Synnefo

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import re

from django.utils.translation import ugettext as _

from django.utils.encoding import smart_str

from django.utils.encoding import force_unicode as force_text

from django import forms

class EmailValidator(object):

    """

    Email validator. Backported from django 1.6

    """

    message = _('Enter a valid email address.')

    code = 'invalid'

    user_regex = re.compile(

        r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*$"  # dot-atom

        r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-\011\013\014\016-\177])*"$)', # quoted-string

        re.IGNORECASE)

    domain_regex = re.compile(

        r'(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}|[A-Z0-9-]{2,})$'  # domain

        # literal form, ipv4 address (SMTP 4.1.3)

        r'|^\[(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}\]$',

        re.IGNORECASE)

    domain_whitelist = ['localhost']

    def __init__(self, message=None, code=None, whitelist=None):

        if message is not None:

            self.message = message

        if code is not None:

            self.code = code

        if whitelist is not None:

            self.domain_whitelist = whitelist

    def __call__(self, value):

        value = force_text(value)

        if not value or '@' not in value:

            raise forms.ValidationError(self.message, code=self.code)

        user_part, domain_part = value.rsplit('@', 1)

        if not self.user_regex.match(user_part):

            raise forms.ValidationError(self.message, code=self.code)

        if (not domain_part in self.domain_whitelist and

                not self.domain_regex.match(domain_part)):

            # Try for possible IDN domain-part

            try:

                domain_part = domain_part.encode('idna').decode('ascii')

                if not self.domain_regex.match(domain_part):

                    raise forms.ValidationError(self.message, code=self.code)

                else:

                    return

            except UnicodeError:

                pass

            raise forms.ValidationError(self.message, code=self.code)

class EmailField(forms.EmailField):

    default_validators = [EmailValidator()]