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