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Java example source code file (RequestAddCookies.java)

This example source code file (RequestAddCookies.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

cookie, cookieorigin, cookiespec, cookiespecregistry, cookiestore, date, http, illegalargumentexception, illegalstateexception, io, list, managedclientconnection, net, network, schemeregistry, string, uri, util

The RequestAddCookies.java example source code

/*
 * ====================================================================
 * 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.http.client.protocol;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.http.annotation.Immutable;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.Header;
import org.apache.http.HttpException;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.ProtocolException;
import org.apache.http.client.CookieStore;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.params.HttpClientParams;
import org.apache.http.conn.ManagedClientConnection;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.cookie.Cookie;
import org.apache.http.cookie.CookieOrigin;
import org.apache.http.cookie.CookieSpec;
import org.apache.http.cookie.CookieSpecRegistry;
import org.apache.http.cookie.SetCookie2;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.ExecutionContext;

/**
 * Request interceptor that matches cookies available in the current
 * {@link CookieStore} to the request being executed and generates 
 * corresponding <code>Cookie request headers.
 * <p>
 * The following parameters can be used to customize the behavior of this 
 * class: 
 * <ul>
 *  <li>{@link org.apache.http.cookie.params.CookieSpecPNames#DATE_PATTERNS}
 *  <li>{@link org.apache.http.cookie.params.CookieSpecPNames#SINGLE_COOKIE_HEADER}
 *  <li>{@link org.apache.http.client.params.ClientPNames#COOKIE_POLICY}
 * </ul>
 * 
 * @since 4.0
 */
@Immutable
public class RequestAddCookies implements HttpRequestInterceptor {

    private final Log log = LogFactory.getLog(getClass());
    
    public RequestAddCookies() {
        super();
    }
    
    public void process(final HttpRequest request, final HttpContext context) 
            throws HttpException, IOException {
        if (request == null) {
            throw new IllegalArgumentException("HTTP request may not be null");
        }
        if (context == null) {
            throw new IllegalArgumentException("HTTP context may not be null");
        }
        
        String method = request.getRequestLine().getMethod();
        if (method.equalsIgnoreCase("CONNECT")) {
            return;
        }
        
        // Obtain cookie store
        CookieStore cookieStore = (CookieStore) context.getAttribute(
                ClientContext.COOKIE_STORE);
        if (cookieStore == null) {
            this.log.info("Cookie store not available in HTTP context");
            return;
        }
        
        // Obtain the registry of cookie specs
        CookieSpecRegistry registry = (CookieSpecRegistry) context.getAttribute(
                ClientContext.COOKIESPEC_REGISTRY);
        if (registry == null) {
            this.log.info("CookieSpec registry not available in HTTP context");
            return;
        }
        
        // Obtain the target host (required)
        HttpHost targetHost = (HttpHost) context.getAttribute(
                ExecutionContext.HTTP_TARGET_HOST);
        if (targetHost == null) {
            throw new IllegalStateException("Target host not specified in HTTP context");
        }
        
        // Obtain the client connection (required)
        ManagedClientConnection conn = (ManagedClientConnection) context.getAttribute(
                ExecutionContext.HTTP_CONNECTION);
        if (conn == null) {
            throw new IllegalStateException("Client connection not specified in HTTP context");
        }

        String policy = HttpClientParams.getCookiePolicy(request.getParams());
        if (this.log.isDebugEnabled()) {
            this.log.debug("CookieSpec selected: " + policy);
        }
        
        URI requestURI;
        if (request instanceof HttpUriRequest) {
            requestURI = ((HttpUriRequest) request).getURI();
        } else {
            try {
                requestURI = new URI(request.getRequestLine().getUri());
            } catch (URISyntaxException ex) {
                throw new ProtocolException("Invalid request URI: " + 
                        request.getRequestLine().getUri(), ex);
            }
        }
        
        String hostName = targetHost.getHostName();
        int port = targetHost.getPort();
        if (port < 0) {

            // Obtain the scheme registry
            SchemeRegistry sr = (SchemeRegistry) context.getAttribute(
                    ClientContext.SCHEME_REGISTRY);
            if (sr != null) {
                Scheme scheme = sr.get(targetHost.getSchemeName());
                port = scheme.resolvePort(port);
            } else {
                port = conn.getRemotePort();
            }
        }
        
        CookieOrigin cookieOrigin = new CookieOrigin(
                hostName, 
                port, 
                requestURI.getPath(),
                conn.isSecure());
        
        // Get an instance of the selected cookie policy
        CookieSpec cookieSpec = registry.getCookieSpec(policy, request.getParams());
        // Get all cookies available in the HTTP state
        List<Cookie> cookies = new ArrayList(cookieStore.getCookies());
        // Find cookies matching the given origin
        List<Cookie> matchedCookies = new ArrayList();
        Date now = new Date();
        for (Cookie cookie : cookies) {
            if (!cookie.isExpired(now)) {
                if (cookieSpec.match(cookie, cookieOrigin)) {
                    if (this.log.isDebugEnabled()) {
                        this.log.debug("Cookie " + cookie + " match " + cookieOrigin);
                    }
                    matchedCookies.add(cookie);
                }
            } else {
                if (this.log.isDebugEnabled()) {
                    this.log.debug("Cookie " + cookie + " expired");
                }
            }
        }
        // Generate Cookie request headers
        if (!matchedCookies.isEmpty()) {
            List<Header> headers = cookieSpec.formatCookies(matchedCookies);
            for (Header header : headers) {
                request.addHeader(header);
            }
        }
        
        int ver = cookieSpec.getVersion();
        if (ver > 0) {
            boolean needVersionHeader = false;
            for (Cookie cookie : matchedCookies) {
                if (ver != cookie.getVersion() || !(cookie instanceof SetCookie2)) {
                    needVersionHeader = true;
                }
            }

            if (needVersionHeader) {
                Header header = cookieSpec.getVersionHeader();
                if (header != null) {
                    // Advertise cookie version support
                    request.addHeader(header);
                }
            }
        }
        
        // Stick the CookieSpec and CookieOrigin instances to the HTTP context
        // so they could be obtained by the response interceptor
        context.setAttribute(ClientContext.COOKIE_SPEC, cookieSpec);
        context.setAttribute(ClientContext.COOKIE_ORIGIN, cookieOrigin);
    }
    
}

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