services/self-service/src/main/resources/webapp/src/app/core/interceptors/error.interceptor.ts

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import { Injectable } from '@angular/core';
import {
    HttpInterceptor,
    HttpRequest,
    HttpHandler,
    HttpEvent
} from '@angular/common/http';

import { Observable, throwError, of as observableOf } from 'rxjs';
import { map, catchError } from 'rxjs/operators';

import { StorageService, AppRoutingService } from '../services';
import { HTTP_STATUS_CODES } from '../util';

@Injectable() export class ErrorInterceptor implements HttpInterceptor {
  constructor(
    private jwtService: StorageService,
    private routingService: AppRoutingService
  ) {}

  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    return next.handle(request).pipe(
      catchError(error => {
        let url = error.url;

        if (url.indexOf('?') > -1) {
          url = url.substr(0, url.indexOf('?'));
        }

        if ((error.status === HTTP_STATUS_CODES.UNAUTHORIZED) && !url.endsWith('login')) {
          this.jwtService.destroyToken();
          this.routingService.redirectToLoginPage();
          return observableOf(error);
        } else {
          return throwError(error);
        }
      }));
    }
}