backend-pr-labeler.yml

name: Backend PR Labeler
on:
  pull_request:
    types: [opened, reopened, review_requested, review_request_removed, ready_for_review, converted_to_draft, labeled, unlabeled]
  pull_request_review:
    types: [submitted]
  workflow_run:
    workflows: 
      - "Code Checks"
    types: [completed]
jobs:
  get-pr-data:
    runs-on: ubuntu-latest
    env:
      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
    outputs:
      pr_number: ${{ steps.get_pr_data.outputs.pr_number }}
      pr_draft: ${{ steps.get_pr_data.outputs.pr_draft }}
      pr_labels: ${{ steps.get_pr_data.outputs.pr_labels }}
      pr_requested_teams: ${{ steps.get_pr_data.outputs.pr_requested_teams }}
    steps:
      - name: Get pull_request data
        id: get_pr_data
        run: |
          if ${{ github.event_name == 'pull_request' || github.event_name == 'pull_request_review'}}; then
            echo "pr_number=${{ github.event.pull_request.number }}" >> $GITHUB_OUTPUT
            echo "pr_draft=${{ github.event.pull_request.draft }}" >> $GITHUB_OUTPUT
            echo "pr_labels=$(echo '${{ toJSON(github.event.pull_request.labels.*.name) }}' | jq -c '.')" >> $GITHUB_OUTPUT
            echo "pr_requested_teams=$(echo '${{ toJSON(github.event.pull_request.requested_teams.*.name) }}' | jq -c '.')" >> $GITHUB_OUTPUT
          elif ${{ github.event_name == 'workflow_run' }}; then
            if ${{ github.event.workflow_run.event == 'push' }}; then
              echo "Workflow was triggered by push to ${{ github.event.workflow_run.head_branch }}. Labeling not required."
              exit 0
            elif ${{ toJSON(github.event.workflow_run.pull_requests) != '[]' }}; then
              PR_NUMBER="${{ github.event.workflow_run.pull_requests[0].number }}"
              echo "pr_number=${PR_NUMBER}" >> $GITHUB_OUTPUT
            
              # Fetch PR details from GitHub API
              PR_INFO=$(gh api /repos/${{ github.repository }}/pulls/${PR_NUMBER} --jq '{
                draft: .draft,
                labels: [.labels[].name],
                requested_teams: [.requested_teams[].slug]
              }')
              
              # Extract and store individual fields
              echo "pr_draft=$(echo "$PR_INFO" | jq -r '.draft')" >> $GITHUB_OUTPUT
              echo "pr_labels=$(echo "$PR_INFO" | jq -c '.labels')" >> $GITHUB_OUTPUT
              echo "pr_requested_teams=$(echo "$PR_INFO" | jq -c '.requested_teams')" >> $GITHUB_OUTPUT
            else
              echo "Workflow run has no associated pull requests. Labeling not performed."
              exit 0
            fi
          else
            echo "event_name: ${{ github.event_name }}"
            echo "Pull Request not successfully retrieved."
            exit 1
          fi

      - name: Echo PR data
        if: ${{ steps.get_pr_data.outputs.pr_number != '' }}
        run: |
          echo "pr_number: ${{ steps.get_pr_data.outputs.pr_number }}"
          echo "pr_draft: ${{ steps.get_pr_data.outputs.pr_draft }}"
          echo "pr_labels: ${{ steps.get_pr_data.outputs.pr_labels }}"
          echo "pr_labels: ${{ fromJson(steps.get_pr_data.outputs.pr_labels)[0] }}"
          echo "pr_requested_teams: ${{ steps.get_pr_data.outputs.pr_requested_teams }}"
          echo "pr_requested_teams: ${{ fromJSON(steps.get_pr_data.outputs.pr_requested_teams)[0] }}"

  check-pr-status:
    runs-on: ubuntu-latest
    needs: get-pr-data
    if: ${{ needs.get-pr-data.outputs.pr_number != '' }}
    env:
      pr_labels: ${{ needs.get-pr-data.outputs.pr_labels }}
      pr_requested_teams: ${{ needs.get-pr-data.outputs.pr_requested_teams }}
    outputs:
      test_status: ${{ steps.get_code_checks_conclusion.outputs.test_status }}
      exempt: ${{ steps.check_exemption.outputs.exempt }}
      failures_detected: ${{ steps.audit_pr_labels.outputs.failures_detected }}
    steps:
      - name: Print vars (DELETE ME)
        run: |
          echo "pr_labels=${{ needs.get-pr-data.outputs.pr_labels }}"
          echo "pr_requested_teams=${{ needs.get-pr-data.outputs.pr_requested_teams }}"

      - name: Get Code Checks result
        if: github.event_name == 'workflow_run'
        run: |
          echo "test_status=${{ github.event.workflow_run.conclusion }}" >> $GITHUB_OUTPUT
          echo "test_status: ${{ github.event.workflow_run.conclusion }}"

      - name: Check for exemption
        id: check_exemption
        run: |
          if ${{ contains(fromJSON(env.pr_requested_teams), 'backend-review-group') }}; then
            echo "exempt=false" >> $GITHUB_OUTPUT
            echo "PR requires backend approval."
          else
            echo "exempt=true" >> $GITHUB_OUTPUT
            echo "PR is exempt from backend approval."
          fi

      - name: Check for failure labels
        id: audit_pr_labels
        run: |
          if \
            ${{ contains(env.pr_labels, 'code-health-failure') }} || \
            ${{ contains(env.pr_labels, 'codeowners-addition-failure') }} || \
            ${{ contains(env.pr_labels, 'codeowners-delete-failure') }} || \
            ${{ contains(env.pr_labels, 'lint-failure') }} || \
            ${{ contains(env.pr_labels, 'test-failure') }} ; then
            echo "failures_detected=true" >> $GITHUB_OUTPUT
            echo "Failure labels detected."
          else
            echo "failures_detected=false" >> $GITHUB_OUTPUT
            echo "No failure labels detected."
          fi

  check-approvals:
    runs-on: ubuntu-latest
    needs: [get-pr-data, check-pr-status]
    if: ${{ needs.check-pr-status.outputs.exempt == 'false' && needs.check-pr-status.outputs.pr_draft == 'false' }}
    env:
      pr_number: ${{ needs.get-pr-data.outputs.pr_number }}
    outputs:
      approval_status: ${{ steps.verify_approval.outputs.approval_status }}
    steps:
      - name: Print vars (DELETE ME)
        run: |
          echo "pr_number=${{ env.pr_number }}"

      - name: Configure AWS Credentials
        uses: aws-actions/configure-aws-credentials@v4.0.2
        with:
          aws-access-key-id: ${{ secrets.aws_access_key_id }}
          aws-secret-access-key: ${{ secrets.aws_secret_access_key }}
          aws-region: "us-gov-west-1"

      - name: Get bot token from Parameter Store
        uses: marvinpinto/action-inject-ssm-secrets@latest
        with:
          ssm_parameter: /devops/VA_VSP_BOT_GITHUB_TOKEN
          env_variable_name: VA_VSP_BOT_GITHUB_TOKEN

      - name: Get PR Reviews
        id: get_pr_reviews
        uses: octokit/request-action@v2.x
        with:
          route: GET /repos/${{ github.repository }}/pulls/${{ env.pr_number }}/reviews
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Get backend-review-group members
        id: get_team_members
        uses: octokit/request-action@v2.x
        with:
          route: GET /orgs/department-of-veterans-affairs/teams/backend-review-group/members
        env:
          GITHUB_TOKEN: ${{ env.VA_VSP_BOT_GITHUB_TOKEN }}

      # Confirm an approval exists from at least one BE team member
      - name: Verify backend-review-group approval
        id: verify_approval
        run: |
          BACKEND_REVIEWERS=$(cat <<'EOF' | jq -r '.[].login' | tr '\n' '|' | sed 's/|$//'
          ${{ steps.get_team_members.outputs.data }}
          EOF
          )

          APPROVALS=$(cat <<'EOF' | jq -r '.[] | select(.state == "APPROVED") | .user.login' | grep -iE "$BACKEND_REVIEWERS" | wc -l
          ${{ steps.get_pr_reviews.outputs.data }}
          EOF
          )

          echo "Number of backend-review-group approvals: $APPROVALS"
          if [ "$APPROVALS" -eq 0 ]; then
            echo "approval_status=required" >> $GITHUB_OUTPUT
            echo "Backend-review-group approval required."
          else
            echo "approval_status=confirmed" >> $GITHUB_OUTPUT
            echo "Backend-review-group approval confirmed."
          fi

  apply-labels:
    runs-on: ubuntu-latest
    needs: [get-pr-data, check-pr-status, check-approvals]
    if: ${{ always() }}
    env:
      exempt: ${{ needs.check-pr-status.outputs.exempt }}
      pr_number: ${{ needs.get-pr-data.outputs.pr_number }}
      pr_draft: ${{ needs.get-pr-data.outputs.pr_draft }}
      pr_labels: ${{ needs.get-pr-data.outputs.pr_labels }}
      test_status: ${{ needs.check-pr-status.outputs.test_status }}
      failures_detected: ${{ needs.check-pr-status.outputs.failures_detected }}
      approval_status: ${{ needs.check-approvals.outputs.approval_status }}
    steps:
      - name: print vars (DELETE ME)
        id: print-vars
        run: |
          echo ${{ env.exempt }}
          echo ${{ env.pr_number }}
          echo ${{ env.pr_draft }}
          echo ${{ env.pr_labels }}
          echo ${{ env.test_status }}
          echo ${{ env.failures_detected }}
          echo ${{ env.approval_status }}