#17386: Validation & Unicode Character 'ZERO WIDTH SPACE' (U+200B)
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Reporter: pennersr | Owner: nobody
Type: Uncategorized | Status: new
Component: Forms | Version: 1.3
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by aaugustin):
Per [http://tools.ietf.org/html/rfc3696#section-2 RFC 3696], email
addresses can use non-ASCII characters:
> Any characters, or combination of bits (as octets), are permitted in DNS
names.
Names will be encoded with IDNA when an ASCII representation is required.
The `EmailValidator` takes this into account:
{{{
class EmailValidator(RegexValidator):
def __call__(self, value):
try:
super(EmailValidator, self).__call__(value)
except ValidationError, e:
# Trivial case failed. Try for possible IDN domain-part
if value and u'@' in value:
parts = value.split(u'@')
try:
parts[-1] = parts[-1].encode('idna')
except UnicodeError:
raise e
super(EmailValidator, self).__call__(u'@'.join(parts))
else:
raise
}}}
However, `\u200b` encodes to nothing with IDNA:
{{{
>>> u'-\u200b-'.encode('idna') == '--'
True
>>> len(u'-\u200b-'.encode('idna'))
2
}}}
I spent some time fighting with various online encoders and couldn't
confirm or infirm whether this is a valid result.
Anyway, that's the reason why the email address is valid, after IDNA
encoding of the domain part.
--
Ticket URL: <https://code.djangoproject.com/ticket/17386#comment:3>
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