fix(express): Map missing multer error and map busboy errors

packages/platform-express/multer/multer/multer.constants.ts

@@ -1,9 +1,19 @@
 export const multerExceptions = {
+  // from https://github.com/expressjs/multer/blob/master/lib/multer-error.js
   LIMIT_PART_COUNT: 'Too many parts',
   LIMIT_FILE_SIZE: 'File too large',
   LIMIT_FILE_COUNT: 'Too many files',
   LIMIT_FIELD_KEY: 'Field name too long',
   LIMIT_FIELD_VALUE: 'Field value too long',
   LIMIT_FIELD_COUNT: 'Too many fields',
   LIMIT_UNEXPECTED_FILE: 'Unexpected field',
+  MISSING_FIELD_NAME: 'Field name missing',
+};
+
+export const busboyExceptions = {
+  // from https://github.com/mscdex/busboy/blob/master/lib/types/multipart.js
+  MULTIPART_BOUNDARY_NOT_FOUND: 'Multipart: Boundary not found',
+  MULTIPART_MALFORMED_PART_HEADER: 'Malformed part header',
+  MULTIPART_UNEXPECTED_END_OF_FORM: 'Unexpected end of form',
+  MULTIPART_UNEXPECTED_END_OF_FILE: 'Unexpected end of file',
 };

packages/platform-express/multer/multer/multer.utils.ts

@@ -3,7 +3,7 @@ import {
   HttpException,
   PayloadTooLargeException,
 } from '@nestjs/common';
-import { multerExceptions } from './multer.constants';
+import { multerExceptions, busboyExceptions } from './multer.constants';
 
 export function transformException(error: Error | undefined) {
   if (!error || error instanceof HttpException) {
@@ -18,7 +18,14 @@ export function transformException(error: Error | undefined) {
     case multerExceptions.LIMIT_FIELD_COUNT:
     case multerExceptions.LIMIT_UNEXPECTED_FILE:
     case multerExceptions.LIMIT_PART_COUNT:
+    case multerExceptions.MISSING_FIELD_NAME:
       return new BadRequestException(error.message);
+    case busboyExceptions.MULTIPART_BOUNDARY_NOT_FOUND:
+      return new BadRequestException(error.message);
+    case busboyExceptions.MULTIPART_MALFORMED_PART_HEADER:
+    case busboyExceptions.MULTIPART_UNEXPECTED_END_OF_FORM:
+    case busboyExceptions.MULTIPART_UNEXPECTED_END_OF_FILE:
+      return new BadRequestException(`Multipart: ${error.message}`);
   }
   return error;
 }

packages/platform-express/test/multer/multer/multer.utils.spec.ts

@@ -4,18 +4,21 @@ import {
   PayloadTooLargeException,
 } from '@nestjs/common';
 import { expect } from 'chai';
-import { multerExceptions } from '../../../multer/multer/multer.constants';
+import {
+  multerExceptions,
+  busboyExceptions,
+} from '../../../multer/multer/multer.constants';
 import { transformException } from '../../../multer/multer/multer.utils';
 
 describe('transformException', () => {
   describe('if error does not exist', () => {
-    it('behave as identity', () => {
+    it('should behave as identity', () => {
       const err = undefined;
       expect(transformException(err)).to.be.eq(err);
     });
   });
   describe('if error is instance of HttpException', () => {
-    it('behave as identity', () => {
+    it('should behave as identity', () => {
       const err = new HttpException('response', 500);
       expect(transformException(err)).to.be.eq(err);
     });
@@ -37,5 +40,22 @@ describe('transformException', () => {
         );
       });
     });
+    describe('and is busboy/multipart exception', () => {
+      it('should return "BadRequestException"', () => {
+        const err = { message: busboyExceptions.MULTIPART_BOUNDARY_NOT_FOUND };
+        expect(transformException(err as any)).to.be.instanceof(
+          BadRequestException,
+        );
+      });
+
+      it('should return "BadRequestException"', () => {
+        const err = {
+          message: busboyExceptions.MULTIPART_UNEXPECTED_END_OF_FORM,
+        };
+        expect(transformException(err as any)).to.be.instanceof(
+          BadRequestException,
+        );
+      });
+    });
   });
 });