diff options
Diffstat (limited to '')
| -rw-r--r-- | bot/exts/filters/filtering.py | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/bot/exts/filters/filtering.py b/bot/exts/filters/filtering.py index 79b7abe9f..8accc61f8 100644 --- a/bot/exts/filters/filtering.py +++ b/bot/exts/filters/filtering.py @@ -1,5 +1,6 @@ import asyncio import re +import unicodedata from datetime import timedelta from typing import Any, Dict, List, Mapping, NamedTuple, Optional, Tuple, Union @@ -205,15 +206,21 @@ class Filtering(Cog): delta = relativedelta(after.edited_at, before.edited_at).microseconds await self._filter_message(after, delta) - def get_name_matches(self, name: str) -> List[re.Match]: - """Check bad words from passed string (name). Return list of matches.""" - name = self.clean_input(name) - matches = [] + def get_name_match(self, name: str) -> Optional[re.Match]: + """Check bad words from passed string (name). Return the first match found.""" + normalised_name = unicodedata.normalize("NFKC", name) + cleaned_normalised_name = "".join([c for c in normalised_name if not unicodedata.combining(c)]) + + # Run filters against normalised, cleaned normalised and the original name, + # in case we have filters for one but not the other. + names_to_check = (name, normalised_name, cleaned_normalised_name) + watchlist_patterns = self._get_filterlist_items('filter_token', allowed=False) for pattern in watchlist_patterns: - if match := re.search(pattern, name, flags=re.IGNORECASE): - matches.append(match) - return matches + for name in names_to_check: + if match := re.search(pattern, name, flags=re.IGNORECASE): + return match + return None async def check_send_alert(self, member: Member) -> bool: """When there is less than 3 days after last alert, return `False`, otherwise `True`.""" @@ -229,10 +236,14 @@ class Filtering(Cog): """Send a mod alert every 3 days if a username still matches a watchlist pattern.""" # Use lock to avoid race conditions async with self.name_lock: - # Check whether the users display name contains any words in our blacklist - matches = self.get_name_matches(member.display_name) + # Check if we recently alerted about this user first, + # to avoid running all the filter tokens against their name again. + if not await self.check_send_alert(member): + return - if not matches or not await self.check_send_alert(member): + # Check whether the users display name contains any words in our blacklist + match = self.get_name_match(member.display_name) + if not match: return log.info(f"Sending bad nickname alert for '{member.display_name}' ({member.id}).") @@ -240,7 +251,7 @@ class Filtering(Cog): log_string = ( f"**User:** {format_user(member)}\n" f"**Display Name:** {escape_markdown(member.display_name)}\n" - f"**Bad Matches:** {', '.join(match.group() for match in matches)}" + f"**Bad Match:** {match.group()}" ) await self.mod_log.send_log_message( |