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.causeway.extensions.secman.delegated.shiro.util;
  
  import java.util.Collection;
  
  import org.apache.shiro.SecurityUtils;
  import org.apache.shiro.UnavailableSecurityManagerException;
  import org.apache.shiro.authc.AuthenticationException;
  import org.apache.shiro.mgt.RealmSecurityManager;
  import org.apache.shiro.realm.Realm;
  
  import org.apache.causeway.extensions.secman.delegated.shiro.realm.CausewayModuleExtSecmanShiroRealm;
  
  import lombok.experimental.UtilityClass;
  
  /**
   * @since 2.0 {@index}
   */
  @UtilityClass
  public class ShiroUtils {
  
      public static synchronized RealmSecurityManager getSecurityManager() {
          org.apache.shiro.mgt.SecurityManager securityManager;
          try {
              securityManager = SecurityUtils.getSecurityManager();
          } catch(UnavailableSecurityManagerException ex) {
              throw new AuthenticationException(ex);
          }
          if(!(securityManager instanceof RealmSecurityManager)) {
              throw new AuthenticationException();
          }
          return (RealmSecurityManager) securityManager;
      }
  
      public static CausewayModuleExtSecmanShiroRealm getCausewayModuleSecurityRealm() {
          final RealmSecurityManager securityManager = getSecurityManager();
          final Collection<Realm> realms = securityManager.getRealms();
          for (Realm realm : realms) {
              if(realm instanceof CausewayModuleExtSecmanShiroRealm) {
                  CausewayModuleExtSecmanShiroRealm imsr = (CausewayModuleExtSecmanShiroRealm) realm;
                  return imsr;
              }
          }
          return null;
      }
  
      public static boolean isSingleRealm() {
          final RealmSecurityManager securityManager = getSecurityManager();
          return securityManager.getRealms().size() == 1;
      }
  
  }
  