import functools
import random
import re
import signal
from functools import partial
from os import path
from typing import Any
from urllib.parse import parse_qs, urlparse
import bleach
from bleach.css_sanitizer import CSSSanitizer
from bleach.linkifier import LinkifyFilter
from bs4 import BeautifulSoup
from mistletoe import markdown
from files.classes.domains import BannedDomain
from files.helpers.config.const import *
from files.helpers.const_stateful import *
from files.helpers.regex import *
from .get import *
TLDS = ( # Original gTLDs and ccTLDs
'ac','ad','ae','aero','af','ag','ai','al','am','an','ao','aq','ar','arpa','as','asia','at',
'au','aw','ax','az','ba','bb','bd','be','bf','bg','bh','bi','biz','bj','bm','bn','bo','br',
'bs','bt','bv','bw','by','bz','ca','cafe','cat','cc','cd','cf','cg','ch','ci','ck','cl',
'cm','cn','co','com','coop','cr','cu','cv','cx','cy','cz','de','dj','dk','dm','do','dz','ec',
'edu','ee','eg','er','es','et','eu','fi','fj','fk','fm','fo','fr','ga','gb','gd','ge','gf',
'gg','gh','gi','gl','gm','gn','gov','gp','gq','gr','gs','gt','gu','gw','gy','hk','hm','hn',
'hr','ht','hu','id','ie','il','im','in','info','int','io','iq','ir','is','it','je','jm','jo',
'jobs','jp','ke','kg','kh','ki','km','kn','kp','kr','kw','ky','kz','la','lb','lc','li','lk',
'lr','ls','lt','lu','lv','ly','ma','mc','md','me','mg','mh','mil','mk','ml','mm','mn','mo',
'mobi','mp','mq','mr','ms','mt','mu','museum','mv','mw','mx','my','mz','na','name',
'nc','ne','net','nf','ng','ni','nl','no','np','nr','nu','nz','om','org','pa','pe','pf','pg',
'ph','pk','pl','pm','pn','post','pr','pro','ps','pt','pw','py','qa','re','ro','rs','ru','rw',
'sa','sb','sc','sd','se','sg','sh','si','sj','sk','sl','sm','sn','so','social','sr','ss','st',
'su','sv','sx','sy','sz','tc','td','tel','tf','tg','th','tj','tk','tl','tm','tn','to','tp',
'tr','travel','tt','tv','tw','tz','ua','ug','uk','us','uy','uz','va','vc','ve','vg','vi','vn',
'vu','wf','ws','xn','xxx','ye','yt','yu','za','zm','zw',
# New gTLDs
'app','cleaning','club','dev','farm','florist','fun','gay','lgbt','life','lol',
'moe','mom','monster','new','news','online','pics','press','pub','site',
'vip','win','world','wtf','xyz','video','host','art','media'
)
allowed_tags = ('b','blockquote','br','code','del','em','h1','h2','h3','h4','h5','h6','hr','i',
'li','ol','p','pre','strong','sub','sup','table','tbody','th','thead','td','tr','ul',
'marquee','a','span','ruby','rp','rt','spoiler','img','lite-youtube','video','audio','g')
allowed_styles = ['color', 'background-color', 'font-weight', 'text-align', 'filter',]
def allowed_attributes(tag, name, value):
if name == 'style': return True
if tag == 'marquee':
if name in {'direction', 'behavior', 'scrollamount'}: return True
if name in {'height', 'width'}:
try: value = int(value.replace('px', ''))
except: return False
if 0 < value <= 250: return True
if tag == 'a':
if name == 'href' and '\\' not in value and 'xn--' not in value:
return True
if name == 'rel' and value == 'nofollow noopener': return True
if name == 'target' and value == '_blank': return True
if tag == 'img':
if name in {'src','data-src'}: return is_safe_url(value)
if name == 'loading' and value == 'lazy': return True
if name == 'data-bs-toggle' and value == 'tooltip': return True
if name in {'g','b','glow'} and not value: return True
if name in {'alt','title'}: return True
if tag == 'lite-youtube':
if name == 'params' and value.startswith('autoplay=1&modestbranding=1'): return True
if name == 'videoid': return True
if tag == 'video':
if name == 'controls' and value == '': return True
if name == 'preload' and value == 'none': return True
if name == 'src': return is_safe_url(value)
if tag == 'audio':
if name == 'src': return is_safe_url(value)
if name == 'controls' and value == '': return True
if name == 'preload' and value == 'none': return True
if tag == 'p':
if name == 'class' and value in {'mb-0','resizable'}: return True
if tag == 'span':
if name == 'data-bs-toggle' and value == 'tooltip': return True
if name == 'title': return True
if name == 'alt': return True
if tag == 'table':
if name == 'class' and value == 'table': return True
return False
def build_url_re(tlds, protocols):
"""Builds the url regex used by linkifier
If you want a different set of tlds or allowed protocols, pass those in
and stomp on the existing ``url_re``::
from bleach import linkifier
my_url_re = linkifier.build_url_re(my_tlds_list, my_protocols)
linker = LinkifyFilter(url_re=my_url_re)
"""
return re.compile(
r"""\(*# Match any opening parentheses.
\b(?"]*)?
# /path/zz (excluding "unsafe" chars from RFC 1738,
# except for ~, which happens in practice)
(?:\#[^#\s\|\\\^\[\]`<>"]*)?
# #hash (excluding "unsafe" chars from RFC 1738,
# except for ~, which happens in practice)
""".format(
"|".join(sorted(protocols)), "|".join(sorted(tlds))
),
re.IGNORECASE | re.VERBOSE | re.UNICODE,
)
url_re = build_url_re(tlds=TLDS, protocols=['http', 'https'])
def callback(attrs, new=False):
if (None, "href") not in attrs:
return # Incorrect tag
href = attrs[(None, "href")]
# \ in href right after / makes most browsers ditch site hostname and allows for a host injection bypassing the check, see cool
if "\\" in href or not ascii_only_regex.fullmatch(href):
attrs["_text"] = href # Laugh at this user
del attrs[(None, "href")] # Make unclickable and reset harmful payload
return attrs
if not href.startswith('/') and not href.startswith(f'{SITE_FULL}/'):
attrs[(None, "target")] = "_blank"
attrs[(None, "rel")] = "nofollow noopener"
return attrs
def render_emoji(html, regexp, golden, marseys_used, b=False):
emojis = list(regexp.finditer(html))
captured = set()
for i in emojis:
if i.group(0) in captured: continue
captured.add(i.group(0))
emoji = i.group(1).lower()
attrs = ''
if b: attrs += ' b'
if golden and len(emojis) <= 20 and ('marsey' in emoji or emoji in marseys_const2):
if random.random() < 0.0025: attrs += ' g'
elif random.random() < 0.00125: attrs += ' glow'
old = emoji
emoji = emoji.replace('!','').replace('#','')
if emoji == 'marseyrandom': emoji = random.choice(marseys_const2)
emoji_partial_pat = ''
emoji_partial = '
'
emoji_html = None
if emoji.endswith('pat') and emoji != 'marseyunpettablepat':
if path.isfile(f"files/assets/images/emojis/{emoji.replace('pat','')}.webp"):
emoji_html = f'
{emoji_partial_pat.format(old, f"/e/{emoji[:-3]}.webp", attrs)}'
elif emoji.startswith('@'):
if u := get_user(emoji[1:-3], graceful=True):
emoji_html = f'
{emoji_partial_pat.format(old, f"/pp/{u.id}", attrs)}'
elif path.isfile(f'files/assets/images/emojis/{emoji}.webp'):
emoji_html = emoji_partial.format(old, f'/e/{emoji}.webp', attrs)
if emoji_html:
marseys_used.add(emoji)
html = re.sub(f'(?)', emoji_html, html)
return html
def with_sigalrm_timeout(timeout: int):
'Use SIGALRM to raise an exception if the function executes for longer than timeout seconds'
# while trying to test this using time.sleep I discovered that gunicorn does in fact do some
# async so if we timeout on that (or on a db op) then the process is crashed without returning
# a proper 500 error. Oh well.
def sig_handler(signum, frame):
print("Timeout!", flush=True)
raise Exception("Timeout")
def inner(func):
@functools.wraps(func)
def wrapped(*args, **kwargs):
signal.signal(signal.SIGALRM, sig_handler)
signal.alarm(timeout)
try:
return func(*args, **kwargs)
finally:
signal.alarm(0)
return wrapped
return inner
def sanitize_raw_title(sanitized:Optional[str]) -> str:
if not sanitized: return ""
sanitized = sanitized.replace('\u200e','').replace('\u200b','').replace("\ufeff", "").replace("\r","").replace("\n", "")
sanitized = sanitized.strip()
return sanitized[:POST_TITLE_LENGTH_LIMIT]
def sanitize_raw_body(sanitized:Optional[str], is_post:bool) -> str:
if not sanitized: return ""
sanitized = html_comment_regex.sub('', sanitized)
sanitized = sanitized.replace('\u200e','').replace('\u200b','').replace("\ufeff", "").replace("\r\n", "\n")
sanitized = sanitized.strip()
return sanitized[:POST_BODY_LENGTH_LIMIT if is_post else COMMENT_BODY_LENGTH_LIMIT]
def sanitize_settings_text(sanitized:Optional[str], max_length:Optional[int]=None) -> str:
if not sanitized: return ""
sanitized = sanitized.replace('\u200e','').replace('\u200b','').replace("\ufeff", "").replace("\r", "").replace("\n","")
sanitized = sanitized.strip()
if max_length: sanitized = sanitized[:max_length]
return sanitized
@with_sigalrm_timeout(10)
def sanitize(sanitized, golden=True, limit_pings=0, showmore=True, count_marseys=False, torture=False, sidebar=False):
sanitized = sanitized.strip()
sanitized = utm_regex.sub('', sanitized)
sanitized = utm_regex2.sub('', sanitized)
if torture:
sanitized = torture_ap(sanitized, g.v.username)
to_add = random.choice((':#trumpjaktalking:', ':#reposthorse:', '![](/i/supportjews.webp)', '![](/i/gluck.webp)'))
sanitized += f'\n{to_add}'
sanitized = normalize_url(sanitized)
if '```' not in sanitized and '
' not in sanitized: sanitized = linefeeds_regex.sub(r'\1\n\n\2', sanitized) sanitized = greentext_regex.sub(r'\1\>\2 ', sanitized) sanitized = image_regex.sub(r'\1![](\2)\5', sanitized) sanitized = image_check_regex.sub(r'\1', sanitized) sanitized = link_fix_regex.sub(r'\1https://\2', sanitized) if FEATURES['MARKUP_COMMANDS']: sanitized = command_regex.sub(command_regex_matcher, sanitized) sanitized = markdown(sanitized) sanitized = strikethrough_regex.sub(r'\1\2', sanitized) # replacing zero width characters, overlines, fake colons sanitized = sanitized.replace('\u200e','').replace('\u200b','').replace("\ufeff", "").replace("\u033f","").replace("\u0589", ":") sanitized = reddit_regex.sub(r'\1/\2', sanitized) sanitized = sub_regex.sub(r'\1/\2', sanitized) v = getattr(g, 'v', None) names = set(m.group(2) for m in mention_regex.finditer(sanitized)) if limit_pings and len(names) > limit_pings and not v.admin_level >= PERMS['POST_COMMENT_INFINITE_PINGS']: abort(406) users_list = get_users(names, graceful=True) users_dict = {} for u in users_list: users_dict[u.username.lower()] = u if u.original_username: users_dict[u.original_username.lower()] = u def replacer(m): u = users_dict.get(m.group(2).lower()) if not u: return m.group(0) return f'{m.group(1)}@{u.username}' sanitized = mention_regex.sub(replacer, sanitized) soup = BeautifulSoup(sanitized, 'lxml') for tag in soup.find_all("img"): if tag.get("src") and not tag["src"].startswith('/pp/'): if not is_safe_url(tag["src"]): a = soup.new_tag("a", href=tag["src"], rel="nofollow noopener", target="_blank") a.string = tag["src"] tag.replace_with(a) continue tag["loading"] = "lazy" tag["data-src"] = tag["src"] tag["src"] = "/i/l.webp" tag['alt'] = f'![]({tag["data-src"]})' if tag.parent.name != 'a': a = soup.new_tag("a", href=tag["data-src"]) if not is_site_url(a["href"]): a["rel"] = "nofollow noopener" a["target"] = "_blank" tag = tag.replace_with(a) a.append(tag) for tag in soup.find_all("a"): if not tag.contents or not str(tag.contents[0]).strip(): tag.extract() if tag.get("href") and fishylinks_regex.fullmatch(str(tag.string)): tag.string = tag["href"] sanitized = str(soup) sanitized = spoiler_regex.sub(r'
\1 ', sanitized) marseys_used = set() emojis = list(emoji_regex.finditer(sanitized)) if len(emojis) > 20: golden = False captured = [] for i in emojis: if i.group(0) in captured: continue captured.append(i.group(0)) old = i.group(0) if 'marseylong1' in old or 'marseylong2' in old or 'marseyllama1' in old or 'marseyllama2' in old: new = old.lower().replace(">", " class='mb-0'>") else: new = old.lower() new = render_emoji(new, emoji_regex2, golden, marseys_used, True) sanitized = sanitized.replace(old, new) emojis = list(emoji_regex2.finditer(sanitized)) if len(emojis) > 20: golden = False sanitized = render_emoji(sanitized, emoji_regex2, golden, marseys_used) sanitized = sanitized.replace('&','&') captured = [] for i in youtube_regex.finditer(sanitized): if i.group(0) in captured: continue captured.append(i.group(0)) params = parse_qs(urlparse(i.group(2)).query, keep_blank_values=True) t = params.get('t', params.get('start', [0]))[0] if isinstance(t, str): t = t.replace('s','') htmlsource = f'{i.group(1)}' sanitized = sanitized.replace(i.group(0), htmlsource) sanitized = video_sub_regex.sub(r'\1', sanitized) sanitized = audio_sub_regex.sub(r'\1', sanitized) if count_marseys: for marsey in g.db.query(Marsey).filter(Marsey.submitter_id==None, Marsey.name.in_(marseys_used)).all(): marsey.count += 1 g.db.add(marsey) sanitized = sanitized.replace('', '') sanitized = sanitized.replace('','').replace('','') css_sanitizer = CSSSanitizer(allowed_css_properties=allowed_styles) sanitized = bleach.Cleaner(tags=allowed_tags, attributes=allowed_attributes, protocols=['http', 'https'], css_sanitizer=css_sanitizer, filters=[partial(LinkifyFilter, skip_tags=["pre"], parse_email=False, callbacks=[callback], url_re=url_re)] ).clean(sanitized) soup = BeautifulSoup(sanitized, 'lxml') links = soup.find_all("a") domain_list = set() for link in links: href = link.get("href") if not href: continue url = urlparse(href) d = tldextract.extract(href).registered_domain + url.path domain_list.add(d.lower()) banned_domains = g.db.query(BannedDomain).all() for x in banned_domains: for y in domain_list: if y.startswith(x.domain): abort(403, f'Remove the banned link "{x.domain}" and try again!\nReason for link ban: "{x.reason}"') if ' ' not in sanitized and not sidebar: sanitized = sanitized.replace('\n','') if showmore and len(sanitized) > 3500: sanitized = showmore_regex.sub(r'\1\2 ', sanitized, count=1) return sanitized.strip() def allowed_attributes_emojis(tag, name, value): if tag == 'img': if name == 'src' and value.startswith('/') and '\\' not in value: return True if name == 'loading' and value == 'lazy': return True if name == 'data-bs-toggle' and value == 'tooltip': return True if name in {'g','glow'} and not value: return True if name in {'alt','title'}: return True if tag == 'span': if name == 'data-bs-toggle' and value == 'tooltip': return True if name == 'title': return True if name == 'alt': return True return False @with_sigalrm_timeout(1) def filter_emojis_only(title, golden=True, count_marseys=False, graceful=False, torture=False): title = title.strip() if torture: title = torture_ap(title, g.v.username) title = title.replace('','').replace('','').replace("\ufeff", "").replace("𒐪","").replace("\n", "").replace("\r", "").replace("\t", "").replace("&", "&").replace('<','<').replace('>','>').replace('"', '"').replace("'", "'").strip() marseys_used = set() title = render_emoji(title, emoji_regex3, golden, marseys_used) if count_marseys: for marsey in g.db.query(Marsey).filter(Marsey.submitter_id==None, Marsey.name.in_(marseys_used)).all(): marsey.count += 1 g.db.add(marsey) title = strikethrough_regex.sub(r'\1\2', title) title = bleach.clean(title, tags=['img','del','span'], attributes=allowed_attributes_emojis, protocols=['http','https']).replace('\n','').strip() if len(title) > POST_TITLE_HTML_LENGTH_LIMIT and not graceful: abort(400) else: return title def normalize_url(url): url = reddit_domain_regex.sub(r'\1https://old.reddit.com/\3/', url) url = url.replace("https://youtu.be/", "https://youtube.com/watch?v=") \ .replace("https://music.youtube.com/watch?v=", "https://youtube.com/watch?v=") \ .replace("https://www.youtube.com", "https://youtube.com") \ .replace("https://youtube.com/shorts/", "https://youtube.com/watch?v=") \ .replace("https://youtube.com/v/", "https://youtube.com/watch?v=") \ .replace("https://mobile.twitter.com", "https://twitter.com") \ .replace("https://m.facebook.com", "https://facebook.com") \ .replace("https://m.wikipedia.org", "https://wikipedia.org") \ .replace("https://m.youtube.com", "https://youtube.com") \ .replace("https://www.twitter.com", "https://twitter.com") \ .replace("https://www.instagram.com", "https://instagram.com") \ .replace("https://www.tiktok.com", "https://tiktok.com") \ .replace("https://www.streamable.com", "https://streamable.com") \ .replace("https://streamable.com/", "https://streamable.com/e/") \ .replace("https://streamable.com/e/e/", "https://streamable.com/e/") \ .replace("https://search.marsey.cat/#", "https://camas.unddit.com/#") \ .replace("https://imgur.com/", "https://i.imgur.com/") \ .replace("https://nitter.net/", "https://twitter.com/") \ .replace("https://nitter.42l.fr/", "https://twitter.com/") \ .replace("https://nitter.lacontrevoie.fr/", "https://twitter.com/") \ .replace("/giphy.gif", "/giphy.webp") url = imgur_regex.sub(r'\1_d.webp?maxwidth=9999&fidelity=grand', url) url = giphy_regex.sub(r'\1.webp', url) return url def validate_css(css): if '@import' in css: return False, "@import statements are not allowed!" for i in css_url_regex.finditer(css): url = i.group(1) if not is_safe_url(url): domain = tldextract.extract(url).registered_domain return False, f"The domain '{domain}' is not allowed, please use one of these domains\n\n{approved_embed_hosts}." return True, "" def sanitize_poll_options(v:User, body:str, allow_bets:bool) -> tuple[str, List[Any], List[Any], List[Any]]: def sanitize_poll_type(body:str, re:re.Pattern) -> tuple[str, List[str]]: opts = [] for i in list(re.finditer(body))[:POLL_MAX_OPTIONS] if POLL_MAX_OPTIONS else list(re.finditer(body)): opts.append(filter_emojis_only(i.group(1))) body = body.replace(i.group(0), "") return (body, opts) bets = [] if allow_bets and v and v.admin_level >= PERMS['POST_BETS']: body, bets = sanitize_poll_type(body, bet_regex) body, options = sanitize_poll_type(body, poll_regex) body, choices = sanitize_poll_type(body, choice_regex) return (body, bets, options, choices)