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/*
 * $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/auth/AuthScheme.java,v 1.4.2.2 2004/02/22 18:21:14 olegk Exp $
 * $Revision: 1.4.2.2 $
 * $Date: 2004/02/22 18:21:14 $
 *
 * ====================================================================
 *
 *  Copyright 2002-2004 The Apache Software Foundation
 *
 *  Licensed 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
 * .
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */

package org.apache.commons.httpclient.auth;

import org.apache.commons.httpclient.Credentials;

/**
 * 

* This interface represents an abstract authentication scheme. *

*

* An authentication scheme should be able to support the following * functions: *

    *
  • Provide its textual designation *
  • Provide its parameters, if available *
  • Provide the realm this authentication scheme is applicable to, * if available *
  • Generate authorization string for the given set of credentials, * request method and URI as specificed in the HTTP request line *
*

*

* Authentication schemes may ignore method name and URI parameters * if they are not relevant for the given authentication mechanism *

* * @author Oleg Kalnichevski * @author Adrian Sutton * * @since 2.0beta1 */ public interface AuthScheme { /** * Returns textual designation of the given authentication scheme. * * @return the name of the given authentication scheme */ String getSchemeName(); /** * Returns authentication parameter with the given name, if available. * * @param name The name of the parameter to be returned * * @return the parameter with the given name */ String getParameter(final String name); /** * Returns authentication realm. If the concept of an authentication * realm is not applicable to the given authentication scheme, returns * null. * * @return the authentication realm */ String getRealm(); /** * Returns a String identifying the authentication challenge. This is * used, in combination with the host and port to determine if * authorization has already been attempted or not. Schemes which * require multiple requests to complete the authentication should * return a different value for each stage in the request. * *

Additionally, the ID should take into account any changes to the * authentication challenge and return a different value when appropriate. * For example when the realm changes in basic authentication it should be * considered a different authentication attempt and a different value should * be returned.

* * @return String a String identifying the authentication challenge. The * returned value may be null. */ String getID(); /** * Produces an authorization string for the given set of {@link Credentials}, * method name and URI using the given authentication scheme. * * @param credentials The set of credentials to be used for athentication * @param method The name of the method that requires authorization. * This parameter may be ignored, if it is irrelevant * or not applicable to the given authentication scheme * @param uri The URI for which authorization is needed. * This parameter may be ignored, if it is irrelevant or not * applicable to the given authentication scheme * @throws AuthenticationException if authorization string cannot * be generated due to an authentication failure * * @return the authorization string * * @see org.apache.commons.httpclient.HttpMethod#getName() * @see org.apache.commons.httpclient.HttpMethod#getPath() */ String authenticate(Credentials credentials, String method, String uri) throws AuthenticationException; }


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