/*
    * ====================================================================
    * 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.client.protocol;
  
  import java.io.IOException;
  
  import org.apache.http.HttpException;
  import org.apache.http.HttpRequest;
  import org.apache.http.annotation.Contract;
  import org.apache.http.annotation.ThreadingBehavior;
  import org.apache.http.auth.AUTH;
  import org.apache.http.auth.AuthState;
  import org.apache.http.conn.HttpRoutedConnection;
  import org.apache.http.conn.routing.HttpRoute;
  import org.apache.http.protocol.ExecutionContext;
  import org.apache.http.protocol.HttpContext;
  import org.apache.http.util.Args;
  
  /**
   * Generates authentication header for the proxy host, if required,
   * based on the actual state of the HTTP authentication context.
   *
   * @since 4.0
   *
   * @deprecated (4.3) use {@link org.apache.http.impl.auth.HttpAuthenticator}.
   */
  @Deprecated
  @Contract(threading = ThreadingBehavior.IMMUTABLE)
  public class RequestProxyAuthentication extends RequestAuthenticationBase {
  
      public RequestProxyAuthentication() {
          super();
      }
  
      @Override
      public void process(final HttpRequest request, final HttpContext context)
              throws HttpException, IOException {
          Args.notNull(request, "HTTP request");
          Args.notNull(context, "HTTP context");
  
          if (request.containsHeader(AUTH.PROXY_AUTH_RESP)) {
              return;
          }
  
          final HttpRoutedConnection../org/apache/http/conn/HttpRoutedConnection.html#HttpRoutedConnection">HttpRoutedConnection conn = (HttpRoutedConnection) context.getAttribute(
                  ExecutionContext.HTTP_CONNECTION);
          if (conn == null) {
              this.log.debug("HTTP connection not set in the context");
              return;
          }
          final HttpRoute route = conn.getRoute();
          if (route.isTunnelled()) {
              return;
          }
  
          // Obtain authentication state
          final AuthState../../../org/apache/http/auth/AuthState.html#AuthState">AuthState authState = (AuthState) context.getAttribute(
                  ClientContext.PROXY_AUTH_STATE);
          if (authState == null) {
              this.log.debug("Proxy auth state not set in the context");
              return;
          }
          if (this.log.isDebugEnabled()) {
              this.log.debug("Proxy auth state: " + authState.getState());
          }
          process(authState, request, context);
      }
  
  }