# This workflow will deploy source code on Cloud Run when a commit is pushed to the $default-branch branch
#
# Overview:
#
# 1. Authenticate to Google Cloud
# 2. Deploy it to Cloud Run
#
# To configure this workflow:
#
# 1. Ensure the required Google Cloud APIs are enabled:
#
#    Cloud Run            run.googleapis.com
#    Cloud Build          cloudbuild.googleapis.com
#    Artifact Registry    artifactregistry.googleapis.com
#
# 2. Create and configure Workload Identity Federation for GitHub (https://github.com/google-github-actions/auth#setting-up-workload-identity-federation)
#
# 3. Ensure the required IAM permissions are granted
#
#    Cloud Run
#      roles/run.admin
#      roles/iam.serviceAccountUser     (to act as the Cloud Run runtime service account)
#
#    Cloud Build
#      roles/cloudbuild.builds.editor
#
#    Cloud Storage
#      roles/storage.objectAdmin
#
#    Artifact Registry
#      roles/artifactregistry.admin     (project or repository level)
#
#    NOTE: You should always follow the principle of least privilege when assigning IAM roles
#
# 4. Create GitHub secrets for WIF_PROVIDER and WIF_SERVICE_ACCOUNT
#
# 5. Change the values for the SERVICE and REGION environment variables (below).
#
# For more support on how to run this workflow, please visit https://github.com/marketplace/actions/deploy-to-cloud-run
#
# Further reading:
#   Cloud Run runtime service account   - https://cloud.google.com/run/docs/securing/service-identity
#   Cloud Run IAM permissions           - https://cloud.google.com/run/docs/deploying-source-code#permissions_required_to_deploy
#   Cloud Run builds from source        - https://cloud.google.com/run/docs/deploying-source-code
#   Principle of least privilege        - https://cloud.google.com/blog/products/identity-security/dont-get-pwned-practicing-the-principle-of-least-privilege

name: Deploy to Cloud Run from Source

on:
  push:
    branches: [ $default-branch ]

env:
  PROJECT_ID: YOUR_PROJECT_ID # TODO: update Google Cloud project id
  SERVICE: YOUR_SERVICE_NAME # TODO: update Cloud Run service name
  REGION: YOUR_SERVICE_REGION # TODO: update Cloud Run service region

jobs:
  deploy:
    # Add 'id-token' with the intended permissions for workload identity federation
    permissions:
      contents: 'read'
      id-token: 'write'

    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Google Auth
        id: auth
        uses: 'google-github-actions/auth@v0'
        with:
          workload_identity_provider: '${{ secrets.WIF_PROVIDER }}' # e.g. - projects/123456789/locations/global/workloadIdentityPools/my-pool/providers/my-provider
          service_account: '${{ secrets.WIF_SERVICE_ACCOUNT }}' # e.g. - my-service-account@my-project.iam.gserviceaccount.com

      # NOTE: Alternative option - authentication via credentials json
      # - name: Google Auth
      #   id: auth
      #   uses: 'google-github-actions/auth@v0'
      #   with:
      #     credentials_json: '${{ secrets.GCP_CREDENTIALS }}'

      - name: Deploy to Cloud Run
        id: deploy
        uses: google-github-actions/deploy-cloudrun@v0
        with:
          service: ${{ env.SERVICE }}
          region: ${{ env.REGION }}
          # NOTE: If required, update to the appropriate source folder
          source: ./

      # If required, use the Cloud Run url output in later steps
      - name: Show Output
        run: echo ${{ steps.deploy.outputs.url }}
