/**
 * Copyright (c) 2018 人人开源 All rights reserved.
 * <p>
 * https://www.renren.io
 * <p>
 * 版权所有，侵权必究！
 */

package io.bdty.common.xss;

import cn.hutool.core.util.StrUtil;
import io.bdty.common.exception.ErrorCode;
import io.bdty.common.exception.RenException;

/**
 * SQL过滤
 *
 * @author Mark sunlightcs@gmail.com
 */
public class SqlFilter {

    /**
     * SQL注入过滤
     *
     * @param str 待验证的字符串
     */
    public static String sqlInject(String str) {
        if (StrUtil.isBlank(str)) {
            return null;
        }
        //去掉'|"|;|\字符
        str = StrUtil.replace(str, "'", "");
        str = StrUtil.replace(str, "\"", "");
        str = StrUtil.replace(str, ";", "");
        str = StrUtil.replace(str, "\\", "");

        //转换成小写
        str = str.toLowerCase();

        //非法字符
        String[] keywords = {"master", "truncate", "insert", "select", "delete", "update", "declare", "alter", "drop"};

        //判断是否包含非法字符
        for (String keyword : keywords) {
            if (str.contains(keyword)) {
                throw new RenException(ErrorCode.INVALID_SYMBOL);
            }
        }

        return str;
    }
}
