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# coding:utf-8
'''
Email address validation plugin for aol.com email addresses.
Notes:
3-32 characters
must start with letter
must end with letter or number
must use letters, numbers, dot (.) or underscores (_)
no consecutive dot (.) or underscores (_)
no dot-underscore (._) or underscore-dot (_.)
case is ignored
Grammar:
local-part -> alpha { [ dot | underscore ] ( alpha | num ) }
'''
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)
NUMERIC = re.compile(r'''
( [0-9]
)+
''',
re.MULTILINE | re.VERBOSE)
ALPHANUM = re.compile(r'''
( [A-Za-z0-9]
| {unicode_char}
)+
'''.format(unicode_char=_UNICODE_CHAR),
re.MULTILINE | re.VERBOSE)
DOT = '.'
UNDERSCORE = '_'
AOL_UNMANAGED = ['verizon.net']
def validate(email_addr):
# Setup for handling EmailAddress type instead of literal string
localpart = email_addr.mailbox
unmanaged = unmanaged_email(email_addr.hostname)
# check string exists and not empty
if not localpart:
return False
# Unmanaged is now a list of providers whom patterns/rules are unknown
# thus any hostname part matching will return without rule adherence.
if unmanaged:
return True
# length check
l = len(localpart)
if l < 3 or l > 32:
return False
# must start with letter
if ALPHA.match(localpart[0]) is None:
return False
# must end with letter or digit
if ALPHANUM.match(localpart[-1]) is None:
return False
# grammar check
return _validate(localpart)
def _validate(localpart):
"Grammar: local-part -> alpha { [ dot | underscore ] ( alpha | num ) }"
stream = TokenStream(localpart)
# local-part must being with alpha
alpa = stream.get_token(ALPHA)
if alpa is None:
return False
while True:
# optional dot or underscore token
stream.get_token(DOT) or stream.get_token(UNDERSCORE)
# alpha or numeric
alpanum = stream.get_token(ALPHA) or stream.get_token(NUMERIC)
if alpanum is None:
break
# alpha or numeric must be end of stream
if not stream.end_of_stream():
return False
return True
def unmanaged_email(hostname):
return hostname in AOL_UNMANAGED
|
