Refactor API configuration and improve WebSocket handling in frontend and backend

frontend/src/api/client.ts

@@ -1,4 +1,4 @@
-const API_BASE_URL = import.meta.env.VITE_API_URL || "https://docnest-backend-mingda.fly.dev/api";
+import { API_BASE_URL } from '../config';
 
 export async function authFetch(url: string, options?: RequestInit): Promise<Response> {
   const token = localStorage.getItem('auth_token');

frontend/src/config/index.ts

@@ -0,0 +1,24 @@
+interface Config {
+  apiUrl: string;
+  wsUrl: string;
+  environment: 'development' | 'production';
+}
+
+function loadConfig(): Config {
+  const apiUrl = import.meta.env.VITE_API_URL || 'http://localhost:8080/api';
+  const wsUrl = import.meta.env.VITE_WS_URL || 'ws://localhost:8080/ws';
+  const environment = import.meta.env.MODE === 'production' ? 'production' : 'development';
+
+  return {
+    apiUrl,
+    wsUrl,
+    environment,
+  };
+}
+
+export const config = loadConfig();
+
+// Convenience exports
+export const API_BASE_URL = config.apiUrl;
+export const WS_URL = config.wsUrl;
+export const isProduction = config.environment === 'production';

frontend/src/hooks/useYjsDocument.ts

@@ -47,6 +47,13 @@ export const useYjsDocument = (documentId: string, shareToken?: string) => {
     let currentProviders: YjsProviders | null = null;
 
     const initializeDocument = async () => {
+      // Read port override from query param for testing multiple backends
+      const searchParams = new URLSearchParams(window.location.search);
+      const portOverride = searchParams.get('port');
+      const wsUrlOverride = portOverride
+        ? `ws://localhost:${portOverride}/ws`
+        : undefined;
+
       // For share token access, use placeholder user info
       // Extract user data (handle both direct user object and nested structure for backwards compat)
       const realUser = user || {
@@ -69,12 +76,16 @@ export const useYjsDocument = (documentId: string, shareToken?: string) => {
       });
       const authToken = token || "";
       console.log("authToken is " + token);
+      if (wsUrlOverride) {
+        console.log(`🔧 Using WebSocket URL override: ${wsUrlOverride}`);
+      }
 
       const yjsProviders = await createYjsDocument(
         documentId,
         { id: currentId, name: currentName, avatar_url: currentAvatar },
         authToken,
-        shareToken
+        shareToken,
+        wsUrlOverride
       );
       currentProviders = yjsProviders;
 

frontend/src/lib/yjs.ts

@@ -3,8 +3,7 @@ import { Awareness } from "y-protocols/awareness";
 import { WebsocketProvider } from "y-websocket";
 import * as Y from "yjs";
 import { documentsApi } from "../api/document";
-
-const WS_URL = import.meta.env.VITE_WS_URL || "wss://docnest-backend-mingda.fly.dev/ws";
+import { WS_URL } from "../config";
 
 export interface YjsProviders {
   ydoc: Y.Doc;
@@ -23,7 +22,8 @@ export const createYjsDocument = async (
   documentId: string,
   _user: YjsUser,
   token: string,
-  shareToken?: string
+  shareToken?: string,
+  wsUrlOverride?: string
 ): Promise<YjsProviders> => {
   // Create Yjs document
   const ydoc = new Y.Doc();
@@ -46,8 +46,9 @@ export const createYjsDocument = async (
   const wsParams: { [key: string]: string } = shareToken
     ? { share: shareToken }
     : { token: token };
+  const wsUrl = wsUrlOverride || WS_URL;
   const websocketProvider = new WebsocketProvider(
-    WS_URL,
+    wsUrl,
     documentId,
     ydoc,
     { params: wsParams }

frontend/src/pages/LandingPage.tsx

@@ -1,9 +1,8 @@
 import FloatingGem from '../components/PixelSprites/FloatingGem';
 import PixelIcon from '../components/PixelIcon/PixelIcon';
+import { API_BASE_URL } from '../config';
 import './LandingPage.css';
 
-const API_BASE_URL = import.meta.env.VITE_API_URL || "https://docnest-backend-mingda.fly.dev/api";
-
 function LandingPage() {
   const handleGoogleLogin = () => {
     window.location.href = `${API_BASE_URL}/auth/google`;

frontend/src/pages/LoginPage.tsx

@@ -1,10 +1,9 @@
 import { useEffect } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { useAuth } from '../contexts/AuthContext';
+import { API_BASE_URL } from '../config';
 import './LoginPage.css';
 
-const API_BASE_URL = import.meta.env.VITE_API_URL || "https://docnest-backend-mingda.fly.dev/api";
-
 function LoginPage() {
   const { user, loading } = useAuth();
   const navigate = useNavigate();