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[Bug 15489] IDN email addresses should be converted to Punycode before validating them

From: <bugzilla@jessica.w3.org>
Date: Thu, 09 Feb 2012 09:50:11 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1RvQdn-0004S1-1i@jessica.w3.org>

--- Comment #13 from Mathias Bynens <mathias@qiwi.be> 2012-02-09 09:50:09 UTC ---
> The markup is invalid, regardless of what the user does.

Note to self:
(this was new to me)

> > Let’s say Page A has the following markup. After submission the input is
> > inserted into a database.
> > 
> >     <input type=text name=email>
> >     <!-- or even a typo, which makes it fall back to type=text… -->
> >     <input type=e-mail name=email>
> Then, if the user enters an IDN address, and the server doesn't validate its
> input (!), the server will be in a state where if it tries to send mail, it
> will fail.

This assumes that the mail server / client can’t handle IDN email addresses.

> > Page B uses type=email, and reads the value from the database:
> > 
> >     <input type=email value=foo@mañana.com>
> This means the server is non-conforming, as it outputs invalid HTML.

This bug is about making it conforming.

> > Alternatively, the un-Punycoded email address may already be stored in the
> > database for a variety of reasons.
> Like what?

You could have imported a database (say, contact details of all your clients)
from a desktop app that allowed IDN emails.

This restriction in the spec forces web developers to implement their own
Punycode encoder on the back-end, even though browsers already have one
built-in. By lifting this restriction, authors would only need to validate the
email addresses on input in the back-end (as is the case anyway).

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Received on Thursday, 9 February 2012 09:50:16 UTC

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