gateway-admin-ui/admin-ui/app/sessionInformation/session.information.service.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 {HttpClient, HttpErrorResponse, HttpHeaders} from '@angular/common/http';
import Swal from 'sweetalert2';

import 'rxjs/add/operator/toPromise';
import {SessionInformation} from './session.information';

@Injectable()
export class SessionInformationService {
    pathParts = window.location.pathname.split('/');
    topologyContext = '/' + this.pathParts[1] + '/' + this.pathParts[2] + '/';
    sessionUrl = this.topologyContext + 'session/api/v1/sessioninfo';

    constructor(private http: HttpClient) {}

    getSessionInformation(): Promise<SessionInformation> {
        let headers = new HttpHeaders();
        headers = this.addJsonHeaders(headers);
        return this.http.get(this.sessionUrl, { headers: headers})
            .toPromise()
            .then(response => response['sessioninfo'] as SessionInformation)
            .catch((err: HttpErrorResponse) => {
                console.debug('HomepageService --> getSessionInformation() --> ' + this.sessionUrl + '\n  error: ' + err.message);
                if (err.status === 401) {
                    window.location.assign(document.location.pathname);
                } else {
                    return this.handleError(err);
                }
            });
    }

    addJsonHeaders(headers: HttpHeaders): HttpHeaders {
        return this.addCsrfHeaders(headers.append('Accept', 'application/json').append('Content-Type', 'application/json'));
    }

    addCsrfHeaders(headers: HttpHeaders): HttpHeaders {
        return this.addXHRHeaders(headers.append('X-XSRF-Header', 'homepage'));
    }

    addXHRHeaders(headers: HttpHeaders): HttpHeaders {
        return headers.append('X-Requested-With', 'XMLHttpRequest');
    }

    private handleError(error: HttpErrorResponse): Promise<any> {
        Swal.fire({
            icon: 'error',
            title: 'Oops!',
            text: 'Something went wrong!\n' + (error.error ? error.error : error.statusText),
            confirmButtonColor: '#7cd1f9'
        });
        return Promise.reject(error.message || error);
    }
}