/*
 * 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;

import org.springframework.security.core.Authentication;

/**
 * Allows users to determine whether they have privileges for a given web URI.
 *
 * @author Luke Taylor
 * @since 3.0
 */
public interface WebInvocationPrivilegeEvaluator {

	/**
	 * Determines whether the user represented by the supplied <tt>Authentication</tt>
	 * object is allowed to invoke the supplied URI.
	 *
	 * @param uri the URI excluding the context path (a default context path setting will
	 * be used)
	 */
	public boolean isAllowed(String uri, Authentication authentication);

	/**
	 * Determines whether the user represented by the supplied <tt>Authentication</tt>
	 * object is allowed to invoke the supplied URI, with the given .
	 * <p>
	 * Note the default implementation of <tt>FilterInvocationSecurityMetadataSource</tt>
	 * disregards the <code>contextPath</code> when evaluating which secure object
	 * metadata applies to a given request URI, so generally the <code>contextPath</code>
	 * is unimportant unless you are using a custom
	 * <code>FilterInvocationSecurityMetadataSource</code>.
	 *
	 * @param uri the URI excluding the context path
	 * @param contextPath the context path (may be null).
	 * @param method the HTTP method (or null, for any method)
	 * @param authentication the <tt>Authentication</tt> instance whose authorities should
	 * be used in evaluation whether access should be granted.
	 * @return true if access is allowed, false if denied
	 */
	public boolean isAllowed(String contextPath, String uri, String method,
			Authentication authentication);
}
