add bodysize

.env.example

@@ -1,6 +1,7 @@
 # Server Configuration
 SERVER_PORT=5001
 REACT_APP_API_BASE_URL=http://localhost:5001
+BODY_LIMIT=5mb
 # Client Configuration
 CLIENT_PORT=3001
 REACT_APP_CLIENT_URL=http://localhost:3001

server/.env.example

@@ -1,6 +1,7 @@
 # 服务器配置
 PORT=5001
 NODE_ENV=development
+BODY_LIMIT=5mb
 
 # 数据库配置
 MONGODB_URI=mongodb://localhost:27017/typeskill

server/server.ts

@@ -25,11 +25,13 @@ import sudokuRouter from './routes/sudoku';
 // 加载环境变量
 dotenv.config();
 
+const BODY_LIMIT = process.env.BODY_LIMIT || '5mb';
+
 const app = express();
 
 // 中间件配置
-app.use(express.json());
+app.use(express.json({ limit: BODY_LIMIT }));
-app.use(express.urlencoded({ extended: true }));
+app.use(express.urlencoded({ extended: true, limit: BODY_LIMIT }));
 app.use(cors());
 
 // 静态文件服务 - 优先处理 public 目录下的静态文件
@@ -202,7 +204,40 @@ app.use((req, res, next) => {
 
 // 错误处理中间件
 app.use((err: any, req: express.Request, res: express.Response, next: express.NextFunction) => {
-  console.error(err.stack);
+  if (res.headersSent) {
+    return next(err);
+  }
+
+  if (
+    err?.type === 'entity.too.large' ||
+    err?.name === 'PayloadTooLargeError' ||
+    err?.status === 413 ||
+    err?.statusCode === 413
+  ) {
+    console.warn('Request body too large:', {
+      method: req.method,
+      path: req.path,
+      limit: BODY_LIMIT
+    });
+    return res.status(413).json({
+      error: '请求体过大，请缩小单次提交内容',
+      code: 'PAYLOAD_TOO_LARGE'
+    });
+  }
+
+  if (err?.type === 'entity.parse.failed') {
+    console.error('Invalid JSON payload:', {
+      method: req.method,
+      path: req.path,
+      message: err?.message
+    });
+    return res.status(400).json({
+      error: '请求体格式无效',
+      code: 'INVALID_JSON'
+    });
+  }
+
+  console.error(err?.stack || err);
   res.status(500).send('Something broke!');
 });