/*!
 * @license
 * Copyright 2019 Alfresco Software, Ltd.
 *
 * 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 { Observable, Observer } from 'rxjs';
import { HttpHeaders } from '@angular/common/http';

export abstract class BaseAuthenticationService {
    protected bearerExcludedUrls: string[] = ['auth/realms', 'resources/', 'assets/'];

    abstract getToken(): string;

    getBearerExcludedUrls(): string[] {
        return this.bearerExcludedUrls;
    }

    addTokenToHeader(headersArg?: HttpHeaders): Observable<HttpHeaders> {
        return new Observable((observer: Observer<any>) => {
            let headers = headersArg;
            if (!headers) {
                headers = new HttpHeaders();
            }
            try {
                const token: string = this.getToken();
                headers = headers.set('Authorization', 'Bearer ' + token);
                observer.next(headers);
                observer.complete();
            } catch (error) {
                observer.error(error);
            }
        });
    }
}