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      1 /*
      2  * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/client/protocol/RequestTargetAuthentication.java $
      3  * $Revision: 673450 $
      4  * $Date: 2008-07-02 10:35:05 -0700 (Wed, 02 Jul 2008) $
      5  *
      6  * ====================================================================
      7  * Licensed to the Apache Software Foundation (ASF) under one
      8  * or more contributor license agreements.  See the NOTICE file
      9  * distributed with this work for additional information
     10  * regarding copyright ownership.  The ASF licenses this file
     11  * to you under the Apache License, Version 2.0 (the
     12  * "License"); you may not use this file except in compliance
     13  * with the License.  You may obtain a copy of the License at
     14  *
     15  *   http://www.apache.org/licenses/LICENSE-2.0
     16  *
     17  * Unless required by applicable law or agreed to in writing,
     18  * software distributed under the License is distributed on an
     19  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     20  * KIND, either express or implied.  See the License for the
     21  * specific language governing permissions and limitations
     22  * under the License.
     23  * ====================================================================
     24  *
     25  * This software consists of voluntary contributions made by many
     26  * individuals on behalf of the Apache Software Foundation.  For more
     27  * information on the Apache Software Foundation, please see
     28  * <http://www.apache.org/>.
     29  *
     30  */
     31 
     32 package org.apache.http.client.protocol;
     33 
     34 import java.io.IOException;
     35 
     36 import org.apache.commons.logging.Log;
     37 import org.apache.commons.logging.LogFactory;
     38 import org.apache.http.HttpException;
     39 import org.apache.http.HttpRequest;
     40 import org.apache.http.HttpRequestInterceptor;
     41 import org.apache.http.auth.AUTH;
     42 import org.apache.http.auth.AuthScheme;
     43 import org.apache.http.auth.AuthState;
     44 import org.apache.http.auth.AuthenticationException;
     45 import org.apache.http.auth.Credentials;
     46 import org.apache.http.protocol.HttpContext;
     47 
     48 /**
     49  * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
     50  *
     51  * @version $Revision: 673450 $
     52  *
     53  * @since 4.0
     54  */
     55 public class RequestTargetAuthentication implements HttpRequestInterceptor {
     56 
     57     private final Log log = LogFactory.getLog(getClass());
     58 
     59     public RequestTargetAuthentication() {
     60         super();
     61     }
     62 
     63     public void process(final HttpRequest request, final HttpContext context)
     64             throws HttpException, IOException {
     65         if (request == null) {
     66             throw new IllegalArgumentException("HTTP request may not be null");
     67         }
     68         if (context == null) {
     69             throw new IllegalArgumentException("HTTP context may not be null");
     70         }
     71 
     72         if (request.containsHeader(AUTH.WWW_AUTH_RESP)) {
     73             return;
     74         }
     75 
     76         // Obtain authentication state
     77         AuthState authState = (AuthState) context.getAttribute(
     78                 ClientContext.TARGET_AUTH_STATE);
     79         if (authState == null) {
     80             return;
     81         }
     82 
     83         AuthScheme authScheme = authState.getAuthScheme();
     84         if (authScheme == null) {
     85             return;
     86         }
     87 
     88         Credentials creds = authState.getCredentials();
     89         if (creds == null) {
     90             this.log.debug("User credentials not available");
     91             return;
     92         }
     93 
     94         if (authState.getAuthScope() != null || !authScheme.isConnectionBased()) {
     95             try {
     96                 request.addHeader(authScheme.authenticate(creds, request));
     97             } catch (AuthenticationException ex) {
     98                 if (this.log.isErrorEnabled()) {
     99                     this.log.error("Authentication error: " + ex.getMessage());
    100                 }
    101             }
    102         }
    103     }
    104 
    105 }
    106