Add room version upgrades
Implements https://github.com/matrix-org/matrix-doc/issues/1501pull/977/head
Travis Ralston
6 years ago
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# Copyright 2019 New Vector Ltd
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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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swagger: '2.0'
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info:
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title: "Matrix Client-Server Room Upgrades API"
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version: "1.0.0"
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host: localhost:8008
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schemes:
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- https
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- http
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basePath: /_matrix/client/%CLIENT_MAJOR_VERSION%
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consumes:
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- application/json
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produces:
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- application/json
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securityDefinitions:
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$ref: definitions/security.yaml
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paths:
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"/rooms/{roomId}/upgrade":
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post:
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summary: Upgrades a room to a new room version.
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description: |-
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Upgrades the given room to a particular room version, migrating as much
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data as possible over to the new room. See the `room_upgrades`_ module
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for more information on what this entails.
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operationId: upgradeRoom
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security:
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- accessToken: []
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parameters:
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- in: path
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type: string
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name: roomId
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required: true
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description: The ID of the room to upgrade.
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x-example: "!oldroom:example.org"
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- in: body
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name: body
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required: true
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description: The request body
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schema:
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type: object
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properties:
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new_version:
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type: string
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description: The new version for the room.
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example: {"new_version": "2"}
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required: [new_version]
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responses:
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200:
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description: The room was successfully upgraded.
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examples:
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application/json: {
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"replacement_room": "!newroom:example.org"
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}
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schema:
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type: object
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properties:
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replacement_room:
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type: string
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description: The ID of the new room.
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required: [replacement_room]
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400:
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description: |-
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The request was invalid. One way this can happen is if the room version
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requested is not supported by the homeserver.
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examples:
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application/json: {
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"errcode": "M_UNSUPPORTED_ROOM_VERSION",
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"error": "This server does not support that room version"
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}
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schema:
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"$ref": "definitions/errors/error.yaml"
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403:
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description: |-
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The user is not permitted to upgrade the room.
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examples:
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application/json: {
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"errcode": "M_FORBIDDEN",
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"error": "You cannot upgrade this room"
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}
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schema:
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"$ref": "definitions/errors/error.yaml"
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tags:
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- Room ugprades
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{
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"$ref": "core/state_event.json",
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"type": "m.room.tombstone",
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"state_key": "",
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"content": {
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"body": "This room has been replaced",
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"replacement_room": "!newroom:example.org"
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}
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}
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---
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allOf:
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- $ref: core-event-schema/state_event.yaml
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description: 'A state event signifying that a room has been upgraded to a different room version, and that clients should go there.'
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properties:
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content:
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properties:
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body:
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type: string
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description: A server-defined message.
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replacement_room:
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type: string
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description: The new room the client should be visiting.
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required:
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- replacement_room
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- body
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type: object
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state_key:
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description: A zero-length string.
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pattern: '^$'
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type: string
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type:
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enum:
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- m.room.tombstone
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type: string
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title: Indication that the room has been upgraded.
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type: object
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@ -0,0 +1,76 @@
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.. Copyright 2019 New Vector Ltd
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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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Room Upgrades
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=============
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.. _module:room-upgrades:
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From time to time, a room may need to be upgraded to a different room version for a
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variety for reasons. This module defines a way for rooms to upgrade to a different
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room version when needed.
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Events
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------
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{{m_room_tombstone_event}}
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Client behaviour
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----------------
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Clients which understand ``m.room.tombstone`` events MUST:
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* Hide the old room from the user's list of rooms. Permalinks, backlinks, etc should
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still be accessible to this room, however.
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* At the very bottom of the old room's timeline/message view, display a message which
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indicates the room has been upgraded with a permalink to the new room. When the user
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accesses the permalink, they are to be joined to the new room.
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* Note that if the homeserver doesn't support the room version that the user may
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receive an error upon trying to join.
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* If the replacement room has a tombstone event, the client may automatically follow
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the chain until it finds a room which does not have a tombstone in it.
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* Optionally, the client may wish to improve the presentation of unread messages when
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the user is in both the old and new rooms. For example, if the user was not active
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during the upgrade and had unread messages in the old room, the new room may have an
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indicator which shows the sum of unread notifications between the rooms.
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Clients which understand ``m.room.tombstone`` events must also understand the ``predecessor``
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field on ``m.room.create`` events such that:
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* At the top of the scrollback/message view for the new room a message is displayed
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indicating that the room is a continuation of a previous room, with a permalink to
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the old room.
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* Optionally supporting search and other functions of the room to span across the old
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and new rooms.
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{{room_upgrades_cs_http_api}}
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Server behaviour
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----------------
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When the client requests to upgrade a known room to a known version, the server:
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1. Checks that the user has permission to send ``m.room.tombstone`` events in the room.
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2. Creates a replacement room with a ``m.room.create`` event containing a ``predecessor``
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field and the applicable ``room_version``.
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3. Replicates the power levels, privacy, topic, and other transferable state events to
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the new room. This generally excludes membership events.
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4. Moves any local aliases to the new room.
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5. Sends a ``m.room.tombstone`` event to the old room to indicate that it is not intended
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to be used any further.
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6. If possible, the power levels in the old room should also be modified to prevent sending
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of events and inviting new users. For example, setting ``events_default`` and ``invite``
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to the greater of ``50`` and ``users_default + 1``.
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