HashService.java

/*
 * 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.avatarserver.service;

import fr.paris.lutece.portal.service.util.AppLogService;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Hash Service
 *
 */
public final class HashService
{
    /** Private constructor */
    private HashService( )
    {
    }

    /**
     * Calculate the Hash corresponding to the given email
     * 
     * @param strAvatarEmail
     *            The Email
     * @return The Hash
     */
    public static String getHash( String strAvatarEmail )
    {
        String strEmail = strAvatarEmail.toLowerCase( );
        MessageDigest md;

        try
        {
            md = MessageDigest.getInstance( "MD5" );

            byte [ ] hash = md.digest( strEmail.getBytes( ) );
            StringBuilder sb = new StringBuilder( );

            for ( int i = 0; i < hash.length; i++ )
            {
                sb.append( Integer.toString( ( hash [i] & 0xff ) + 0x100, 16 ).substring( 1 ) );
            }

            return sb.toString( );
        }
        catch( NoSuchAlgorithmException ex )
        {
            AppLogService.error( "Error getting gravatar : " + ex.getMessage( ), ex );
        }

        return "";
    }
}