/*
    * Copyright (c) 2002-2022, City of 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.portal.service.file.implementation;
  
  import fr.paris.lutece.portal.service.file.ExpiredLinkException;
  import fr.paris.lutece.portal.service.file.FileService;
  import static fr.paris.lutece.portal.service.file.FileService.PARAMETER_VALIDITY_TIME;
  import fr.paris.lutece.portal.service.file.IFileDownloadUrlService;
  import fr.paris.lutece.portal.service.security.RsaService;
  import fr.paris.lutece.portal.service.util.AppLogService;
  import fr.paris.lutece.portal.service.util.AppPathService;
  import fr.paris.lutece.util.url.UrlItem;
  import java.security.GeneralSecurityException;
  import java.sql.Timestamp;
  import java.time.LocalDateTime;
  import java.util.HashMap;
  import java.util.Map;
  import javax.servlet.http.HttpServletRequest;
  import org.apache.commons.lang3.StringUtils;
  
  /**
   * 
   * DatabaseBlobStoreService.
   * 
   */
  public class DefaultFileDownloadService implements IFileDownloadUrlService
  {
      private static final long serialVersionUID = 1L;
  
      // constants
      protected static final String URL_FO = "jsp/site/file/download";
      protected static final String URL_BO = "jsp/admin/file/download";
      private static final String SERVICE_NAME = "DefaultFileDownloadService";
      private static final String SEPARATOR = "/";
  
      // Keys
      public static final String KEY_LINK_VALIDITY_TIME = "link_validity_time";
  
      /**
       * Build the additionnel data map to provide encryption data
       * 
       * @param strFileId
       * @param strResourceId
       * @param strResourceType
       * @return the map
       */
      public static Map<String, String> buildAdditionnalDatas( String strFileId, String strResourceId, String strResourceType )
      {
          Map<String, String> map = new HashMap<>( );
  
          map.put( FileService.PARAMETER_FILE_ID, strFileId );
          map.put( FileService.PARAMETER_RESOURCE_ID, strResourceId );
          map.put( FileService.PARAMETER_RESOURCE_TYPE, strResourceType );
  
          return map;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public String getFileDownloadUrlFO( String strFileKey, String strFileStorageServiceProviderName )
      {
  
          return getFileDownloadUrlFO( strFileKey, null, strFileStorageServiceProviderName );
      }
  
      /**
      * {@inheritDoc}
      */
     @Override
     public String getFileDownloadUrlFO( String strFileKey, Map<String, String> additionnalData, String strFileStorageServiceProviderName )
     {
         StringBuilder sbUrl = new StringBuilder( );
 
         sbUrl.append( AppPathService.getBaseUrl( null ) );
         sbUrl.append( URL_FO );
 
         if ( additionnalData == null )
         {
             additionnalData = new HashMap<>( );
         }
         additionnalData.put( FileService.PARAMETER_FILE_ID, strFileKey );
 
         return getEncryptedUrl( sbUrl.toString( ), getDataToEncrypt( additionnalData ), strFileStorageServiceProviderName );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getFileDownloadUrlBO( String strFileKey, String strFileStorageServiceProviderName )
     {
         return getFileDownloadUrlBO( strFileKey, null, strFileStorageServiceProviderName );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getFileDownloadUrlBO( String strFileKey, Map<String, String> additionnalData, String strFileStorageServiceProviderName )
     {
 
         StringBuilder sbUrl = new StringBuilder( );
 
         sbUrl.append( AppPathService.getBaseUrl( null ) );
         sbUrl.append( URL_BO );
 
         if ( additionnalData == null )
         {
             additionnalData = new HashMap<>( );
         }
         additionnalData.put( FileService.PARAMETER_FILE_ID, strFileKey );
 
         return getEncryptedUrl( sbUrl.toString( ), getDataToEncrypt( additionnalData ), strFileStorageServiceProviderName );
     }
 
     /**
      * get encrypted url
      * 
      * @param strUrl
      * @param additionnalData
      * 
      * @return the url, null otherwise
      */
     protected String getEncryptedUrl( String strUrl, String dataToEncrypt, String strFileStorageServiceProviderName )
     {
         UrlItemil/url/UrlItem.html#UrlItem">UrlItem item = new UrlItem( strUrl );
 
         try
         {
             String idEncrytped = RsaService.encryptRsa( dataToEncrypt );
 
             item.addParameter( FileService.PARAMETER_PROVIDER, strFileStorageServiceProviderName );
             item.addParameter( FileService.PARAMETER_DATA, idEncrytped );
 
             return item.getUrlWithEntity( );
         }
         catch( GeneralSecurityException e )
         {
             AppLogService.error( e.getMessage( ), e );
             return null;
         }
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getName( )
     {
         return SERVICE_NAME;
     }
 
     /**
      * get data to encrypt
      * 
      * @param fileDownloadData
      * @return the map of datas to encrypt in the url
      */
     private String getDataToEncrypt( Map<String, String> additionnalData )
     {
         StringBuilder sb = new StringBuilder( );
         sb.append( StringUtils.defaultIfEmpty( additionnalData.get( FileService.PARAMETER_FILE_ID ), "" ) ).append( SEPARATOR );
         sb.append( StringUtils.defaultIfEmpty( additionnalData.get( FileService.PARAMETER_RESOURCE_ID ), "" ) ).append( SEPARATOR );
         sb.append( StringUtils.defaultIfEmpty( additionnalData.get( FileService.PARAMETER_RESOURCE_TYPE ), "" ) ).append( SEPARATOR );
         sb.append( calculateEndValidity( ) );
 
         return sb.toString( );
     }
 
     /**
      * get end validity time
      * 
      * @return the end time of url validity
      */
     protected long calculateEndValidity( )
     {
         LocalDateTime endValidity = LocalDateTime.MAX;
         if ( getValidityTime( ) > 0 )
         {
             endValidity = LocalDateTime.now( ).plusMinutes( LINK_VALIDITY_TIME );
         }
         return Timestamp.valueOf( endValidity ).getTime( );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Map<String, String> getRequestDataBO( HttpServletRequest request )
     {
         String strEncryptedData = request.getParameter( FileService.PARAMETER_DATA );
 
         try
         {
             String strDecryptedData = RsaService.decryptRsa( strEncryptedData );
             return getDecryptedData( strDecryptedData );
         }
         catch( GeneralSecurityException e )
         {
             AppLogService.error( e.getMessage( ), e );
             return null;
         }
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Map<String, String> getRequestDataFO( HttpServletRequest request )
     {
         String strEncryptedData = request.getParameter( FileService.PARAMETER_DATA );
 
         try
         {
             String strDecryptedData = RsaService.decryptRsa( strEncryptedData );
             return getDecryptedData( strDecryptedData );
         }
         catch( GeneralSecurityException e )
         {
             AppLogService.error( e.getMessage( ), e );
             return null;
         }
     }
 
     /**
      * get map of datas from encrypted url data parameter
      * 
      * @param data
      * @return the map of
      */
     protected Map<String, String> getDecryptedData( String strData )
     {
         String [ ] data = strData.split( SEPARATOR );
         Map<String, String> fileData = buildAdditionnalDatas( data [0], data [1], data [2] );
         fileData.put( PARAMETER_VALIDITY_TIME, data [3] );
 
         return fileData;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void checkLinkValidity( Map<String, String> fileData ) throws ExpiredLinkException
     {
         LocalDateTime validityTime = new Timestamp( Long.parseLong( fileData.get( FileService.PARAMETER_VALIDITY_TIME ) ) ).toLocalDateTime( );
 
         if ( LocalDateTime.now( ).isAfter( validityTime ) )
         {
             throw new ExpiredLinkException( "Link expired on : " + validityTime.toString( ) );
         }
     }
 }