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using System.Net.Http.Json;
using System.Text.Json;
using MatrixRoomUtils.Core.Extensions;
using Microsoft.Extensions.Logging;
namespace MatrixRoomUtils.Core.Services;
public class HomeserverResolverService {
private readonly HttpClient _httpClient;
private readonly ILogger<HomeserverResolverService> _logger;
public HomeserverResolverService(HttpClient httpClient, ILogger<HomeserverResolverService> logger) {
_httpClient = httpClient;
_logger = logger;
}
public async Task<string> ResolveHomeserverFromWellKnown(string homeserver) {
var res = await _resolveHomeserverFromWellKnown(homeserver);
if (!res.StartsWith("http")) res = "https://" + res;
if (res.EndsWith(":443")) res = res.Substring(0, res.Length - 4);
return res;
}
private async Task<string> _resolveHomeserverFromWellKnown(string homeserver) {
string? result = null;
_logger.LogInformation($"Attempting to resolve homeserver: {homeserver}");
if (!homeserver.StartsWith("http")) homeserver = "https://" + homeserver;
result ??= await _tryResolveFromClientWellknown(homeserver);
result ??= await _tryResolveFromServerWellknown(homeserver);
result ??= await _tryCheckIfDomainHasHomeserver(homeserver);
// if(!homeserver.Contains("http")) homeserver = "https://" + homeserver;
// result ??= await _tryCheckIfSubDomainHasHomeserver(homeserver, "matrix");
// result ??= await _tryCheckIfSubDomainHasHomeserver(homeserver, "chat");
if(result is not null) {
_logger.LogInformation($"Resolved homeserver: {homeserver} -> {result}");
return result;
}
throw new InvalidDataException($"Failed to resolve homeserver for {homeserver}! Is it online and configured correctly?");
}
private async Task<string?> _tryResolveFromClientWellknown(string homeserver) {
if (!homeserver.StartsWith("http")) homeserver = "https://" + homeserver;
if (await _httpClient.CheckSuccessStatus($"{homeserver}/.well-known/matrix/client")) {
var resp = await _httpClient.GetFromJsonAsync<JsonElement>($"{homeserver}/.well-known/matrix/client");
var hs = resp.GetProperty("m.homeserver").GetProperty("base_url").GetString();
return hs;
}
_logger.LogInformation("No client well-known...");
return null;
}
private async Task<string?> _tryResolveFromServerWellknown(string homeserver) {
if (!homeserver.StartsWith("http")) homeserver = "https://" + homeserver;
if (await _httpClient.CheckSuccessStatus($"{homeserver}/.well-known/matrix/server")) {
var resp = await _httpClient.GetFromJsonAsync<JsonElement>($"{homeserver}/.well-known/matrix/server");
var hs = resp.GetProperty("m.server").GetString();
return hs;
}
_logger.LogInformation("No server well-known...");
return null;
}
private async Task<string?> _tryCheckIfDomainHasHomeserver(string homeserver) {
_logger.LogInformation($"Checking if {homeserver} hosts a homeserver...");
if (await _httpClient.CheckSuccessStatus($"{homeserver}/_matrix/client/versions"))
return homeserver;
_logger.LogInformation("No homeserver on shortname...");
return null;
}
private async Task<string?> _tryCheckIfSubDomainHasHomeserver(string homeserver, string subdomain) {
homeserver = homeserver.Replace("https://", $"https://{subdomain}.");
return await _tryCheckIfDomainHasHomeserver(homeserver);
}
}
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