import re import dns.resolver from pubsublogger import publisher from datetime import timedelta def is_luhn_valid(card_number): """Apply the Luhn algorithm to validate credit card. :param card_number: -- (int) card number """ r = [int(ch) for ch in str(card_number)][::-1] return (sum(r[0::2]) + sum(sum(divmod(d*2, 10)) for d in r[1::2])) % 10 == 0 def checking_MX_record(r_serv, adress_set, addr_dns): """Check if emails MX domains are responding. :param r_serv: -- Redis connexion database :param adress_set: -- (set) This is a set of emails adress :param adress_set: -- (str) This is a server dns address :return: (int) Number of adress with a responding and valid MX domains This function will split the email adress and try to resolve their domains names: on example@gmail.com it will try to resolve gmail.com """ #remove duplicate adress_set = list(set(adress_set)) score = 0 num = len(adress_set) WalidMX = set([]) # Transforming the set into a string MXdomains = re.findall("@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,20}", str(adress_set).lower()) resolver = dns.resolver.Resolver() resolver.nameservers = [addr_dns] resolver.timeout = 5 resolver.lifetime = 2 if MXdomains != []: for MXdomain in set(MXdomains): try: # Already in Redis living. if r_serv.exists(MXdomain[1:]): score += 1 WalidMX.add(MXdomain[1:]) # Not already in Redis else: # If I'm Walid MX domain if resolver.query(MXdomain[1:], rdtype=dns.rdatatype.MX): # Gonna be added in redis. r_serv.setex(MXdomain[1:], 1, timedelta(days=1)) score += 1 WalidMX.add(MXdomain[1:]) else: pass except dns.resolver.NoNameservers: publisher.debug('NoNameserver, No non-broken nameservers are available to answer the query.') print('NoNameserver, No non-broken nameservers are available to answer the query.') except dns.resolver.NoAnswer: publisher.debug('NoAnswer, The response did not contain an answer to the question.') print('NoAnswer, The response did not contain an answer to the question.') except dns.name.EmptyLabel: publisher.debug('SyntaxError: EmptyLabel') print('SyntaxError: EmptyLabel') except dns.resolver.NXDOMAIN: r_serv.setex(MXdomain[1:], 1, timedelta(days=1)) publisher.debug('The query name does not exist.') print('The query name does not exist.') except dns.name.LabelTooLong: publisher.debug('The Label is too long') print('The Label is too long') except dns.resolver.Timeout: print('timeout') r_serv.setex(MXdomain[1:], 1, timedelta(days=1)) except Exception as e: print(e) publisher.debug("emails before: {0} after: {1} (valid)".format(num, score)) return (num, WalidMX) def checking_A_record(r_serv, domains_set): score = 0 num = len(domains_set) WalidA = set([]) resolver = dns.resolver.Resolver() resolver.nameservers = ['149.13.33.69'] resolver.timeout = 5 resolver.lifetime = 2 for Adomain in domains_set: try: # Already in Redis living. if r_serv.exists(Adomain): score += 1 WalidA.add(Adomain) # Not already in Redis else: # If I'm Walid domain if resolver.query(Adomain, rdtype=dns.rdatatype.A): # Gonna be added in redis. r_serv.setex(Adomain, 1, timedelta(days=1)) score += 1 WalidA.add(Adomain) else: pass except dns.resolver.NoNameservers: publisher.debug('NoNameserver, No non-broken nameservers are available to answer the query.') except dns.resolver.NoAnswer: publisher.debug('NoAnswer, The response did not contain an answer to the question.') except dns.name.EmptyLabel: publisher.debug('SyntaxError: EmptyLabel') except dns.resolver.NXDOMAIN: r_serv.setex(Adomain[1:], 1, timedelta(days=1)) publisher.debug('The query name does not exist.') except dns.name.LabelTooLong: publisher.debug('The Label is too long') except Exception as e: print(e) publisher.debug("URLs before: {0} after: {1} (valid)".format(num, score)) return (num, WalidA)