Combining custom annotations for securing methods with Spring Security (http://blog.novoj.net)

ExperimentalPrePostAnnotationSecurityMetadataSource.java

package cz.novoj.spring.security.aop;

import cz.novoj.spring.security.annotation.RulesRelation;
import cz.novoj.spring.security.annotation.RulesRelation.BooleanOperation;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.access.method.AbstractMethodSecurityMetadataSource;
import org.springframework.security.access.prepost.*;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;

import java.lang.Class;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

/**
 * Replacement for standard {@link PrePostAnnotationSecurityMetadataSource} that supports multiple different
 * custom security annotations that are combined into a single SPEL expression in a following way:
 * 
 * - all security rules placed upon method are by default combined with OR relation
 * - security rules placed upon method and the owning class are always combined with OR relation - meaning you
 *   can place global rule for all methods of the class (such as Admin always can call anything with any parameters) that
 *   override specific security rules placed on respective methods
 * - relation among rules at the same place (ie. annotations for single method, annotations for single class) can be
 *   changed by {@link @RulesRelation} annotation
 *
 * @author Jan Novotný (novotnaci@gmail.com)
 */
public class ExperimentalPrePostAnnotationSecurityMetadataSource extends AbstractMethodSecurityMetadataSource {
    private final PrePostInvocationAttributeFactory attributeFactory;

    public ExperimentalPrePostAnnotationSecurityMetadataSource(PrePostInvocationAttributeFactory attributeFactory) {
        this.attributeFactory = attributeFactory;
    }

    public Collection<ConfigAttribute> getAttributes(Method method, Class<?> targetClass) {
        if (method.getDeclaringClass() == Object.class) {
            return Collections.emptyList();
        }

        logger.trace("Looking for Pre/Post annotations for method '" +
                method.getName() + "' on target class '" + targetClass + "'");
        AnnotationGroupHolderTuple<PreFilter> preFilter = findAnnotation(method, targetClass, PreFilter.class);
        AnnotationGroupHolderTuple<PreAuthorize> preAuthorize = findAnnotation(method, targetClass, PreAuthorize.class);
        AnnotationGroupHolderTuple<PostFilter> postFilter = findAnnotation(method, targetClass, PostFilter.class);
        AnnotationGroupHolderTuple<PostAuthorize> postAuthorize = findAnnotation(method, targetClass, PostAuthorize.class);        

        if (!preFilter.hasValue() && !preAuthorize.hasValue() && !postFilter.hasValue() && !postAuthorize.hasValue() ) {
            // There is no meta-data so return
            logger.trace("No expression annotations found");
            return Collections.emptyList();
        }

        PreInvocationAttribute pre = getPreInvocationAttribute(preFilter, preAuthorize);
        PostInvocationAttribute post = getPostInvocationAttribute(postFilter, postAuthorize);

        ArrayList<ConfigAttribute> attrs = new ArrayList<ConfigAttribute>(2);        

        if (pre != null) {
            attrs.add(pre);
            logger.debug("Method " + targetClass + "#" + method.getName() + " will be checked before invocation: " + pre.getAttribute());
        }        

        if (post != null) {
            attrs.add(post);
            logger.debug("Method " + targetClass + "#" + method.getName() + " will be checked after invocation: " + pre.getAttribute());
        }

        attrs.trimToSize();

        return attrs;
    }

    /**
     * Composes PreInvocationAttribute from @PreFilter and @PreAuthorize annotations found on method and class level.
     * @param preFilter
     * @param preAuthorize
     * @return
     */
    private PreInvocationAttribute getPreInvocationAttribute(AnnotationGroupHolderTuple<PreFilter> preFilter, AnnotationGroupHolderTuple<PreAuthorize> preAuthorize) {
        String filterObject = null;
        StringBuilder preFilterAttribute = null;
        if (preFilter.hasValue()) {
            preFilterAttribute = new StringBuilder();   
            if (preFilter.getClassAnnotations().hasValue()) {
                preFilterAttribute.append("(");
                filterObject = composePreFilterAttribute(filterObject, preFilterAttribute, preFilter.getClassAnnotations());
                preFilterAttribute.append(")");
            }
            if (preFilterAttribute.length() > 0 && preFilter.getMethodAnnotations().hasValue()) {
                preFilterAttribute.append(" or ");
            }
            if (preFilter.getMethodAnnotations().hasValue()) {
                preFilterAttribute.append("(");
                filterObject = composePreFilterAttribute(filterObject, preFilterAttribute, preFilter.getMethodAnnotations());
                preFilterAttribute.append(")");
            }
        }

        StringBuilder preAuthorizeAttribute = null;
        if (preAuthorize.hasValue()) {
            preAuthorizeAttribute = new StringBuilder();
            if (preAuthorize.getClassAnnotations().hasValue()) {
                preAuthorizeAttribute.append("(");
                composePreAuthorizeAttribute(preAuthorizeAttribute, preAuthorize.getClassAnnotations());
                preAuthorizeAttribute.append(")");
            }
            if (preAuthorizeAttribute.length() > 0 && preAuthorize.getMethodAnnotations().hasValue()) {
                preAuthorizeAttribute.append(" or ");
            }
            if (preAuthorize.getMethodAnnotations().hasValue()) {
                preAuthorizeAttribute.append("(");
                composePreAuthorizeAttribute(preAuthorizeAttribute, preAuthorize.getMethodAnnotations());
                preAuthorizeAttribute.append(")");
            }
        }

        return attributeFactory.createPreInvocationAttribute(
                preFilterAttribute != null ? preFilterAttribute.toString() : null,
                filterObject,
                preAuthorizeAttribute != null ? preAuthorizeAttribute.toString() : null
        );
    }

    /**
     * Composes SPEL expression for @PreFilter annotation. Takes into account @RulesRelation annotation if defined for
     * relation composition.
     *
     * @param filterObject
     * @param preFilterAttribute
     * @param preFilterAnnotations
     * @return
     */
    private String composePreFilterAttribute(String filterObject, StringBuilder preFilterAttribute, AnnotationGroupHolder<PreFilter> preFilterAnnotations) {
        final List<PreFilter> annotations = preFilterAnnotations.getAnnotations();
        for (int i = 0; i < annotations.size(); i++) {
            PreFilter filter = annotations.get(i);
            if (filter.filterTarget() != null) {
                Assert.isTrue(filterObject == null || filterObject.equals(filter.filterTarget()), "Different filter target objects are not supported!");
                filterObject = filter.filterTarget();
            }
            preFilterAttribute.append("(").append(filter.value()).append(")");
            if (i < annotations.size() - 1) {
                if (preFilterAnnotations.getRelation() == BooleanOperation.OR) {
                    preFilterAttribute.append(" or ");
                } else {
                    preFilterAttribute.append(" and ");
                }
            }
        }
        return filterObject;
    }

    /**
     * Composes SPEL expression for @PreAuthorize annotation. Takes into account @RulesRelation annotation if defined for
     * relation composition.
     *
     * @param preAuthorizeAttribute
     * @param preAuthorizeAnnotations
     */
    private void composePreAuthorizeAttribute(StringBuilder preAuthorizeAttribute, AnnotationGroupHolder<PreAuthorize> preAuthorizeAnnotations) {
        final List<PreAuthorize> annotations = preAuthorizeAnnotations.getAnnotations();
        for (int i = 0; i < annotations.size(); i++) {
            PreAuthorize filter = annotations.get(i);            
            preAuthorizeAttribute.append("(").append(filter.value()).append(")");
            if (i < annotations.size() - 1) {
                if (preAuthorizeAnnotations.getRelation() == BooleanOperation.OR) {
                    preAuthorizeAttribute.append(" or ");
                } else {
                    preAuthorizeAttribute.append(" and ");
                }
            }
        }
    }

    /**
     * Composes PostInvocationAttribute from @PostFilter and @PostAuthorize annotations found on method and class level.
     * @param postFilter
     * @param postAuthorize
     * @return
     */
    private PostInvocationAttribute getPostInvocationAttribute(AnnotationGroupHolderTuple<PostFilter> postFilter, AnnotationGroupHolderTuple<PostAuthorize> postAuthorize) {
        StringBuilder postFilterAttribute = null;
        if (postFilter.hasValue()) {
            postFilterAttribute = new StringBuilder();
            if (postFilter.getClassAnnotations().hasValue()) {
                postFilterAttribute.append("(");
                composePostFilterAttribute(postFilterAttribute, postFilter.getClassAnnotations());
                postFilterAttribute.append(")");
            }
            if (postFilterAttribute.length() > 0 && postFilter.getMethodAnnotations().hasValue()) {
                postFilterAttribute.append(" or ");
            }
            if (postFilter.getMethodAnnotations().hasValue()) {
                postFilterAttribute.append("(");
                composePostFilterAttribute(postFilterAttribute, postFilter.getMethodAnnotations());
                postFilterAttribute.append(")");
            }
        }

        StringBuilder postAuthorizeAttribute = null;
        if (postAuthorize.hasValue()) {
            postAuthorizeAttribute = new StringBuilder();
            if (postAuthorize.getClassAnnotations().hasValue()) {
                postAuthorizeAttribute.append("(");
                composePostAuthorizeAttribute(postAuthorizeAttribute, postAuthorize.getClassAnnotations());
                postAuthorizeAttribute.append(")");
            }
            if (postAuthorizeAttribute.length() > 0 && postAuthorize.getMethodAnnotations().hasValue()) {
                postAuthorizeAttribute.append(" or ");
            }
            if (postAuthorize.getMethodAnnotations().hasValue()) {
                postAuthorizeAttribute.append("(");
                composePostAuthorizeAttribute(postAuthorizeAttribute, postAuthorize.getMethodAnnotations());
                postAuthorizeAttribute.append(")");
            }
        }
        return attributeFactory.createPostInvocationAttribute(
                postFilterAttribute != null ? postFilterAttribute.toString() : null,
                postAuthorizeAttribute != null ? postAuthorizeAttribute.toString() : null
        );
    }

    /**
     * Composes SPEL expression for @PostFilter annotation. Takes into account @RulesRelation annotation if defined for
     * relation composition.
     *
     * @param postFilterAttribute
     * @param postFilterAnnotations
     */
    private void composePostFilterAttribute(StringBuilder postFilterAttribute, AnnotationGroupHolder<PostFilter> postFilterAnnotations) {
        final List<PostFilter> annotations = postFilterAnnotations.getAnnotations();
        for (int i = 0; i < annotations.size(); i++) {
            PostFilter filter = annotations.get(i);
            postFilterAttribute.append("(").append(filter.value()).append(")");
            if (i < annotations.size() - 1) {
                if (postFilterAnnotations.getRelation() == BooleanOperation.OR) {
                    postFilterAttribute.append(" or ");
                } else {
                    postFilterAttribute.append(" and ");
                }
            }
        }
    }

    /**
     * Composes SPEL expression for @PostAuthorize annotation. Takes into account @RulesRelation annotation if defined for
     * relation composition.
     *
     * @param postAuthorizeAttribute
     * @param postAuthorizeAnnotations
     */
    private void composePostAuthorizeAttribute(StringBuilder postAuthorizeAttribute, AnnotationGroupHolder<PostAuthorize> postAuthorizeAnnotations) {
        final List<PostAuthorize> annotations = postAuthorizeAnnotations.getAnnotations();
        for (int i = 0; i < annotations.size(); i++) {
            PostAuthorize filter = annotations.get(i);
            postAuthorizeAttribute.append("(").append(filter.value()).append(")");
            if (i < annotations.size() - 1) {
                if (postAuthorizeAnnotations.getRelation() == BooleanOperation.OR) {
                    postAuthorizeAttribute.append(" or ");
                } else {
                    postAuthorizeAttribute.append(" and ");
                }
            }
        }
    }

    public Collection<ConfigAttribute> getAllConfigAttributes() {
        return null;
    }

    /**
     * This method finds a particular annotation on method or class level. It uses following schema:
     * 1) tries to find annotations on specific method {@link ClassUtils#getMostSpecificMethod(Method, Class<?>)}
     * 2) tries to find annotations on passed method (if differs from specific one)
     * 3) tries to find annotations on class level
     *
     * This method differs from the former Spring Security behaviour so that if finds ALL annotations of the passed
     * kind. Ie. when you have multiple custom annotations placed on the method / class and all these annotations are
     * annotated with fe. @PreAuthorize annotation, all these annotations are found and combined together into
     * the AnnotationGroupHolderTuple.
     *
     * Lookup doesn't finish when annotations are found on the method level, but class is examined always too. Return
     * object always hold both results - method and class annotations together.
     */
    private <A  extends Annotation> AnnotationGroupHolderTuple<A> findAnnotation(Method method, Class<?> targetClass, Class<A> annotationClass) {
        // The method may be on an interface, but we need attributes from the target class.
        // If the target class is null, the method will be unchanged.
        Method specificMethod = ClassUtils.getMostSpecificMethod(method, targetClass);
        List<A> methodAnnotation = ExtendedAnnotationUtils.findAnnotation(specificMethod, annotationClass);
        RulesRelation methodAnnotationRelation = AnnotationUtils.findAnnotation(specificMethod, RulesRelation.class);        

        if (methodAnnotation != null) {
            logger.debug(methodAnnotation + " found on specific method: " + specificMethod);
        } else {
            // Check the original (e.g. interface) method
            if (specificMethod != method) {
                methodAnnotation = ExtendedAnnotationUtils.findAnnotation(method, annotationClass);
                methodAnnotationRelation = AnnotationUtils.findAnnotation(method, RulesRelation.class);
                if (methodAnnotation != null) {
                    logger.debug(methodAnnotation + " found on: " + method);                    
                }
            }
        }

        // Check the class-level (note declaringClass, not targetClass, which may not actually implement the method)
        List<A> classAnnotation = ExtendedAnnotationUtils.findAnnotation(specificMethod.getDeclaringClass(), annotationClass);
        RulesRelation classAnnotationRelation = AnnotationUtils.findAnnotation(specificMethod.getDeclaringClass(), RulesRelation.class);
        if (classAnnotation != null) {
            logger.debug(classAnnotation + " found on: " + specificMethod.getDeclaringClass().getName());
        }

        return new AnnotationGroupHolderTuple<A>(
                new AnnotationGroupHolder<A>(classAnnotation, classAnnotationRelation != null ? classAnnotationRelation.value() : BooleanOperation.OR),
                new AnnotationGroupHolder<A>(methodAnnotation, methodAnnotationRelation != null ? methodAnnotationRelation.value() : BooleanOperation.OR)
        );
    }

    /**
     * Simple DTO for transferring found annotations on class and method level along with related @RulesRelation annotation value.
     * @param <A>
     */
    private static class AnnotationGroupHolderTuple<A> {
        private final AnnotationGroupHolder<A> classAnnotations;
        private final AnnotationGroupHolder<A> methodAnnotations;

        private AnnotationGroupHolderTuple(AnnotationGroupHolder<A> classAnnotations, AnnotationGroupHolder<A> methodAnnotations) {
            this.classAnnotations = classAnnotations;
            this.methodAnnotations = methodAnnotations;
        }

        public boolean hasValue() {
            return classAnnotations.hasValue() || methodAnnotations.hasValue();
        }

        public AnnotationGroupHolder<A> getClassAnnotations() {
            return classAnnotations;
        }

        public AnnotationGroupHolder<A> getMethodAnnotations() {
            return methodAnnotations;
        }
    }

    /**
     * Simple DTO for transferring found annotations and @RulesRelation annotation value.
     * @param <A>
     */
    private static class AnnotationGroupHolder<A> {
        private final List<A> annotations;
        private final BooleanOperation relation;

        private AnnotationGroupHolder(List<A> annotations, BooleanOperation relation) {
            this.annotations = annotations;
            this.relation = relation;
        }
        
        public boolean hasValue() {
            return annotations != null && !annotations.isEmpty();
        }

        public List<A> getAnnotations() {
            return annotations;
        }

        public BooleanOperation getRelation() {
            return relation;
        }
    }

}

ExtendedAnnotationUtils.java

package cz.novoj.spring.security.aop;

import org.springframework.core.BridgeMethodResolver;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.util.Assert;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;

/**
 * Alteration of the base Spring methods in {@link AnnotationUtils} with small change allowing to find multiple annotations
 * instead of first one.
 *
 * @author Jan Novotný (novotnaci@gmail.com)
 */
public abstract class ExtendedAnnotationUtils {
    private static final Map<Class, Boolean> annotatedInterfaceCache = new WeakHashMap<Class, Boolean>();    

    /**
     * Returns all annotations that are exactly instance of passed type or multiple custom annotations that are
     * itself annotated with passed annotationType.
     *
     * Slightly modified copy of:
     *
     * @see AnnotationUtils#getAnnotation(java.lang.reflect.Method, Class)
     */
    public static <A extends Annotation> List<A> getAnnotation(Method method, Class<A> annotationType) {
        Method resolvedMethod = BridgeMethodResolver.findBridgedMethod(method);
        List<A> result = new ArrayList<A>();
        A ann = resolvedMethod.getAnnotation(annotationType);
        if (ann != null) {
            result.add(ann);
        }
        for (Annotation metaAnn : resolvedMethod.getAnnotations()) {
            ann = metaAnn.annotationType().getAnnotation(annotationType);
            if (ann != null) {
                result.add(ann);
            }
        }        
        return result.isEmpty() ? null : result;
    }

    /**
     * Returns all annotations that are exactly instance of passed type or multiple custom annotations that are
     * itself annotated with passed annotationType.
     *
     * Slightly modified copy of:
     *
     * @see AnnotationUtils#findAnnotation(java.lang.reflect.Method, Class)
     */
    public static <A extends Annotation> List<A> findAnnotation(Method method, Class<A> annotationType) {
        List<A> annotation = getAnnotation(method, annotationType);
        Class<?> cl = method.getDeclaringClass();
        if (annotation == null) {
            annotation = searchOnInterfaces(method, annotationType, cl.getInterfaces());
        }
        while (annotation == null) {
            cl = cl.getSuperclass();
            if (cl == null || cl == Object.class) {
                break;
            }
            try {
                Method equivalentMethod = cl.getDeclaredMethod(method.getName(), method.getParameterTypes());
                annotation = getAnnotation(equivalentMethod, annotationType);
                if (annotation == null) {
                    annotation = searchOnInterfaces(method, annotationType, cl.getInterfaces());
                }
            }
            catch (NoSuchMethodException ex) {
                // We're done...
            }
        }
        return annotation;
    }

    /**
     * Returns all annotations that are exactly instance of passed type or multiple custom annotations that are
     * itself annotated with passed annotationType.
     *
     * Slightly modified copy of:
     *
     * @see AnnotationUtils#getAnnotation(java.lang.reflect.Method, Class)
     */
    public static <A extends Annotation> List<A> getAnnotation(Class<?> clazz, Class<A> annotationType) {        
        List<A> result = new ArrayList<A>();
        A ann = clazz.getAnnotation(annotationType);
        if (ann != null) {
            result.add(ann);
        }
        for (Annotation metaAnn : clazz.getAnnotations()) {
            ann = metaAnn.annotationType().getAnnotation(annotationType);
            if (ann != null) {
                result.add(ann);
            }
        }
        return result.isEmpty() ? null : result;
    }

    /**
     * Returns all annotations that are exactly instance of passed type or multiple custom annotations that are
     * itself annotated with passed annotationType.
     *
     * Slightly modified copy of:
     *
     * @see AnnotationUtils#findAnnotation(Class, Class)
     */
    public static <A extends Annotation> List<A> findAnnotation(Class<?> clazz, Class<A> annotationType) {
        Assert.notNull(clazz, "Class must not be null");
        List<A> annotation = getAnnotation(clazz, annotationType);
        if (annotation != null) {
            return annotation;
        }
        for (Class<?> ifc : clazz.getInterfaces()) {
            annotation = findAnnotation(ifc, annotationType);
            if (annotation != null) {
                return annotation;
            }
        }
        Class<?> superClass = clazz.getSuperclass();
        if (superClass == null || superClass == Object.class) {
            return null;
        }
        return findAnnotation(superClass, annotationType);
    }

    private static <A extends Annotation> List<A> searchOnInterfaces(Method method, Class<A> annotationType, Class[] ifcs) {
        List<A> annotation = null;
        for (Class<?> iface : ifcs) {
            if (isInterfaceWithAnnotatedMethods(iface)) {
                try {
                    Method equivalentMethod = iface.getMethod(method.getName(), method.getParameterTypes());
                    annotation = getAnnotation(equivalentMethod, annotationType);
                }
                catch (NoSuchMethodException ex) {
                    // Skip this interface - it doesn't have the method...
                }
                if (annotation != null) {
                    break;
                }
            }
        }
        return annotation;
    }

    private static boolean isInterfaceWithAnnotatedMethods(Class<?> iface) {
        synchronized (annotatedInterfaceCache) {
            Boolean flag = annotatedInterfaceCache.get(iface);
            if (flag != null) {
                return flag;
            }
            boolean found = false;
            for (Method ifcMethod : iface.getMethods()) {
                if (ifcMethod.getAnnotations().length > 0) {
                    found = true;
                    break;
                }
            }
            annotatedInterfaceCache.put(iface, found);
            return found;
        }
    }
    
}

RulesRelation.java

package cz.novoj.spring.security.annotation;

import java.lang.annotation.*;

/**
 * Directly specifies form of relation among different custom security annotations at the same place (ie. single method,
 * single class).
 *
 * @author Jan Novotný (novotnaci@gmail.com)
 */
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Documented
public @interface RulesRelation {
    enum BooleanOperation { OR, AND }
    
    BooleanOperation value() default BooleanOperation.OR;
    
}

spring-method-security.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

    <aop:config proxy-target-class="true">
        <aop:advisor advice-ref="experimentalMethodSecurityInterceptor"
                     pointcut="execution(@(@org.springframework.security.access.prepost.PreAuthorize *) * *.* (..))"/>
        <aop:advisor advice-ref="experimentalMethodSecurityInterceptor"
                     pointcut="execution(@(@org.springframework.security.access.prepost.PreFilter *) * *.* (..))"/>
        <aop:advisor advice-ref="experimentalMethodSecurityInterceptor"
                     pointcut="execution(@(@org.springframework.security.access.prepost.PostAuthorize *) * *.* (..))"/>
        <aop:advisor advice-ref="experimentalMethodSecurityInterceptor"
                     pointcut="execution(@(@org.springframework.security.access.prepost.PostFilter *) * *.* (..))"/>
    </aop:config>

    <!-- Configure custom security interceptor -->
    <bean id="experimentalMethodSecurityInterceptor"
          class="org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor">
        <property name="securityMetadataSource">
            <bean class="cz.novoj.spring.security.aop.ExperimentalPrePostAnnotationSecurityMetadataSource">
                <constructor-arg>
                    <bean class="org.springframework.security.access.expression.method.ExpressionBasedAnnotationAttributeFactory">
                        <constructor-arg ref="expressionHandler"/>
                    </bean>
                </constructor-arg>
            </bean>
        </property>
        <property name="authenticationManager" ref="authenticationManager"/>
        <property name="validateConfigAttributes" value="false"/>
        <property name="accessDecisionManager">
            <bean class="org.springframework.security.access.vote.AffirmativeBased">
                <constructor-arg>
                    <list>
                        <bean class="org.springframework.security.access.prepost.PreInvocationAuthorizationAdviceVoter">
                            <constructor-arg>
                                <bean class="org.springframework.security.access.expression.method.ExpressionBasedPreInvocationAdvice">
                                    <property name="expressionHandler" ref="expressionHandler"/>
                                </bean>
                            </constructor-arg>
                        </bean>
                    </list>
                </constructor-arg>
            </bean>
        </property>
    </bean>

    <bean id="expressionHandler"
          class="org.springframework.security.access.expression.method.DefaultMethodSecurityExpressionHandler"/>

</beans>

I am very much interested in this project. Can you please share your code as a github project please.

for those searching the blog post to this gist: http://blog.novoj.net/2012/03/27/combining-custom-annotations-for-securing-methods-with-spring-security/ :)