480 lines
16 KiB
Python
480 lines
16 KiB
Python
import functools
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import bleach
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from bs4 import BeautifulSoup
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from bleach.css_sanitizer import CSSSanitizer
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from bleach.linkifier import LinkifyFilter
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from functools import partial
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from .get import *
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from os import path, environ
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import re
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from mistletoe import markdown
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from json import loads, dump
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from random import random, choice
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import signal
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import time
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import requests
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allowed_tags = ('b','blockquote','br','code','del','em','h1','h2','h3','h4','h5','h6','hr','i',
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'li','ol','p','pre','strong','sub','sup','table','tbody','th','thead','td','tr','ul',
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'marquee','a','span','ruby','rp','rt','spoiler','img','lite-youtube','video','source','audio','g')
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allowed_styles = ['color', 'background-color', 'font-weight', 'text-align', 'filter',]
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def allowed_attributes(tag, name, value):
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if name == 'style': return True
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if tag == 'marquee':
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if name in ['direction', 'behavior', 'scrollamount']: return True
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if name in {'height', 'width'}:
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try: value = int(value.replace('px', ''))
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except: return False
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if 0 < value <= 250: return True
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return False
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if tag == 'a':
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if name == 'href' and '\\' not in value and 'xn--' not in value:
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return True
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if name == 'rel' and value == 'nofollow noopener noreferrer': return True
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if name == 'target' and value == '_blank': return True
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return False
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if tag == 'img':
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if name in ['src','data-src']: return is_safe_url(value)
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if name == 'loading' and value == 'lazy': return True
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if name == 'data-bs-toggle' and value == 'tooltip': return True
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if name in ['g','b','glow'] and not value: return True
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if name in ['alt','title']: return True
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if name == 'referrerpolicy' and value == 'no-referrer': return True
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return False
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if tag == 'lite-youtube':
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if name == 'params' and value.startswith('autoplay=1&modestbranding=1'): return True
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if name == 'videoid': return True
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return False
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if tag == 'video':
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if name == 'controls' and value == '': return True
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if name == 'preload' and value == 'none': return True
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return False
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if tag == 'source':
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if name == 'src': return is_safe_url(value)
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if tag == 'audio':
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if name == 'src': return is_safe_url(value)
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if name == 'controls' and value == '': return True
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if name == 'preload' and value == 'none': return True
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return False
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if tag == 'p':
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if name == 'class' and value == 'mb-0': return True
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return False
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if tag == 'span':
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if name == 'data-bs-toggle' and value == 'tooltip': return True
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if name == 'title': return True
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if name == 'alt': return True
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return False
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def build_url_re(protocols):
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"""Builds the url regex used by linkifier
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If you want a different set of tlds or allowed protocols, pass those in
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and stomp on the existing ``url_re``::
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from bleach import linkifier
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my_url_re = linkifier.build_url_re(my_tlds_list, my_protocols)
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linker = LinkifyFilter(url_re=my_url_re)
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"""
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return re.compile(
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r"""\(*# Match any opening parentheses.
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\b(?<![@.])(?:(?:{0}):/{{0,3}}(?:(?:\w+:)?\w+@)?)?# http://
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([\w-]+\.)+(?:[A-Za-z]{{2,20}})(?:\:[0-9]+)?(?!\.\w)\b# xx.yy.tld(:##)?
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(?:[/?][^#\s\{{\}}\|\\\^\[\]`<>"]*)?
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# /path/zz (excluding "unsafe" chars from RFC 1738,
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# except for ~, which happens in practice)
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(?:\#[^#\s\|\\\^\[\]`<>"]*)?
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# #hash (excluding "unsafe" chars from RFC 1738,
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# except for ~, which happens in practice)
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""".format("|".join(sorted(protocols))),
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re.IGNORECASE | re.VERBOSE | re.UNICODE,
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)
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url_re = build_url_re(protocols=['http', 'https'])
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def callback(attrs, new=False):
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if (None, "href") not in attrs:
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return # Incorrect <a> tag
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href = attrs[(None, "href")]
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# \ in href right after / makes most browsers ditch site hostname and allows for a host injection bypassing the check, see <a href="/\google.com">cool</a>
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if "\\" in href or not ascii_only_regex.fullmatch(href):
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attrs["_text"] = href # Laugh at this user
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del attrs[(None, "href")] # Make unclickable and reset harmful payload
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return attrs
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if not href.startswith('/') and not href.startswith(f'{SITE_FULL}/'):
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attrs[(None, "target")] = "_blank"
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attrs[(None, "rel")] = "nofollow noopener noreferrer"
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return attrs
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def render_emoji(html, regexp, golden, marseys_used, b=False):
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emojis = list(regexp.finditer(html))
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captured = set()
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for i in emojis:
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if i.group(0) in captured: continue
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captured.add(i.group(0))
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emoji = i.group(1).lower()
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attrs = ''
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if b: attrs += ' b'
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if golden and len(emojis) <= 20 and ('marsey' in emoji or emoji in marseys_const2):
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if random() < 0.0025: attrs += ' g'
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elif random() < 0.00125: attrs += ' glow'
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old = emoji
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emoji = emoji.replace('!','').replace('#','')
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if emoji == 'marseyrandom': emoji = choice(marseys_const2)
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emoji_partial_pat = '<img loading="lazy" alt=":{0}:" src="{1}"{2}>'
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emoji_partial = '<img loading="lazy" data-bs-toggle="tooltip" alt=":{0}:" title=":{0}:" src="{1}"{2}>'
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emoji_html = None
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if emoji.endswith('pat') and emoji != 'marseyunpettablepat':
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if path.isfile(f"files/assets/images/emojis/{emoji.replace('pat','')}.webp"):
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emoji_html = f'<span data-bs-toggle="tooltip" alt=":{old}:" title=":{old}:"><img src="/i/hand.webp">{emoji_partial_pat.format(old, f"/e/{emoji[:-3]}.webp", attrs)}</span>'
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elif emoji.startswith('@'):
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if u := get_user(emoji[1:-3], graceful=True):
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emoji_html = f'<span data-bs-toggle="tooltip" alt=":{old}:" title=":{old}:"><img src="/i/hand.webp">{emoji_partial_pat.format(old, f"/pp/{u.id}", attrs)}</span>'
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elif path.isfile(f'files/assets/images/emojis/{emoji}.webp'):
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emoji_html = emoji_partial.format(old, f'/e/{emoji}.webp', attrs)
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if emoji_html:
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marseys_used.add(emoji)
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html = re.sub(f'(?<!"){i.group(0)}', emoji_html, html)
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return html
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def with_sigalrm_timeout(timeout: int):
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'Use SIGALRM to raise an exception if the function executes for longer than timeout seconds'
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# while trying to test this using time.sleep I discovered that gunicorn does in fact do some
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# async so if we timeout on that (or on a db op) then the process is crashed without returning
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# a proper 500 error. Oh well.
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def sig_handler(signum, frame):
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print("Timeout!", flush=True)
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raise Exception("Timeout")
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def inner(func):
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@functools.wraps(func)
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def wrapped(*args, **kwargs):
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signal.signal(signal.SIGALRM, sig_handler)
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signal.alarm(timeout)
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try:
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return func(*args, **kwargs)
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finally:
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signal.alarm(0)
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return wrapped
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return inner
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def sanitize_raw_title(sanitized):
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if not sanitized: return ""
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sanitized = sanitized.replace('\u200e','').replace('\u200b','').replace("\ufeff", "").replace("\r","").replace("\n", "")
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sanitized = sanitized.strip()
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return sanitized[:POST_TITLE_LENGTH_LIMIT]
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def sanitize_raw_body(sanitized):
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if not sanitized: return ""
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sanitized = sanitized.replace('\u200e','').replace('\u200b','').replace("\ufeff", "").replace("\r\n", "\n")
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sanitized = sanitized.strip()
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return sanitized[:POST_BODY_LENGTH_LIMIT]
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@with_sigalrm_timeout(5)
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def sanitize(sanitized, golden=True, limit_pings=0, showmore=True, count_marseys=False, torture=False):
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sanitized = sanitized.strip()
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sanitized = utm_regex.sub('', sanitized)
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sanitized = utm_regex2.sub('', sanitized)
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if torture:
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sanitized = torture_ap(sanitized, g.v.username)
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sanitized += '\n:#trumpjaktalking:'
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sanitized = normalize_url(sanitized)
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if '```' not in sanitized and '<pre>' not in sanitized:
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sanitized = linefeeds_regex.sub(r'\1\n\n\2', sanitized)
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sanitized = greentext_regex.sub(r'\1<g>\>\2</g>', sanitized)
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sanitized = image_regex.sub(r'\1\5', sanitized)
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sanitized = image_check_regex.sub(r'\1', sanitized)
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sanitized = link_fix_regex.sub(r'\1https://\2', sanitized)
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if FEATURES['MARKUP_COMMANDS']:
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sanitized = command_regex.sub(command_regex_matcher, sanitized)
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sanitized = markdown(sanitized)
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sanitized = strikethrough_regex.sub(r'\1<del>\2</del>', sanitized)
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sanitized = sanitized.replace('\u200e','').replace('\u200b','').replace("\ufeff", "").replace("𒐪","").replace("\u0589", ":")
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sanitized = reddit_regex.sub(r'\1<a href="https://old.reddit.com/\2" rel="nofollow noopener noreferrer" target="_blank">/\2</a>', sanitized)
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sanitized = sub_regex.sub(r'\1<a href="/\2">/\2</a>', sanitized)
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v = getattr(g, 'v', None)
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names = set(m.group(2) for m in mention_regex.finditer(sanitized))
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if limit_pings and len(names) > limit_pings and not v.admin_level: abort(406)
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users_list = get_users(names, graceful=True)
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users_dict = {}
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for u in users_list:
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users_dict[u.username.lower()] = u
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if u.original_username:
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users_dict[u.original_username.lower()] = u
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def replacer(m):
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u = users_dict.get(m.group(2).lower())
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if not u:
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return m.group(0)
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return f'{m.group(1)}<a href="/id/{u.id}"><img loading="lazy" src="/pp/{u.id}">@{u.username}</a>'
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sanitized = mention_regex.sub(replacer, sanitized)
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soup = BeautifulSoup(sanitized, 'lxml')
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for tag in soup.find_all("img"):
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if tag.get("src") and not tag["src"].startswith('/pp/'):
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if not is_safe_url(tag["src"]):
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a = soup.new_tag("a", href=tag["src"], rel="nofollow noopener noreferrer", target="_blank")
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a.string = tag["src"]
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tag.replace_with(a)
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continue
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tag["loading"] = "lazy"
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tag["data-src"] = tag["src"]
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tag["src"] = "/i/l.webp"
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tag['alt'] = f'![]({tag["data-src"]})'
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if not is_site_url(tag["data-src"]):
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tag['referrerpolicy'] = "no-referrer"
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if tag.parent.name != 'a':
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a = soup.new_tag("a", href=tag["data-src"])
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if not is_site_url(a["href"]):
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a["rel"] = "nofollow noopener noreferrer"
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a["target"] = "_blank"
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tag = tag.replace_with(a)
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a.append(tag)
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for tag in soup.find_all("a"):
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if not tag.contents or not str(tag.contents[0]).strip():
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tag.extract()
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if tag.get("href") and fishylinks_regex.fullmatch(str(tag.string)):
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tag.string = tag["href"]
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sanitized = str(soup)
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sanitized = spoiler_regex.sub(r'<spoiler>\1</spoiler>', sanitized)
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marseys_used = set()
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emojis = list(emoji_regex.finditer(sanitized))
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if len(emojis) > 20: golden = False
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captured = []
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for i in emojis:
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if i.group(0) in captured: continue
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captured.append(i.group(0))
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old = i.group(0)
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if 'marseylong1' in old or 'marseylong2' in old or 'marseyllama1' in old or 'marseyllama2' in old: new = old.lower().replace(">", " class='mb-0'>")
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else: new = old.lower()
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new = render_emoji(new, emoji_regex2, golden, marseys_used, True)
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sanitized = sanitized.replace(old, new)
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emojis = list(emoji_regex2.finditer(sanitized))
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if len(emojis) > 20: golden = False
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sanitized = render_emoji(sanitized, emoji_regex2, golden, marseys_used)
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sanitized = sanitized.replace('&','&')
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if "https://youtube.com/watch?v=" in sanitized: sanitized = sanitized.replace("?t=", "&t=")
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captured = []
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for i in youtube_regex.finditer(sanitized):
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if i.group(0) in captured: continue
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captured.append(i.group(0))
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params = parse_qs(urlparse(i.group(2)).query, keep_blank_values=True)
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t = params.get('t', params.get('start', [0]))[0]
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if isinstance(t, str): t = t.replace('s','')
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htmlsource = f'{i.group(1)}<lite-youtube videoid="{i.group(3)}" params="autoplay=1&modestbranding=1'
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if t: htmlsource += f'&start={t}'
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htmlsource += '"></lite-youtube>'
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sanitized = sanitized.replace(i.group(0), htmlsource)
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sanitized = video_sub_regex.sub(r'\1<video controls preload="none"><source src="\2"></video>', sanitized)
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sanitized = audio_sub_regex.sub(r'\1<audio controls preload="none" src="\2"></audio>', sanitized)
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if count_marseys:
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for marsey in g.db.query(Marsey).filter(Marsey.submitter_id==None, Marsey.name.in_(marseys_used)).all():
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marsey.count += 1
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g.db.add(marsey)
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sanitized = sanitized.replace('<p></p>', '')
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sanitized = sanitized.replace('<html><body>','').replace('</body></html>','')
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css_sanitizer = CSSSanitizer(allowed_css_properties=allowed_styles)
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sanitized = bleach.Cleaner(tags=allowed_tags,
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attributes=allowed_attributes,
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protocols=['http', 'https'],
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css_sanitizer=css_sanitizer,
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filters=[partial(LinkifyFilter, skip_tags=["pre"],
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parse_email=False, callbacks=[callback], url_re=url_re)]
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).clean(sanitized)
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soup = BeautifulSoup(sanitized, 'lxml')
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links = soup.find_all("a")
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domain_list = set()
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for link in links:
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href = link.get("href")
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if not href: continue
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url = urlparse(href)
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domain = url.netloc
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url_path = url.path
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domain_list.add(domain+url_path)
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parts = domain.split(".")
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for i in range(len(parts)):
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new_domain = parts[i]
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for j in range(i + 1, len(parts)):
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new_domain += "." + parts[j]
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domain_list.add(new_domain)
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bans = g.db.query(BannedDomain.domain).filter(BannedDomain.domain.in_(list(domain_list))).all()
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if bans: abort(403, description=f"Remove the banned domains {bans} and try again!")
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if '<pre>' not in sanitized:
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sanitized = sanitized.replace('\n','')
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if showmore and len(sanitized) > 3500:
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sanitized = showmore_regex.sub(r'\1<p><button class="showmore" onclick="showmore()">SHOW MORE</button></p><d class="d-none">\2</d>', sanitized, count=1)
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return sanitized.strip()
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def allowed_attributes_emojis(tag, name, value):
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if tag == 'img':
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if name == 'src' and value.startswith('/') and '\\' not in value: return True
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if name == 'loading' and value == 'lazy': return True
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if name == 'data-bs-toggle' and value == 'tooltip': return True
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if name in ['g','glow'] and not value: return True
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if name in ['alt','title']: return True
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if tag == 'span':
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if name == 'data-bs-toggle' and value == 'tooltip': return True
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if name == 'title': return True
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if name == 'alt': return True
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return False
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return False
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@with_sigalrm_timeout(1)
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def filter_emojis_only(title, golden=True, count_marseys=False, graceful=False, torture=False):
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title = title.strip()
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if torture:
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title = torture_ap(title, g.v.username)
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title = title.replace('','').replace('','').replace("\ufeff", "").replace("𒐪","").replace("\n", "").replace("\r", "").replace("\t", "").replace("&", "&").replace('<','<').replace('>','>').replace('"', '"').replace("'", "'").strip()
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marseys_used = set()
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title = render_emoji(title, emoji_regex3, golden, marseys_used)
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if count_marseys:
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for marsey in g.db.query(Marsey).filter(Marsey.submitter_id==None, Marsey.name.in_(marseys_used)).all():
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marsey.count += 1
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g.db.add(marsey)
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title = strikethrough_regex.sub(r'\1<del>\2</del>', title)
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title = bleach.clean(title, tags=['img','del','span'], attributes=allowed_attributes_emojis, protocols=['http','https']).replace('\n','').strip()
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if len(title) > POST_TITLE_HTML_LENGTH_LIMIT and not graceful: abort(400)
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else: return title
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def normalize_url(url):
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url = reddit_domain_regex.sub(r'\1https://old.reddit.com/\3/', url)
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url = url.replace("https://youtu.be/", "https://youtube.com/watch?v=") \
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.replace("https://music.youtube.com/watch?v=", "https://youtube.com/watch?v=") \
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.replace("https://www.youtube.com", "https://youtube.com") \
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.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/")
|
||
|
||
url = imgur_regex.sub(r'\1_d.webp?maxwidth=9999&fidelity=high', 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, ""
|