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764f4aa2e0
For get and filter queries of NamedUserGroup, realm_for_sharding field is used instead of realm field, as directly using realm_for_sharding field on NamedUserGroup makes the query faster than using realm present on the base UserGroup table.
505 lines
19 KiB
Python
505 lines
19 KiB
Python
import functools
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import re
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from collections import defaultdict
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from dataclasses import dataclass
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from re import Match
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from typing import Literal
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from django.conf import settings
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from django.db.models import Q
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from django_stubs_ext import StrPromise
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from zerver.lib.streams import get_content_access_streams
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from zerver.lib.topic import get_latest_message_for_user_in_topic
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from zerver.lib.types import UserDisplayRecipient
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from zerver.lib.user_groups import (
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UserGroupMembershipDetails,
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get_root_id_annotated_recursive_subgroups_for_groups,
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user_has_permission_for_group_setting,
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)
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from zerver.lib.users import get_inaccessible_user_ids
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from zerver.models import NamedUserGroup, UserProfile
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from zerver.models.groups import SystemGroups
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from zerver.models.streams import Stream
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from zerver.models.users import is_cross_realm_bot_email
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BEFORE_MENTION_ALLOWED_REGEX = r"(?<![^\s\'\"\(\{\[\/<])"
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# Match multi-word string between @** ** or match any one-word
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# sequences after @
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MENTIONS_RE = re.compile(
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rf"{BEFORE_MENTION_ALLOWED_REGEX}@(?P<silent>_?)(\*\*(?P<match>[^\*]+)\*\*)"
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)
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USER_GROUP_MENTIONS_RE = re.compile(
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rf"{BEFORE_MENTION_ALLOWED_REGEX}@(?P<silent>_?)(\*(?P<match>[^\*]+)\*)"
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)
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topic_wildcards = frozenset(["topic"])
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stream_wildcards = frozenset(["all", "everyone", "stream", "channel"])
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@dataclass
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class FullNameInfo:
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id: int
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full_name: str
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is_active: bool
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@dataclass
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class UserFilter:
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id: int | None
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full_name: str | None
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def Q(self) -> Q:
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if self.full_name is not None and self.id is not None:
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return Q(full_name__iexact=self.full_name, id=self.id)
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elif self.id is not None:
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return Q(id=self.id)
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elif self.full_name is not None:
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return Q(full_name__iexact=self.full_name)
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else:
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raise AssertionError("totally empty filter makes no sense")
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@dataclass
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class MentionText:
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text: str | None
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is_topic_wildcard: bool
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is_stream_wildcard: bool
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@dataclass
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class PossibleMentions:
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mention_texts: set[str]
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message_has_topic_wildcards: bool
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message_has_stream_wildcards: bool
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@dataclass(frozen=True)
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class ChannelTopicInfo:
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channel_name: str
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topic_name: str
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@dataclass
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class ChannelInfo:
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channel_id: int
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recipient_id: int
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history_public_to_subscribers: bool
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# TODO: Track whether the current user has only metadata access or
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# content access, so that we can allow mentioning channels with
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# only metadata access, while still enforcing content access to
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# mention topics or messages within channels.
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class MentionBackend:
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# Be careful about reuse: MentionBackend contains caches which are
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# designed to only have the lifespan of a sender user (typically a
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# single request).
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#
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# In particular, user_cache is not robust to message_sender
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# within the lifetime of a single MentionBackend lifetime.
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def __init__(self, realm_id: int) -> None:
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self.realm_id = realm_id
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self.user_cache: dict[tuple[int, str], FullNameInfo] = {}
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self.stream_cache: dict[str, ChannelInfo] = {}
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self.topic_cache: dict[ChannelTopicInfo, int | None] = {}
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def get_full_name_info_list(
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self, user_filters: list[UserFilter], message_sender: UserProfile | None
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) -> list[FullNameInfo]:
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result: list[FullNameInfo] = []
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unseen_user_filters: list[UserFilter] = []
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# Try to get messages from the user_cache first.
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# This loop populates two lists:
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# - results are the objects we pull from cache
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# - unseen_user_filters are filters where need to hit the DB
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for user_filter in user_filters:
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# We expect callers who take advantage of our user_cache to supply both
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# id and full_name in the user mentions in their messages.
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if user_filter.id is not None and user_filter.full_name is not None:
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user = self.user_cache.get((user_filter.id, user_filter.full_name), None)
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if user is not None:
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result.append(user)
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continue
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# BOO! We have to go the database.
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unseen_user_filters.append(user_filter)
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# Most of the time, we have to go to the database to get user info,
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# unless our last loop found everything in the cache.
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if unseen_user_filters:
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q_list = [user_filter.Q() for user_filter in unseen_user_filters]
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rows = (
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UserProfile.objects.filter(
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Q(realm_id=self.realm_id) | Q(email__in=settings.CROSS_REALM_BOT_EMAILS),
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)
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.filter(
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functools.reduce(lambda a, b: a | b, q_list),
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)
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.only(
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"id",
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"full_name",
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"is_active",
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)
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)
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possible_mention_user_ids = [row.id for row in rows]
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inaccessible_user_ids = get_inaccessible_user_ids(
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possible_mention_user_ids, message_sender
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)
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user_list = [
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FullNameInfo(id=row.id, full_name=row.full_name, is_active=row.is_active)
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for row in rows
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if row.id not in inaccessible_user_ids
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]
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# We expect callers who take advantage of our cache to supply both
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# id and full_name in the user mentions in their messages.
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for user in user_list:
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self.user_cache[(user.id, user.full_name)] = user
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result += user_list
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return result
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def get_stream_name_map(
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self, stream_names: set[str], acting_user: UserProfile | None
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) -> dict[str, int]:
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if not stream_names:
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return {}
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result: dict[str, int] = {}
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unseen_stream_names: list[str] = []
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for stream_name in stream_names:
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if stream_name in self.stream_cache:
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result[stream_name] = self.stream_cache[stream_name].channel_id
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else:
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unseen_stream_names.append(stream_name)
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if not unseen_stream_names:
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return result
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q_list = {Q(name=name) for name in unseen_stream_names}
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if acting_user is None:
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rows = (
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Stream.objects.filter(
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realm_id=self.realm_id,
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)
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.filter(
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functools.reduce(lambda a, b: a | b, q_list),
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)
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.values(
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"id",
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"name",
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"recipient_id",
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"history_public_to_subscribers",
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)
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)
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for row in rows:
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self.stream_cache[row["name"]] = ChannelInfo(
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row["id"], row["recipient_id"], row["history_public_to_subscribers"]
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)
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result[row["name"]] = row["id"]
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else:
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content_access_streams = get_content_access_streams(
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acting_user,
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list(
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Stream.objects.filter(
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realm_id=self.realm_id,
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).filter(
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functools.reduce(lambda a, b: a | b, q_list),
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)
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),
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user_group_membership_details=UserGroupMembershipDetails(
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user_recursive_group_ids=None
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),
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)
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for stream in content_access_streams:
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assert stream.recipient_id is not None
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self.stream_cache[stream.name] = ChannelInfo(
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stream.id, stream.recipient_id, stream.history_public_to_subscribers
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)
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result[stream.name] = stream.id
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return result
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def get_topic_info_map(
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self, channel_topics: set[ChannelTopicInfo], acting_user: UserProfile | None
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) -> dict[ChannelTopicInfo, int | None]:
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if not channel_topics:
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return {}
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result: dict[ChannelTopicInfo, int | None] = {}
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unseen_channel_topic: list[ChannelTopicInfo] = []
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for channel_topic in channel_topics:
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if channel_topic in self.topic_cache:
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result[channel_topic] = self.topic_cache[channel_topic]
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else:
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unseen_channel_topic.append(channel_topic)
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for channel_topic in unseen_channel_topic:
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channel_info = self.stream_cache.get(channel_topic.channel_name)
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if channel_info is None:
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# The acting user does not have access to content in this channel.
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continue
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recipient_id = channel_info.recipient_id
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topic_name = channel_topic.topic_name
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history_public_to_subscribers = channel_info.history_public_to_subscribers
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# Any message in the topic is a valid choice for the
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# /with/ anchor. There are two risks to manage here:
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# - The target message could be deleted or be a mispost that
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# is off-topic and moved shortly.
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# - The topic could be split into two topics.
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#
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# Originally, we picked the oldest message because that
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# message is least likely to be deleted/moved for being a
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# mispost/error -- i.e., trying to do a bit better in rare
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# corner cases. We switched to preferring the latest
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# message in API feature level 400. The "latest" algorithm
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# is better when linking to an active conversation in a
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# long topic that's a follow-up/tangent and ends up being
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# moved/split, which users do constantly.
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topic_latest_message = get_latest_message_for_user_in_topic(
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self.realm_id,
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acting_user,
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recipient_id,
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topic_name,
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history_public_to_subscribers,
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acting_user_has_channel_content_access=True,
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)
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self.topic_cache[channel_topic] = topic_latest_message
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result[channel_topic] = topic_latest_message
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return result
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def user_mention_matches_topic_wildcard(mention: str) -> bool:
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return mention in topic_wildcards
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def user_mention_matches_stream_wildcard(mention: str) -> bool:
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return mention in stream_wildcards
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def extract_mention_text(m: Match[str]) -> MentionText:
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text = m.group("match")
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if text in topic_wildcards:
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return MentionText(text=None, is_topic_wildcard=True, is_stream_wildcard=False)
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if text in stream_wildcards:
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return MentionText(text=None, is_topic_wildcard=False, is_stream_wildcard=True)
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return MentionText(text=text, is_topic_wildcard=False, is_stream_wildcard=False)
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def possible_mentions(content: str) -> PossibleMentions:
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# mention texts can either be names, or an extended name|id syntax.
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texts = set()
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message_has_topic_wildcards = False
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message_has_stream_wildcards = False
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for m in MENTIONS_RE.finditer(content):
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mention_text = extract_mention_text(m)
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text = mention_text.text
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if text:
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texts.add(text)
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if mention_text.is_topic_wildcard:
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message_has_topic_wildcards = True
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if mention_text.is_stream_wildcard:
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message_has_stream_wildcards = True
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return PossibleMentions(
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mention_texts=texts,
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message_has_topic_wildcards=message_has_topic_wildcards,
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message_has_stream_wildcards=message_has_stream_wildcards,
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)
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def possible_user_group_mentions(content: str) -> dict[str, Literal["silent", "non-silent"]]:
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# maps each group name to its mention type, silent or non-silent.
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mentions: dict[str, Literal["silent", "non-silent"]] = {}
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for mention in USER_GROUP_MENTIONS_RE.finditer(content):
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group_mention = mention.group("match")
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# non-silent mention can override silent.
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if not mention.group("silent"):
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mentions[group_mention] = "non-silent"
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# silent mention should NOT override non-silent.
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if mention.group("silent") and group_mention not in mentions:
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mentions[group_mention] = "silent"
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return mentions
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def get_possible_mentions_info(
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mention_backend: MentionBackend, mention_texts: set[str], message_sender: UserProfile | None
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) -> list[FullNameInfo]:
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if not mention_texts:
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return []
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user_filters = list()
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name_re = r"(?P<full_name>.+)?\|(?P<mention_id>\d+)$"
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for mention_text in mention_texts:
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name_syntax_match = re.match(name_re, mention_text)
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if name_syntax_match:
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full_name = name_syntax_match.group("full_name")
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mention_id = name_syntax_match.group("mention_id")
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if full_name:
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# For **name|id** mentions as mention_id
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# cannot be null inside this block.
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user_filters.append(UserFilter(full_name=full_name, id=int(mention_id)))
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else:
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# For **|id** syntax.
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user_filters.append(UserFilter(full_name=None, id=int(mention_id)))
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else:
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# For **name** syntax.
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user_filters.append(UserFilter(full_name=mention_text, id=None))
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return mention_backend.get_full_name_info_list(user_filters, message_sender)
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class MentionData:
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def __init__(
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self, mention_backend: MentionBackend, content: str, message_sender: UserProfile | None
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) -> None:
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self.mention_backend = mention_backend
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realm_id = mention_backend.realm_id
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self.message_sender = message_sender
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mentions = possible_mentions(content)
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possible_mentions_info = get_possible_mentions_info(
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mention_backend, mentions.mention_texts, message_sender
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)
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self.full_name_info = {row.full_name.lower(): row for row in possible_mentions_info}
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self.user_id_info = {row.id: row for row in possible_mentions_info}
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self.init_user_group_data(realm_id=realm_id, content=content)
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self.has_stream_wildcards = mentions.message_has_stream_wildcards
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self.has_topic_wildcards = mentions.message_has_topic_wildcards
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def message_has_stream_wildcards(self) -> bool:
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return self.has_stream_wildcards
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def message_has_topic_wildcards(self) -> bool:
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return self.has_topic_wildcards
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def init_user_group_data(self, realm_id: int, content: str) -> None:
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self.user_group_name_info: dict[str, NamedUserGroup] = {}
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self.user_group_members: dict[int, set[int]] = defaultdict(set)
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user_group_names_mentions = possible_user_group_mentions(content)
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if user_group_names_mentions:
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named_user_groups = NamedUserGroup.objects.filter(
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realm_for_sharding_id=realm_id, name__in=user_group_names_mentions
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)
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# No filter here as we need user_group_name_info for all groups mentions.
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self.user_group_name_info = {group.name.lower(): group for group in named_user_groups}
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# We only fetch group membership mentions that can
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# possibly trigger notifications.
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filtered_group_ids = [
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group.id
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for group in named_user_groups
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if not group.deactivated
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and user_group_names_mentions.get(group.name) == "non-silent"
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]
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# Avoid doing a database query if there's nothing to fetch.
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#
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# This isn't quite optimal -- we've not checked our user
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# has permission to mention the group yet.
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if len(filtered_group_ids) == 0:
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return
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# Fetch membership for the groups filtered above in a
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# single, efficient bulk query, mapping each group to its
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# direct and indirect members.
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for group_root_id, member_id in (
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get_root_id_annotated_recursive_subgroups_for_groups(filtered_group_ids, realm_id)
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.filter(direct_members__is_active=True)
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.values_list("root_id", "direct_members") # type: ignore[misc] # root_id is an annotated field.
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):
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self.user_group_members[group_root_id].add(member_id)
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def get_user_by_name(self, name: str) -> FullNameInfo | None:
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# warning: get_user_by_name is not dependable if two
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# users of the same full name are mentioned. Use
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# get_user_by_id where possible.
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return self.full_name_info.get(name.lower(), None)
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def get_user_by_id(self, id: int) -> FullNameInfo | None:
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return self.user_id_info.get(id, None)
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def get_user_ids(self) -> set[int]:
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"""
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Returns the user IDs that might have been mentioned by this
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content. Note that because this data structure has not parsed
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the message and does not know about escaping/code blocks, this
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will overestimate the list of user ids.
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"""
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return set(self.user_id_info.keys())
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def get_user_group(self, name: str) -> NamedUserGroup | None:
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return self.user_group_name_info.get(name.lower(), None)
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def get_group_members(self, user_group_id: int) -> set[int]:
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return self.user_group_members.get(user_group_id, set())
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def get_stream_name_map(
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self, stream_names: set[str], acting_user: UserProfile | None
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) -> dict[str, int]:
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return self.mention_backend.get_stream_name_map(stream_names, acting_user=acting_user)
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def get_topic_info_map(
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self, channel_topics: set[ChannelTopicInfo], acting_user: UserProfile | None
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) -> dict[ChannelTopicInfo, int | None]:
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return self.mention_backend.get_topic_info_map(channel_topics, acting_user=acting_user)
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def silent_mention_syntax_for_user(user_profile: UserProfile | UserDisplayRecipient) -> str:
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if isinstance(user_profile, UserProfile):
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return f"@_**{user_profile.full_name}|{user_profile.id}**"
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else:
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return f"@_**{user_profile['full_name']}|{user_profile['id']}**"
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def silent_mention_syntax_for_user_group(user_group: NamedUserGroup) -> str:
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return f"@_*{user_group.name}*"
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|
|
|
|
def get_user_group_mention_display_name(user_group: NamedUserGroup) -> StrPromise | str:
|
|
if user_group.is_system_group:
|
|
return SystemGroups.GROUP_DISPLAY_NAME_MAP[user_group.name]
|
|
|
|
return user_group.name
|
|
|
|
|
|
def sender_can_mention_group(sender: UserProfile | None, named_group: NamedUserGroup) -> bool:
|
|
can_mention_group = named_group.can_mention_group
|
|
|
|
if (
|
|
hasattr(can_mention_group, "named_user_group")
|
|
and can_mention_group.named_user_group.name == SystemGroups.EVERYONE
|
|
):
|
|
return True
|
|
|
|
assert sender is not None
|
|
|
|
if is_cross_realm_bot_email(sender.delivery_email):
|
|
return False
|
|
|
|
return user_has_permission_for_group_setting(
|
|
can_mention_group.id,
|
|
sender,
|
|
NamedUserGroup.GROUP_PERMISSION_SETTINGS["can_mention_group"],
|
|
direct_member_only=False,
|
|
)
|