How to handle unauthorized requests(status with 401 or 403) with new httpClient in angular 4.3

Question

I have an auth-interceptor.service.ts to handle the requests

import {Injectable} from \'@angular/core\';
import {HttpErrorResponse, HttpEvent, Ht         


        

Answer 1

From the @bryan60 suggestion I made few changes to his solution

In app.module.ts:

providers: [
     {
        provide: HTTP_INTERCEPTORS,
        useFactory: function(injector: Injector) {
            return new AuthInterceptor(injector);
        },
        multi: true,
        deps: [Injector]
    },
      .... other providers ...
]

and in auth-interceptor.service.ts:

import {Injectable, Injector} from '@angular/core';
import {HttpErrorResponse, HttpEvent, HttpHandler, HttpInterceptor, HttpRequest} from '@angular/common/http';
import {Observable} from 'rxjs/Observable';
import {Cookie} from './cookie.service';
import {Router} from '@angular/router';
import {UserService} from './user.service';
import {ToasterService} from '../toaster/toaster.service';
import 'rxjs/add/operator/catch';
import 'rxjs/add/observable/throw';

@Injectable()
export class AuthInterceptor implements HttpInterceptor {
    constructor(private injector: Injector) {}

    private handleError(err: HttpErrorResponse): Observable {
        let errorMsg;
        if (err.error instanceof Error) {
            // A client-side or network error occurred. Handle it accordingly.
            errorMsg = `An error occurred: ${err.error.message}`;
        } else {
            // The backend returned an unsuccessful response code.
            // The response body may contain clues as to what went wrong,
            errorMsg = `Backend returned code ${err.status}, body was: ${err.error}`;
        }
        if (err.status === 404 || err.status === 403) {
            this.injector.get(UserService).purgeAuth();
            this.injector.get(ToasterService).showError(`Unauthorized`, errorMsg);
            this.injector.get(Router).navigateByUrl(`/login`);
        }
        console.error(errorMsg);
        return Observable.throw(errorMsg);
    }

    intercept(req: HttpRequest, next: HttpHandler): Observable> {
        // Clone the request to add the new header.
        const authReq = req.clone({headers: req.headers.set(Cookie.tokenKey, Cookie.getToken())});
        // Pass on the cloned request instead of the original request.
        return next.handle(authReq).catch(err => this.handleError(err));
    }
}

If you are using AOT in building try:

export function authInterceptorFactory(injector: Injector) {
    return new AuthInterceptor(injector);
}

providers: [
         {
            provide: HTTP_INTERCEPTORS,
            useFactory: authInterceptorFactory,
            multi: true,
            deps: [Injector]
        },
          .... other providers ...
]