Add core models, DTOs, and services for EchoHub chat application

- Created User, Channel, Message, and ServerInfo models with necessary properties. - Added DTOs for user profiles, server information, and message handling. - Implemented JWT authentication service for user login and token generation. - Developed Entity Framework Core DbContext for database interactions. - Introduced SignalR ChatHub for real-time messaging and presence tracking. - Implemented file storage and image to ASCII conversion services. - Set up CORS and middleware for API endpoints. - Created launch settings and development configuration for server and web projects.
2026-09-06 23:34:13 +02:00 · 2026-02-18 13:52:19 +01:00
parent 20a341947a
commit cfa8b90d04
47 changed files with 4596 additions and 0 deletions
@@ -0,0 +1,113 @@
+using System.Collections.Concurrent;
+
+namespace EchoHub.Server.Services;
+
+public class PresenceTracker
+{
+    private readonly ConcurrentDictionary<string, (Guid userId, string username)> _connections = new();
+    private readonly ConcurrentDictionary<string, HashSet<string>> _userConnections = new();
+    private readonly ConcurrentDictionary<string, HashSet<string>> _userChannels = new();
+
+    private readonly object _lock = new();
+
+    public void UserConnected(string connectionId, Guid userId, string username)
+    {
+        _connections[connectionId] = (userId, username);
+
+        lock (_lock)
+        {
+            if (!_userConnections.TryGetValue(username, out var connections))
+            {
+                connections = new HashSet<string>();
+                _userConnections[username] = connections;
+            }
+
+            connections.Add(connectionId);
+        }
+    }
+
+    public string? UserDisconnected(string connectionId)
+    {
+        if (!_connections.TryRemove(connectionId, out var userInfo))
+            return null;
+
+        var username = userInfo.username;
+
+        lock (_lock)
+        {
+            if (_userConnections.TryGetValue(username, out var connections))
+            {
+                connections.Remove(connectionId);
+
+                if (connections.Count == 0)
+                {
+                    _userConnections.TryRemove(username, out _);
+                    _userChannels.TryRemove(username, out _);
+                }
+            }
+        }
+
+        return username;
+    }
+
+    public void JoinChannel(string username, string channelName)
+    {
+        lock (_lock)
+        {
+            if (!_userChannels.TryGetValue(username, out var channels))
+            {
+                channels = new HashSet<string>();
+                _userChannels[username] = channels;
+            }
+
+            channels.Add(channelName);
+        }
+    }
+
+    public void LeaveChannel(string username, string channelName)
+    {
+        lock (_lock)
+        {
+            if (_userChannels.TryGetValue(username, out var channels))
+            {
+                channels.Remove(channelName);
+            }
+        }
+    }
+
+    public List<string> GetOnlineUsersInChannel(string channelName)
+    {
+        var users = new List<string>();
+
+        lock (_lock)
+        {
+            foreach (var (username, channels) in _userChannels)
+            {
+                if (channels.Contains(channelName))
+                {
+                    users.Add(username);
+                }
+            }
+        }
+
+        return users;
+    }
+
+    public List<string> GetChannelsForUser(string username)
+    {
+        lock (_lock)
+        {
+            if (_userChannels.TryGetValue(username, out var channels))
+            {
+                return channels.ToList();
+            }
+        }
+
+        return [];
+    }
+
+    public bool IsOnline(string username)
+    {
+        return _userConnections.TryGetValue(username, out var connections) && connections.Count > 0;
+    }
+}