Tulir Asokan
127 lines
4.9 KiB
Python
127 lines
4.9 KiB
Python
# mautrix-telegram - A Matrix-Telegram puppeting bridge
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# Copyright (C) 2021 Tulir Asokan
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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from typing import Optional, Deque, Dict, Tuple, TYPE_CHECKING
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from collections import deque
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import hashlib
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from telethon.tl.patched import Message, MessageService
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from telethon.tl.types import (MessageMediaContact, MessageMediaDocument, MessageMediaGeo,
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MessageMediaPhoto, TypeMessage, TypeUpdates, UpdateNewMessage,
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UpdateNewChannelMessage)
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from mautrix.types import EventID
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from ..types import TelegramID
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if TYPE_CHECKING:
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from ..portal import Portal
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DedupMXID = Tuple[EventID, TelegramID]
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class PortalDedup:
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pre_db_check: bool = False
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cache_queue_length: int = 20
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_dedup: Deque[str]
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_dedup_mxid: Dict[str, DedupMXID]
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_dedup_action: Deque[str]
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_portal: 'Portal'
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def __init__(self, portal: 'Portal') -> None:
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self._dedup = deque()
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self._dedup_mxid = {}
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self._dedup_action = deque()
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self._portal = portal
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@property
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def _always_force_hash(self) -> bool:
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return self._portal.peer_type == 'chat'
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@staticmethod
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def _hash_event(event: TypeMessage) -> str:
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# Non-channel messages are unique per-user (wtf telegram), so we have no other choice than
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# to deduplicate based on a hash of the message content.
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# The timestamp is only accurate to the second, so we can't rely solely on that either.
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if isinstance(event, MessageService):
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hash_content = [event.date.timestamp(), event.from_id, event.action]
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else:
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hash_content = [event.date.timestamp(), event.message.strip()]
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if event.fwd_from:
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hash_content += [event.fwd_from.from_id]
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elif isinstance(event, Message) and event.media:
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try:
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hash_content += {
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MessageMediaContact: lambda media: [media.user_id],
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MessageMediaDocument: lambda media: [media.document.id],
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MessageMediaPhoto: lambda media: [media.photo.id if media.photo else 0],
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MessageMediaGeo: lambda media: [media.geo.long, media.geo.lat],
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}[type(event.media)](event.media)
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except KeyError:
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pass
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return hashlib.md5("-"
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.join(str(a) for a in hash_content)
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.encode("utf-8")
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).hexdigest()
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def check_action(self, event: TypeMessage) -> bool:
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evt_hash = self._hash_event(event) if self._always_force_hash else event.id
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if evt_hash in self._dedup_action:
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return True
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self._dedup_action.append(evt_hash)
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if len(self._dedup_action) > self.cache_queue_length:
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self._dedup_action.popleft()
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return False
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def update(self, event: TypeMessage, mxid: DedupMXID = None,
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expected_mxid: Optional[DedupMXID] = None, force_hash: bool = False
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) -> Optional[DedupMXID]:
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evt_hash = self._hash_event(event) if self._always_force_hash or force_hash else event.id
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try:
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found_mxid = self._dedup_mxid[evt_hash]
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except KeyError:
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return EventID("None"), TelegramID(0)
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if found_mxid != expected_mxid:
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return found_mxid
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self._dedup_mxid[evt_hash] = mxid
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return None
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def check(self, event: TypeMessage, mxid: DedupMXID = None, force_hash: bool = False
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) -> Optional[DedupMXID]:
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evt_hash = (self._hash_event(event)
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if self._always_force_hash or force_hash
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else event.id)
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if evt_hash in self._dedup:
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return self._dedup_mxid[evt_hash]
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self._dedup_mxid[evt_hash] = mxid
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self._dedup.append(evt_hash)
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if len(self._dedup) > self.cache_queue_length:
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del self._dedup_mxid[self._dedup.popleft()]
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return None
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def register_outgoing_actions(self, response: TypeUpdates) -> None:
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for update in response.updates:
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check_dedup = (isinstance(update, (UpdateNewMessage, UpdateNewChannelMessage))
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and isinstance(update.message, MessageService))
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if check_dedup:
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self.check(update.message)
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