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 * 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
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 * Unless required by applicable law or agreed to in writing,
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 * specific language governing permissions and limitations
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package org.apache.hc.client5.http.impl;

import java.security.Principal;

import javax.net.ssl.SSLSession;

import org.apache.hc.client5.http.HttpRoute;
import org.apache.hc.client5.http.UserTokenHandler;
import org.apache.hc.client5.http.auth.AuthExchange;
import org.apache.hc.client5.http.auth.AuthScheme;
import org.apache.hc.client5.http.protocol.HttpClientContext;
import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.HttpRequest;
import org.apache.hc.core5.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.STATELESS) public class DefaultUserTokenHandler implements UserTokenHandler { /** * Default instance of {@link DefaultUserTokenHandler}. */ public static final DefaultUserTokenHandler INSTANCE = new DefaultUserTokenHandler(); @Override public Object getUserToken(final HttpRoute route, final HttpContext context) { return getUserToken(route, null, context); } @Override public Object getUserToken(final HttpRoute route, final HttpRequest request, final HttpContext context) { final HttpClientContext clientContext = HttpClientContext.cast(context); final HttpHost target = request != null ? new HttpHost(request.getScheme(), request.getAuthority()) : route.getTargetHost(); final AuthExchange targetAuthExchange = clientContext.getAuthExchange(target); if (targetAuthExchange != null) { final Principal authPrincipal = getAuthPrincipal(targetAuthExchange); if (authPrincipal != null) { return authPrincipal; } } final HttpHost proxy = route.getProxyHost(); if (proxy != null) { final AuthExchange proxyAuthExchange = clientContext.getAuthExchange(proxy); if (proxyAuthExchange != null) { final Principal authPrincipal = getAuthPrincipal(proxyAuthExchange); if (authPrincipal != null) { return authPrincipal; } } } final SSLSession sslSession = clientContext.getSSLSession(); if (sslSession != null) { return sslSession.getLocalPrincipal(); } return null; } private static Principal getAuthPrincipal(final AuthExchange authExchange) { final AuthScheme scheme = authExchange.getAuthScheme(); if (scheme != null && scheme.isConnectionBased()) { return scheme.getPrincipal(); } return null; } }




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