Question

我创建了一个角度拦截器来检查我的身份验证令牌的有效性。不知何故，角度无法识别do方法。 subscribe有效，但我不想要这个解决方案，因为它将我的请求加倍发送到服务器。

TypeError: next.handle(...).do is not a function
at AuthTokenService.webpackJsonp.../../../../../src/app/commons/services/interceptors/auth-token.service.ts.AuthTokenService.intercept (auth-token.service.ts:37)
at HttpInterceptorHandler.webpackJsonp.../../../common/esm5/http.js.HttpInterceptorHandler.handle (http.js:1796)
at XsrfService.webpackJsonp.../../../../../src/app/commons/services/interceptors/xsrf.service.ts.XsrfService.intercept (xsrf.service.ts:15)
at HttpInterceptorHandler.webpackJsonp.../../../common/esm5/http.js.HttpInterceptorHandler.handle (http.js:1796)
at HttpXsrfInterceptor.webpackJsonp.../../../common/esm5/http.js.HttpXsrfInterceptor.intercept (http.js:2489)
at HttpInterceptorHandler.webpackJsonp.../../../common/esm5/http.js.HttpInterceptorHandler.handle (http.js:1796)
at MergeMapSubscriber.project (http.js:1466)
at MergeMapSubscriber.webpackJsonp.../../../../rxjs/_esm5/operators/mergeMap.js.MergeMapSubscriber._tryNext (mergeMap.js:128)
at MergeMapSubscriber.webpackJsonp.../../../../rxjs/_esm5/operators/mergeMap.js.MergeMapSubscriber._next (mergeMap.js:118)
at MergeMapSubscriber.webpackJsonp.../../../../rxjs/_esm5/Subscriber.js.Subscriber.next (Subscriber.js:92)

这是我的拦截器代码：

import { Injectable, NgModule} from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { HttpEvent, HttpInterceptor, HttpHandler, HttpRequest} from 
'@angular/common/http';
import { SessionService } from 'app/commons/services/auth/session.service';
import { HttpErrorResponse } from "@angular/common/http";
import { StateService } from '@uirouter/angular';

import 'rxjs/add/operator/do';

import * as _ from "lodash";

@Injectable()
export class AuthTokenService implements HttpInterceptor {
  constructor(
    private sessionService: SessionService,
    private stateService: StateService
  ) {}

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

    const currUser = this.sessionService.getCurrentUser();
    const authToken = _.get(currUser, ['auth_token'], null);

    let dupReq = req.clone({ headers: req.headers.set('Authorization', '') });

    if (!_.isNil(authToken)) {
      dupReq = req.clone({ headers: req.headers.set('Authorization', `Token ${authToken}`) });
    }

    return next.handle(dupReq)
      .do(ev => {
        console.log(event);
      })
  }
};

我认为我没有错过任何内容，但出于某种原因，它不会提到do副作用in the guide

Answer 1

在这里发现我的错误。在角度5中，运算符更改为lettable operators。我不太了解他们所做的事情然而，因为我是使用这种技术的新手。但在看了Angular 4文档和关于拦截器如何工作的答案几个小时的完全沮丧之后，我终于看到了这篇文章：Angular 5: Upgrading & Summary of New Features

我的更新代码：

import { map, filter, tap } from 'rxjs/operators';

@Injectable()
export class AuthTokenService implements HttpInterceptor {
    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {

        const started = Date.now();
        return next.handle(dupReq).pipe(
        tap(event => {
          if (event instanceof HttpResponse) {
            const elapsed = Date.now() - started;
            console.log(`Request for ${req.urlWithParams} took ${elapsed} ms.`);
          }
        }, error => {
          console.error('NICE ERROR', error)
        })
      )
    }
}

从我的http请求中捕获错误，如魅力。

Angular 5 Interceptor：TypeError：next.handle（...）。do不是函数

1 个答案: