import copy import datetime import zlib from dataclasses import dataclass, field from typing import Any, Dict, List, Mapping, Optional, Sequence, Set, Tuple, Union import ahocorasick import orjson from django.conf import settings from django.db import connection from django.db.models import Max, Sum from django.utils.timezone import now as timezone_now from django.utils.translation import gettext as _ from psycopg2.sql import SQL from typing_extensions import TypedDict from analytics.lib.counts import COUNT_STATS from analytics.models import RealmCount from zerver.lib.avatar import get_avatar_field from zerver.lib.cache import ( cache_with_key, generic_bulk_cached_fetch, to_dict_cache_key, to_dict_cache_key_id, ) from zerver.lib.display_recipient import bulk_fetch_display_recipients from zerver.lib.exceptions import JsonableError, MissingAuthenticationError from zerver.lib.markdown import MessageRenderingResult, markdown_convert, topic_links from zerver.lib.markdown import version as markdown_version from zerver.lib.mention import MentionData from zerver.lib.request import RequestVariableConversionError from zerver.lib.stream_subscription import ( get_stream_subscriptions_for_user, get_subscribed_stream_recipient_ids_for_user, num_subscribers_for_stream_id, ) from zerver.lib.streams import get_web_public_streams_queryset from zerver.lib.timestamp import datetime_to_timestamp from zerver.lib.topic import DB_TOPIC_NAME, MESSAGE__TOPIC, TOPIC_LINKS, TOPIC_NAME from zerver.lib.topic_mutes import build_topic_mute_checker, topic_is_muted from zerver.lib.types import DisplayRecipientT, UserDisplayRecipient from zerver.models import ( MAX_TOPIC_NAME_LENGTH, Message, Reaction, Realm, Recipient, Stream, SubMessage, Subscription, UserMessage, UserProfile, get_display_recipient_by_id, get_usermessage_by_message_id, query_for_ids, ) class RawReactionRow(TypedDict): emoji_code: str emoji_name: str message_id: int reaction_type: str user_profile__email: str user_profile__full_name: str user_profile_id: int class RawUnreadStreamDict(TypedDict): stream_id: int topic: str class RawUnreadPrivateMessageDict(TypedDict): sender_id: int class RawUnreadHuddleDict(TypedDict): user_ids_string: str class RawUnreadMessagesResult(TypedDict): pm_dict: Dict[int, RawUnreadPrivateMessageDict] stream_dict: Dict[int, RawUnreadStreamDict] huddle_dict: Dict[int, RawUnreadHuddleDict] mentions: Set[int] muted_stream_ids: List[int] unmuted_stream_msgs: Set[int] old_unreads_missing: bool class UnreadMessagesResult(TypedDict): pms: List[Dict[str, Any]] streams: List[Dict[str, Any]] huddles: List[Dict[str, Any]] mentions: List[int] count: int old_unreads_missing: bool @dataclass class SendMessageRequest: message: Message rendering_result: MessageRenderingResult stream: Optional[Stream] local_id: Optional[str] sender_queue_id: Optional[str] realm: Realm mention_data: MentionData mentioned_user_groups_map: Dict[int, int] active_user_ids: Set[int] online_push_user_ids: Set[int] pm_mention_push_disabled_user_ids: Set[int] pm_mention_email_disabled_user_ids: Set[int] stream_push_user_ids: Set[int] stream_email_user_ids: Set[int] muted_sender_user_ids: Set[int] um_eligible_user_ids: Set[int] long_term_idle_user_ids: Set[int] default_bot_user_ids: Set[int] service_bot_tuples: List[Tuple[int, int]] all_bot_user_ids: Set[int] wildcard_mention_user_ids: Set[int] links_for_embed: Set[str] widget_content: Optional[Dict[str, Any]] submessages: List[Dict[str, Any]] = field(default_factory=list) deliver_at: Optional[datetime.datetime] = None delivery_type: Optional[str] = None # We won't try to fetch more unread message IDs from the database than # this limit. The limit is super high, in large part because it means # client-side code mostly doesn't need to think about the case that a # user has more older unread messages that were cut off. MAX_UNREAD_MESSAGES = 50000 def truncate_content(content: str, max_length: int, truncation_message: str) -> str: if len(content) > max_length: content = content[: max_length - len(truncation_message)] + truncation_message return content def normalize_body(body: str) -> str: body = body.rstrip().lstrip("\n") if len(body) == 0: raise JsonableError(_("Message must not be empty")) if "\x00" in body: raise JsonableError(_("Message must not contain null bytes")) return truncate_content(body, settings.MAX_MESSAGE_LENGTH, "\n[message truncated]") def truncate_topic(topic: str) -> str: return truncate_content(topic, MAX_TOPIC_NAME_LENGTH, "...") def messages_for_ids( message_ids: List[int], user_message_flags: Dict[int, List[str]], search_fields: Dict[int, Dict[str, str]], apply_markdown: bool, client_gravatar: bool, allow_edit_history: bool, ) -> List[Dict[str, Any]]: cache_transformer = MessageDict.build_dict_from_raw_db_row id_fetcher = lambda row: row["id"] message_dicts = generic_bulk_cached_fetch( to_dict_cache_key_id, MessageDict.get_raw_db_rows, message_ids, id_fetcher=id_fetcher, cache_transformer=cache_transformer, extractor=extract_message_dict, setter=stringify_message_dict, ) message_list: List[Dict[str, Any]] = [] for message_id in message_ids: msg_dict = message_dicts[message_id] msg_dict.update(flags=user_message_flags[message_id]) if message_id in search_fields: msg_dict.update(search_fields[message_id]) # Make sure that we never send message edit history to clients # in realms with allow_edit_history disabled. if "edit_history" in msg_dict and not allow_edit_history: del msg_dict["edit_history"] message_list.append(msg_dict) MessageDict.post_process_dicts(message_list, apply_markdown, client_gravatar) return message_list def sew_messages_and_reactions( messages: List[Dict[str, Any]], reactions: List[Dict[str, Any]] ) -> List[Dict[str, Any]]: """Given a iterable of messages and reactions stitch reactions into messages. """ # Add all messages with empty reaction item for message in messages: message["reactions"] = [] # Convert list of messages into dictionary to make reaction stitching easy converted_messages = {message["id"]: message for message in messages} for reaction in reactions: converted_messages[reaction["message_id"]]["reactions"].append(reaction) return list(converted_messages.values()) def sew_messages_and_submessages( messages: List[Dict[str, Any]], submessages: List[Dict[str, Any]] ) -> None: # This is super similar to sew_messages_and_reactions. for message in messages: message["submessages"] = [] message_dict = {message["id"]: message for message in messages} for submessage in submessages: message_id = submessage["message_id"] if message_id in message_dict: message = message_dict[message_id] message["submessages"].append(submessage) def extract_message_dict(message_bytes: bytes) -> Dict[str, Any]: return orjson.loads(zlib.decompress(message_bytes)) def stringify_message_dict(message_dict: Dict[str, Any]) -> bytes: return zlib.compress(orjson.dumps(message_dict)) @cache_with_key(to_dict_cache_key, timeout=3600 * 24) def message_to_dict_json(message: Message, realm_id: Optional[int] = None) -> bytes: return MessageDict.to_dict_uncached([message], realm_id)[message.id] def save_message_rendered_content(message: Message, content: str) -> str: rendering_result = render_markdown(message, content, realm=message.get_realm()) rendered_content = None if rendering_result is not None: rendered_content = rendering_result.rendered_content message.rendered_content = rendered_content message.rendered_content_version = markdown_version message.save_rendered_content() return rendered_content class MessageDict: """MessageDict is the core class responsible for marshalling Message objects obtained from the database into a format that can be sent to clients via the Zulip API, whether via `GET /messages`, outgoing webhooks, or other code paths. There are two core flows through which this class is used: * For just-sent messages, we construct a single `wide_dict` object containing all the data for the message and the related UserProfile models (sender_info and recipient_info); this object can be stored in queues, caches, etc., and then later turned into an API-format JSONable dictionary via finalize_payload. * When fetching messages from the database, we fetch their data in bulk using messages_for_ids, which makes use of caching, bulk fetches that skip the Django ORM, etc., to provide an optimized interface for fetching hundreds of thousands of messages from the database and then turning them into API-format JSON dictionaries. """ @staticmethod def wide_dict(message: Message, realm_id: Optional[int] = None) -> Dict[str, Any]: """ The next two lines get the cacheable field related to our message object, with the side effect of populating the cache. """ json = message_to_dict_json(message, realm_id) obj = extract_message_dict(json) """ The steps below are similar to what we do in post_process_dicts(), except we don't call finalize_payload(), since that step happens later in the queue processor. """ MessageDict.bulk_hydrate_sender_info([obj]) MessageDict.bulk_hydrate_recipient_info([obj]) return obj @staticmethod def post_process_dicts( objs: List[Dict[str, Any]], apply_markdown: bool, client_gravatar: bool ) -> None: """ NOTE: This function mutates the objects in the `objs` list, rather than making shallow copies. It might be safer to make shallow copies here, but performance is somewhat important here, as we are often fetching hundreds of messages. """ MessageDict.bulk_hydrate_sender_info(objs) MessageDict.bulk_hydrate_recipient_info(objs) for obj in objs: MessageDict.finalize_payload(obj, apply_markdown, client_gravatar, skip_copy=True) @staticmethod def finalize_payload( obj: Dict[str, Any], apply_markdown: bool, client_gravatar: bool, keep_rendered_content: bool = False, skip_copy: bool = False, ) -> Dict[str, Any]: """ By default, we make a shallow copy of the incoming dict to avoid mutation-related bugs. Code paths that are passing a unique object can pass skip_copy=True to avoid this extra work. """ if not skip_copy: obj = copy.copy(obj) MessageDict.set_sender_avatar(obj, client_gravatar) if apply_markdown: obj["content_type"] = "text/html" obj["content"] = obj["rendered_content"] else: obj["content_type"] = "text/x-markdown" if not keep_rendered_content: del obj["rendered_content"] del obj["sender_realm_id"] del obj["sender_avatar_source"] del obj["sender_delivery_email"] del obj["sender_avatar_version"] del obj["recipient_type"] del obj["recipient_type_id"] del obj["sender_is_mirror_dummy"] return obj @staticmethod def sew_submessages_and_reactions_to_msgs( messages: List[Dict[str, Any]] ) -> List[Dict[str, Any]]: msg_ids = [msg["id"] for msg in messages] submessages = SubMessage.get_raw_db_rows(msg_ids) sew_messages_and_submessages(messages, submessages) reactions = Reaction.get_raw_db_rows(msg_ids) return sew_messages_and_reactions(messages, reactions) @staticmethod def to_dict_uncached( messages: List[Message], realm_id: Optional[int] = None ) -> Dict[int, bytes]: messages_dict = MessageDict.to_dict_uncached_helper(messages, realm_id) encoded_messages = {msg["id"]: stringify_message_dict(msg) for msg in messages_dict} return encoded_messages @staticmethod def to_dict_uncached_helper( messages: List[Message], realm_id: Optional[int] = None ) -> List[Dict[str, Any]]: # Near duplicate of the build_message_dict + get_raw_db_rows # code path that accepts already fetched Message objects # rather than message IDs. def get_rendering_realm_id(message: Message) -> int: # realm_id can differ among users, currently only possible # with cross realm bots. if realm_id is not None: return realm_id if message.recipient.type == Recipient.STREAM: return Stream.objects.get(id=message.recipient.type_id).realm_id return message.sender.realm_id message_rows = [ { "id": message.id, DB_TOPIC_NAME: message.topic_name(), "date_sent": message.date_sent, "last_edit_time": message.last_edit_time, "edit_history": message.edit_history, "content": message.content, "rendered_content": message.rendered_content, "rendered_content_version": message.rendered_content_version, "recipient_id": message.recipient.id, "recipient__type": message.recipient.type, "recipient__type_id": message.recipient.type_id, "rendering_realm_id": get_rendering_realm_id(message), "sender_id": message.sender.id, "sending_client__name": message.sending_client.name, "sender__realm_id": message.sender.realm_id, } for message in messages ] MessageDict.sew_submessages_and_reactions_to_msgs(message_rows) return [MessageDict.build_dict_from_raw_db_row(row) for row in message_rows] @staticmethod def get_raw_db_rows(needed_ids: List[int]) -> List[Dict[str, Any]]: # This is a special purpose function optimized for # callers like get_messages_backend(). fields = [ "id", DB_TOPIC_NAME, "date_sent", "last_edit_time", "edit_history", "content", "rendered_content", "rendered_content_version", "recipient_id", "recipient__type", "recipient__type_id", "sender_id", "sending_client__name", "sender__realm_id", ] messages = Message.objects.filter(id__in=needed_ids).values(*fields) return MessageDict.sew_submessages_and_reactions_to_msgs(messages) @staticmethod def build_dict_from_raw_db_row(row: Dict[str, Any]) -> Dict[str, Any]: """ row is a row from a .values() call, and it needs to have all the relevant fields populated """ return MessageDict.build_message_dict( message_id=row["id"], last_edit_time=row["last_edit_time"], edit_history=row["edit_history"], content=row["content"], topic_name=row[DB_TOPIC_NAME], date_sent=row["date_sent"], rendered_content=row["rendered_content"], rendered_content_version=row["rendered_content_version"], sender_id=row["sender_id"], sender_realm_id=row["sender__realm_id"], sending_client_name=row["sending_client__name"], rendering_realm_id=row.get("rendering_realm_id", row["sender__realm_id"]), recipient_id=row["recipient_id"], recipient_type=row["recipient__type"], recipient_type_id=row["recipient__type_id"], reactions=row["reactions"], submessages=row["submessages"], ) @staticmethod def build_message_dict( message_id: int, last_edit_time: Optional[datetime.datetime], edit_history: Optional[str], content: str, topic_name: str, date_sent: datetime.datetime, rendered_content: Optional[str], rendered_content_version: Optional[int], sender_id: int, sender_realm_id: int, sending_client_name: str, rendering_realm_id: int, recipient_id: int, recipient_type: int, recipient_type_id: int, reactions: List[RawReactionRow], submessages: List[Dict[str, Any]], ) -> Dict[str, Any]: obj = dict( id=message_id, sender_id=sender_id, content=content, recipient_type_id=recipient_type_id, recipient_type=recipient_type, recipient_id=recipient_id, timestamp=datetime_to_timestamp(date_sent), client=sending_client_name, ) obj[TOPIC_NAME] = topic_name obj["sender_realm_id"] = sender_realm_id # Render topic_links with the stream's realm instead of the # sender's realm; this is important for messages sent by # cross-realm bots like NOTIFICATION_BOT. obj[TOPIC_LINKS] = topic_links(rendering_realm_id, topic_name) if last_edit_time is not None: obj["last_edit_timestamp"] = datetime_to_timestamp(last_edit_time) assert edit_history is not None obj["edit_history"] = orjson.loads(edit_history) if Message.need_to_render_content( rendered_content, rendered_content_version, markdown_version ): # We really shouldn't be rendering objects in this method, but there is # a scenario where we upgrade the version of Markdown and fail to run # management commands to re-render historical messages, and then we # need to have side effects. This method is optimized to not need full # blown ORM objects, but the Markdown renderer is unfortunately highly # coupled to Message, and we also need to persist the new rendered content. # If we don't have a message object passed in, we get one here. The cost # of going to the DB here should be overshadowed by the cost of rendering # and updating the row. # TODO: see #1379 to eliminate Markdown dependencies message = Message.objects.select_related().get(id=message_id) assert message is not None # Hint for mypy. # It's unfortunate that we need to have side effects on the message # in some cases. rendered_content = save_message_rendered_content(message, content) if rendered_content is not None: obj["rendered_content"] = rendered_content else: obj["rendered_content"] = ( "

[Zulip note: Sorry, we could not " + "understand the formatting of your message]

" ) if rendered_content is not None: obj["is_me_message"] = Message.is_status_message(content, rendered_content) else: obj["is_me_message"] = False obj["reactions"] = [ ReactionDict.build_dict_from_raw_db_row(reaction) for reaction in reactions ] obj["submessages"] = submessages return obj @staticmethod def bulk_hydrate_sender_info(objs: List[Dict[str, Any]]) -> None: sender_ids = list({obj["sender_id"] for obj in objs}) if not sender_ids: return query = UserProfile.objects.values( "id", "full_name", "delivery_email", "email", "realm__string_id", "avatar_source", "avatar_version", "is_mirror_dummy", ) rows = query_for_ids(query, sender_ids, "zerver_userprofile.id") sender_dict = {row["id"]: row for row in rows} for obj in objs: sender_id = obj["sender_id"] user_row = sender_dict[sender_id] obj["sender_full_name"] = user_row["full_name"] obj["sender_email"] = user_row["email"] obj["sender_delivery_email"] = user_row["delivery_email"] obj["sender_realm_str"] = user_row["realm__string_id"] obj["sender_avatar_source"] = user_row["avatar_source"] obj["sender_avatar_version"] = user_row["avatar_version"] obj["sender_is_mirror_dummy"] = user_row["is_mirror_dummy"] @staticmethod def hydrate_recipient_info(obj: Dict[str, Any], display_recipient: DisplayRecipientT) -> None: """ This method hyrdrates recipient info with things like full names and emails of senders. Eventually our clients should be able to hyrdrate these fields themselves with info they already have on users. """ recipient_type = obj["recipient_type"] recipient_type_id = obj["recipient_type_id"] sender_is_mirror_dummy = obj["sender_is_mirror_dummy"] sender_email = obj["sender_email"] sender_full_name = obj["sender_full_name"] sender_id = obj["sender_id"] if recipient_type == Recipient.STREAM: display_type = "stream" elif recipient_type in (Recipient.HUDDLE, Recipient.PERSONAL): assert not isinstance(display_recipient, str) display_type = "private" if len(display_recipient) == 1: # add the sender in if this isn't a message between # someone and themself, preserving ordering recip: UserDisplayRecipient = { "email": sender_email, "full_name": sender_full_name, "id": sender_id, "is_mirror_dummy": sender_is_mirror_dummy, } if recip["email"] < display_recipient[0]["email"]: display_recipient = [recip, display_recipient[0]] elif recip["email"] > display_recipient[0]["email"]: display_recipient = [display_recipient[0], recip] else: raise AssertionError(f"Invalid recipient type {recipient_type}") obj["display_recipient"] = display_recipient obj["type"] = display_type if obj["type"] == "stream": obj["stream_id"] = recipient_type_id @staticmethod def bulk_hydrate_recipient_info(objs: List[Dict[str, Any]]) -> None: recipient_tuples = { # We use set to eliminate duplicate tuples. ( obj["recipient_id"], obj["recipient_type"], obj["recipient_type_id"], ) for obj in objs } display_recipients = bulk_fetch_display_recipients(recipient_tuples) for obj in objs: MessageDict.hydrate_recipient_info(obj, display_recipients[obj["recipient_id"]]) @staticmethod def set_sender_avatar(obj: Dict[str, Any], client_gravatar: bool) -> None: sender_id = obj["sender_id"] sender_realm_id = obj["sender_realm_id"] sender_delivery_email = obj["sender_delivery_email"] sender_avatar_source = obj["sender_avatar_source"] sender_avatar_version = obj["sender_avatar_version"] obj["avatar_url"] = get_avatar_field( user_id=sender_id, realm_id=sender_realm_id, email=sender_delivery_email, avatar_source=sender_avatar_source, avatar_version=sender_avatar_version, medium=False, client_gravatar=client_gravatar, ) class ReactionDict: @staticmethod def build_dict_from_raw_db_row(row: RawReactionRow) -> Dict[str, Any]: return { "emoji_name": row["emoji_name"], "emoji_code": row["emoji_code"], "reaction_type": row["reaction_type"], # TODO: We plan to remove this redundant user dictionary once # clients are updated to support accessing use user_id. See # https://github.com/zulip/zulip/pull/14711 for details. # # When we do that, we can likely update the `.values()` query to # not fetch the extra user_profile__* fields from the database # as a small performance optimization. "user": { "email": row["user_profile__email"], "id": row["user_profile_id"], "full_name": row["user_profile__full_name"], }, "user_id": row["user_profile_id"], } def access_message( user_profile: UserProfile, message_id: int, lock_message: bool = False, ) -> Tuple[Message, Optional[UserMessage]]: """You can access a message by ID in our APIs that either: (1) You received or have previously accessed via starring (aka have a UserMessage row for). (2) Was sent to a public stream in your realm. We produce consistent, boring error messages to avoid leaking any information from a security perspective. The lock_message parameter should be passed by callers that are planning to modify the Message object. This will use the SQL `SELECT FOR UPDATE` feature to ensure that other processes cannot delete the message during the current transaction, which is important to prevent rare race conditions. Callers must only pass lock_message when inside a @transaction.atomic block. """ try: base_query = Message.objects.select_related() if lock_message: # We want to lock only the `Message` row, and not the related fields # because the `Message` row only has a possibility of races. base_query = base_query.select_for_update(of=("self",)) message = base_query.get(id=message_id) except Message.DoesNotExist: raise JsonableError(_("Invalid message(s)")) user_message = get_usermessage_by_message_id(user_profile, message_id) if has_message_access(user_profile, message, has_user_message=user_message is not None): return (message, user_message) raise JsonableError(_("Invalid message(s)")) def access_web_public_message( realm: Realm, message_id: int, ) -> Message: """Access control method for unauthenticated requests interacting with a message in web-public streams. """ # We throw a MissingAuthenticationError for all errors in this # code path, to avoid potentially leaking information on whether a # message with the provided ID exists on the server if the client # shouldn't have access to it. if not realm.web_public_streams_enabled(): raise MissingAuthenticationError() try: message = Message.objects.select_related().get(id=message_id) except Message.DoesNotExist: raise MissingAuthenticationError() if not message.is_stream_message(): raise MissingAuthenticationError() queryset = get_web_public_streams_queryset(realm) try: stream = queryset.get(id=message.recipient.type_id) except Stream.DoesNotExist: raise MissingAuthenticationError() # These should all have been enforced by the code in # get_web_public_streams_queryset assert stream.is_web_public assert not stream.deactivated assert not stream.invite_only assert stream.history_public_to_subscribers # Now that we've confirmed this message was sent to the target # web-public stream, we can return it as having been successfully # accessed. return message def has_message_access( user_profile: UserProfile, message: Message, *, has_user_message: bool, stream: Optional[Stream] = None, is_subscribed: Optional[bool] = None, ) -> bool: """ Returns whether a user has access to a given message. * The user_message parameter must be provided if the user has a UserMessage row for the target message. * The optional stream parameter is validated; is_subscribed is not. """ # If you have a user_message object, you have access. if has_user_message: return True if message.recipient.type != Recipient.STREAM: # You can't access private messages you didn't receive return False if stream is None: stream = Stream.objects.get(id=message.recipient.type_id) else: assert stream.recipient_id == message.recipient_id if stream.realm != user_profile.realm: # You can't access public stream messages in other realms return False if not stream.is_history_public_to_subscribers(): # You can't access messages you didn't directly receive # unless history is public to subscribers. return False if stream.is_public() and user_profile.can_access_public_streams(): return True # is_history_public_to_subscribers, so check if you're subscribed if is_subscribed is not None: return is_subscribed return Subscription.objects.filter( user_profile=user_profile, active=True, recipient=message.recipient ).exists() def bulk_access_messages( user_profile: UserProfile, messages: Sequence[Message], *, stream: Optional[Stream] = None ) -> List[Message]: """This function does the full has_message_access check for each message. If stream is provided, it is used to avoid unnecessary database queries, and will use exactly 2 bulk queries instead. Throws AssertionError if stream is passed and any of the messages were not sent to that stream. """ filtered_messages = [] user_message_set = set( bulk_access_messages_expect_usermessage( user_profile.id, [message.id for message in messages] ) ) # TODO: Ideally, we'd do a similar bulk-stream-fetch if stream is # None, so that this function is fast with subscribed_recipient_ids = set(get_subscribed_stream_recipient_ids_for_user(user_profile)) for message in messages: has_user_message = message.id in user_message_set is_subscribed = message.recipient_id in subscribed_recipient_ids if has_message_access( user_profile, message, has_user_message=has_user_message, stream=stream, is_subscribed=is_subscribed, ): filtered_messages.append(message) return filtered_messages def bulk_access_messages_expect_usermessage( user_profile_id: int, message_ids: Sequence[int] ) -> List[int]: """ Like bulk_access_messages, but faster and potentially stricter. Returns a subset of `message_ids` containing only messages the user can access. Makes O(1) database queries. Use this function only when the user is expected to have a UserMessage row for every message in `message_ids`. If a UserMessage row is missing, the message will be omitted even if the user has access (e.g. because it went to a public stream.) See also: `access_message`, `bulk_access_messages`. """ return UserMessage.objects.filter( user_profile_id=user_profile_id, message_id__in=message_ids, ).values_list("message_id", flat=True) def render_markdown( message: Message, content: str, realm: Optional[Realm] = None, realm_alert_words_automaton: Optional[ahocorasick.Automaton] = None, mention_data: Optional[MentionData] = None, email_gateway: bool = False, ) -> MessageRenderingResult: """ This is basically just a wrapper for do_render_markdown. """ if realm is None: realm = message.get_realm() sender = message.sender sent_by_bot = sender.is_bot translate_emoticons = sender.translate_emoticons rendering_result = markdown_convert( content, realm_alert_words_automaton=realm_alert_words_automaton, message=message, message_realm=realm, sent_by_bot=sent_by_bot, translate_emoticons=translate_emoticons, mention_data=mention_data, email_gateway=email_gateway, ) return rendering_result def huddle_users(recipient_id: int) -> str: display_recipient: DisplayRecipientT = get_display_recipient_by_id( recipient_id, Recipient.HUDDLE, None, ) # str is for streams. assert not isinstance(display_recipient, str) user_ids: List[int] = [obj["id"] for obj in display_recipient] user_ids = sorted(user_ids) return ",".join(str(uid) for uid in user_ids) def aggregate_message_dict( input_dict: Dict[int, Any], lookup_fields: List[str] ) -> List[Dict[str, Any]]: lookup_dict: Dict[Tuple[Any, ...], Dict[str, Any]] = {} """ A concrete example might help explain the inputs here: input_dict = { 1002: dict(stream_id=5, topic='foo'), 1003: dict(stream_id=5, topic='foo'), 1004: dict(stream_id=6, topic='baz'), } lookup_fields = ['stream_id', 'topic'] The first time through the loop: attribute_dict = dict(stream_id=5, topic='foo') lookup_key = (5, 'foo') lookup_dict = { (5, 'foo'): dict(stream_id=5, topic='foo', unread_message_ids=[1002, 1003], ), ... } result = [ dict(stream_id=5, topic='foo', unread_message_ids=[1002, 1003], ), ... ] """ for message_id, attribute_dict in input_dict.items(): lookup_key = tuple(attribute_dict[f] for f in lookup_fields) if lookup_key not in lookup_dict: obj = {} for f in lookup_fields: obj[f] = attribute_dict[f] obj["unread_message_ids"] = [] lookup_dict[lookup_key] = obj bucket = lookup_dict[lookup_key] bucket["unread_message_ids"].append(message_id) for dct in lookup_dict.values(): dct["unread_message_ids"].sort() sorted_keys = sorted(lookup_dict.keys()) return [lookup_dict[k] for k in sorted_keys] def get_inactive_recipient_ids(user_profile: UserProfile) -> List[int]: rows = ( get_stream_subscriptions_for_user(user_profile) .filter( active=False, ) .values( "recipient_id", ) ) inactive_recipient_ids = [row["recipient_id"] for row in rows] return inactive_recipient_ids def get_muted_stream_ids(user_profile: UserProfile) -> List[int]: rows = ( get_stream_subscriptions_for_user(user_profile) .filter( active=True, is_muted=True, ) .values( "recipient__type_id", ) ) muted_stream_ids = [row["recipient__type_id"] for row in rows] return muted_stream_ids def get_starred_message_ids(user_profile: UserProfile) -> List[int]: return list( UserMessage.objects.filter( user_profile=user_profile, ) .extra( where=[UserMessage.where_starred()], ) .order_by( "message_id", ) .values_list("message_id", flat=True)[0:10000] ) def get_raw_unread_data(user_profile: UserProfile) -> RawUnreadMessagesResult: excluded_recipient_ids = get_inactive_recipient_ids(user_profile) user_msgs = ( UserMessage.objects.filter( user_profile=user_profile, ) .exclude( message__recipient_id__in=excluded_recipient_ids, ) .extra( where=[UserMessage.where_unread()], ) .values( "message_id", "message__sender_id", MESSAGE__TOPIC, "message__recipient_id", "message__recipient__type", "message__recipient__type_id", "flags", ) .order_by("-message_id") ) # Limit unread messages for performance reasons. user_msgs = list(user_msgs[:MAX_UNREAD_MESSAGES]) rows = list(reversed(user_msgs)) return extract_unread_data_from_um_rows(rows, user_profile) def extract_unread_data_from_um_rows( rows: List[Dict[str, Any]], user_profile: Optional[UserProfile] ) -> RawUnreadMessagesResult: pm_dict: Dict[int, RawUnreadPrivateMessageDict] = {} stream_dict: Dict[int, RawUnreadStreamDict] = {} unmuted_stream_msgs: Set[int] = set() huddle_dict: Dict[int, RawUnreadHuddleDict] = {} mentions: Set[int] = set() total_unreads = 0 raw_unread_messages: RawUnreadMessagesResult = dict( pm_dict=pm_dict, stream_dict=stream_dict, muted_stream_ids=[], unmuted_stream_msgs=unmuted_stream_msgs, huddle_dict=huddle_dict, mentions=mentions, old_unreads_missing=False, ) if user_profile is None: return raw_unread_messages muted_stream_ids = get_muted_stream_ids(user_profile) raw_unread_messages["muted_stream_ids"] = muted_stream_ids topic_mute_checker = build_topic_mute_checker(user_profile) def is_row_muted(stream_id: int, recipient_id: int, topic: str) -> bool: if stream_id in muted_stream_ids: return True if topic_mute_checker(recipient_id, topic): return True # Messages sent by muted users are never unread, so we don't # need any logic related to muted users here. return False huddle_cache: Dict[int, str] = {} def get_huddle_users(recipient_id: int) -> str: if recipient_id in huddle_cache: return huddle_cache[recipient_id] user_ids_string = huddle_users(recipient_id) huddle_cache[recipient_id] = user_ids_string return user_ids_string for row in rows: total_unreads += 1 message_id = row["message_id"] msg_type = row["message__recipient__type"] recipient_id = row["message__recipient_id"] sender_id = row["message__sender_id"] if msg_type == Recipient.STREAM: stream_id = row["message__recipient__type_id"] topic = row[MESSAGE__TOPIC] stream_dict[message_id] = dict( stream_id=stream_id, topic=topic, ) if not is_row_muted(stream_id, recipient_id, topic): unmuted_stream_msgs.add(message_id) elif msg_type == Recipient.PERSONAL: if sender_id == user_profile.id: other_user_id = row["message__recipient__type_id"] else: other_user_id = sender_id # The `sender_id` field here is misnamed. It's really # just the other participant in a PM conversation. For # most unread PM messages, the other user is also the sender, # but that's not true for certain messages sent from the # API. Unfortunately, it's difficult now to rename the # field without breaking mobile. pm_dict[message_id] = dict( sender_id=other_user_id, ) elif msg_type == Recipient.HUDDLE: user_ids_string = get_huddle_users(recipient_id) huddle_dict[message_id] = dict( user_ids_string=user_ids_string, ) # TODO: Add support for alert words here as well. is_mentioned = (row["flags"] & UserMessage.flags.mentioned) != 0 is_wildcard_mentioned = (row["flags"] & UserMessage.flags.wildcard_mentioned) != 0 if is_mentioned: mentions.add(message_id) if is_wildcard_mentioned: if msg_type == Recipient.STREAM: stream_id = row["message__recipient__type_id"] topic = row[MESSAGE__TOPIC] if not is_row_muted(stream_id, recipient_id, topic): mentions.add(message_id) else: # nocoverage # TODO: Test wildcard mentions in PMs. mentions.add(message_id) # Record whether the user had more than MAX_UNREAD_MESSAGES total # unreads -- that's a state where Zulip's behavior will start to # be erroneous, and clients should display a warning. raw_unread_messages["old_unreads_missing"] = total_unreads == MAX_UNREAD_MESSAGES return raw_unread_messages def aggregate_unread_data(raw_data: RawUnreadMessagesResult) -> UnreadMessagesResult: pm_dict = raw_data["pm_dict"] stream_dict = raw_data["stream_dict"] unmuted_stream_msgs = raw_data["unmuted_stream_msgs"] huddle_dict = raw_data["huddle_dict"] mentions = list(raw_data["mentions"]) count = len(pm_dict) + len(unmuted_stream_msgs) + len(huddle_dict) pm_objects = aggregate_message_dict( input_dict=pm_dict, lookup_fields=[ "sender_id", ], ) stream_objects = aggregate_message_dict( input_dict=stream_dict, lookup_fields=[ "stream_id", "topic", ], ) huddle_objects = aggregate_message_dict( input_dict=huddle_dict, lookup_fields=[ "user_ids_string", ], ) result: UnreadMessagesResult = dict( pms=pm_objects, streams=stream_objects, huddles=huddle_objects, mentions=mentions, count=count, old_unreads_missing=raw_data["old_unreads_missing"], ) return result def apply_unread_message_event( user_profile: UserProfile, state: RawUnreadMessagesResult, message: Dict[str, Any], flags: List[str], ) -> None: message_id = message["id"] if message["type"] == "stream": message_type = "stream" elif message["type"] == "private": others = [recip for recip in message["display_recipient"] if recip["id"] != user_profile.id] if len(others) <= 1: message_type = "private" else: message_type = "huddle" else: raise AssertionError("Invalid message type {}".format(message["type"])) if message_type == "stream": stream_id = message["stream_id"] topic = message[TOPIC_NAME] state["stream_dict"][message_id] = RawUnreadStreamDict( stream_id=stream_id, topic=topic, ) if stream_id not in state["muted_stream_ids"]: # This next check hits the database. if not topic_is_muted(user_profile, stream_id, topic): state["unmuted_stream_msgs"].add(message_id) elif message_type == "private": if len(others) == 1: other_id = others[0]["id"] else: other_id = user_profile.id # The `sender_id` field here is misnamed. state["pm_dict"][message_id] = RawUnreadPrivateMessageDict( sender_id=other_id, ) else: display_recipient = message["display_recipient"] user_ids = [obj["id"] for obj in display_recipient] user_ids = sorted(user_ids) user_ids_string = ",".join(str(uid) for uid in user_ids) state["huddle_dict"][message_id] = RawUnreadHuddleDict( user_ids_string=user_ids_string, ) if "mentioned" in flags: state["mentions"].add(message_id) if "wildcard_mentioned" in flags: if message_id in state["unmuted_stream_msgs"]: state["mentions"].add(message_id) def remove_message_id_from_unread_mgs(state: RawUnreadMessagesResult, message_id: int) -> None: # The opposite of apply_unread_message_event; removes a read or # deleted message from a raw_unread_msgs data structure. state["pm_dict"].pop(message_id, None) state["stream_dict"].pop(message_id, None) state["huddle_dict"].pop(message_id, None) state["unmuted_stream_msgs"].discard(message_id) state["mentions"].discard(message_id) def estimate_recent_messages(realm: Realm, hours: int) -> int: stat = COUNT_STATS["messages_sent:is_bot:hour"] d = timezone_now() - datetime.timedelta(hours=hours) return ( RealmCount.objects.filter(property=stat.property, end_time__gt=d, realm=realm).aggregate( Sum("value") )["value__sum"] or 0 ) def get_first_visible_message_id(realm: Realm) -> int: return realm.first_visible_message_id def maybe_update_first_visible_message_id(realm: Realm, lookback_hours: int) -> None: recent_messages_count = estimate_recent_messages(realm, lookback_hours) if realm.message_visibility_limit is not None and recent_messages_count > 0: update_first_visible_message_id(realm) def update_first_visible_message_id(realm: Realm) -> None: if realm.message_visibility_limit is None: realm.first_visible_message_id = 0 else: try: first_visible_message_id = ( Message.objects.filter(sender__realm=realm) .values("id") .order_by("-id")[realm.message_visibility_limit - 1]["id"] ) except IndexError: first_visible_message_id = 0 realm.first_visible_message_id = first_visible_message_id realm.save(update_fields=["first_visible_message_id"]) def get_last_message_id() -> int: # We generally use this function to populate RealmAuditLog, and # the max id here is actually systemwide, not per-realm. I # assume there's some advantage in not filtering by realm. last_id = Message.objects.aggregate(Max("id"))["id__max"] if last_id is None: # During initial realm creation, there might be 0 messages in # the database; in that case, the `aggregate` query returns # None. Since we want an int for "beginning of time", use -1. last_id = -1 return last_id def get_recent_conversations_recipient_id( user_profile: UserProfile, recipient_id: int, sender_id: int ) -> int: """Helper for doing lookups of the recipient_id that get_recent_private_conversations would have used to record that message in its data structure. """ my_recipient_id = user_profile.recipient_id if recipient_id == my_recipient_id: return UserProfile.objects.values_list("recipient_id", flat=True).get(id=sender_id) return recipient_id def get_recent_private_conversations(user_profile: UserProfile) -> Dict[int, Dict[str, Any]]: """This function uses some carefully optimized SQL queries, designed to use the UserMessage index on private_messages. It is significantly complicated by the fact that for 1:1 private messages, we store the message against a recipient_id of whichever user was the recipient, and thus for 1:1 private messages sent directly to us, we need to look up the other user from the sender_id on those messages. You'll see that pattern repeated both here and also in zerver/lib/events.py. Ideally, we would write these queries using Django, but even without the UNION ALL, that seems to not be possible, because the equivalent Django syntax (for the first part of this query): message_data = UserMessage.objects.select_related("message__recipient_id").filter( user_profile=user_profile, ).extra( where=[UserMessage.where_private()] ).order_by("-message_id")[:1000].values( "message__recipient_id").annotate(last_message_id=Max("message_id")) does not properly nest the GROUP BY (from .annotate) with the slicing. We return a dictionary structure for convenient modification below; this structure is converted into its final form by post_process. """ RECENT_CONVERSATIONS_LIMIT = 1000 recipient_map = {} my_recipient_id = user_profile.recipient_id query = SQL( """ SELECT subquery.recipient_id, MAX(subquery.message_id) FROM ( (SELECT um.message_id AS message_id, m.recipient_id AS recipient_id FROM zerver_usermessage um JOIN zerver_message m ON um.message_id = m.id WHERE um.user_profile_id=%(user_profile_id)s AND um.flags & 2048 <> 0 AND m.recipient_id <> %(my_recipient_id)s ORDER BY message_id DESC LIMIT %(conversation_limit)s) UNION ALL (SELECT m.id AS message_id, sender_profile.recipient_id AS recipient_id FROM zerver_message m JOIN zerver_userprofile sender_profile ON m.sender_id = sender_profile.id WHERE m.recipient_id=%(my_recipient_id)s ORDER BY message_id DESC LIMIT %(conversation_limit)s) ) AS subquery GROUP BY subquery.recipient_id """ ) with connection.cursor() as cursor: cursor.execute( query, { "user_profile_id": user_profile.id, "conversation_limit": RECENT_CONVERSATIONS_LIMIT, "my_recipient_id": my_recipient_id, }, ) rows = cursor.fetchall() # The resulting rows will be (recipient_id, max_message_id) # objects for all parties we've had recent (group?) private # message conversations with, including PMs with yourself (those # will generate an empty list of user_ids). for recipient_id, max_message_id in rows: recipient_map[recipient_id] = dict( max_message_id=max_message_id, user_ids=[], ) # Now we need to map all the recipient_id objects to lists of user IDs for (recipient_id, user_profile_id) in ( Subscription.objects.filter(recipient_id__in=recipient_map.keys()) .exclude(user_profile_id=user_profile.id) .values_list("recipient_id", "user_profile_id") ): recipient_map[recipient_id]["user_ids"].append(user_profile_id) # Sort to prevent test flakes and client bugs. for rec in recipient_map.values(): rec["user_ids"].sort() return recipient_map def wildcard_mention_allowed(sender: UserProfile, stream: Stream) -> bool: realm = sender.realm # If there are fewer than Realm.WILDCARD_MENTION_THRESHOLD, we # allow sending. In the future, we may want to make this behavior # a default, and also just allow explicitly setting whether this # applies to a stream as an override. if num_subscribers_for_stream_id(stream.id) <= Realm.WILDCARD_MENTION_THRESHOLD: return True if realm.wildcard_mention_policy == Realm.WILDCARD_MENTION_POLICY_NOBODY: return False if realm.wildcard_mention_policy == Realm.WILDCARD_MENTION_POLICY_EVERYONE: return True if realm.wildcard_mention_policy == Realm.WILDCARD_MENTION_POLICY_ADMINS: return sender.is_realm_admin if realm.wildcard_mention_policy == Realm.WILDCARD_MENTION_POLICY_MODERATORS: return sender.is_realm_admin or sender.is_moderator if realm.wildcard_mention_policy == Realm.WILDCARD_MENTION_POLICY_STREAM_ADMINS: # TODO: Change this when we implement stream administrators return sender.is_realm_admin if realm.wildcard_mention_policy == Realm.WILDCARD_MENTION_POLICY_FULL_MEMBERS: return sender.is_realm_admin or (not sender.is_provisional_member and not sender.is_guest) if realm.wildcard_mention_policy == Realm.WILDCARD_MENTION_POLICY_MEMBERS: return not sender.is_guest raise AssertionError("Invalid wildcard mention policy") def parse_message_content_delete_limit( value: Union[int, str], special_values_map: Mapping[str, Optional[int]], ) -> Optional[int]: if isinstance(value, str) and value in special_values_map.keys(): return special_values_map[value] if isinstance(value, str) or value <= 0: raise RequestVariableConversionError("message_content_delete_limit_seconds", value) assert isinstance(value, int) return value