The operationId is directly used in URLs of API doc pages
to find the OpenAPI data to render. However, this is dash-
separated in the URLs, and having underscore_separated IDs
in OpenAPI data doesn't allow direct comparison of the two.
This commit changes all OperationIDs from underscore_separated
to dash-separated.
Previously, even non-admins had the option to override built-in
emojis in the `Settings Emoji` UI.
This commits essentially limits the functionality of overriding
custom and allows only realm administrators to
override built-in emojis with their custom emojis by adding an
authorization check in the backend.
It also adds relevant tests in `test_realm_emoji` which tests
for the cases where an admin and non admin tries to override
the built-in emoji.
Fixes#18860.
This function had a confusing name, which could result in someone
using it unintentionally when they meant do_reactivate_user.
We also add docstrings for both functions.
We remove timezone setting from UserProfile.property_types
so that we can directly use UserProfile.property_types for
implementation of realm-default values of various user
settings.
This commit migrates the `navbar.html` Django template
to handlebars by creating a new file as `navbar.hbs`
within `/static/templates` which is then rendered
using `ui_init` module.
As a part of migration, we also remove the `search_pills_enabled`
and `embedded` parameters from the context attribute as they
are no longer needed now.
Fixes part of #18792.
Currently, the "Home" link at the top takes one to the doc root,
i.e., /help or /api. This is a little misleading since "Home"
seems to be more synonymous with the Zulip homepage.
This commit adds a proper backlink to the top logo that takes you to
the homepage and renames "Home" to be more specific. The text after
"|" will now take you to the doc root instead (/help or /api). Note
that this allows us to link the /help and /api pages from the
homepage while ensuring that backlinks allow the visitor to get back
to the homepage.
This commit migrates the `right_sidebar.html` Django template
to handlebars by creating a new file as `right_sidebar.hbs`
which is then rendered using `ui_init` module.
It also removes the tests in `test_home` due to the template
migration, since these elements aren't rendered on the backend
anymore.
We also remove `test_compute_show_invites_and_add_streams*`.
Fixes part of #18792.
This commit migrates the `left_sidebar.html` Django template
to handlebars by creating a new file as `left_sidebar.hbs`
which is then rendered using `ui_init` module.
These are the minor changes introduced by virtue of template
migration -
- The `compute_show_invites_and_add_streams` function now
only concerns with the invite_to_realm_policy.
- Renamed the `compute_show_invites_and_add_streams` function
to `compute_show_invites` due to the above change.
- Fixes relevant `test_home.py` tests due to the above
changes.
Fixes part of #18792.
The absence of __init__.py was preventing mypy from following any of
the zerver.openapi imports. These errors were being silenced by
ignore_missing_imports.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
JsonableError has two major benefits over json_error:
* It can be raised from anywhere in the codebase, rather than
being a return value, which is much more convenient for refactoring,
as one doesn't potentially need to change error handling style when
extracting a bit of view code to a function.
* It is guaranteed to contain the `code` property, which is helpful
for API consistency.
Various stragglers are not updated because JsonableError requires
subclassing in order to specify custom data or HTTP status codes.
This commit fixes the bug of always showing
day-mode realm logo when color scheme display
setting is set to automatic but the OS setting
is dark theme. This is because we cannot check
the OS setting on backend and we need to set
the logo url accordingly in frontend only.
So, we remove the logo url computation from
backend completely and instead compute it in
the frontend only.
Fixes#18778.
This adds a new class called MessageRenderingResult to contain the
additional properties we added to the Message object (like alert_words)
as well as the rendered content to ensure typesafe reference. No
behavioral change is made except changes in typing.
This is a preparatory change for adding django-stubs to the backend.
Related: #18777
This PR adds a basic .md template that is followed by lot of /api
pages. Since we have recently done the migration work to ensure that
our REST API documentation pages for individual endpoints are almost
all identical files following a common pattern, we can now get the
payoff of deleting them all in favor of a shared template.
This removes 2000 lines of somewhat finicky configuration from the
codebase, and thus should save significant effort when documenting new
API endpoints in the future.
The markdown files for endpoints or other pages which deviate from the
standard template remain, and the docs are instead generated from
those files using the existing system.
The returned values of get_path function would be
expanded soon, and defining a dataclass would make
the code cleaner for returning and using the fields.
This commit replaces the allow_community_topic_editing boolean with
integer field edit_topic_policy and includes both frontend and
backend changes.
We also update settings_ui.disable_sub_settings_onchange to not
change the color of label as we did previously when the setting
was a checkbox. But now as the setting is dropdown we keep the
label as it is and we don't do anything with label when disabling
dropdowns. Also, this function was used only here so we can safely
change this.
When an unauthenticated user tries to access the /plans page, we
redirect to /accounts/login/?next=plans (note the missing slash
before "plans"). After the user is authenticated, they are then
redirected to /accounts/login/plans, which is an invalid URL. The
correct URL should be just /plans.
This commit solves this by prefixing the "plans" in the query
parameter with a forward slash, which results in the correct
redirect URL, i.e., /plans.
For this extraction, we need to move some context
parameter (from home_real in `views/home.py`) to extra
page_params parameter (of
build_page_params_for_home_page_load in
`lib/home.py`) so handlebars template can access them.
While moving I confirmed that these parameters are not
used elsewhere if some parameter is used elsewhere
(like `apps_page_url`) then I didn't remove it from the
context list, I just added it to the page_params list.
Fixes: #18795.
This results in moving the `zulip_merge_base` parameter to
page_params, so that it's available to JavaScript.
Since this is technically a tiny overlay, it needs to be initialized
before hashchange.js.
Currently, in the FAQ on our /plans page, when the user clicks on
the sponsorship link in the answer for the first question, they
are always taken to /accounts/go, causing them to have to input
their organization URL even if they are on a subdomain page.
This commit makes it so that when the user is on a subdomain page,
they are taken to /upgrade#sponsorship directly. On the other
hand, when they are on a root domain (/) page, they have to go
through /accounts/go and specify their organization's name.
The Hubot project looks to be abandoned; it hasn’t been updated in
years and its own installation instructions don’t work anymore.
Remove our special placement of Hubot alongside Zapier and IFTTT.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
Shift functions used for compatibility from
zerver.lib.home (is_outdated_server) and
zerver.view.compatibility (pop_numerals,
version_lt, find_mobile_os,
is_outdated_desktop_app, is_unsupported_browser)
to zerver.lib.compatibility module.
This locks the message row while a reaction is being added/removed,
which will handle race conditions caused by deleting the message
at the same time.
We make sure that events work happens outside the transaction,
so that in case there's some problem with the queue processor, the
locks aren't held for too long.
As a nice side-effect, we also handle race conditions from double
adding reactions, because once the message is locked, a duplicate
request will wait till the earlier transaction commits, and hence
will not throw `IntegrityErrors`s (rather, will be handled in our
safety check in the /views code itself), which earlier had to be
handled explicitly.
This locks the message while creating a submessage, which
will handle race conditions caused by deleting the message
simultaneously.
We make sure that events work happens outside the transaction,
so that in case there's a problem with the queue processor,
the locks aren't held for too long.
Further commits will start locking the message rows while
adding related fields like reactions or submessages,
to handle races caused by deleting the message itself at the
same time.
The message locking implemented then will create a possibility
of deadlocks, where the related field transaction holds a lock
on the message row, and the message-delete transaction holds a
lock on the database row of the related field (which will also
need to be deleted when the message is deleted), and both
transactions wait for each other.
To prevent such a deadlock, we lock the message itself while
it is being deleted, so that the message-delete transaction
will have to wait till the other transaction (which is about
to delete the related field, and also holds a lock on the
message row) commits.
https://chat.zulip.org/#narrow/near/1185943 has more details.
The current logic to get API pages' title using
OperationID should be used when the first line
of the file explicitly mentions so.
In cases where the files didn't begin with `#` but also
didn't need to get title from OpenAPI summary,
this logic fails and causes Server error.
This particularly happens when the article is invalid,
and the `missing.md` file doesn't need title to be
generated, but doesn't start with `#` either.
This commit fixes the logic of using the generated title and covers the bug.
Checked the email looked OK in `/emails` for both creating realm and
registering within an existing one.
Not sure zerver/tests/test_i18n.py test has been suppressed correctly.
Fixes#17786.
The current logic of geneerating HTML titles requires the title to be
present as a heading in the first line of .md file. However, this will
shortly be no longer true for /api pages where these are
auto-generated from OpenAPI data. Modified the code to fetch the
title from OpenAPI data in case of such pages.
This parameter has never been used, and causes an unnecessary database
query.
We keep the num_push_devices_for_user function, since we may have uses
for it down the line.
Fixes part of #14166.
We record Git details about the merge-base with upstream branches in
the zulip-git-version file, if the upstream repository is available.
Note that the first Git upgrade after merging the parent commit will
not include the merge-base details, since the upstream repository will
not have been available.
Co-authored-by: Tim Abbott <tabbott@zulip.com>
Signed-off-by: Anders Kaseorg <anders@zulip.com>
* Remove unnecessary json_validator for string parameters.
* Update frontend to pass right parameter.
Bump api feature level and highlight the fix for `emojiset`
parameter of `settings/display` endpoint in zulip.yaml file.
Fixes part of #18035.
* Remove unnecessary json validator for string validator.
* Update frontend to pass right validator.
* Update zulip.yaml to pass right parameter for curl request
in openapi.
* Update python_examples to pass right paramater.
Fixes part of #18035.
This removes unnecessary json_validator for string parameters in the
BigBlueButton video calls endpoints. Note that this breaks links to
video meetings sent before the upgrade; there's not much we can do
about that.
Since this is the last commit in this series, we update the
ZULIP_FEATURE_LEVEL for this batch of changes.
Fixes part of #18035.
* Remove unnecessary json_validator for string parameters.
* Remove unnecessary JSON encoding in frontend calls. Structurally,
JavaScript does correct encoding without explicit JSON encoding.
Fixes part of #18035.
Remove unnecessary json_validator for string parameters. This change
does not modify JavaScript because we don't have a frontend for these
API endpoints yet.
Fixes part of #18035.
Raising jsonableError in the authentication form was non-ideal because
it took the user to an ugly page with the returned json.
We also add logging of this rare occurence of the scenario being
handled here.
Thumbor and tc-aws have been dragging their feet on Python 3 support
for years, and even the alphas and unofficial forks we’ve been running
don’t seem to be maintained anymore. Depending on these projects is
no longer viable for us.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
Django's default SMTP implementation can raise various exceptions
when trying to send an email. In order to allow Zulip calling code
to catch fewer exceptions to handle any cause of "email not
sent", we translate most of them into EmailNotDeliveredException.
The non-translated exceptions concern the connection with the
SMTP server. They were not merged with the rest to keep some
details about the nature of these.
Tests are implemented in the test_send_email.py module.
Now that we are passing source realm's id instead of string_id in
source realm selector, it makes sense to rename the "source_realm" field
to "source_realm_id".
In the source realm selector, when we select a realm from which we want
to import the data, we pass the source realm's string_id. The problem
with this approach is that the string_id can be an empty string. This
commit makes the source_realm pass the realm's id instead of string_id.
Now, the source_realm's value will either be an integer or "" (empty
string) when we don't want to import settings from any realm.
This commit adds both frontend and backend code to invite a user as
moderator. We allow only existing owners and admins to invite a user
as a moderator.
The function get_role_for_new_user was added to get role from the
invited_as value, as invited_as values were one of (1,2,3,4)
previously, but it was then changed to be the actual role value,
i.e. one of (100, 200, 400, 600), in 1f8f227444.
So, we can safely remove this function now and use invited_as value
directly and handle realm_creation case by using an if condition.
As of now, editing a widget doesn't update the rendered content.
It's important to ensure that existing votes or options added later on
don't get deleted when rendered.
This seems more complex than it's worth.
For now, we just prevent edits to widgets.
This commit makes the UI clearer that editing widgets isn't allowed.
See also:
https://github.com/zulip/zulip/issues/14229https://github.com/zulip/zulip/issues/14799Fixes#17156
The reason we didn't have this before is that a GET to one of these
URLs would suffice to unsubscribe the user; but with the
List-Unsubscribe system, we need to allow POST from a third-party page
as well.
This extends the /json/typing endpoint to also accept
stream_id and topic. With this change, the requests
sent to /json/typing should have these:
* `to`: a list set to
- recipients for a PM
- stream_id for a stream message
* `topic`, in case of stream message
along with `op`(start or stop).
On receiving a request with stream_id and topic, we send
typing events to clients with stream_typing_notifications set
to True for all users subscribed to that stream.
This commit adds support for a `None` option in the dropdown menu
of `Notification sound`. When this option is selected, no audible
notification is sent to the user.
`None` will appear as the first option in the dropdown menu, since
this is not categorized as a playable audio.
This new option is added so that folks can disable audio notifications
without losing their other notification configuration (like for PMs, mentions).
Necessary test case is added for this new option.
Fixes#16090.
model__id syntax implies needing a JOIN on the model table to fetch the
id. That's usually redundant, because the first table in the query
simply has a 'model_id' column, so the id can be fetched directly.
Django is actually smart enough to not do those redundant joins, but we
should still avoid this misguided syntax.
The exceptions are ManytoMany fields and queries doing a backward
relationship lookup. If "streams" is a many-to-many relationship, then
streams_id is invalid - streams__id syntax is needed. If "y" is a
foreign fields from X to Y:
class X:
y = models.ForeignKey(Y)
then object x of class X has the field x.y_id, but y of class Y doesn't
have y.x_id. Thus Y queries need to be done like
Y.objects.filter(x__id__in=some_list)
This commit adds an API to `zproject/urls.py` to edit/update
the realm linkifier. Its helper function to update the
database is added in `zerver/lib/actions.py`.
`zulip.yaml` is documented accordingly as well, clearly
stating that this API updates one linkifier at a time.
The tests are added for the API and helper function which
updates the realm linkifier.
Fixes#10830.
Linkifier error message: `Filter not found` is
updated to `Linkifier not found.`.
Similarly, `filter_id` description is updated to:
`The ID of the linkifier that you want to remove.`,
renamed the term `filter` with `linkifier`, in `zulip.yaml`.
We move compose.html to compose.hbs file while keeping
`#compose` still in `home.html` as a hanger
where append rest of the elements.
This will provide us with two benefits:
* We could share common elements between message_edit_form and
compose.
* We can insert compose directly in any element. We may decide to
do it for recent topics.
This prevents us from having to json encode every field in the POST
request to /realm/playgrounds, and keeps the client logic simpler
when adding a playground.
django.utils.http.is_safe_url is a deprecated alias of
django.utils.http.url_has_allowed_host_and_scheme as of Django 3.0,
and will be removed in Django 4.0.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
django.utils.translation.ugettext is a deprecated alias of
django.utils.translation.gettext as of Django 3.0, and will be removed
in Django 4.0.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
This wasn't being validated before. There wasn't any possibility to
actually succeed in moving a private message, because the codepath would
fail at assert message.is_stream_message() in do_update_message - but we
should have proper error handling for that case instead of internal
server errors.
Otherwise an admin can move a topic from a private stream they're no
longer a part of - including the newest messages in the topic, that
they're not supposed to have access to.
A bug in the implementation of the topic moving API resulted in
organization administrators being able to move messages to streams they
shouldn't be allowed to - private streams they weren't subscribed to and
streams in other organization hosted by the same Zulip installation.
In our current model realm admins can't send messages to private streams
they're not subscribed to - and being able move messages to a
stream effectively allows to send messages to that stream and thus the
two need to be consistent.
A bug in the implementation of the all_public_streams API feature
resulted in guest users being able to receive message traffic to public
streams that should have been only accessible to members of the
organization.
A bug in the implementation of the can_forge_sender permission
(previously is_api_super_user) resulted in users with this permission
being able to send messages appearing as if sent by a system bots,
including to other organizations hosted by the same Zulip installation.
- The send message API had a bug allowing an api super user to
use forging to send messages to other realms' streams, as a
cross-realm bot. We fix this most directly by eliminating the
realm_str parameter - it is not necessary for any valid current use
case. The email gateway doesn't use this API despite the comment in
that block suggesting otherwise.
- The conditionals inside access_stream_for_send_message are changed up
to improve security. They were generally not ordered very well,
allowing the function to successfully return due to very weak
acceptance conditions - skipping the higher importance checks that
should lead to raising an error.
- The query count in test_subs is decreased because
access_stream_for_send_message returns earlier when doing its check
for a cross-realm bot sender - some subscription checking queries are
skipped.
- A linkifier test in test_message_dict needs to be changed. It didn't
make much sense in the first place, because it was creating a message
by a normal user, to a stream outside of the user's realm. That
shouldn't even be allowed.
Organization admins can use this setting to restrict the maximum
rating of GIFs that will be retrieved from GIPHY. Also, there
is option to disable GIPHY too.
* This introduces a new event type `realm_linkifiers` and
a new key for the initial data fetch of the same name.
Newer clients will be expected to use these.
* Backwards compatibility is ensured by changing neither
the current event nor the /register key. The data which
these hold is the same as before, but internally, it is
generated by processing the `realm_linkifiers` data.
We send both the old and the new event types to clients
whenever the linkifiers are changed.
Older clients will simply ignore the new event type, and
vice versa.
* The `realm/filters:GET` endpoint (which returns tuples)
is currently used by none of the official Zulip clients.
This commit replaces it with `realm/linkifiers:GET` which
returns data in the new dictionary format.
TODO: Update the `get_realm_filters` method in the API
bindings, to hit this new URL instead of the old one.
* This also updates the webapp frontend to use the newer
events and keys.
* Don't require strings to be unnecessarily JSON-encoded.
* Use check_capped_string rather than custom code for length checks.
* Update frontend to pass the right parameters.
With a much simplified populate_data_for_request design suggested by
Anders; we only support a handful of data types, all of which are
correctly encoded automatically by jQuery.
Fixes part of #18035.
Previously, when unmuting a user, we used to make
two database fetches - one to verify that the user
is has been muted before, and one while actually
unmuting the user.
This reduces that to one, by passing around the
`MutedUser` object fetched in the first round.
Since the new function returns `Optional[MutedUser]`,
we need to use a hack for events tests, because
mypy does not yet use the type inferred from
`assert foo is not None` in nested functions like lambdas.
See python/mypy@8780d45507.
This was used by the old native Zulip Android app
(zulip/zulip-android). That app has been undeveloped for enough years
that we believe it no longer functions; as a result, there's no reason
to keep a prototype API endpoint for it (that we believe never worked).
This endpoint was needed by the ancient pre-electron desktop app
written in QT; we removed support for that in practice a long time
ago, and even the custom error messages for it in
5a22e73cc6.
So we can delete this endpoint as well.
We keep the error message same for all cases when a user is not
allowed to subscribe others for all values of invite_to_stream_policy.
We raise error with different message for guest cases because it
is handled by decorators. We aim to change this behavior in future.
Explaining the details in error message isn't much important as
we do not show errors probably in API only, as we do not the show
the options itself in the frontend.
We keep the error message same for all cases when a user is not
allowed to invite others for all values of invite_to_realm_policy.
We raise error with different message for guest cases because it
is handled by decorators. We aim to change this behavior in future.
Explaining the details in error message isn't much important as
we do not show errors probably in API only, as we do not the show
the options itself in the frontend.
This makes it much more clear that this feature does JSON encoding,
which previously was only indicated in the documentation.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
We add moderators and full members option to invite_to_realm_policy
by using COMMON_POLICY_TYPES and use can_invite_others_to_realm helper
added in previous commit. This commit only does the backend work,
frontend work will be done in separate commit.
This commit replaces invite_by_admins_policy, which was a bool field,
with a new enum field invite_by_realm_policy.
Though the final goal is to add moderators and full members option
using COMMON_POLICY_TYPES, but this will be done in a separate
commit to make this easy for review.
We send the whole data set as a part of the event rather than
doing an add/remove operation for couple of reasons:
* This would make the client logic simpler.
* The playground data is small enough for us to not worry
about performance.
Tweaked both `fetch_initial_state_data` and `apply_events` to
handle the new playground event.
Tests added to validate the event matches the expected schema.
Documented realm_playgrounds sections inside /events and
/register to support our openapi validation system in test_events.
Tweaked other tests like test_event_system.py and test_home.py
to account for the new event being generated.
Lastly, documented the changes to the API endpoints in
api/changelog.md and bumped API_FEATURE_LEVEL.
Tweaked by tabbott to add an `id` field in RealmPlayground objects
sent to clients, which is essential to sending the API request to
remove one.
Similar to the previous commit, we have added a `do_*` function
which does the deletion from the DB. The next commit handles sending
the events when both adding and deleting a playground entry.
Added the openAPI format data to zulip.yaml for DELETE
/realm/playgrounds/{playground_id}. Also added python and curl
examples to remove-playground.md.
Tests added.
This endpoint will allow clients to create a playground entry
containing the name, pygments language and url_prefix for the
playground of their choice.
Introduced the `do_*` function in-charge of creating the entry in
the model. Handling the process of sending events which will be
done in a follow up commit.
Added the openAPI format data to zulip.yaml for POST
/realm/playgrounds. Also added python and curl examples for using
the endpoint in its markdown documented (add-playground.md).
Tests added.
Adds backend code for the mute users feature.
This is just infrastructure work (database
interactions, helpers, tests, events, API docs
etc) and does not involve any behavioral/semantic
aspects of muted users.
Adds POST and DELETE endpoints, to keep the
URL scheme mostly consistent in terms of `users/me`.
TODOs:
1. Add tests for exporting `zulip_muteduser` database table.
2. Add dedicated methods to python-zulip-api to be used
in place of the current `client.call_endpoint` implementation.
This is a prep change to eventually completely
replace the term "filter" with "linkifier" in
the codebase.
This only renames files. Code changes will be
done in further commits.
We use GIPHY web SDK to create popover containing GIFs in a
grid format. Simply clicking on the GIFs will insert the GIF in the compose
box.
We add GIPHY logo to compose box action icons which opens the GIPHY
picker popover containing GIFs with "Powered by GIPHY"
attribution.
Instead of validating `op` value later, this commit does that
in `REQ`.
Also helps avoiding duplication of this validation when
stream typing notifications feature is added.
This adds the is_user_active with the appropriate code for setting the
value correctly in the future. In the following commit a migration to
backfill the value for existing Subscriptions will be added.
To ensure correct user_profile.is_active handling also in tests, we
replace all direct .is_active mutation with calls to appropriate
functions.
The moderators-only option was actually added in the previous
commit for create_stream_policy as we use the same function
'has_permission' for both the policies. But we add the error
handling code and tests for moderators-only option in this
commit.
In 1a12e112d9, this page was converted
to use portico styling, but we intentionally left this page not using
the portico_content class since we didn't want the header/footer.
We still don't want the header/footer clutter, so instead, we achieve
that same goal using the isolated_page flag.
This is part of our general process of replacing emails, which are not
static with time, with user_ids when referring to users in the API.
We still keep the `email` reference option, since it can be useful for
linking third-party applications to Zulip on an intranet that might
have a user's corporate email handy and not want to do the extra round
trip to lookup the user.
The name of the parameter, user_id_or_email, was chosen to to make it
clear that the default/preferred option is user_id.
Fixes#14304.
TextField is used to allow users to set long stream + topic narrow
names in the urls.
We currently restrict users to only set "all_messages" and
"recent_topics" as narrows.
This commit achieves 3 things:
* Removes recent topics as the default view which loads when
hash is empty.
* Loads default_view when hash is empty.
* Loads default_view on pressing escape key when it is unhandled by
other present UI elements.
NOTE: After this commit loading zulip with an empty hash will
automatically set hash to default_view. Ideally, we'd just display
the default view without a hash, but that involves extra complexity.
One exception is when user is trying to load an overlay directly,
i.e. zulip is loaded with an overlay hash. In this case,
we render recent topics is background irrespective of default_view.
We consider this last detail to be a bug not important enough to block
adding this setting.
Add new rest api endpoint GET users/{email} for looking up a user by
email, which is useful especially for corporate API applications that
might already have a user's email address.
Fixes#14302.
PIG208
akshatdalton
Suyash Vardhan Mathur
aryanshridhar
Tim Abbott
sahil839
Ganesh Pawar
Eeshan Garg
Anders Kaseorg
Steve Howell
Aman Agrawal
Riken Shah
Vishnu KS
Gaurav Pandey
Abhijeet Prasad Bodas
Gilbert Bishop-White
Mateusz Mandera
Cyril Pletinckx
Siddharth Asthana
Dinesh
Sumanth V Rao
shanukun
tushar912