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# coding:utf-8
'''
Email address validation plugin for hotmail.com email addresses.
Notes:
1-64 characters
must start with letter or number
must end with letter, number, hyphen (-), or underscore (_)
must use letters, numbers, periods (.), hypens (-), or underscores (_)
only one plus (+) is allowed
case is ignored
Grammar:
local-part -> main-part [ tags ]
main-part -> hotmail-prefix hotmail-root hotmail-suffix
hotmail-prefix -> alpha | number
hotmail-root -> alpha | number | period | hyphen | underscore
hotmail-suffix -> alpha | number | hyphen | underscore
tags -> + [ hotmail-root ]
Other limitations:
1. Only one consecutive period (.) is allowed in the local-part
2. Length of local-part must be no more than 64 characters, and no
less than 1 characters.
'''
import re
from flanker.addresslib.plugins._tokenizer import TokenStream
from flanker.addresslib._parser.lexer import _UNICODE_CHAR
HOTMAIL_PREFIX = re.compile(r'''
( [A-Za-z0-9]
| {unicode_char}
)+
'''.format(unicode_char=_UNICODE_CHAR),
re.MULTILINE | re.VERBOSE)
HOTMAIL_BASE = re.compile(r'''
( [A-Za-z0-9\.\-\_]
| {unicode_char}
)+
'''.format(unicode_char=_UNICODE_CHAR),
re.MULTILINE | re.VERBOSE)
HOTMAIL_SUFFIX = re.compile(r'''
( [A-Za-z0-9\-\_]
| {unicode_char}
)+
'''.format(unicode_char=_UNICODE_CHAR),
re.MULTILINE | re.VERBOSE)
PLUS = '+'
def validate(email_addr):
# Setup for handling EmailAddress type instead of literal string
localpart = email_addr.mailbox
# check string exists and not empty
if not localpart:
return False
# remove tag if it exists
lparts = localpart.split('+')
real_localpart = lparts[0]
# length check
l = len(real_localpart)
if l < 1 or l > 64:
return False
# start can only be alphanumeric
if HOTMAIL_PREFIX.match(real_localpart[0]) is None:
return False
# can not end with dot
if HOTMAIL_SUFFIX.match(real_localpart[-1]) is None:
return False
# no more than one plus (+)
if localpart.count('+') > 1:
return False
# grammar check
retval = _validate(real_localpart)
return retval
def _validate(localpart):
stream = TokenStream(localpart)
# get the hotmail base
mpart = stream.get_token(HOTMAIL_BASE)
if mpart is None:
return False
# optional tags
tgs = _tags(stream)
if not stream.end_of_stream():
return False
return True
def _tags(stream):
pls = stream.get_token(PLUS)
bse = stream.get_token(HOTMAIL_BASE)
if bse and pls is None:
return False
return True
|
