mirror of https://gitlab.com/litecord/litecord.git
89 lines
3.1 KiB
Python
89 lines
3.1 KiB
Python
"""
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Litecord
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Copyright (C) 2018-2021 Luna Mendes and Litecord Contributors
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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 General Public License as published by
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the Free Software Foundation, version 3 of the License.
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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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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from typing import List
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from quart import current_app as app
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from logbook import Logger
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from litecord.enums import ChannelType, EVENTS_TO_INTENTS
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from litecord.utils import index_by_func
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from .dispatcher import DispatcherWithState, GatewayEvent
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log = Logger(__name__)
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def gdm_recipient_view(orig: dict, user_id: int) -> dict:
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"""Create a copy of the original channel object that doesn't
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show the user we are dispatching it to.
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this only applies to group dms and discords' api design that says
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a group dms' recipients must not show the original user.
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"""
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# make a copy or the original channel object
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data = dict(orig)
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idx = index_by_func(lambda user: user["id"] == str(user_id), data["recipients"])
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data["recipients"].pop(idx)
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return data
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class ChannelDispatcher(DispatcherWithState[int, str, GatewayEvent, List[str]]):
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"""Main channel Pub/Sub logic. Handles both Guild, DM, and Group DM channels."""
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async def dispatch(self, channel_id: int, event: GatewayEvent) -> List[str]:
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"""Dispatch an event to a channel."""
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session_ids = set(self.state[channel_id])
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sessions: List[str] = []
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event_type, event_data = event
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assert isinstance(event_data, dict)
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for session_id in session_ids:
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try:
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state = app.state_manager.fetch_raw(session_id)
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except KeyError:
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await self.unsub(channel_id, session_id)
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continue
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wanted_intent = EVENTS_TO_INTENTS.get(event_type)
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if wanted_intent is not None:
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state_has_intent = (state.intents & wanted_intent) == wanted_intent
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if not state_has_intent:
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continue
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correct_event = event
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# for cases where we are talking about group dms, we create an edited
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# event data so that it doesn't show the user we're dispatching
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# to in data.recipients (clients already assume they are recipients)
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if (
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event_type in ("CHANNEL_CREATE", "CHANNEL_UPDATE")
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and event_data.get("type") == ChannelType.GROUP_DM.value
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):
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new_data = gdm_recipient_view(event_data, state.user_id)
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correct_event = (event_type, new_data)
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await state.dispatch(*correct_event)
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sessions.append(session_id)
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log.info(
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"Dispatched chan={} {!r} to {} states", channel_id, event[0], len(sessions)
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)
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return sessions
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