89 lines
3.0 KiB
C#
89 lines
3.0 KiB
C#
using System.Collections.Concurrent;
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using Microsoft.Extensions.Hosting;
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using Microsoft.Extensions.Logging;
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namespace MareSynchronosAuthService.Services;
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public class DiscoveryPresenceService : IHostedService
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{
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private readonly ILogger<DiscoveryPresenceService> _logger;
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// hash -> (uid, expiresAt, displayName?)
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private readonly ConcurrentDictionary<string, (string Uid, DateTimeOffset ExpiresAt, string? DisplayName)> _presence = new(StringComparer.Ordinal);
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// token -> (targetUid, expiresAt)
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private readonly ConcurrentDictionary<string, (string TargetUid, DateTimeOffset ExpiresAt)> _tokens = new(StringComparer.Ordinal);
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private Timer? _cleanupTimer;
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private readonly TimeSpan _presenceTtl = TimeSpan.FromMinutes(5);
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private readonly TimeSpan _tokenTtl = TimeSpan.FromMinutes(2);
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public DiscoveryPresenceService(ILogger<DiscoveryPresenceService> logger)
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{
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_logger = logger;
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}
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public Task StartAsync(CancellationToken cancellationToken)
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{
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_cleanupTimer = new Timer(_ => Cleanup(), null, TimeSpan.FromMinutes(1), TimeSpan.FromMinutes(1));
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return Task.CompletedTask;
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}
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public Task StopAsync(CancellationToken cancellationToken)
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{
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_cleanupTimer?.Dispose();
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return Task.CompletedTask;
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}
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private void Cleanup()
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{
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var now = DateTimeOffset.UtcNow;
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foreach (var kv in _presence.ToArray())
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{
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if (kv.Value.ExpiresAt <= now) _presence.TryRemove(kv.Key, out _);
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}
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foreach (var kv in _tokens.ToArray())
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{
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if (kv.Value.ExpiresAt <= now) _tokens.TryRemove(kv.Key, out _);
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}
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}
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public void Publish(string uid, IEnumerable<string> hashes, string? displayName = null)
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{
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var exp = DateTimeOffset.UtcNow.Add(_presenceTtl);
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foreach (var h in hashes.Distinct(StringComparer.Ordinal))
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{
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_presence[h] = (uid, exp, displayName);
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}
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_logger.LogDebug("Discovery presence published for {uid} with {n} hashes", uid, hashes.Count());
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}
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public (bool Found, string Token, string? DisplayName) TryMatchAndIssueToken(string requesterUid, string hash)
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{
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if (_presence.TryGetValue(hash, out var entry))
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{
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if (string.Equals(entry.Uid, requesterUid, StringComparison.Ordinal)) return (false, string.Empty, null);
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var token = Guid.NewGuid().ToString("N");
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_tokens[token] = (entry.Uid, DateTimeOffset.UtcNow.Add(_tokenTtl));
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return (true, token, entry.DisplayName);
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}
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return (false, string.Empty, null);
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}
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public bool ValidateToken(string token, out string targetUid)
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{
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targetUid = string.Empty;
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if (_tokens.TryGetValue(token, out var info))
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{
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if (info.ExpiresAt > DateTimeOffset.UtcNow)
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{
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targetUid = info.TargetUid;
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return true;
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}
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_tokens.TryRemove(token, out _);
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}
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return false;
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}
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}
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