159 lines
5.3 KiB
Python
159 lines
5.3 KiB
Python
"""
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Утилиты для модуля communications.
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Переиспользуемые функции для API, WebSocket и других компонентов.
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"""
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from __future__ import annotations
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import datetime
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from datetime import datetime as dt
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from datetime import timezone as dt_tz
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from django.utils import timezone
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from django.utils.dateparse import parse_datetime
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from .models import Chat, ChatMembership
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def _coerce_ts(val: str | None) -> datetime.datetime:
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"""
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Принимает миллисекунды/секунды с эпохи или ISO-дату.
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Возвращает aware-дату (UTC). Фоллбек — timezone.now().
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Args:
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val: Строка с timestamp (ms/sec) или ISO-дата
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Returns:
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datetime: Aware datetime объект в UTC
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Examples:
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>>> _coerce_ts("1640000000000") # миллисекунды
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datetime.datetime(2021, 12, 20, 13, 33, 20, tzinfo=UTC)
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>>> _coerce_ts("1640000000") # секунды
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datetime.datetime(2021, 12, 20, 13, 33, 20, tzinfo=UTC)
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>>> _coerce_ts("2021-12-20T13:33:20Z") # ISO
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datetime.datetime(2021, 12, 20, 13, 33, 20, tzinfo=UTC)
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"""
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if not val:
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return timezone.now()
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# Сначала пробуем число (sec/ms)
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try:
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iv = int(val)
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if iv > 10**12: # пришли миллисекунды
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iv //= 1000
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return dt.fromtimestamp(iv, tz=dt_tz.utc)
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except Exception:
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pass
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# Потом пробуем ISO-строку
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d = parse_datetime(val)
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if d is None:
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return timezone.now()
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if timezone.is_naive(d):
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return timezone.make_aware(d, timezone=timezone.get_current_timezone())
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return d
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def user_can_access_chat(chat: Chat, user) -> bool:
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"""
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Проверяет, имеет ли пользователь доступ к чату.
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Правила доступа по типам чатов:
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- global: доступ всем
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- private: активное ChatMembership
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- group: активное ChatMembership (или context-based resolver)
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- channel/announcement: include_all_users или активное ChatMembership
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- comments: context-based доступ через get_participants()
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Args:
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chat: Объект Chat
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user: Объект User
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Returns:
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bool: True если пользователь имеет доступ
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Note:
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Использует прямые запросы к БД в обход prefetch cache
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"""
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if not chat or not user:
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return False
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if chat.type == "global":
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return True
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def _has_direct_participation() -> bool:
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return chat.participants.filter(pk=user.pk).exists()
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if chat.type == "private":
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return (
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ChatMembership.objects.filter(chat=chat, user=user, is_active=True).exists()
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or _has_direct_participation()
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)
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if chat.type == "group":
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# Групповые чаты с контекстным объектом используют resolver
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if chat.context_object_id:
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try:
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participants = chat.get_participants()
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return participants.filter(pk=user.pk).exists()
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except Exception as e:
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import logging
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logger = logging.getLogger(__name__)
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logger.warning(
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"Chat access participant resolution failed",
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extra={
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"event": "chat.access.participant_resolution_failed",
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"chat_id": chat.id,
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"user_id": user.id,
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"chat_type": chat.type,
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"error_type": type(e).__name__,
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},
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exc_info=True,
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)
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return (
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ChatMembership.objects.filter(chat=chat, user=user, is_active=True).exists()
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or _has_direct_participation()
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)
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if chat.type in ("channel", "announcement"):
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if chat.include_all_users:
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return user.is_active
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return (
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ChatMembership.objects.filter(chat=chat, user=user, is_active=True).exists()
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or _has_direct_participation()
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)
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if chat.type == "comments":
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# Чаты-комментарии используют context-based доступ через
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# get_participants()
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if chat.context_object_id:
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try:
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participants = chat.get_participants()
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return participants.filter(pk=user.pk).exists()
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except Exception as e:
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import logging
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logger = logging.getLogger(__name__)
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logger.warning(
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"Comments chat access participant resolution failed",
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extra={
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"event": "chat.access.participant_resolution_failed",
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"chat_id": chat.id,
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"user_id": user.id,
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"chat_type": chat.type,
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"error_type": type(e).__name__,
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},
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exc_info=True,
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)
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return False
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return (
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ChatMembership.objects.filter(chat=chat, user=user, is_active=True).exists()
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or _has_direct_participation()
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)
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return False
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