1 files changed, 96 insertions, 0 deletions
diff --git a/LibMatrix/Services/HomeserverProviderService.cs b/LibMatrix/Services/HomeserverProviderService.cs
new file mode 100644
index 0000000..61c449a
--- /dev/null
+++ b/LibMatrix/Services/HomeserverProviderService.cs
@@ -0,0 +1,96 @@
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+using System.Text.Json.Serialization;
+using LibMatrix.Extensions;
+using LibMatrix.Responses;
+using Microsoft.Extensions.Logging;
+
+namespace LibMatrix.Services;
+
+public class HomeserverProviderService {
+    private readonly TieredStorageService _tieredStorageService;
+    private readonly ILogger<HomeserverProviderService> _logger;
+    private readonly HomeserverResolverService _homeserverResolverService;
+
+    public HomeserverProviderService(TieredStorageService tieredStorageService,
+        ILogger<HomeserverProviderService> logger, HomeserverResolverService homeserverResolverService) {
+        Console.WriteLine("Homeserver provider service instantiated!");
+        _tieredStorageService = tieredStorageService;
+        _logger = logger;
+        _homeserverResolverService = homeserverResolverService;
+        logger.LogDebug(
+            $"New HomeserverProviderService created with TieredStorageService<{string.Join(", ", tieredStorageService.GetType().GetProperties().Select(x => x.Name))}>!");
+    }
+
+    private static Dictionary<string, SemaphoreSlim> _authenticatedHomeserverSemaphore = new();
+    private static Dictionary<string, AuthenticatedHomeServer> _authenticatedHomeServerCache = new();
+
+    public async Task<AuthenticatedHomeServer> GetAuthenticatedWithToken(string homeserver, string accessToken,
+        string? overrideFullDomain = null) {
+        SemaphoreSlim sem = _authenticatedHomeserverSemaphore.GetOrCreate(homeserver+accessToken, _ => new SemaphoreSlim(1, 1));
+        await sem.WaitAsync();
+        if (_authenticatedHomeServerCache.ContainsKey(homeserver+accessToken)) {
+            sem.Release();
+            return _authenticatedHomeServerCache[homeserver+accessToken];
+        }
+
+        var hs = new AuthenticatedHomeServer(_tieredStorageService, homeserver, accessToken);
+        hs.FullHomeServerDomain = overrideFullDomain ??
+                                  await _homeserverResolverService.ResolveHomeserverFromWellKnown(homeserver);
+        hs._httpClient.Dispose();
+        hs._httpClient = new MatrixHttpClient { BaseAddress = new Uri(hs.FullHomeServerDomain) };
+        hs._httpClient.Timeout = TimeSpan.FromSeconds(120);
+        hs._httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
+
+        hs.WhoAmI = (await hs._httpClient.GetFromJsonAsync<WhoAmIResponse>("/_matrix/client/v3/account/whoami"))!;
+
+        _authenticatedHomeServerCache[homeserver+accessToken] = hs;
+        sem.Release();
+
+        return hs;
+    }
+
+    public async Task<RemoteHomeServer> GetRemoteHomeserver(string homeserver, string? overrideFullDomain = null) {
+        var hs = new RemoteHomeServer(homeserver);
+        hs.FullHomeServerDomain = overrideFullDomain ??
+                                  await _homeserverResolverService.ResolveHomeserverFromWellKnown(homeserver);
+        hs._httpClient.Dispose();
+        hs._httpClient = new MatrixHttpClient { BaseAddress = new Uri(hs.FullHomeServerDomain) };
+        hs._httpClient.Timeout = TimeSpan.FromSeconds(120);
+        return hs;
+    }
+
+    public async Task<LoginResponse> Login(string homeserver, string user, string password,
+        string? overrideFullDomain = null) {
+        var hs = await GetRemoteHomeserver(homeserver, overrideFullDomain);
+        var payload = new LoginRequest {
+            Identifier = new() { User = user },
+            Password = password
+        };
+        var resp = await hs._httpClient.PostAsJsonAsync("/_matrix/client/v3/login", payload);
+        var data = await resp.Content.ReadFromJsonAsync<LoginResponse>();
+        return data!;
+    }
+
+    private class LoginRequest {
+        [JsonPropertyName("type")]
+        public string Type { get; set; } = "m.login.password";
+
+        [JsonPropertyName("identifier")]
+        public LoginIdentifier Identifier { get; set; } = new();
+
+        [JsonPropertyName("password")]
+        public string Password { get; set; } = "";
+
+        [JsonPropertyName("initial_device_display_name")]
+        public string InitialDeviceDisplayName { get; set; } = "Rory&::LibMatrix";
+
+        public class LoginIdentifier {
+            [JsonPropertyName("type")]
+            public string Type { get; set; } = "m.id.user";
+
+            [JsonPropertyName("user")]
+            public string User { get; set; } = "";
+        }
+    }
+}