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c458c05801
The dark lord Gosling designed the Java package naming system so that ownership flows from the DNS system. Since we own the domain name registry.google, it seems only appropriate that we should use google.registry as our package name.
57 lines
2.2 KiB
Java
57 lines
2.2 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 google.registry.tldconfig.idn;
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import static google.registry.tldconfig.idn.IdnTableEnum.EXTENDED_LATIN;
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import static google.registry.tldconfig.idn.IdnTableEnum.JA;
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import com.google.common.base.Optional;
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import com.google.common.collect.ImmutableList;
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import com.google.common.collect.ImmutableMap;
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import google.registry.util.Idn;
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import google.registry.util.NonFinalForTesting;
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/** Validates whether a given IDN label can be provisioned for a particular TLD. */
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public final class IdnLabelValidator {
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/** Most TLDs will use this generic list of IDN tables. */
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private static final ImmutableList<IdnTableEnum> DEFAULT_IDN_TABLES =
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ImmutableList.of(EXTENDED_LATIN, JA);
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/** Some TLDs have their own IDN tables, configured here. */
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@NonFinalForTesting
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private static ImmutableMap<String, ImmutableList<IdnTableEnum>> idnTableListsPerTld =
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ImmutableMap.of("xn--q9jyb4c", ImmutableList.of(EXTENDED_LATIN, JA));
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/**
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* Returns name of first matching {@link IdnTable} if domain label is valid for the given TLD.
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*
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* <p>A label is valid if it is considered valid by at least one configured IDN table for that
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* TLD. If no match is found, an absent value is returned.
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*/
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public static Optional<String> findValidIdnTableForTld(String label, String tld) {
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String unicodeString = Idn.toUnicode(label);
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for (IdnTableEnum idnTable
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: Optional.fromNullable(idnTableListsPerTld.get(tld)).or(DEFAULT_IDN_TABLES)) {
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if (idnTable.getTable().isValidLabel(unicodeString)) {
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return Optional.of(idnTable.getTable().getName());
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}
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}
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return Optional.absent();
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}
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private IdnLabelValidator() {}
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}
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