/*
    * Copyright (c) 2002-2014, Mairie de Paris
    * All rights reserved.
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    *
    *  1. Redistributions of source code must retain the above copyright notice
   *     and the following disclaimer.
   *
   *  2. Redistributions in binary form must reproduce the above copyright notice
   *     and the following disclaimer in the documentation and/or other materials
   *     provided with the distribution.
   *
   *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
   *     contributors may be used to endorse or promote products derived from
   *     this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   * License 1.0
   */
  package fr.paris.lutece.plugins.mylutece.modules.oauth.service;
  
  import fr.paris.lutece.plugins.mylutece.authentication.MultiLuteceAuthentication;
  import fr.paris.lutece.plugins.mylutece.modules.oauth.authentication.OAuthAuthentication;
  import fr.paris.lutece.plugins.mylutece.modules.oauth.authentication.OAuthUser;
  import fr.paris.lutece.plugins.mylutece.modules.oauth.business.OAuthAuthenticationHome;
  import fr.paris.lutece.portal.service.plugin.Plugin;
  import fr.paris.lutece.portal.service.plugin.PluginService;
  import fr.paris.lutece.portal.service.security.LuteceAuthentication;
  import fr.paris.lutece.portal.service.security.SecurityService;
  import fr.paris.lutece.portal.service.util.AppException;
  import fr.paris.lutece.portal.service.util.AppLogService;
  import fr.paris.lutece.portal.service.util.AppPathService;
  import fr.paris.lutece.portal.web.PortalJspBean;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import javax.servlet.http.HttpServletRequest;
  
  
  /**
   *
   * OAuthService
   */
  public final class OAuthService
  {
      private Map<String, OAuthAuthentication> _mapAuthentications;
  
      /**
       * Private constructor
       */
      private OAuthService(  )
      {
          // nothing
          _mapAuthentications = new HashMap<String, OAuthAuthentication>(  );
      }
  
      /**
       * Inits the authentications.
       * <strong>Plugin needs to be configured (i.e. pool set)</strong>
       */
      public void init(  )
      {
          Plugin plugin = PluginService.getPlugin( OAuthPlugin.PLUGIN_NAME );
  
          if ( plugin != null )
          {
              // call home to register available auth.
              try
              {
                  List<OAuthAuthentication> listAuthentication = OAuthAuthenticationHome.findAll( plugin );
  
                  for ( OAuthAuthentication authentication : listAuthentication )
                  {
                      registerAuthentication( authentication );
                  }
              }
              catch ( AppException e )
              {
                  AppLogService.error( "Unable to find registered OAuth authentications in module-mylutece-oauth : " +
                      e.getMessage(  ), e );
              }
          }
     }
 
     /**
      * Gets the authentication
      * @param strAuthName the auth name
      * @return the authentication found, <code>null</code> otherwise.
      */
     public OAuthAuthentication getAuthentication( String strAuthName )
     {
         return _mapAuthentications.get( strAuthName );
     }
 
     /**
      * Finds the registered authentication list.
      * @return the registered authentications
      */
     public List<OAuthAuthentication> getListAuthentication(  )
     {
         return new ArrayList<OAuthAuthentication>( _mapAuthentications.values(  ) );
     }
 
     /**
      * Call {@link MultiLuteceAuthentication} activation.
      * @param authentication the authentication
      */
     private void registerAuthentication( OAuthAuthentication authentication )
     {
         MultiLuteceAuthentication.registerAuthentication( authentication );
         _mapAuthentications.put( authentication.getName(  ), authentication );
     }
 
     /**
      * Call {@link MultiLuteceAuthentication} activation.
      * @param strAuthenticationName the authentication
      */
     private void removeAuthentication( String strAuthenticationName )
     {
         MultiLuteceAuthentication.removeAuthentication( strAuthenticationName );
         _mapAuthentications.remove( strAuthenticationName );
     }
 
     /**
      * Creates a new authentication and registers it.
      * @param authentication the authentication to create
      * @param plugin the plugin
      */
     public void createNewAuthentication( OAuthAuthentication authentication, Plugin plugin )
     {
         OAuthAuthenticationHome.create( authentication, plugin );
         registerAuthentication( authentication );
     }
 
     /**
      * Updates the authentication : registers it and saves it.
      * @param authentication the authentication
      * @param plugin the plugin
      */
     public void updateAuthentication( OAuthAuthentication authentication, Plugin plugin )
     {
         OAuthAuthenticationHome.update( authentication, plugin );
         // update current authentication since name is not mutable.
         registerAuthentication( authentication );
     }
 
     /**
      * Removes the authentication
      * @param strAuthenticationName the authentication name.
      * @param plugin the plugin
      */
     public void removeAuthentication( String strAuthenticationName, Plugin plugin )
     {
         OAuthAuthenticationHome.remove( strAuthenticationName, plugin );
         removeAuthentication( strAuthenticationName );
     }
 
     /**
      * Do the actual authentication
      * @param request the request with auth_provider parameter
      * @return portal url if no error
      */
     public String doAuthentication( HttpServletRequest request )
     {
         String strAuthProvider = request.getParameter( "auth_provider" );
 
         if ( AppLogService.isDebugEnabled(  ) )
         {
             AppLogService.debug( "OAuth provider : " + strAuthProvider );
         }
 
         if ( SecurityService.getInstance(  ).isMultiAuthenticationSupported(  ) )
         {
             MultiLuteceAuthentication mainAuthentication = (MultiLuteceAuthentication) SecurityService.getInstance(  )
                                                                                                       .getAuthenticationService(  );
 
             LuteceAuthentication authentication = mainAuthentication.getLuteceAuthentication( strAuthProvider );
 
             if ( ( authentication == null ) || !( authentication instanceof OAuthAuthentication ) )
             {
                 throw new AppException( "Can't use provided authentication paramater : " + strAuthProvider +
                     ". Found : " + authentication );
             }
 
             OAuthAuthentication oAuthAuthentication = (OAuthAuthentication) authentication;
             OAuthUser user = oAuthAuthentication.getUser( request );
             SecurityService.getInstance(  ).registerUser( request, user );
         }
 
         String strReturnUrl = PortalJspBean.getLoginNextUrl( request );
 
         if ( strReturnUrl != null )
         {
             return strReturnUrl;
         }
 
         return AppPathService.getBaseUrl( request ) + AppPathService.getPortalUrl(  );
     }
 }