import functools import random import re import signal from functools import partial from os import path, listdir 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','wiki','tech','cooking' ) 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 = ':{0}:' emoji_partial = ':{0}:' 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 chud_images = listdir("files/assets/images/chud") chud_images = [f'![](/i/chud/{f})' for f in chud_images] chud_images.extend([':#trumpjaktalking:', ':#reposthorse:']) def handle_youtube_links(url): html = None params = parse_qs(urlparse(url).query, keep_blank_values=True) id = params.get('v')[0] t = None split = id.split('?t=') if len(split) == 2: id = split[0] t = split[1] if yt_id_regex.fullmatch(id): if not t: t = params.get('t', params.get('start', [0]))[0] if isinstance(t, str): t = t.replace('s','') split = t.split('m') if len(split) == 2: minutes = int(split[0]) seconds = int(split[1]) t = minutes*60 + seconds html = f'' return html @with_sigalrm_timeout(10) def sanitize(sanitized, golden=True, limit_pings=0, showmore=True, count_marseys=False, torture=False, sidebar=False, snappy=False, chat=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(chud_images) sanitized += f'\n{to_add}' sanitized = normalize_url(sanitized) sanitized = twitter_regex.sub(r'\1', 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)', 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 = underscore_in_link_regex.sub(r'\_', 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)

			tag["data-src"] = tag["data-src"].replace('/giphy.webp', '/200w.webp')

	for tag in soup.find_all("a"):
		if not tag.contents or not str(tag.contents[0]).strip():
			tag.extract()
		if not snappy and 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))

		html = handle_youtube_links(i.group(0))
		if html:
			sanitized = sanitized.replace(i.group(0), html)

	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()) def error(error): if chat: return error, 403 else: abort(403, error) banned_domains = g.db.query(BannedDomain).all() for x in banned_domains: for y in domain_list: if y.startswith(x.domain): return error(f'Remove the banned link "{x.domain}" and try again!\nReason for link ban: "{x.reason}"') if discord_username_regex.match(sanitized): return error("Stop grooming!") if '
' not in sanitized and not sidebar:
		sanitized = sanitized.replace('\n','')

	if showmore:
		# Insert a show more button if the text is too long or has too many paragraphs
		CHARLIMIT = 3000
		pos = 0
		for _ in range(20):
			pos = sanitized.find('

', pos + 4) if pos < 0: break if (pos < 0 and len(sanitized) > CHARLIMIT) or pos > CHARLIMIT: pos = CHARLIMIT - 500 if pos >= 0: sanitized = (sanitized[:pos] + showmore_regex.sub(r'\1

\2', sanitized[pos:], 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("'", "'").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://m.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://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)