111 lines
4.5 KiB
Java
111 lines
4.5 KiB
Java
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package org.mariotaku.twidere.util.net;
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import java.util.regex.Pattern;
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/**
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* A collection of utilities relating to InetAddresses.
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*
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* @since 4.0
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*/
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public class InetAddressUtils {
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private InetAddressUtils() {
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}
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private static final String IPV4_BASIC_PATTERN_STRING =
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"(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}" + // initial 3 fields, 0-255 followed by .
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"([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])"; // final field, 0-255
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private static final Pattern IPV4_PATTERN =
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Pattern.compile("^" + IPV4_BASIC_PATTERN_STRING + "$");
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private static final Pattern IPV4_MAPPED_IPV6_PATTERN = // TODO does not allow for redundant leading zeros
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Pattern.compile("^::[fF]{4}:" + IPV4_BASIC_PATTERN_STRING + "$");
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private static final Pattern IPV6_STD_PATTERN =
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Pattern.compile(
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"^[0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){7}$");
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private static final Pattern IPV6_HEX_COMPRESSED_PATTERN =
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Pattern.compile(
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"^(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)" + // 0-6 hex fields
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"::" +
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"(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)$"); // 0-6 hex fields
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/*
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* The above pattern is not totally rigorous as it allows for more than 7 hex fields in total
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*/
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private static final char COLON_CHAR = ':';
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// Must not have more than 7 colons (i.e. 8 fields)
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private static final int MAX_COLON_COUNT = 7;
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/**
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* Checks whether the parameter is a valid IPv4 address
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*
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* @param input the address string to check for validity
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* @return true if the input parameter is a valid IPv4 address
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*/
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public static boolean isIPv4Address(final String input) {
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return IPV4_PATTERN.matcher(input).matches();
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}
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public static boolean isIPv4MappedIPv64Address(final String input) {
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return IPV4_MAPPED_IPV6_PATTERN.matcher(input).matches();
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}
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/**
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* Checks whether the parameter is a valid standard (non-compressed) IPv6 address
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*
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* @param input the address string to check for validity
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* @return true if the input parameter is a valid standard (non-compressed) IPv6 address
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*/
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public static boolean isIPv6StdAddress(final String input) {
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return IPV6_STD_PATTERN.matcher(input).matches();
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}
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/**
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* Checks whether the parameter is a valid compressed IPv6 address
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*
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* @param input the address string to check for validity
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* @return true if the input parameter is a valid compressed IPv6 address
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*/
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public static boolean isIPv6HexCompressedAddress(final String input) {
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int colonCount = 0;
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for (int i = 0; i < input.length(); i++) {
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if (input.charAt(i) == COLON_CHAR) {
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colonCount++;
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}
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}
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return colonCount <= MAX_COLON_COUNT && IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
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}
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/**
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* Checks whether the parameter is a valid IPv6 address (including compressed).
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*
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* @param input the address string to check for validity
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* @return true if the input parameter is a valid standard or compressed IPv6 address
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*/
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public static boolean isIPv6Address(final String input) {
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return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
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}
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} |