working on server authenticate users

RelayClient/ServerAPI.cs

@@ -1,18 +1,49 @@
 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://localhost:5000/") };
+    static HttpClient client = new HttpClient { BaseAddress = new Uri("http://192.168.1.85:5000/") };
+    static HttpClient core = new HttpClient { BaseAddress = new Uri("http://192.168.1.85:1337/") };
     
-    public static void setupClient()
+    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)