
dev.miku.r2dbc.mysql.util.AddressUtils Maven / Gradle / Ivy
/*
* Copyright 2018-2020 the original author or authors.
*
* 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 dev.miku.r2dbc.mysql.util;
import java.util.regex.Pattern;
/**
* A utility for matching host/address.
*/
public final class AddressUtils {
private static final Pattern IPV4_PATTERN = Pattern.compile("^(([1-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.)(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){2}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$");
private static final Pattern IPV6_PATTERN = Pattern.compile("^[0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){7}$");
private static final Pattern IPV6_COMPRESSED_PATTERN = Pattern.compile("^(([0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){0,5})?)::(([0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){0,5})?)$");
private static final int IPV6_COLONS = 7;
public static boolean isIpv4(String host) {
// TODO: Use faster matches instead of regex.
return IPV4_PATTERN.matcher(host).matches();
}
public static boolean isIpv6(String host) {
// TODO: Use faster matches instead of regex.
return IPV6_PATTERN.matcher(host).matches() || isIpv6Compressed(host);
}
private static boolean isIpv6Compressed(String host) {
int length = host.length();
int colons = 0;
for (int i = 0; i < length; ++i) {
if (host.charAt(i) == ':') {
++colons;
}
}
// TODO: Use faster matches instead of regex.
return colons <= IPV6_COLONS && IPV6_COMPRESSED_PATTERN.matcher(host).matches();
}
private AddressUtils() {
}
}
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