name: Trivy vulnerability scan
on:
  push:
    branches:
      - main
    paths:
      - "**.tf"
  pull_request:
    paths:
      - "**.tf"
  workflow_dispatch:
  schedule:
    - cron: "0 4 * * *" # Nightly 4AM UTC

# This allows a subsequently queued workflow run to interrupt previous runs
concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id}}
  cancel-in-progress: true

defaults:
  run:
    # fail-fast using bash -eo pipefail. See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#exit-codes-and-error-action-preference
    shell: bash

env:
  AWS_REGION: us-east-2
  AWS_IAM_ROLE: arn:aws:iam::160035666661:role/github-actions-role

permissions:
  contents: read

jobs:
  trivy:
    permissions:
      id-token: write # for aws-actions/configure-aws-credentials
      contents: read # for actions/checkout to fetch code
      security-events: write # for github/codeql-action/upload-sarif to upload SARIF results
    name: Trivy sarif report
    runs-on: ubuntu-latest

    steps:
      - name: Harden Runner
        uses: step-security/harden-runner@63c24ba6bd7ba022e95695ff85de572c04a18142 # v2.7.0
        with:
          egress-policy: audit

      - name: Checkout code
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

      - uses: aws-actions/configure-aws-credentials@e3dd6a429d7300a6a4c196c26e071d42e0343502 # v4.0.2
        with:
          role-to-assume: ${{env.AWS_IAM_ROLE}}
          aws-region: ${{ env.AWS_REGION }}

      - name: Run Trivy vulnerability scanner in repo mode
        uses: aquasecurity/trivy-action@062f2592684a31eb3aa050cc61e7ca1451cecd3d # 0.18.0
        env:
          TRIVY_DB_REPOSITORY: public.ecr.aws/aquasecurity/trivy-db
          TRIVY_JAVA_DB_REPOSITORY: public.ecr.aws/aquasecurity/trivy-java-db
        with:
          scan-type: "fs"
          ignore-unfixed: false
          format: "sarif"
          output: "trivy-results.sarif"
          severity: "CRITICAL,HIGH,MEDIUM,LOW"
          trivyignores: ".trivyignore"

      - name: Upload Trivy scan results to GitHub Security tab
        uses: github/codeql-action/upload-sarif@8a470fddafa5cbb6266ee11b37ef4d8aae19c571 # v3.24.6
        with:
          sarif_file: "trivy-results.sarif"