如何在Angular拦截器中向请求主体添加一些内容? [英] How to add something to the body of request inside an Angular interceptor?

问题描述

在这里，我可以修改标题，因为存在有关此功能的多个教程，但是:

Here I'm able to modify the header as there are multiple tutorials present regarding this feature but:

@Injectable()
export class MyFirstInterceptor implements HttpInterceptor {

    constructor(private currentUserService: CurrentUserService) { }

    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        console.log(JSON.stringify(req));

        const token: string = this.currentUserService.token;

        if (token) {
            req = req.clone({ headers: req.headers.set('Authorization', 'Bearer ' + token) });
        }

        if (!req.headers.has('Content-Type')) {
            req = req.clone({ headers: req.headers.set('Content-Type', 'application/json') });
        }

        req = req.clone({ headers: req.headers.set('Accept', 'application/json') });
        return next.handle(req);
    }
}

但是在我的情况下，有一个令牌需要添加请求主体而不是请求标头，因此有任何方法可以修改主体.

But in my case there's a token which I need to add the request body instead of the request header so is there any method to modify the body.

更新:对于一个简单的帖子请求，Mild Fuzz的方法非常有效但我想添加查询，如果它是一个GET请求，如果它是正文允许添加一个身体.最重要的是，当我尝试发送表格数据. ... request.body 删除表单数据并将其转换为 JSON 对象，这样我的图像就消失了.

Update: Mild Fuzz's method is working great for a simple post request but I'll like to add to query if it's a GET request and body if it allows to add a body. And most importantly it broke when I tried to send a form data. ...request.body removes the form data and transforms it to a JSONobject so my image is gone.

推荐答案

这是我想要的温和模糊测试"，但在我的情况下，我遇到了一些复杂的问题，我可以用一些额外的头痛来解决.这是我的最终实现:

Thanks to Mild Fuzz that was what I wanted but in my case I had some complications which I was able to solve with some extra headache. Here's my final implementation:

  intercept(
    req: HttpRequest<any>, 
    next: HttpHandler
  ): Observable<HttpEvent<any>> {

    console.log('Intercepted!', req);
    const authService = this.injector.get(AuthService);
    const reqCloned =  this.handleBodyIn(req, localStorage.getItem('random_key'), 'random_key_added');
    const copiedReq = reqCloned;
    return next.handle(copiedReq);
  }
  handleBodyIn(req:HttpRequest<any>, tokenToAdd, tokenName) {
    if (req.method.toLowerCase() === 'post') {
      if (req.body instanceof FormData) {
        req =  req.clone({
          body: req.body.append(tokenName, tokenToAdd)
        })
      } else {
        const foo = {}; foo[tokenName] = tokenToAdd;
        req =  req.clone({
          body: {...req.body, ...foo}
        })
      }            
    } 
    if (req.method.toLowerCase() === 'get') {
      req = req.clone({
        params: req.params.set(tokenName, tokenName)
      });
    } 
    return req;    
  }
}

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