/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/kernel/trunk/api/src/main/java/org/sakaiproject/entity/api/HttpAccess.java $
* $Id: HttpAccess.java 105077 2012-02-24 22:54:29Z ottenhoff@longsight.com $
***********************************************************************************
*
* Copyright (c) 2005, 2006, 2008 Sakai Foundation
*
* Licensed under the Educational Community 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.opensource.org/licenses/ECL-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.sakaiproject.entity.api;
import java.util.Collection;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* <p>
* Provide entity access via http for use in the access servlet.
* </p>
*/
public interface HttpAccess
{
/**
* Handle an HTTP request for access. The request and response objects are provider.<br />
* The access is for the referenced entity.<br />
* Use the response object to send the headers, length, content type, and bytes of the response in whatever manner needed.<br />
* Make the response ONLY if it is permitted and exists and otherwise valid. Use the exceptions for any error handling.
*
* @param req
* The request object.
* @param res
* The response object.
* @param ref
* The entity reference
* @param copyrightAcceptedRefs
* The collection (entity reference String) of entities that the end user in this session have already accepted the copyright for.
* @throws EntityPermissionException
* Throw this if the current user does not have permission for the access.
* @throws EntityNotDefinedException
* Throw this if the ref is not supported or the entity is not available for access in any way.
* @throws EntityAccessOverloadException
* Throw this if you are rejecting an otherwise valid request because of some sort of server resource shortage or limit.
* @throws EntityCopyrightException
* Throw this if you are rejecting an otherwise valid request because the user needs to agree to the copyright and has not yet done so.
*/
void handleAccess(HttpServletRequest req, HttpServletResponse res, Reference ref, Collection<String> copyrightAcceptedRefs)
throws EntityPermissionException, EntityNotDefinedException, EntityAccessOverloadException, EntityCopyrightException;
}