Add option to raise an exception on validation error instead of returning a boolean

This commit is contained in:
Benjamin Renard 2019-09-10 13:51:37 +02:00
parent f0bd6d132d
commit 55cfd4a7de

View file

@ -14,6 +14,8 @@
# Website: https://gogs.zionetrix.net/bn8/mass_validate_email
# Licence: LGPL
""" Mass email addresses validation tools """
import smtplib
import socket
import sys
@ -28,17 +30,99 @@ except DNS.ServerError, err:
logging.fatal("Error discovering DNS servers : %s", err)
sys.exit(1)
# options
class OptionsClass(object):
# Exception
class EmailInvalid(Exception):
""" Generic invalid email exception """
def __init__(self):
self.debug = False
self.debugsmtp = False
self.checkmx = False
self.verifyaddress = False
self.usesmtpvrfy = False
self.refusemailifnotpermit = True
self.refuseontemporaryerror = True
def __init__(self, email, error_msg=None):
self.email = email
self.error_msg = error_msg or "Invalid email address"
super(EmailInvalid, self).__init__("%s : %s" % (email, self.error_msg))
class EmailInvalidSyntax(EmailInvalid):
""" Exception raised when an email address is invalid by syntax """
def __init__(self, email):
super(EmailInvalidSyntax, self).__init__(email, "Invalid email address syntax")
class EmailInvalidDomain(EmailInvalid):
""" Exceptiond raise when an email address is from an invalid mail domain """
def __init__(self, email, domain, cause):
self.domain = domain
self.cause = cause
super(EmailInvalidDomain, self).__init__(email, "Invalid email domain : %s" % domain)
class NoMXhostAvailable(EmailInvalid):
""" Exception raised when an email address is from a mail domain without available MX host """
def __init__(self, email, mx_hosts=None, mx_hosts_error=None):
self.mx_hosts = mx_hosts
self.mx_hosts_error = mx_hosts_error or {}
if mx_hosts_error:
super(NoMXhostAvailable, self).__init__(email, "No MX hosts available : %s" % ', '.join([mx_hosts_error[host].error_msg for host in mx_hosts_error]))
else:
super(NoMXhostAvailable, self).__init__(email, "No MX hosts available")
class EmailRefused(EmailInvalid):
""" Exception raised when an email address is refused by the MX host """
def __init__(self, email, mx_host=None):
self.mx_hosts = mx_host
if mx_host:
super(EmailRefused, self).__init__(email, "MX host %s refused this email" % mx_host)
else:
super(EmailRefused, self).__init__(email, "MX hosts refused this email")
class MXUnavailable(EmailInvalid):
""" Exception raised when an MX host is not available to validate an email address """
def __init__(self, email, mx_host, error_msg=None):
self.mx_host = mx_host
super(MXUnavailable, self).__init__(email, error_msg or "%s : MX host %s unavailable" % (email, mx_host))
class TemporaryErrorOnMX(MXUnavailable):
""" Exception raised when an MX host raise a temporary error validating an email address """
def __init__(self, email, mx_host, msg=None):
self.msg = msg
if msg:
error_msg = "%s : temporary error occured on MX host %s : %s" % (email, mx_host, msg)
else:
error_msg = "%s : temporary error occured on MX host %s" % (email, mx_host)
super(TemporaryErrorOnMX, self).__init__(email, mx_host, error_msg)
class MXRefuseConnection(MXUnavailable):
""" Exception raised when an MX host refuse connection validating an email address """
def __init__(self, email, mx_host, msg=None):
self.msg = msg
if msg:
error_msg = "%s : MX host %s refuse connection : %s" % (email, mx_host, msg)
else:
error_msg = "%s : MX host %s refuse connection" % (email, mx_host)
super(MXRefuseConnection, self).__init__(email, mx_host, error_msg)
# Options
class OptionsClass(object):
""" Class used to defined validation options """
debug = False
debugsmtp = False
checkmx = False
verifyaddress = False
usesmtpvrfy = False
acceptoncnxrefused = False
acceptontemporaryerror = False
raiseonerror = False
options = OptionsClass()
@ -49,82 +133,101 @@ def clean_mail(mail):
mail = str(mail).lower().strip()
return mail
# Cache domain info
domain_mx = {}
valid_domain = []
invalid_domain = []
def check_mx(mail):
dom = mail[mail.find('@')+1:]
if not options.verifyaddress:
if dom in valid_domain:
return True
elif dom in invalid_domain:
return False
else:
# Domains's MX hosts
domains_mx_hosts = {}
# List of valid domains
valid_domains = []
# List of invalid domains (with invalid cause)
invalid_domains = {}
# List of domain without available MX host (with unavailable cause)
mx_unavailable_domain = {}
def get_mail_domain_and_mx_hosts(mail):
""" Retreive domain name and it's MX hosts from an email address """
domain = mail[mail.find('@')+1:]
if domain in domains_mx_hosts:
return (domain, domains_mx_hosts[domain])
if domain in invalid_domains:
if options.raiseonerror:
raise EmailInvalidDomain(mail, domain, invalid_domains[domain])
return (domain, False)
try:
mx_hosts = DNS.mxlookup(dom)
if len(mx_hosts) > 0:
domain_mx[dom] = []
for mx_host in mx_hosts:
domain_mx[dom].append(mx_host[1])
logging.debug("MX of domain %s : %s", dom, ','.join(domain_mx[dom]))
valid_domain.append(dom)
return True
elif connect_to_mx(dom):
domain_mx[dom] = [dom]
logging.debug("MX of domain %s : %s", dom, ','.join(domain_mx[dom]))
valid_domain.append(dom)
return True
else:
logging.debug("No valid MX of domain %s found", dom)
invalid_domain.append(dom)
return False
# Retreive domain's MX hosts info
mx_hosts_info = DNS.mxlookup(domain)
if len(mx_hosts_info) > 0:
domains_mx_hosts[domain] = [mx_host_info[1] for mx_host_info in mx_hosts_info]
logging.debug("MX of domain %s : %s", domain, ','.join(domains_mx_hosts[domain]))
valid_domains.append(domain)
return (domain, domains_mx_hosts[domain])
# If domain have no MX hosts, try on domain name it self
if connect_to_mx(domain):
domains_mx_hosts[domain] = [domain]
logging.debug("MX of domain %s : %s", domain, ','.join(domains_mx_hosts[domain]))
valid_domains.append(domain)
return (domain, domains_mx_hosts[domain])
# No valid MX host found for this domain
logging.debug("No valid MX of domain %s found", domain)
invalid_domains[domain] = "No valid MX hosts found"
except DNS.ServerError, err:
logging.debug('Error getting MX servers of domain %s : %s', dom, err)
invalid_domain.append(dom)
logging.debug('Error getting MX servers of domain %s : %s', domain, err)
invalid_domains[domain] = 'DNS server error getting MX hosts : %s' % err
if options.raiseonerror:
raise EmailInvalidDomain(mail, domain, invalid_domains[domain])
return (domain, False)
def check_mx(mail):
""" MX check of an email address """
domain, mx_hosts = get_mail_domain_and_mx_hosts(mail)
if not mx_hosts:
return False
else:
if dom in invalid_domain:
if not options.verifyaddress:
# We don't have to connect on MX host : just check if domain have at least on MX host
return bool(mx_hosts)
if domain in mx_unavailable_domain:
if options.raiseonerror:
raise NoMXhostAvailable(mail, mx_hosts, mx_unavailable_domain[domain])
return False
if dom in domain_mx:
for mx_host in domain_mx[dom]:
# Check mail on MX hosts
no_mx_available = True
mx_unavailable_errors = []
for mx_host in mx_hosts:
con = connect_to_mx(mx_host)
if not con:
mx_unavailable_errors[mx_host] = "%s : Fail to connect on MX host" % mx_host
continue
if check_mail_on_mx(dom, con, mail, if_not_permit=(not options.refusemailifnotpermit)):
return True
return False
else:
no_mx_available = False
try:
mx_hosts = DNS.mxlookup(dom)
if len(mx_hosts) > 0:
domain_mx[dom] = []
for mx_host in mx_hosts:
domain_mx[dom].append(mx_host[1])
valid_domain.append(dom)
return check_mx(mail)
else:
# Directly check MX and mail
con = connect_to_mx(dom)
if not con:
invalid_domain.append(dom)
if verify_mail_on_mx_host(domain, con, mail, accept_on_cnx_refused=options.acceptoncnxrefused):
return True
except EmailRefused:
if options.raiseonerror:
raise
return False
domain_mx[dom] = [dom]
return check_mail_on_mx(dom, con, mail, if_not_permit=(not options.refusemailifnotpermit))
except DNS.ServerError, err:
logging.debug('Error getting MX servers of domain %s : %s', dom, err)
invalid_domain.append(dom)
except MXUnavailable as err:
mx_unavailable_errors[mx_host] = err
if no_mx_available:
mx_unavailable_domain[domain] = mx_unavailable_errors
if options.raiseonerror:
raise NoMXhostAvailable(mail, mx_hosts, mx_unavailable_domain[domain])
elif options.raiseonerror:
raise EmailRefused(mail)
return False
valid_mx = []
invalid_mx = []
def verify_mx(mx_host, mail, check_mail=False):
if not check_mail and mx_host in valid_mx:
return True
elif not check_mail and mx_host in invalid_mx:
return False
def connect_to_mx(mx_host):
""" Connect on a MX host and return the smtplib corresponding connection object """
if mx_host in invalid_mx:
return False
try:
@ -149,18 +252,26 @@ def connect_to_mx(mx_host):
invalid_mx.append(mx_host)
return None
mx_refuse_check_mail = []
def check_mail_on_mx(mx_host, smtp, mail, if_not_permit=False):
mx_refuse_check_mail = {}
def verify_mail_on_mx_host(mx_host, smtp, mail, accept_on_cnx_refused=False):
""" Verify an email address on a specific MX host """
if mx_host in mx_refuse_check_mail:
return if_not_permit
if accept_on_cnx_refused:
logging.debug('%s : MX host %s refused connection but consider email as validated', mail, mx_host)
return True
raise MXRefuseConnection(mail, mx_host, mx_refuse_check_mail[mx_host])
try:
status, _ = smtp.helo()
status, msg = smtp.helo()
if status != 250:
mx_refuse_check_mail.append(mx_host)
return if_not_permit
mx_refuse_check_mail[mx_host] = msg
if accept_on_cnx_refused:
logging.debug('%s : MX host %s refused connection but consider email as validated', mail, mx_host)
return True
raise MXRefuseConnection(mail, mx_host, msg)
if options.usesmtpvrfy:
(status, msg) = smtp.verify(mail)
logging.debug('%s : MX host %s return the code %s on VRFY command with the following message : %s', mail, mx_host, status, msg)
if status >= 250 and status < 260:
# Server normaly return an normalize email address
for word in msg.split(' '):
@ -170,20 +281,32 @@ def check_mail_on_mx(mx_host, smtp, mail, if_not_permit=False):
status, msg = smtp.rcpt(mail)
if status >= 400 and status < 500:
logging.debug('SMTP server return temporary error (code=%s) : %s', status, msg)
return not options.refuseontemporaryerror
if options.acceptontemporaryerror:
logging.debug('%s : MX host %s raise a temporary error but consider email as validated', mail, mx_host)
return True
raise TemporaryErrorOnMX(mail, mx_host, msg)
elif status != 250:
if options.raiseonerror:
raise EmailRefused(mail, mx_host)
return False
logging.debug('%s : MX host %s accept email for this address with the following message : %s', mail, mx_host, msg)
return True
except smtplib.SMTPServerDisconnected:
# Server not permits verify user
mx_refuse_check_mail.append(mx_host)
return if_not_permit
mx_refuse_check_mail[mx_host] = "server disconnected during the exchange"
if accept_on_cnx_refused:
logging.debug('%s : MX host %s refused connection but consider email as validated', mail, mx_host)
return True
raise MXRefuseConnection(mail, mx_host, mx_refuse_check_mail[mx_host])
except smtplib.SMTPConnectError:
return False
raise MXUnavailable(mail, mx_host)
def mass_validate_email(mail, simple=False):
""" Validate an email address with mecanisms optimized for mass email addresses validation """
mail = clean_mail(mail)
if not validate_email(mail):
if options.raiseonerror:
raise EmailInvalidSyntax(mail)
return
elif simple:
return True
@ -248,15 +371,15 @@ if __name__ == '__main__':
help="When MX check is enabled, enable the SMPT VRFY command usage"
)
parser.add_option(
'--accept-mail-if-not-permit',
action="store_false",
dest="refusemailifnotpermit",
'--accept-email-on-cnx-refused',
action="store_true",
dest="acceptoncnxrefused",
help="When MX check is enabled, accept email address even if MX server refuse the SMTP connection (after HELO command)"
)
parser.add_option(
'--accept-on-temporary-error',
action="store_false",
dest="refuseontemporaryerror",
action="store_true",
dest="acceptontemporaryerror",
help="When MX check is enabled, accept email address even if MX server return a temporary error (after trying to send an email to the checked address)"
)
parser.add_option(
@ -295,12 +418,13 @@ if __name__ == '__main__':
parser.error('You must specify emails address as arguments')
# Configure other options from command line arguments
options.raiseonerror = True
options.debugsmtp = opts.debugsmtp
options.checkmx = opts.checkmx or opts.verifyaddress or opts.usesmtpvrfy
options.verifyaddress = opts.verifyaddress
options.usesmtpvrfy = opts.usesmtpvrfy
options.refusemailifnotpermit = opts.refusemailifnotpermit
options.refuseontemporaryerror = opts.refuseontemporaryerror
options.acceptoncnxrefused = opts.acceptoncnxrefused
options.acceptontemporaryerror = opts.acceptontemporaryerror
if opts.progress:
from progressbar import ProgressBar, Percentage, Bar, RotatingMarker, SimpleProgress, ETA
@ -322,14 +446,17 @@ if __name__ == '__main__':
logging.info('Start emails addresses validation')
validated = []
not_validated = []
not_validated = {}
for email in emails:
try:
if mass_validate_email(email):
logging.info('Address %s is valid', email)
validated.append(email)
else:
logging.info('Address %s is NOT valid', email)
not_validated.append(email)
logging.info('Address %s is NOT valid, but no exception raised : it is not supose to happen !', email)
not_validated[email] = EmailInvalid(email)
except EmailInvalid as err:
not_validated[email] = err
if opts.progress:
pbar_count += 1
pbar.update(pbar_count)
@ -338,6 +465,9 @@ if __name__ == '__main__':
pbar.finish()
if not_validated:
logging.warning('%s on %s is NOT valid :\n- %s', len(not_validated), len(emails), '\n- '.join(not_validated))
logging.warning('%s on %s is NOT valid :\n- %s', len(not_validated), len(emails), '\n- '.join([str(not_validated[email]) for email in not_validated]))
else:
logging.info('All %s emails addresses provided are valid.', len(emails))
# Adapt exit code on validation result
sys.exit(1 if not_validated else 0)