Arakne / ArakneUtils

 * This file is part of ArakneUtils.

 *

 * ArakneUtils is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * ArakneUtils is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with ArakneUtils.  If not, see <https://www.gnu.org/licenses/>.

 *

 * Copyright (c) 2017-2020 Vincent Quatrevieux

 */

package fr.arakne.utils.maps.serializer;

import fr.arakne.utils.encoding.Checksum;

import fr.arakne.utils.encoding.Key;

/**

 * Implementation of the map serializer for encrypted map data

 * Encrypted maps are maps with file name ending with X.swf (ex: 10340_0706131721X.swf)

 * and require a key sent by the server with the GDM packet

 *

 * <code>

 *     MapDataSerializer serializer = new EncryptedMapDataSerializer(Key.parse(gdm.key()));

 *     CellData[] cells = serializer.deserialize(encryptedMapData);

 * </code>

 *

 * https://github.com/Emudofus/Dofus/blob/1.29/dofus/managers/MapsServersManager.as#L137

 */

final public class EncryptedMapDataSerializer implements MapDataSerializer {

    final private Key key;

    final private MapDataSerializer plainDataSerializer;

    public EncryptedMapDataSerializer(Key key) {

        this(key, new DefaultMapDataSerializer());

    }

    public EncryptedMapDataSerializer(Key key, MapDataSerializer plainDataSerializer) {

        this.key = key;

        this.plainDataSerializer = plainDataSerializer;

    }

    @Override

    public CellData[] deserialize(String mapData) {

        return plainDataSerializer.deserialize(key.cipher().decrypt(mapData, Checksum.integer(key.toString()) * 2));

    }

}