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42 lines
1.6 KiB
Java
42 lines
1.6 KiB
Java
// Copyright 2016 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.google.domain.registry.util;
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import com.google.common.base.Ascii;
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import com.google.common.net.InternetDomainName;
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/** Utility methods related to domain names. */
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public final class DomainNameUtils {
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/** Prefix for unicode domain name parts. */
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public static final String ACE_PREFIX = "xn--";
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public static final String ACE_PREFIX_REGEX = "^xn--";
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/** Checks whether "name" is a strict subdomain of "potentialParent". */
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public static boolean isUnder(InternetDomainName name, InternetDomainName potentialParent) {
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int numNameParts = name.parts().size();
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int numParentParts = potentialParent.parts().size();
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return numNameParts > numParentParts
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&& name.parts().subList(numNameParts - numParentParts, numNameParts)
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.equals(potentialParent.parts());
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}
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/** Canonicalizes a domain name by lowercasing and converting unicode to punycode. */
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public static String canonicalizeDomainName(String label) {
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return Idn.toASCII(Ascii.toLowerCase(label));
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}
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private DomainNameUtils() {}
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}
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