[jira] [Created] (VALIDATOR-483) DomainValidator conversion to ASCII uses an obsoleted standard

["Julien Bernard (Jira)" <ji...@apache.org>]

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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