new features

backend/src/middleware/upload.ts

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+/* eslint-disable @typescript-eslint/no-explicit-any */
+import multer from 'multer';
+import path from 'path';
+import fs from 'fs';
+import logger from '../utils/logger';
+
+const UPLOAD_DIR = path.resolve(__dirname, '../../../uploads/bestellungen');
+const THUMBNAIL_DIR = path.resolve(__dirname, '../../../uploads/bestellungen/thumbnails');
+
+// Ensure directories exist
+[UPLOAD_DIR, THUMBNAIL_DIR].forEach(dir => {
+  if (!fs.existsSync(dir)) {
+    fs.mkdirSync(dir, { recursive: true });
+    logger.info(`Created upload directory: ${dir}`);
+  }
+});
+
+const storage = multer.diskStorage({
+  destination(_req: any, _file: any, cb: any) {
+    cb(null, UPLOAD_DIR);
+  },
+  filename(_req: any, file: any, cb: any) {
+    const uniqueSuffix = `${Date.now()}-${Math.round(Math.random() * 1e9)}`;
+    const ext = path.extname(file.originalname);
+    cb(null, `${uniqueSuffix}${ext}`);
+  },
+});
+
+const ALLOWED_TYPES = [
+  'image/jpeg', 'image/png', 'image/gif', 'image/webp',
+  'application/pdf',
+  'application/msword', 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+  'application/vnd.ms-excel', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+  'text/plain', 'text/csv',
+];
+
+const multerOptions: any = {
+  storage,
+  fileFilter(_req: any, file: any, cb: any) {
+    if (ALLOWED_TYPES.includes(file.mimetype)) {
+      cb(null, true);
+    } else {
+      cb(new Error(`Dateityp ${file.mimetype} ist nicht erlaubt.`));
+    }
+  },
+  limits: { fileSize: 20 * 1024 * 1024 }, // 20 MB
+};
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export const uploadBestellung: any = multer(multerOptions);
+
+export { UPLOAD_DIR, THUMBNAIL_DIR };