/*
* Copyright 2010 the original author or authors.
*
* 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.util.matcher;
import javax.servlet.http.HttpServletRequest;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.security.web.authentication.DelegatingAuthenticationEntryPoint;
import org.springframework.security.web.util.matcher.RequestMatcher;
/**
* A RequestMatcher implementation which uses a SpEL expression
*
* <p>With the default EvaluationContext ({@link ELRequestMatcherContext}) you can use
* <code>hasIpAdress()</code> and <code>hasHeader()</code></p>
*
* <p>See {@link DelegatingAuthenticationEntryPoint} for an example configuration.</p>
*
*
* @author Mike Wiesner
* @since 3.0.2
*/
public class ELRequestMatcher implements RequestMatcher {
private final Expression expression;
public ELRequestMatcher(String el) {
SpelExpressionParser parser = new SpelExpressionParser();
expression = parser.parseExpression(el);
}
public boolean matches(HttpServletRequest request) {
EvaluationContext context = createELContext(request);
return expression.getValue(context, Boolean.class).booleanValue();
}
/**
* Subclasses can override this methode if they want to use a different EL root context
*
* @return EL root context which is used to evaluate the expression
*/
public EvaluationContext createELContext(HttpServletRequest request) {
return new StandardEvaluationContext(new ELRequestMatcherContext(request));
}
}