/**
    * This file Copyright (c) 2003-2018 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.cms.security;
  
  import info.magnolia.cms.security.auth.ACL;
  import info.magnolia.cms.security.auth.GroupList;
  import info.magnolia.cms.security.auth.RoleList;
  import info.magnolia.context.MgnlContext;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  import javax.jcr.Value;
  import javax.security.auth.Subject;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Manages the JAAS users.
   */
  public class ExternalUserManager implements UserManager {
  
      private static final Logger log = LoggerFactory.getLogger(ExternalUserManager.class);
  
      @Override
      public User getUser(String name) throws UnsupportedOperationException {
          // we only support accessing current User object
          // - implement source specific UserManager if needed
          if (name.equalsIgnoreCase(MgnlContext.getUser().getName())) {
              return MgnlContext.getUser();
          }
          throw new UnsupportedOperationException("not implemented yet");
      }
  
      @Override
      public User getUserById(final String id) throws UnsupportedOperationException {
          throw new UnsupportedOperationException("not implemented yet");
      }
  
      /**
       * Initialize new user using JAAS authenticated/authorized subject.
       */
      @Override
      public User getUser(Subject subject) throws UnsupportedOperationException {
          return new ExternalUser(subject);
      }
  
      public User getUser(Map<String, String> properties, GroupList groupList, RoleList roleList) {
          return new ExternalUser(properties, groupList, roleList);
      }
  
      @Override
      public Collection<User> getAllUsers() throws UnsupportedOperationException {
          throw new UnsupportedOperationException("not implemented yet");
      }
  
      @Override
      public User createUser(String name, String pw) throws UnsupportedOperationException {
          throw new UnsupportedOperationException("not implemented yet");
      }
  
      @Override
      public User createUser(String path, String name, String pw) throws UnsupportedOperationException {
          throw new UnsupportedOperationException("not implemented yet");
     }
 
     @Override
     public User../../../info/magnolia/cms/security/User.html#User">User changePassword(User user, String newPassword) throws UnsupportedOperationException {
         throw new UnsupportedOperationException("not implemented yet");
     }
 
     /**
      * SystemUserManager does this.
      */
     @Override
     public User getSystemUser() throws UnsupportedOperationException {
         throw new UnsupportedOperationException();
     }
 
     /**
      * SystemUserManager does this.
      */
     @Override
     public User getAnonymousUser() throws UnsupportedOperationException {
         throw new UnsupportedOperationException();
     }
 
     @Override
     public void updateLastAccessTimestamp(User user) throws UnsupportedOperationException {
         throw new UnsupportedOperationException();
     }
 
     @Override
     public boolean hasAny(String name, String roleName, String nodeRoles) throws UnsupportedOperationException {
         throw new UnsupportedOperationException("not implemented yet");
     }
 
     @Override
     public Map<String, ACL> getACLs(User user) {
         throw new UnsupportedOperationException("not implemented yet");
     }
 
     @Override
     public Useref="../../../../info/magnolia/cms/security/User.html#User">User addRole(User user, String roleName) {
         throw new UnsupportedOperationException("not implemented yet");
     }
 
     @Override
     public Userf="../../../../info/magnolia/cms/security/User.html#User">User addGroup(User user, String groupName) {
         throw new UnsupportedOperationException("not implemented yet");
     }
 
     @Override
     public int getLockTimePeriod() {
         throw new UnsupportedOperationException("Not supported by this user manager.");
     }
 
     @Override
     public int getMaxFailedLoginAttempts() {
         throw new UnsupportedOperationException("Not supported by this user manager.");
     }
 
     @Override
     public void setLockTimePeriod(int lockTimePeriod) {
         throw new UnsupportedOperationException("Not supported by this user manager.");
     }
 
     @Override
     public void setMaxFailedLoginAttempts(int maxFailedLoginAttempts) {
         throw new UnsupportedOperationException("Not supported by this user manager.");
     }
 
     @Override
     public User../../../../info/magnolia/cms/security/User.html#User">User setProperty(User user, String propertyName, Value propertyValue) {
         throw new UnsupportedOperationException("Not supported by this user manager.");
     }
 
     @Override
     public User../../../../info/magnolia/cms/security/User.html#User">User setProperty(User user, String propertyName, String propertyValue) {
         throw new UnsupportedOperationException("Not supported by this user manager.");
     }
 
     @Override
     public User../../../../info/magnolia/cms/security/User.html#User">User removeGroup(User user, String groupName) {
         throw new UnsupportedOperationException("not implemented yet");
     }
 
     @Override
     public User"../../../../info/magnolia/cms/security/User.html#User">User removeRole(User user, String roleName) {
         throw new UnsupportedOperationException("not implemented yet");
     }
 
     /**
      * Default implementation for external userManagers. Please overwrite in case it can be implemented in a more efficient way.
      */
     @Override
     public Collection<String> getUsersWithGroup(String groupName, boolean transitive) {
         if (!transitive) {
             return getUsersWithGroup(groupName);
         }
 
         Collection<User> allUsers = getAllUsers();
         Set<String> usersWithGroup = new HashSet<>();
         // Can't inject securitySupport or get static instance of SecuritySupport during the initialization phase.
         GroupManager man = SecuritySupport.Factory.getInstance().getGroupManager();
         Collection<String> groupNames = man.getAllSubGroups(groupName);
         groupNames.add(groupName);
         for (User currentUser: allUsers) {
             for (String transitiveGroupName: groupNames) {
                 if (currentUser.inGroup(transitiveGroupName)) {
                     usersWithGroup.add(currentUser.getName());
                     break;
                 }
             }
         }
         return usersWithGroup;
     }
 
     /**
      * Default implementation for external userManagers. Please overwrite in case it can be implemented in a more efficient way.
      */
     @Override
     public Collection<String> getUsersWithGroup(final String groupName) {
         Collection<User> users = getAllUsers();
         Collection<String> usersWithProvidedGroup = new ArrayList<>();
         for (User current: users) {
             if (current.inGroup(groupName)) {
                 usersWithProvidedGroup.add(current.getName());
             }
         }
 
         return usersWithProvidedGroup;
     }
 
     /**
      * Default implementation for external userManagers. Please overwrite in case it can be implemented in a more efficient way.
      */
     @Override
     public Collection<String> getUsersWithRole(final String roleName) {
         Collection<User> users = getAllUsers();
         Collection<String> usersWithProvidedGroup = new ArrayList<String>();
         for (User current : users) {
             if (current.hasRole(roleName)) {
                 usersWithProvidedGroup.add(current.getName());
             }
         }
 
         return usersWithProvidedGroup;
     }
 }