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# coding:utf-8
'''
Email address validation plugin for Google Apps email addresses.
Notes:
must be between 1-64 characters
must use letters, numbers, dash (-), underscore (_), apostrophes ('), and dots (.)
if one character, must be alphanum, underscore (_) or apostrophes (')
otherwise must start with: alphanum, underscore (_), dash (-), or apostrophes(')
otherwise must end with: alphanum, underscore(_), dash(-), or apostrophes(')
plus (+) is allowed, everything after + is ignored
case is ignored
Grammar:
local-part -> main-part [ tags ]
main-part -> google-prefix google-root google-suffix
tags -> { + [ atom ] }
google-prefix -> alphanum | underscore | dash | apostrophe
google-root -> alphanum | underscore | dash | apostrophe | dots
google-suffix -> alphanum | underscore | dash | apostrophe
Other limitations:
1. All characters prefixing the plus symbol (+) must be between 1-64 characters.
'''
import re
from flanker.addresslib.plugins._tokenizer import TokenStream
from flanker.addresslib._parser.lexer import t_ATOM, _UNICODE_CHAR
ATOM = re.compile(t_ATOM, re.MULTILINE | re.VERBOSE)
GOOGLE_BASE = re.compile(r'''
( [A-Za-z0-9_\-'\.]
| {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)
APOSTROPHE = re.compile(r'''
\'
''',
re.MULTILINE | re.VERBOSE)
UNDERSCORE = re.compile(r'\_', re.MULTILINE | re.VERBOSE)
DASH = re.compile(r'\-', re.MULTILINE | re.VERBOSE)
DOTS = '.'
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
lparts = localpart.split('+')
real_localpart = lparts[0]
# length check
l = len(real_localpart)
if l < 0 or l > 64:
return False
# if only one character, must be alphanum, underscore (_), or apostrophe (')
if len(localpart) == 1 or l == 1:
if ALPHANUM.match(localpart) or UNDERSCORE.match(localpart) or \
APOSTROPHE.match(localpart):
return True
return False
# must start with: alphanum, underscore (_), dash (-), or apostrophe(')
if len(real_localpart) > 0:
if not ALPHANUM.match(real_localpart[0]) and not UNDERSCORE.match(real_localpart[0]) \
and not DASH.match(real_localpart[0]) and not APOSTROPHE.match(real_localpart[0]):
return False
else:
return False
# must end with: alphanum, underscore(_), dash(-), or apostrophe(')
if not ALPHANUM.match(real_localpart[-1]) and not UNDERSCORE.match(real_localpart[-1]) \
and not DASH.match(real_localpart[-1]) and not APOSTROPHE.match(real_localpart[-1]):
return False
# grammar check
return _validate(real_localpart)
def _validate(localpart):
stream = TokenStream(localpart)
# get the google base
mpart = stream.get_token(GOOGLE_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):
while True:
# plus sign
pls = stream.get_token(PLUS)
# optional atom
if pls:
stream.get_token(ATOM)
else:
break
return True
|
