Microsoft Office Provision a Teams Channel and Announce It

arazzo: 1.0.1
info:
  title: Microsoft Office Provision a Teams Channel and Announce It
  summary: Resolve a joined team, check for an existing channel, create it when missing, and post a kickoff message.
  description: >-
    The project-onboarding pattern for Microsoft Teams on Microsoft Graph. The
    workflow confirms the signed-in user's team membership, reads the team,
    lists its channels and branches on whether the target channel already
    exists, creates the channel only when it is missing, and posts a kickoff
    message so the channel is never provisioned empty. 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: teamsApi
  url: ../openapi/microsoft-office-teams-api-openapi.yml
  type: openapi
workflows:
- workflowId: teams-channel-provisioning
  summary: Idempotently create a Teams channel and post its first message.
  description: >-
    Verifies team membership and existence, inspects the channel list to make
    provisioning idempotent, creates the channel when absent, and announces it
    with a kickoff post.
  inputs:
    type: object
    required:
    - teamId
    - channelDisplayName
    - kickoffMessage
    properties:
      teamId:
        type: string
        description: The id of the team to provision the channel in.
      channelDisplayName:
        type: string
        description: Display name of the channel to create if it does not exist.
      channelDescription:
        type: string
        description: Description applied to a newly created channel.
        default: Provisioned by an Arazzo workflow.
      membershipType:
        type: string
        description: Channel membership model.
        enum:
        - standard
        - private
        default: standard
      kickoffMessage:
        type: string
        description: HTML content of the first message posted to the channel.
  steps:
  - stepId: confirmMembership
    description: >-
      List the teams the signed-in user belongs to, confirming the caller has
      standing in the tenant before attempting any team-scoped write.
    operationId: listMyJoinedTeams
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      joinedTeams: $response.body#/value
  - stepId: readTeam
    description: >-
      Read the target team by id to confirm it resolves and to capture its
      display name for the announcement copy.
    operationId: getTeam
    parameters:
    - name: team_id
      in: path
      value: $inputs.teamId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      teamId: $response.body#/id
      teamDisplayName: $response.body#/displayName
  - stepId: listChannels
    description: >-
      List the team's existing channels so provisioning is idempotent: an
      existing channel of the same name is reused rather than duplicated.
    operationId: listTeamChannels
    parameters:
    - name: team_id
      in: path
      value: $inputs.teamId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      channels: $response.body#/value
      firstChannelId: $response.body#/value/0/id
    onSuccess:
    - name: channelMissing
      type: goto
      stepId: createChannel
      criteria:
      - context: $response.body
        condition: $.value[?(@.displayName == '$inputs.channelDisplayName')].length == 0
        type: jsonpath
    - name: channelExists
      type: goto
      stepId: postKickoff
      criteria:
      - context: $response.body
        condition: $.value[?(@.displayName == '$inputs.channelDisplayName')].length > 0
        type: jsonpath
  - stepId: createChannel
    description: >-
      Create the channel in the team, applying the requested membership model.
      Graph answers with the created channel and its id.
    operationId: createTeamChannel
    parameters:
    - name: team_id
      in: path
      value: $inputs.teamId
    requestBody:
      contentType: application/json
      payload:
        displayName: $inputs.channelDisplayName
        description: $inputs.channelDescription
        membershipType: $inputs.membershipType
    successCriteria:
    - condition: $statusCode == 201
    outputs:
      createdChannelId: $response.body#/id
      createdChannelName: $response.body#/displayName
  - stepId: postKickoff
    description: >-
      Post the kickoff message to the channel so members arriving from the
      Teams notification find context rather than an empty conversation.
    operationId: sendChannelMessage
    parameters:
    - name: team_id
      in: path
      value: $inputs.teamId
    - name: channel_id
      in: path
      value: $steps.createChannel.outputs.createdChannelId
    requestBody:
      contentType: application/json
      payload:
        body:
          contentType: html
          content: $inputs.kickoffMessage
    successCriteria:
    - condition: $statusCode == 201
    outputs:
      kickoffMessageId: $response.body#/id
  outputs:
    teamDisplayName: $steps.readTeam.outputs.teamDisplayName
    channelId: $steps.createChannel.outputs.createdChannelId
    kickoffMessageId: $steps.postKickoff.outputs.kickoffMessageId