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# Copyright 2021 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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openapi: 3.1.0
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info:
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title: Matrix Federation Knock Room API
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version: 1.0.0
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paths:
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"/make_knock/{roomId}/{userId}":
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get:
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x-addedInMatrixVersion: "1.1"
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summary: Get information required to make a knock event for a room.
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description: |-
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Asks the receiving server to return information that the sending
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server will need to prepare a knock event for the room.
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operationId: makeKnock
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security:
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- signedRequest: []
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parameters:
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- in: path
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name: roomId
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description: The room ID that is about to be knocked.
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required: true
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example: "!abc123:example.org"
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schema:
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type: string
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- in: path
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name: userId
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description: The user ID the knock event will be for.
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required: true
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example: "@someone:example.org"
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schema:
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type: string
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- in: query
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name: ver
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description: The room versions the sending server has support for.
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required: true # knocking was supported in v7
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example:
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- "1"
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- "7"
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schema:
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type: array
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items:
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type: string
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responses:
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"200":
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description: |-
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A template to be used for the rest of the [Knocking Rooms](/server-server-api/#knocking-rooms)
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handshake. Note that events have a different format depending on room version - check the
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[room version specification](/rooms) for precise event formats. **The response body
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here describes the common event fields in more detail and may be missing other
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required fields for a PDU.**
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content:
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application/json:
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schema:
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type: object
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properties:
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room_version:
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type: string
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description: The version of the room where the server is trying to knock.
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example: "7"
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event:
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description: |-
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An unsigned template event. Note that events have a different format
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depending on the room version - check the [room version specification](/rooms)
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for precise event formats.
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type: object
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title: Event Template
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properties:
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sender:
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type: string
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description: The user ID of the knocking member.
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example: "@someone:example.org"
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origin:
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type: string
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description: The name of the resident homeserver.
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example: matrix.org
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origin_server_ts:
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type: integer
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format: int64
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description: A timestamp added by the resident homeserver.
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example: 1234567890
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type:
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type: string
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description: The value `m.room.member`.
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example: m.room.member
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state_key:
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type: string
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description: The user ID of the knocking member.
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example: "@someone:example.org"
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content:
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type: object
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title: Membership Event Content
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description: The content of the event.
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example:
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membership: knock
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properties:
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membership:
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type: string
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description: The value `knock`.
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example: knock
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required:
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- membership
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required:
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- state_key
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- origin
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- origin_server_ts
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- type
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- content
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- sender
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required:
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- room_version # knocking was added in v7
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- event
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examples:
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response:
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value: {
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"room_version": "7",
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"event": {
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"room_id": "!somewhere:example.org",
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"type": "m.room.member",
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"state_key": "@someone:example.org",
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"origin": "example.org",
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"origin_server_ts": 1549041175876,
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"sender": "@someone:example.org",
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"content": {
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"membership": "knock"
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}
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}
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}
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"400":
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description: |-
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The request is invalid or the room the server is attempting
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to knock upon has a version that is not listed in the `ver`
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parameters.
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The error should be passed through to clients so that they
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may give better feedback to users.
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content:
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application/json:
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schema:
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allOf:
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- $ref: ../client-server/definitions/errors/error.yaml
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- type: object
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properties:
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room_version:
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type: string
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description: |-
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The version of the room. Required if the `errcode`
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is `M_INCOMPATIBLE_ROOM_VERSION`.
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examples:
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response:
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value: {
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"errcode": "M_INCOMPATIBLE_ROOM_VERSION",
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"error": "Your homeserver does not support the features required to knock on this room",
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"room_version": "7"
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}
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"403":
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description: |-
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The knocking server or user is not permitted to knock on the room, such as when the
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server/user is banned or the room is not set up for receiving knocks.
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content:
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application/json:
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schema:
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$ref: ../client-server/definitions/errors/error.yaml
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examples:
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response:
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value: {
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"errcode": "M_FORBIDDEN",
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"error": "You are not permitted to knock on this room"
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}
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"404":
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description: |-
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The room that the knocking server is attempting to knock upon is unknown
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to the receiving server.
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content:
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application/json:
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schema:
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$ref: ../client-server/definitions/errors/error.yaml
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examples:
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response:
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value: {
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"errcode": "M_NOT_FOUND",
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"error": "Unknown room"
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}
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"/send_knock/{roomId}/{eventId}":
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put:
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x-addedInMatrixVersion: "1.1"
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summary: Submit a signed knock event to a resident server.
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description: |-
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Submits a signed knock event to the resident server for it to
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accept into the room's graph. Note that events have
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a different format depending on the room version - check
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the [room version specification](/rooms) for precise event formats.
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**The request and response body here describe the common
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event fields in more detail and may be missing other required
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fields for a PDU.**
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operationId: sendKnock
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security:
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- signedRequest: []
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parameters:
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- in: path
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name: roomId
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description: The room ID that is about to be knocked upon.
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required: true
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example: "!abc123:example.org"
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schema:
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type: string
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- in: path
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name: eventId
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description: The event ID for the knock event.
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required: true
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example: $abc123:example.org
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schema:
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type: string
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requestBody:
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content:
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application/json:
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schema:
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type: object
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properties:
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sender:
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type: string
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description: The user ID of the knocking member.
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example: "@someone:example.org"
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origin:
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type: string
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description: The name of the knocking homeserver.
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example: matrix.org
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origin_server_ts:
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type: integer
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format: int64
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description: A timestamp added by the knocking homeserver.
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example: 1234567890
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type:
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type: string
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description: The value `m.room.member`.
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example: m.room.member
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state_key:
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type: string
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description: The user ID of the knocking member.
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example: "@someone:example.org"
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content:
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type: object
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title: Membership Event Content
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description: The content of the event.
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example:
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membership: knock
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properties:
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membership:
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type: string
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description: The value `knock`.
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example: knock
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required:
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- membership
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required:
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- state_key
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- sender
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- origin
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- origin_server_ts
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- type
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- content
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example: {
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"room_id": "!somewhere:example.org",
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"type": "m.room.member",
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"state_key": "@someone:example.org",
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"origin": "example.org",
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"origin_server_ts": 1549041175876,
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"sender": "@someone:example.org",
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"content": {
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"membership": "knock"
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}
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}
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required: true
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responses:
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"200":
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description: |-
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Information about the room to pass along to clients regarding the
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knock.
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content:
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application/json:
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schema:
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type: object
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properties:
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knock_room_state:
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type: array
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items:
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$ref: ../../event-schemas/schema/core-event-schema/stripped_state.yaml
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description: |-
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A list of [stripped state events](/client-server-api/#stripped-state)
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to help the initiator of the knock identify the room.
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example:
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$ref: ../../event-schemas/examples/knock_room_state.json
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required:
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- knock_room_state
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examples:
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response:
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value: {
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"knock_room_state": {
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"$ref": "../../event-schemas/examples/knock_room_state.json"
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}
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}
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"403":
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description: |-
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The knocking server or user is not permitted to knock on the room, such as when the
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server/user is banned or the room is not set up for receiving knocks.
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content:
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application/json:
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schema:
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$ref: ../client-server/definitions/errors/error.yaml
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examples:
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response:
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value: {
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"errcode": "M_FORBIDDEN",
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"error": "You are not permitted to knock on this room"
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}
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"404":
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description: |-
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The room that the knocking server is attempting to knock upon is unknown
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to the receiving server.
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content:
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application/json:
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schema:
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$ref: ../client-server/definitions/errors/error.yaml
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examples:
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response:
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value: {
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"errcode": "M_NOT_FOUND",
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"error": "Unknown room"
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}
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servers:
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- url: "{protocol}://{hostname}{basePath}"
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variables:
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protocol:
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enum:
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- http
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- https
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default: https
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hostname:
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default: localhost:8448
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basePath:
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default: /_matrix/federation/v1
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components:
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securitySchemes:
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signedRequest:
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$ref: definitions/security.yaml#/signedRequest
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