124 lines
5.8 KiB
Python
124 lines
5.8 KiB
Python
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# RFC 2822 - style email validation for Python
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# (c) 2012 Syrus Akbary <me@syrusakbary.com>
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# Extended from (c) 2011 Noel Bush <noel@aitools.org>
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# for support of mx and user check
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# This code is made available to you under the GNU LGPL v3.
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#
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# This module provides a single method, valid_email_address(),
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# which returns True or False to indicate whether a given address
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# is valid according to the 'addr-spec' part of the specification
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# given in RFC 2822. Ideally, we would like to find this
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# in some other library, already thoroughly tested and well-
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# maintained. The standard Python library email.utils
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# contains a parse_addr() function, but it is not sufficient
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# to detect many malformed addresses.
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#
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# This implementation aims to be faithful to the RFC, with the
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# exception of a circular definition (see comments below), and
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# with the omission of the pattern components marked as "obsolete".
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import re
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import smtplib
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import socket
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try:
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import DNS
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ServerError = DNS.ServerError
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except:
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DNS = None
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class ServerError(Exception): pass
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# All we are really doing is comparing the input string to one
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# gigantic regular expression. But building that regexp, and
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# ensuring its correctness, is made much easier by assembling it
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# from the "tokens" defined by the RFC. Each of these tokens is
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# tested in the accompanying unit test file.
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#
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# The section of RFC 2822 from which each pattern component is
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# derived is given in an accompanying comment.
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#
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# (To make things simple, every string below is given as 'raw',
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# even when it's not strictly necessary. This way we don't forget
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# when it is necessary.)
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#
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WSP = r'[ \t]' # see 2.2.2. Structured Header Field Bodies
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CRLF = r'(?:\r\n)' # see 2.2.3. Long Header Fields
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NO_WS_CTL = r'\x01-\x08\x0b\x0c\x0f-\x1f\x7f' # see 3.2.1. Primitive Tokens
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QUOTED_PAIR = r'(?:\\.)' # see 3.2.2. Quoted characters
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FWS = r'(?:(?:' + WSP + r'*' + CRLF + r')?' + \
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WSP + r'+)' # see 3.2.3. Folding white space and comments
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CTEXT = r'[' + NO_WS_CTL + \
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r'\x21-\x27\x2a-\x5b\x5d-\x7e]' # see 3.2.3
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CCONTENT = r'(?:' + CTEXT + r'|' + \
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QUOTED_PAIR + r')' # see 3.2.3 (NB: The RFC includes COMMENT here
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# as well, but that would be circular.)
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COMMENT = r'\((?:' + FWS + r'?' + CCONTENT + \
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r')*' + FWS + r'?\)' # see 3.2.3
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CFWS = r'(?:' + FWS + r'?' + COMMENT + ')*(?:' + \
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FWS + '?' + COMMENT + '|' + FWS + ')' # see 3.2.3
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ATEXT = r'[\w!#$%&\'\*\+\-/=\?\^`\{\|\}~]' # see 3.2.4. Atom
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ATOM = CFWS + r'?' + ATEXT + r'+' + CFWS + r'?' # see 3.2.4
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DOT_ATOM_TEXT = ATEXT + r'+(?:\.' + ATEXT + r'+)*' # see 3.2.4
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DOT_ATOM = CFWS + r'?' + DOT_ATOM_TEXT + CFWS + r'?' # see 3.2.4
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QTEXT = r'[' + NO_WS_CTL + \
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r'\x21\x23-\x5b\x5d-\x7e]' # see 3.2.5. Quoted strings
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QCONTENT = r'(?:' + QTEXT + r'|' + \
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QUOTED_PAIR + r')' # see 3.2.5
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QUOTED_STRING = CFWS + r'?' + r'"(?:' + FWS + \
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r'?' + QCONTENT + r')*' + FWS + \
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r'?' + r'"' + CFWS + r'?'
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LOCAL_PART = r'(?:' + DOT_ATOM + r'|' + \
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QUOTED_STRING + r')' # see 3.4.1. Addr-spec specification
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DTEXT = r'[' + NO_WS_CTL + r'\x21-\x5a\x5e-\x7e]' # see 3.4.1
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DCONTENT = r'(?:' + DTEXT + r'|' + \
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QUOTED_PAIR + r')' # see 3.4.1
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DOMAIN_LITERAL = CFWS + r'?' + r'\[' + \
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r'(?:' + FWS + r'?' + DCONTENT + \
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r')*' + FWS + r'?\]' + CFWS + r'?' # see 3.4.1
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DOMAIN = r'(?:' + DOT_ATOM + r'|' + \
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DOMAIN_LITERAL + r')' # see 3.4.1
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ADDR_SPEC = LOCAL_PART + r'@' + DOMAIN # see 3.4.1
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# A valid address will match exactly the 3.4.1 addr-spec.
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VALID_ADDRESS_REGEXP = '^' + ADDR_SPEC + '$'
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def validate_email(email, check_mx=False,verify=False):
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"""Indicate whether the given string is a valid email address
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according to the 'addr-spec' portion of RFC 2822 (see section
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3.4.1). Parts of the spec that are marked obsolete are *not*
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included in this test, and certain arcane constructions that
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depend on circular definitions in the spec may not pass, but in
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general this should correctly identify any email address likely
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to be in use as of 2011."""
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try:
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assert re.match(VALID_ADDRESS_REGEXP, email) is not None
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check_mx |= verify
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if check_mx:
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if not DNS: raise Exception('For check the mx records or check if the email exists you must have installed pyDNS python package')
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DNS.DiscoverNameServers()
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hostname = email[email.find('@')+1:]
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mx_hosts = DNS.mxlookup(hostname)
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for mx in mx_hosts:
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try:
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smtp = smtplib.SMTP()
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smtp.connect(mx[1])
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if not verify: return True
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status, _ = smtp.helo()
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if status != 250: continue
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smtp.mail('')
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status, _ = smtp.rcpt(email)
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if status != 250: return False
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break
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except smtplib.SMTPServerDisconnected: #Server not permits verify user
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break
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except smtplib.SMTPConnectError:
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continue
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except (AssertionError, ServerError):
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return False
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return True
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# import sys
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# sys.modules[__name__],sys.modules['validate_email_module'] = validate_email,sys.modules[__name__]
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# from validate_email_module import *
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