/*
* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
*
* 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.
*/
package org.springframework.security.web.access.channel;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.web.FilterInvocation;
import java.io.IOException;
import java.util.Collection;
import javax.servlet.ServletException;
/**
* Decides whether a web channel meets a specific security condition.
* <p>
* <code>ChannelProcessor</code> implementations are iterated by the
* {@link ChannelDecisionManagerImpl}.
* <p>
* If an implementation has an issue with the channel security, they should take action
* themselves. The callers of the implementation do not take any action.
*
* @author Ben Alex
*/
public interface ChannelProcessor {
// ~ Methods
// ========================================================================================================
/**
* Decided whether the presented {@link FilterInvocation} provides the appropriate
* level of channel security based on the requested list of <tt>ConfigAttribute</tt>s.
*
*/
void decide(FilterInvocation invocation, Collection<ConfigAttribute> config)
throws IOException, ServletException;
/**
* Indicates whether this <code>ChannelProcessor</code> is able to process the passed
* <code>ConfigAttribute</code>.
* <p>
* This allows the <code>ChannelProcessingFilter</code> to check every configuration
* attribute can be consumed by the configured <code>ChannelDecisionManager</code>.
*
* @param attribute a configuration attribute that has been configured against the
* <tt>ChannelProcessingFilter</tt>.
*
* @return true if this <code>ChannelProcessor</code> can support the passed
* configuration attribute
*/
boolean supports(ConfigAttribute attribute);
}