google-get-clouddns-zone-for-domain.yml

name: "google-get-cloud-dns-zone-name-for-domain-under-management"

on:
  workflow_call:
    inputs:
      domain:
        description: "A domain under management by a Google Cloud DNS zone"
        type: string
        required: true
    secrets:
      GOOGLE_PROJECT_ID:
        required: true
      GOOGLE_SERVICE_ACCOUNT_KEY:
        required: true

    outputs:
      zone_name:
        description: "The Google Cloud DNS Zone name of a domain under management"
        value: ${{ jobs.gcloud-cli.outputs.zone_name }}

jobs:

  gcloud-cli:
    runs-on: ubuntu-22.04
    name: "Fetch hosted zone id by domain with gcloud CLI"

    outputs:
      zone_name: ${{ steps.set_outputs.outputs.result }}

    steps:
    - name: Checkout
      uses: actions/checkout@v4

    - id: 'auth'
      uses: 'google-github-actions/auth@v1'
      with:
        credentials_json: '${{ secrets.GOOGLE_SERVICE_ACCOUNT_KEY }}'

    - name: 'Set up Cloud SDK'
      uses: 'google-github-actions/setup-gcloud@v1'
      with:
        version: "438.0.0"

    - name: Set Outputs
      id: set_outputs
      run: |
        echo "Attempting to dash separate ${{ inputs.domain }}"
        dash_separated_domain=$(echo "${{ inputs.domain }}" | sed 's/\./-/g')
        echo "> Result was: ${dash_separated_domain}"
        echo "Attempting to remove root domain"
        root_domain_stripped=${dash_separated_domain%-*}
        echo "> Result was ${root_domain_stripped}"
        echo "Attempting to construct canonical zone name"
        zone_name=$(echo "${root_domain_stripped}-zone")
        echo "> Result is ${zone_name}"
        echo "Validating there's an existing Google Cloud DNS zone named ${zone_name}"
        gcloud dns managed-zones describe ${zone_name}
        echo "result=${zone_name}" >> $GITHUB_OUTPUT