diff options
Diffstat (limited to '')
| -rw-r--r-- | LibMatrix/Services/HomeserverResolverService.cs | 169 |
1 files changed, 116 insertions, 53 deletions
diff --git a/LibMatrix/Services/HomeserverResolverService.cs b/LibMatrix/Services/HomeserverResolverService.cs index bcef541..42ad0a1 100644 --- a/LibMatrix/Services/HomeserverResolverService.cs +++ b/LibMatrix/Services/HomeserverResolverService.cs @@ -1,87 +1,135 @@ using System.Collections.Concurrent; +using System.Diagnostics; +using System.Net.Http.Json; using System.Text.Json; +using System.Text.Json.Nodes; +using System.Text.Json.Serialization; +using ArcaneLibs.Collections; using ArcaneLibs.Extensions; using LibMatrix.Extensions; using Microsoft.Extensions.Logging; +using Microsoft.Extensions.Logging.Abstractions; namespace LibMatrix.Services; -public class HomeserverResolverService(ILogger<HomeserverResolverService>? logger = null) { +public class HomeserverResolverService { 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(); + private static readonly SemaphoreCache<WellKnownUris> WellKnownCache = 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; + private readonly ILogger<HomeserverResolverService> _logger; + + public HomeserverResolverService(ILogger<HomeserverResolverService> logger) { + _logger = logger; + if (logger is NullLogger<HomeserverResolverService>) { + var stackFrame = new StackTrace(true).GetFrame(1); + Console.WriteLine( + $"WARN | Null logger provided to HomeserverResolverService!\n{stackFrame.GetMethod().DeclaringType} at {stackFrame.GetFileName()}:{stackFrame.GetFileLineNumber()}"); } + } + + private static SemaphoreSlim _wellKnownSemaphore = new(1, 1); + + public async Task<WellKnownUris> ResolveHomeserverFromWellKnown(string homeserver) { + ArgumentNullException.ThrowIfNull(homeserver); - logger?.LogInformation("Resolving homeserver: {}", homeserver); - var res = new WellKnownUris { - Client = await _tryResolveFromClientWellknown(homeserver), - Server = await _tryResolveFromServerWellknown(homeserver) - }; - WellKnownCache.TryAdd(homeserver, res); - WellKnownSemaphores[homeserver].Release(); - return res; + return await WellKnownCache.GetOrAdd(homeserver, async () => { + await _wellKnownSemaphore.WaitAsync(); + _logger.LogTrace($"Resolving homeserver well-knowns: {homeserver}"); + var client = _tryResolveClientEndpoint(homeserver); + + var res = new WellKnownUris(); + + // try { + res.Client = await client ?? throw new Exception("Could not resolve client URL."); + // } + // catch (Exception e) { + // _logger.LogError(e, "Error resolving client well-known for {hs}", homeserver); + // } + + var server = _tryResolveServerEndpoint(homeserver); + + // try { + res.Server = await server ?? throw new Exception("Could not resolve server URL."); + // } + // catch (Exception e) { + // _logger.LogError(e, "Error resolving server well-known for {hs}", homeserver); + // } + + _logger.LogInformation("Resolved well-knowns for {hs}: {json}", homeserver, res.ToJson(indent: false)); + _wellKnownSemaphore.Release(); + return res; + }); } - private async Task<string?> _tryResolveFromClientWellknown(string homeserver) { - if (!homeserver.StartsWith("http")) { - if (await _httpClient.CheckSuccessStatus($"https://{homeserver}/.well-known/matrix/client")) - homeserver = "https://" + homeserver; - else if (await _httpClient.CheckSuccessStatus($"http://{homeserver}/.well-known/matrix/client")) { - homeserver = "http://" + homeserver; - } + private async Task<string?> _tryResolveClientEndpoint(string homeserver) { + ArgumentNullException.ThrowIfNull(homeserver); + _logger.LogTrace("Resolving client well-known: {homeserver}", homeserver); + ClientWellKnown? clientWellKnown = null; + // check if homeserver has a client well-known + if (homeserver.StartsWith("https://")) { + clientWellKnown = await _httpClient.TryGetFromJsonAsync<ClientWellKnown>($"{homeserver}/.well-known/matrix/client"); } - - try { - var resp = await _httpClient.GetFromJsonAsync<JsonElement>($"{homeserver}/.well-known/matrix/client"); - var hs = resp.GetProperty("m.homeserver").GetProperty("base_url").GetString(); - return hs; + else if (homeserver.StartsWith("http://")) { + clientWellKnown = await _httpClient.TryGetFromJsonAsync<ClientWellKnown>($"{homeserver}/.well-known/matrix/client"); } - catch { - // ignored + else { + clientWellKnown ??= await _httpClient.TryGetFromJsonAsync<ClientWellKnown>($"https://{homeserver}/.well-known/matrix/client"); + clientWellKnown ??= await _httpClient.TryGetFromJsonAsync<ClientWellKnown>($"http://{homeserver}/.well-known/matrix/client"); + + if (clientWellKnown is null) { + if (await _httpClient.CheckSuccessStatus($"https://{homeserver}/_matrix/client/versions")) + return $"https://{homeserver}"; + if (await _httpClient.CheckSuccessStatus($"http://{homeserver}/_matrix/client/versions")) + return $"http://{homeserver}"; + } } - logger?.LogInformation("No client well-known..."); + if (!string.IsNullOrWhiteSpace(clientWellKnown?.Homeserver.BaseUrl)) + return clientWellKnown.Homeserver.BaseUrl; + + _logger.LogInformation("No client well-known..."); return null; } - private async Task<string?> _tryResolveFromServerWellknown(string homeserver) { - if (!homeserver.StartsWith("http")) { - if (await _httpClient.CheckSuccessStatus($"https://{homeserver}/.well-known/matrix/server")) - homeserver = "https://" + homeserver; - else if (await _httpClient.CheckSuccessStatus($"http://{homeserver}/.well-known/matrix/server")) { - homeserver = "http://" + homeserver; - } + private async Task<string?> _tryResolveServerEndpoint(string homeserver) { + // TODO: implement SRV delegation via DoH: https://developers.google.com/speed/public-dns/docs/doh/json + ArgumentNullException.ThrowIfNull(homeserver); + _logger.LogTrace($"Resolving server well-known: {homeserver}"); + ServerWellKnown? serverWellKnown = null; + // check if homeserver has a server well-known + if (homeserver.StartsWith("https://")) { + serverWellKnown = await _httpClient.TryGetFromJsonAsync<ServerWellKnown>($"{homeserver}/.well-known/matrix/server"); } - - try { - var resp = await _httpClient.GetFromJsonAsync<JsonElement>($"{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 = $"https://{hs}"; - return hs; + else if (homeserver.StartsWith("http://")) { + serverWellKnown = await _httpClient.TryGetFromJsonAsync<ServerWellKnown>($"{homeserver}/.well-known/matrix/server"); + } + else { + serverWellKnown ??= await _httpClient.TryGetFromJsonAsync<ServerWellKnown>($"https://{homeserver}/.well-known/matrix/server"); + serverWellKnown ??= await _httpClient.TryGetFromJsonAsync<ServerWellKnown>($"http://{homeserver}/.well-known/matrix/server"); } - catch { - // ignored + + _logger.LogInformation("Server well-known for {hs}: {json}", homeserver, serverWellKnown?.ToJson() ?? "null"); + + if (!string.IsNullOrWhiteSpace(serverWellKnown?.Homeserver)) { + var resolved = serverWellKnown.Homeserver; + if (resolved.StartsWith("https://") || resolved.StartsWith("http://")) + return resolved; + if (await _httpClient.CheckSuccessStatus($"https://{resolved}/_matrix/federation/v1/version")) + return $"https://{resolved}"; + if (await _httpClient.CheckSuccessStatus($"http://{resolved}/_matrix/federation/v1/version")) + return $"http://{resolved}"; + _logger.LogWarning("Server well-known points to invalid server: {resolved}", resolved); } - // fallback: most servers host these on the same location - var clientUrl = await _tryResolveFromClientWellknown(homeserver); + // fallback: most servers host C2S and S2S on the same domain + var clientUrl = await _tryResolveClientEndpoint(homeserver); if (clientUrl is not null && await _httpClient.CheckSuccessStatus($"{clientUrl}/_matrix/federation/v1/version")) return clientUrl; - logger?.LogInformation("No server well-known..."); + _logger.LogInformation("No server well-known..."); return null; } @@ -97,4 +145,19 @@ public class HomeserverResolverService(ILogger<HomeserverResolverService>? logge public string? Client { get; set; } public string? Server { get; set; } } + + public class ClientWellKnown { + [JsonPropertyName("m.homeserver")] + public WellKnownHomeserver Homeserver { get; set; } + + public class WellKnownHomeserver { + [JsonPropertyName("base_url")] + public string BaseUrl { get; set; } + } + } + + public class ServerWellKnown { + [JsonPropertyName("m.server")] + public string Homeserver { get; set; } + } } \ No newline at end of file |