Google Cloud Platform Update Project IAM Policy

arazzo: 1.0.1
info:
  title: Google Cloud Platform Update Project IAM Policy
  summary: Read a project IAM policy, add a member binding, and write the policy back with the etag.
  description: >-
    Safely modifies a project's IAM policy using the read-modify-write pattern.
    The workflow first reads the current policy to capture its etag and existing
    bindings, then writes back a new policy that grants a role to a member while
    passing the captured etag for optimistic concurrency, and finally re-reads
    the policy to confirm the change. 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: projectsApi
  url: ../openapi/google-cloud-platform-projects-api-openapi.yml
  type: openapi
workflows:
- workflowId: update-project-iam-policy
  summary: Grant an IAM role to a member on a project using read-modify-write.
  description: >-
    Reads the current project IAM policy, sets a new binding with the captured
    etag, then re-reads the policy to confirm.
  inputs:
    type: object
    required:
    - resource
    - role
    - member
    properties:
      resource:
        type: string
        description: The project resource, e.g. projects/12345.
      role:
        type: string
        description: The IAM role to grant, e.g. roles/viewer.
      member:
        type: string
        description: The member to grant the role to, e.g. user:jane@example.com.
  steps:
  - stepId: getPolicy
    description: >-
      Read the current IAM policy for the project to capture its etag and
      version for the subsequent set call.
    operationId: cloudresourcemanager.projects.getIamPolicy
    parameters:
    - name: resource
      in: path
      value: $inputs.resource
    requestBody:
      contentType: application/json
      payload:
        options:
          requestedPolicyVersion: 3
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      etag: $response.body#/etag
      version: $response.body#/version
  - stepId: setPolicy
    description: >-
      Write back a policy granting the role to the member. The captured etag
      is supplied for optimistic concurrency to avoid clobbering changes.
    operationId: cloudresourcemanager.projects.setIamPolicy
    parameters:
    - name: resource
      in: path
      value: $inputs.resource
    requestBody:
      contentType: application/json
      payload:
        policy:
          version: 3
          etag: $steps.getPolicy.outputs.etag
          bindings:
          - role: $inputs.role
            members:
            - $inputs.member
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      newEtag: $response.body#/etag
  - stepId: confirmPolicy
    description: >-
      Re-read the IAM policy to confirm the new binding was persisted.
    operationId: cloudresourcemanager.projects.getIamPolicy
    parameters:
    - name: resource
      in: path
      value: $inputs.resource
    requestBody:
      contentType: application/json
      payload:
        options:
          requestedPolicyVersion: 3
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      bindings: $response.body#/bindings
  outputs:
    previousEtag: $steps.getPolicy.outputs.etag
    newEtag: $steps.setPolicy.outputs.newEtag
    bindings: $steps.confirmPolicy.outputs.bindings