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|
# coding:utf-8
'''
Email address validation plugin for icloud.com email addresses.
Notes:
3-20 characters
must start with letter
must end with letter or number
must use letters, numbers, dot (.) or underscores (_)
no consecutive dot (.) or underscores (_)
case is ignored
any number of plus (+) are allowed if followed by at least one alphanum
Grammar:
local-part -> icloud-prefix { [ dot | underscore ] icloud-root }
icloud-suffix
icloud-prefix = alpha
icloud-root = alpha | num | plus
icloud-suffix = alpha | num
Other limitations:
* Length of local-part must be no more than 20 characters, and no
less than 3 characters.
Open questions:
* Are dot-underscore (._) or underscore-dot (_.) allowed?
* Is name.@icloud.com allowed?
'''
import re
from flanker.addresslib.plugins._tokenizer import TokenStream
from flanker.addresslib._parser.lexer import _UNICODE_CHAR
ALPHA = re.compile(r'''
( [A-Za-z]
| {unicode_char}
)+
'''.format(unicode_char=_UNICODE_CHAR),
re.MULTILINE | re.VERBOSE)
ALPHANUM = re.compile(r'''
( [A-Za-z0-9]
| {unicode_char}
)+
'''.format(unicode_char=_UNICODE_CHAR),
re.MULTILINE | re.VERBOSE)
ICLOUD_BASE = re.compile(r'''
( [A-Za-z0-9\+]
| {unicode_char}
)+
'''.format(unicode_char=_UNICODE_CHAR),
re.MULTILINE | re.VERBOSE)
DOT = '.'
UNDERSCORE = '_'
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
lparts = localpart.split('+')
real_localpart = lparts[0]
# length check
l = len(real_localpart)
if l < 3 or l > 20:
return False
# can not end with +
if localpart[-1] == '+':
return False
# must start with letter
if ALPHA.match(real_localpart[0]) is None:
return False
# must end with letter or digit
if ALPHANUM.match(real_localpart[-1]) is None:
return False
# check grammar
return _validate(real_localpart)
def _validate(localpart):
stream = TokenStream(localpart)
# localpart must start with alpha
alpa = stream.get_token(ALPHA)
if alpa is None:
return False
while True:
# optional dot or underscore
stream.get_token(DOT) or stream.get_token(UNDERSCORE)
base = stream.get_token(ICLOUD_BASE)
if base is None:
break
if not stream.end_of_stream():
return False
return True
|
