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79 lines
3.4 KiB
ReStructuredText
.. Copyright 2019 The Matrix.org Foundation C.I.C.
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..
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.. Licensed under the Apache License, Version 2.0 (the "License");
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.. you may not use this file except in compliance with the License.
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.. You may obtain a copy of the License at
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..
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.. http://www.apache.org/licenses/LICENSE-2.0
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..
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.. Unless required by applicable law or agreed to in writing, software
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.. distributed under the License is distributed on an "AS IS" BASIS,
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.. WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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.. See the License for the specific language governing permissions and
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.. limitations under the License.
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Server Notices
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==============
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.. _module:server-notices:
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Homeserver hosts often want to send messages to users in an official capacity,
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or have resource limits which affect a user's ability to use the homeserver.
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For example, the homeserver may be limited to a certain number of active users
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per month and has exceeded that limit. To communicate this failure to users,
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the homeserver would use the Server Notices room.
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The aesthetics of the room (name, topic, avatar, etc) are left as an implementation
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detail. It is recommended that the homeserver decorate the room such that it looks
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like an official room to users.
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Events
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------
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Notices are sent to the client as normal ``m.room.message`` events with a
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``msgtype`` of ``m.server_notice`` in the server notices room. Events with
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a ``m.server_notice`` ``msgtype`` outside of the server notice room must
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be ignored by clients.
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The specified values for ``server_notice_type`` are:
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:``m.server_notice.usage_limit_reached``:
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The server has exceeded some limit which requires the server administrator
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to intervene. The ``limit_type`` describes the kind of limit reached.
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The specified values for ``limit_type`` are:
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:``monthly_active_user``:
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The server's number of active users in the last 30 days has exceeded the
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maximum. New connections are being refused by the server. What defines
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"active" is left as an implementation detail, however servers are encouraged
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to treat syncing users as "active".
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{{m_room_message_m_server_notice_event}}
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Client behaviour
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----------------
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Clients can identify the server notices room by the ``m.server_notice`` tag
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on the room. Active notices are represented by the `pinned events <#m-room-pinned-events>`_
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in the server notices room. Server notice events pinned in that room should
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be shown to the user through special UI and not through the normal pinned
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events interface in the client. For example, clients may show warning banners
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or bring up dialogs to get the user's attention. Events which are not server
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notice events and are pinned in the server notices room should be shown just
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like any other pinned event in a room.
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The client must not expect to be able to reject an invite to join the server
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notices room. Attempting to reject the invite must result in a
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``M_CANNOT_LEAVE_SERVER_NOTICE_ROOM`` error. Servers should not prevent the user
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leaving the room after joining the server notices room, however the same error
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code must be used if the server will prevent leaving the room.
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Server behaviour
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----------------
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Servers should manage exactly 1 server notices room per user. Servers must
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identify this room to clients with the ``m.server_notice`` tag. Servers should
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invite the target user rather than automatically join them to the server notice
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room.
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How servers send notices to clients, and which user they use to send the events,
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is left as an implementation detail for the server.
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