pr-terraform.yaml

on:
  workflow_call:
    inputs:
      role_name:
        required: true
        type: string
      role_session_name:
        required: true
        type: string
      aws_region:
        required: false
        type: string
        default: eu-central-1
      working_directory:
        required: true
        type: string

permissions:
  id-token: write
  contents: read
  pull-requests: write
  statuses: write

jobs:
  terraform:
    name: Terraform
    runs-on: ubuntu-latest
    timeout-minutes: 15

    defaults:
      run:
        working-directory: ${{ inputs.working_directory }}

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

      - name: Configure AWS Credentials
        id: aws
        uses: aws-actions/configure-aws-credentials@v3
        with:
          role-to-assume: arn:aws:iam::${{ secrets.AWS_ACCOUNT_ID }}:role/github-actions-kubernetes-role
          role-session-name: ga-kubernetes
          aws-region:  eu-central-1

      - name: Download Staging Variables
        uses: actions/download-artifact@v4
        with:
          name: staging-variables
          path: ${{ inputs.working_directory }}

      - name: Download Prod Variables
        uses: actions/download-artifact@v4
        with:
          name: prod-variables
          path: ${{ inputs.working_directory }}

      - name: Setup Terraform
        uses: hashicorp/setup-terraform@v2
        with:
          terraform_version: ~1.0

      - name: Terraform Format
        id: fmt
        run: terraform fmt -check

      - name: Terraform Init
        id: init
        run: terraform init

      - name: Terraform Validate
        id: validate
        run: terraform validate -no-color

      - name: Terraform Staging Plan
        id: plan-staging
        run: terraform plan -no-color -var-file=staging.tfvars.json
        env:
          TF_WORKSPACE: stg
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Terraform Prod Plan
        id: plan-prod
        run: terraform plan -no-color -var-file=prod.tfvars.json
        env:
          TF_WORKSPACE: prod
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - uses: actions/github-script@v6
        if: github.event_name == 'pull_request'
        env:
          PLAN_STAGING: "terraform\n${{ steps.plan-staging.outputs.stdout }}"
          PLAN_PROD: "terraform\n${{ steps.plan-prod.outputs.stdout }}"
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            // 1. Retrieve existing bot comments for the PR
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            })
            const botComment = comments.find(comment => {
              return comment.user.type === 'Bot' && comment.body.includes('Terraform Format and Style')
            })

            // 2. Prepare format of the comment
            const output = `#### Terraform Format and Style 🖌\`${{ steps.fmt.outcome }}\`
            #### Terraform Initialization ⚙️\`${{ steps.init.outcome }}\`
            #### Terraform Validation 🤖\`${{ steps.validate.outcome }}\`
            <details><summary>Validation Output</summary>

            \`\`\`\n
            ${{ steps.validate.outputs.stdout }}
            \`\`\`

            </details>

            #### Terraform Staging Plan 📖\`${{ steps.plan-staging.outcome }}\`

            <details><summary>Show Staging Plan</summary>

            \`\`\`\n
            ${process.env.PLAN_STAGING}
            \`\`\`

            </details>

            #### Terraform Prod Plan 📖\`${{ steps.plan-prod.outcome }}\`

            <details><summary>Show Prod Plan</summary>

            \`\`\`\n
            ${process.env.PLAN_PROD}
            \`\`\`

            </details>

            *Pusher: @${{ github.actor }}, Action: \`${{ github.event_name }}\`, Working Directory: \`${{ env.tf_actions_working_dir }}\`, Workflow: \`${{ github.workflow }}\`*`;

            // 3. If we have a comment, update it, otherwise create a new one
            if (botComment) {
              github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: botComment.id,
                body: output
              })
            } else {
              github.rest.issues.createComment({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: output
              })
            }

      - name: Terraform Staging Plan Status
        if: steps.plan-staging.outcome == 'failure'
        run: exit 1

      - name: Terraform Prod Plan Status
        if: steps.plan-prod.outcome == 'failure'
        run: exit 1