From 396ad181d00a5a46daa5637f862aa919e29f9b4e Mon Sep 17 00:00:00 2001
From: David Mehren <git@herrmehren.de>
Date: Fri, 11 Feb 2022 19:20:54 +0100
Subject: [PATCH] fix: correctly initialize exception mapping

The constructor of an exception filter must be given
an instance of HttpAdapterHost, otherwise it will crash at runtime.

This can be reproduced by GETing /.

Reference: https://docs.nestjs.com/exception-filters#inheritance
Signed-off-by: David Mehren <git@herrmehren.de>
---
 src/errors/error-mapping.ts | 2 ++
 src/main.ts                 | 5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/errors/error-mapping.ts b/src/errors/error-mapping.ts
index 59967bf54..c1f01e5d0 100644
--- a/src/errors/error-mapping.ts
+++ b/src/errors/error-mapping.ts
@@ -6,6 +6,7 @@
 import {
   ArgumentsHost,
   BadRequestException,
+  Catch,
   ConflictException,
   InternalServerErrorException,
   NotFoundException,
@@ -67,6 +68,7 @@ const mapOfHedgeDocErrorsToHttpErrors: Map<string, HttpExceptionConstructor> =
     ],
   ]);
 
+@Catch()
 export class ErrorExceptionMapping extends BaseExceptionFilter<Error> {
   catch(error: Error, host: ArgumentsHost): void {
     super.catch(ErrorExceptionMapping.transformError(error), host);
diff --git a/src/main.ts b/src/main.ts
index 597ab000c..f762174be 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -5,7 +5,7 @@
  */
 import { LogLevel } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
-import { NestFactory } from '@nestjs/core';
+import { HttpAdapterHost, NestFactory } from '@nestjs/core';
 import { NestExpressApplication } from '@nestjs/platform-express';
 
 import { AppModule } from './app.module';
@@ -79,7 +79,8 @@ async function bootstrap(): Promise<void> {
   app.useStaticAssets('public', {
     prefix: '/public/',
   });
-  app.useGlobalFilters(new ErrorExceptionMapping());
+  const { httpAdapter } = app.get(HttpAdapterHost);
+  app.useGlobalFilters(new ErrorExceptionMapping(httpAdapter));
   await app.listen(appConfig.port);
   logger.log(`Listening on port ${appConfig.port}`, 'AppBootstrap');
 }