/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.http.impl.client;
  
  import java.util.List;
  import java.util.Map;
  
  import org.apache.http.annotation.Immutable;
  
  import org.apache.http.Header;
  import org.apache.http.HttpResponse;
  import org.apache.http.HttpStatus;
  import org.apache.http.auth.AUTH;
  import org.apache.http.auth.MalformedChallengeException;
  import org.apache.http.auth.params.AuthPNames;
  import org.apache.http.client.AuthenticationHandler;
  import org.apache.http.protocol.HttpContext;
  
  /**
   * Default {@link AuthenticationHandler} implementation for target host
   * authentication.
   *
   * @since 4.0
   *
   * @deprecated (4.2)  use {@link TargetAuthenticationStrategy}
   */
  @Deprecated
  @Immutable
  public class DefaultTargetAuthenticationHandler extends AbstractAuthenticationHandler {
  
      public DefaultTargetAuthenticationHandler() {
          super();
      }
  
      public boolean isAuthenticationRequested(
              final HttpResponse response,
              final HttpContext context) {
          if (response == null) {
              throw new IllegalArgumentException("HTTP response may not be null");
          }
          int status = response.getStatusLine().getStatusCode();
          return status == HttpStatus.SC_UNAUTHORIZED;
      }
  
      public Map<String, Header> getChallenges(
              final HttpResponse response,
              final HttpContext context) throws MalformedChallengeException {
          if (response == null) {
              throw new IllegalArgumentException("HTTP response may not be null");
          }
          Header[] headers = response.getHeaders(AUTH.WWW_AUTH);
          return parseChallenges(headers);
      }
  
      @Override
      protected List<String> getAuthPreferences(
              final HttpResponse response,
              final HttpContext context) {
          @SuppressWarnings("unchecked")
          List<String> authpref = (List<String>) response.getParams().getParameter(
                  AuthPNames.TARGET_AUTH_PREF);
          if (authpref != null) {
              return authpref;
          } else {
              return super.getAuthPreferences(response, context);
          }
      }
  
  }