mirror of https://github.com/zulip/zulip.git
225 lines
9.3 KiB
Python
225 lines
9.3 KiB
Python
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from typing import Any, Iterable, List, Mapping, Set, Text, Tuple
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from django.http import HttpRequest, HttpResponse
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from django.utils.translation import ugettext as _
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from zerver.lib.actions import check_stream_name, create_streams_if_needed
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from zerver.lib.request import JsonableError
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from zerver.models import UserProfile, Stream, Subscription, \
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Realm, Recipient, bulk_get_recipients, get_stream_recipient, get_stream, \
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bulk_get_streams, get_realm_stream, DefaultStreamGroup
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def access_stream_for_delete(user_profile: UserProfile, stream_id: int) -> Stream:
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# We should only ever use this for realm admins, who are allowed
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# to delete all streams on their realm, even private streams to
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# which they are not subscribed. We do an assert here, because
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# all callers should have the require_realm_admin decorator.
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assert(user_profile.is_realm_admin)
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error = _("Invalid stream id")
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try:
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stream = Stream.objects.get(id=stream_id)
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except Stream.DoesNotExist:
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raise JsonableError(error)
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if stream.realm_id != user_profile.realm_id:
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raise JsonableError(error)
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return stream
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def access_stream_common(user_profile: UserProfile, stream: Stream,
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error: Text) -> Tuple[Recipient, Subscription]:
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"""Common function for backend code where the target use attempts to
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access the target stream, returning all the data fetched along the
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way. If that user does not have permission to access that stream,
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we throw an exception. A design goal is that the error message is
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the same for streams you can't access and streams that don't exist."""
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# First, we don't allow any access to streams in other realms.
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if stream.realm_id != user_profile.realm_id:
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raise JsonableError(error)
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recipient = get_stream_recipient(stream.id)
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try:
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sub = Subscription.objects.get(user_profile=user_profile,
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recipient=recipient,
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active=True)
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except Subscription.DoesNotExist:
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sub = None
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# If the stream is in your realm and public, you can access it.
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if stream.is_public():
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return (recipient, sub)
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# Or if you are subscribed to the stream, you can access it.
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if sub is not None:
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return (recipient, sub)
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# Otherwise it is a private stream and you're not on it, so throw
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# an error.
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raise JsonableError(error)
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def access_stream_by_id(user_profile: UserProfile, stream_id: int) -> Tuple[Stream, Recipient, Subscription]:
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error = _("Invalid stream id")
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try:
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stream = Stream.objects.get(id=stream_id)
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except Stream.DoesNotExist:
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raise JsonableError(error)
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(recipient, sub) = access_stream_common(user_profile, stream, error)
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return (stream, recipient, sub)
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def check_stream_name_available(realm: Realm, name: Text) -> None:
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check_stream_name(name)
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try:
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get_stream(name, realm)
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raise JsonableError(_("Stream name '%s' is already taken") % (name,))
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except Stream.DoesNotExist:
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pass
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def access_stream_by_name(user_profile: UserProfile,
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stream_name: Text) -> Tuple[Stream, Recipient, Subscription]:
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error = _("Invalid stream name '%s'" % (stream_name,))
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try:
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stream = get_realm_stream(stream_name, user_profile.realm_id)
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except Stream.DoesNotExist:
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raise JsonableError(error)
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(recipient, sub) = access_stream_common(user_profile, stream, error)
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return (stream, recipient, sub)
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def access_stream_for_unmute_topic(user_profile: UserProfile, stream_name: Text, error: Text) -> Stream:
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"""
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It may seem a little silly to have this helper function for unmuting
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topics, but it gets around a linter warning, and it helps to be able
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to review all security-related stuff in one place.
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Our policy for accessing streams when you unmute a topic is that you
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don't necessarily need to have an active subscription or even "legal"
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access to the stream. Instead, we just verify the stream_id has been
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muted in the past (not here, but in the caller).
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Long term, we'll probably have folks just pass us in the id of the
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MutedTopic row to unmute topics.
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"""
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try:
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stream = get_stream(stream_name, user_profile.realm)
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except Stream.DoesNotExist:
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raise JsonableError(error)
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return stream
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def is_public_stream_by_name(stream_name: Text, realm: Realm) -> bool:
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"""Determine whether a stream is public, so that
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our caller can decide whether we can get
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historical messages for a narrowing search.
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Because of the way our search is currently structured,
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we may be passed an invalid stream here. We return
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False in that situation, and subsequent code will do
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validation and raise the appropriate JsonableError.
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Note that this function should only be used in contexts where
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access_stream is being called elsewhere to confirm that the user
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can actually see this stream.
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"""
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try:
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stream = get_stream(stream_name, realm)
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except Stream.DoesNotExist:
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return False
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return stream.is_public()
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def filter_stream_authorization(user_profile: UserProfile,
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streams: Iterable[Stream]) -> Tuple[List[Stream], List[Stream]]:
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streams_subscribed = set() # type: Set[int]
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recipients_map = bulk_get_recipients(Recipient.STREAM, [stream.id for stream in streams])
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subs = Subscription.objects.filter(user_profile=user_profile,
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recipient__in=list(recipients_map.values()),
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active=True)
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for sub in subs:
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streams_subscribed.add(sub.recipient.type_id)
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unauthorized_streams = [] # type: List[Stream]
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for stream in streams:
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# The user is authorized for their own streams
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if stream.id in streams_subscribed:
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continue
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# The user is not authorized for invite_only streams
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if stream.invite_only:
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unauthorized_streams.append(stream)
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authorized_streams = [stream for stream in streams if
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stream.id not in set(stream.id for stream in unauthorized_streams)]
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return authorized_streams, unauthorized_streams
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def list_to_streams(streams_raw: Iterable[Mapping[str, Any]],
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user_profile: UserProfile,
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autocreate: bool=False) -> Tuple[List[Stream], List[Stream]]:
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"""Converts list of dicts to a list of Streams, validating input in the process
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For each stream name, we validate it to ensure it meets our
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requirements for a proper stream name using check_stream_name.
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This function in autocreate mode should be atomic: either an exception will be raised
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during a precheck, or all the streams specified will have been created if applicable.
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@param streams_raw The list of stream dictionaries to process;
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names should already be stripped of whitespace by the caller.
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@param user_profile The user for whom we are retreiving the streams
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@param autocreate Whether we should create streams if they don't already exist
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"""
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# Validate all streams, getting extant ones, then get-or-creating the rest.
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stream_set = set(stream_dict["name"] for stream_dict in streams_raw)
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for stream_name in stream_set:
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# Stream names should already have been stripped by the
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# caller, but it makes sense to verify anyway.
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assert stream_name == stream_name.strip()
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check_stream_name(stream_name)
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existing_streams = [] # type: List[Stream]
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missing_stream_dicts = [] # type: List[Mapping[str, Any]]
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existing_stream_map = bulk_get_streams(user_profile.realm, stream_set)
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for stream_dict in streams_raw:
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stream_name = stream_dict["name"]
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stream = existing_stream_map.get(stream_name.lower())
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if stream is None:
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missing_stream_dicts.append(stream_dict)
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else:
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existing_streams.append(stream)
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if len(missing_stream_dicts) == 0:
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# This is the happy path for callers who expected all of these
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# streams to exist already.
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created_streams = [] # type: List[Stream]
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else:
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# autocreate=True path starts here
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if not user_profile.can_create_streams():
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raise JsonableError(_('User cannot create streams.'))
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elif not autocreate:
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raise JsonableError(_("Stream(s) (%s) do not exist") % ", ".join(
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stream_dict["name"] for stream_dict in missing_stream_dicts))
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# We already filtered out existing streams, so dup_streams
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# will normally be an empty list below, but we protect against somebody
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# else racing to create the same stream. (This is not an entirely
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# paranoid approach, since often on Zulip two people will discuss
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# creating a new stream, and both people eagerly do it.)
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created_streams, dup_streams = create_streams_if_needed(realm=user_profile.realm,
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stream_dicts=missing_stream_dicts)
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existing_streams += dup_streams
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return existing_streams, created_streams
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def access_default_stream_group_by_id(realm: Realm, group_id: int) -> DefaultStreamGroup:
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try:
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return DefaultStreamGroup.objects.get(realm=realm, id=group_id)
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except DefaultStreamGroup.DoesNotExist:
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raise JsonableError(_("Default stream group with id '%s' does not exist." % (group_id,)))
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