org.zeroturnaround.isjrebel.IsJRebel.java Source code

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Here is the source code for org.zeroturnaround.isjrebel.IsJRebel.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 org.zeroturnaround.isjrebel;

import org.apache.commons.lang3.StringUtils;

import java.util.stream.Stream;

import static org.apache.commons.lang3.StringUtils.reverse;

public class IsJRebel {

    public static final String JREBEL = "JRebel";

    public static boolean isJRebel(String input) {
        return Stream.of(input, reverse(input)).map(IsJRebel::dropPunctuation).map(IsJRebel::l33tReplace)
                .filter(s -> JREBEL.equalsIgnoreCase(s) || StringUtils.getLevenshteinDistance(JREBEL, s) <= 1)
                .findAny().isPresent();
    }

    private static String l33tReplace(String s) {
        return s.replaceAll("1", "l").replaceAll("3", "e").replaceAll("4", "A").replaceAll("5", "S")
                .replaceAll("6", "b").replaceAll("7", "t").replaceAll("8", "B").replaceAll("9", "g")
                .replaceAll("0", "O");
    }

    private static String dropPunctuation(String input) {
        return input.codePoints()
                .filter(c -> Character.isLetter(c) || Character.isDigit(c) || Character.isWhitespace(c))
                .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append).toString();
    }

}