Question

我正在使用Azure AD adal库进行身份验证。有一个调用获取一个返回一个observable的令牌。如何将这种可观察性添加到拦截中？在下面的示例中，如何将订阅中设置的请求作为Observable返回？

  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);
  }

Answer 1

感谢@Commecial Suicide，我找到了解决方案，即使用flatMap。以下是有效的代码：

  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;
  }

Answer 2

如果您需要从Observable返回某些内容，则可以使用map代替subscribe：

return this.authAzureService.getAccessToken()
  .map(token => request = this.getRequestWithHeaders(request, token));
}

Answer 3

request = request.clone({
  setHeaders: {
    Authorization: `Bearer ${token}`
  }
});
return next.handle(request);

Angular HTTP Interceptor如何链接一个observable

3 个答案: