/*
    * Copyright 2008-2009 Web Cohesion
    *
    * 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
    *
    *   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 org.springframework.security.oauth.provider.attributes;
  
  import org.springframework.security.access.ConfigAttribute;
  import org.springframework.security.access.method.AbstractFallbackMethodSecurityMetadataSource;
  import org.springframework.core.annotation.AnnotationUtils;
  
  import java.util.Collection;
  import java.util.ArrayList;
  import java.util.List;
  import java.lang.reflect.Method;
  import java.lang.annotation.Annotation;
  
  /**
   * @author Ryan Heaton
   * @author Andrew McCall
   */
  public class ConsumerSecurityMetadataSource extends AbstractFallbackMethodSecurityMetadataSource {
  
    protected List<ConfigAttribute> findAttributes(Class<?> clazz) {
      return processAnnotations(clazz.getAnnotations());
    }
  
    protected List<ConfigAttribute> findAttributes(Method method, Class<?> targetClass) {
      return processAnnotations(AnnotationUtils.getAnnotations(method));
    }
  
    public Collection<ConfigAttribute> getAllConfigAttributes() {
      return null;
    }
  
    private List<ConfigAttribute> processAnnotations(Annotation[] annotations) {
      if (annotations == null || annotations.length == 0) {
        return null;
      }
      List<ConfigAttribute> attributes = new ArrayList<ConfigAttribute>();
  
      // Process DenyAll, Permit all, then Roles, then Keys
  
      for (Annotation a : annotations) {
        if (a instanceof DenyAllConsumers) {
          attributes.add(ConsumerSecurityConfig.DENY_ALL_ATTRIBUTE);
          return attributes;
        }
        if (a instanceof PermitAllConsumers) {
          attributes.add(ConsumerSecurityConfig.PERMIT_ALL_ATTRIBUTE);
          return attributes;
        }
        if (a instanceof ConsumerRolesAllowed) {
          ConsumerRolesAllowed ra = (ConsumerRolesAllowed) a;
          for (String role : ra.value()) {
            attributes.add(new ConsumerSecurityConfig(role, ConsumerSecurityConfig.ConsumerSecurityType.CONSUMER_ROLE));
          }
          return attributes;
        }
        if (a instanceof ConsumerKeysAllowed) {
          ConsumerKeysAllowed ka = (ConsumerKeysAllowed) a;
          for (String key : ka.value()) {
            attributes.add(new ConsumerSecurityConfig(key, ConsumerSecurityConfig.ConsumerSecurityType.CONSUMER_KEY));
          }
          return attributes;
        }
      }
      return null;
  
  
    }
  
  }