fix(core): HTTP adapter error mapping

packages/core/router/routes-resolver.ts

@@ -1,4 +1,8 @@
-import { BadRequestException, NotFoundException } from '@nestjs/common';
+import {
+  BadRequestException,
+  HttpException,
+  NotFoundException,
+} from '@nestjs/common';
 import {
   HOST_METADATA,
   MODULE_PATH,
@@ -185,11 +189,24 @@ export class RoutesResolver implements Resolver {
       // encoding, e.g. '%FF' (#8915)
       case err instanceof SyntaxError || err instanceof URIError:
         return new BadRequestException(err.message);
+      case this.isHttpFastifyError(err):
+        return new HttpException(err.message, err.statusCode);
       default:
         return err;
     }
   }
 
+  private isHttpFastifyError(
+    error: any,
+  ): error is Error & { statusCode: number } {
+    // condition based on this code - https://github.com/fastify/fastify-error/blob/d669b150a82968322f9f7be992b2f6b463272de3/index.js#L22
+    return (
+      error.statusCode !== undefined &&
+      error instanceof Error &&
+      error.name === 'FastifyError'
+    );
+  }
+
   private getModulePathMetadata(metatype: Type<unknown>): string | undefined {
     const modulesContainer = this.container.getModules();
     const modulePath = Reflect.getMetadata(

packages/core/test/router/routes-resolver.spec.ts

@@ -1,5 +1,6 @@
 import {
   BadRequestException,
+  HttpException,
   Module,
   Post,
   VersioningType,
@@ -17,6 +18,7 @@ import { GraphInspector } from '../../inspector/graph-inspector';
 import { SerializedGraph } from '../../inspector/serialized-graph';
 import { RoutesResolver } from '../../router/routes-resolver';
 import { NoopHttpAdapter } from '../utils/noop-adapter.spec';
+import { createError as createFastifyError } from '@fastify/error';
 
 describe('RoutesResolver', () => {
   @Controller('global')
@@ -334,6 +336,35 @@ describe('RoutesResolver', () => {
           expect(outputErr).to.be.instanceof(BadRequestException);
         });
       });
+      describe('FastifyError', () => {
+        it('should map FastifyError with status code to HttpException', () => {
+          const FastifyErrorCls = createFastifyError(
+            'FST_ERR_CTP_INVALID_MEDIA_TYPE',
+            'Unsupported Media Type: %s',
+            415,
+          );
+          const error = new FastifyErrorCls();
+
+          const result = routesResolver.mapExternalException(error);
+
+          expect(result).to.be.instanceOf(HttpException);
+          expect(result.message).to.equal(error.message);
+          expect(result.getStatus()).to.equal(415);
+        });
+
+        it('should return FastifyError without user status code to Internal Server Error HttpException', () => {
+          const FastifyErrorCls = createFastifyError(
+            'FST_WITHOUT_STATUS_CODE',
+            'Error without status code',
+          );
+          const error = new FastifyErrorCls();
+
+          const result = routesResolver.mapExternalException(error);
+          expect(result).to.be.instanceOf(HttpException);
+          expect(result.message).to.equal(error.message);
+          expect(result.getStatus()).to.equal(500);
+        });
+      });
       describe('other', () => {
         it('should behave as an identity', () => {
           const err = new Error();