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findspam.py
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findspam.py
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# -*- coding: utf-8 -*-
# noinspection PyCompatibility
import sys
import math
from difflib import SequenceMatcher
from urllib.parse import urlparse, unquote_plus
from itertools import chain
from collections import Counter
from datetime import datetime
from string import punctuation
import time
import os
import os.path as path
import threading
import regex
# noinspection PyPackageRequirements
import tld
# noinspection PyPackageRequirements
from tld.utils import TldDomainNotFound
import phonenumbers
import dns.resolver
import requests
import chatcommunicate
from helpers import log, regex_compile_no_cache, strip_pre_and_code_elements, strip_code_elements
import metasmoke_cache
from globalvars import GlobalVars
import blacklists
import phone_numbers
if tuple(int(x) for x in regex.__version__.split('.')) < (2, 5, 82):
raise ImportError(
'Need regex >= 2020.6.8 (internal version number 2.5.82; got %s)' %
regex.__version__)
LINK_CACHE = dict()
LINK_CACHE_lock = threading.RLock()
LEVEN_DOMAIN_DISTANCE = 3
SIMILAR_THRESHOLD = 0.95
SIMILAR_ANSWER_THRESHOLD = 0.7
BODY_TITLE_SIMILAR_RATIO = 0.90
CHARACTER_USE_RATIO = 0.42
PUNCTUATION_RATIO = 0.42
REPEATED_CHARACTER_RATIO = 0.20
IMG_TXT_R_THRES = 0.7
EXCEPTION_RE = r"^Domain (.*) didn't .*!$"
RE_COMPILE = regex_compile_no_cache(EXCEPTION_RE)
COMMON_MALFORMED_PROTOCOLS = [
('httl://', 'http://'),
]
# These types of files frequently get caught as "misleading link"
SAFE_EXTENSIONS = {'htm', 'py', 'java', 'sh'}
SE_SITES_RE = r'(?:{sites})'.format(
sites='|'.join([
r'(?:[a-z]+\.)*stackoverflow\.com',
r'(?:{doms})\.com'.format(doms='|'.join(
[r'askubuntu', r'superuser', r'serverfault', r'stackapps', r'imgur'])),
r'mathoverflow\.net',
r'i\.sstatic\.net',
r'(?:[a-z]+\.)*stackexchange\.com']))
SE_SITES_DOMAINS = ['stackoverflow.com', 'askubuntu.com', 'superuser.com', 'serverfault.com',
'mathoverflow.net', 'stackapps.com', 'stackexchange.com', 'sstatic.net',
'imgur.com', 'sstatic.net'] # Frequently catching FP
WHITELISTED_WEBSITES_REGEX = regex_compile_no_cache(r"(?i)upload|\b(?:{})\b".format("|".join([
"yfrog", "gfycat", "tinypic", "sendvid", "ctrlv", "prntscr", "gyazo", r"youtu\.?be", "past[ie]", "dropbox",
"microsoft", "newegg", "cnet", "regex101", r"(?<!plus\.)google", "localhost", "ubuntu", "getbootstrap",
r"jsfiddle\.net", r"codepen\.io", "pastebin", r"nltk\.org", r"xahlee\.info", r"ergoemacs\.org", "regexr"
] + [se_dom.replace(".", r"\.") for se_dom in SE_SITES_DOMAINS])))
URL_SHORTENER_REGEX_FRAGMENT = r"(?:{})".format('|'.join(regex.escape(site) for site in (
'0i.is', '1b.yt', '1th.me', '92q.com', '9nl.me', 'adf.ly', 'adfoc.us', 'adyou.co',
'alturl.com', 'amzn.to', 'bfy.tw', 'bit.do', 'bit.ly', 'bluenik.com', 'buff.ly',
'ckk.ai', 'cl.ly', 'clk.ink', 'clk.sh', 'clkmein.com', 'cu2.io', 'cutt.us', 'dyo.gs',
'etsy.me', 'fb.me', 'g3t.nl',
'goo.gl', # doctored; see below
'inro.in', 'is.gd', 'j.mp', 'jfi.uno', 'mex.su', 'n9.cl', 'numl.org', 'ovo.fyi',
'ow.ly', 'pdf.ac', 'post.ly', 'qrf.in', 'rave.dj', 'rplg.co', 'rurl.us', 'sco.lt',
'snip.ly', 'surl.cn.com', 't.co', 't.ly', 'tez.kr', 'tgig.ir', 'tgw.onl', 'tiny.cc',
'tinyurl.com', 'tr.im', 'wicc.me', 'wn.nr', 'wp.me', 'x4up.org', 'xurl.es', 'zee.gl',
'zee.im'
)))
# Special case for goo.gl; update the escaped regex with some actual non-escaped regex
# to exclude anything like goo.gl/maps/...
URL_SHORTENER_REGEX_FRAGMENT = URL_SHORTENER_REGEX_FRAGMENT.replace(
r'goo\.gl', r'goo\.gl(?![?&/]maps/)')
ASN_WHITELISTED_WEBSITES = [
"unity3d.com", "ffmpeg.org", "bitcoincore.org", "latex.codecogs.com",
"advancedcustomfields.com", "name.com", "businessbloomer.com",
"wkhtmltopdf.org", "thefreedictionary.com", "ruby-doc.org",
"site.com.br", "test.ooo-pnu.ru", "swift.org", "site2.com",
"rxweb.io", "tenforums.com", "rhydolabz.com", "javatpoint.com",
# ^^ top 20 FP hosts that get reported due to 'bad ASN', collated by regex parsing
# https://metasmoke.erwaysoftware.com/data/sql/queries/164-bad-asn-in-false-positives
# As of 2019-04-18, the following had >=6 ASN detections which were FP
"ampps.com", "bintray.com", "config.ru", "datetime.date", "myexample.com",
"mywiki.wooledge.org", "sevenforums.com", "ultimatefreehost.in", "wa.me", "web.com",
# As of 2019-04-18, the following had 5 ASN detections which were FP
"androidforums.com", "getclayton.com", "indeed.com", "math.net",
"mobilefirstplatform.ibmcloud.com", "ss.ms", "table.to",
# As of 2019-04-18, the following had 4 ASN detections which were FP
"code.kx.com", "daniweb.com", "files.catbox.moe", "greatrecipetips.com", "html5up.net",
"irc.freenode.net", "italian-stresser.online", "meteocaldas.com", "techpowerup.com",
"unit-conversion.info", "wicked.io",
# not being added: bitcoinofficial.org, learn-neural-networks.com
# As of 2019-04-18, the following had 3 ASN detections which were FP
"bankingifsccodes.com", "bethelp.byethost3.com", "calculator.net", "change.by",
"clover.com", "cognimem.com", "csde.epizy.com", "docker.bintray.io", "domaine.com",
"dreamstime.com", "embedded101.com", "emildeveloping.com", "extjs.eu", "fixer.io",
"fondation-zeitgeist.com", "form.media", "formcontact.esy.es", "godandscience.org",
"kajariaceramics.com", "macappstore.org", "maven.ibiblio.org", "nayuki.io", "nxos.org",
"pdf.datasheetcatalog.com", "php.info", "pool.sks-keyservers.net", "reg.ru", "scaan.in",
"shop.btownmedia.com", "smtp.sendgrid.net", "sysengineering.ru", "techspot.com",
"testking.com", "thecollegeroar.com", "ursuscode.com", "vwo.com",
# Not added:
# 000webhostapp.com This domain would be reasonable to add if it didn't also whitelist all subdomains.
# As of 2019-04-18, the following had 2 ASN detections which were FP, and appeared to be common.
"wikileaks.org",
# Additional added not as part of a systematic investigation:
"ntp.org", "cpu-world.com", "caniuse.com", "guru99.com", "fontawesome.com",
"nirsoft.net",
# Added to prevent having 3 detections on just the domain.
"writingexplained.org", "eitren.com"]
# Hostname whitelist for the "*bad IP for hostname in {}" detections (i.e. for ip_for_url_host)
# Hostnames should be all lowercase, as the hostnames are obtained from
# urlparse().hostname, which lowercases the hostname.
WHITELISTED_IP_HOSTNAMES = [
"alfa.com.tw",
"angular.io",
"api.flutter.dev",
"bot.run",
"build.ninja",
"data.gov.sg",
"docker.com",
"ergoemacs.org",
"flutter.dev",
"form.as",
"godoc.org",
"image.network",
"log.info",
"maindomain.com",
"material.angular.io",
"model.fit",
"newsite.com",
"nextjs.org",
"ourdomain.com",
"paint.net",
"pipeline.fit",
"portforward.com",
"pub.dev",
"reactjs.org",
"shop.pimoroni.com",
"size.my",
"socket.io",
"talkerscode.com",
"terrytao.wordpress.com",
"thepihut.com",
"tips4java.wordpress.com",
"ufile.io",
"usenix.org",
"whatever.com",
"www.docker.com",
"www.sefaria.org",
"www.usenix.org",
"xahlee.info",
# Some which are in "bad IP for hostname in {}", but have only FP:
"oceansyrup.com",
"madainproject.com",
]
# Hostname whitelist for the "*bad NS for domain in {}" detections (i.e. for ns_for_url_domain)
# Hostnames should be all lowercase, as the hostnames are obtained from
# urlparse().hostname, which lowercases the hostname.
# This was seeded with those in the query:
# https://metasmoke.erwaysoftware.com/data/sql/queries/264-domains-in-bad-ns-for-domain-detections-by-fp
# which had 0 TP and > 5 FP.
# In addition, some which had a TP or two were also included, as those TP were individually determined to be
# detected by other things, TP for some reason other than what was detected, or otherwise determined to not
# need detection by this reason:
# paint.net, caniuse.com, nesbot.com, mail.com, dev47apps.com, 2.to, rudrastyh.com, joxi.ru
WHITELISTED_NS_HOSTNAMES = [
"1.run",
"123.com",
"2.to",
"4309.co.uk",
"4gtricks.com",
"5.run",
"7-zip.org",
"a2hosting.com",
"aaai.org",
"aiohttp.org",
"algoseek.com",
"ametsoc.org",
"anbox.io",
"antongerdelan.net",
"aspnetcore.app",
"automationtesting.in",
"bitsrc.io",
"bot.run",
"caniuse.com",
"ccel.org",
"cmake.org",
"cmder.net",
"coder.work",
"coinmarketcap.com",
"coinscious.io",
"convertcsv.com",
"cvedetails.com",
"datasciencemadesimple.com",
"deniz-tasarim.site",
"deploy.sh",
"desertbot.io",
"dev47apps.com",
"displaylink.com",
"duply.net",
"elecrow.com",
"engineeringtoolbox.com",
"ergoemacs.org",
"euclideanspace.com",
"everythingfonts.com",
"example2.com",
"expert-advice.org",
"flashrom.org",
"ftdichip.com",
"gitmemory.com",
"graphene-python.org",
"grymoire.com",
"hackingwithswift.com",
"harrisgeospatial.com",
"hashicorp.com",
"hopechurch.xyz",
"hostname.com",
"howtomechatronics.com",
"image.network",
"inmotionhosting.com",
"internaldomain.com",
"ionos.com",
"islamiqate.com",
"item.name",
"itsfoss.com",
"jazz-soft.net",
"johndcook.com",
"joxi.ru",
"json.org",
"json2csharp.com",
"jwork.org",
"key.properties",
"keyboard.press",
"killernetworking.com",
"kitgram.cn",
"kitware.com",
"ledsupply.com",
"liberty-development.net",
"linfo.org",
"ludwig.guru",
"mail.com",
"mastertheboss.com",
"melpa.org",
"messagebox.show",
"myhost.com",
"mypage.com",
"nesbot.com",
"newtonsoft.com",
"nextjs.org",
"nltk.org",
"orgmode.org",
"otexts.com",
"paint.net",
"pcpartpicker.com",
"pingcap.com",
"pointclouds.org",
"programming.vip",
"qgistutorials.com",
"qt.io",
"quasar.dev",
"raspberrytips.com",
"rcompanion.org",
"reactivex.io",
"readme.md",
"regexstorm.net",
"relevantcodes.com",
"repairwin.com",
"requirejs.org",
"robjhyndman.com",
"rudrastyh.com",
"sane-project.org",
"scintilla.org",
"simos.info",
"smartmontools.org",
"socket.io",
"springdoc.org",
"sqlitebrowser.org",
"sqlteam.com",
"stepik.org",
"substrate.io",
"sunfounder.cc",
"tampermonkey.net",
"techmikael.com",
"terraform.io",
"this.how",
"this.id",
"tiamet3d.com",
"tinyapps.org",
"ubuntuupdates.org",
"uipath.com",
"user.email",
"uubyte.com",
"webslesson.info",
"wikidevi.com",
"wintips.org",
"wphierarchy.com",
"wpshout.com",
"x.com",
"xahlee.info",
"xda-developers.com",
"yoursite.com",
"zlib.net",
# Some which are blacklisted, but have FP
"mastertheboss.com",
"xenarmor.com",
]
if GlobalVars.perspective_key:
PERSPECTIVE = "https://commentanalyzer.googleapis.com/v1alpha1/comments:analyze?key=" + GlobalVars.perspective_key
PERSPECTIVE_THRESHOLD = 0.85 # conservative
# Flee before the ugly URL validator regex!
# We are using this, instead of a nice library like BeautifulSoup, because spammers are
# stupid and don't always know how to actually *link* their web site. BeautifulSoup misses
# those plain text URLs.
# https://gist.github.com/dperini/729294#gistcomment-1296121
URL_REGEX = regex_compile_no_cache(
r"""((?:(?:https?|ftp)://)(?:\S+(?::\S*)?@)?(?:(?!(?:10|127)"""
r"""(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2}))"""
r"""(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])"""
r"""(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))"""
r"""|\b(?:(?:[A-Za-z\u00a1-\uffff0-9]-?)*[A-Za-z\u00a1-\uffff0-9]+)(?:\.(?:[A-Za-z\u00a1-\uffff0-9]-?)"""
r"""*[A-Za-z\u00a1-\uffff0-9]+)*(?:\.(?:[A-Za-z\u00a1-\uffff]{2,})))(?::\d{2,5})?(?:/\S*)?""", regex.U)
TAG_REGEX = regex_compile_no_cache(r"</?[abcdehiklopsu][^>]*?>|\w+://", regex.U)
UNIFORM = math.log(1 / 36)
UNIFORM_PRIOR = math.log(1 / 5)
ENGLISH = {
'a': -2.56940287968626,
'e': -2.6325365263400786,
'o': -2.9482912667071903,
'r': -2.9867566750238046,
'i': -3.043195438576378,
's': -3.053589802306065,
'n': -3.0696364572432233,
'1': -3.134872509228817,
't': -3.230441879550407,
'l': -3.2558408400221905,
'2': -3.4663376838336166,
'm': -3.4810979044444426,
'd': -3.5635447023561517,
'0': -3.5958227205042967,
'c': -3.6348280308631855,
'p': -3.6771505079154236,
'3': -3.7158848391017765,
'h': -3.7019152926538648,
'b': -3.74138548356748,
'u': -3.8457967842578014,
'k': -3.9048726800430713,
'4': -3.9411171656325226,
'5': -3.9708339604329925,
'g': -3.961715896933319,
'9': -4.019842096462643,
'6': -4.041864072829501,
'8': -4.096998079687665,
'7': -4.122126943234552,
'y': -4.1666976658279635,
'f': -4.351040269361279,
'w': -4.360690517108493,
'j': -4.741006747760368,
'v': -4.759276833451455,
'z': -5.036594538526155,
'x': -5.137009730369897,
'q': -5.624531280146579
}
ENGLISH_PRIOR = math.log(4 / 5)
class PostFilter:
"""
General filter for SE posts
"""
def __init__(self, all_sites=True, sites=None, max_rep=1, max_score=0, question=True, answer=True):
self.all_sites = all_sites
self.sites = set(sites) if sites is not None else set()
self.max_rep = max_rep
self.max_score = max_score
self.question = question
self.answer = answer
def match(self, post):
"""
See if a post matches this filter
"""
if (post.is_answer and not self.answer) or (not post.is_answer and not self.question):
# Wrong post type
return False
elif self.all_sites == (post.post_site in self.sites):
# Post is on wrong site
return False
elif (post.owner_rep > self.max_rep) or (post.post_score > self.max_score):
# High score or high rep
return False
else:
return True
class Rule:
"""
A single spam-checking rule
"""
default_filter = PostFilter()
def __init__(self, item, reason, title=True, body=True, body_summary=True, username=True, filter=None,
stripcodeblocks=False, whole_post=False, skip_creation_sanity_check=False, rule_id=None,
elapsed_time_reporting=None):
self.regex = None
self.func = None
if isinstance(item, (str, URL_REGEX.__class__)):
self.regex = item
else:
self.func = item
self.reason = reason
self.title = title
self.body = body
self.body_summary = body_summary
self.username = username
self.filter = filter or Rule.default_filter
self.stripcodeblocks = stripcodeblocks
self.whole_post = whole_post
self.rule_id = rule_id
self.elapsed_time_reporting = elapsed_time_reporting
if not skip_creation_sanity_check:
self.sanity_check()
def sanity_check(self):
if not self.func and not self.regex:
raise TypeError("A rule must have either 'func' or 'regex' valid! : {}".format(self.reason))
def match(self, post):
"""
Run this rule against a post.
Returns a list of 3 tuples for [result_title, result_username, result_body],
each in (match, reason, why) format
"""
if not self.filter.match(post):
# Post not matching the filter
return [(False, "", "")] * 3
body_to_check = post.body.replace("&nsbp;", "").replace("\xAD", "") \
.replace("\u200B", "").replace("\u200C", "")
body_type = "body" if not post.is_answer else "answer"
reason = self.reason
reason_title = reason.replace("{}", "title")
reason_username = reason.replace("{}", "username")
reason_body = reason.replace("{}", body_type)
if self.stripcodeblocks:
# use a placeholder to avoid triggering "linked punctuation" on code-only links
body_to_check = strip_pre_and_code_elements(body_to_check, leave_note=True)
if reason == 'phone number detected in {}':
body_to_check = regex.sub("<(?:a|img)[^>]+>", "", body_to_check)
matched_title, matched_username, matched_body = False, False, False
result_title, result_username, result_body = None, None, None
if self.func: # Functional check takes precedence over regex check
if self.whole_post:
matched_title, matched_username, matched_body, why_text = self.func(post)
result_title = (matched_title, reason_title,
reason_title.capitalize() + " - " + why_text)
result_username = (matched_username, reason_username,
reason_username.capitalize() + " - " + why_text)
result_body = (matched_body, reason_body,
reason_body.capitalize() + " - " + why_text)
else:
if self.title and not post.is_answer:
matched_title, why_text = self.func(post.title, post.post_site)
result_title = (matched_title, reason_title,
reason_title.capitalize() + " - " + why_text)
else:
result_title = (False, "", "")
if self.username:
matched_username, why_text = self.func(post.user_name, post.post_site)
result_username = (matched_username, reason_username,
reason_username.capitalize() + " - " + why_text)
else:
result_username = (False, "", "")
if self.body and not post.body_is_summary:
matched_body, why_text = self.func(body_to_check, post.post_site)
result_body = (matched_body, reason_body,
reason_body.capitalize() + " - " + why_text)
elif self.body_summary and post.body_is_summary:
matched_body, _ = self.func(body_to_check, post.post_site)
result_body = (matched_body, "", "")
else:
result_body = (False, "", "")
elif self.regex:
try:
compiled_regex = self.compiled_regex
except AttributeError:
compiled_regex = regex_compile_no_cache(self.regex, regex.UNICODE, city=city_list, ignore_unused=True)
self.compiled_regex = compiled_regex
if self.title and not post.is_answer:
matches = list(compiled_regex.finditer(post.title))
result_title = (bool(matches), reason_title,
reason_title.capitalize() + " - " + FindSpam.match_infos(matches))
else:
result_title = (False, "", "")
if self.username:
matches = list(compiled_regex.finditer(post.user_name))
result_username = (bool(matches), reason_username,
reason_username.capitalize() + " - " + FindSpam.match_infos(matches))
else:
result_username = (False, "", "")
if (self.body and not post.body_is_summary) \
or (self.body_summary and post.body_is_summary):
matches = list(compiled_regex.finditer(body_to_check))
result_body = (bool(matches), reason_body,
reason_body.capitalize() + " - " + FindSpam.match_infos(matches))
else:
result_body = (False, "", "")
else:
raise TypeError("To match, a rule must have either 'func' or 'regex' valid! : {}".format(reason))
# "result" format: tuple((title_spam, title_reason, why), (username_spam, username_reason, why),
# (body_spam, body_reason, why))
return result_title, result_username, result_body
def __call__(self, *args, **kwargs):
# Preserve the functionality of a function
if self.func:
return self.func(*args, **kwargs)
raise TypeError("This rule has no function set, can't call")
class FindSpam:
rules = []
rule_ids = set()
reasons = set()
# supplied at the bottom of this file
rule_bad_keywords = None
rule_watched_keywords = None
rule_blacklisted_websites = None
rule_blacklisted_usernames = None
# This is the minimum number of seconds which need to have elapsed for the Rule
# in order for some extra text to be added to the log output in order to draw more
# attention to the line.
ELAPSED_TIME_DRAW_ATTENTION_MIN = 5
# This is an arbitrarily long list of tuples representing different required elapsed times,
# the log level to use and text to prepend to the chat message.
# If the text for the log level doesn't exist, then a log(<log level>, report text)
# call is not executed.
# If there's no text to prepend to the chat message, then no chat message is sent for that entry.
# The list is scanned through in order with the last value where the elapsed time for the Rule
# is greater than the <minimum elapsed time> is acted upon.
ELAPSED_TIME_LOG_AND_TELL_LEVELS = [
# (<Log level>, <text prepended to chat message>, <minimum elapsed time>)
('debug', '', 1), # > 1 s: Log a "debug" level message for the Rule; No chat message
('info', 'High ', 10), # > 10 s: Log an "info" for the Rule and output to chat as "High "
('warning', '**Very High** ', 30), # > 30 s: Log a "warning" and output to chat as bold "Very High"
]
@classmethod
def reload_blacklists(cls):
global bad_keywords_nwb
blacklists.load_blacklists()
# See PR 2322 for the reason of (?:^|\b) and (?:\b|$)
# (?w:\b) is also useful
cls.rule_bad_keywords.regex = r"(?is)(?:^|\b|(?w:\b))(?:{})(?:\b|(?w:\b)|$)|{}".format(
"|".join(GlobalVars.bad_keywords), "|".join(bad_keywords_nwb))
try:
del cls.rule_bad_keywords.compiled_regex
except AttributeError:
pass
cls.rule_bad_keywords.sanity_check()
cls.rule_watched_keywords.regex = r'(?is)(?:^|\b|(?w:\b))(?:{})(?:\b|(?w:\b)|$)'.format(
"|".join(GlobalVars.watched_keywords.keys()))
try:
del cls.rule_watched_keywords.compiled_regex
except AttributeError:
pass
cls.rule_watched_keywords.sanity_check()
cls.rule_blacklisted_websites.regex = r"(?i)({})".format(
"|".join(GlobalVars.blacklisted_websites))
try:
del cls.rule_blacklisted_websites.compiled_regex
except AttributeError:
pass
cls.rule_blacklisted_websites.sanity_check()
cls.rule_blacklisted_usernames.regex = r"(?i)({})".format(
"|".join(GlobalVars.blacklisted_usernames))
try:
del cls.rule_blacklisted_usernames.compiled_regex
except AttributeError:
pass
cls.rule_blacklisted_usernames.sanity_check()
GlobalVars.blacklisted_numbers_full, GlobalVars.blacklisted_numbers, \
GlobalVars.blacklisted_numbers_normalized = \
phone_numbers.process_numlist(GlobalVars.blacklisted_numbers_raw)
GlobalVars.watched_numbers_full, GlobalVars.watched_numbers, \
GlobalVars.watched_numbers_normalized = phone_numbers.process_numlist(GlobalVars.watched_numbers_raw)
log('debug', "Global blacklists loaded")
@staticmethod
def test_post(post):
result = []
why_title, why_username, why_body = [], [], []
post_brief_id = "{}/{}/{}".format(post.post_site, "a" if post.is_answer else "q", post.post_id)
for rule in FindSpam.rules:
start_time = time.time()
title, username, body = rule.match(post)
end_time = time.time()
elapsed_time = end_time - start_time
elapsed_time_draw_attention_min = FindSpam.ELAPSED_TIME_DRAW_ATTENTION_MIN
elapsed_time_levels = FindSpam.ELAPSED_TIME_LOG_AND_TELL_LEVELS
if type(rule.elapsed_time_reporting) is dict:
elapsed_time_draw_attention_min = rule.elapsed_time_reporting.get('draw_attention_min', 600)
elapsed_time_levels = rule.elapsed_time_reporting.get('levels', [])
draw_attention = ' <------------------' if elapsed_time > elapsed_time_draw_attention_min else ''
log_type = ''
tell_text = ''
for log_level, tell_level, minimum_elapsed_time in elapsed_time_levels:
if (elapsed_time >= minimum_elapsed_time):
log_type = log_level
tell_text = tell_level
if log_type or tell_text:
log_message = ('Rule elapsed time: {:.2f} s'.format(elapsed_time)
+ ': {}: {}'.format(rule.reason, rule.rule_id)
+ ' for [{}](https://{})'.format(post_brief_id, post_brief_id))
if log_type:
log(log_type, log_message + draw_attention)
if tell_text:
chatcommunicate.tell_rooms_with('long-rule-times', tell_text + log_message)
if title[0]:
result.append(title[1])
why_title.append(title[2])
if username[0]:
result.append(username[1])
why_username.append(username[2])
if body[0]:
result.append(body[1])
why_body.append(body[2])
result = list(set(result))
result.sort()
why = "\n".join(sorted(why_title + why_username + why_body)).strip()
return result, why
@staticmethod
def match_info(match):
start, end = match.span()
group = match.group().replace("\n", "")
return "Position {}-{}: {}".format(start + 1, end, group)
@staticmethod
def match_infos(matches):
spans = {}
for match in matches:
group = match.group().strip().replace("\n", "")
if group not in spans:
spans[group] = [match.span()]
else:
spans[group].append(match.span())
infos = [(sorted(spans[word]), word) for word in spans]
infos.sort(key=lambda info: info[0]) # Sort by positions of appearances
return ", ".join([
"Position{} {}: {}".format(
"s" if len(span) > 1 else "",
", ".join(
["{}-{}".format(a, b) for a, b in span]
if len(span) < 14 else
["{}-{}".format(a, b) for a, b in span[:12]] + ["+{} more".format(len(span) - 12)]
),
word
)
for span, word in infos])
################################################################################
# The Creator of all the spam check rules
# Do NOT touch the default values unless you want to break things
# what if a function does more than one job?
def create_rule(reason, regex=None, func=None, *, all=True, sites=[],
title=True, body=True, body_summary=False, username=False,
max_score=0, max_rep=1, question=True, answer=True, stripcodeblocks=False,
whole_post=False, # For some functions
disabled=False, # yeah, disabled=True is intuitive
rule_id=None, # Unique rule ID [The "reason" may be on multiple rules; this is unique to the rule.]
elapsed_time_reporting=None,
skip_creation_sanity_check=False):
if not isinstance(reason, str):
raise ValueError("reason must be a string")
if GlobalVars.valid_detection_reasons is not None and reason not in GlobalVars.valid_detection_reasons:
# There was a list of reasons provided in the config file as valid and this detection reason isn't in that list.
disabled = True
if rule_id is None and reason not in FindSpam.reasons:
# Only the first Rule with the reason can use the reason as the default rule_id.
rule_id = reason
if rule_id is None or rule_id in FindSpam.rule_ids:
raise ValueError("rule_id must exist and be unique for reason: {}:: ID: {}".format(reason, rule_id))
FindSpam.rule_ids.add(rule_id)
FindSpam.reasons.add(reason)
if GlobalVars.valid_rule_ids is not None and rule_id not in GlobalVars.valid_rule_ids:
# There was a list of valid rule IDs provided in the config file and this detection isn't in that list.
disabled = True
if not (body or body_summary or username): # title-only
answer = False # answers have no titles, this saves some loops
post_filter = PostFilter(all_sites=all, sites=sites, max_score=max_score, max_rep=max_rep,
question=question, answer=answer)
if regex is not None:
# Standalone mode
rule = Rule(regex, reason=reason, filter=post_filter,
title=title, body=body, body_summary=body_summary, username=username,
stripcodeblocks=stripcodeblocks, skip_creation_sanity_check=skip_creation_sanity_check,
rule_id=rule_id, elapsed_time_reporting=elapsed_time_reporting)
if not disabled:
FindSpam.rules.append(rule)
return rule
else:
# Decorator-generator mode
def decorator(func):
if isinstance(func, Rule):
func = func.func # Extract the real function from the created rule to allow multi-creation
try:
func.__call__
except AttributeError:
raise ValueError("This rule does not contain a function, can't recreate") from None
rule = Rule(func, reason=reason, filter=post_filter, whole_post=whole_post,
title=title, body=body, body_summary=body_summary, username=username,
stripcodeblocks=stripcodeblocks, skip_creation_sanity_check=skip_creation_sanity_check,
rule_id=rule_id, elapsed_time_reporting=elapsed_time_reporting)
if not disabled:
FindSpam.rules.append(rule)
return rule
if func is not None: # Function is supplied, no need to decorate
return decorator(func)
else: # real decorator mode
return decorator
def is_whitelisted_website(url):
# Imported from method link_at_end
return bool(WHITELISTED_WEBSITES_REGEX.search(url)) or metasmoke_cache.is_website_whitelisted(url)
def levenshtein(s1, s2):
if len(s1) < len(s2):
return levenshtein(s2, s1)
if len(s2) == 0:
return len(s1)
previous_row = range(len(s2) + 1)
for i, c1 in enumerate(s1):
current_row = [i + 1]
for j, c2 in enumerate(s2):
insertions = previous_row[j + 1] + 1
deletions = current_row[j] + 1
substitutions = previous_row[j] + (c1 != c2)
current_row.append(min(insertions, deletions, substitutions))
previous_row = current_row
return previous_row[-1]
@create_rule("misleading link", title=False, max_rep=11, max_score=1, stripcodeblocks=True)
def misleading_link(s, site):
# Regex that finds the href value and the link text from an HTML <a>, if the link text
# doesn't contain a '<' or space.
link_regex = r"<a href=\"([^\"]++)\"[^>]*+>\s*+([^< ]++)\s*+<\/a>"
compiled = regex.compile(link_regex)
search = compiled.search(s)
if search is None:
# The s string contained no HTML <a> elements with an href and link text matching the link_regex.
return False, ''
href, text = search[1], search[2]
if '.' not in text:
# To have a first level domain, the link text must contain a '.'.
return False, ''
try:
parsed_href = tld.get_tld(href, as_object=True)
if parsed_href.fld in SE_SITES_DOMAINS:
return False, ''
parsed_text = tld.get_tld(text, fix_protocol=True, as_object=True)
# The parsed_text_fld_with_extra_subdomain check verifies the tld package found an actual domain,
# rather than a second part of a tld. The tld package has gotten better at being sure it gets
# a full tld, when it exists, but there may be some corner cases. This is definitely needed
# at least for some tld versions prior to 0.9.8 (e.g. 0.9.0), but possible corner cases hint
# that this check should be retained.
parsed_text_fld_with_extra_subdomain = tld.get_tld('foo.' + parsed_text.fld, fix_protocol=True, as_object=True)
if parsed_text.fld == parsed_text.tld or parsed_text.tld != parsed_text_fld_with_extra_subdomain.tld:
# The link text doesn't have a valid domain (i.e. the FLD must be more than just the TLD).
return False, ''
except (tld.exceptions.TldDomainNotFound, tld.exceptions.TldBadUrl, ValueError) as err:
return False, ''
if site == 'stackoverflow.com' and parsed_text.fld.split('.')[-1] in SAFE_EXTENSIONS:
return False, ''
if href.endswith('/' + text):
# Don't detect URLs like "https://example.com/foo.txt" for link text "foo.txt".
return False, ''
if levenshtein(parsed_href.domain, parsed_text.domain) <= LEVEN_DOMAIN_DISTANCE: # Preempt
return False, ''
try:
href_domain = unquote_plus(parsed_href.domain.encode("ascii").decode("idna"))
except ValueError:
href_domain = parsed_href.domain
try:
text_domain = unquote_plus(parsed_text.domain.encode("ascii").decode("idna")) # people do post this, sad
except ValueError:
text_domain = parsed_text.domain
if levenshtein(href_domain, text_domain) > LEVEN_DOMAIN_DISTANCE:
return True, 'Domain {} indicated by possible misleading text {}.'.format(
parsed_href.fld, parsed_text.fld
)
else:
return False, ''
# noinspection PyUnusedLocal,PyMissingTypeHints,PyTypeChecker
@create_rule("repeating words in {}", max_rep=11, stripcodeblocks=True)
def has_repeating_words(s, site):
# RegEx DoS warning!!!
matcher = regex.compile(r"\b(?P<words>(?P<word>[a-z]+))(?:[][\s.,;!/\()+_-]+(?P<words>(?P=word))){4,}\b",
flags=regex.I | regex.S | regex.V0)
for match in matcher.finditer(s):
words = match.captures("words")
word = match.group("word")
if len(words) >= 5 and len(word) * len(words) >= 0.18 * len(s):
return True, "{}*{}".format(repr(word), len(words))
return False, ""
# noinspection PyUnusedLocal,PyMissingTypeHints
@create_rule("few unique characters in {}", title=False, max_rep=10000, max_score=10000)
def has_few_characters(s, site):
s = regex.sub("</?(?:p|strong|em)>", "", s).rstrip() # remove HTML paragraph tags from posts
uniques = len(set(s) - {"\n", "\t"})
length = len(s)
thresholds = [ # LBound, UBound, MaxUnique
(30, 36, 6), (36, 42, 7), (42, 48, 8), (48, 54, 9), (54, 60, 10),
(60, 70, 11), (70, 80, 12), (80, 90, 13), (90, 100, 14), (100, 2**30, 15),
]
if any([t[0] <= length < t[1] and uniques <= t[2] for t in thresholds]):
if uniques >= 5 and site == "math.stackexchange.com":
# Special case for Math.SE: Uniques case may trigger false-positives.
return False, ""
return True, "Contains {} unique character{}".format(uniques, "s" if uniques >= 2 else "")
return False, ""
def len_img_block(string):
""" Length of image html blocks from a string. """
all_oc = regex.findall(r'<img\s[^<>]*+>', string)
tot_len = 0
for oc in all_oc:
tot_len += len(oc)
return tot_len
# max_score=2 to prevent voting fraud
@create_rule("post is mostly images", title=False, max_rep=201, max_score=2)
def mostly_img(s, site):
if len(s) == 0:
return False, ""
s_len_img = len_img_block(strip_code_elements(s))
if s_len_img / len(s) > IMG_TXT_R_THRES:
return True, "{:.4f} of the post is html image blocks".format(s_len_img / len(s))
return False, ""
# noinspection PyUnusedLocal,PyMissingTypeHints
@create_rule("repeating characters in {}", stripcodeblocks=True, max_rep=10000, max_score=10000)
def has_repeating_characters(s, site):
s = s.strip().replace("\u200B", "").replace("\u200C", "") # Strip leading and trailing spaces
if "\n\n" in s or "<code>" in s or "<pre>" in s:
return False, ""
s = URL_REGEX.sub("", s) # Strip URLs for this check
if not s:
return False, ""
# Don't detect a couple of common ways for people to try to include tables (reduces FP by ~20%).
if regex.search(r"(?:(?:----+|====+)[+|]+){2}", s):
return False, ""
# matches = regex.compile(r"([^\s_.,?!=~*/0-9-])(\1{9,})", regex.UNICODE).findall(s)
matches = regex.compile(r"([^\s\d_.])(\1{9,})", regex.UNICODE).findall(s)
match = "".join(["".join(match) for match in matches])
if len(match) / len(s) >= REPEATED_CHARACTER_RATIO: # Repeating characters make up >= 20 percent
return True, "{}".format(", ".join(
["{}*{}".format(repr(match[0]), len(''.join(match))) for match in matches]))
return False, ""
# noinspection PyUnusedLocal,PyMissingTypeHints
@create_rule("link at end of {}", title=False, all=False,
sites=["superuser.com", "askubuntu.com", "drupal.stackexchange.com", "meta.stackexchange.com",
"security.stackexchange.com", "patents.stackexchange.com", "money.stackexchange.com",
"gaming.stackexchange.com", "arduino.stackexchange.com", "workplace.stackexchange.com"],
rule_id="link at end: main link_at_end, limited sites")
def link_at_end(s, site): # link at end of question, on selected sites
s = regex.sub("</?(?:strong|em|p)>", "", s)
match = regex.compile(
r"(?i)https?://(?:"
"" r"[.A-Za-z0-9-]*/?[.A-Za-z0-9-]*/?|"
"" r"plus\.google\.com/[\w/]*|"
"" r"www\.pinterest\.com/pin/[\d/]*|"
r")(?=</a>\s*$)").search(s)
if match and not is_whitelisted_website(match.group(0)):
return True, u"Link at end: {}".format(match.group(0))
return False, ""
# noinspection PyUnusedLocal,PyMissingTypeHints,PyTypeChecker
@create_rule("non-English link in {}", title=False, question=False, stripcodeblocks=True, sites=[
"pt.stackoverflow.com", "es.stackoverflow.com", "ja.stackoverflow.com", "ru.stackoverflow.com",
"rus.stackexchange.com", "islam.stackexchange.com", "japanese.stackexchange.com", "hinduism.stackexchange.com",
"judaism.stackexchange.com", "buddhism.stackexchange.com", "chinese.stackexchange.com",
"russian.stackexchange.com", "french.stackexchange.com", "portuguese.stackexchange.com",
"spanish.stackexchange.com", "codegolf.stackexchange.com", "korean.stackexchange.com",
"esperanto.stackexchange.com", "ukrainian.stackexchange.com"])
def non_english_link(s, site): # non-english link in short answer
if len(s) < 600:
links = regex.compile(r'nofollow(?: noreferrer)?">([^<]*)(?=</a>)', regex.UNICODE).findall(s)
for link_text in links:
word_chars = regex.sub(r"(?u)\W", "", link_text)
non_latin_chars = regex.sub(r"\w", "", word_chars)
if len(word_chars) >= 1 and ((len(word_chars) <= 20 and len(non_latin_chars) >= 1) or
(len(non_latin_chars) >= 0.05 * len(word_chars))):
return True, u"Non-English link text: *{}*".format(link_text)
return False, ""
# noinspection PyUnusedLocal,PyMissingTypeHints,PyTypeChecker
@create_rule("mostly non-Latin {}", stripcodeblocks=True, sites=[
"stackoverflow.com", "ja.stackoverflow.com", "pt.stackoverflow.com", "es.stackoverflow.com",
"islam.stackexchange.com", "japanese.stackexchange.com", "anime.stackexchange.com",
"hinduism.stackexchange.com", "judaism.stackexchange.com", "buddhism.stackexchange.com",
"chinese.stackexchange.com", "french.stackexchange.com", "spanish.stackexchange.com",
"portuguese.stackexchange.com", "codegolf.stackexchange.com", "korean.stackexchange.com",
"ukrainian.stackexchange.com"], body_summary=True, rule_id="Mostly non-Latin: most sites")
@create_rule("mostly non-Latin {}", all=False, sites=["stackoverflow.com"],
stripcodeblocks=True, body_summary=True, question=False, rule_id="Mostly non-Latin: SO answers only")
def mostly_non_latin(s, site): # majority of post is in non-Latin, non-Cyrillic characters
word_chars = regex.sub(r'(?u)[\W0-9]|http\S*', "", s)
non_latin_chars = regex.sub(r"(?u)\p{script=Latin}|\p{script=Cyrillic}", "", word_chars)
if len(non_latin_chars) > 0.4 * len(word_chars):
return True, "Text contains {} non-Latin characters out of {}".format(len(non_latin_chars), len(word_chars))
return False, ""
phone_number_detected_in_title_second_exclude_regex_text = (
r"(?is)^(?:"
"" r"(?="
"" "" r"(?!.*?(?:quick[\W_]*+books?|binance|support|help(?:line|desk)|\bcall\b|antivirus|customer|whatsapp?))"
"" "" r".*?(?:"
"" "" "" r"errors?\b"
"" "" "" r"|(?#list of words/phrases which tend to indicate FP, but are also used by some spammers)\b(?:"
"" "" "" "" r"regex|invalid|attempt|config"
"" "" "" "" r"|translate|spreadsheet|identify(?:ing)?|stack(?:overflow|exchange)\.com/questions/"
"" "" "" "" r"|ref=|official build|(?-i:GUI)|chrome ?(?: version)?\d{2,3}\.\d\.\d{4}\.\d{3}"
"" "" "" "" r"|paten[dt]|arxiv|(?:please|pls)(?: someone)?(?: help)"
"" "" "" "" r"|(?:any|some) ?(?:one|body)(?: (?:please|pls))? help|i need help|UUID"
"" "" "" r")\b"
"" r"))"
"" r"|.*?(?:"
"" "" r"(?#IP address)\b(?<=[\s\[\](,;:@/\\-]|^)(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}" # ) syntax
"" "" r"(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b(?=[\s\[\](,;:/\\-]|$)(?<!\b\d\.\d\.\d\.\d\b)" # ) highlighting
"" "" r"|(?#simple recent date)(?<!\d)(?:"
"" "" "" r"(?:(?:[012]?\d|3[01])[/-]){2}20(?:1\d|2[0-6])"
"" "" "" r"|20(?:1\d|2[0-6])(?:[/-](?:[012]?\d|3[01])){2}"
"" "" r")(?!\d)"