refractor code,

apps/api/src/http/upload/index.ts

@@ -0,0 +1,34 @@
+import multer from 'multer'
+import { ValidationError } from '../errors'
+
+const MAX_FILE_SIZE = 10 * 1024 * 1024 // 10 MB
+
+/**
+ * Shared multer instance used by all upload endpoints.
+ * Files are kept in memory so services receive a Buffer — no temp-file cleanup needed.
+ */
+export const imageUpload = multer({
+  storage: multer.memoryStorage(),
+  limits: { fileSize: MAX_FILE_SIZE },
+})
+
+/**
+ * Asserts that a file was provided and is an image MIME type.
+ * Call inside the route handler after the multer middleware runs.
+ */
+export function assertImageFile(
+  file: Express.Multer.File | undefined,
+  fieldLabel = 'file',
+): asserts file is Express.Multer.File {
+  if (!file) throw new ValidationError(`A ${fieldLabel} is required`)
+  if (!file.mimetype.startsWith('image/')) throw new ValidationError('Only image uploads are supported')
+}
+
+/**
+ * Asserts that at least one file was provided and all files are images.
+ */
+export function assertImageFiles(files: Express.Multer.File[], fieldLabel = 'photos'): void {
+  if (!files || files.length === 0) throw new ValidationError(`At least one ${fieldLabel} file is required`)
+  const nonImage = files.find((f) => !f.mimetype.startsWith('image/'))
+  if (nonImage) throw new ValidationError(`All uploaded files must be images — "${nonImage.originalname}" is not`)
+}