ReadMe Upsert A Changelog Post

arazzo: 1.0.1
info:
  title: ReadMe Upsert A Changelog Post
  summary: Find a changelog post by slug and update it if it exists, otherwise create it.
  description: >-
    Lets release tooling idempotently publish a changelog entry. The workflow
    lists changelog posts on the branch, branches on whether a post with the
    target slug is present, and then either updates the matched post or creates
    a new one. 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: readmeApi
  url: ../openapi/readme-openapi.yml
  type: openapi
workflows:
- workflowId: upsert-changelog-post
  summary: Update a changelog post if its slug exists, otherwise create it.
  description: >-
    Lists changelog posts on the branch, looks for one whose slug matches the
    target, and branches to update the existing post or create a new one.
  inputs:
    type: object
    required:
    - branch
    - slug
    - title
    - body
    - type
    properties:
      branch:
        type: string
        description: The branch (version) the changelog post lives on.
      slug:
        type: string
        description: The slug of the changelog post to upsert.
      title:
        type: string
        description: The changelog post title to write.
      body:
        type: string
        description: The Markdown body to write.
      type:
        type: string
        description: The change type (added | fixed | improved | deprecated | removed).
      apiKey:
        type: string
        description: ReadMe API key used as a Bearer token.
  steps:
  - stepId: listChangelogs
    description: List changelog posts on the branch to detect whether the target slug exists.
    operationPath: '{$sourceDescriptions.readmeApi.url}#/paths/~1branches~1{branch}~1changelogs/get'
    parameters:
    - name: branch
      in: path
      value: $inputs.branch
    - name: Authorization
      in: header
      value: "Bearer $inputs.apiKey"
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      changelogs: $response.body
    onSuccess:
    - name: postExists
      type: goto
      stepId: updateChangelog
      criteria:
      - context: $response.body
        condition: $[?(@.slug == $inputs.slug)]
        type: jsonpath
    - name: postMissing
      type: goto
      stepId: createChangelog
      criteria:
      - context: $response.body
        condition: $[?(@.slug == $inputs.slug)].length == 0
        type: jsonpath
  - stepId: updateChangelog
    description: Update the existing changelog post identified by slug.
    operationPath: '{$sourceDescriptions.readmeApi.url}#/paths/~1branches~1{branch}~1changelogs~1{slug}/put'
    parameters:
    - name: branch
      in: path
      value: $inputs.branch
    - name: slug
      in: path
      value: $inputs.slug
    - name: Authorization
      in: header
      value: "Bearer $inputs.apiKey"
    requestBody:
      contentType: application/json
      payload:
        title: $inputs.title
        body: $inputs.body
        type: $inputs.type
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      slug: $response.body#/slug
    onSuccess:
    - name: done
      type: end
  - stepId: createChangelog
    description: Create a new changelog post when no post with the target slug exists.
    operationPath: '{$sourceDescriptions.readmeApi.url}#/paths/~1branches~1{branch}~1changelogs/post'
    parameters:
    - name: branch
      in: path
      value: $inputs.branch
    - name: Authorization
      in: header
      value: "Bearer $inputs.apiKey"
    requestBody:
      contentType: application/json
      payload:
        title: $inputs.title
        body: $inputs.body
        type: $inputs.type
    successCriteria:
    - condition: $statusCode == 201
    outputs:
      slug: $response.body#/slug
  outputs:
    updatedSlug: $steps.updateChangelog.outputs.slug
    createdSlug: $steps.createChangelog.outputs.slug