# Copyright 2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
swagger: '2.0'
info:
  title: "Matrix Client-Server Rooms API"
  version: "1.0.0"
host: localhost:8008
schemes:
  - https
  - http
basePath: /_matrix/client/v3
consumes:
  - application/json
produces:
  - application/json
securityDefinitions:
  $ref: definitions/security.yaml
paths:
  "/rooms/{roomId}/messages":
    get:
      summary: Get a list of events for this room
      description: |-
        This API returns a list of message and state events for a room. It uses
        pagination query parameters to paginate history in the room.

        *Note*: This endpoint supports lazy-loading of room member events. See
        [Lazy-loading room members](/client-server-api/#lazy-loading-room-members) for more information.
      operationId: getRoomEvents
      security:
        - accessToken: []
      parameters:
        - in: path
          type: string
          name: roomId
          description: The room to get events from.
          required: true
          x-example: "!636q39766251:example.com"
        - in: query
          type: string
          name: from
          description: |-
            The token to start returning events from. This token can be obtained
            from a `prev_batch` or `next_batch` token returned by the `/sync` endpoint,
            or from an `end` token returned by a previous request to this endpoint.

            This endpoint can also accept a value returned as a `start` token
            by a previous request to this endpoint, though servers are not
            required to support this. Clients should not rely on the behaviour.
          required: true
          x-example: "s345_678_333"
        - in: query
          type: string
          name: to
          description: |-
            The token to stop returning events at. This token can be obtained from
            a `prev_batch` or `next_batch` token returned by the `/sync` endpoint,
            or from an `end` token returned by a previous request to this endpoint.
          required: false
        - in: query
          type: string
          enum: ["b", "f"]
          name: dir
          description: |-
            The direction to return events from. If this is set to `f`, events
            will be returned in chronological order starting at `from`. If it
            is set to `b`, events will be returned in *reverse* chronological
            order, again starting at `from`.
          required: true
          x-example: "b"
        - in: query
          type: integer
          name: limit
          description: |-
            The maximum number of events to return. Default: 10.
          x-example: "3"
        - in: query
          type: string
          name: filter
          description: |-
            A JSON RoomEventFilter to filter returned events with.
          x-example: |-
            {"contains_url":true}
      responses:
        200:
          description: A list of messages with a new token to request more.
          schema:
            type: object
            description: A list of messages with a new token to request more.
            properties:
              start:
                type: string
                description: |-
                  A token corresponding to the start of `chunk`. This will be the same as
                  the value given in `from`.
              end:
                type: string
                description: |-
                  A token corresponding to the end of `chunk`. This token can be passed
                  back to this endpoint to request further events.

                  If no further events are available (either because we have
                  reached the start of the timeline, or because the user does
                  not have permission to see any more events), this property
                  is omitted from the response.
              chunk:
                type: array
                description: |-
                  A list of room events. The order depends on the `dir` parameter.
                  For `dir=b` events will be in reverse-chronological order,
                  for `dir=f` in chronological order. (The exact definition of `chronological`
                  is dependent on the server implementation.)

                  Note that an empty `chunk` does not *necessarily* imply that no more events
                  are available. Clients should continue to paginate until no `end` property
                  is returned.
                items:
                  "$ref": "../../event-schemas/schema/core-event-schema/room_event.yaml"
              state:
                type: array
                description: |-
                  A list of state events relevant to showing the `chunk`. For example, if
                  `lazy_load_members` is enabled in the filter then this may contain
                  the membership events for the senders of events in the `chunk`.

                  Unless `include_redundant_members` is `true`, the server
                  may remove membership events which would have already been
                  sent to the client in prior calls to this endpoint, assuming
                  the membership of those members has not changed.
                items:
                  $ref: "../../event-schemas/schema/core-event-schema/state_event.yaml"
            required: [start, chunk]
          examples:
            application/json: {
                "start": "t47429-4392820_219380_26003_2265",
                "end": "t47409-4357353_219380_26003_2265",
                "chunk": [
                  {
                    "room_id": "!636q39766251:example.com",
                    "$ref": "../../event-schemas/examples/m.room.message$m.text.yaml"
                  },
                  {
                    "room_id": "!636q39766251:example.com",
                    "$ref": "../../event-schemas/examples/m.room.name.yaml"
                  },
                  {
                    "room_id": "!636q39766251:example.com",
                    "$ref": "../../event-schemas/examples/m.room.message$m.video.yaml"
                  }
                ]
              }
        403:
          description: >
            You aren't a member of the room.
      tags:
        - Room participation
