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/*
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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
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 * .
 *
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package org.apache.http.impl.client;

import java.security.Principal;

import javax.net.ssl.SSLSession;

import org.apache.http.HttpConnection;
import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.auth.AuthScheme;
import org.apache.http.auth.AuthState;
import org.apache.http.auth.Credentials;
import org.apache.http.client.UserTokenHandler;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.conn.ManagedHttpClientConnection;
import org.apache.http.protocol.HttpContext;

/**
 * Default implementation of {@link UserTokenHandler}. This class will use
 * an instance of {@link Principal} as a state object for HTTP connections,
 * if it can be obtained from the given execution context. This helps ensure
 * persistent connections created with a particular user identity within
 * a particular security context can be reused by the same user only.
 * 

* DefaultUserTokenHandler will use the user principal of connection * based authentication schemes such as NTLM or that of the SSL session * with the client authentication turned on. If both are unavailable, * {@code null} token will be returned. * * @since 4.0 */ @Contract(threading = ThreadingBehavior.IMMUTABLE) public class DefaultUserTokenHandler implements UserTokenHandler { public static final DefaultUserTokenHandler INSTANCE = new DefaultUserTokenHandler(); @Override public Object getUserToken(final HttpContext context) { final HttpClientContext clientContext = HttpClientContext.adapt(context); Principal userPrincipal = null; final AuthState targetAuthState = clientContext.getTargetAuthState(); if (targetAuthState != null) { userPrincipal = getAuthPrincipal(targetAuthState); if (userPrincipal == null) { final AuthState proxyAuthState = clientContext.getProxyAuthState(); userPrincipal = getAuthPrincipal(proxyAuthState); } } if (userPrincipal == null) { final HttpConnection conn = clientContext.getConnection(); if (conn.isOpen() && conn instanceof ManagedHttpClientConnection) { final SSLSession sslsession = ((ManagedHttpClientConnection) conn).getSSLSession(); if (sslsession != null) { userPrincipal = sslsession.getLocalPrincipal(); } } } return userPrincipal; } private static Principal getAuthPrincipal(final AuthState authState) { final AuthScheme scheme = authState.getAuthScheme(); if (scheme != null && scheme.isComplete() && scheme.isConnectionBased()) { final Credentials creds = authState.getCredentials(); if (creds != null) { return creds.getUserPrincipal(); } } return null; } }





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