controllers/uploadController.js

@@ -66,17 +66,21 @@ async function finalizeUploadedImage(file, req, resizePreset) {
   }
 
   const { finalFileName, finalPath } = getFinalUploadTarget(file, req, true);
+  const finalPathMatchesInput = path.resolve(file.path) === path.resolve(finalPath);
 
-  await sharp(file.path)
+  const sourceBuffer = fs.readFileSync(file.path);
+  const optimizedBuffer = await sharp(sourceBuffer)
     .resize(preset.width, preset.height, {
       fit: 'contain',
       background: { r: 0, g: 0, b: 0, alpha: 0 },
       withoutEnlargement: true,
     })
     .webp({ quality: preset.quality })
-    .toFile(finalPath);
+    .toBuffer();
 
-  if (fs.existsSync(file.path)) {
+  fs.writeFileSync(finalPath, optimizedBuffer);
+
+  if (!finalPathMatchesInput && fs.existsSync(file.path)) {
     try {
       fs.unlinkSync(file.path);
     } catch (cleanupError) {

middleware/upload.js

@@ -34,6 +34,14 @@ const storage = multer.diskStorage({
 
       // Lấy tên file gốc (sanitize để tránh ký tự đặc biệt)
       const originalName = file.originalname.replace(/[^a-zA-Z0-9.-]/g, '_');
+      const resizePreset = req.query.resizePreset || '';
+      if (resizePreset) {
+        const parsedOriginalName = path.parse(originalName);
+        const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);
+        req.uploadFinalFileName = originalName;
+        return cb(null, `${parsedOriginalName.name}.__upload__${uniqueSuffix}${parsedOriginalName.ext}`);
+      }
+
       const fullPath = path.join(uploadPath, originalName);
 
       // Kiểm tra nếu file đã tồn tại