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Java example source code file (AuthenticationHandler.java)

This example source code file (AuthenticationHandler.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

authenticationexception, authenticationhandler, authscheme, header, httpcontext, httpresponse, malformedchallengeexception, map, util

The AuthenticationHandler.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;

import java.util.Map;

import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScheme;
import org.apache.http.auth.AuthenticationException;
import org.apache.http.auth.MalformedChallengeException;
import org.apache.http.protocol.HttpContext;

/**
/**
 * A handler for determining if an HTTP response represents an authentication 
 * challenge that was sent back to the client as a result of authentication 
 * failure.
 * <p>
 * Implementations of this interface must be thread-safe. Access to shared
 * data must be synchronized as methods of this interface may be executed 
 * from multiple threads.
 *
 * @since 4.0
 */
public interface AuthenticationHandler {

    /**
     * Determines if the given HTTP response response represents 
     * an authentication challenge that was sent back as a result 
     * of authentication failure
     * @param response HTTP response.
     * @param context HTTP context.
     * @return <code>true if user authentication is required,
     *   <code>false otherwise.
     */
    boolean isAuthenticationRequested(
            HttpResponse response, 
            HttpContext context);

    /**
     * Extracts from the given HTTP response a collection of authentication 
     * challenges, each of which represents an authentication scheme supported
     * by the authentication host.   
     * 
     * @param response HTTP response.
     * @param context HTTP context.
     * @return a collection of challenges keyed by names of corresponding 
     * authentication schemes. 
     * @throws MalformedChallengeException if one of the authentication 
     *  challenges is not valid or malformed.
     */
    Map<String, Header> getChallenges(
            HttpResponse response, 
            HttpContext context) throws MalformedChallengeException;
    
    /**
     * Selects one authentication challenge out of all available and
     * creates and generates {@link AuthScheme} instance capable of
     * processing that challenge.
     * @param challenges collection of challenges.
     * @param response HTTP response.
     * @param context HTTP context.
     * @return authentication scheme to use for authentication.
     * @throws AuthenticationException if an authentication scheme
     *  could not be selected.
     */
    AuthScheme selectScheme(
            Map<String, Header> challenges, 
            HttpResponse response, 
            HttpContext context) throws AuthenticationException;
    
}

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