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Graylog

There is a newer version: 5.2.7

/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  If not, see .
 */
package org.graylog2.inputs.converters;

import org.apache.commons.codec.digest.DigestUtils;
import org.graylog2.plugin.inputs.Converter;

import java.util.Map;

public class HashConverter extends Converter {

    public HashConverter(Map config) {
        super(Type.HASH, config);
    }

    @SuppressWarnings("WEAK_MESSAGE_DIGEST_MD5")
    @Override
    public Object convert(String value) {
        if (value == null || value.isEmpty()) {
            return value;
        }

        // MessageDigest is not threadsafe. #neverForget
        return DigestUtils.md5Hex(value);
    }

    @Override
    public boolean buildsMultipleFields() {
        return false;
    }

}