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app/middleware/upload.middleware.js

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+/**
+ * Copyright (c) 2026 Niolla
+ * All rights reserved.
+ *
+ * This source code is proprietary and confidential.
+ * Unauthorized copying, modification, distribution, or use
+ * of this file, via any medium, is strictly prohibited.
+ */
+
+// app/middlewares/upload.middleware.js
+
+const multer = require("multer");
+
+// Use memory storage (required for S3 upload)
+const storage = multer.memoryStorage();
+
+// File filter (only images + PDFs)
+const fileFilter = (req, file, cb) => {
+    const allowedTypes = [
+    "image/",
+    "application/pdf",
+    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", // .xlsx
+    "application/vnd.ms-excel" // .xls
+  ];
+
+  const isValid =
+    file.mimetype.startsWith("image/") ||
+    file.mimetype === "application/pdf" ||
+    file.mimetype === "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" ||
+    file.mimetype === "application/vnd.ms-excel";
+
+  if (isValid) {
+    cb(null, true);
+  } else {
+    cb(new Error("Only images, PDFs, and Excel files are allowed"), false);
+  }
+};
+
+// Multer instance
+const upload = multer({
+  storage,
+  fileFilter,
+  limits: {
+    fileSize: 5 * 1024 * 1024, // max 5MB (global limit)
+  },
+});
+
+// Middleware wrappers
+
+// Single file upload
+const uploadSingle = (fieldName) => upload.single(fieldName);
+
+// Multiple files (same field)
+const uploadMultiple = (fieldName, maxCount = 5) =>
+  upload.array(fieldName, maxCount);
+
+// Multiple fields (advanced)
+const uploadFields = (fields) => upload.fields(fields);
+
+module.exports = {
+  uploadSingle,
+  uploadMultiple,
+  uploadFields,
+};