content: /**
   * 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
   *
   *   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.apache.aries.blueprint.authorization.impl;
  
  import java.lang.annotation.Annotation;
  import java.lang.reflect.AnnotatedElement;
  import java.lang.reflect.Method;
  import javax.annotation.security.DenyAll;
  import javax.annotation.security.PermitAll;
  import javax.annotation.security.RolesAllowed;
  
  /**
   * Evaluates JEE security annotations 
   * @see PermitAll
   * @see DenyAll
   * @see RolesAllowed
   */
  class SecurityAnotationParser {
  
      /**
       * Get the effective annotation regarding method annotations override class annotations.
       * DenyAll has highest priority then RolesAllowed and in the end PermitAll. 
       * So the most restrictive annotation is preferred.
       * 
       * @param m Method to check
       * @return effective annotation (either DenyAll, PermitAll or RolesAllowed)
       */
      Annotation getEffectiveAnnotation(Class<?> beanClass, Method m) {
          Annotation classLevel = getAuthAnnotation(beanClass);
          try {
              Method beanMethod = beanClass.getMethod(m.getName(), m.getParameterTypes());
              Annotation methodLevel = getAuthAnnotation(beanMethod);
              return (methodLevel != null) ? methodLevel : classLevel;
          } catch (Exception e) {
              throw new IllegalStateException(e);
          }
      }
  
      private Annotation getAuthAnnotation(AnnotatedElement element) {
          Annotation ann = null;
          ann = element.getAnnotation(DenyAll.class);
          if (ann == null) {
              ann = element.getAnnotation(RolesAllowed.class);
          }
          if (ann == null) {
              ann = element.getAnnotation(PermitAll.class);
          }
          return ann;
      }
  
      /**
       * A class is secured if either the class or one of its methods is secured.
       * An AnnotatedElement is secured if @RolesAllowed or @DenyAll is present.
       * 
       * @param clazz
       * @return
       */
      public boolean isSecured(Class<?> clazz) {
          if (clazz == Object.class) {
              return false;
          }
          if (isSecuredEl(clazz)) {
              return true;
          }
          for (Method m : clazz.getMethods()) {
              if (isSecuredEl(m)) {
                  return true;
              }
  
          }
          return false;
      }
      
      private boolean isSecuredEl(AnnotatedElement element) {
          return element.isAnnotationPresent(RolesAllowed.class) || element.isAnnotationPresent(DenyAll.class); 
      }
  
  }
  