/*
    * Copyright (c) 2002-2016, 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.captcha.modules.recaptcha.service;
  
  import fr.paris.lutece.portal.service.datastore.DatastoreService;
  import fr.paris.lutece.portal.service.plugin.PluginService;
  import fr.paris.lutece.portal.service.util.AppLogService;
  import fr.paris.lutece.util.httpaccess.HttpAccess;
  
  import org.apache.commons.lang.StringUtils;
  
  import java.io.IOException;
  import java.io.StringReader;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  import javax.json.Json;
  import javax.json.JsonObject;
  import javax.json.JsonReader;
  
  import javax.servlet.http.HttpServletRequest;
  
  
  public class ReCaptchaService implements IReCaptchaService
  {
      private static boolean _bActive;
      private static final String PARAM_SECRET = "secret";
      private static final String PARAM_RESPONSE = "response";
      private static final String PARAM_SUCCESS = "success";
      private static final String PARAM_REMOTEIP = "remoteip";
      private static final String PARAM_RECAPTCHA_RESPONSE = "g-recaptcha-response";
      private static final String DSKEY_SITE_KEY = "module.captcha.recaptcha.site_property.siteKey";
      private static final String DSKEY_SECRET_KEY = "module.captcha.recaptcha.site_property.sercretKey";
      private static final String DSKEY_URL_VERIFY = "module.captcha.recaptcha.site_property.urlVerify";
  
      /**
       * Default constructor.
       *
       * Gets the ReCaptchaValidator from the ReCaptcha module.
       * If the validator is missing, sets available to false;
       */
      public ReCaptchaService(  )
      {
          _bActive = PluginService.isPluginEnable( "recaptcha" );
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public String getHtmlCode(  )
      {
          String strKeySite = DatastoreService.getDataValue( DSKEY_SITE_KEY, "" );
  
          if ( isActive(  ) && StringUtils.isNotBlank( strKeySite ) )
          {
              return "<div class=\"g-recaptcha\" data-sitekey=\"" + strKeySite + "\"></div>";
          }
          else
          {
              return StringUtils.EMPTY;
          }
      }
  
      /**
       * {@inheritDoc}
       */
     @Override
     public boolean validate( HttpServletRequest request )
     {
         String gRecaptchaResponse = request.getParameter( PARAM_RECAPTCHA_RESPONSE );
         AppLogService.info( gRecaptchaResponse );
 
         boolean verify = false;
 
         try
         {
             verify = verify( gRecaptchaResponse, request );
         }
         catch ( IOException e )
         {
             AppLogService.error( e.getMessage(  ) );
         }
 
         if ( isActive(  ) && verify )
         {
             return true;
         }
         else
         {
             return false;
         }
     }
 
     private boolean verify( String gRecaptchaResponse, HttpServletRequest request )
         throws IOException
     {
         String strSecretKey = DatastoreService.getDataValue( DSKEY_SECRET_KEY, "" );
         String strUrl = DatastoreService.getDataValue( DSKEY_URL_VERIFY,
                 "https://www.google.com/recaptcha/api/siteverify" );
 
         if ( ( gRecaptchaResponse == null ) || "".equals( gRecaptchaResponse ) || "".equals( strSecretKey ) ||
                 "".equals( strUrl ) )
         {
             AppLogService.error( "Vérifier les paramètres du sites (clé du site, clé secrete, url recaptcha" );
 
             return false;
         }
 
         try
         {
             HttpAccess httpAccess = new HttpAccess(  );
             Map<String, String> mapParameters = new ConcurrentHashMap<String, String>(  );
 
             mapParameters.put( PARAM_SECRET, strSecretKey );
             mapParameters.put( PARAM_RESPONSE, gRecaptchaResponse );
             mapParameters.put( PARAM_REMOTEIP, request.getRemoteAddr(  ) );
 
             String strJson = httpAccess.doPost( strUrl, mapParameters );
 
             JsonReader jsonReader = Json.createReader( new StringReader( strJson ) );
             JsonObject jsonObject = jsonReader.readObject(  );
             jsonReader.close(  );
 
             return jsonObject.getBoolean( PARAM_SUCCESS );
         }
         catch ( Exception e )
         {
             AppLogService.error( e.getMessage(  ) );
 
             return false;
         }
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean isActive(  )
     {
         return _bActive;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setActive( boolean isActive )
     {
         _bActive = isActive;
     }
 }