/*
    * 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.
   */
  package org.eclipse.aether.transport.http;
  
  import org.apache.http.HttpHost;
  import org.apache.http.auth.AuthScope;
  import org.apache.http.auth.Credentials;
  import org.apache.http.client.CredentialsProvider;
  
  /**
   * Credentials provider that helps to isolate server from proxy credentials. Apache HttpClient uses a single provider
   * for both server and proxy auth, using the auth scope (host, port, etc.) to select the proper credentials. With regard
   * to redirects, we use an auth scope for server credentials that's not specific enough to not be mistaken for proxy
   * auth. This provider helps to maintain the proper isolation.
   */
  final class DemuxCredentialsProvider implements CredentialsProvider {
  
      private final CredentialsProvider serverCredentialsProvider;
  
      private final CredentialsProvider proxyCredentialsProvider;
  
      private final HttpHost proxy;
  
      DemuxCredentialsProvider(
              CredentialsProvider serverCredentialsProvider,
              CredentialsProvider proxyCredentialsProvider,
              HttpHost proxy) {
          this.serverCredentialsProvider = serverCredentialsProvider;
          this.proxyCredentialsProvider = proxyCredentialsProvider;
          this.proxy = proxy;
      }
  
      private CredentialsProvider getDelegate(AuthScope authScope) {
          if (proxy.getPort() == authScope.getPort() && proxy.getHostName().equalsIgnoreCase(authScope.getHost())) {
              return proxyCredentialsProvider;
          }
          return serverCredentialsProvider;
      }
  
      @Override
      public Credentials getCredentials(AuthScope authScope) {
          return getDelegate(authScope).getCredentials(authScope);
      }
  
      @Override
      public void setCredentials(AuthScope authScope, Credentials credentials) {
          getDelegate(authScope).setCredentials(authScope, credentials);
      }
  
      @Override
      public void clear() {
          serverCredentialsProvider.clear();
          proxyCredentialsProvider.clear();
      }
  }