cbcc2aac6f
This change disables multimedia embedding: - In comments and comments replies. - In new submissions. - In comment & submission preview And it's all toggle-able via an envvar, except for the JS bits, but I linked those to the github issue, so should be easy to find in the future. The way it works is: - removes markdown image/video syntax, eg. `` into `` - changes link text into anchors, eg. `https://example.org/someimage.jpg` into `[https://example.org/someimage.jpg](https://example.org/someimage.jpg)` - removes html img/video/audio tags, eg. `<img href="https://example.org/someimage.jpg" />` into `` - when embedding gifs via the giphy modal in "new submission", it will insert only an anchor to the gif - when attaching an image, it will upload the image, then add only an anchor to the post/comment body I tested this manually, but not sure if I got all the test cases. What I checked was: - create comment w/ image/video/audio media using markdown -> success - create comment reply w/ image/video/audio media using markdown -> success - create comment w/ link to img/imgur/youtube/audio -> success - create comment w/ attachment -> success - create comment reply w/ attachment -> success - create comment w/ img/video tag -> success - create comment reply w/ image/video tag -> success - create post submission w/ image/video/media using markdown -> success - create post submission w/ link to img/imgur/youtube/audio -> success - create post submission w/ attachment -> success - create post submission w/ giphy gif -> success Also, updated the formatting page. Co-authored-by: Ben Rog-Wilhelm <zorba-github@pavlovian.net>
349 lines
14 KiB
Python
349 lines
14 KiB
Python
import bleach
|
||
from bs4 import BeautifulSoup
|
||
from bleach.linkifier import LinkifyFilter, build_url_re
|
||
from functools import partial
|
||
from .get import *
|
||
from os import path, environ
|
||
import re
|
||
from mistletoe import markdown
|
||
from json import loads, dump
|
||
from random import random, choice
|
||
import signal
|
||
import time
|
||
import requests
|
||
from files.__main__ import app
|
||
|
||
TLDS = ('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','club','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','win','ws','xn','xxx','xyz','ye','yt','yu','za','zm','zw', 'moe')
|
||
|
||
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',)
|
||
|
||
if app.config['MULTIMEDIA_EMBEDDING_ENABLED']:
|
||
allowed_tags += ('img', 'lite-youtube', 'video', 'source',)
|
||
|
||
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
|
||
return False
|
||
|
||
if tag == 'a':
|
||
if name == 'href': return True
|
||
if name == 'rel' and value == 'nofollow noopener noreferrer': return True
|
||
if name == 'target' and value == '_blank': return True
|
||
return False
|
||
|
||
if tag == 'img':
|
||
if name in ['src','data-src']:
|
||
if value.startswith('/') or value.startswith(f'{SITE_FULL}/') or embed_fullmatch_regex.fullmatch(value): return True
|
||
else: return False
|
||
|
||
if name == 'loading' and value == 'lazy': return True
|
||
if name == 'referrpolicy' and value == 'no-referrer': return True
|
||
if name == 'data-bs-toggle' and value == 'tooltip': return True
|
||
if name in ['alt','title','g','b','pat']: return True
|
||
if name == 'class' and value == 'pat-hand': return True
|
||
return False
|
||
|
||
if tag == 'lite-youtube':
|
||
if name == 'params' and value.startswith('autoplay=1&modestbranding=1'): return True
|
||
if name == 'videoid': return True
|
||
return False
|
||
|
||
if tag == 'video':
|
||
if name == 'controls' and value == '': return True
|
||
if name == 'preload' and value == 'none': return True
|
||
return False
|
||
|
||
if tag == 'source':
|
||
if name == 'src' and embed_fullmatch_regex.fullmatch(value): return True
|
||
return False
|
||
|
||
if tag == 'p':
|
||
if name == 'class' and value == 'mb-0': return True
|
||
return False
|
||
|
||
if tag == 'span':
|
||
if name == 'class' and value in ['pat-container', 'pat-hand']: return True
|
||
if name == 'data-bs-toggle' and value == 'tooltip': return True
|
||
if name == 'title': return True
|
||
if name == 'alt': return True
|
||
return False
|
||
|
||
|
||
url_re = build_url_re(tlds=TLDS, protocols=['http', 'https'])
|
||
|
||
def callback(attrs, new=False):
|
||
href = attrs[(None, "href")]
|
||
|
||
if not href.startswith('/') and not href.startswith(f'{SITE_FULL}/'):
|
||
attrs[(None, "target")] = "_blank"
|
||
attrs[(None, "rel")] = "nofollow noopener noreferrer"
|
||
|
||
return attrs
|
||
|
||
|
||
def handler(signum, frame):
|
||
print("Timeout!")
|
||
raise Exception("Timeout")
|
||
|
||
def render_emoji(html, regexp, edit, marseys_used=set(), 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 not edit and len(emojis) <= 20 and random() < 0.0025 and ('marsey' in emoji or emoji in marseys_const2): attrs += ' g'
|
||
|
||
old = emoji
|
||
emoji = emoji.replace('!','').replace('#','')
|
||
if emoji == 'marseyrandom': emoji = choice(marseys_const2)
|
||
|
||
emoji_partial_pat = '<img loading="lazy" alt=":{0}:" src="{1}"{2}>'
|
||
emoji_partial = '<img loading="lazy" data-bs-toggle="tooltip" alt=":{0}:" title=":{0}:" src="{1}"{2}>'
|
||
emoji_html = None
|
||
|
||
if emoji.endswith('pat'):
|
||
if path.isfile(f"files/assets/images/emojis/{emoji.replace('pat','')}.webp"):
|
||
attrs += ' pat'
|
||
emoji_html = f'<span class="pat-container" data-bs-toggle="tooltip" alt=":{old}:" title=":{old}:"><img src="/assets/images/hand.webp" class="pat-hand">{emoji_partial_pat.format(old, f"/e/{emoji[:-3]}.webp", attrs)}</span>'
|
||
elif emoji.startswith('@'):
|
||
if u := get_user(emoji[1:-3], graceful=True):
|
||
attrs += ' pat'
|
||
emoji_html = f'<span class="pat-container" data-bs-toggle="tooltip" alt=":{old}:" title=":{old}:"><img src="/assets/images/hand.webp" class="pat-hand">{emoji_partial_pat.format(old, f"/pp/{u.id}", attrs)}</span>'
|
||
elif path.isfile(f'files/assets/images/emojis/{emoji}.webp'):
|
||
emoji_html = emoji_partial.format(old, f'/e/{emoji}.webp', attrs)
|
||
|
||
|
||
if emoji_html:
|
||
html = re.sub(f'(?<!"){i.group(0)}', emoji_html, html)
|
||
return html
|
||
|
||
|
||
def sanitize(sanitized, alert=False, comment=False, edit=False):
|
||
|
||
signal.signal(signal.SIGALRM, handler)
|
||
signal.alarm(1)
|
||
|
||
# double newlines, eg. hello\nworld becomes hello\n\nworld, which later becomes <p>hello</p><p>world</p>
|
||
sanitized = linefeeds_regex.sub(r'\1\n\n\2', sanitized)
|
||
|
||
if app.config['MULTIMEDIA_EMBEDDING_ENABLED']:
|
||
# turn eg. https://wikipedia.org/someimage.jpg into 
|
||
sanitized = image_regex.sub(r'\1\4', sanitized)
|
||
|
||
# if image url in whitelist, do nothing
|
||
# eg.  turns into 
|
||
# but if not, then extract url
|
||
# eg  turns into https://example.org/someimage.jpg
|
||
sanitized = image_check_regex.sub(r'\1', sanitized)
|
||
|
||
# transform markdown into html
|
||
sanitized = markdown(sanitized)
|
||
|
||
# turn ~something~ or ~~something~~ into <del>something</del>
|
||
sanitized = strikethrough_regex.sub(r'<del>\1</del>', sanitized)
|
||
|
||
# remove left-to-right mark; remove zero width space; remove zero width no-break space; remove Cuneiform Numeric Sign Eight;
|
||
sanitized = sanitized.replace('','').replace('','').replace("\ufeff", "").replace("𒐪","")
|
||
|
||
if alert:
|
||
matches = { g.group(1):g for g in mention_regex2.finditer(sanitized) if g }
|
||
users = get_users(matches.keys(),graceful=True)
|
||
|
||
captured = []
|
||
for u in users:
|
||
if u:
|
||
i = matches.get(u.username) or matches.get(u.original_username)
|
||
if i.group(0) not in captured:
|
||
captured.append(i.group(0))
|
||
sanitized = sanitized.replace(i.group(0), f'''<p><a href="/id/{u.id}"><img loading="lazy" src="/pp/{u.id}">@{u.username}</a>''')
|
||
else:
|
||
sanitized = reddit_regex.sub(r'\1<a href="https://old.reddit.com/\2" rel="nofollow noopener noreferrer">/\2</a>', sanitized)
|
||
sanitized = sub_regex.sub(r'\1<a href="/\2">/\2</a>', sanitized)
|
||
|
||
matches = [ m for m in mention_regex.finditer(sanitized) if m ]
|
||
names = set( m.group(2) for m in matches )
|
||
users = get_users(names,graceful=True)
|
||
|
||
if len(users) > app.config['MENTION_LIMIT']:
|
||
signal.alarm(0)
|
||
abort(
|
||
make_response(
|
||
jsonify(
|
||
error=f'Mentioned {len(users)} users but limit is {app.config["MENTION_LIMIT"]}'), 400))
|
||
|
||
for u in users:
|
||
if not u: continue
|
||
m = [ m for m in matches if u.username == m.group(2) or u.original_username == m.group(2) ]
|
||
for i in m:
|
||
if not (g.v and g.v.any_block_exists(u)) or g.v.admin_level > 1:
|
||
sanitized = sanitized.replace(i.group(0), f'''{i.group(1)}<a href="/id/{u.id}"><img loading="lazy" src="/pp/{u.id}">@{u.username}</a>''', 1)
|
||
|
||
sanitized = imgur_regex.sub(r'\1_d.webp?maxwidth=9999&fidelity=high', sanitized)
|
||
|
||
soup = BeautifulSoup(sanitized, 'lxml')
|
||
|
||
if app.config['MULTIMEDIA_EMBEDDING_ENABLED']:
|
||
for tag in soup.find_all("img"):
|
||
if tag.get("src") and not tag["src"].startswith('/pp/'):
|
||
tag["loading"] = "lazy"
|
||
tag["data-src"] = tag["src"]
|
||
tag["src"] = "/assets/images/loading.webp"
|
||
tag['alt'] = f'![]({tag["data-src"]})'
|
||
tag['referrerpolicy'] = "no-referrer"
|
||
|
||
for tag in soup.find_all("a"):
|
||
if tag.get("href") and fishylinks_regex.fullmatch(str(tag.string)):
|
||
tag.string = tag["href"]
|
||
|
||
|
||
sanitized = str(soup)
|
||
|
||
sanitized = spoiler_regex.sub(r'<spoiler>\1</spoiler>', sanitized)
|
||
|
||
marseys_used = set()
|
||
|
||
# emojis = list(emoji_regex.finditer(sanitized))
|
||
# if len(emojis) > 20: edit = True
|
||
|
||
# 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, edit, marseys_used, True)
|
||
|
||
# sanitized = sanitized.replace(old, new)
|
||
|
||
# emojis = list(emoji_regex2.finditer(sanitized))
|
||
# if len(emojis) > 20: edit = True
|
||
|
||
# sanitized = render_emoji(sanitized, emoji_regex2, edit, marseys_used)
|
||
|
||
for rd in ["://reddit.com", "://new.reddit.com", "://www.reddit.com", "://redd.it", "://libredd.it", "://teddit.net"]:
|
||
sanitized = sanitized.replace(rd, "://old.reddit.com")
|
||
|
||
sanitized = sanitized.replace("nitter.net", "twitter.com").replace("old.reddit.com/gallery", "reddit.com/gallery").replace("https://youtu.be/", "https://youtube.com/watch?v=").replace("https://music.youtube.com/watch?v=", "https://youtube.com/watch?v=").replace("https://streamable.com/", "https://streamable.com/e/").replace("https://youtube.com/shorts/", "https://youtube.com/watch?v=").replace("https://mobile.twitter", "https://twitter").replace("https://m.facebook", "https://facebook").replace("m.wikipedia.org", "wikipedia.org").replace("https://m.youtube", "https://youtube").replace("https://www.youtube", "https://youtube").replace("https://www.twitter", "https://twitter").replace("https://www.instagram", "https://instagram").replace("https://www.tiktok", "https://tiktok")
|
||
|
||
|
||
if "https://youtube.com/watch?v=" in sanitized: sanitized = sanitized.replace("?t=", "&t=")
|
||
|
||
if app.config['MULTIMEDIA_EMBEDDING_ENABLED']:
|
||
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).replace('&','&')).query)
|
||
t = params.get('t', params.get('start', [0]))[0]
|
||
if isinstance(t, str): t = t.replace('s','')
|
||
|
||
htmlsource = f'{i.group(1)}<lite-youtube videoid="{i.group(3)}" params="autoplay=1&modestbranding=1'
|
||
if t: htmlsource += f'&start={t}'
|
||
htmlsource += '"></lite-youtube>'
|
||
|
||
sanitized = sanitized.replace(i.group(0), htmlsource)
|
||
|
||
if app.config['MULTIMEDIA_EMBEDDING_ENABLED']:
|
||
sanitized = video_sub_regex.sub(r'\1<video controls preload="none"><source src="\2"></video>', sanitized)
|
||
|
||
if comment:
|
||
for marsey in g.db.query(Marsey).filter(Marsey.name.in_(marseys_used)).all():
|
||
marsey.count += 1
|
||
g.db.add(marsey)
|
||
|
||
sanitized = sanitized.replace('&','&')
|
||
sanitized = utm_regex.sub('', sanitized)
|
||
sanitized = utm_regex2.sub('', sanitized)
|
||
|
||
|
||
sanitized = sanitized.replace('<html><body>','').replace('</body></html>','')
|
||
|
||
|
||
|
||
sanitized = bleach.Cleaner(tags=allowed_tags,
|
||
attributes=allowed_attributes,
|
||
protocols=['http', 'https'],
|
||
styles=['color', 'background-color', 'font-weight', 'text-align'],
|
||
filters=[partial(LinkifyFilter, skip_tags=["pre"], parse_email=False, callbacks=[callback], url_re=url_re)],
|
||
strip=True,
|
||
).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)
|
||
domain = url.netloc
|
||
url_path = url.path
|
||
domain_list.add(domain+url_path)
|
||
|
||
parts = domain.split(".")
|
||
for i in range(len(parts)):
|
||
new_domain = parts[i]
|
||
for j in range(i + 1, len(parts)):
|
||
new_domain += "." + parts[j]
|
||
domain_list.add(new_domain)
|
||
|
||
bans = g.db.query(BannedDomain.domain).filter(BannedDomain.domain.in_(list(domain_list))).all()
|
||
|
||
if bans: abort(403, description=f"Remove the banned domains {bans} and try again!")
|
||
|
||
signal.alarm(0)
|
||
|
||
return sanitized
|
||
|
||
|
||
|
||
|
||
|
||
def allowed_attributes_emojis(tag, name, value):
|
||
|
||
if tag == 'img':
|
||
if name == 'loading' and value == 'lazy': return True
|
||
if name == 'data-bs-toggle' and value == 'tooltip': return True
|
||
if name in ['src','alt','title','g']: return True
|
||
return False
|
||
|
||
|
||
def filter_emojis_only(title, edit=False, graceful=False):
|
||
|
||
signal.signal(signal.SIGALRM, handler)
|
||
signal.alarm(1)
|
||
|
||
title = title.replace('','').replace('','').replace("\ufeff", "").replace("𒐪","").replace("\n", "").replace("\r", "").replace("\t", "").replace("&", "&").replace('<','<').replace('>','>').replace('"', '"').replace("'", "'").strip()
|
||
|
||
# title = render_emoji(title, emoji_regex3, edit)
|
||
|
||
title = strikethrough_regex.sub(r'<del>\1</del>', title)
|
||
|
||
sanitized = bleach.clean(title, tags=['img','del'], attributes=allowed_attributes_emojis, protocols=['http','https'])
|
||
|
||
signal.alarm(0)
|
||
|
||
if len(title) > 1500 and not graceful: abort(400)
|
||
else: return title
|