com.migo.defence.SQLFilter.java Source code

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Here is the source code for com.migo.defence.SQLFilter.java

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/*
 * 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 com.migo.defence;

import com.migo.utils.RRException;
import org.apache.commons.lang.StringUtils;

/**
 * @author 
 * @email fei6751803@163.com
 */
public class SQLFilter {

    /**
     * SQL
     * @param str  ?
     */
    public static String sqlInject(String str) {
        if (StringUtils.isBlank(str)) {
            return null;
        }
        //'|"|;|\
        str = StringUtils.replace(str, "'", "");
        str = StringUtils.replace(str, "\"", "");
        str = StringUtils.replace(str, ";", "");
        str = StringUtils.replace(str, "\\", "");

        //???
        str = str.toLowerCase();

        //?
        String[] keywords = { "master", "truncate", "insert", "select", "delete", "update", "declare", "alert",
                "create", "drop" };

        //???
        for (String keyword : keywords) {
            if (str.contains(keyword)) {
                throw new RRException("??");
            }
        }

        return str;
    }
}