/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.guacamole.properties;

import com.google.common.io.BaseEncoding;
import org.apache.guacamole.GuacamoleException;
import org.apache.guacamole.GuacamoleServerException;

/**
 * A GuacamoleProperty whose value is a byte array. The bytes of the byte array
 * must be represented as a hexadecimal string within the property value. The
 * hexadecimal string is case-insensitive.
 */
public abstract class ByteArrayProperty implements GuacamoleProperty<byte[]> {

    @Override
    public byte[] parseValue(String value) throws GuacamoleException {

        // If no property provided, return null.
        if (value == null)
            return null;

        // Return value parsed from hex
        try {
            return BaseEncoding.base16().decode(value.toUpperCase());
        }

        // Fail parse if hex invalid
        catch (IllegalArgumentException e) {
            throw new GuacamoleServerException("Invalid hexadecimal value.", e);
        }

    }

}