1 /* 2 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/impl/client/DefaultRedirectHandler.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.impl.client; 33 34 import java.net.URI; 35 import java.net.URISyntaxException; 36 37 import org.apache.commons.logging.Log; 38 import org.apache.commons.logging.LogFactory; 39 import org.apache.http.Header; 40 import org.apache.http.HttpHost; 41 import org.apache.http.HttpRequest; 42 import org.apache.http.HttpResponse; 43 import org.apache.http.HttpStatus; 44 import org.apache.http.ProtocolException; 45 import org.apache.http.client.CircularRedirectException; 46 import org.apache.http.client.RedirectHandler; 47 import org.apache.http.client.params.ClientPNames; 48 import org.apache.http.client.utils.URIUtils; 49 import org.apache.http.params.HttpParams; 50 import org.apache.http.protocol.HttpContext; 51 import org.apache.http.protocol.ExecutionContext; 52 53 54 /** 55 * Default implementation of {@link RedirectHandler}. 56 * 57 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> 58 * 59 * 60 * <!-- empty lines to avoid svn diff problems --> 61 * @version $Revision: 673450 $ 62 * 63 * @since 4.0 64 * 65 * @deprecated Please use {@link java.net.URL#openConnection} instead. 66 * Please visit <a href="http://android-developers.blogspot.com/2011/09/androids-http-clients.html">this webpage</a> 67 * for further details. 68 */ 69 @Deprecated 70 public class DefaultRedirectHandler implements RedirectHandler { 71 72 private final Log log = LogFactory.getLog(getClass()); 73 74 private static final String REDIRECT_LOCATIONS = "http.protocol.redirect-locations"; 75 DefaultRedirectHandler()76 public DefaultRedirectHandler() { 77 super(); 78 } 79 isRedirectRequested( final HttpResponse response, final HttpContext context)80 public boolean isRedirectRequested( 81 final HttpResponse response, 82 final HttpContext context) { 83 if (response == null) { 84 throw new IllegalArgumentException("HTTP response may not be null"); 85 } 86 int statusCode = response.getStatusLine().getStatusCode(); 87 switch (statusCode) { 88 case HttpStatus.SC_MOVED_TEMPORARILY: 89 case HttpStatus.SC_MOVED_PERMANENTLY: 90 case HttpStatus.SC_SEE_OTHER: 91 case HttpStatus.SC_TEMPORARY_REDIRECT: 92 return true; 93 default: 94 return false; 95 } //end of switch 96 } 97 getLocationURI( final HttpResponse response, final HttpContext context)98 public URI getLocationURI( 99 final HttpResponse response, 100 final HttpContext context) throws ProtocolException { 101 if (response == null) { 102 throw new IllegalArgumentException("HTTP response may not be null"); 103 } 104 //get the location header to find out where to redirect to 105 Header locationHeader = response.getFirstHeader("location"); 106 if (locationHeader == null) { 107 // got a redirect response, but no location header 108 throw new ProtocolException( 109 "Received redirect response " + response.getStatusLine() 110 + " but no location header"); 111 } 112 String location = locationHeader.getValue(); 113 if (this.log.isDebugEnabled()) { 114 this.log.debug("Redirect requested to location '" + location + "'"); 115 } 116 117 URI uri; 118 try { 119 uri = new URI(location); 120 } catch (URISyntaxException ex) { 121 throw new ProtocolException("Invalid redirect URI: " + location, ex); 122 } 123 124 HttpParams params = response.getParams(); 125 // rfc2616 demands the location value be a complete URI 126 // Location = "Location" ":" absoluteURI 127 if (!uri.isAbsolute()) { 128 if (params.isParameterTrue(ClientPNames.REJECT_RELATIVE_REDIRECT)) { 129 throw new ProtocolException("Relative redirect location '" 130 + uri + "' not allowed"); 131 } 132 // Adjust location URI 133 HttpHost target = (HttpHost) context.getAttribute( 134 ExecutionContext.HTTP_TARGET_HOST); 135 if (target == null) { 136 throw new IllegalStateException("Target host not available " + 137 "in the HTTP context"); 138 } 139 140 HttpRequest request = (HttpRequest) context.getAttribute( 141 ExecutionContext.HTTP_REQUEST); 142 143 try { 144 URI requestURI = new URI(request.getRequestLine().getUri()); 145 URI absoluteRequestURI = URIUtils.rewriteURI(requestURI, target, true); 146 uri = URIUtils.resolve(absoluteRequestURI, uri); 147 } catch (URISyntaxException ex) { 148 throw new ProtocolException(ex.getMessage(), ex); 149 } 150 } 151 152 if (params.isParameterFalse(ClientPNames.ALLOW_CIRCULAR_REDIRECTS)) { 153 154 RedirectLocations redirectLocations = (RedirectLocations) context.getAttribute( 155 REDIRECT_LOCATIONS); 156 157 if (redirectLocations == null) { 158 redirectLocations = new RedirectLocations(); 159 context.setAttribute(REDIRECT_LOCATIONS, redirectLocations); 160 } 161 162 URI redirectURI; 163 if (uri.getFragment() != null) { 164 try { 165 HttpHost target = new HttpHost( 166 uri.getHost(), 167 uri.getPort(), 168 uri.getScheme()); 169 redirectURI = URIUtils.rewriteURI(uri, target, true); 170 } catch (URISyntaxException ex) { 171 throw new ProtocolException(ex.getMessage(), ex); 172 } 173 } else { 174 redirectURI = uri; 175 } 176 177 if (redirectLocations.contains(redirectURI)) { 178 throw new CircularRedirectException("Circular redirect to '" + 179 redirectURI + "'"); 180 } else { 181 redirectLocations.add(redirectURI); 182 } 183 } 184 185 return uri; 186 } 187 188 } 189