Simplify baseUrl implementation using URL rewrite

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

back/config/index.ts

@@ -64,6 +64,19 @@ if (!process.env.QL_DIR) {
 
 const lastVersionFile = `https://qn.whyour.cn/version.yaml`;
 
+// Get and normalize QlBaseUrl
+let baseUrl = process.env.QlBaseUrl || '';
+if (baseUrl) {
+  // Ensure it starts with /
+  if (!baseUrl.startsWith('/')) {
+    baseUrl = `/${baseUrl}`;
+  }
+  // Remove trailing slash for consistency in route definitions
+  if (baseUrl.endsWith('/')) {
+    baseUrl = baseUrl.slice(0, -1);
+  }
+}
+
 const rootPath = process.env.QL_DIR as string;
 const envFound = dotenv.config({ path: path.join(rootPath, '.env') });
 
@@ -116,6 +129,7 @@ if (envFound.error) {
 export default {
   ...config,
   jwt: config.jwt,
+  baseUrl,
   rootPath,
   tmpPath,
   dataPath,

back/loaders/express.ts

@@ -15,6 +15,13 @@ import path from 'path';
 export default ({ app }: { app: Application }) => {
   app.set('trust proxy', 'loopback');
   app.use(cors());
+  
+  // Rewrite URLs to strip baseUrl prefix if configured
+  // This allows the rest of the app to work without baseUrl awareness
+  if (config.baseUrl) {
+    app.use(rewrite(`${config.baseUrl}/*`, '/$1'));
+  }
+  
   app.get(`${config.api.prefix}/env.js`, serveEnv);
   app.use(`${config.api.prefix}/static`, express.static(config.uploadPath));