de.mpg.escidoc.services.aa.TanStore.java Source code

Introduction

Here is the source code for de.mpg.escidoc.services.aa.TanStore.java

Source

/*
*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at license/ESCIDOC.LICENSE
* or http://www.escidoc.org/license.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at license/ESCIDOC.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/

/*
* Copyright 2006-2012 Fachinformationszentrum Karlsruhe Gesellschaft
* fr wissenschaftlich-technische Information mbH and Max-Planck-
* Gesellschaft zur Frderung der Wissenschaft e.V.
* All rights reserved. Use is subject to license terms.
*/

package de.mpg.escidoc.services.aa;

import java.util.Date;
import java.util.HashSet;
import java.util.Random;
import java.util.Set;

import org.apache.commons.codec.binary.Base64;

/**
 * TODO Description
 *
 * @author franke (initial creation)
 * @author $Author$ (last modification)
 * @version $Revision$ $LastChangedDate$
 *
 */
public class TanStore {
    private static Set<String> tanSet = new HashSet<String>();

    public static boolean checkTan(String tan) {
        if (tanSet.contains(tan)) {
            // TAN found, now remove it
            tanSet.remove(tan);
            return true;
        } else {
            // TAN not found
            return false;
        }
    }

    public static boolean storeTan(String tan) {
        if (tanSet.contains(tan)) {
            // TAN already stored
            return false;
        } else {
            // Add new TAN to store
            tanSet.add(tan);
            return true;
        }
    }

    /**
     * Generate a random transaction number.
     * 
     * @param id The session id.
     * @return a random transaction number
     */
    public static String createTan(String id) {
        Random random = new Random(new Date().getTime());

        byte[] tanBytes = new byte[16];

        random.nextBytes(tanBytes);

        return new String(Base64.encodeBase64(tanBytes));
    }
}