com.gradecak.alfresco.mvc.aop.RunAsAdvice.java Source code

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Here is the source code for com.gradecak.alfresco.mvc.aop.RunAsAdvice.java

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/**
 * Copyright gradecak.com
    
 * 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 com.gradecak.alfresco.mvc.aop;

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

import org.alfresco.repo.security.authentication.AuthenticationUtil;
import org.alfresco.repo.security.authentication.AuthenticationUtil.RunAsWork;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.core.BridgeMethodResolver;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringUtils;

import com.gradecak.alfresco.mvc.annotation.AlfrescoRunAs;

public class RunAsAdvice implements MethodInterceptor {

    public Object invoke(final MethodInvocation invocation) throws Throwable {

        Class<?> targetClass = invocation.getThis() != null ? invocation.getThis().getClass() : null;

        Method specificMethod = ClassUtils.getMostSpecificMethod(invocation.getMethod(), targetClass);
        // If we are dealing with method with generic parameters, find the original
        // method.
        specificMethod = BridgeMethodResolver.findBridgedMethod(specificMethod);
        AlfrescoRunAs alfrescounRunAs = parseRunAsAnnotation(specificMethod);
        if (alfrescounRunAs != null) {
            String runAs = alfrescounRunAs.value();
            if (StringUtils.hasText(runAs)) {
                RunAsWork<Object> getUserNameRunAsWork = new RunAsWork<Object>() {
                    public Object doWork() throws Exception {
                        try {
                            return invocation.proceed();
                        } catch (Throwable e) {
                            throw new Exception(e.getMessage(), e);
                        }
                    }
                };
                return AuthenticationUtil.runAs(getUserNameRunAsWork, runAs);
            }
        }

        return invocation.proceed();
    }

    private AlfrescoRunAs parseRunAsAnnotation(AnnotatedElement ae) {
        AlfrescoRunAs ann = ae.getAnnotation(AlfrescoRunAs.class);
        if (ann == null) {
            for (Annotation metaAnn : ae.getAnnotations()) {
                ann = metaAnn.annotationType().getAnnotation(AlfrescoRunAs.class);
                if (ann != null) {
                    break;
                }
            }
        }
        if (ann != null) {
            return parseAnnotation(ann);
        } else {
            return null;
        }
    }

    private AlfrescoRunAs parseAnnotation(AlfrescoRunAs ann) {
        // parse if needed something else
        return ann;
    }

}