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/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * Licensed 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.alibaba.nacos.common.utils;

import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * ip tool.
 *
 * @author Nacos
 */
@SuppressWarnings({"checkstyle:AbbreviationAsWordInName", "PMD.ClassNamingShouldBeCamelRule"})
public class InternetAddressUtil {

    private InternetAddressUtil() {
    }

    public static final boolean PREFER_IPV6_ADDRESSES = Boolean.parseBoolean(System.getProperty("java.net.preferIPv6Addresses"));
    
    public static final String IPV6_START_MARK = "[";
    
    public static final String IPV6_END_MARK = "]";
    
    public static final String ILLEGAL_IP_PREFIX = "illegal ip: ";
    
    public static final String IP_PORT_SPLITER = ":";
    
    public static final int SPLIT_IP_PORT_RESULT_LENGTH = 2;
    
    public static final String PERCENT_SIGN_IN_IPV6 = "%";
    
    public static final String LOCAL_HOST = "localhost";
    
    private static final String LOCAL_HOST_IP_V4 = "127.0.0.1";
    
    private static final String LOCAL_HOST_IP_V6 = "[::1]";
    
    private static final String CHECK_OK = "ok";
    
    private static final Pattern DOMAIN_PATTERN = Pattern.compile("[a-zA-Z0-9][-a-zA-Z0-9]{0,62}(\\.[a-zA-Z0-9][-a-zA-Z0-9]{0,62})+\\.?");
    
    private static final String IPV4_TUPLE = "(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])";
    
    private static final Pattern IPV4_PATTERN = Pattern
            .compile("(?