close-preview.yml

name: Close preview environment
on:
  workflow_dispatch:
    inputs:
      pr:
        required: true
        type: string
        description: PR number
  pull_request_target:
    types: [closed]

permissions:
  id-token: write

jobs:
  close:
    runs-on: ubuntu-latest
    if: github.repository == 'microsoft/TypeScript-Website'
    environment:
      name: azure-preview
      deployment: false
    env:
      AZURE_STATIC_WEB_APP_NAME: ${{ vars.AZURE_STATIC_WEB_APP_NAME }}
      AZURE_RESOURCE_GROUP: ${{ vars.AZURE_RESOURCE_GROUP }}
    steps:
      - name: Log in to Azure
        uses: azure/login@a641126d1b8aa4d1fa005f4f92df94a3a4c4c906 # v3.1.0
        with:
          client-id: ${{ vars.AZURE_CLIENT_ID }}
          tenant-id: ${{ vars.AZURE_TENANT_ID }}
          subscription-id: ${{ vars.AZURE_SUBSCRIPTION_ID }}

      - name: Close preview environment
        env:
          PR_NUMBER: ${{ inputs.pr || github.event.pull_request.number }}
        run: |
          set -euo pipefail
          : "${AZURE_STATIC_WEB_APP_NAME:?Missing AZURE_STATIC_WEB_APP_NAME environment variable}"
          : "${AZURE_RESOURCE_GROUP:?Missing AZURE_RESOURCE_GROUP environment variable}"
          if [[ ! "$PR_NUMBER" =~ ^[1-9][0-9]*$ ]]; then
            echo "::error::Invalid preview PR number"
            exit 1
          fi

          get_preview_environment() {
            az staticwebapp environment list \
              --name "$AZURE_STATIC_WEB_APP_NAME" \
              --resource-group "$AZURE_RESOURCE_GROUP" \
              --query "[?name=='$PR_NUMBER'].name" --output tsv
          }

          environment="$(get_preview_environment)"
          if [[ -z "$environment" ]]; then
            echo "No preview environment exists for PR $PR_NUMBER"
            exit 0
          fi

          # Avoid Azure CLI's subscription-scoped long-running-operation polling.
          resource_id="/subscriptions/{subscriptionId}/resourceGroups/$AZURE_RESOURCE_GROUP"
          resource_id+="/providers/Microsoft.Web/staticSites/$AZURE_STATIC_WEB_APP_NAME"
          az rest --method delete --url "$resource_id/builds/$PR_NUMBER?api-version=2024-11-01"

          for _ in {1..30}; do
            environment="$(get_preview_environment)"
            if [[ -z "$environment" ]]; then
              echo "Deleted preview environment for PR $PR_NUMBER"
              exit 0
            fi
            sleep 5
          done

          echo "::error::Timed out waiting for preview $PR_NUMBER to be deleted"
          exit 1