Angular-7-拦截器-令牌刷新后重试请求

Question

我正在尝试为令牌过期时失败的请求实现拦截器。我尝试了多种方法但仍然没有成功。

我已经参考了下面的 URL 并阅读了多个博客。每个人都建议切换地图方法，但不与我合作。 Angular 4拦截器在令牌刷新后重试请求

我尝试将所有请求收集到cachedRequests中：Array> = []; 但不知道如何使用它来重新触发失败的请求。

成功刷新令牌后， this.next.handle(request) 不会被召回。不过我可以看到更新后的请求对象。

有人可以指出在角度7中用
“rxjs”：“〜6.3.3”，“rxjs-compat”：“^ 6.5.2”引用的地方，以实现拦截器。

下面是对我有用但仅获得令牌响应的代码

``````````
    handleError(request: HttpRequest<any>, next: HttpHandler, err) {
            if (err instanceof HttpErrorResponse) {
                if (err.status === 401) {
                    this.service.getNewToken().pipe(filter(token => token != null),
                        take(1),
                        switchMap((token: any) => {
                            console.log('token', token);
                            if (token && token.access_token && token.refresh_token) {
                                sessionStorage.setItem('accessToken', token.access_token);
                                sessionStorage.setItem('refreshToken', token.refresh_token);
                            }
                            request = this.addHeader(request);
                            request.headers.getAll('Authorization');
                            return next.handle(request);
                        })).subscribe(results => this.subject.next(results));

                }
            }
        }

`````````

更新2：尝试多种方法后我发现

1. 返回 next.handle(请求); <-- 这根本就没有被调用
2. 返回 next.handle(request).subscribe(); <-- 这被调用但不更新对请求的组件的响应。

感谢指点

Answer 1

回复晚了。我就是这样做的。

也适用于并行请求。

import { HttpInterceptor, HttpRequest, HttpHandler, HttpErrorResponse, HttpEvent, HttpResponse } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { environment } from 'src/environments/environment';
import { GlobalService } from './global.service';
import { tap, mergeMap, switchMap, filter, take, flatMap, catchError } from 'rxjs/operators';
import { Observable, Subject, throwError, of, BehaviorSubject } from 'rxjs';


@Injectable()
export class InterceptorService implements HttpInterceptor {
    private isRefreshing = false;
    private refreshTokenSubject: BehaviorSubject<any> = new BehaviorSubject<any>(null);
    constructor(public globalService: GlobalService) {
    }

    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        request = this.addHeader(request);
        // console.log('request ', request);
        return next.handle(request).pipe(catchError((error: any) => {
            if (error instanceof HttpErrorResponse) {
                if (error.status === 401) {
                    if (!this.isRefreshing) {
                        this.isRefreshing = true;
                        this.refreshTokenSubject.next(null);
                        request = this.addHeader(request);
                        console.log('Token request');
                        return this.globalService.getRefershToken().pipe(
                            switchMap((token: any) => {
                                console.log('inside token');
                                this.isRefreshing = false;

                                if (token && token.access_token && token.refresh_token) {
                                    sessionStorage.setItem('accessToken', token.access_token);
                                    sessionStorage.setItem('refreshToken', token.refresh_token);
                                }
                                // request = this.addHeader(request);
                                // console.log('request: ', request);
                                this.refreshTokenSubject.next(token);
                                return next.handle(this.addHeader(request));
                            }));

                    } else {
                        console.log('inside else call');
                        console.log('token : ', this.refreshTokenSubject.getValue());
                        return this.refreshTokenSubject.pipe(
                            filter(token => (token != null && token != undefined)),
                            take(1),
                            switchMap(() => {
                                console.log('adding header in else');
                                return next.handle(this.addHeader(request))

                            }));
                    }
                }
            }
        }));
    }

    private addHeader(request: HttpRequest<any>) {
        let getEndPoint = request.url.split('/')[request.url.split('/').length - 1];
        if (getEndPoint !== 'refreshToken') {
            const accessToken = sessionStorage.getItem('accessToken');
            request = request.clone({
                setHeaders: {
                    Authorization: `Bearer ${accessToken}`
                }
            });
        } else if (getEndPoint === 'refreshToken') {
            const refreshToken = sessionStorage.getItem('refreshToken');
            request = request.clone({
                setHeaders: {
                    applicationCode: environment.applicationCode,
                    'refresh-token': `${refreshToken}`,
                }
            });
        }
        return request;
    }
}