Fix UTF-8 file name uploads

https://github.com/expressjs/multer/issues/1104

server.js

@@ -286,6 +286,7 @@ app.use(userModule.requireLoginMiddleware);
 
 // File uploads
 app.use(multer({ dest: UPLOADS_PATH, limits: { fieldSize: 10 * 1024 * 1024 } }).single('avatar'));
+app.use(require('./src/middleware/multerMonkeyPatch'));
 
 // User data mount
 app.use('/', userModule.router);

src/middleware/multerMonkeyPatch.js

@@ -0,0 +1,30 @@
+/**
+ * Decodes a file name from Latin1 to UTF-8.
+ * @param {string} str Input string
+ * @returns {string} Decoded file name
+ */
+function decodeFileName(str) {
+    return Buffer.from(str, 'latin1').toString('utf-8');
+}
+
+/**
+ * Middleware to decode file names from Latin1 to UTF-8.
+ * See: https://github.com/expressjs/multer/issues/1104
+ * @param {import('express').Request} req Request
+ * @param {import('express').Response} _res Response
+ * @param {import('express').NextFunction} next Next middleware
+ */
+function multerMonkeyPatch(req, _res, next) {
+    try{
+        if (req.file) {
+            req.file.originalname = decodeFileName(req.file.originalname);
+        }
+
+        next();
+    } catch (error) {
+        console.error('Error in multerMonkeyPatch:', error);
+        next();
+    }
+}
+
+module.exports = multerMonkeyPatch;