Sendbird Add Members to an Existing Channel

arazzo: 1.0.1
info:
  title: Sendbird Add Members to an Existing Channel
  summary: Confirm a channel, recreate it as distinct with an expanded member set, and notify.
  description: >-
    Grows the membership of a distinct group channel. It reads the existing
    channel to confirm it is present, then issues a distinct channel creation
    with the expanded user set — because the channel is distinct, Sendbird maps
    the same member superset onto the existing conversation rather than spawning
    a duplicate — and finally posts an admin notice welcoming the new members.
    This adapts the invite-members theme onto the distinct-channel mechanics the
    spec supports. 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: sendbirdApi
  url: ../openapi/sendbird-platform-openapi.yml
  type: openapi
workflows:
- workflowId: add-members-to-existing-channel
  summary: Expand a distinct channel's members and announce them.
  description: >-
    Confirms the channel, recreates it as distinct with the expanded member set,
    and posts an admin welcome for the new members.
  inputs:
    type: object
    required:
    - apiToken
    - channelUrl
    - memberIds
    - moderatorId
    properties:
      apiToken:
        type: string
        description: Sendbird Api-Token from the dashboard.
      channelUrl:
        type: string
        description: URL of the existing channel to expand.
      memberIds:
        type: array
        description: Full set of user IDs the channel should contain.
        items:
          type: string
      moderatorId:
        type: string
        description: User ID that authors the welcome notice.
      welcomeMessage:
        type: string
        description: Admin notice posted for the new members.
        default: New members have joined the channel.
  steps:
  - stepId: confirmChannel
    description: Confirm the existing channel is present before expanding it.
    operationId: getGroupChannel
    parameters:
    - name: Api-Token
      in: header
      value: $inputs.apiToken
    - name: channel_url
      in: path
      value: $inputs.channelUrl
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      confirmedChannelUrl: $response.body#/channel_url
      name: $response.body#/name
  - stepId: expandMembers
    description: >-
      Recreate the channel as distinct with the expanded member set and the same
      channel URL so the conversation is reused.
    operationId: createGroupChannel
    parameters:
    - name: Api-Token
      in: header
      value: $inputs.apiToken
    requestBody:
      contentType: application/json
      payload:
        channel_url: $steps.confirmChannel.outputs.confirmedChannelUrl
        name: $steps.confirmChannel.outputs.name
        user_ids: $inputs.memberIds
        is_distinct: true
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      channelUrl: $response.body#/channel_url
      memberCount: $response.body#/member_count
  - stepId: welcomeMembers
    description: Post an admin notice welcoming the new members.
    operationId: sendMessage
    parameters:
    - name: Api-Token
      in: header
      value: $inputs.apiToken
    - name: channel_url
      in: path
      value: $steps.expandMembers.outputs.channelUrl
    requestBody:
      contentType: application/json
      payload:
        message_type: ADMM
        user_id: $inputs.moderatorId
        message: $inputs.welcomeMessage
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      noticeId: $response.body#/message_id
  outputs:
    channelUrl: $steps.expandMembers.outputs.channelUrl
    memberCount: $steps.expandMembers.outputs.memberCount
    noticeId: $steps.welcomeMembers.outputs.noticeId