Julien Bernard created VALIDATOR-483:
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Summary: DomainValidator conversion to ASCII uses an obsoleted
standard
Key: VALIDATOR-483
URL: https://issues.apache.org/jira/browse/VALIDATOR-483
Project: Commons Validator
Issue Type: Bug
Components: Routines
Environment: Java openjdk 11 on Linux
Reporter: Julien Bernard
DomainValidator uses java.net.IDN for its conversion to ASCII which is based on
RFC3490 (IDNA 2003) that is obsoleted by RFC 5891 (IDNA 2008).
An external library such as ICU4J may be used for an IDNA 2008 compliant
conversion:
{code:java}
int flags = IDNA.CHECK_BIDI
| IDNA.CHECK_CONTEXTJ
| IDNA.CHECK_CONTEXTO
| IDNA.NONTRANSITIONAL_TO_ASCII
| IDNA.USE_STD3_RULES;
IDNA idna = IDNA.getUTS46Instance(flags);
IDNA.Info info = new IDNA.Info();
String domainAscii = idna.nameToASCII(domain, new StringBuilder(), info);
// check error with info.hasErrors() {code}
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