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 * 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
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 * <http://www.apache.org/>.
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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.

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
Deprecated:
(4.2) use AuthenticationStrategy/**
/**
 * 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
 *
 * @deprecated (4.2)  use {@link AuthenticationStrategy}
 */
@Deprecated
public interface AuthenticationHandler {

    
Determines if the given HTTP response response represents
an authentication challenge that was sent back as a result
of authentication failure
Params:
response – HTTP response.
context – HTTP context.
Returns:
true if user authentication is required, false otherwise./**
     * 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.
Params:
response – HTTP response.
context – HTTP context.
Throws:
MalformedChallengeException – if one of the authentication
 challenges is not valid or malformed.
Returns:
a collection of challenges keyed by names of corresponding
authentication schemes./**
     * 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 AuthScheme instance capable of processing that challenge. 
Params:
challenges – collection of challenges.
response – HTTP response.
context – HTTP context.
Throws:
AuthenticationException – if an authentication scheme
 could not be selected.
Returns:
authentication scheme to use for authentication./**
     * 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;

}