WordPress Attach Featured Media to Post

arazzo: 1.0.1
info:
  title: WordPress Attach Featured Media to Post
  summary: Find an image in the media library and publish a post that features it.
  description: >-
    A headless-CMS pattern for giving a post a featured image. Because the
    WordPress REST API surface described here exposes media as read-only
    (list/get, no upload operation), this workflow adapts the "upload then set
    featured" theme into a "find then set featured" flow: it searches the media
    library for an existing image attachment, creates a post that references that
    attachment as its featured_media, and reads the post back to confirm the
    assignment. Each step spells out its request inline, including the application
    password authentication WordPress requires for writes, so the flow can be read
    and executed without opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: mediaApi
  url: ../openapi/wordpress-media-api-openapi.yml
  type: openapi
- name: postsApi
  url: ../openapi/wordpress-posts-api-openapi.yml
  type: openapi
workflows:
- workflowId: attach-featured-media-to-post
  summary: Select an existing image attachment and feature it on a new post.
  description: >-
    Lists image media items, branches on whether any exist, and when one is found
    creates a published post whose featured_media is set to that attachment id,
    then reads the post back to verify.
  inputs:
    type: object
    required:
    - authorization
    - postTitle
    - postContent
    properties:
      authorization:
        type: string
        description: >-
          HTTP Basic Authorization header value built from a WordPress
          Application Password (e.g. "Basic dXNlcjpwYXNzd29yZA==").
      postTitle:
        type: string
        description: The title for the new post.
      postContent:
        type: string
        description: The HTML content body for the new post.
  steps:
  - stepId: findImage
    description: >-
      List image attachments from the media library, returning the most recent
      single image to use as the featured media.
    operationId: listMedia
    parameters:
    - name: media_type
      in: query
      value: image
    - name: per_page
      in: query
      value: 1
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      mediaId: $response.body#/0/id
      sourceUrl: $response.body#/0/source_url
    onSuccess:
    - name: imageFound
      type: goto
      stepId: createPostWithFeatured
      criteria:
      - context: $response.body
        condition: $.length > 0
        type: jsonpath
    - name: noImage
      type: end
      criteria:
      - context: $response.body
        condition: $.length == 0
        type: jsonpath
  - stepId: createPostWithFeatured
    description: >-
      Create a published post and set its featured_media to the image attachment
      found in the media library.
    operationId: createPost
    parameters:
    - name: Authorization
      in: header
      value: $inputs.authorization
    requestBody:
      contentType: application/json
      payload:
        title: $inputs.postTitle
        content: $inputs.postContent
        status: publish
        featured_media: $steps.findImage.outputs.mediaId
    successCriteria:
    - condition: $statusCode == 201
    outputs:
      postId: $response.body#/id
  - stepId: verifyPost
    description: >-
      Read the post back by id to confirm it was created with the featured image
      assigned.
    operationId: getPost
    parameters:
    - name: id
      in: path
      value: $steps.createPostWithFeatured.outputs.postId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      postId: $response.body#/id
      featuredMedia: $response.body#/featured_media
  outputs:
    mediaId: $steps.findImage.outputs.mediaId
    postId: $steps.verifyPost.outputs.postId
    featuredMedia: $steps.verifyPost.outputs.featuredMedia