如何在Angular拦截器内向请求体添加内容？

Question

在这里我可以修改标题,因为有关于此功能的多个教程,但是:

@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);
    }
}

但在我的情况下,有一个令牌,我需要添加请求正文而不是请求标题,所以有任何方法来修改正文.

更新:Mild Fuzz的方法适用于简单的帖子请求,但我想添加查询,如果它是GET请求和正文,如果它允许添加正文.最重要的是,当我尝试发送表单数据时它就破了....request.body删除表单数据并将其转换为JSON对象,以便我的图像消失.

Answer 1

 req = req.clone({ 
  headers: req.headers.set('Accept', 'application/json'),
  body: {...req.body, hello: 'world' }});

这样的事情？

Answer 2

多亏了我想要的Mild Fuzz，但在我的情况下，我却遇到了一些并发症，并且可以解决一些额外的头痛问题。这是我的最终实现：

  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;    
  }
}

如果有人要检查，这里是编辑器链接。