mirror of
https://github.com/google/nomulus.git
synced 2025-04-30 20:17:51 +02:00
77 lines
3.2 KiB
Java
77 lines
3.2 KiB
Java
// Copyright 2017 The Nomulus Authors. All Rights Reserved.
|
|
//
|
|
// 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 google.registry.util;
|
|
|
|
import com.google.common.base.Joiner;
|
|
import com.ibm.icu.text.IDNA;
|
|
import com.ibm.icu.text.IDNA.Info;
|
|
|
|
/**
|
|
* A partial API-compatible replacement for {@link java.net.IDN} that replaces <a
|
|
* href="http://www.ietf.org/rfc/rfc3490.txt">IDNA2003</a> processing with <a
|
|
* href="http://unicode.org/reports/tr46/">UTS46 transitional processing</a>, with differences as
|
|
* described in the <a href="http://www.unicode.org/reports/tr46/#IDNAComparison">UTS46
|
|
* documentation</a>/
|
|
*
|
|
* <p>This class provides methods to convert internationalized domain names (IDNs) between Unicode
|
|
* and ASCII-only <a href="http://www.ietf.org/rfc/rfc3492.txt">Punycode</a> form. It implements the
|
|
* parts of the API from {@link java.net.IDN} that we care about, but will return different results
|
|
* as defined by the differences between IDNA2003 and transitional UTS46.
|
|
*/
|
|
public final class Idn {
|
|
|
|
/** Cached UTS46 with the flags we want. */
|
|
private static final IDNA UTS46_INSTANCE = IDNA.getUTS46Instance(IDNA.CHECK_BIDI);
|
|
|
|
/**
|
|
* Translates a string from Unicode to ASCII Compatible Encoding (ACE), as defined by the ToASCII
|
|
* operation of <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
|
|
*
|
|
* <p>This method always uses <a href="http://unicode.org/reports/tr46/">UTS46 transitional
|
|
* processing</a>.
|
|
*
|
|
* @param name a domain name, which may include multiple labels separated by dots
|
|
* @throws IllegalArgumentException if the input string doesn't conform to RFC 3490 specification
|
|
* @see java.net.IDN#toASCII(String)
|
|
*/
|
|
public static String toASCII(String name) {
|
|
Info info = new Info();
|
|
StringBuilder result = new StringBuilder();
|
|
UTS46_INSTANCE.nameToASCII(name, result, info);
|
|
if (info.hasErrors()) {
|
|
throw new IllegalArgumentException("Errors: " + Joiner.on(',').join(info.getErrors()));
|
|
}
|
|
return result.toString();
|
|
}
|
|
|
|
/**
|
|
* Translates a string from ASCII Compatible Encoding (ACE) to Unicode, as defined by the
|
|
* ToUnicode operation of <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
|
|
*
|
|
* <p>This method always uses <a href="http://unicode.org/reports/tr46/">UTS46 transitional
|
|
* processing</a>.
|
|
*
|
|
* <p>ToUnicode never fails. In case of any error, the input string is returned unmodified.
|
|
*
|
|
* @param name a domain name, which may include multiple labels separated by dots
|
|
* @see java.net.IDN#toUnicode(String)
|
|
*/
|
|
public static String toUnicode(String name) {
|
|
Info info = new Info();
|
|
StringBuilder result = new StringBuilder();
|
|
UTS46_INSTANCE.nameToUnicode(name, result, info);
|
|
return info.hasErrors() ? name : result.toString();
|
|
}
|
|
}
|