GlobalMethodSecuritySelector.java

/*
 * Copyright 2002-2013 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.config.annotation.method.configuration;

import java.util.Map;

import org.springframework.context.annotation.AdviceMode;
import org.springframework.context.annotation.AutoProxyRegistrar;
import org.springframework.context.annotation.ImportSelector;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;

/**
 * Dynamically determines which imports to include using the
 * {@link EnableGlobalMethodSecurity} annotation.
 *
 * @author Rob Winch
 * @since 3.2
 */
final class GlobalMethodSecuritySelector implements ImportSelector {

    @Override
    public final String[] selectImports(AnnotationMetadata importingClassMetadata) {
        Class<EnableGlobalMethodSecurity> annoType = EnableGlobalMethodSecurity.class;
        Map<String, Object> annotationAttributes = importingClassMetadata.getAnnotationAttributes(annoType.getName(), false);
        AnnotationAttributes attributes = AnnotationAttributes.fromMap(annotationAttributes);
        Assert.notNull(attributes, String.format(
                "@%s is not present on importing class '%s' as expected",
                annoType.getSimpleName(), importingClassMetadata.getClassName()));

        // TODO would be nice if could use BeanClassLoaderAware (does not work)
        Class<?> importingClass = ClassUtils.resolveClassName(importingClassMetadata.getClassName(), ClassUtils.getDefaultClassLoader());
        boolean skipMethodSecurityConfiguration = GlobalMethodSecurityConfiguration.class.isAssignableFrom(importingClass);

        AdviceMode mode = attributes.getEnum("mode");
        String autoProxyClassName = AdviceMode.PROXY == mode ? AutoProxyRegistrar.class.getName()
                : GlobalMethodSecurityAspectJAutoProxyRegistrar.class.getName();
        if(skipMethodSecurityConfiguration) {
            return new String[] { autoProxyClassName };
        }
        return new String[] { autoProxyClassName,
                GlobalMethodSecurityConfiguration.class.getName()};
    }
}