Azure Web PubSub Direct Connection Message

arazzo: 1.0.1
info:
  title: Azure Web PubSub Direct Connection Message
  summary: Confirm a connection exists, then send a targeted message to just that connection.
  description: >-
    A targeted delivery pattern: before sending to a single WebSocket connection,
    the app server verifies the connection is still attached so it does not waste
    a send on a dead connection. When the connection exists a message is sent
    directly to it; when it is gone the flow ends. Each step inlines its request —
    Authorization bearer header, required api-version query, the message body, and
    documented HEAD 200/404 and send 202 status codes.
  version: 1.0.0
sourceDescriptions:
- name: hubApi
  url: ../openapi/microsoft-azure-web-pubsub-hub-api-openapi.yml
  type: openapi
workflows:
- workflowId: direct-connection-message
  summary: Verify a connection exists, then send a message directly to that connection.
  description: >-
    Probes a connection with connectionExists and, when present, delivers a
    plain-text message via sendToConnection; otherwise ends.
  inputs:
    type: object
    required:
    - accessToken
    - hub
    - connectionId
    - message
    properties:
      accessToken:
        type: string
        description: JWT bearer token for the Web PubSub data plane.
      apiVersion:
        type: string
        description: Data plane REST API version.
        default: "2024-01-01"
      hub:
        type: string
        description: Target hub name.
      connectionId:
        type: string
        description: The connection id to verify and message.
      message:
        type: string
        description: The plain-text message to deliver to the connection.
  steps:
  - stepId: checkConnection
    description: >-
      Probe whether the connection is still attached. A 200 means it exists; a
      404 means it is gone.
    operationId: webPubSub_connectionExists
    parameters:
    - name: Authorization
      in: header
      value: "Bearer $inputs.accessToken"
    - name: hub
      in: path
      value: $inputs.hub
    - name: connectionId
      in: path
      value: $inputs.connectionId
    - name: api-version
      in: query
      value: $inputs.apiVersion
    successCriteria:
    - condition: $statusCode == 200 || $statusCode == 404
    outputs:
      existsStatus: $statusCode
    onSuccess:
    - name: connectionPresent
      type: goto
      stepId: sendToConnection
      criteria:
      - condition: $statusCode == 200
    - name: connectionAbsent
      type: end
      criteria:
      - condition: $statusCode == 404
  - stepId: sendToConnection
    description: >-
      Deliver the supplied plain-text message directly to the single connection.
    operationId: webPubSub_sendToConnection
    parameters:
    - name: Authorization
      in: header
      value: "Bearer $inputs.accessToken"
    - name: hub
      in: path
      value: $inputs.hub
    - name: connectionId
      in: path
      value: $inputs.connectionId
    - name: api-version
      in: query
      value: $inputs.apiVersion
    requestBody:
      contentType: text/plain
      payload: $inputs.message
    successCriteria:
    - condition: $statusCode == 202
    outputs:
      sendStatus: $statusCode
  outputs:
    existsStatus: $steps.checkConnection.outputs.existsStatus
    sendStatus: $steps.sendToConnection.outputs.sendStatus