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using LibMatrix;
using LibMatrix.Services;
using MxApiExtensions.Services;
namespace ModAS.Server.Services;
public class AuthenticationService(ILogger<AuthenticationService> logger, ModASConfiguration config, IHttpContextAccessor request, HomeserverProviderService homeserverProviderService) {
private readonly HttpRequest _request = request.HttpContext!.Request;
private static Dictionary<string, string> _tokenMap = new();
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 (string.IsNullOrWhiteSpace(token) && fail) {
throw new MatrixException() {
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 (string.IsNullOrWhiteSpace(token)) {
if (fail) {
throw new MatrixException() {
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?>>();
logger.LogInformation("Looking up mxid for token {}", token);
var hs = await homeserverProviderService.GetAuthenticatedWithToken(config.ServerName, token, config.HomeserverUrl);
try {
var res = hs.WhoAmI.UserId;
logger.LogInformation("Got mxid {} for token {}", res, token);
await SaveMxidForToken(token, mxid);
return res;
}
catch (MatrixException 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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