matrix-spec-proposals/api/client-server/event_context.yaml

swagger: '2.0'
info:
  title: "Matrix Client-Server Event Context API"
  version: "1.0.0"
host: localhost:8008
schemes:
  - https
  - http
basePath: /_matrix/client/%CLIENT_MAJOR_VERSION%
consumes:
  - application/json
produces:
  - application/json
securityDefinitions:
  $ref: definitions/security.yaml
paths:
  "/rooms/{roomId}/context/{eventId}":
    get:
      summary: Get events and state around the specified event.
      description: |-
        This API returns a number of events that happened just before and
        after the specified event. This allows clients to get the context
        surrounding an event.        
      security:
        - accessToken: []
      parameters:
        - in: path
          type: string
          name: roomId
          description: The room to get events from.
          required: true
          x-example: "!636q39766251:example.com"
        - in: path
          type: string
          name: eventId
          description: The event to get context around.
          required: true
          x-example: "$f3h4d129462ha:example.com"
        - in: query
          type: integer
          name: limit
          description: |-
                        The maximum number of events to return. Default: 10.
          x-example: 3
      responses:
        200:
          description: The events and state surrounding the requested event.
          schema:
            type: object
            description: The events and state surrounding the requested event.
            properties:
              start:
                type: string
                description: |-
                                    A token that can be used to paginate backwards with.
              end:
                type: string
                description: |-
                                    A token that can be used to paginate forwards with.
              events_before:
                type: array
                description: |-
                  A list of room events that happened just before the
                  requested event, in reverse-chronological order.                  
                items:
                  allOf:
                    - "$ref": "definitions/event-schemas/schema/core-event-schema/room_event.yaml"
              event:
                description: |-
                                    Details of the requested event.
                allOf:
                  - "$ref": "definitions/event-schemas/schema/core-event-schema/room_event.yaml"
              events_after:
                type: array
                description: |-
                  A list of room events that happened just after the
                  requested event, in chronological order.                  
                items:
                  allOf:
                    - "$ref": "definitions/event-schemas/schema/core-event-schema/room_event.yaml"
              state:
                type: array
                description: |-
                                    The state of the room at the last event returned.
                items:
                  allOf:
                    - "$ref": "definitions/event-schemas/schema/core-event-schema/state_event.yaml"
          examples:
            application/json: |-
                {
                  "end": "t29-57_2_0_2",
                  "events_after": [
                    {
                      "age": 91911336,
                      "content": {
                        "body": "7",
                        "msgtype": "m.text"
                      },
                      "event_id": "$14460306086CiUaL:localhost:8480",
                      "origin_server_ts": 1446030608551,
                      "room_id": "!sCDvXTtzjpiPxaqkkt:localhost:8480",
                      "type": "m.room.message",
                      "sender": "@test:localhost:8480"
                    }
                  ],
                  "events_before": [
                    {
                      "age": 91911903,
                      "content": {
                        "body": "5",
                        "msgtype": "m.text"
                      },
                      "event_id": "$14460306074UYTlh:localhost:8480",
                      "origin_server_ts": 1446030607984,
                      "room_id": "!sCDvXTtzjpiPxaqkkt:localhost:8480",
                      "type": "m.room.message",
                      "sender": "@test:localhost:8480"
                    }
                  ],
                  "start": "t27-54_2_0_2",
                  "state": [
                    {
                      "age": 3123715284,
                      "content": {
                        "creator": "@test:localhost:8480"
                      },
                      "event_id": "$14429988040dgQAE:localhost:8480",
                      "origin_server_ts": 1442998804603,
                      "room_id": "!sCDvXTtzjpiPxaqkkt:localhost:8480",
                      "state_key": "",
                      "type": "m.room.create",
                      "sender": "@test:localhost:8480"
                    },
                    {
                      "age": 2067105053,
                      "content": {
                        "avatar_url": "mxc://localhost:8480/tVWZTAIIfqtXMZZtmGCkVjTD#auto",
                        "displayname": "Bob2",
                        "membership": "join"
                      },
                      "event_id": "$14440554144URDbf:localhost:8480",
                      "origin_server_ts": 1444055414834,
                      "replaces_state": "$14440552472PgiGk:localhost:8480",
                      "room_id": "!sCDvXTtzjpiPxaqkkt:localhost:8480",
                      "state_key": "@test:localhost:8480",
                      "type": "m.room.member",
                      "sender": "@test:localhost:8480"
                    }
                  ]
                }                
      tags:
        - Room participation