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/*
* 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.
*/
package org.apache.sling.commons.auth.spi;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* The AuthenticationHandler interface defines the service API used
* by the authentication implementation to support plugin various ways of
* extracting credentials from the request.
*
* @deprecated Use Apache Sling's org.apache.sling.auth.core.spi package instead.
*/
@Deprecated(since = "2015")
public interface AuthenticationHandler {
/**
* The name under which an implementation of this interface must be
* registered to be used as an authentication handler.
*/
static final String SERVICE_NAME = "org.apache.sling.commons.auth.spi.AuthenticationHandler";
/**
* The name of the service registration property listing one or more URL
* paths for which the authentication handler is to be used. The property
* may be a single string value or an array of strings or a Collection of
* strings.
*
* Each string value may either be an absolute path (e.g. /content) or an
* absolute URL (e.g. http://thehost/content) to assign the authentication
* handler to authenticate request for a select virtual host.
*
* Authentication handlers without a path service registration
* property are ignored.
*/
static final String PATH_PROPERTY = "path";
/**
* The name of the service registration property (single string) providing
* the authentication type of authentication handler. This is the same value
* as will be returned as the {@link AuthenticationInfo#getAuthType()
* authentication type} returned by the
* {@link #extractCredentials(HttpServletRequest, HttpServletResponse)}
* method.
*
*
* This property is optional but allows the client to optionally select the
* authentication handler which will actually request credentials upon the
* {@link #requestCredentials(HttpServletRequest, HttpServletResponse)}
* method.
*
* @see #REQUEST_LOGIN_PARAMETER
*/
static final String TYPE_PROPERTY = "authtype";
/**
* The request parameter which may be used to explicitly select an
* authentication handler by its {@link #TYPE_PROPERTY type} if
* authentication will be requested through
* {@link #requestCredentials(HttpServletRequest, HttpServletResponse)}.
*
* @see #requestCredentials(HttpServletRequest, HttpServletResponse)
* @see #TYPE_PROPERTY
*/
static final String REQUEST_LOGIN_PARAMETER = "sling:authRequestLogin";
/**
* Extracts credential data from the request if at all contained.
*
* The method returns any of the following values :
*
*
* value
* description
*
*
* null
* no user details were contained in the request or the handler is not
* capable or willing to extract credentials from the request
*
*
* {@link AuthenticationInfo#DOING_AUTH}
* the handler is in an ongoing authentication transaction with the
* client. Request processing should be aborted at this stage.
*
*
* {@link AuthenticationInfo#FAIL_AUTH}
* the handler failed extracting the credentials from the request for
* any reason. An example of this result is that credentials are present in
* the request but they could not be validated and thus not be used for
* request processing.
*
*
* AuthenticationInfo object
* The user sent credentials. The returned object contains the
* credentials as well as the type of authentication transmission employed.
*
*
*
* The method must not request credential information from the client, if
* they are not found in the request.
*
* The value of {@link #PATH_PROPERTY} service registration property value
* triggering this call is available as the path request
* attribute. If the service is registered with multiple path values, the
* value of the path request attribute may be used to implement
* specific handling.
*
* @param request The request object containing the information for the
* authentication.
* @param response The response object which may be used to send the
* information on the request failure to the user.
* @return A valid AuthenticationInfo instance identifying the
* request user, {@link AuthenticationInfo#DOING_AUTH} if the
* handler is in an authentication transaction with the client or
* null if the request does not contain authentication information.
* In case of {@link AuthenticationInfo#DOING_AUTH}, the method must
* have sent a response indicating that fact to the client.
*/
AuthenticationInfo extractCredentials(HttpServletRequest request, HttpServletResponse response);
/**
* Requests authentication information from the client. Returns
* true if the information has been requested and request
* processing can be terminated normally. Otherwise the authorization
* information could not be requested.
*
* The HttpServletResponse.sendError methods should not be used
* by the implementation because these responses might be post-processed by
* the servlet container's error handling infrastructure thus preventing the
* correct operation of the authentication handler. To convey a HTTP
* response status the HttpServletResponse.setStatus method
* should be used.
*
* The value of {@link #PATH_PROPERTY} service registration property value
* triggering this call is available as the path request
* attribute. If the service is registered with multiple path values, the
* value of the path request attribute may be used to implement
* specific handling.
*
* If the {@link #REQUEST_LOGIN_PARAMETER} request parameter is set only
* those authentication handlers registered with an {@link #TYPE_PROPERTY
* authentication type} matching the parameter will be considered for
* requesting credentials through this method.
*
* A handler not registered with an {@link #TYPE_PROPERTY authentication
* type} will, for backwards compatibility reasons, always be called
* ignoring the actual value of the {@link #REQUEST_LOGIN_PARAMETER}
* parameter.
*
* @param request The request object.
* @param response The response object to which to send the request.
* @return true if the handler is able to send an authentication
* inquiry for the given request. false otherwise.
* @throws IOException If an error occurrs sending the authentication
* inquiry to the client.
*/
boolean requestCredentials(HttpServletRequest request, HttpServletResponse response) throws IOException;
/**
* Drops any credential and authentication details from the request and asks
* the client to do the same.
*
* @param request The request object.
* @param response The response object to which to send the request.
* @throws IOException If an error occurrs asking the client to drop any
* authentication traces.
*/
void dropCredentials(HttpServletRequest request, HttpServletResponse response) throws IOException;
}