Arakne / Araknemu

 * This file is part of Araknemu.

 *

 * Araknemu 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.

 *

 * Araknemu 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 Araknemu.  If not, see <https://www.gnu.org/licenses/>.

 *

 * Copyright (c) 2017-2020 Vincent Quatrevieux

 */

package fr.quatrevieux.araknemu.util;

import org.apache.commons.lang3.StringUtils;

import java.io.UnsupportedEncodingException;

import java.net.URLEncoder;

import java.nio.charset.StandardCharsets;

/**

 * Utility class for escape string

 */

public final class Escape {

    // Replacement pairs

    // The two firsts pairs are used to ignore substrings :

    // the client already escape < and > when sending message, so ignore &lt; and &gt; to ensure that sending ">" will not be displayed as "&gt;"

    private static final String[] TO_ESCAPE = new String[] {"&lt;", "&gt;", "<", ">", "&", "|"};

    private static final String[] REPLACEMENT = new String[] {"<", ">", "<", ">", "&", ""};

    private Escape() {}

    /**

     * Escape HTML chars

     * Note: "<" and ">" sequences are ignored due to client side encoding

     *

     * @param value Value to escape

     *

     * @return Escaped (safe) value

     */

    /**

     * Perform URL encode

     *

     * @param value Value to encode

     *

     * @return Encoded value

     */

    public static String url(String value) {

        try {

            return URLEncoder.encode(value, StandardCharsets.UTF_8.name());

        } catch (UnsupportedEncodingException e) {

        }

    }

}