fix frontend port in cors configuration

apps/server/src/apps/board-collaboration.app.ts

@@ -30,7 +30,7 @@ async function bootstrap() {
 	await nestApp.init();
 
 	const port = 4450;
-	const basePath = '/api/v3';
+	const basePath = '/board-collaboration';
 
 	nestApp.setGlobalPrefix(basePath);
 	await nestApp.listen(port);

apps/server/src/modules/board/gateway/dto/board-collaboration-config.ts

@@ -0,0 +1,18 @@
+import { Configuration } from '@hpi-schul-cloud/commons/lib';
+
+const host = Configuration.get('HOST') as string;
+const isLocalhost = host.includes('localhost');
+const origin = isLocalhost ? 'http://localhost:4000' : host;
+
+export default class BoardCollaborationConfiguration {
+	static websocket = {
+		path: '/board-collaboration',
+		cors: {
+			origin,
+			methods: 'GET,HEAD,PUT,PATCH,POST,DELETE',
+			preflightContinue: false,
+			optionsSuccessStatus: 204,
+			credentials: true,
+		},
+	};
+}

apps/server/src/modules/board/gateway/socket.gateway.ts

@@ -1,4 +1,3 @@
-import { Configuration } from '@hpi-schul-cloud/commons/lib';
 import { MikroORM, UseRequestContext } from '@mikro-orm/core';
 import { UseGuards } from '@nestjs/common';
 import { SubscribeMessage, WebSocketGateway, WsException } from '@nestjs/websockets';
@@ -13,6 +12,7 @@ import {
 	MoveCardMessageParams,
 	UpdateColumnTitleMessageParams,
 } from './dto';
+import BoardCollaborationConfiguration from './dto/board-collaboration-config';
 import { CreateColumnMessageParams } from './dto/create-column.message.param';
 import { DeleteBoardMessageParams } from './dto/delete-board.message.param';
 import { FetchBoardMessageParams } from './dto/fetch-board.message.param';
@@ -21,17 +21,7 @@ import { UpdateBoardTitleMessageParams } from './dto/update-board-title.message.
 import { UpdateBoardVisibilityMessageParams } from './dto/update-board-visibility.message.param';
 import { Socket } from './types';
 
-@WebSocketGateway({
-	path: '/board-collaboration',
-	cors: {
-		origin: `${(Configuration.get('HOST') as string) ?? 'http://localhost'}`.replace(/:\d+$/, ':4000'),
-		methods: 'GET,HEAD,PUT,PATCH,POST,DELETE',
-		preflightContinue: false,
-		optionsSuccessStatus: 204,
-		credentials: true,
-		// transports: ['websocket'],
-	},
-})
+@WebSocketGateway(BoardCollaborationConfiguration.websocket)
 @UseGuards(WsJwtAuthGuard)
 export class SocketGateway {
 	// TODO: use loggables instead of legacy logger