482 lines
15 KiB
C#
482 lines
15 KiB
C#
using RelayClient.Crypto;
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using RelayClient.Models;
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using WebSocketSharp;
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using System.Text.Json;
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namespace RelayClient;
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public partial class MainPage : ContentPage
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{
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private readonly string _username;
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private readonly WebSocket _wsc;
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private string? _serverPublicKey;
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private string? _currentChannelId;
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private string? _currentChannelName;
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private readonly Dictionary<string, List<ChatMessage>> _messagesByChannel = new();
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private readonly List<ChannelItem> _channels = [];
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public MainPage(string username)
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{
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InitializeComponent();
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_username = username;
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UserLabel.Text = $"Logged in as: {_username}";
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if (!KeyStorage.HasKeys(_username))
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{
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var keys = E2EeHelper.GenerateRsaKeyPair();
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KeyStorage.SavePrivateKey(_username, keys.privateKey);
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KeyStorage.SavePublicKey(_username, keys.publicKey);
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}
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_wsc = new WebSocket("ws://localhost:1337/");
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_wsc.OnMessage += WscOnMessage;
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_wsc.Connect();
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var publicKey = KeyStorage.LoadPublicKey(_username);
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_wsc.Send($"REGISTER_KEY|{_username}|{publicKey}");
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_wsc.Send("GET_SERVER_KEY");
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_wsc.Send("GET_CHANNELS");
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hybridWebView.SetInvokeJavaScriptTarget(this);
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ServerAPI.setupClient();
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}
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private void SendButton_OnClicked(object? sender, EventArgs e)
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{
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SendMessage();
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}
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private void MessageEntry_OnCompleted(object? sender, EventArgs e)
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{
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SendMessage();
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}
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private void SendMessage()
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{
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var text = MessageEntry.Text?.Trim();
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if (string.IsNullOrWhiteSpace(text))
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return;
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if (string.IsNullOrWhiteSpace(_serverPublicKey))
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{
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Console.WriteLine("Server public key not loaded yet.");
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return;
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}
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if (string.IsNullOrWhiteSpace(_currentChannelId))
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{
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Console.WriteLine("No channel selected yet.");
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return;
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}
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var encrypted = E2EeHelper.EncryptForRecipient(text, _serverPublicKey);
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var payload = new SocketEncryptedMessage
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{
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ChannelId = _currentChannelId!,
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Type = "client_encrypted_chat",
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SenderUsername = _username,
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CipherText = encrypted.CipherText,
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Nonce = encrypted.Nonce,
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Tag = encrypted.Tag,
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EncryptedKey = encrypted.EncryptedKey
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};
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var json = JsonSerializer.Serialize(payload);
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_wsc.Send(json);
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Console.WriteLine($"[{_username}] sent encrypted message.");
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MessageEntry.Text = string.Empty;
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MessageEntry.Focus();
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}
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private void WscOnMessage(object? sender, MessageEventArgs e)
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{
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if (e.Data.StartsWith("SERVER:REGISTERED_KEY:"))
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{
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Console.WriteLine(e.Data);
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return;
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}
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hybridWebView.SendRawMessage($"[{_username}] RAW WS DATA {e.Data}");
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Console.WriteLine($"[{_username}] RAW WS DATA: {e.Data}");
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try
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{
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using var doc = JsonDocument.Parse(e.Data);
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var root = doc.RootElement;
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if (!root.TryGetProperty("Type", out var typeElement))
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return;
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var type = typeElement.GetString();
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if (type == "channel_list")
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{
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var channelList = JsonSerializer.Deserialize<SocketChannelList>(e.Data);
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if (channelList is null)
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return;
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_channels.Clear();
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_channels.AddRange(channelList.Channels.OrderBy(c => c.CreatedAt));
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var defaultChannel = _channels
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.Where(c => c.Name.Equals("welcome", StringComparison.OrdinalIgnoreCase))
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.OrderBy(c => c.CreatedAt)
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.FirstOrDefault()
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?? _channels.OrderBy(c => c.CreatedAt).FirstOrDefault();
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if (defaultChannel is not null)
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{
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_currentChannelId = defaultChannel.ChannelId;
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_currentChannelName = defaultChannel.Name;
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MainThread.BeginInvokeOnMainThread(async () =>
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{
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ChannelLabel.Text = $"#{_currentChannelName}";
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RenderChannelList();
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await PushRtcContextToJsAsync();
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});
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_wsc.Send($"GET_HISTORY|{_username}|{_currentChannelId}");
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}
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return;
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}
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if (type == "server_public_key")
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{
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var serverKeyMessage = JsonSerializer.Deserialize<ServerPublicKeyMessage>(e.Data);
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if (serverKeyMessage is not null)
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{
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_serverPublicKey = serverKeyMessage.PublicKey;
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Console.WriteLine($"[{_username}] loaded server public key.");
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}
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return;
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}
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if (type == "encrypted_rtc_signal")
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{
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var payload = JsonSerializer.Deserialize<SocketRtcSignalMessage>(e.Data);
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if (payload is null)
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return;
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if (payload.ChannelId != _currentChannelId)
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return;
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if (payload.SenderUsername == _username)
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return;
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var privateKey = KeyStorage.LoadPrivateKey(_username);
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var decryptedJson = E2EeHelper.DecryptForRecipient(
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new EncryptedPayload
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{
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CipherText = payload.CipherText,
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Nonce = payload.Nonce,
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Tag = payload.Tag,
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EncryptedKey = payload.EncryptedKey
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},
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privateKey
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);
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MainThread.BeginInvokeOnMainThread(async () =>
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{
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await SendRtcSignalToJsAsync(decryptedJson);
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});
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return;
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}
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if (type != "encrypted_chat")
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return;
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var pyload = JsonSerializer.Deserialize<SocketEncryptedMessage>(e.Data);
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if (pyload is null)
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return;
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if (pyload.RecipientUsername != _username)
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return;
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Console.WriteLine($"[{_username}] received encrypted payload for {pyload.RecipientUsername}");
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var privKey = KeyStorage.LoadPrivateKey(_username);
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var decryptedText = E2EeHelper.DecryptForRecipient(
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new EncryptedPayload
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{
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CipherText = pyload.CipherText,
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Nonce = pyload.Nonce,
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Tag = pyload.Tag,
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EncryptedKey = pyload.EncryptedKey
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},
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privKey
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);
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Console.WriteLine($"[{_username}] decrypted message from {pyload.SenderUsername}: {decryptedText}");
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var message = new ChatMessage
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{
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SenderUsername = pyload.SenderUsername,
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Text = decryptedText,
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Timestamp = DateTime.Now
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};
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if (!_messagesByChannel.ContainsKey(pyload.ChannelId))
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{
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_messagesByChannel[pyload.ChannelId] = [];
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}
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_messagesByChannel[pyload.ChannelId].Add(message);
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if (pyload.ChannelId == _currentChannelId)
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{
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MainThread.BeginInvokeOnMainThread(() =>
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{
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RenderSingleMessage(message);
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});
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}
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}
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catch (Exception ex)
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{
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Console.WriteLine($"[{_username}] failed to process websocket message: {ex.Message}");
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}
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}
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protected override void OnDisappearing()
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{
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_wsc.OnMessage -= WscOnMessage;
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_wsc.Close();
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base.OnDisappearing();
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}
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private void RenderChannelList()
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{
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SidebarList.Children.Clear();
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foreach (var channel in _channels.OrderBy(c => c.CreatedAt))
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{
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var button = new Button
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{
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Text = $"#{channel.Name}"
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};
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button.Clicked += (_, _) =>
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{
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_currentChannelId = channel.ChannelId;
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_currentChannelName = channel.Name;
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MainThread.BeginInvokeOnMainThread(async () =>
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{
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await PushRtcContextToJsAsync();
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});
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ChannelLabel.Text = $"#{_currentChannelName}";
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RenderCurrentChannelMessages();
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if (!_messagesByChannel.ContainsKey(channel.ChannelId))
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{
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_wsc.Send($"GET_HISTORY|{_username}|{channel.ChannelId}");
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}
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};
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SidebarList.Children.Add(button);
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}
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}
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private void RenderCurrentChannelMessages()
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{
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MessagesLayout.Children.Clear();
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if (_currentChannelId is null)
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return;
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if (!_messagesByChannel.TryGetValue(_currentChannelId, out var messages))
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return;
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foreach (var message in messages.OrderBy(m => m.Timestamp))
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{
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RenderSingleMessage(message);
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}
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}
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private async void RenderSingleMessage(ChatMessage message)
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{
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bool isOwnMessage = message.SenderUsername == _username;
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var bubble = new Border
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{
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StrokeThickness = 1,
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Padding = 10,
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Margin = isOwnMessage
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? new Thickness(40, 0, 0, 0)
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: new Thickness(0, 0, 40, 0),
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HorizontalOptions = isOwnMessage
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? LayoutOptions.End
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: LayoutOptions.Start,
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Content = new VerticalStackLayout
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{
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Spacing = 2,
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Children =
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{
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new Label { Text = message.SenderUsername, FontAttributes = FontAttributes.Bold, FontSize = 12 },
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new Label { Text = message.Text, FontSize = 14 },
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new Label { Text = message.Timestamp.ToString("h:mm tt"), FontSize = 10 }
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}
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}
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};
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MessagesLayout.Children.Add(bubble);
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await MessagesScrollView.ScrollToAsync(MessagesLayout, ScrollToPosition.End, true);
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}
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private void SwapView_OnClicked(object? sender, EventArgs e)
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{
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if (RtcView.IsVisible)
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{
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MessagesScrollView.IsVisible = true;
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RtcView.IsVisible = false;
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ViewSwapped.Text = "Swap to Web View";
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}
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else
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{
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MessagesScrollView.IsVisible = false;
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RtcView.IsVisible = true;
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ViewSwapped.Text = "Swap to Message View";
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}
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}
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public async Task<bool> JoinRtcChannel()
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{
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//TODO: get bool value for if channel ID has an active call
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//TODO: Join RTC using current channel ID
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hybridWebView.SendRawMessage($"Attempting to join RTC Channel {_currentChannelName}");
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bool active = await ServerAPI.GetIsChannelActiveAsync(_currentChannelId);
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hybridWebView.SendRawMessage($"Rtc Channel {_currentChannelName} is active: {active}");
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return active;
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//await hybridWebView.EvaluateJavaScriptAsync($"window.channelCallJoin({active})");
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}
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public async void WriteRtcOffer(string json)
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{
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try
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{
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RtcDescription? description = JsonSerializer.Deserialize<RtcDescription>(json);
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DBOffer offer = new DBOffer
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{
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ChannelId = _currentChannelId,
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Username = _username,
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SessionDescription = description
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};
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await ServerAPI.PostOfferAsync(offer);
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}
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catch (Exception ex)
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{
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hybridWebView.SendRawMessage(ex.Message);
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}
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}
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public async Task<string> GetRtcOffer()
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{
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RtcDescription? offer = await ServerAPI.GetOffersForChannelAsync(_currentChannelId);
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return JsonSerializer.Serialize(offer);
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}
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public async void WriteRtcAnswer(string json)
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{
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RtcDescription? description = JsonSerializer.Deserialize<RtcDescription>(json);
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DBOffer answer = new DBOffer
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{
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ChannelId = _currentChannelId,
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Username = _username,
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SessionDescription = description
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};
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await ServerAPI.PostAnswerAsync(answer);
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}
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public async void AnswerCallback(RtcDescription answer)
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{
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await hybridWebView.EvaluateJavaScriptAsync($"window.AnswerCallback({answer})");
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}
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private void OnSendMessageButtonClicked(object sender, EventArgs e)
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{
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hybridWebView.SendRawMessage($"Hello from C#!");
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}
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private async void OnHybridWebViewRawMessageReceived(object sender, HybridWebViewRawMessageReceivedEventArgs e)
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{
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if (e.Message == "rtc_page_ready")
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{
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await PushRtcContextToJsAsync();
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return;
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}
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await DisplayAlertAsync("Raw Message Received", e.Message, "OK");
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}
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public void SendRtcSignal(string json)
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{
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if (string.IsNullOrWhiteSpace(_serverPublicKey))
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{
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Console.WriteLine("Server public key not loaded yet.");
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return;
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}
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RtcSignalMessage? rtcSignal;
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try
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{
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rtcSignal = JsonSerializer.Deserialize<RtcSignalMessage>(json);
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Failed to parse RTC signal from JS: {ex.Message}");
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return;
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}
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if (rtcSignal is null)
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return;
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var encrypted = E2EeHelper.EncryptForRecipient(json, _serverPublicKey);
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var payload = new SocketRtcSignalMessage
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{
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Type = "encrypted_rtc_signal",
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SenderUsername = _username,
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ChannelId = rtcSignal.ChannelId,
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CipherText = encrypted.CipherText,
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Nonce = encrypted.Nonce,
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Tag = encrypted.Tag,
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EncryptedKey = encrypted.EncryptedKey
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};
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_wsc.Send(JsonSerializer.Serialize(payload));
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Console.WriteLine($"[{_username}] sent RTC signal: {rtcSignal.Type} -> {rtcSignal.ChannelId}");
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}
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private async Task SendRtcSignalToJsAsync(string rawJson)
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{
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var jsArg = JsonSerializer.Serialize(rawJson);
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await hybridWebView.EvaluateJavaScriptAsync($"window.handleRtcSignal({jsArg})");
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}
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private async Task PushRtcContextToJsAsync()
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{
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var usernameJson = JsonSerializer.Serialize(_username);
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var channelIdJson = JsonSerializer.Serialize(_currentChannelId);
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await hybridWebView.EvaluateJavaScriptAsync($"window.setUsername({usernameJson})");
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await hybridWebView.EvaluateJavaScriptAsync($"window.setChannelId({channelIdJson})");
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Console.WriteLine($"[{_username}] pushed RTC context into HybridWebView.");
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}
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} |