feat: setup the attachment to the passenger api

apps/edr-passenger-api/src/modules/support/attachment-upload.options.ts

@@ -0,0 +1,20 @@
+import { SUPPORT_ATTACHMENT_MAX_BYTES, SUPPORT_ATTACHMENT_MAX_PER_MESSAGE } from '@edr/types';
+import { MulterOptions } from '@nestjs/platform-express/multer/interfaces/multer-options.interface';
+
+/** Multipart field name carrying chat files. */
+export const SUPPORT_ATTACHMENT_FIELD = 'attachments';
+
+/**
+ * Multer-level caps for the chat send routes.
+ *
+ * These duplicate `SupportService.assertSendable` on purpose and don't replace
+ * it: Multer stops reading the socket once a part exceeds `fileSize`, so an
+ * oversized upload is cut off mid-stream rather than buffered into memory and
+ * rejected afterwards. The service check produces the readable error.
+ */
+export const supportAttachmentMulterOptions: MulterOptions = {
+  limits: {
+    fileSize: SUPPORT_ATTACHMENT_MAX_BYTES,
+    files: SUPPORT_ATTACHMENT_MAX_PER_MESSAGE,
+  },
+};