Angular HTTP Interceptor 如何链接一个 observable [英] Angular HTTP Interceptor how to chain an observable

问题描述

我正在使用 Azure AD adal 库进行身份验证.有一个调用来获取一个返回一个可观察的令牌.如何将这个 observable 添加到拦截中?在下面的例子中，如何让订阅中设置的请求作为 Observable 返回?

I am using the Azure AD adal library to do authentication. There is a call to aquire a token that returns an observable. How can this observable be added into the intercept? In the below example, how can I get the request that is set inside the subscribe to be returned as the Observable?

  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    this.authAzureService.getAccessToken()
    .subscribe(token => {
      // I need this to be returned
      request = this.getRequestWithHeaders(request, token);
    });

    // This returns the request before the access token is added
    return next.handle(request);
  }

推荐答案

感谢@Commecial Suicide 我找到了解决方案，那就是使用 flatMap.这是有效的代码:

Thanks to @Commecial Suicide I found the solution, which is to use a flatMap. Here is the code that worked:

  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    let requestHandler = this.authAzureService.getAccessToken()
    .flatMap(token => {
      request = this.getRequestWithHeaders(request, token);
      return next.handle(request);
    });
    return requestHandler;
  }

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