Earlier there was a single decorator function to check whether
user can create and edit user groups. This commit adds a new
decorator function to check whether user has permissions to
create user groups.
This was done because in future commits we will be adding a
realm level setting for configuring who can create user groups.
The database operations in 'access_user_group_for_setting' and
'check_add_user_group' used in 'add_user_group' view should be
collectively atomic.
This commit adds transaction.atomic decorator for that purpose.
Earlier, we were using 'send_event' in 'edit_user_group' codepath
which can lead to a situation where we enqueue events but the
function fails at a later stage.
Events should not be sent until we know we're not rolling back.
Fixes part of #30489.
Migrate the following endpoints from @has_request_variables
to @typed_endpoint:
- get_user_group()
- delete_user_group()
- update_user_group_backend()
- update_subgroups_of_user_group()
- get_is_user_group_member()
- get_user_group_members()
- get_subgroups_of_user_group()
With tweaks from tabbott to avoid calling thunks unnecessarily.
This commit adds a server level setting which controls whether the setting
can be set to anonymous user groups. We only allow it in the tests for
now because the UI can only handle named user groups.
This commit fixes the code store correct old value in audit
log data when changing can_mention_group setting from a
anonymous group to another anonymous group. The bug was
because the old value was being computed after updating
the UserGroup object with new members and subgroups and
is fixed by computing the old value for all the cases
and passing it to do_change_user_group_permission_setting.
This commit moves validate_group_setting_value_change,
are_both_setting_values_equal and parse_group_setting_value
functions, which are used for updating the group settings, to
"zerver.lib.user_groups" as these functions will also be used for
group based realm and stream settings and "zerver.lib.user_groups"
file seems a better place to place such functions which are used
at multiple places.
For same reasons, we also move GroupSettingChangeRequest dataclass
to "zerver.lib.user_groups" file.
This commit adds support to pass object containing both old and new
values of the can_mention_group setting, as well as detailed API
documentation for this part of the API system.
Co-authored-by: Tim Abbott <tabbott@zulip.com>
Co-authored-by: Greg PRice <greg@zulip.com>
We now pass the complete configuration object for a setting to
access_user_group_for_setting instead of passing the configuration
object's fields as different variables.
Adds support for bulk-adjusting a single user's membership in multiple
user groups in a single transaction in the low-level actions
functions, for future use by work on #9957.
This is important because the "guests" value isn't one that we'd
expect anyone to pick intentionally, and in particular isn't an
available option for the similar/adjacent "email invitations" setting.
This commit adds id_field_name field to GroupPermissionSetting
type which will be used to store the string formed by concatenation
of setting_name and `_id`.
**Background**
User groups are expected to comply with the DAG constraint for the
many-to-many inter-group membership. The check for this constraint has
to be performed recursively so that we can find all direct and indirect
subgroups of the user group to be added.
This kind of check is vulnerable to phantom reads which is possible at
the default read committed isolation level because we cannot guarantee
that the check is still valid when we are adding the subgroups to the
user group.
**Solution**
To avoid having another transaction concurrently update one of the
to-be-subgroup after the recursive check is done, and before the subgroup
is added, we use SELECT FOR UPDATE to lock the user group rows.
The lock needs to be acquired before a group membership change is about
to occur before any check has been conducted.
Suppose that we are adding subgroup B to supergroup A, the locking protocol
is specified as follows:
1. Acquire a lock for B and all its direct and indirect subgroups.
2. Acquire a lock for A.
For the removal of user groups, we acquire a lock for the user group to
be removed with all its direct and indirect subgroups. This is the special
case A=B, which is still complaint with the protocol.
**Error handling**
We currently rely on Postgres' deadlock detection to abort transactions
and show an error for the users. In the future, we might need some
recovery mechanism or at least better error handling.
**Notes**
An important note is that we need to reuse the recursive CTE query that
finds the direct and indirect subgroups when applying the lock on the
rows. And the lock needs to be acquired the same way for the addition and
removal of direct subgroups.
User membership change (as opposed to user group membership) is not
affected. Read-only queries aren't either. The locks only protect
critical regions where the user group dependency graph might violate
the DAG constraint, where users are not participating.
**Testing**
We implement a transaction test case targeting some typical scenarios
when an internal server error is expected to happen (this means that the
user group view makes the correct decision to abort the transaction when
something goes wrong with locks).
To achieve this, we add a development view intended only for unit tests.
It has a global BARRIER that can be shared across threads, so that we
can synchronize them to consistently reproduce certain potential race
conditions prevented by the database locks.
The transaction test case lanuches pairs of threads initiating possibly
conflicting requests at the same time. The tests are set up such that exactly N
of them are expected to succeed with a certain error message (while we don't
know each one).
**Security notes**
get_recursive_subgroups_for_groups will no longer fetch user groups from
other realms. As a result, trying to add/remove a subgroup from another
realm results in a UserGroup not found error response.
We also implement subgroup-specific checks in has_user_group_access to
keep permission managing in a single place. Do note that the API
currently don't have a way to violate that check because we are only
checking the realm ID now.
We want to make the callers be more explicit about the use of the
user group being accessed, so that the later implemented database lock
can be benefited from the visibility.
Earlier while changing group level group based settings
there was no check if the new value for setting is same as
the current value.
This commit adds this check now a setting value will be only
changed when it is not equal to present value.
Earlier the API endpoints related to user_group accepts and returns a
field `can_mention_group_id` which represents the ID
of user_group whose members can mention the group.
This commit renames this field to `can_mention_group`.
Translators benefit from the extra information in the field names, and
need the reordering freedom that isn’t available with multiple
positional fields.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
Previously we had database level restriction on length of
user group names. Now we add the same restriction to API
level as well, so we can return a better error response.
The user group depedency graph should always be a DAG.
This commit adds code to make sure we keep the graph DAG
while adding subgroups to a user group.
Fixes#25913.
After this commit a notification message is sent to users if they are
added to user_groups by someone else or they are removed from user_groups
by someone else.
Fixes#23642.
View that handled `PATCH user_groups/<int:user_group_id>` required
both name and description parameters to be passed. Due to this
clients had to pass values for both these parameters even if
one of them was changed.
To resolve this name description parameters to
`PATCH user_groups/<int:user_group_id>` are made optional.
Black 23 enforces some slightly more specific rules about empty line
counts and redundant parenthesis removal, but the result is still
compatible with Black 22.
(This does not actually upgrade our Python environment to Black 23
yet.)
Signed-off-by: Anders Kaseorg <anders@zulip.com>
This commit renames existing_subgroups variable to existing_direct_subgroup_ids
in add_subgroups_to_group_backend and remove_subgroups_from_group_backend functions
for better readability.
This commit renames get_user_group_direct_members function to
get_user_group_direct_member_ids as it returns a list of ids
and to avoid it being parallel to get_recursive_group_members,
which returns a QuerySet.
This commit adds 'GET /user_groups/{user_group_id}/members'
endpoint to get members of a user group. "direct_member_only"
parameter can be passed as True to the endpoint to get only
direct members of the user group and not the members of
subgroup.
This commit adds 'GET /user_groups/{id}/members/{id}' endpoint to check
whether a user is member of a group.
This commit also adds for_read parameter to access_user_group_by_id,
which if passed as True will provide access to read user group even
if it a system group or if non-admin acting user is not part of the
group.
Ujjawal Modi
Prakhar Pratyush
bedo
Anders Kaseorg
Vector73
Sahil Batra
Tim Abbott
Zixuan James Li
m-e-l-u-h-a-n