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using System.Collections.Concurrent;
using System.Text.Json;
using ArcaneLibs.Extensions;
using LibMatrix.Extensions;
using Microsoft.Extensions.Logging;
namespace LibMatrix.Services;
public class HomeserverResolverService(ILogger<HomeserverResolverService>? logger = null) {
private readonly MatrixHttpClient _httpClient = new() {
Timeout = TimeSpan.FromMilliseconds(10000)
};
private static readonly ConcurrentDictionary<string, WellKnownUris> WellKnownCache = new();
private static readonly ConcurrentDictionary<string, SemaphoreSlim> WellKnownSemaphores = new();
public async Task<WellKnownUris> ResolveHomeserverFromWellKnown(string homeserver) {
if (homeserver is null) throw new ArgumentNullException(nameof(homeserver));
WellKnownSemaphores.TryAdd(homeserver, new SemaphoreSlim(1, 1));
await WellKnownSemaphores[homeserver].WaitAsync();
if (WellKnownCache.TryGetValue(homeserver, out var known)) {
WellKnownSemaphores[homeserver].Release();
return known;
}
logger?.LogInformation("Resolving homeserver: {}", homeserver);
var res = new WellKnownUris {
Client = await _tryResolveFromClientWellknown(homeserver),
Server = await _tryResolveFromServerWellknown(homeserver)
};
WellKnownCache.TryAdd(homeserver, res);
WellKnownSemaphores[homeserver].Release();
return res;
}
private async Task<string?> _tryResolveFromClientWellknown(string homeserver) {
if (!homeserver.StartsWith("http")) homeserver = "https://" + homeserver;
try {
var resp = await _httpClient.GetFromJsonAsync<JsonElement>($"{homeserver}/.well-known/matrix/client");
var hs = resp.GetProperty("m.homeserver").GetProperty("base_url").GetString();
return hs;
}
catch {
// ignored
}
logger?.LogInformation("No client well-known...");
return null;
}
private async Task<string?> _tryResolveFromServerWellknown(string homeserver) {
if (!homeserver.StartsWith("http")) homeserver = "https://" + homeserver;
try {
var resp = await _httpClient.GetFromJsonAsync<JsonElement>($"{homeserver}/.well-known/matrix/server");
var hs = resp.GetProperty("m.server").GetString();
if (hs is null) throw new InvalidDataException("m.server is null");
if (!hs.StartsWithAnyOf("http://", "https://"))
hs = $"https://{hs}";
return hs;
}
catch {
// ignored
}
// fallback: most servers host these on the same location
var clientUrl = await _tryResolveFromClientWellknown(homeserver);
if (clientUrl is not null && await _httpClient.CheckSuccessStatus($"{clientUrl}/_matrix/federation/v1/version"))
return clientUrl;
logger?.LogInformation("No server well-known...");
return null;
}
public async Task<string?> ResolveMediaUri(string homeserver, string mxc) {
if (homeserver is null) throw new ArgumentNullException(nameof(homeserver));
if (mxc is null) throw new ArgumentNullException(nameof(mxc));
if (!mxc.StartsWith("mxc://")) throw new InvalidDataException("mxc must start with mxc://");
homeserver = (await ResolveHomeserverFromWellKnown(homeserver)).Client;
return mxc.Replace("mxc://", $"{homeserver}/_matrix/media/v3/download/");
}
public class WellKnownUris {
public string? Client { get; set; }
public string? Server { get; set; }
}
}
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