YouTube Channel Playlists and Items

arazzo: 1.0.1
info:
  title: YouTube Channel Playlists and Items
  summary: Resolve a channel, list its playlists, then list the items inside the first playlist.
  description: >-
    Walks a channel's published structure. It looks up a channel by id,
    enumerates the playlists owned by that channel, and then lists the items in
    the first playlist returned. 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: youtubeDataApi
  url: ../openapi/youtube-data-api-openapi.yml
  type: openapi
workflows:
- workflowId: channel-playlists-items
  summary: Drill from a channel into its playlists and the items of the first one.
  description: >-
    Reads a channel resource, lists the playlists created by that channel, and
    expands the first playlist into its constituent playlist items.
  inputs:
    type: object
    required:
    - apiKey
    - channelId
    properties:
      apiKey:
        type: string
        description: The Google API key used to authorize each YouTube Data API request.
      channelId:
        type: string
        description: The YouTube channel id whose playlists should be enumerated.
  steps:
  - stepId: getChannel
    description: Retrieve the channel resource, including snippet and content details.
    operationId: youtube.channels.list
    parameters:
    - name: part
      in: query
      value: snippet,contentDetails,statistics
    - name: id
      in: query
      value: $inputs.channelId
    - name: key
      in: query
      value: $inputs.apiKey
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      channelTitle: $response.body#/items/0/snippet/title
  - stepId: listPlaylists
    description: >-
      List the playlists created by the channel and capture the id of the first
      playlist for further expansion.
    operationId: youtube.playlists.list
    parameters:
    - name: part
      in: query
      value: snippet,contentDetails
    - name: channelId
      in: query
      value: $inputs.channelId
    - name: maxResults
      in: query
      value: 25
    - name: key
      in: query
      value: $inputs.apiKey
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      firstPlaylistId: $response.body#/items/0/id
      playlists: $response.body#/items
  - stepId: listPlaylistItems
    description: List the items contained in the first playlist returned for the channel.
    operationId: youtube.playlistItems.list
    parameters:
    - name: part
      in: query
      value: snippet,contentDetails
    - name: playlistId
      in: query
      value: $steps.listPlaylists.outputs.firstPlaylistId
    - name: maxResults
      in: query
      value: 50
    - name: key
      in: query
      value: $inputs.apiKey
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      items: $response.body#/items
  outputs:
    channelTitle: $steps.getChannel.outputs.channelTitle
    playlists: $steps.listPlaylists.outputs.playlists
    firstPlaylistItems: $steps.listPlaylistItems.outputs.items