Angular4.3中的HttpInterceptor：在jwt刷新后在拦截器中重新发送请求

解决了

与有用的帖子/sf/ask/17360801/

import { Observable } from 'rxjs';
import { Injectable, Inject, Injector } from '@angular/core';
import { HttpEvent, HttpInterceptor, HttpHandler, HttpRequest, HttpResponse, HttpErrorResponse } from '@angular/common/http';
import { UserService } from "./user/services/user.service";

@Injectable()
export class AngularInterceptor implements HttpInterceptor {
    public userService;

    constructor(private injector: Injector) {
    }

    private applyCredentials = function (req) {
        return req.clone({
            headers: req.headers.set('Authorization', 'Bearer ' + localStorage.getItem('data-app'))
        });
    };

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

        this.userService = this.injector.get(UserService);

        return next.handle(this.applyCredentials(req))
        /*.do(event => {

            if (event instanceof HttpResponse) {
                console.log(event);
            }
        })*/
            .catch((res) => {
                console.log('Token refresh');

                if (res.status === 401 || res.status === 403) {
                    return this.userService.refreshToken().first().flatMap((data: any) => {
                        if (data.token !== '') {
                            localStorage.removeItem('data-app');
                            localStorage.setItem('data-app', data.token);

                            this.userService.token = localStorage.getItem('data-app');
                        } else {
                            this.userService.logOut();

                            return Observable.throw(res);
                        }

                        return next.handle(this.applyCredentials(req));
                    });
                } else if (res.status === 500) {
                    this.userService.logOut();
                }

                return Observable.throw(res);
            });
    }
}