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/*
 * ====================================================================
 * 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
 * .
 *
 */

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 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 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);
    }

}