The subject of supporting IDN's is tricky. We have talked about supporting
them, but there are some issues because they map into ASCII domains in a way
that increases risks of performing domain name spoofing. This is known as the
Homograph Attack.
See http://en.wikipedia.org/wiki/Internationalized_domain_name#Spoofing_concerns
I'm not sure yet what we want our policy to be regarding support for IDN's in
Zend Framework. We could implement a class to convert Unicode strings to
Punycode in ASCII to support the way IDNA says to map IDN's. Then validate the
ASCII domain normally. Zend_Validate_Hostname could even do this transparently
if it detects any Unicode characters in its string argument. Since PHP 5 has
weak support for Unicode, this might not be something that can be done
transparently until PHP 6.
In the meantime, until ZF includes a Punycode converter, an application
developer must do it themselves and then validate the ASCII domain name.
Regards,
Bill Karwin
________________________________
From: Pádraic Brady [mailto:[EMAIL PROTECTED]
Sent: Saturday, June 23, 2007 11:33 AM
To: Zend Framework i18n; Zend Framework General
Subject: [fw-general] IDN Validation
Hi all,
I was just wondering what plans are for IDN support. We currently have
about 10? or less tlds covered in Zend_Validate - there's somewhere around 40+
currently supporting IDNs in total. This probably isn't a priority at the
moment - mainly curious since I had some test runs of an application meet some
failures from the validator.
On a sidetrack, how do IDNs effect the framework's email validator?
Bear in mind most of the tlds like .com, .org etc also allow for IDNs.
e.g. http://www.المعرفة.com
<http://www.%D8%A7%D9%84%D9%85%D8%B9%D8%B1%D9%81%D8%A9.com> (arabic).
Kind regards,
Pádraic
Pádraic Brady
http://blog.astrumfutura.com
http://www.patternsforphp.com
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