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using LibMatrix.Services;
using MxApiExtensions.Classes.LibMatrix;
namespace MxApiExtensions.Services;
public class AuthenticationService {
private readonly ILogger<AuthenticationService> _logger;
private readonly MxApiExtensionsConfiguration _config;
private readonly HomeserverProviderService _homeserverProviderService;
private readonly HttpRequest _request;
private static Dictionary<string, string> _tokenMap = new();
public AuthenticationService(ILogger<AuthenticationService> logger, MxApiExtensionsConfiguration config, IHttpContextAccessor request, HomeserverProviderService homeserverProviderService) {
_logger = logger;
_config = config;
_homeserverProviderService = homeserverProviderService;
_request = request.HttpContext!.Request;
}
internal string? GetToken(bool fail = true) {
string? token;
if (_request.Headers.TryGetValue("Authorization", out var tokens)) {
token = tokens.FirstOrDefault()?[7..];
}
else {
token = _request.Query["access_token"];
}
if (token == null && fail) {
throw new MxApiMatrixException {
ErrorCode = "M_MISSING_TOKEN",
Error = "Missing access token"
};
}
return token;
}
public async Task<string> GetMxidFromToken(string? token = null, bool fail = true) {
token ??= GetToken(fail);
if (token == null) {
if (fail) {
throw new MxApiMatrixException {
ErrorCode = "M_MISSING_TOKEN",
Error = "Missing access token"
};
}
return "@anonymous:*";
}
if(_tokenMap is not { Count: >0 } && File.Exists("token_map")) {
_tokenMap = (await File.ReadAllLinesAsync("token_map"))
.Select(l => l.Split('\t'))
.ToDictionary(l => l[0], l => l[1]);
}
if (_tokenMap.TryGetValue(token, out var mxid)) return mxid;
var lookupTasks = new Dictionary<string, Task<string?>>();
foreach (var homeserver in _config.AuthHomeservers) {
lookupTasks.Add(homeserver, GetMxidFromToken(token, homeserver));
await lookupTasks[homeserver].WaitAsync(TimeSpan.FromMilliseconds(250));
if(lookupTasks[homeserver].IsCompletedSuccessfully && !string.IsNullOrWhiteSpace(lookupTasks[homeserver].Result)) break;
}
await Task.WhenAll(lookupTasks.Values);
mxid = lookupTasks.Values.FirstOrDefault(x => x.Result != null)?.Result;
if(mxid is null) {
throw new MxApiMatrixException {
ErrorCode = "M_UNKNOWN_TOKEN",
Error = "Token not found on any configured homeservers: " + string.Join(", ", _config.AuthHomeservers)
};
}
// using var hc = new HttpClient();
// hc.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
// var resp = hc.GetAsync($"{_config.Homeserver}/_matrix/client/v3/account/whoami").Result;
// if (!resp.IsSuccessStatusCode) {
// throw new MatrixException {
// ErrorCode = "M_UNKNOWN",
// Error = "[Rory&::MxSyncCache] Whoami request failed"
// };
// }
//
// if (resp.Content is null) {
// throw new MatrixException {
// ErrorCode = "M_UNKNOWN",
// Error = "No content in response"
// };
// }
//
// var json = (await JsonDocument.ParseAsync(await resp.Content.ReadAsStreamAsync())).RootElement;
// var mxid = json.GetProperty("user_id").GetString()!;
_logger.LogInformation("Got mxid {} from token {}", mxid, token);
await SaveMxidForToken(token, mxid);
return mxid;
}
private async Task<string?> GetMxidFromToken(string token, string hsDomain) {
_logger.LogInformation("Looking up mxid for token {} on {}", token, hsDomain);
var hs = await _homeserverProviderService.GetAuthenticatedWithToken(hsDomain, token);
try {
var res = hs.WhoAmI.UserId;
_logger.LogInformation("Got mxid {} for token {} on {}", res, token, hsDomain);
return res;
}
catch (MxApiMatrixException e) {
if (e.ErrorCode == "M_UNKNOWN_TOKEN") {
return null;
}
throw;
}
}
public async Task SaveMxidForToken(string token, string mxid) {
_tokenMap.Add(token, mxid);
await File.AppendAllLinesAsync("token_map", new[] { $"{token}\t{mxid}" });
}
}
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