Autodesk Subscribe to Events with a Signed Webhook

arazzo: 1.0.1
info:
  title: Autodesk Subscribe to Events with a Signed Webhook
  summary: Discover event systems and events, set a signing secret, create a scoped hook, and confirm it is active.
  description: >-
    How an integration stops polling Autodesk and starts being told. The workflow
    discovers which event systems exist, lists the events a chosen system emits,
    installs the secret token Autodesk uses to sign callback payloads, creates a hook
    scoped to a single folder, and reads the hook back to confirm it is active. The
    signing secret is set before the hook is created so that no unsigned callback can
    ever arrive. Every step spells out its request inline so the flow can be read and
    executed without opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: webhooksApi
  url: ../openapi/autodesk-webhooks-openapi.yml
  type: openapi
workflows:
- workflowId: subscribe-to-events
  summary: Stand up a signed, folder-scoped webhook subscription.
  description: >-
    Lists systems and their events, installs a payload signing secret, creates a hook
    for one event scoped to one folder, and confirms the resulting subscription.
  inputs:
    type: object
    required:
    - system
    - event
    - callbackUrl
    - secretToken
    - folderUrn
    properties:
      system:
        type: string
        description: >-
          The event system to subscribe within (e.g. "data", "derivative",
          "adsk.c4r").
      event:
        type: string
        description: >-
          The event type to subscribe to (e.g. "dm.version.added",
          "extraction.finished").
      callbackUrl:
        type: string
        description: The HTTPS endpoint Autodesk POSTs callbacks to.
      secretToken:
        type: string
        description: >-
          Secret used to sign callback payloads. Arrives on callbacks in the
          x-adsk-signature header and must be verified before trusting a payload.
      folderUrn:
        type: string
        description: The folder URN to scope the subscription to.
      filter:
        type: string
        description: >-
          Optional JSON filter expression narrowing which events fire the hook
          (e.g. by file extension).
  steps:
  - stepId: listSystems
    description: >-
      Discover which event systems currently accept webhook subscriptions rather than
      hardcoding a system string that may be retired.
    operationId: getSystems
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      systems: $response.body#/data
  - stepId: listEvents
    description: >-
      List the events the chosen system emits, confirming the event to subscribe to
      is real before a hook is created against it.
    operationId: getSystemEvents
    parameters:
    - name: system
      in: path
      value: $inputs.system
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      events: $response.body#/data
  - stepId: installSigningSecret
    description: >-
      Install the secret token Autodesk signs callback payloads with. Done before the
      hook exists so that every callback the hook ever fires is signed.
    operationId: createToken
    requestBody:
      contentType: application/json
      payload:
        token: $inputs.secretToken
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      tokenInstalled: $statusCode
  - stepId: createSubscription
    description: >-
      Create the hook, scoped to a single folder so the callback endpoint is not
      flooded with events from the whole hub. autoReactivateHook keeps the
      subscription alive through a transient outage of the callback endpoint.
    operationId: createHook
    parameters:
    - name: system
      in: path
      value: $inputs.system
    - name: event
      in: path
      value: $inputs.event
    requestBody:
      contentType: application/json
      payload:
        callbackUrl: $inputs.callbackUrl
        scope:
          folder: $inputs.folderUrn
        filter: $inputs.filter
        autoReactivateHook: true
        hookAttribute:
          createdByWorkflow: autodesk-webhook-subscription-workflow
    successCriteria:
    - condition: $statusCode == 201
    outputs:
      hookId: $response.body#/hookId
      tenant: $response.body#/tenant
      status: $response.body#/status
  - stepId: confirmSubscription
    description: >-
      Read the hook back to confirm it is active and pointed at the intended callback
      URL and scope.
    operationId: getHook
    parameters:
    - name: system
      in: path
      value: $inputs.system
    - name: event
      in: path
      value: $inputs.event
    - name: hook_id
      in: path
      value: $steps.createSubscription.outputs.hookId
    successCriteria:
    - condition: $statusCode == 200
    - context: $response.body
      condition: $.status == "active"
      type: jsonpath
    outputs:
      hookId: $response.body#/hookId
      status: $response.body#/status
      callbackUrl: $response.body#/callbackUrl
      scope: $response.body#/scope
      createdDate: $response.body#/createdDate
  outputs:
    hookId: $steps.confirmSubscription.outputs.hookId
    status: $steps.confirmSubscription.outputs.status
    callbackUrl: $steps.confirmSubscription.outputs.callbackUrl