# Copyright 2023 Tulir Asokan
#
# 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 Application Service Ping API"
  version: "1.0.0"
host: localhost:8008
schemes:
  - https
  - http
basePath: /_matrix/client/v1
consumes:
  - application/json
produces:
  - application/json
securityDefinitions:
  # Note: this is the same access_token definition used elsewhere in the client
  # server API, however this expects an access token for an application service.
  $ref: definitions/security.yaml
paths:
  "/appservice/{appserviceId}/ping":
    post:
      x-addedInMatrixVersion: "1.7"
      summary: |-
        Ask the homeserver to ping the application service to ensure the connection works.
      description: |-
        This API asks the homeserver to call the `/_matrix/app/v1/ping` endpoint
        on the application service to ensure that the homeserver can communicate
        with the application service.

        This API requires the use of an application service access token (`as_token`)
        instead of a typical client's access_token. This API cannot be invoked by
        users who are not identified as application services. Additionally, the
        appservice ID in the path must be the same as the appservice whose `as_token`
        is being used.
      operationId: pingAppservice
      parameters:
        - in: path
          type: string
          name: appserviceId
          description: |-
            The appservice ID of the appservice to ping. This must be the same
            as the appservice whose `as_token` is being used to authenticate the
            request.
          required: true
          x-example: "telegram"
        - in: body
          name: body
          required: true
          schema:
            type: object
            properties:
              transaction_id:
                type: string
                description: |-
                  An optional transaction ID that is passed through to the `/_matrix/app/v1/ping` call.
                example: "mautrix-go_1683636478256400935_123"
      security:
        # again, this is the appservice's token - not a typical client's
        - accessToken: []
      responses:
        200:
          description: The ping was successful
          schema:
            type: object
            properties:
              duration_ms:
                type: integer
                description: |-
                    The duration that the `/_matrix/app/v1/ping` request took
                    from the homeserver's point of view.
          examples:
            application/json: {"duration_ms": 123}
        400:
          description: The application service doesn't have a URL configured. The errcode is `M_URL_NOT_SET`.
          schema:
            $ref: "definitions/errors/error.yaml"
          examples:
            application/json: {
              "errcode": "M_URL_NOT_SET",
              "error": "Application service doesn't have a URL configured"
            }
        403:
          description: The access token used to authenticate the request doesn't belong to an appservice, or belongs to a different appservice than the one in the path. The errcode is `M_FORBIDDEN`.
          schema:
            $ref: "definitions/errors/error.yaml"
          examples:
            application/json: {
              "errcode": "M_FORBIDDEN",
              "error": "Provided access token is not the appservice's as_token"
            }
        502:
          description: |-
            The application service returned a bad status, or the connection failed.
            The errcode is `M_BAD_STATUS` or `M_CONNECTION_FAILED`.

            For bad statuses, the response may include `status` and `body`
            fields containing the HTTP status code and response body text
            respectively to aid with debugging.
          schema:
            type: object
            title: Error
            description: A Matrix-level Error
            properties:
              errcode:
                type: string
                description: An error code.
                enum: [M_BAD_STATUS, M_CONNECTION_FAILED]
              error:
                type: string
                description: A human-readable error message.
                example: Ping returned status 401
              status:
                type: integer
                description: The HTTP status code returned by the appservice.
                example: 401
              body:
                type: string
                description: The HTTP response body returned by the appservice.
                example: "{\"errcode\": \"M_UNKNOWN_TOKEN\"}"
            required: ["errcode"]
          examples:
            application/json: {
              "errcode": "M_BAD_STATUS",
              "error": "Ping returned status 401",
              "status": 401,
              "body": "{\"errcode\": \"M_UNKNOWN_TOKEN\"}"
            }
        504:
          description: The connection to the application service timed out. The errcode is `M_CONNECTION_TIMEOUT`.
          schema:
            $ref: "definitions/errors/error.yaml"
          examples:
            application/json: {
              "errcode": "M_CONNECTION_TIMEOUT",
              "error": "Connection to application service timed out"
            }