websocket upload notification - closed #24 (#25)

* Render when a new asset is uploaded from WebSocket notification
* Update Readme

server/src/api-v1/communication/communication.gateway.ts

@@ -0,0 +1,47 @@
+import { OnGatewayConnection, OnGatewayDisconnect, WebSocketGateway, WebSocketServer } from '@nestjs/websockets';
+import { CommunicationService } from './communication.service';
+import { Socket, Server } from 'socket.io';
+import { ImmichJwtService } from '../../modules/immich-jwt/immich-jwt.service';
+import { Logger } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { UserEntity } from '../user/entities/user.entity';
+import { Repository } from 'typeorm';
+
+@WebSocketGateway()
+export class CommunicationGateway implements OnGatewayConnection, OnGatewayDisconnect {
+  constructor(
+    private immichJwtService: ImmichJwtService,
+
+    @InjectRepository(UserEntity)
+    private userRepository: Repository<UserEntity>,
+  ) {}
+
+  @WebSocketServer() server: Server;
+
+  handleDisconnect(client: Socket) {
+    client.leave(client.nsp.name);
+
+    Logger.log(`Client ${client.id} disconnected`);
+  }
+
+  async handleConnection(client: Socket, ...args: any[]) {
+    Logger.log(`New websocket connection: ${client.id}`, 'NewWebSocketConnection');
+    const accessToken = client.handshake.headers.authorization.split(' ')[1];
+    const res = await this.immichJwtService.validateToken(accessToken);
+
+    if (!res.status) {
+      client.emit('error', 'unauthorized');
+      client.disconnect();
+      return;
+    }
+
+    const user = await this.userRepository.findOne({ where: { id: res.userId } });
+    if (!user) {
+      client.emit('error', 'unauthorized');
+      client.disconnect();
+      return;
+    }
+
+    client.join(user.id);
+  }
+}