1 files changed, 53 insertions, 0 deletions
diff --git a/LibMatrix/Services/WellKnownResolvers/ClientWellKnownResolver.cs b/LibMatrix/Services/WellKnownResolvers/ClientWellKnownResolver.cs
new file mode 100644
index 0000000..d4d0166
--- /dev/null
+++ b/LibMatrix/Services/WellKnownResolvers/ClientWellKnownResolver.cs
@@ -0,0 +1,53 @@
+using System.Text.Json.Serialization;
+using ArcaneLibs.Collections;
+using LibMatrix.Extensions;
+using Microsoft.Extensions.Logging;
+
+namespace LibMatrix.Services.WellKnownResolvers;
+
+public class ClientWellKnownResolver(ILogger<ClientWellKnownResolver> logger) {
+    private static readonly SemaphoreCache<WellKnownResolutionResult> ClientWellKnownCache = new() {
+        StoreNulls = false
+    };
+    private static readonly MatrixHttpClient HttpClient = new();
+
+    public Task<WellKnownResolutionResult> TryResolveClientWellKnown(string homeserver) {
+        return ClientWellKnownCache.TryGetOrAdd(homeserver, async () => {
+            logger.LogTrace($"Resolving client well-known: {homeserver}");
+            if ((await TryGetClientWellKnownFromHttps(homeserver)) is { } clientWellKnown)
+                return new() {
+                    Source = WellKnownResolverService.WellKnownSource.Https,
+                    WellKnown = clientWellKnown
+                };
+
+            return default!;
+        });
+    }
+
+    private async Task<ClientWellKnown?> TryGetClientWellKnownFromHttps(string homeserver) {
+        try {
+            return await HttpClient.TryGetFromJsonAsync<ClientWellKnown>($"https://{homeserver}/.well-known/matrix/client");
+        }
+        catch {
+            return null;
+        }
+    }
+
+
+
+    public class ClientWellKnown {
+        [JsonPropertyName("m.homeserver")]
+        public required WellKnownHomeserver Homeserver { get; set; }
+
+        public class WellKnownHomeserver {
+            [JsonPropertyName("base_url")]
+            public required string BaseUrl { get; set; }
+        }
+    }
+    
+    public struct WellKnownResolutionResult {
+        public WellKnownResolverService.WellKnownSource Source { get; set; }
+        public ClientWellKnown WellKnown { get; set; }
+        public List<WellKnownResolverService.WellKnownResolutionWarning> Warnings { get; set; }
+    }
+}
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