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5012893c1d
This change renames directories in preparation for the great package rename. The repository is now in a broken state because the code itself hasn't been updated. However this should ensure that git correctly preserves history for each file.
67 lines
2.9 KiB
Java
67 lines
2.9 KiB
Java
// Copyright 2016 The Domain Registry Authors. 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 static com.google.common.base.Preconditions.checkArgument;
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import com.google.common.base.Ascii;
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import com.google.common.base.Strings;
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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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/**
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* Returns the canonicalized TLD part of a valid domain name (just an SLD, no subdomains) by
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* stripping off the leftmost part.
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*
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* <p>This function is compatible with multi-part tlds, e.g. {@code co.uk}. This function will
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* also work on domains for which the registry is not authoritative. If you are certain that the
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* input will be under a TLD this registry controls, then it is preferable to use
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* {@link com.google.domain.registry.model.registry.Registries#findTldForName(InternetDomainName)
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* Registries#findTldForName}, which will work on hostnames in addition to domains.
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*
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* @param fullyQualifiedDomainName must be a punycode SLD (not a host or unicode)
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* @throws IllegalArgumentException if there is no TLD
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*/
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public static String getTldFromDomainName(String fullyQualifiedDomainName) {
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checkArgument(
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!Strings.isNullOrEmpty(fullyQualifiedDomainName),
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"fullyQualifiedDomainName cannot be null or empty");
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InternetDomainName domainName = InternetDomainName.from(fullyQualifiedDomainName);
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checkArgument(domainName.hasParent(), "fullyQualifiedDomainName does not have a TLD");
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return domainName.parent().toString();
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}
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private DomainNameUtils() {}
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}
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