/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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
 *
 *    https://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 grails.plugin.springsecurity.acl.access.method

import java.lang.annotation.Annotation
import java.lang.reflect.Method

import groovy.transform.CompileStatic

import org.springframework.security.access.ConfigAttribute
import org.springframework.security.access.SecurityConfig
import org.springframework.security.access.method.AbstractFallbackMethodSecurityMetadataSource

import grails.plugin.springsecurity.acl.util.ProxyUtils
import grails.plugin.springsecurity.annotation.Secured

/**
 * Based on the Spring Security class of the same name but supports the plugin's @Secured annotation
 * which can be applied on fields to support annotated controller actions.
 *
 * @author <a href='mailto:burt@burtbeckwith.com'>Burt Beckwith</a>
 */
@CompileStatic
class SecuredAnnotationSecurityMetadataSource extends AbstractFallbackMethodSecurityMetadataSource {

    protected Collection<String> serviceClassNames

    @Override
    protected Collection<ConfigAttribute> findAttributes(Class<?> clazz) {
        Class<?> actualClass = ProxyUtils.unproxy(clazz)
        if (isService(actualClass)) {
            return processAnnotation(actualClass.getAnnotation(Secured))
        }
    }

    @Override
    protected Collection<ConfigAttribute> findAttributes(Method method, Class<?> targetClass) {
        Method actualMethod = ProxyUtils.unproxy(method)
        if (isService(actualMethod.declaringClass)) {
            return processAnnotation(actualMethod.getAnnotation(Secured))
        }
    }

    Collection<ConfigAttribute> getAllConfigAttributes() {}

    protected List<ConfigAttribute> processAnnotation(Annotation a) {
        if (a instanceof Secured) {
            a.value().collect { String token -> ((ConfigAttribute) new SecurityConfig(token)) }
        }
    }

    protected boolean isService(Class<?> clazz) {
        serviceClassNames.any { String name -> name == clazz.name }
    }

    /**
     * Dependency injection for current service class names.
     * @param names the names
     */
    void setServiceClassNames(Collection<String> names) {
        serviceClassNames = names
    }
}
