/*
 * ====================================================================
 *
 *  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 ch.boye.httpclientandroidlib.auth;

import ch.boye.httpclientandroidlib.Header;
import ch.boye.httpclientandroidlib.HttpRequest;
import ch.boye.httpclientandroidlib.protocol.HttpContext;

/**
 * This interface represents an extended  authentication scheme
 * that requires access to {@link HttpContext} in order to
 * generate an authorization string.
 *
 * TODO: Fix AuthScheme interface in the next major version
 *
 * @since 4.1
 */

public interface ContextAwareAuthScheme extends AuthScheme {

    /**
     * Produces an authorization string for the given set of
     * {@link Credentials}.
     *
     * @param credentials The set of credentials to be used for athentication
     * @param request The request being authenticated
     * @param context HTTP context
     * @throws AuthenticationException if authorization string cannot
     *   be generated due to an authentication failure
     *
     * @return the authorization string
     */
    Header authenticate(
            Credentials credentials,
            HttpRequest request,
            HttpContext context) throws AuthenticationException;

}