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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.nio.client;

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.nio.conn.ManagedNHttpClientConnection;
import org.apache.http.protocol.HttpContext;

import javax.net.ssl.SSLSession;
import java.security.Principal;

/**
 * Default implementation of {@link org.apache.http.client.UserTokenHandler}
 * for asynchrounous HTTP client communication. This class will use
 * an instance of {@link java.security.Principal} as a state object for
 * non-blocking 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.
 * 

* This implementation will use the user principle 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 DefaultAsyncUserTokenHandler implements UserTokenHandler { public static final DefaultAsyncUserTokenHandler INSTANCE = new DefaultAsyncUserTokenHandler(); @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 ManagedNHttpClientConnection) { final SSLSession sslsession = ((ManagedNHttpClientConnection) 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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