/*
 * 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 } from 'rxjs';

@Injectable()
export class NoCacheInterceptor implements HttpInterceptor {
  private addNoCacheToUrl(url: string) {
    const separator = url.indexOf('?') === -1 ? '?' : '&';
    const returnUrl = url + separator + 'noCache=' + new Date().getTime();

    return returnUrl;
  }

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    const apiReq = req.clone({ url: this.addNoCacheToUrl(req.url) });
    return next.handle(apiReq);
  }
}