src/app/services/config/config.service.ts
// SPDX-License-Identifier: Apache-2.0
// Copyright (c) 2018 Georgi Marinov
//
// Licensed 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 { environment } from '../../../environments/environment';
import { errorHandler } from '../error-handler/error-handler.service';
import { logger } from '../../services/logger/logger.service';
/**
* Config service.
*/
@Injectable({
providedIn: 'root'
})
export class ConfigService {
/** Config endpoint */
private readonly configEndpoint = '/config';
/** Fetch config */
public fetchConfig(configEndpoint = this.configEndpoint) {
return fetch(configEndpoint)
.then(this.onResponse)
.then(this.onConfig)
.catch(this.onError);
}
/** Response handler */
private onResponse(response: Response) {
const contentType = response.headers.get('content-type');
if (contentType && contentType.indexOf('application/json') !== -1) {
return response.json();
} else {
logger.debug(`ConfigService: fetchConfig: No config fetched.`);
return response;
}
}
/** Config handler */
private onConfig(config: any) {
for (const key in config) {
if (Object.prototype.hasOwnProperty.call(config, key)) {
const value = config[key];
(environment as typeof config)[key] = value;
logger.debug(`ConfigService: fetchConfig: Transferred config key: ${key}: ${value}`);
}
}
}
/** Error handler */
private onError(reason: any) {
errorHandler.loggerErrorHandler(reason);
logger.debug(`ConfigService: fetchConfig: No config transferred. Using defaults...`);
}
}