zulip/templates/zerver/api/changelog.md

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# Changelog
This page documents changes to the Zulip Server API over time.
The recommended way for a client like the Zulip mobile or desktop apps
that needs to support interaction with a wide range of different Zulip
server versions is to check the `zulip_feature_level` parameter in the
`/register` and `/server_settings` responses to determine which of the
below features are supported.
## Changes in Zulip 2.2
**Feature level 4**
* `jitsi_server_url`, `development_environment`, `server_generation`,
`password_min_length`, `password_min_guesses`, `max_file_upload_size_mib`,
`max_avatar_file_size_mib`, `server_inline_image_preview`,
`server_inline_url_embed_preview`, `server_avatar_changes_disabled` and
`server_name_changes_disabled` fields are now available via
`POST /register` to make them accessible to all the clients;
they were only internally available to Zulip's web app prior to this.
**Feature level 3**:
* `zulip_version` and `zulip_feature_level` are always returned
in `POST /register`; previously they were only returned if `event_types`
included `zulip_version`.
* Added new `presence_enabled` user notification setting; previously
[presence](/help/status-and-availability) was always enabled.
**Feature level 2**:
* [`POST /messages/{message_id}/reactions`](/api/add-emoji-reaction):
The `reaction_type` parameter is optional; the server will guess the
`reaction_type` if it is not specified (checking custom emoji, then
unicode emoji for any with the provided name).
* `reactions` objects returned by the API (both in `GET /messages` and
in `GET /events`) now include the user who reacted in a top-level
`user_id` field. The legacy `user` dictionary (which had
inconsistent format between those two endpoints) is deprecated.
**Feature level 1**:
* [`GET /server_settings`](/api/server-settings): Added
`zulip_feature_level`, which can be used by clients to detect which
of the features described in this changelog are supported.
* [`POST /register`](/api/register-queue): Added `zulip_feature_level`
to the response if `zulip_version` is among the requested
`event_types`.
* [`GET /users`](/api/get-all-users): User objects for bots now
contain a `bot_owner_id`, replacing the previous `bot_owner` field
(which had the email address of the bot owner).
* [`GET /users/{user_id}`](/api/get-user): Endpoint added.
* [`GET /messages`](/api/get-messages): Add support for string-format
values for the `anchor` parameter, deprecating and replacing the
`use_first_unread_anchor` parameter.
* [`GET /messages`](/api/get-messages) and [`GET
/events`](/api/get-events-from-queue): Message objects now use
`topic_links` rather than `subject_links` to indicate links either
present in the topic or generated by Linkifiers applied to the topic.
* [`POST /users/me/subscriptions`](/api/add-subscriptions): Replaced
`is_announcement_only` boolean with `stream_post_policy` enum for
specifying who can post to a stream.
* [`PATCH /streams/{stream_id}`](/api/update-stream): Replaced
`is_announcement_only` boolean with `stream_post_policy` enum for
specifying who can post to a stream.
* [`GET /streams`](/api/get-all-streams): Replaced
`is_announcement_only` boolean with `stream_post_policy` enum for
specifying who can post to a stream.
* `GET /api/v1/user_uploads`: Added new endpoint for requesting a
temporary URL for an uploaded file that does not require
authentication to access (e.g. for passing from a Zulip desktop,
mobile, or terminal app to the user's default browser).
* Added `EMAIL_ADDRESS_VISIBILITY_NOBODY` possible value for
`email_address_visibility`.
* Added `private_message_policy` realm setting.
* `muted_topic` objects now are a 3-item tuple: (`stream_id`, `topic`,
`date_muted`). Previously, they were a 2-item tuple.
* `GitLab` authentication is now available.
* Added `None` as a video call provider option.
## Changes in Zulip 2.1
* [`GET /users`](/api/get-all-users): Added `include_custom_profile_fields`
to request custom profile field data.
* [`GET /users/me`](/api/get-profile): Added `avatar_url` field,
containing the user's avatar URL, to the response.
* [`GET /users/me/subscriptions`](/api/get-subscribed-streams): Added
`include_subscribers` parameter controlling whether data on the
other subscribers is included. Previous behavior was to always send
subscriber data.
* [`GET /users/me/subscriptions`](/api/get-subscribed-streams):
Stream-level notification settings like `push_notifications` were
changed to be nullable boolean fields (true/false/null), with `null`
meaning that the stream inherits the organization-level default.
Previously, the only values were true/false. A client communicates
support for this feature using `client_capabilities`.
* [`GET /users/me/subscriptions`](/api/get-subscribed-streams): Added
`wildcard_mentions_notify` notification setting, with the same
global-plus-stream-level-override model as other notification settings.
* [`GET /server_settings`](/api/server-settings): Added
`external_authentication_methods` structure, used to display login
buttons nicely in the mobile apps.
* Added `first_message_id` field to Stream objects. This is helpful
for determining whether the stream has any messages older than a
window cached in a client.
* Added `is_web_public` field to Stream objects. This field is
intended to support web-public streams.
* Added `/export/realm` endpoints for triggering a data export.
* `PATCH /realm`: Added `invite_to_stream_policy`,
`create_stream_policy`, `digest_emails_enabled`, `digest_weekday`,
`user_group_edit_policy`, and `avatar_changes_disabled` organization settings.
* Added `fluid_layout_width`, `desktop_icon_count_display`, and
`demote_inactive_streams` display settings.
* `enable_stream_sounds` was renamed to
`enable_stream_audible_notifications`.
* Deprecated `is_home_view`, replacing it with the more readable
`is_muted` (with the opposite meaning).
* Custom profile fields: Added `EXTERNAL_ACCOUNT` field type.
## Changes in Zulip 2.0
* [`POST /messages`](/api/send-message): Added support for using user
IDs and stream IDs for specifying the recipients of a message.
* [`POST /typing`](/api/typing): Added support for specifying the
recipients with user IDs, deprecating the original API of specifying
them using email addresses.
------------------
## Changes not yet stabilized
* [`POST /register`](/api/register-queue): Added `slim_presence`
parameter. Changes the format of presence events, but is still
being changed and should not be used by clients.
* `message_retention_days` field in stream objects.