| /* |
| * ==================================================================== |
| * 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 |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| |
| package org.apache.hc.client5.http.impl; |
| |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.util.Locale; |
| |
| import org.apache.hc.client5.http.protocol.RedirectStrategy; |
| import org.apache.hc.client5.http.utils.URIUtils; |
| import org.apache.hc.core5.annotation.Contract; |
| import org.apache.hc.core5.annotation.ThreadingBehavior; |
| import org.apache.hc.core5.http.Header; |
| import org.apache.hc.core5.http.HttpException; |
| import org.apache.hc.core5.http.HttpHeaders; |
| import org.apache.hc.core5.http.HttpRequest; |
| import org.apache.hc.core5.http.HttpResponse; |
| import org.apache.hc.core5.http.HttpStatus; |
| import org.apache.hc.core5.http.ProtocolException; |
| import org.apache.hc.core5.http.protocol.HttpContext; |
| import org.apache.hc.core5.net.URIBuilder; |
| import org.apache.hc.core5.util.Args; |
| import org.apache.hc.core5.util.TextUtils; |
| |
| /** |
| * Default implementation of {@link RedirectStrategy}. |
| * |
| * @since 4.1 |
| */ |
| @Contract(threading = ThreadingBehavior.STATELESS) |
| public class DefaultRedirectStrategy implements RedirectStrategy { |
| |
| public static final DefaultRedirectStrategy INSTANCE = new DefaultRedirectStrategy(); |
| |
| @Override |
| public boolean isRedirected( |
| final HttpRequest request, |
| final HttpResponse response, |
| final HttpContext context) throws ProtocolException { |
| Args.notNull(request, "HTTP request"); |
| Args.notNull(response, "HTTP response"); |
| |
| if (!response.containsHeader(HttpHeaders.LOCATION)) { |
| return false; |
| } |
| final int statusCode = response.getCode(); |
| switch (statusCode) { |
| case HttpStatus.SC_MOVED_PERMANENTLY: |
| case HttpStatus.SC_MOVED_TEMPORARILY: |
| case HttpStatus.SC_SEE_OTHER: |
| case HttpStatus.SC_TEMPORARY_REDIRECT: |
| case HttpStatus.SC_PERMANENT_REDIRECT: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| @Override |
| public URI getLocationURI( |
| final HttpRequest request, |
| final HttpResponse response, |
| final HttpContext context) throws HttpException { |
| Args.notNull(request, "HTTP request"); |
| Args.notNull(response, "HTTP response"); |
| Args.notNull(context, "HTTP context"); |
| |
| //get the location header to find out where to redirect to |
| final Header locationHeader = response.getFirstHeader("location"); |
| if (locationHeader == null) { |
| throw new HttpException("Redirect location is missing"); |
| } |
| final String location = locationHeader.getValue(); |
| URI uri = createLocationURI(location); |
| try { |
| if (!uri.isAbsolute()) { |
| // Resolve location URI |
| uri = URIUtils.resolve(request.getUri(), uri); |
| } |
| } catch (final URISyntaxException ex) { |
| throw new ProtocolException(ex.getMessage(), ex); |
| } |
| |
| return uri; |
| } |
| |
| /** |
| * @since 4.1 |
| */ |
| protected URI createLocationURI(final String location) throws ProtocolException { |
| try { |
| final URIBuilder b = new URIBuilder(new URI(location).normalize()); |
| final String host = b.getHost(); |
| if (host != null) { |
| b.setHost(host.toLowerCase(Locale.ROOT)); |
| } |
| final String path = b.getPath(); |
| if (TextUtils.isEmpty(path)) { |
| b.setPath("/"); |
| } |
| return b.build(); |
| } catch (final URISyntaxException ex) { |
| throw new ProtocolException("Invalid redirect URI: " + location, ex); |
| } |
| } |
| |
| } |