsonSerializer.Deserialize<SocketEncryptedMessage>(msg); }
+        catch { Console.WriteLine("Failed to parse edit request."); return; }
+
+        if (request is null || string.IsNullOrWhiteSpace(request.MessageId)) return;
+        if (!EnsureCoreReady() || !EnsureCryptoReady()) return;
+
+        var senderUsername = ConnectedClientService.GetUsernameForSession(ID);
+        if (string.IsNullOrWhiteSpace(senderUsername)) return;
+
+        var existing = GetChannelMessageByIdSync(request.MessageId);
+        if (existing is null) { Console.WriteLine($"Edit: message {request.MessageId} not found."); return; }
+
+        if (!string.Equals(ExtractUsernameFromUserId(existing.SenderUserId), senderUsername, StringComparison.OrdinalIgnoreCase))
+        {
+            Console.WriteLine($"Edit denied: {senderUsername} does not own {request.MessageId}.");
+            return;
+        }
+
+        string newPlainText;
+        try
+        {
+            newPlainText = E2EeHelper.DecryptForRecipient(
+                new EncryptedPayload { CipherText = request.CipherText, Nonce = request.Nonce, Tag = request.Tag, EncryptedKey = request.EncryptedKey },
+                ServerPrivateKey);
+        }
+        catch (Exception ex) { Console.WriteLine($"Edit decrypt failed: {ex.Message}"); return; }
+
+        try
+        {
+            CreateChannelMessageEditSync(new ChannelMessageEdits
+            {
+                MessageId  = request.MessageId,
+                CipherText = existing.CipherText,
+                Nonce      = existing.Nonce,
+                Tag        = existing.Tag,
+                EditedAt   = existing.EditedAt ?? existing.CreatedAt
+            });
+        }
+        catch (Exception ex) { Console.WriteLine($"Edit history save failed: {ex.Message}"); }
+
+        try
+        {
+            var dbEnc = ChannelCryptoService!.Encrypt(newPlainText, ChannelDbKey);
+            existing.CipherText = dbEnc.cipherText;
+            existing.Nonce      = dbEnc.nonce;
+            existing.Tag        = dbEnc.tag;
+            existing.EditedAt   = DateTime.UtcNow;
+            UpdateChannelMessageSync(existing);
+            Console.WriteLine($"Message {request.MessageId} edited by {senderUsername}.");
+        }
+        catch (Exception ex) { Console.WriteLine($"Edit DB update failed: {ex.Message}"); return; }
+
+        DeliverToServerMembers(newPlainText, senderUsername, request.ChannelId,
+            request.MessageId, SignalType.MessageEdited, isEdited: true);
+    }
+
+    /// <summary>
+    /// Soft-delete (sets IsDeleted on the row). Allowed for the message author OR anyone with
+    /// ManageMessages permission in the channel. Broadcasts a tombstone event to every
+    /// connected member; their client swaps the bubble to a "deleted" placeholder.
+    /// </summary>
+    private void HandleDeleteMessage(string msg)
+    {
+        SocketEncryptedMessage? request;
+        try { request = JsonSerializer.Deserialize<SocketEncryptedMessage>(msg); }
+        catch { Console.WriteLine("Failed to parse delete request."); return; }
+
+        if (request is null || string.IsNullOrWhiteSpace(request.MessageId)) return;
+        if (!EnsureCoreReady()) return;
+
+        var senderUsername = ConnectedClientService.GetUsernameForSession(ID);
+        if (string.IsNullOrWhiteSpace(senderUsername)) return;
+
+        var existing = GetChannelMessageByIdSync(request.MessageId);
+        if (existing is null) return;
+
+        bool isOwner = string.Equals(ExtractUsernameFromUserId(existing.SenderUserId), senderUsername, StringComparison.OrdinalIgnoreCase);
+        bool canManage = PermissionService?.CanManageMessagesAsync(senderUsername, request.ChannelId).GetAwaiter().GetResult() ?? false;
+
+        if (!isOwner && !canManage)
+        {
+            Console.WriteLine($"Delete denied: {senderUsername} does not own {request.MessageId}.");
+            return;
+        }
+
+        try
+        {
+            existing.IsDeleted = true;
+            UpdateChannelMessageSync(existing);
+            Console.WriteLine($"Message {request.MessageId} deleted by {senderUsername}.");
+        }
+        catch (Exception ex) { Console.WriteLine($"Delete DB update failed: {ex.Message}"); return; }
+
+        var deletedEvent = JsonSerializer.Serialize(new SocketMessageDeletedEvent
+        {
+            Type = SignalType.MessageDeleted, MessageId = request.MessageId, ChannelId = request.ChannelId
+        });
+
+        foreach (var member in GetServerMembersSync())
+        {
+            var rawUsername = ExtractUsernameFromUserId(member.UserId);
+            foreach (var sid in ConnectedClientService.GetSessionsForUser(rawUsername))
+                Sessions.SendTo(deletedEvent, sid);
+        }
+    }
+
+    /// <summary>
+    /// The fan-out for any chat-message delivery (new send, edit broadcast). For each
+    /// server_members row, looks up active sessions, fetches that user's public key, encrypts
+    /// the plaintext for them, and sends to every one of their sessions (multi-device).
+    ///
+    /// "ProperUsername" is the mixed-case version captured at RegisterKey time, used so the
+    /// client's case-insensitive compare picks up the message instead of dropping it silently.
+    /// </summary>
+    private void DeliverToServerMembers(
+        string plainText, string senderUsername, string channelId,
+        string messageId, SignalType signalType, bool isEdited)
+    {
+        foreach (var member in GetServerMembersSync())
+        {
+            var rawUsername = ExtractUsernameFromUserId(member.UserId);
+            var sessionIds  = ConnectedClientService.GetSessionsForUser(rawUsername);
+            if (sessionIds.Count == 0) continue;
+
+            var properUsername = sessionIds
+                .Select(ConnectedClientService.GetUsernameForSession)
+                .FirstOrDefault(u => u is not null) ?? rawUsername;
+
+            var clientKey = GetClientPublicKeyByUsernameSync(properUsername);
+            if (clientKey is null) { Console.WriteLine($"No public key for {properUsername}, skipping."); continue; }
+
+            var encrypted = E2EeHelper.EncryptForRecipient(plainText, clientKey.PublicKey);
+            var json = JsonSerializer.Serialize(new SocketEncryptedMessage
+            {
+                Type = signalType, MessageId = messageId,
+                SenderUsername = senderUsername, RecipientUsername = properUsername, ChannelId = channelId,
+                CipherText = encrypted.CipherText, Nonce = encrypted.Nonce,
+                Tag = encrypted.Tag, EncryptedKey = encrypted.EncryptedKey,
+                IsEdited = isEdited
+            });
+
+            foreach (var sid in sessionIds)
+                Sessions.SendTo(json, sid);
+        }
+    }
+
+    /// <summary>
+    /// Pushes a freshly-built channel list to every connected member. Has to compute the list
+    /// PER user because CanPost/CanManage/visibility are user-specific. Called after Create/Delete.
+    /// </summary>
+    private void BroadcastChannelList()
+    {
+        foreach (var member in GetServerMembersSync())
+        {
+            var rawUsername = ExtractUsernameFromUserId(member.UserId);
+            var sessionIds  = ConnectedClientService.GetSessionsForUser(rawUsername);
+            if (sessionIds.Count == 0) continue;
+
+            var properUsername = sessionIds
+                .Select(ConnectedClientService.GetUsernameForSession)
+                .FirstOrDefault(u => u is not null) ?? rawUsername;
+
+            var channels = BuildChannelListForUser(properUsername);
+            var json = JsonSerializer.Serialize(new SocketChannelList { Type = SignalType.ChannelList, Channels = channels });
+
+            foreach (var sid in sessionIds)
+                Sessions.SendTo(json, sid);
+        }
+    }
+
+    /// <summary>
+    /// Resolves the channel list a specific user can see, with CanPost/CanManage flags filled
+    /// in. Visibility (ViewChannel) determines inclusion — denied channels are filtered out.
+    /// </summary>
+    private List<ChannelItem> BuildChannelListForUser(string username)
+    {
+        var rawChannels = GetChannelsSync()
+            .Where(c => !c.IsDeleted)
+            .OrderBy(c => c.CreatedAt)
+            .ToList();
+
+        var items = new List<ChannelItem>();
+
+        foreach (var c in rawChannels)
+        {
+            var channelId = GetRecordId(c.Id);
+
+            // "Visibility" — drop channels this user is not allowed to see.
+            if (PermissionService is not null &&
+                !PermissionService.CanViewChannelAsync(username, channelId).GetAwaiter().GetResult())
+                continue;
+
+            bool canPost   = PermissionService is null
+                || PermissionService.CanSendMessagesAsync(username, channelId).GetAwaiter().GetResult();
+            bool canManage = PermissionService is not null &&
+                (PermissionService.CanDeleteChannelAsync(username).GetAwaiter().GetResult() ||
+                 PermissionService.CanEditChannelAsync(username).GetAwaiter().GetResult());
+
+            items.Add(new ChannelItem
+            {
+                ChannelId  = channelId,
+                Name       = c.Name,
+                Type       = c.Type,
+                Group      = c.Group,
+                IsReadOnly = c.IsReadOnly,
+                CanPost    = canPost,
+                CanManage  = canManage,
+                CreatedAt  = c.CreatedAt
+            });
+        }
+
+        return items;
+    }
+
+    /// <summary>
+    /// WebSocketSharp callback when the connection drops (clean close OR network drop). Clears
+    /// both presence registries so other clients aren't trying to send to a dead session.
+    /// </summary>
+    protected override void OnClose(CloseEventArgs e)
+    {
+        ConnectedClientService.Unregister(ID);
+        RtcChannelPresenceService.RemoveSession(ID);
+        Console.WriteLine($"WS closed: session={ID}, code={e.Code}");
+        base.OnClose(e);
+    }
+
+    /// <summary>WebSocketSharp callback for socket-level errors. Logged but non-fatal.</summary>
+    protected override void OnError(ErrorEventArgs e)
+    {
+        Console.WriteLine($"WS error: session={ID}, message={e.Message}");
+        base.OnError(e);
+    }
+
+    // -------------------------------------------------------------------------
+    // Sync DB shims. WebSocketSharp's handler methods are synchronous, so async DB calls
+    // are wrapped in Task.Run(...).GetAwaiter().GetResult(). Not ideal but pragmatic — the
+    // alternative is refactoring WebSocketSharp's behavior model.
+    // -------------------------------------------------------------------------
+
+    private void RegisterOrUpdateClientKeySync(string username, string publicKey) =>
+        Task.Run(async () => await ClientKeyService!.RegisterOrUpdateKeyAsync(username, publicKey)).GetAwaiter().GetResult();
+
+    private List<Channels> GetChannelsSync() =>
+        Task.Run(async () => await Db!.Select<Channels>("channels")).GetAwaiter().GetResult().ToList();
+
+    private ClientPublicKeys? GetClientPublicKeyByUsernameSync(string username) =>
+        Task.Run(async () => await ClientKeyService!.GetByUsernameAsync(username)).GetAwaiter().GetResult();
+
+    private List<ChannelMessages> GetChannelMessagesSync() =>
+        Task.Run(async () => await Db!.Select<ChannelMessages>("channel_messages")).GetAwaiter().GetResult().ToList();
+
+    private ChannelMessages? GetChannelMessageByIdSync(string messageId) =>
+        GetChannelMessagesSync().FirstOrDefault(m => GetRecordId(m.Id) == messageId);
+
+    private ChannelMessages CreateChannelMessageSync(ChannelMessages message) =>
+        Task.Run(async () => await Db!.Create("channel_messages", message)).GetAwaiter().GetResult();
+
+    private void UpdateChannelMessageSync(ChannelMessages message) =>
+        Task.Run(async () => await Db!.Merge<ChannelMessages, ChannelMessages>(message)).GetAwaiter().GetResult();
+
+    private void CreateChannelMessageEditSync(ChannelMessageEdits edit) =>
+        Task.Run(async () => await Db!.Create("channel_message_edits", edit)).GetAwaiter().GetResult();
+
+    private List<ChannelMessageEdits> GetChannelMessageEditsSync(string messageId)
+    {
+        var all = Task.Run(async () => await Db!.Select<ChannelMessageEdits>("channel_message_edits"))
+            .GetAwaiter().GetResult().ToList();
+        return all.Where(e => e.MessageId == messageId).ToList();
+    }
+
+    private List<ServerMembers> GetServerMembersSync() =>
+        Task.Run(async () => await Db!.Select<ServerMembers>("server_members")).GetAwaiter().GetResult().ToList();
+
+    /// <summary>"users:keeper317" → "keeper317". Stored as Surreal record id, displayed as plain name.</summary>
+    private static string ExtractUsernameFromUserId(string senderUserId)
+    {
+        if (string.IsNullOrWhiteSpace(senderUserId)) return "Unknown";
+        var parts = senderUserId.Split(':', 2);
+        return parts.Length == 2 ? parts[1] : senderUserId;
+    }
+
+    /// <summary>SurrealDB's Id object → "table:recordId" string. Used for storing parent refs as strings in child rows.</summary>
+    private static string GetRecordId(object? id)
+    {
+        if (id is null) return string.Empty;
+        var json = JsonSerializer.Serialize(id);
+        using var doc = JsonDocument.Parse(json);
+        var root = doc.RootElement;
+        return $"{root.GetProperty("Table").GetString()}:{root.GetProperty("Id").GetString()}";
+    }
+
+    /// <summary>Guard: returns true if the DB and key service are both initialised. Logs and returns false otherwise.</summary>
+    private bool EnsureCoreReady()
+    {
+        if (ClientKeyService is null || Db is null) { Console.WriteLine("Core services null."); return false; }
+        return true;
+    }
+
+    /// <summary>Guard: returns true if encryption keys + channel crypto service are all set. Logs and returns false otherwise.</summary>
+    private bool EnsureCryptoReady()
+    {
+        if (string.IsNullOrWhiteSpace(ServerPrivateKey) || string.IsNullOrWhiteSpace(ChannelDbKey) || ChannelCryptoService is null)
+        {
+            Console.WriteLine("Crypto keys null.");
+            return false;
+        }
+        return true;
+    }
+}

RelayServer/Services/Chat/ConnectedClientService.cs

@@ -0,0 +1,100 @@
+using System.Collections.Concurrent;
+
+namespace RelayServer.Services.Chat;
+
+/// <summary>
+/// Two-way in-memory mapping between WebSocket session IDs and usernames.
+///
+/// Why both directions: when a chat message arrives, we need to look up "which sessions does
+/// this server member have open right now?" (username → sessions) so we can deliver to each
+/// of their devices. When a connection closes, we need to know "which user owned this session?"
+/// (session → username) to clean up correctly.
+///
+/// Multi-device support: one username can have multiple sessions (phone + desktop + web all
+/// connected simultaneously). UsernameToSessions stores a HashSet per username; each lock
+/// is scoped to that specific HashSet so different users never block each other.
+///
+/// Username comparisons are case-insensitive (OrdinalIgnoreCase on the outer dictionary)
+/// because the DB stores usernames lowercase but clients may register with mixed case.
+/// </summary>
+public static class ConnectedClientService
+{
+    private static readonly ConcurrentDictionary<string, string> SessionToUsername = new();
+    private static readonly ConcurrentDictionary<string, HashSet<string>> UsernameToSessions =
+        new(StringComparer.OrdinalIgnoreCase);
+
+    /// <summary>
+    /// Associates a session ID with a username. Called from HandleRegisterKey. If the same
+    /// session re-registers under a different username (rare — basically only if the client
+    /// reauthenticates), the old mapping is cleaned up first to avoid double-bookkeeping.
+    /// </summary>
+    public static void Register(string sessionId, string username)
+    {
+        if (SessionToUsername.TryGetValue(sessionId, out var oldUsername) &&
+            !string.Equals(oldUsername, username, StringComparison.OrdinalIgnoreCase))
+        {
+            RemoveSessionFromUsername(sessionId, oldUsername);
+        }
+
+        SessionToUsername[sessionId] = username;
+
+        var sessions = UsernameToSessions.GetOrAdd(
+            username,
+            _ => new HashSet<string>(StringComparer.Ordinal));
+
+        lock (sessions)
+            sessions.Add(sessionId);
+    }
+
+    /// <summary>
+    /// Removes a session from both mappings. Called from OnClose. Idempotent — calling for
+    /// a session that's already gone is a no-op.
+    /// </summary>
+    public static void Unregister(string sessionId)
+    {
+        if (SessionToUsername.TryRemove(sessionId, out var username))
+            RemoveSessionFromUsername(sessionId, username);
+    }
+
+    /// <summary>
+    /// Returns every active session ID for a given username (case-insensitive lookup).
+    /// Empty collection if the user is offline. Snapshot-safe: the returned list is a copy,
+    /// not a live view of the underlying HashSet.
+    /// </summary>
+    public static IReadOnlyCollection<string> GetSessionsForUser(string username)
+    {
+        if (UsernameToSessions.TryGetValue(username, out var sessions))
+        {
+            lock (sessions)
+                return sessions.ToList();
+        }
+
+        return Array.Empty<string>();
+    }
+
+    /// <summary>
+    /// Reverse lookup: which user owns this session? Returns the mixed-case username the
+    /// client registered with (preserves casing for display). Null if the session is unknown.
+    /// </summary>
+    public static string? GetUsernameForSession(string sessionId)
+    {
+        return SessionToUsername.TryGetValue(sessionId, out var u) ? u : null;
+    }
+
+    /// <summary>
+    /// Internal cleanup: pulls a session out of the username→sessions HashSet, and removes
+    /// the username entry entirely if no sessions remain (keeps the dictionary lean).
+    /// </summary>
+    private static void RemoveSessionFromUsername(string sessionId, string username)
+    {
+        if (!UsernameToSessions.TryGetValue(username, out var sessions))
+            return;
+
+        lock (sessions)
+        {
+            sessions.Remove(sessionId);
+            if (sessions.Count == 0)
+                UsernameToSessions.TryRemove(username, out _);
+        }
+    }
+}

RelayServer/Services/Core/CoreClientService.cs

@@ -0,0 +1,17 @@
+namespace RelayServer.Services.Core;
+
+public sealed class CoreClientService
+{
+    public Task<CoreUser?> GetUserByUsernameAsync(string username)
+    {
+        return Task.FromResult<CoreUser?>(username switch
+        {
+            "Keeper317" => new CoreUser("users:keeper317", "Keeper317", true),
+            "Ru_Kira" => new CoreUser("users:ru_kira", "Ru_Kira", true),
+            "Test" => new CoreUser("users:test", "Test", true),
+            _ => null
+        });
+    }
+}
+
+public sealed record CoreUser(string Id, string Username, bool Licensed);

RelayServer/Services/Core/ServerBootstrapService.cs

@@ -0,0 +1,318 @@
+using System.Text.Json;
+using RelayServer.Models;
+using RelayServer.Services.Chat;
+using RelayServer.Services.Crypto;
+using RelayShared.Services;
+using SurrealDb.Net;
+
+namespace RelayServer.Services.Core;
+
+/// <summary>
+/// Idempotent server setup. Runs once at boot from Program.cs.
+///
+/// Each "Ensure*" helper either inserts a missing row or patches an existing one so the
+/// declared state matches the code. Running this twice in a row is a no-op.
+///
+/// What it provisions:
+///   - Verifies the three test users exist via CoreClientService (currently a hardcoded stub).
+///   - Creates the "Test Server" row in the servers table if missing.
+///   - Adds those users to server_members, with Keeper317 as IsOwner=true.
+///   - Creates the four premade channels with correct ChannelType and IsReadOnly flags:
+///         welcome (Text, read-only)   general (Text)
+///         files   (File, read-only)   voice-general (Voice)
+///   - Links #general → #files so attachments posted in #general auto-mirror to #files.
+///   - Creates the three roles: Admin (all perms), Moderator (manage messages), Member (read+send).
+///   - Assigns exactly one role per user (Keeper→Admin, Kira→Moderator, Test→Member).
+///     SetUserRoleAsync DELETES stale assignments to guarantee single-role-per-user.
+///   - Writes channel_permissions overrides explicitly denying Members SendMessages in
+///     #welcome and #files.
+///   - Generates the server's RSA keypair + the channel AES key on first boot, stores both
+///     in server_encryption_keys, and copies them into ChatSocketBehavior's static fields.
+/// </summary>
+public sealed class ServerBootstrapService
+{
+    private readonly SurrealDbClient _db;
+    private readonly CoreClientService _coreClient;
+    private readonly ChannelCryptoService _cryptoService;
+
+    public ServerBootstrapService(
+        SurrealDbClient db,
+        CoreClientService coreClient,
+        ChannelCryptoService cryptoService)
+    {
+        _db = db;
+        _coreClient = coreClient;
+        _cryptoService = cryptoService;
+    }
+
+    public async Task InitializeAsync()
+    {
+        var keeper = await _coreClient.GetUserByUsernameAsync("Keeper317");
+        var kira   = await _coreClient.GetUserByUsernameAsync("Ru_Kira");
+        var test   = await _coreClient.GetUserByUsernameAsync("Test");
+
+        if (keeper is null || kira is null || test is null)
+            throw new InvalidOperationException("One or more required users do not exist in RelayCore.");
+
+        if (!keeper.Licensed || !kira.Licensed || !test.Licensed)
+            throw new InvalidOperationException("One or more required users are not licensed.");
+
+        Console.WriteLine($"Core verified: {keeper.Username}, {kira.Username}, {test.Username}");
+
+        var server = await GetServerByNameAsync("Test Server");
+
+        if (server is null)
+        {
+            server = await _db.Create("servers", new Servers
+            {
+                Name = "Test Server",
+                OwnerUserId = keeper.Id,
+                CreatedAt = DateTime.UtcNow
+            });
+            Console.WriteLine($"Server created: {ToJson(server)}");
+        }
+        else
+        {
+            Console.WriteLine($"Server already exists: {server.Name}");
+        }
+
+        await EnsureServerMemberAsync(keeper.Id, isOwner: true);
+        await EnsureServerMemberAsync(kira.Id,   isOwner: false);
+        await EnsureServerMemberAsync(test.Id,   isOwner: false);
+        Console.WriteLine("Server members ensured.");
+
+        var tBase = new DateTime(2024, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+
+        var chWelcome = await EnsureChannelAsync("welcome",       ChannelType.Text,  group: "General", isReadOnly: true,  createdAt: tBase);
+        var chGeneral = await EnsureChannelAsync("general",       ChannelType.Text,  group: "General", isReadOnly: false, createdAt: tBase.AddHours(1));
+        var chFiles   = await EnsureChannelAsync("files",         ChannelType.File,  group: "General", isReadOnly: true,  createdAt: tBase.AddHours(2));
+        var chVoice   = await EnsureChannelAsync("voice-general", ChannelType.Voice, group: "General", isReadOnly: false, createdAt: tBase.AddHours(3));
+
+        Console.WriteLine($"Channels: {GetRecordId(chWelcome.Id)} | {GetRecordId(chGeneral.Id)} | {GetRecordId(chFiles.Id)} | {GetRecordId(chVoice.Id)}");
+
+        await EnsureFileChannelLinkAsync(chGeneral, GetRecordId(chFiles.Id));
+
+        var adminRole  = await EnsureRoleAsync("Admin",     PermissionFlags.Administrator, priority: 0);
+        var modRole    = await EnsureRoleAsync("Moderator", PermissionFlags.ReadMessages | PermissionFlags.SendMessages | PermissionFlags.ManageMessages, priority: 1);
+        var memberRole = await EnsureRoleAsync("Member",    PermissionFlags.ReadMessages | PermissionFlags.SendMessages, priority: 2);
+
+        Console.WriteLine($"Roles ensured: Admin={GetRecordId(adminRole.Id)}, Mod={GetRecordId(modRole.Id)}, Member={GetRecordId(memberRole.Id)}");
+
+        await SetUserRoleAsync(keeper.Id, GetRecordId(adminRole.Id));
+        await SetUserRoleAsync(kira.Id,   GetRecordId(modRole.Id));
+        await SetUserRoleAsync(test.Id,   GetRecordId(memberRole.Id));
+        Console.WriteLine("User roles set.");
+
+        await EnsureChannelPermissionAsync(GetRecordId(chWelcome.Id), GetRecordId(memberRole.Id),
+            allow: PermissionFlags.ReadMessages, deny: PermissionFlags.SendMessages);
+        await EnsureChannelPermissionAsync(GetRecordId(chFiles.Id), GetRecordId(memberRole.Id),
+            allow: PermissionFlags.ReadMessages, deny: PermissionFlags.SendMessages);
+
+        Console.WriteLine("Channel permissions ensured.");
+
+        var existingKey = await GetLatestServerEncryptionKeyAsync();
+
+        if (existingKey is null)
+        {
+            var keyBase64  = _cryptoService.GenerateKey();
+            var serverKeys = E2EeHelper.GenerateRsaKeyPair();
+
+            existingKey = await _db.Create("server_encryption_keys", new ServerEncryptionKeys
+            {
+                KeyBase64  = keyBase64,
+                PublicKey  = serverKeys.publicKey,
+                PrivateKey = serverKeys.privateKey,
+                CreatedAt  = DateTime.UtcNow,
+                UpdatedAt  = DateTime.UtcNow
+            });
+
+            Console.WriteLine("Server encryption key created.");
+        }
+        else
+        {
+            Console.WriteLine("Server encryption key already exists.");
+        }
+
+        ChatSocketBehavior.ServerPublicKey = existingKey.PublicKey;
+        ChatSocketBehavior.ServerPrivateKey = existingKey.PrivateKey;
+        ChatSocketBehavior.ChannelDbKey = existingKey.KeyBase64;
+    }
+
+    private async Task EnsureServerMemberAsync(string userId, bool isOwner)
+    {
+        var members  = await _db.Select<ServerMembers>("server_members");
+        var existing = members.FirstOrDefault(m => m.UserId == userId);
+
+        if (existing is not null)
+        {
+            if (existing.IsOwner != isOwner)
+            {
+                existing.IsOwner = isOwner;
+                await _db.Merge<ServerMembers, ServerMembers>(existing);
+                Console.WriteLine($"Member IsOwner updated: {userId} → {isOwner}");
+            }
+            else
+            {
+                Console.WriteLine($"Member already correct: {userId}");
+            }
+            return;
+        }
+
+        await _db.Create("server_members", new ServerMembers
+        {
+            UserId   = userId,
+            JoinedAt = DateTime.UtcNow,
+            IsOwner  = isOwner
+        });
+        Console.WriteLine($"Member created: {userId} (IsOwner={isOwner})");
+    }
+
+    private async Task<Channels> EnsureChannelAsync(
+        string name, ChannelType type, string group, bool isReadOnly, DateTime createdAt)
+    {
+        var channels = await _db.Select<Channels>("channels");
+        var existing = channels.FirstOrDefault(c => c.Name == name);
+
+        if (existing is not null)
+        {
+            bool dirty = existing.Type != type || existing.Group != group || existing.IsReadOnly != isReadOnly;
+            if (dirty)
+            {
+                existing.Type       = type;
+                existing.Group      = group;
+                existing.IsReadOnly = isReadOnly;
+                await _db.Merge<Channels, Channels>(existing);
+                Console.WriteLine($"Channel updated: {name}");
+            }
+            else
+            {
+                Console.WriteLine($"Channel already correct: {name}");
+            }
+            return existing;
+        }
+
+        var channel = await _db.Create("channels", new Channels
+        {
+            Name       = name,
+            Type       = type,
+            Group      = group,
+            IsReadOnly = isReadOnly,
+            CreatedAt  = createdAt
+        });
+
+        Console.WriteLine($"Channel created: {name} ({type})");
+        return channel;
+    }
+
+    private async Task EnsureFileChannelLinkAsync(Channels channel, string fileChannelId)
+    {
+        if (channel.LinkedFileChannelId == fileChannelId)
+        {
+            Console.WriteLine($"File link already correct: {channel.Name} → {fileChannelId}");
+            return;
+        }
+
+        channel.LinkedFileChannelId = fileChannelId;
+        await _db.Merge<Channels, Channels>(channel);
+        Console.WriteLine($"File link set: {channel.Name} → {fileChannelId}");
+    }
+
+    private async Task<Roles> EnsureRoleAsync(string name, PermissionFlags permissions, int priority)
+    {
+        var roles = await _db.Select<Roles>("roles");
+        var existing = roles.FirstOrDefault(r => r.Name == name);
+
+        if (existing is not null)
+        {
+            Console.WriteLine($"Role already exists: {name}");
+            return existing;
+        }
+
+        var role = await _db.Create("roles", new Roles
+        {
+            Name        = name,
+            Permissions = permissions,
+            Priority    = priority,
+            CreatedAt   = DateTime.UtcNow
+        });
+        Console.WriteLine($"Role created: {name}");
+        return role;
+    }
+
+    private async Task SetUserRoleAsync(string userId, string roleId)
+    {
+        var userRoles = await _db.Select<UserRoles>("user_roles");
+        var existing  = userRoles
+            .Where(ur => string.Equals(ur.UserId, userId, StringComparison.OrdinalIgnoreCase))
+            .ToList();
+
+        bool alreadyCorrect = existing.Count == 1 && existing[0].RoleId == roleId;
+        if (alreadyCorrect)
+        {
+            Console.WriteLine($"UserRole already correct: {userId} → {roleId}");
+            return;
+        }
+
+        foreach (var stale in existing)
+        {
+            if (stale.Id is not null)
+                await _db.Delete(stale.Id);
+        }
+
+        await _db.Create("user_roles", new UserRoles
+        {
+            UserId     = userId,
+            RoleId     = roleId,
+            AssignedAt = DateTime.UtcNow
+        });
+        Console.WriteLine($"UserRole set: {userId} → {roleId}");
+    }
+
+    private async Task EnsureChannelPermissionAsync(
+        string channelId, string roleId, PermissionFlags allow, PermissionFlags deny)
+    {
+        var perms = await _db.Select<ChannelPermissions>("channel_permissions");
+        if (perms.Any(cp => cp.ChannelId == channelId && cp.RoleId == roleId))
+        {
+            Console.WriteLine($"ChannelPermission already exists: {channelId} → {roleId}");
+            return;
+        }
+
+        await _db.Create("channel_permissions", new ChannelPermissions
+        {
+            ChannelId = channelId,
+            RoleId    = roleId,
+            Allow     = allow,
+            Deny      = deny
+        });
+        Console.WriteLine($"ChannelPermission created: {channelId} → {roleId} | allow={allow}, deny={deny}");
+    }
+
+    private async Task<Servers?> GetServerByNameAsync(string name)
+    {
+        var servers = await _db.Select<Servers>("servers");
+        return servers.FirstOrDefault(x => x.Name == name);
+    }
+
+    private async Task<ServerEncryptionKeys?> GetLatestServerEncryptionKeyAsync()
+    {
+        var keys = await _db.Select<ServerEncryptionKeys>("server_encryption_keys");
+        return keys.OrderByDescending(x => x.CreatedAt).FirstOrDefault();
+    }
+
+    private static string GetRecordId(object? id)
+    {
+        if (id is null) return string.Empty;
+        var json = JsonSerializer.Serialize(id);
+        using var doc = JsonDocument.Parse(json);
+        var root = doc.RootElement;
+        return $"{root.GetProperty("Table").GetString()}:{root.GetProperty("Id").GetString()}";
+    }
+
+    private static string ToJson(object? obj) =>
+        JsonSerializer.Serialize(obj, new JsonSerializerOptions
+        {
+            WriteIndented = true,
+            Encoder = System.Text.Encodings.Web.JavaScriptEncoder.UnsafeRelaxedJsonEscaping
+        });
+}

RelayServer/Services/Crypto/E2EeHelper.cs

@@ -0,0 +1,98 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace RelayServer.Services.Crypto;
+
+/// <summary>
+/// Hybrid RSA-2048 + AES-GCM-256 encryption. Used for any payload that needs to be
+/// readable by exactly one party (the holder of a specific RSA private key).
+///
+///   Encrypt:
+///     1. Generate a fresh 256-bit AES key and 96-bit nonce.
+///     2. Encrypt the plaintext with AES-GCM → CipherText + Tag (auth tag, 128-bit).
+///     3. Encrypt the AES key with the recipient's RSA public key (OAEP-SHA256).
+///     4. Return all four as base64 strings in an EncryptedPayload.
+///
+///   Decrypt: reverse — RSA-decrypt the AES key, then AES-GCM-decrypt the ciphertext.
+///
+/// Why hybrid: RSA can only encrypt small inputs (~190 bytes for 2048-bit OAEP-SHA256).
+/// Wrapping a symmetric key with RSA lets us encrypt arbitrarily large payloads while
+/// still using the recipient's RSA keypair as the access mechanism. This is the same
+/// design as PGP, TLS handshakes, etc.
+///
+/// The identical implementation exists in RelayClient.Crypto.E2EeHelper — they're
+/// mirrored on both ends so any payload encrypted on one side decrypts on the other.
+/// </summary>
+public static class E2EeHelper
+{
+    public static (string publicKey, string privateKey) GenerateRsaKeyPair()
+    {
+        using var rsa = RSA.Create(2048);
+
+        return (
+            Convert.ToBase64String(rsa.ExportSubjectPublicKeyInfo()),
+            Convert.ToBase64String(rsa.ExportPkcs8PrivateKey())
+        );
+    }
+
+    public static EncryptedPayload EncryptForRecipient(string plainText, string recipientPublicKeyBase64)
+    {
+        byte[] aesKey = RandomNumberGenerator.GetBytes(32);
+        byte[] nonce = RandomNumberGenerator.GetBytes(12);
+        byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);
+        byte[] cipherBytes = new byte[plainBytes.Length];
+        byte[] tag = new byte[16];
+
+        using (var aes = new AesGcm(aesKey, 16))
+        {
+            aes.Encrypt(nonce, plainBytes, cipherBytes, tag);
+        }
+
+        byte[] encryptedKey;
+        using (var rsa = RSA.Create())
+        {
+            rsa.ImportSubjectPublicKeyInfo(Convert.FromBase64String(recipientPublicKeyBase64), out _);
+            encryptedKey = rsa.Encrypt(aesKey, RSAEncryptionPadding.OaepSHA256);
+        }
+
+        return new EncryptedPayload
+        {
+            CipherText = Convert.ToBase64String(cipherBytes),
+            Nonce = Convert.ToBase64String(nonce),
+            Tag = Convert.ToBase64String(tag),
+            EncryptedKey = Convert.ToBase64String(encryptedKey)
+        };
+    }
+
+    public static string DecryptForRecipient(EncryptedPayload payload, string recipientPrivateKeyBase64)
+    {
+        byte[] aesKey;
+        using (var rsa = RSA.Create())
+        {
+            rsa.ImportPkcs8PrivateKey(Convert.FromBase64String(recipientPrivateKeyBase64), out _);
+            aesKey = rsa.Decrypt(Convert.FromBase64String(payload.EncryptedKey), RSAEncryptionPadding.OaepSHA256);
+        }
+
+        byte[] plainBytes = new byte[Convert.FromBase64String(payload.CipherText).Length];
+
+        using (var aes = new AesGcm(aesKey, 16))
+        {
+            aes.Decrypt(
+                Convert.FromBase64String(payload.Nonce),
+                Convert.FromBase64String(payload.CipherText),
+                Convert.FromBase64String(payload.Tag),
+                plainBytes
+            );
+        }
+
+        return Encoding.UTF8.GetString(plainBytes);
+    }
+}
+
+public class EncryptedPayload
+{
+    public required string CipherText { get; set; }
+    public required string Nonce { get; set; }
+    public required string Tag { get; set; }
+    public required string EncryptedKey { get; set; }
+}

RelayServer/Services/Data/ClientKeyService.cs

@@ -0,0 +1,61 @@
+using RelayServer.Models;
+using SurrealDb.Net;
+
+namespace RelayServer.Services.Data;
+
+public sealed class ClientKeyService
+{
+    private readonly SurrealDbClient _db;
+
+    public ClientKeyService(SurrealDbClient db)
+    {
+        _db = db;
+    }
+
+    public async Task RegisterOrUpdateKeyAsync(string username, string publicKey)
+    {
+        var allKeys = await _db.Select<ClientPublicKeys>("client_public_keys");
+
+        var existing = allKeys.FirstOrDefault(x => x.Username == username);
+
+        if (existing is null)
+        {
+            await _db.Create("client_public_keys", new ClientPublicKeys
+            {
+                Username = username,
+                PublicKey = publicKey,
+                CreatedAt = DateTime.UtcNow,
+                UpdatedAt = DateTime.UtcNow
+            });
+
+            Console.WriteLine($"Stored public key for {username}");
+            return;
+        }
+
+        existing.PublicKey = publicKey;
+        existing.UpdatedAt = DateTime.UtcNow;
+
+        await _db.Merge<ClientPublicKeys, ClientPublicKeys>(new ClientPublicKeys
+        {
+            Id = existing.Id,
+            Username = existing.Username,
+            PublicKey = existing.PublicKey,
+            CreatedAt = existing.CreatedAt,
+            UpdatedAt = existing.UpdatedAt
+        });
+
+        Console.WriteLine($"Updated public key for {username}");
+    }
+
+    public async Task<ClientPublicKeys?> GetByUsernameAsync(string username)
+    {
+        var allKeys = await _db.Select<ClientPublicKeys>("client_public_keys");
+        return allKeys.FirstOrDefault(x => x.Username == username);
+    }
+    
+    public async Task<List<ClientPublicKeys>> GetAllAsync()
+    {
+        var allKeys = await _db.Select<ClientPublicKeys>("client_public_keys");
+        return allKeys.ToList();
+    }
+}

RelayServer/Services/Data/PermissionService.cs

@@ -0,0 +1,209 @@
+using RelayServer.Models;
+using SurrealDb.Net;
+
+namespace RelayServer.Services.Data;
+
+public sealed class PermissionService
+{
+    private readonly SurrealDbClient _db;
+
+    public PermissionService(SurrealDbClient db)
+    {
+        _db = db;
+    }
+
+    /// <summary>
+    /// Owners/admins always allowed. Non-admins blocked from read-only channels (#welcome,
+    /// #files). Everyone else passes through the normal channel-level Deny → Allow → role ladder.
+    /// </summary>
+    public async Task<bool> CanSendMessagesAsync(string username, string channelId)
+    {
+        if (await IsOwnerOrAdminAsync(username))
+            return true;
+
+        if (await IsChannelReadOnlyAsync(channelId))
+            return false;
+
+        return await HasPermissionAsync(username, channelId, PermissionFlags.SendMessages);
+    }
+
+    /// <summary>Server-wide ability to create channels. Gates the "+" button on the sidebar.</summary>
+    public async Task<bool> CanManageChannelsAsync(string username) =>
+        await IsOwnerOrAdminAsync(username) ||
+        await HasGlobalPermissionAsync(username, PermissionFlags.ManageChannels);
+
+    /// <summary>Per-channel ability to delete/edit OTHER people's messages. Authors can always delete their own.</summary>
+    public async Task<bool> CanManageMessagesAsync(string username, string channelId) =>
+        await IsOwnerOrAdminAsync(username) ||
+        await HasPermissionAsync(username, channelId, PermissionFlags.ManageMessages);
+
+    /// <summary>Convenience query — exposes the owner-or-admin shortcut as a public method.</summary>
+    public async Task<bool> IsAdministratorAsync(string username) =>
+        await IsOwnerOrAdminAsync(username);
+
+    /// <summary>
+    /// "Visibility" — default-allow. Only blocks if a channel-level Deny mask explicitly
+    /// removes ViewChannel for the user's role. Owners/admins bypass.
+    /// </summary>
+    public async Task<bool> CanViewChannelAsync(string username, string channelId)
+    {
+        if (await IsOwnerOrAdminAsync(username)) return true;
+        return !await IsDeniedByChannelAsync(username, channelId, PermissionFlags.ViewChannel);
+    }
+
+    /// <summary>
+    /// Voice-channel Speak. Default-allow. Blocked by channel-level Deny. Used at RtcJoin
+    /// time so denied users can't even register voice presence.
+    /// </summary>
+    public async Task<bool> CanSpeakAsync(string username, string channelId)
+    {
+        if (await IsOwnerOrAdminAsync(username)) return true;
+        return !await IsDeniedByChannelAsync(username, channelId, PermissionFlags.Speak);
+    }
+
+    /// <summary>Server-wide ability to delete channels. ManageChannels OR explicit DeleteChannel.</summary>
+    public async Task<bool> CanDeleteChannelAsync(string username) =>
+        await IsOwnerOrAdminAsync(username) ||
+        await HasGlobalPermissionAsync(username, PermissionFlags.ManageChannels) ||
+        await HasGlobalPermissionAsync(username, PermissionFlags.DeleteChannel);
+
+    /// <summary>Server-wide ability to edit channels. ManageChannels OR explicit EditChannel.</summary>
+    public async Task<bool> CanEditChannelAsync(string username) =>
+        await IsOwnerOrAdminAsync(username) ||
+        await HasGlobalPermissionAsync(username, PermissionFlags.ManageChannels) ||
+        await HasGlobalPermissionAsync(username, PermissionFlags.EditChannel);
+
+    /// <summary>
+    /// Step 1 of the ladder: owner flag OR Administrator permission on any assigned role.
+    /// Owner check goes first because it doesn't require roles to be seeded — server owner
+    /// is authoritative regardless of role-table state.
+    /// </summary>
+    private async Task<bool> IsOwnerOrAdminAsync(string username)
+    {
+        if (await IsServerOwnerAsync(username))
+            return true;
+
+        var roles = await GetUserRolesAsync(username);
+        return roles.Any(r => r.Permissions.HasFlag(PermissionFlags.Administrator));
+    }
+
+    /// <summary>
+    /// The canonical permission ladder for per-channel checks:
+    ///   1. Owner/admin → true.
+    ///   2. Channel-level Deny mask for any of the user's roles → false (Deny wins).
+    ///   3. Channel-level Allow mask for any of the user's roles → true.
+    ///   4. Base role permissions → fallback.
+    /// </summary>
+    private async Task<bool> HasPermissionAsync(
+        string username, string channelId, PermissionFlags flag)
+    {
+        if (await IsOwnerOrAdminAsync(username))
+            return true;
+
+        var userRoles = await GetUserRolesAsync(username);
+        if (userRoles.Count == 0) return false;
+
+        var channelOverrides = await GetChannelPermissionsAsync(channelId);
+        var userRoleIds = new HashSet<string>(userRoles.Select(r => GetRecordIdString(r.Id)));
+
+        foreach (var co in channelOverrides.Where(co => userRoleIds.Contains(co.RoleId)))
+            if (co.Deny.HasFlag(flag)) return false;
+
+        foreach (var co in channelOverrides.Where(co => userRoleIds.Contains(co.RoleId)))
+            if (co.Allow.HasFlag(flag)) return true;
+
+        return userRoles.Any(r => r.Permissions.HasFlag(flag));
+    }
+
+    /// <summary>
+    /// Server-wide (not channel-scoped) permission check. Used for things like ManageChannels
+    /// where there's no specific channel context. Admin flag short-circuits.
+    /// </summary>
+    private async Task<bool> HasGlobalPermissionAsync(string username, PermissionFlags flag)
+    {
+        var roles = await GetUserRolesAsync(username);
+        return roles.Any(r =>
+            r.Permissions.HasFlag(PermissionFlags.Administrator) ||
+            r.Permissions.HasFlag(flag));
+    }
+
+    /// <summary>
+    /// "Was this permission explicitly denied here?" — used by default-allow permissions
+    /// (ViewChannel, Speak) which only become restrictive when there's a Deny override.
+    /// </summary>
+    private async Task<bool> IsDeniedByChannelAsync(string username, string channelId, PermissionFlags flag)
+    {
+        var userRoles = await GetUserRolesAsync(username);
+        if (userRoles.Count == 0) return false;
+
+        var channelOverrides = await GetChannelPermissionsAsync(channelId);
+        var userRoleIds = new HashSet<string>(userRoles.Select(r => GetRecordIdString(r.Id)));
+
+        return channelOverrides
+            .Where(co => userRoleIds.Contains(co.RoleId))
+            .Any(co => co.Deny.HasFlag(flag));
+    }
+
+    /// <summary>
+    /// Checks ServerMembers.IsOwner directly. This is the authoritative ownership test —
+    /// independent of the role table, so ownership keeps working even if roles aren't seeded.
+    /// </summary>
+    private async Task<bool> IsServerOwnerAsync(string username)
+    {
+        var userId = $"users:{username.ToLower()}";
+        var members = await _db.Select<ServerMembers>("server_members");
+        return members.Any(m =>
+            string.Equals(m.UserId, userId, StringComparison.OrdinalIgnoreCase) &&
+            m.IsOwner);
+    }
+
+    /// <summary>
+    /// Loads every Role row currently assigned to the user via UserRoles. Empty list if the
+    /// user has no role assignments (which means they implicitly fail every permission check
+    /// unless they happen to be the server owner).
+    /// </summary>
+    private async Task<List<Roles>> GetUserRolesAsync(string username)
+    {
+        var userId = $"users:{username.ToLower()}";
+
+        var userRoleLinks = await _db.Select<UserRoles>("user_roles");
+        var userRoleIds = userRoleLinks
+            .Where(ur => string.Equals(ur.UserId, userId, StringComparison.OrdinalIgnoreCase))
+            .Select(ur => ur.RoleId)
+            .ToHashSet();
+
+        if (userRoleIds.Count == 0) return [];
+
+        var allRoles = await _db.Select<Roles>("roles");
+        return allRoles
+            .Where(r => userRoleIds.Contains(GetRecordIdString(r.Id)))
+            .ToList();
+    }
+
+    /// <summary>Loads every channel_permissions override row for a channel (all roles, all flags).</summary>
+    private async Task<List<ChannelPermissions>> GetChannelPermissionsAsync(string channelId)
+    {
+        var all = await _db.Select<ChannelPermissions>("channel_permissions");
+        return all.Where(cp => cp.ChannelId == channelId).ToList();
+    }
+
+    /// <summary>True if the channel's IsReadOnly flag is set on its row in the channels table.</summary>
+    private async Task<bool> IsChannelReadOnlyAsync(string channelId)
+    {
+        var channels = await _db.Select<Channels>("channels");
+        var channel = channels.FirstOrDefault(c => GetRecordIdString(c.Id) == channelId);
+        return channel?.IsReadOnly ?? false;
+    }
+
+    /// <summary>SurrealDB's Id object → "table:id" string. Local copy because PermissionService isn't a friend of ChatSocketBehavior.</summary>
+    private static string GetRecordIdString(object? id)
+    {
+        if (id is null) return string.Empty;
+        var json = System.Text.Json.JsonSerializer.Serialize(id);
+        using var doc = System.Text.Json.JsonDocument.Parse(json);
+        var root = doc.RootElement;
+        var recordId = root.GetProperty("Id").GetString() ?? string.Empty;
+        var table    = root.GetProperty("Table").GetString() ?? string.Empty;
+        return $"{table}:{recordId}";
+    }
+}

RelayServer/Services/Data/SurrealService.cs

@@ -0,0 +1,21 @@
+using SurrealDb.Net;
+using SurrealDb.Net.Models.Auth;
+
+namespace RelayServer.Services.Data;
+
+public sealed class SurrealService
+{
+    public async Task<SurrealDbClient> ConnectAsync()
+    {
+        var db = new SurrealDbClient("ws://127.0.0.1:8000/rpc");
+
+        await db.SignIn(new RootAuth
+        {
+            Username = "root",
+            Password = "secret"
+        });
+
+        await db.Use("test", "test");
+        return db;
+    }
+}

RelayServer/Services/Rtc/RtcCallService.cs

@@ -0,0 +1,253 @@
+using RelayShared.Rtc;
+using SurrealDb.Net;
+using RelayShared.Rtc;
+
+namespace RelayServer.Services.Rtc;
+
+public sealed class RtcCallService
+{
+    private readonly SurrealDbClient _db;
+
+    public RtcCallService(SurrealDbClient db)
+    {
+        _db = db;
+    }
+
+    /// <summary>
+    /// Checks whether the specified channel currently has an active RTC call.
+    /// </summary>
+    /// <param name="channelId">The channel to inspect.</param>
+    /// <returns>
+    /// True if the channel has an active call; otherwise, false.
+    /// </returns>
+    public async Task<bool> HasActiveCallAsync(string channelId)
+    {
+        var activeCalls = await _db.Select<DBActiveCall>("rtc_active_calls");
+        return activeCalls.Any(x => x.ChannelId == channelId && x.IsActive);
+    }
+    
+    public async Task<DBActiveCall?> GetActiveCallAsync(string channelId)
+    {
+        var activeCalls = await _db.Select<DBActiveCall>("rtc_active_calls");
+        return activeCalls
+            .Where(x => x.ChannelId == channelId && x.IsActive)
+            .OrderByDescending(x => x.UpdatedAt)
+            .FirstOrDefault();
+    }
+
+    /// <summary>
+    /// Creates or updates the current SDP offer for a user in the specified channel.
+    /// If no active call exists for the channel, a new active call is created.
+    /// Otherwise, the existing active call timestamp is refreshed.
+    /// </summary>
+    /// <param name="channelId">The channel the offer belongs to.</param>
+    /// <param name="username">The user creating the offer.</param>
+    /// <param name="type">The RtcSession Type. </param>
+    /// <param name="sdp">The SDP offer payload.</param>
+    public async Task WriteOfferAsync(string channelId, string username, RtcSessionDescription sessionDescription)
+    {
+        var activeCalls = await _db.Select<DBActiveCall>("rtc_active_calls");
+        var activeCall = activeCalls.FirstOrDefault(x => x.ChannelId == channelId && x.IsActive);
+
+        if (activeCall is null)
+        {
+            await _db.Create("rtc_active_calls", new DBActiveCall
+            {
+                ChannelId = channelId,
+                OfferUser = username,
+                Offer = new RtcSessionDescription
+                {
+                    Type = sessionDescription.Type,
+                    Sdp = sessionDescription.Sdp
+                },
+                Answer = null,
+                CreatedAt = DateTime.UtcNow,
+                UpdatedAt = DateTime.UtcNow,
+                IsActive = true
+            });
+
+            return;
+        }
+
+        activeCall.OfferUser = username;
+        activeCall.Offer = new RtcSessionDescription
+        {
+            Type = sessionDescription.Type,
+            Sdp = sessionDescription.Sdp
+        };
+        activeCall.UpdatedAt = DateTime.UtcNow;
+
+        await _db.Merge<DBActiveCall, DBActiveCall>(activeCall);
+    }
+
+    /// <summary>
+    /// Gets the current offer stored on the active call for the specified channel.
+    /// </summary>
+    /// <param name="channelId">The channel whose offer should be retrieved.</param>
+    /// <returns>
+    /// The current offer for the active call, or null if no active call or offer exists.
+    /// </returns>
+    public async Task<RtcSessionDescription?> GetOfferAsync(string channelId)
+    {
+        var activeCall = await GetActiveCallAsync(channelId);
+        return activeCall?.Offer;
+    }
+
+    /// <summary>
+    /// Writes a new SDP answer for the specified channel and refreshes the active call timestamp
+    /// when a matching active call exists.
+    /// </summary>
+    /// <param name="channelId">The channel the answer belongs to.</param>
+    /// <param name="offerUser">The original offer owner.</param>
+    /// <param name="sessionDescription">The SDP and type answer payload.</param>
+    public async Task WriteAnswerAsync(string channelId, RtcSessionDescription sessionDescription)
+    {
+        var activeCalls = await _db.Select<DBActiveCall>("rtc_active_calls");
+        var activeCall = activeCalls.FirstOrDefault(x => x.ChannelId == channelId && x.IsActive);
+
+        if (activeCall is null)
+            return;
+
+        activeCall.Answer = new RtcSessionDescription
+        {
+            Type = sessionDescription.Type,
+            Sdp = sessionDescription.Sdp
+        };
+        activeCall.UpdatedAt = DateTime.UtcNow;
+
+        await _db.Merge<DBActiveCall, DBActiveCall>(activeCall);
+    }
+
+    /// <summary>
+    /// Gets all answers stored for the specified channel in creation order.
+    /// </summary>
+    /// <param name="channelId">The channel whose answers should be retrieved.</param>
+    /// <returns>
+    /// A list of answers for the channel ordered from oldest to newest.
+    /// </returns>
+    public async Task<List<RtcSessionDescription>> GetAnswersAsync(string channelId)
+    {
+        var activeCall = await GetActiveCallAsync(channelId);
+
+        if (activeCall?.Answer is null)
+            return [];
+
+        return [activeCall.Answer];
+    }
+
+    /// <summary>
+    /// Gets the most recent answer stored for the specified channel.
+    /// </summary>
+    /// <param name="channelId">The channel whose latest answer should be retrieved.</param>
+    /// <returns>
+    /// The newest answer for the channel, or null if no answer exists.
+    /// </returns>
+    public async Task<RtcSessionDescription?> GetLatestAnswerAsync(string channelId)
+    {
+        var activeCall = await GetActiveCallAsync(channelId);
+        return activeCall?.Answer;
+    }
+
+    /// <summary>
+    /// Writes a new ICE candidate entry for the specified channel and user.
+    /// </summary>
+    /// <param name="channelId">The channel the ICE candidate belongs to.</param>
+    /// <param name="username">The user who produced the ICE candidate.</param>
+    /// <param name="candidate">The ICE candidate string.</param>
+    /// <param name="sdpMid">The SDP media identifier for the candidate, if any.</param>
+    /// <param name="sdpMLineIndex">The SDP media line index for the candidate, if any.</param>
+    /// <param name="direction">
+    /// The signaling direction the candidate belongs to, such as offer or answer.
+    /// </param>
+    public async Task WriteIceCandidateAsync(
+        string channelId,
+        string username,
+        string candidate,
+        string? sdpMid,
+        int? sdpMLineIndex/*,
+        string direction*/)
+    {
+        await _db.Create("rtc_ice_candidates", new DBIceCandidate
+        {
+            ChannelId = channelId,
+            Username = username,
+            Candidate = candidate,
+            SdpMid = sdpMid,
+            SdpMLineIndex = sdpMLineIndex,
+            // Direction = direction,
+            CreatedAt = DateTime.UtcNow
+        });
+    }
+
+    /// <summary>
+    /// Gets all ICE candidates stored for the specified channel in creation order.
+    /// </summary>
+    /// <param name="channelId">The channel whose ICE candidates should be retrieved.</param>
+    /// <returns>
+    /// A list of ICE candidates for the channel ordered from oldest to newest.
+    /// </returns>
+    public async Task<List<DBIceCandidate>> GetIceCandidatesAsync(string channelId)
+    {
+        var candidates = await _db.Select<DBIceCandidate>("rtc_ice_candidates");
+        return candidates
+            .Where(x => x.ChannelId == channelId)
+            .OrderBy(x => x.CreatedAt)
+            .ToList();
+    }
+
+    /// <summary>
+    /// Gets ICE candidates for the specified channel that were created by other users
+    /// and match the requested signaling direction.
+    /// </summary>
+    /// <param name="channelId">The channel whose ICE candidates should be retrieved.</param>
+    /// <param name="username">The user to exclude from the results.</param>
+    /// <param name="direction">The signaling direction to match.</param>
+    /// <returns>
+    /// A list of matching ICE candidates ordered from oldest to newest.
+    /// </returns>
+    public async Task<List<DBIceCandidate>> GetIceCandidatesForOthersAsync(string channelId, string username, string direction)
+    {
+        var candidates = await _db.Select<DBIceCandidate>("rtc_ice_candidates");
+        return candidates
+            .Where(x => x.ChannelId == channelId && x.Username != username /*&& x.Direction == direction*/)
+            .OrderBy(x => x.CreatedAt)
+            .ToList();
+    }
+
+    /// <summary>
+    /// Leaves the active call for the specified channel. In the current implementation,
+    /// the call is only marked inactive when the offer user leaves.
+    /// </summary>
+    /// <param name="channelId">The channel whose call should be left.</param>
+    /// <param name="username">The user leaving the call.</param>
+    public async Task LeaveCallAsync(string channelId, string username)
+    {
+        var activeCalls = await _db.Select<DBActiveCall>("rtc_active_calls");
+        var activeCall = activeCalls.FirstOrDefault(x => x.ChannelId == channelId && x.IsActive);
+
+        if (activeCall is null)
+            return;
+
+        if (activeCall.OfferUser == username)
+        {
+            activeCall.IsActive = false;
+            activeCall.UpdatedAt = DateTime.UtcNow;
+            await _db.Merge<DBActiveCall, DBActiveCall>(activeCall);
+        }
+    }
+
+    /// <summary>
+    /// Gets all active call records that currently contain an offer.
+    /// </summary>
+    /// <returns>
+    /// A list of active calls with offers, ordered from newest to oldest.
+    /// </returns>
+    public async Task<List<DBActiveCall>> GetOffersAsync()
+    {
+        var activeCalls = await _db.Select<DBActiveCall>("rtc_active_calls");
+        return activeCalls
+            .Where(x => x.Offer is not null)
+            .OrderByDescending(x => x.UpdatedAt)
+            .ToList();
+    }
+}

RelayServer/Services/Rtc/RtcChannelPresenceService.cs

@@ -0,0 +1,67 @@
+using System.Collections.Concurrent;
+
+namespace RelayServer.Services.Rtc;
+
+public static class RtcChannelPresenceService
+{
+    private static readonly ConcurrentDictionary<string, string> SessionToChannel = new();
+    private static readonly ConcurrentDictionary<string, string> SessionToUsername = new();
+
+    public static void SetUser(string sessionId, string username)
+    {
+        SessionToUsername[sessionId] = username;
+    }
+
+    public static void JoinChannel(string sessionId, string channelId)
+    {
+        SessionToChannel[sessionId] = channelId;
+    }
+
+    public static void LeaveChannel(string sessionId)
+    {
+        SessionToChannel.TryRemove(sessionId, out _);
+    }
+
+    public static void RemoveSession(string sessionId)
+    {
+        SessionToChannel.TryRemove(sessionId, out _);
+        SessionToUsername.TryRemove(sessionId, out _);
+    }
+
+    public static IReadOnlyList<string> GetSessionsInChannel(string channelId)
+    {
+        return SessionToChannel
+            .Where(x => x.Value == channelId)
+            .Select(x => x.Key)
+            .ToList();
+    }
+    
+    public static List<string> GetUsernamesInChannel(string channelId)
+    {
+        return GetUsersInChannel(channelId).ToList();
+    }
+
+    public static IReadOnlyList<string> GetUsersInChannel(string channelId)
+    {
+        var sessionIds = GetSessionsInChannel(channelId);
+
+        return sessionIds
+            .Where(id => SessionToUsername.ContainsKey(id))
+            .Select(id => SessionToUsername[id])
+            .Distinct(StringComparer.OrdinalIgnoreCase)
+            .ToList();
+    }
+
+    public static bool IsInChannel(string sessionId, string channelId)
+    {
+        return SessionToChannel.TryGetValue(sessionId, out var currentChannel) &&
+               string.Equals(currentChannel, channelId, StringComparison.Ordinal);
+    }
+    
+    public static string? GetUsernameForSession(string sessionId)
+    {
+        return SessionToUsername.TryGetValue(sessionId, out var username)
+            ? username
+            : null;
+    }
+}

RelayServer/Services/Rtc/RtcNotificationService.cs

@@ -0,0 +1,28 @@
+using System.Text.Json;
+using RelayShared.Rtc;
+using WebSocketSharp.Server;
+
+namespace RelayServer.Services.Rtc;
+
+public static class RtcNotificationService
+{
+    public static WebSocketServer? Server { get; set; }
+
+    public static void BroadcastToChannel(RtcNotificationMessage message)
+    {
+        if (Server is null)
+            return;
+
+        var host = Server.WebSocketServices["/"];
+        if (host is null)
+            return;
+
+        var json = JsonSerializer.Serialize(message);
+        var sessionIds = RtcChannelPresenceService.GetSessionsInChannel(message.ChannelId);
+
+        foreach (var sessionId in sessionIds)
+        {
+            host.Sessions.SendTo(json, sessionId);
+        }
+    }
+}

RelayShared/.gitignore

@@ -0,0 +1,93 @@
+############################################
+# .NET Build
+############################################
+
+bin/
+obj/
+out/
+publish/
+
+############################################
+# Visual Studio
+############################################
+
+.vs/
+*.user
+*.suo
+*.userprefs
+*.csproj.user
+*.dbmdl
+*.cache
+*.pdb
+*.opendb
+
+############################################
+# Rider / JetBrains
+############################################
+
+.idea/
+*.sln.iml
+
+############################################
+# VSCode
+############################################
+
+.vscode/
+
+############################################
+# NuGet
+############################################
+
+*.nupkg
+*.snupkg
+packages/
+.nuget/
+.nuget/packages/
+
+############################################
+# Logs
+############################################
+
+*.log
+logs/
+
+############################################
+# OS files
+############################################
+
+.DS_Store
+Thumbs.db
+
+############################################
+# Local secrets / environment
+############################################
+
+.env
+.env.*
+secrets.json
+appsettings.Development.json
+
+############################################
+# E2EE private keys
+############################################
+
+keys/*
+!keys/.gitkeep
+
+############################################
+# Local test databases / data folders
+############################################
+
+data/
+*.db
+*.sqlite
+*.sqlite3
+
+############################################
+# Temporary files
+############################################
+
+*.tmp
+*.temp
+*.bak
+*.swp

RelayShared/Class1.cs

@@ -0,0 +1,9 @@
+namespace RelayShared;
+
+public class Class1
+{
+    public Class1()
+    {
+        return;
+    }
+}

RelayShared/RelayShared.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="SurrealDb.Net" Version="0.9.0" />
+    </ItemGroup>
+
+</Project>

RelayShared/Rtc/RTCDatabase.cs

@@ -0,0 +1,40 @@
+using SurrealDb.Net.Models;
+
+namespace RelayShared.Rtc;
+
+public sealed class DBActiveCall : Record
+{
+    public string ChannelId { get; set; } = string.Empty;
+    public string? OfferUser { get; set; }
+    public RtcSessionDescription? Offer { get; set; }
+    public RtcSessionDescription? Answer { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+    public bool IsActive { get; set; }
+    public string[] IceCandidates { get; set; } = []; //TODO: Should be array of DBIceCandidates IDs
+}
+
+public sealed class DBOffer : Record
+{
+    public string ChannelId { get; set; } = string.Empty;
+    public string Username { get; set; } = string.Empty;
+    public string Type { get; set; } = string.Empty;
+    public string Sdp { get; set; } = string.Empty;
+}
+public sealed class DBAnswer : Record
+{
+    public string ChannelId { get; set; } = string.Empty;
+    public string Username { get; set; } = string.Empty;
+    public string Type { get; set; } = string.Empty;
+    public string Sdp { get; set; } = string.Empty;
+}
+
+public class DBIceCandidate : Record
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+    public required string Candidate { get; set; }
+    public string? SdpMid { get; set; }
+    public int? SdpMLineIndex { get; set; }
+    public DateTime CreatedAt { get; set; }
+}

RelayShared/Rtc/RTCTransmissions.cs

@@ -0,0 +1,93 @@
+using System.Text.Json.Serialization;
+using RelayShared.Services;
+
+namespace RelayShared.Rtc;
+
+public sealed class RtcSessionDescription
+{
+    public string Type { get; set; } = string.Empty;
+    public string Sdp { get; set; } = string.Empty;
+}
+
+public sealed class RtcOffer
+{
+    public string ChannelId { get; set; } = string.Empty;
+    public string Username { get; set; } = string.Empty;
+    public RtcSessionDescription SessionDescription { get; set; } = new();
+}
+
+public sealed class RtcAnswer
+{
+    public string ChannelId { get; set; } = string.Empty;
+    public string Username { get; set; } = string.Empty;
+    public RtcSessionDescription SessionDescription { get; set; } = new();
+}
+public class RtcIceCandidate
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+    public required IceCandidate Candidate { get; set; }
+}
+
+public class IceCandidate
+{
+    public required string candidate { get; set; }
+    public required string sdpMid { get; set; }
+    public required int sdpMLineIndex { get; set; }
+    public required string usernameFragment { get; set; }
+    
+}
+
+public sealed class RtcJoinRequest
+{
+    public string ChannelId { get; set; } = string.Empty;
+    public string Username { get; set; } = string.Empty;
+}
+
+public sealed class RtcJoinResponse
+{
+    public string ChannelId { get; set; } = string.Empty;
+    public string[] Participants { get; set; } = [];
+}
+
+public sealed class RtcLeaveRequest
+{
+    public string ChannelId { get; set; } = string.Empty;
+    public string Username { get; set; } = string.Empty;
+}
+public sealed class RtcNotificationMessage //TODO: Review for removal
+{
+    public SignalType? Type { get; set; }
+    public string? ChannelId { get; set; }
+    public string? Username { get; set; }
+    public string? Direction { get; set; }
+}
+public sealed class RtcSignalMessage //TODO: Review for removal.
+{
+    [JsonPropertyName("type")]
+    public string Type { get; set; } = string.Empty;
+
+    [JsonPropertyName("from")]
+    public string From { get; set; } = string.Empty;
+
+    [JsonPropertyName("to")]
+    public string To { get; set; } = string.Empty;
+
+    [JsonPropertyName("channelId")]
+    public string ChannelId { get; set; } = string.Empty;
+
+    [JsonPropertyName("sdp")]
+    public string? Sdp { get; set; }
+
+    [JsonPropertyName("candidate")]
+    public string? Candidate { get; set; }
+
+    [JsonPropertyName("sdpMid")]
+    public string? SdpMid { get; set; }
+
+    [JsonPropertyName("sdpMLineIndex")]
+    public int? SdpMLineIndex { get; set; }
+
+    [JsonPropertyName("isInitiator")]
+    public bool IsInitiator { get; set; }
+}

RelayShared/Rtc/RtcServices.cs

@@ -0,0 +1,6 @@
+namespace RelayShared.Rtc;
+
+public class RtcServices
+{
+    
+}

RelayShared/Services/Authentication.cs

@@ -0,0 +1,40 @@
+namespace RelayShared.Services;
+
+public class AuthSignin
+{
+    public string UserName { get; set; }
+    public string Password { get; set; }
+}
+
+public class AuthRegister
+{
+    public string Username { get; set; }
+    public string Password { get; set; }
+    public string Email { get; set; }
+}
+
+public class AuthUserVerify
+{
+    public string Username { get; set; }
+    public string Token { get; set; }
+}
+
+public class AuthServerLicenseVerify
+{
+    public string License { get; set; }
+}
+
+public class AuthServerLicenseGenerate
+{
+    public string Server { get; set; }
+    public string Length {get; set;} //TODO: Convert to Enum
+}
+
+public class DBLicense
+{
+    public string Token {get; set;}
+    public bool IsClient {get; set;}
+    public DateTime CreatedAt {get; set;}
+    public DateTime ExpiresAt {get; set;}
+    public bool IsExpired {get; set;}
+}

RelayShared/Services/ChannelEnums.cs

@@ -0,0 +1,23 @@
+namespace RelayShared.Services;
+
+/// <summary>
+/// Drives both rendering (sidebar icon, message view vs RTC view) and server-side routing
+/// (file mirror destination must be ChannelType.File, RTC join only on Voice/Stage).
+/// </summary>
+public enum ChannelType
+{
+    /// <summary>Default. Linear chat: text, markdown, embeds, attachments. Sidebar prefix "#".</summary>
+    Text,
+
+    /// <summary>WebRTC voice/video. Sidebar prefix 🔊. Selecting auto-swaps to the RTC view.</summary>
+    Voice,
+
+    /// <summary>File browser. Receives auto-mirrored attachments from any Text channel that points here via LinkedFileChannelId. Sidebar prefix 📁.</summary>
+    File,
+
+    /// <summary>Forum-style threaded posts. Sidebar prefix 📋. Currently a placeholder type.</summary>
+    Forum,
+
+    /// <summary>Announcement-style voice. Modified WebRTC where most participants are listeners. Sidebar prefix 🎤. Placeholder.</summary>
+    Stage
+}

RelayShared/Services/ChannelTransmissions.cs

@@ -0,0 +1,44 @@
+namespace RelayShared.Services;
+
+/// <summary>
+/// One row in the sidebar channel list. The server computes the permission-derived fields
+/// (CanPost, CanManage) per-user so the client never has to evaluate permissions itself.
+/// </summary>
+public sealed class ChannelItem
+{
+    /// <summary>Surreal record id (e.g. "channels:abc").</summary>
+    public string ChannelId { get; set; } = string.Empty;
+
+    /// <summary>Sidebar display name ("general", "welcome", etc.).</summary>
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>Drives icon and behavior: Text/Voice/File/Forum/Stage.</summary>
+    public ChannelType Type { get; set; }
+
+    /// <summary>Sidebar category label (e.g. "General"). Empty groups fall under a default "Channels" header.</summary>
+    public string Group { get; set; } = string.Empty;
+
+    /// <summary>Creation timestamp. Drives sidebar sort order (oldest → newest).</summary>
+    public DateTime CreatedAt { get; set; }
+
+    /// <summary>True if the channel is announcement-style (welcome, files). Drives the 🔒 suffix in the sidebar.</summary>
+    public bool IsReadOnly { get; set; }
+
+    /// <summary>Permission-resolved: can the receiving user send messages here. Drives input enable/disable.</summary>
+    public bool CanPost { get; set; }
+
+    /// <summary>Permission-resolved: can the receiving user edit/delete this channel. Drives context-menu visibility.</summary>
+    public bool CanManage { get; set; }
+}
+
+/// <summary>
+/// Server-to-client channel list. Sent in response to WsAction.GetChannels and broadcast
+/// to all sessions after every channel create / delete.
+/// </summary>
+public sealed class SocketChannelList
+{
+    public SignalType Type { get; set; } = SignalType.ChannelList;
+
+    /// <summary>Channels the receiving user is allowed to view. Permission filtering happens server-side.</summary>
+    public List<ChannelItem> Channels { get; set; } = [];
+}

RelayShared/Services/ChatMessageContent.cs

@@ -0,0 +1,43 @@
+namespace RelayShared.Services;
+
+/// <summary>
+/// The plaintext payload of a chat message before E2E encryption is applied.
+///
+/// Lifecycle of a message:
+///   1. Client builds a ChatMessageContent (text + optional reply/attachment/mentions).
+///   2. Client JSON-serialises it, encrypts with the server's public key (RSA wrapping an
+///      AES-GCM key), and sends the encrypted blob wrapped in a SocketEncryptedMessage.
+///   3. Server decrypts with its private key, re-encrypts with the channel DB key, stores it.
+///   4. For each recipient, server decrypts from DB key and re-encrypts with that recipient's
+///      public key, then delivers via SocketEncryptedMessage.
+///   5. Recipient decrypts with their private key and JSON-deserialises back to ChatMessageContent.
+///
+/// This type is intentionally shared by RelayClient and RelayServer so both ends agree on the
+/// JSON shape. Adding a field here lights up the whole pipeline automatically.
+/// </summary>
+public sealed class ChatMessageContent
+{
+    /// <summary>The raw message body, including Markdown syntax and @mentions.</summary>
+    public string Text { get; set; } = string.Empty;
+
+    /// <summary>When set, this message is a reply. Carries the Surreal record id of the message being replied to.</summary>
+    public string? ReplyToId { get; set; }
+
+    /// <summary>Display name of the user being replied to. Lets the client render the quote bar without a lookup.</summary>
+    public string? ReplyToSenderUsername { get; set; }
+
+    /// <summary>Trimmed preview of the replied-to text (≤100 chars). Captured at send time so the server never has to look it up.</summary>
+    public string? ReplyPreview { get; set; }
+
+    /// <summary>Extracted usernames + special tokens ("everyone", "here"). Drives the ping-badge in the sidebar.</summary>
+    public List<string>? Mentions { get; set; }
+
+    /// <summary>Base64-encoded attachment bytes. Null when there's no attachment.</summary>
+    public string? AttachmentBase64 { get; set; }
+
+    /// <summary>MIME type of the attachment (e.g. "image/png"). Used to choose between BuildBase64ImageEmbed and BuildFileCard.</summary>
+    public string? AttachmentMimeType { get; set; }
+
+    /// <summary>Original filename as chosen by the sender. Shown as the file card label and used for the download path.</summary>
+    public string? AttachmentFileName { get; set; }
+}

RelayShared/Services/ConsoleCommandService.cs

@@ -0,0 +1,38 @@
+namespace RelayShared.Services;
+
+public static class ConsoleCommandService
+{
+    public static CancellationTokenSource ShutdownTokenSource { get; } = new();
+
+    public static void Start()
+    {
+        Task.Run(() =>
+        {
+            while (!ShutdownTokenSource.IsCancellationRequested)
+            {
+                var input = Console.ReadLine();
+
+                if (string.IsNullOrWhiteSpace(input))
+                    continue;
+
+                HandleCommand(input.Trim().ToLower());
+            }
+        });
+    }
+
+    private static void HandleCommand(string command)
+    {
+        switch (command)
+        {
+            case "exit":
+            case "stop":
+                Console.WriteLine("Shutting down...");
+                ShutdownTokenSource.Cancel();
+                break;
+
+            default:
+                Console.WriteLine($"Unknown command: {command}");
+                break;
+        }
+    }
+}

RelayShared/Services/SocketTransmissions.cs

@@ -0,0 +1,198 @@
+namespace RelayShared.Services;
+
+//TODO: review name of file, potentially rename for Encryption services rather than sockets
+
+/// <summary>
+/// The "data plane" wire types for the WebSocket protocol.
+///
+/// Every type here carries a SignalType discriminator so a generic JsonDocument peek
+/// can identify the variant. The server dispatches on SignalType in ChatSocketBehavior.OnMessage;
+/// the client dispatches on it in RelaySocketClient.OnMessage.
+///
+/// Encrypted payloads share a uniform 4-tuple shape: (CipherText, Nonce, Tag, EncryptedKey).
+/// That tuple is hybrid RSA+AES-GCM: EncryptedKey is the per-message AES key wrapped with the
+/// recipient's RSA public key; CipherText/Nonce/Tag are the AES-GCM ciphertext, nonce, and
+/// authentication tag for the actual JSON-serialised ChatMessageContent.
+/// </summary>
+public sealed class SocketRtcSignalMessage
+{
+    /// <summary>Always SignalType.EncryptedSignal in flight.</summary>
+    public SignalType Type { get; set; }
+
+    /// <summary>Username of the user generating the SDP/ICE signal.</summary>
+    public string SenderUsername { get; set; } = string.Empty;
+
+    /// <summary>The voice channel this signal belongs to.</summary>
+    public string ChannelId { get; set; } = string.Empty;
+
+    /// <summary>Base64 AES-GCM ciphertext of the JSON-serialised RtcSignalMessage.</summary>
+    public string CipherText { get; set; } = string.Empty;
+
+    /// <summary>Base64 AES-GCM 96-bit nonce.</summary>
+    public string Nonce { get; set; } = string.Empty;
+
+    /// <summary>Base64 AES-GCM 128-bit authentication tag.</summary>
+    public string Tag { get; set; } = string.Empty;
+
+    /// <summary>Base64 RSA-OAEP-encrypted AES key (encrypted with recipient's public key).</summary>
+    public string EncryptedKey { get; set; } = string.Empty;
+}
+
+/// <summary>
+/// The workhorse envelope for chat messages and message lifecycle events.
+/// Used for both directions and for new sends / edits / delete tombstones.
+/// </summary>
+public sealed class SocketEncryptedMessage
+{
+    /// <summary>
+    /// EncryptedChat (server→client), ClientEncryptedChat (client→server new message),
+    /// ClientEditMessage / ClientDeleteMessage (client→server lifecycle), MessageEdited (server→client).
+    /// </summary>
+    public SignalType Type { get; set; } = SignalType.EncryptedChat;
+
+    /// <summary>Surreal record id (e.g. "channel_messages:abc"). Populated by the server on outbound delivery.</summary>
+    public string MessageId { get; set; } = string.Empty;
+
+    /// <summary>Who wrote the message.</summary>
+    public string SenderUsername { get; set; } = string.Empty;
+
+    /// <summary>Who this specific delivery is encrypted for. Different per recipient on the same logical message.</summary>
+    public string RecipientUsername { get; set; } = string.Empty;
+
+    /// <summary>The channel the message belongs to.</summary>
+    public string ChannelId { get; set; } = string.Empty;
+
+    /// <summary>Base64 AES-GCM ciphertext of the JSON-serialised ChatMessageContent. Empty on tombstone deliveries.</summary>
+    public string CipherText { get; set; } = string.Empty;
+
+    /// <summary>Base64 AES-GCM 96-bit nonce.</summary>
+    public string Nonce { get; set; } = string.Empty;
+
+    /// <summary>Base64 AES-GCM 128-bit authentication tag.</summary>
+    public string Tag { get; set; } = string.Empty;
+
+    /// <summary>Base64 RSA-OAEP-encrypted AES key (encrypted with recipient's public key on outbound, server's on inbound).</summary>
+    public string EncryptedKey { get; set; } = string.Empty;
+
+    /// <summary>True when this message has been edited at least once. Drives the (edited) footer in the bubble.</summary>
+    public bool IsEdited { get; set; }
+
+    /// <summary>True for tombstone deliveries (history only). Client renders a placeholder; no decryption is attempted.</summary>
+    public bool IsDeleted { get; set; }
+}
+
+/// <summary>
+/// Server-broadcast tombstone fired the moment a message is deleted. Carries no content —
+/// recipients use MessageId to find the existing bubble and swap it to a "deleted" placeholder.
+/// </summary>
+public sealed class SocketMessageDeletedEvent
+{
+    public SignalType Type { get; set; } = SignalType.MessageDeleted;
+
+    /// <summary>The message being tombstoned.</summary>
+    public string MessageId { get; set; } = string.Empty;
+
+    /// <summary>Channel scope — clients that aren't viewing this channel can defer the bubble update.</summary>
+    public string ChannelId { get; set; } = string.Empty;
+}
+
+/// <summary>
+/// "{Username} is typing…" hint. Server forwards to every connected member except the sender.
+/// Client auto-clears the indicator 3 seconds after the last such event.
+/// </summary>
+public sealed class SocketTypingEvent
+{
+    public SignalType Type { get; set; } = SignalType.TypingIndicator;
+
+    /// <summary>Who is typing.</summary>
+    public string Username { get; set; } = string.Empty;
+
+    /// <summary>Which channel they're typing in. Clients ignore events for channels they're not viewing.</summary>
+    public string ChannelId { get; set; } = string.Empty;
+}
+
+/// <summary>One historical version of an edited message, re-encrypted for the requester.</summary>
+public sealed class SocketEditHistoryEntry
+{
+    /// <summary>Base64 AES-GCM ciphertext of the JSON-serialised previous ChatMessageContent.</summary>
+    public string CipherText { get; set; } = string.Empty;
+
+    public string Nonce { get; set; } = string.Empty;
+    public string Tag { get; set; } = string.Empty;
+
+    /// <summary>Base64 RSA-OAEP-encrypted AES key (encrypted with requester's public key).</summary>
+    public string EncryptedKey { get; set; } = string.Empty;
+
+    /// <summary>When this version was the current text (i.e. when it was replaced).</summary>
+    public DateTime EditedAt { get; set; }
+}
+
+/// <summary>Server reply to a GetEditHistory request. Entries are ordered oldest→newest.</summary>
+public sealed class SocketEditHistoryResponse
+{
+    public SignalType Type { get; set; } = SignalType.EditHistory;
+
+    /// <summary>Which message this history is for.</summary>
+    public string MessageId { get; set; } = string.Empty;
+
+    /// <summary>Every previous version of the message. Empty if the message has never been edited.</summary>
+    public List<SocketEditHistoryEntry> Entries { get; set; } = [];
+}
+
+/// <summary>
+/// Server-to-client delivery of the server's public RSA key. Sent once per session in
+/// response to WsAction.GetServerKey. Clients cache this for all outbound encryption.
+/// </summary>
+public sealed class ServerPublicKeyMessage
+{
+    public SignalType Type { get; set; } = SignalType.ServerPublicKey;
+
+    /// <summary>Base64 SubjectPublicKeyInfo (DER) of the server's RSA public key.</summary>
+    public string PublicKey { get; set; } = string.Empty;
+}
+
+/// <summary>The wire discriminator for every data-plane Socket*Message.</summary>
+public enum SignalType
+{
+    // RTC SDP/ICE wire types (used by the WebView RTC engine, not handled directly here)
+    Offer,
+    Answer,
+    Candidate,
+    OfferUpdated,
+    AnswerUpdated,
+    CandidateAdded,
+    CallLeft,
+
+    /// <summary>Server→client: paginated channel list (SocketChannelList).</summary>
+    ChannelList,
+
+    /// <summary>Server→client: ServerPublicKeyMessage delivery.</summary>
+    ServerPublicKey,
+
+    /// <summary>Bidirectional: encrypted RTC SDP/ICE signal (SocketRtcSignalMessage).</summary>
+    EncryptedSignal,
+
+    /// <summary>Server→client: delivered chat message (SocketEncryptedMessage).</summary>
+    EncryptedChat,
+
+    /// <summary>Client→server: new chat message send (SocketEncryptedMessage).</summary>
+    ClientEncryptedChat,
+
+    /// <summary>Client→server: request to edit own message (SocketEncryptedMessage with new content).</summary>
+    ClientEditMessage,
+
+    /// <summary>Client→server: request to delete own message (SocketEncryptedMessage with only MessageId).</summary>
+    ClientDeleteMessage,
+
+    /// <summary>Server→clients: edit broadcast carrying re-encrypted new content (SocketEncryptedMessage).</summary>
+    MessageEdited,
+
+    /// <summary>Server→clients: deletion tombstone (SocketMessageDeletedEvent).</summary>
+    MessageDeleted,
+
+    /// <summary>Server→peers: typing indicator (SocketTypingEvent).</summary>
+    TypingIndicator,
+
+    /// <summary>Server→requester: edit-history response (SocketEditHistoryResponse).</summary>
+    EditHistory
+}

RelayShared/Services/WsControlMessage.cs

@@ -0,0 +1,111 @@
+namespace RelayShared.Services;
+
+/// <summary>
+/// JSON-dispatch contract for the WebSocket "control plane" (non-encrypted,
+/// non-realtime requests like auth, key registration, channel CRUD, history fetches).
+///
+/// The server's ChatSocketBehavior.OnMessage looks at the first JSON property of every
+/// incoming text frame:
+///   - "Action" present → deserialise into WsControlMessage and dispatch on WsAction.
+///   - "Type" present   → deserialise into SocketEncryptedMessage/SocketRtcSignalMessage
+///                        and dispatch on SignalType (the "data plane" — chat messages,
+///                        RTC signals, edit/delete requests).
+///
+/// Responses come back as either WsEventMessage (for acks/errors) or one of the
+/// Socket*Message types (for streaming data).
+/// </summary>
+public enum WsAction
+{
+    /// <summary>Verify a Core-issued user token. Fields used: Username, Token.</summary>
+    Authenticate,
+
+    /// <summary>Register/update the client's RSA public key. Fields used: Username, PublicKey.</summary>
+    RegisterKey,
+
+    /// <summary>Request the server's public RSA key for outbound encryption. No fields.</summary>
+    GetServerKey,
+
+    /// <summary>Request the full channel list for this user. No fields.</summary>
+    GetChannels,
+
+    /// <summary>Request decrypted message history for a channel. Fields used: Username, ChannelId.</summary>
+    GetHistory,
+
+    /// <summary>Join a voice channel (presence tracking). Fields used: Username, ChannelId.</summary>
+    RtcJoin,
+
+    /// <summary>Leave a voice channel. Fields used: Username, ChannelId.</summary>
+    RtcLeave,
+
+    /// <summary>Broadcast "user is typing" to channel peers. Fields used: ChannelId.</summary>
+    SendTyping,
+
+    /// <summary>Request the edit-history chain for a specific message. Fields used: Username, MessageId, ChannelId.</summary>
+    GetEditHistory,
+
+    /// <summary>Create a new channel (permission-gated). Fields used: ChannelName, ChannelType, ChannelGroup.</summary>
+    CreateChannel,
+
+    /// <summary>Soft-delete a channel (permission-gated). Fields used: ChannelId.</summary>
+    DeleteChannel
+}
+
+/// <summary>Server-to-client event types for acks and errors.</summary>
+public enum WsEvent
+{
+    /// <summary>Reply to Authenticate. Detail = username.</summary>
+    Authenticated,
+
+    /// <summary>Reply to RegisterKey. Detail = username.</summary>
+    KeyRegistered,
+
+    /// <summary>Generic error. Detail = human-readable reason shown to the user.</summary>
+    Error
+}
+
+/// <summary>
+/// Control-plane envelope. All fields are nullable because each action only uses a subset
+/// of them. Serialised as JSON; identified by the presence of the "Action" property.
+/// </summary>
+public sealed class WsControlMessage
+{
+    /// <summary>The action to perform. Server dispatches on this.</summary>
+    public WsAction Action { get; set; }
+
+    /// <summary>Mixed-case username as the user typed it on sign-in. Server preserves casing for display.</summary>
+    public string? Username { get; set; }
+
+    /// <summary>Core-issued auth token. Only set on Authenticate.</summary>
+    public string? Token { get; set; }
+
+    /// <summary>Base64-encoded RSA public key. Only set on RegisterKey.</summary>
+    public string? PublicKey { get; set; }
+
+    /// <summary>Surreal record id of a channel (e.g. "channels:xyz"). Used by most channel-scoped actions.</summary>
+    public string? ChannelId { get; set; }
+
+    /// <summary>Surreal record id of a message. Used by GetEditHistory.</summary>
+    public string? MessageId { get; set; }
+
+    /// <summary>Channel name on create (e.g. "memes"). Server normalises to lowercase-dashes.</summary>
+    public string? ChannelName { get; set; }
+
+    /// <summary>Integer cast of ChannelType enum (Text=0, Voice=1, …). Used on CreateChannel.</summary>
+    public int ChannelType { get; set; }
+
+    /// <summary>Group/category label shown in the sidebar (e.g. "General"). Optional on CreateChannel.</summary>
+    public string? ChannelGroup { get; set; }
+}
+
+/// <summary>
+/// Server-to-client ack envelope. Identified by the "Event" JSON property
+/// (vs WsControlMessage's "Action" or Socket*Message's "Type").
+/// </summary>
+public sealed class WsEventMessage
+{
+    /// <summary>Which event this is acknowledging.</summary>
+    public WsEvent Event { get; set; }
+
+    /// <summary>Human-readable context (username on success, error message on Error).</summary>
+    public string? Detail { get; set; }
+}

UI Design Doc outline.md

@@ -0,0 +1,47 @@
+Server Profile:
+    - Server Name
+    - Server Image
+    - Selection Arrow
+    - Server specific settings (notifications, DMs, Admin settings link)
+
+Member Server Settings: [shown only when selecting a member from member list]
+    - Settings for selected Member
+    - Mute and Deafen for voice channels
+    - Nickname editing
+    - Global Username
+    - View profile
+    - Member statuses (full length)
+    - Permissions editing (for admins)
+
+User Profile and Channel Controls:
+    - User settings button
+    - Profile
+    - Mute and deafen for voice channels
+    - Connection details for voice call
+    - Disconnect for voice calls
+    - Share screens in voice channels
+    - Camera controls in voice channels
+
+Members List:
+    - Member tile with Username/Nickname
+    - Status
+    - Profile
+    - Colored based on Assigned roles
+
+Channels List:
+    - Channel Name
+    - Icon for channel type [Forum, Stage, Text, Voice/Video, File]
+    - Colored based on assigned roles
+    - Hidden based on assigned roles
+
+Channel Specific Info:
+    - Channel Type
+    - Notification settings (specific to channel)
+    - Permission editing (for admins)
+    - Invite Link
+    - Channel Settings
+
+General UI Needs:
+    - Icons for individual controls
+    - Design docs
+    - General design for all lists [text, file, forum, members, channels]

dev-run.ps1

@@ -0,0 +1,123 @@
+$root = Split-Path -Parent $MyInvocation.MyCommand.Path
+Set-Location $root
+
+$startedProcesses = @()
+
+function Start-TrackedProcess {
+    param(
+        [string]$FilePath,
+        [string[]]$ArgumentList = @(),
+        [string]$WorkingDirectory = $root
+    )
+
+    $proc = Start-Process -FilePath $FilePath `
+        -ArgumentList $ArgumentList `
+        -WorkingDirectory $WorkingDirectory `
+        -PassThru
+
+    $script:startedProcesses += $proc
+    return $proc
+}
+
+function Stop-AllTrackedProcesses {
+    Write-Host ""
+    Write-Host "Stopping launched processes..."
+
+    foreach ($proc in $script:startedProcesses) {
+        try {
+            if ($proc -and -not $proc.HasExited) {
+                Stop-Process -Id $proc.Id -Force -ErrorAction SilentlyContinue
+                Write-Host "Stopped PID $($proc.Id)"
+            }
+        }
+        catch {
+        }
+    }
+
+    try {
+        $containerIds = docker ps --filter "ancestor=surrealdb/surrealdb:v2.2.1" --format "{{.ID}}"
+        foreach ($id in $containerIds) {
+            docker stop $id | Out-Null
+            Write-Host "Stopped Docker container $id"
+        }
+    }
+    catch {
+    }
+}
+
+Register-EngineEvent PowerShell.Exiting -Action {
+    Stop-AllTrackedProcesses
+} | Out-Null
+
+Write-Host "Building RelayCore..."
+dotnet build .\RelayCore\RelayCore.csproj
+if ($LASTEXITCODE -ne 0) { throw "RelayCore build failed." }
+
+Write-Host "Building RelayServer..."
+dotnet build .\RelayServer\RelayServer.csproj
+if ($LASTEXITCODE -ne 0) { throw "RelayServer build failed." }
+
+Write-Host "Building RelayClient (Windows only)..."
+dotnet build .\RelayClient\RelayClient.csproj -f net10.0-windows10.0.19041.0
+if ($LASTEXITCODE -ne 0) { throw "RelayClient build failed." }
+
+$coreDll = Join-Path $root "RelayCore\bin\Debug\net9.0\RelayCore.dll"
+$serverDll = Join-Path $root "RelayServer\bin\Debug\net10.0\RelayServer.dll"
+$clientExe = Join-Path $root "RelayClient\bin\Debug\net10.0-windows10.0.19041.0\win-x64\RelayClient.exe"
+
+Write-Host "Starting SurrealDB..."
+Start-TrackedProcess `
+    -FilePath "docker" `
+    -ArgumentList @(
+    "run",
+    "--rm",
+    "-p", "8000:8000",
+    "-v", "/mydata:/mydata",
+    "surrealdb/surrealdb:v2.2.1",
+    "start",
+    "--user", "root",
+    "--pass", "secret"
+)
+
+Start-Sleep -Seconds 5
+
+Write-Host "Starting RelayCore..."
+Start-TrackedProcess `
+    -FilePath "dotnet" `
+    -ArgumentList @($coreDll)
+
+Start-Sleep -Seconds 3
+
+Write-Host "Starting RelayServer..."
+Start-TrackedProcess `
+    -FilePath "dotnet" `
+    -ArgumentList @($serverDll)
+
+Start-Sleep -Seconds 3
+
+Write-Host "Starting RelayClient (Keeper317)..."
+Start-TrackedProcess `
+    -FilePath $clientExe `
+    -ArgumentList @("--user", "Keeper317")
+
+Start-Sleep -Seconds 1
+
+Write-Host "Starting RelayClient (Ru_Kira)..."
+Start-TrackedProcess `
+    -FilePath $clientExe `
+    -ArgumentList @("--user", "Ru_Kira")
+
+Start-Sleep -Seconds 20
+
+Write-Host "Starting RelayClient (Test)..."
+Start-TrackedProcess `
+    -FilePath $clientExe `
+    -ArgumentList @("--user", "Test")
+
+Write-Host "" 
+Write-Host "Everything started." 
+Write-Host "Press Ctrl+C in this PowerShell to stop everything."
+
+while ($true) {
+    Start-Sleep -Seconds 1
+}

start-all.ps1

@@ -0,0 +1,85 @@
+$root = Split-Path -Parent $MyInvocation.MyCommand.Path
+Set-Location $root
+
+$dockerExe = (Get-Command docker.exe).Source
+$dotnetExe = (Get-Command dotnet.exe).Source
+$ps = (Get-Command powershell.exe).Source
+
+Write-Host "Building RelayCore..."
+& $dotnetExe build .\RelayCore\RelayCore.csproj
+if ($LASTEXITCODE -ne 0) { throw "RelayCore build failed." }
+
+Write-Host "Building RelayServer..."
+& $dotnetExe build .\RelayServer\RelayServer.csproj
+if ($LASTEXITCODE -ne 0) { throw "RelayServer build failed." }
+
+Write-Host "Building RelayClient (Windows only)..."
+& $dotnetExe build .\RelayClient\RelayClient.csproj -f net10.0-windows10.0.19041.0
+if ($LASTEXITCODE -ne 0) { throw "RelayClient build failed." }
+
+$coreDll   = Join-Path $root "RelayCore\bin\Debug\net9.0\RelayCore.dll"
+$serverDll = Join-Path $root "RelayServer\bin\Debug\net10.0\RelayServer.dll"
+$clientExe = Join-Path $root "RelayClient\bin\Debug\net10.0-windows10.0.19041.0\win-x64\RelayClient.exe"
+
+$tempDir = Join-Path $env:TEMP "RelayTabs"
+New-Item -ItemType Directory -Force -Path $tempDir | Out-Null
+
+function New-TabScript {
+    param(
+        [string]$Name,
+        [string]$Content
+    )
+
+    $path = Join-Path $tempDir "$Name.ps1"
+    Set-Content -Path $path -Value $Content -Encoding UTF8
+    return $path
+}
+
+$dockerScript = New-TabScript -Name "SurrealDB" -Content @"
+Set-Location '$root'
+& '$dockerExe' run --rm -p 8000:8000 -v /mydata:/mydata surrealdb/surrealdb:v2.2.1 start --user root --pass secret
+"@
+
+$coreScript = New-TabScript -Name "RelayCore" -Content @"
+Set-Location '$root'
+Start-Sleep -Seconds 1
+& '$dotnetExe' '$coreDll'
+"@
+
+$serverScript = New-TabScript -Name "RelayServer" -Content @"
+Set-Location '$root'
+Start-Sleep -Seconds 1
+& '$dotnetExe' '$serverDll'
+"@
+
+$keeperScript = New-TabScript -Name "Keeper317" -Content @"
+Set-Location '$root'
+Start-Sleep -Seconds 5
+& '$clientExe' --user Keeper317
+"@
+
+$kiraScript = New-TabScript -Name "Ru_Kira" -Content @"
+Set-Location '$root'
+Start-Sleep -Seconds 5
+& '$clientExe' --user Ru_Kira
+"@
+
+$testScript = New-TabScript -Name "Test" -Content @"
+Set-Location '$root'
+Start-Sleep -Seconds 5
+& '$clientExe' --user Test
+"@
+
+$wtArgs = @(
+    "new-tab --title `"SurrealDB`" `"$ps`" -NoExit -ExecutionPolicy Bypass -File `"$dockerScript`"",
+    "new-tab --title `"RelayCore`" `"$ps`" -NoExit -ExecutionPolicy Bypass -File `"$coreScript`"",
+    "new-tab --title `"RelayServer`" `"$ps`" -NoExit -ExecutionPolicy Bypass -File `"$serverScript`"",
+    "new-tab --title `"Keeper317`" `"$ps`" -NoExit -ExecutionPolicy Bypass -File `"$keeperScript`"",
+    "new-tab --title `"Test`" `"$ps`" -NoExit -ExecutionPolicy Bypass -File `"$testScript`"",
+    "new-tab --title `"Ru_Kira`" `"$ps`" -NoExit -ExecutionPolicy Bypass -File `"$kiraScript`""
+) -join " ; "
+
+Write-Host ""
+Write-Host "Everything started."
+Write-Host "Close out terminal to end all applications."
+Start-Process wt.exe -ArgumentList $wtArgs

start-servers.ps1

@@ -0,0 +1,63 @@
+$root = Split-Path -Parent $MyInvocation.MyCommand.Path
+Set-Location $root
+
+$dockerExe = (Get-Command docker.exe).Source
+$dotnetExe = (Get-Command dotnet.exe).Source
+$ps = (Get-Command powershell.exe).Source
+
+Write-Host "Building RelayCore..."
+& $dotnetExe build .\RelayCore\RelayCore.csproj
+if ($LASTEXITCODE -ne 0) { throw "RelayCore build failed." }
+
+Write-Host "Building RelayServer..."
+& $dotnetExe build .\RelayServer\RelayServer.csproj
+if ($LASTEXITCODE -ne 0) { throw "RelayServer build failed." }
+
+Write-Host "Building RelayClient (Windows only)..."
+& $dotnetExe build .\RelayClient\RelayClient.csproj -f net10.0-windows10.0.19041.0
+if ($LASTEXITCODE -ne 0) { throw "RelayClient build failed." }
+
+$coreDll   = Join-Path $root "RelayCore\bin\Debug\net9.0\RelayCore.dll"
+$serverDll = Join-Path $root "RelayServer\bin\Debug\net10.0\RelayServer.dll"
+
+$tempDir = Join-Path $env:TEMP "RelayTabs"
+New-Item -ItemType Directory -Force -Path $tempDir | Out-Null
+
+function New-TabScript {
+    param(
+        [string]$Name,
+        [string]$Content
+    )
+
+    $path = Join-Path $tempDir "$Name.ps1"
+    Set-Content -Path $path -Value $Content -Encoding UTF8
+    return $path
+}
+
+$dockerScript = New-TabScript -Name "SurrealDB" -Content @"
+Set-Location '$root'
+& '$dockerExe' run --rm -p 8000:8000 -v /mydata:/mydata surrealdb/surrealdb:v2.2.1 start --user root --pass secret
+"@
+
+$coreScript = New-TabScript -Name "RelayCore" -Content @"
+Set-Location '$root'
+Start-Sleep -Seconds 1
+& '$dotnetExe' '$coreDll'
+"@
+
+$serverScript = New-TabScript -Name "RelayServer" -Content @"
+Set-Location '$root'
+Start-Sleep -Seconds 1
+& '$dotnetExe' '$serverDll'
+"@
+
+$wtArgs = @(
+    "new-tab --title `"SurrealDB`" `"$ps`" -NoExit -ExecutionPolicy Bypass -File `"$dockerScript`"",
+    "new-tab --title `"RelayCore`" `"$ps`" -NoExit -ExecutionPolicy Bypass -File `"$coreScript`"",
+    "new-tab --title `"RelayServer`" `"$ps`" -NoExit -ExecutionPolicy Bypass -File `"$serverScript`""
+) -join " ; "
+
+Write-Host ""
+Write-Host "Everything started."
+Write-Host "Close out terminal to end all applications."
+Start-Process wt.exe -ArgumentList $wtArgs