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import { Server as SocketIOServer, Socket } from 'socket.io';
import { Server } from 'http';
import jwt from 'jsonwebtoken';
import { config } from '@/config';
import { User } from '@/models/User';
import { logger } from '@/utils/logger';
import { CacheService } from '@/services/CacheService';
interface AuthenticatedSocket extends Socket {
userId?: string;
user?: any;
}
export class SocketService {
private io: SocketIOServer;
private connectedUsers: Map<string, string> = new Map();
constructor(server: Server) {
this.io = new SocketIOServer(server, {
cors: {
origin: config.CLIENT_URL,
methods: ['GET', 'POST'],
credentials: true
},
pingTimeout: 60000,
pingInterval: 25000
});
this.initializeMiddleware();
this.initializeEventHandlers();
}
private initializeMiddleware(): void {
this.io.use(async (socket: AuthenticatedSocket, next) => {
try {
const token = socket.handshake.auth.token || socket.handshake.headers.authorization?.replace('Bearer ', '');
if (!token) {
return next(new Error('Authentication token required'));
}
const decoded = jwt.verify(token, config.JWT_SECRET) as any;
const user = await User.findById(decoded.userId);
if (!user || !user.isActive) {
return next(new Error('Invalid user'));
}
socket.userId = user._id.toString();
socket.user = user;
next();
} catch (error) {
next(new Error('Authentication failed'));
}
});
this.io.use(async (socket: AuthenticatedSocket, next) => {
const rateLimitKey = `socket_rate_limit:${socket.userId}`;
const currentCount = await CacheService.get(rateLimitKey) || 0;
if (currentCount > 100) {
return next(new Error('Rate limit exceeded'));
}
await CacheService.set(rateLimitKey, currentCount + 1, 60);
next();
});
}
private initializeEventHandlers(): void {
this.io.on('connection', (socket: AuthenticatedSocket) => {
this.handleConnection(socket);
});
}
private handleConnection(socket: AuthenticatedSocket): void {
const userId = socket.userId!;
logger.info(`Socket connected: ${socket.id} (User: ${userId})`);
this.connectedUsers.set(userId, socket.id);
socket.join(`user:${userId}`);
this.broadcastUserStatus(userId, 'online');
socket.on('join-room', (roomId: string) => {
this.handleJoinRoom(socket, roomId);
});
socket.on('leave-room', (roomId: string) => {
this.handleLeaveRoom(socket, roomId);
});
socket.on('private-message', (data) => {
this.handlePrivateMessage(socket, data);
});
socket.on('group-message', (data) => {
this.handleGroupMessage(socket, data);
});
socket.on('file-share', (data) => {
this.handleFileShare(socket, data);
});
socket.on('video-call-offer', (data) => {
this.handleVideoCallOffer(socket, data);
});
socket.on('video-call-answer', (data) => {
this.handleVideoCallAnswer(socket, data);
});
socket.on('video-call-ice-candidate', (data) => {
this.handleVideoCallIceCandidate(socket, data);
});
socket.on('disconnect', () => {
this.handleDisconnection(socket);
});
socket.on('error', (error) => {
logger.error(`Socket error for user ${userId}:`, error);
});
}
private handleJoinRoom(socket: AuthenticatedSocket, roomId: string): void {
socket.join(roomId);
socket.to(roomId).emit('user-joined', {
userId: socket.userId,
username: socket.user.username,
timestamp: new Date()
});
logger.info(`User ${socket.userId} joined room ${roomId}`);
}
private handleLeaveRoom(socket: AuthenticatedSocket, roomId: string): void {
socket.leave(roomId);
socket.to(roomId).emit('user-left', {
userId: socket.userId,
username: socket.user.username,
timestamp: new Date()
});
logger.info(`User ${socket.userId} left room ${roomId}`);
}
private async handlePrivateMessage(socket: AuthenticatedSocket, data: any): Promise<void> {
const { recipientId, message, type = 'text' } = data;
try {
const recipient = await User.findById(recipientId);
if (!recipient) {
socket.emit('error', { message: 'Recipient not found' });
return;
}
const messageData = {
id: this.generateMessageId(),
senderId: socket.userId,
senderName: socket.user.username,
recipientId,
message,
type,
timestamp: new Date(),
delivered: false,
read: false
};
await this.saveMessage(messageData);
const recipientSocketId = this.connectedUsers.get(recipientId);
if (recipientSocketId) {
this.io.to(recipientSocketId).emit('private-message', messageData);
messageData.delivered = true;
}
socket.emit('message-sent', messageData);
logger.info(`Private message sent from ${socket.userId} to ${recipientId}`);
} catch (error) {
logger.error('Error handling private message:', error);
socket.emit('error', { message: 'Failed to send message' });
}
}
private async handleGroupMessage(socket: AuthenticatedSocket, data: any): Promise<void> {
const { roomId, message, type = 'text' } = data;
try {
const messageData = {
id: this.generateMessageId(),
senderId: socket.userId,
senderName: socket.user.username,
roomId,
message,
type,
timestamp: new Date()
};
await this.saveGroupMessage(messageData);
socket.to(roomId).emit('group-message', messageData);
socket.emit('message-sent', messageData);
logger.info(`Group message sent by ${socket.userId} to room ${roomId}`);
} catch (error) {
logger.error('Error handling group message:', error);
socket.emit('error', { message: 'Failed to send message' });
}
}
private handleFileShare(socket: AuthenticatedSocket, data: any): void {
const { roomId, fileName, fileSize, fileType, fileUrl } = data;
const fileData = {
id: this.generateMessageId(),
senderId: socket.userId,
senderName: socket.user.username,
roomId,
fileName,
fileSize,
fileType,
fileUrl,
type: 'file',
timestamp: new Date()
};
if (roomId) {
socket.to(roomId).emit('file-shared', fileData);
}
socket.emit('file-share-confirmed', fileData);
logger.info(`File shared by ${socket.userId}: ${fileName}`);
}
private handleVideoCallOffer(socket: AuthenticatedSocket, data: any): void {
const { recipientId, offer } = data;
const recipientSocketId = this.connectedUsers.get(recipientId);
if (recipientSocketId) {
this.io.to(recipientSocketId).emit('video-call-offer', {
callerId: socket.userId,
callerName: socket.user.username,
offer
});
} else {
socket.emit('call-failed', { reason: 'User not available' });
}
}
private handleVideoCallAnswer(socket: AuthenticatedSocket, data: any): void {
const { callerId, answer } = data;
const callerSocketId = this.connectedUsers.get(callerId);
if (callerSocketId) {
this.io.to(callerSocketId).emit('video-call-answer', {
answerId: socket.userId,
answer
});
}
}
private handleVideoCallIceCandidate(socket: AuthenticatedSocket, data: any): void {
const { targetId, candidate } = data;
const targetSocketId = this.connectedUsers.get(targetId);
if (targetSocketId) {
this.io.to(targetSocketId).emit('video-call-ice-candidate', {
senderId: socket.userId,
candidate
});
}
}
private handleDisconnection(socket: AuthenticatedSocket): void {
const userId = socket.userId!;
logger.info(`Socket disconnected: ${socket.id} (User: ${userId})`);
this.connectedUsers.delete(userId);
this.broadcastUserStatus(userId, 'offline');
}
private broadcastUserStatus(userId: string, status: 'online' | 'offline'): void {
this.io.emit('user-status-change', {
userId,
status,
timestamp: new Date()
});
}
private generateMessageId(): string {
return `msg_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
}
private async saveMessage(messageData: any): Promise<void> {
}
private async saveGroupMessage(messageData: any): Promise<void> {
}
public sendToUser(userId: string, event: string, data: any): void {
const socketId = this.connectedUsers.get(userId);
if (socketId) {
this.io.to(socketId).emit(event, data);
}
}
public sendToRoom(roomId: string, event: string, data: any): void {
this.io.to(roomId).emit(event, data);
}
public broadcastToAll(event: string, data: any): void {
this.io.emit(event, data);
}
public getConnectedUsers(): string[] {
return Array.from(this.connectedUsers.keys());
}
public isUserConnected(userId: string): boolean {
return this.connectedUsers.has(userId);
}
}
|
