metron-interface/metron-alerts/src/app/service/app-config.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 } from '@angular/common/http';

@Injectable()
export class AppConfigService {

  private static appConfigStatic;

  static getAppConfigStatic() {
    return AppConfigService.appConfigStatic;
  }

  constructor(private http: HttpClient) { }

  loadAppConfig() {
    return this.http.get('assets/app-config.json')
            // APP_INITIALIZER only supports promises
            .toPromise()
            .then(data => {
              AppConfigService.appConfigStatic = data;
            });
  }

  getApiRoot() {
    if (AppConfigService.appConfigStatic['apiRoot'] === undefined) {
      console.error('[AppConfigService] apiRoot entry is missing from /assets/app-config.json');
    }
    return AppConfigService.appConfigStatic['apiRoot']
  }

  getLoginPath() {
    if (AppConfigService.appConfigStatic['loginPath'] === undefined) {
      console.error('[AppConfigService] loginPath entry is missing from /assets/app-config.json');
    }
    return AppConfigService.appConfigStatic['loginPath'];
  }

  getContextMenuConfigURL() {
    if (AppConfigService.appConfigStatic['contextMenuConfigURL'] === undefined) {
      console.error('[AppConfigService] contextMenuConfigURL entry is missing from /assets/app-config.json');
    }
    return AppConfigService.appConfigStatic['contextMenuConfigURL'];
  }
}