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import { Injectable } from '@angular/core';
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import { HttpErrorResponse, HttpEvent, HttpHandler, HttpInterceptor, HttpRequest, HttpResponse } from '@angular/common/http';
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import { Router } from '@angular/router';
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import { Observable, throwError } from 'rxjs';
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import { tap } from 'rxjs/operators';
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@Injectable()
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export class AuthenticationInterceptor implements HttpInterceptor {
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constructor(private router: Router) {}
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intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
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return next.handle(request).pipe(
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tap( (event: HttpEvent<any>) => {
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if (event instanceof HttpResponse) {
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// do stuff with response if you want
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}
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},
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(err: any) => {
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if (err instanceof HttpErrorResponse) {
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console.log(err);
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if (err.status === 403) {
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console.log('Unauthorised!!', err);
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this.router.navigateByUrl('/403-forbidden', { skipLocationChange: true });
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} else {
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this.handleError(err);
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}
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}
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}
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)
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);
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}
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/*handleError function as provided by angular.io (copied on 22/10/2018)*/
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private handleError(error: HttpErrorResponse) {
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if (error.error instanceof ErrorEvent) {
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// A client-side or network error occurred. Handle it accordingly.
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console.error('An error occurred:', error.error.message);
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} else {
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// The backend returned an unsuccessful response code.
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// The response body may contain clues as to what went wrong,
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console.error(
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`Backend returned code ${error.status}, ` +
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`body was: ${error.error}`);
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}
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// return an observable with a user-facing error message
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return throwError(
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'Something bad happened; please try again later.');
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}
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}
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