NestJS:在Guards中接收表单数据吗? [英] NestJS: Receive form-data in Guards?

问题描述

我希望在NestJS Guards中查看表单数据.我已经按照该教程进行了操作，但是，我没有看到请求正文我的表单数据输入.但是，一旦在控制器中访问了一条路线，我便会看到尸体.

I'm looking to see form-data in my NestJS Guards. I've followed the tutorial, however, I'm not seeing the request body for my form-data input. I do see the body once I access a route within my controller, however.

以下是我正在使用的代码片段:

Here's some code snippets of what I'm working with:

module.ts


...

@Module({
  imports: [
    MulterModule.register({
      limits: { fileSize: MULTER_UPLOAD_FILESIZE_BYTES },
    }),
  ],
  controllers: [MainController],
  providers: [
    MainService,
    AuthGuard,
  ],
})
...

AuthGuard.ts


import { Injectable, CanActivate, ExecutionContext } from '@nestjs/common';
import { Observable } from 'rxjs';

@Injectable()
export class AuthGuard implements CanActivate {
  canActivate(
    context: ExecutionContext,
  ): boolean | Promise<boolean> | Observable<boolean> {
    const request = context.switchToHttp().getRequest(); // body is empty if form-data is used
    return true;
  }
}

MainController.ts


...

@Post("/upload")
@UseInterceptors(AnyFilesInterceptor())
@UseGuards(AuthGuard)
  async upload(
    @Body() body: UploadDTO,
    @UploadedFiles() files: any[]
  ): Promise<any> {
    console.log(body) // works as expected, whether form-data is used or not
    ...
  }
...

任何反馈将不胜感激！

推荐答案

NestJS防护始终在任何中间件之前执行.您可以在从上下文中获取的请求对象上手动使用multer.

NestJS guards are always executed before any middleware. You can use multer manually on the request object you get from the context.

import * as multer from 'multer'
...
async canActivate(context: ExecutionContext): Promise<boolean> {
  const request: Request = context.switchToHttp().getRequest();
  const postMulterRequest = await new Promise((resolve, reject) => {
    multer().any()(request, {}, function(err) {
      if (err) reject(err);
      resolve(request);
    });
  });
  // postMulterRequest has a completed body
  return true;
}

如果要使用@UploadedFiles装饰器，则需要克隆请求对象，然后才能在防护中对其进行修改.

If you want to use the @UploadedFiles decorator, you need to clone the request object before modifying it in your guard.

当然，您需要使用以下方法安装multer模块:

Of course you need to have installed the multer module with:

npm install multer

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