/*
 * Copyright 2005-2008 Les Hazlewood
 *
 * 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.jsecurity.spring.security.interceptor;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jsecurity.authz.annotation.RequiresPermissions;
import org.jsecurity.authz.annotation.RequiresRoles;
import org.jsecurity.mgt.SecurityManager;
import org.springframework.aop.support.StaticMethodMatcherPointcutAdvisor;
import org.springframework.beans.factory.InitializingBean;

import java.lang.reflect.Method;

/**
 * @since 0.1
 * @author Les Hazlewood
 */
public class AuthorizationAttributeSourceAdvisor extends StaticMethodMatcherPointcutAdvisor
        implements InitializingBean {

    protected transient final Log log = LogFactory.getLog( getClass() );

    protected SecurityManager securityManager = null;

    /**
     * Create a new AuthorizationAttributeSourceAdvisor.
     */
    public AuthorizationAttributeSourceAdvisor() {
    }

    public org.jsecurity.mgt.SecurityManager getSecurityManager() {
        return securityManager;
    }

    public void setSecurityManager(SecurityManager securityManager) {
        this.securityManager = securityManager;
    }

    /**
     * Returns <tt>true</tt> if the method has a JSecurity <tt>RequiresRoles</tt> or
     * <tt>RequiresPermissions</tt> annotation, false otherwise.
     * @param method the method to check for a JSecurity annotation
     * @param targetClass the class potentially declaring JSecurity annotations
     * @return <tt>true</tt> if the method has a JSecurity <tt>RequiresRoles</tt> or
     * <tt>RequiresPermissions</tt> annotation, false otherwise.
     * @see org.jsecurity.authz.annotation.RequiresRoles
     * @see org.jsecurity.authz.annotation.RequiresPermissions
     * @see org.springframework.aop.MethodMatcher#matches(java.lang.reflect.Method, Class)
     */
    public boolean matches( Method method, Class targetClass) {
        return ( (method.getAnnotation( RequiresPermissions.class ) != null ) ||
                 (method.getAnnotation( RequiresRoles.class ) != null ) );
    }

    public void afterPropertiesSet() throws Exception {
        if ( getSecurityManager() == null ) {
            String msg = "SecurityManager property must be set";
            throw new IllegalStateException( msg );
        }
        if( getAdvice() == null ) {
            if ( log.isTraceEnabled() ) {
                log.trace( "No authorization advice explicitly configured via the 'advice' " +
                        "property.  Attempting to set " +
                        "default instance of type [" +
                        AopAllianceAnnotationsAuthorizingMethodInterceptor.class.getName() + "]");
            }
            AopAllianceAnnotationsAuthorizingMethodInterceptor interceptor = new AopAllianceAnnotationsAuthorizingMethodInterceptor();
            interceptor.setSecurityManager( getSecurityManager() );
            interceptor.init();

            setAdvice( interceptor );
        }
    }
}