name: PR Comment Triggered Trivy Scan

on:
  issue_comment:
    types: [created]

jobs:
  trivy_scan:
    if: github.event.issue.pull_request && github.event.comment.body == '/trivy'
    runs-on: ubuntu-latest
    permissions:
      pull-requests: read
    steps:
    - name: Check if comment author is a member of k3s-dev team
      uses: actions/github-script@v7
      with:
        # Catch 404 errors if user is not a member of the organization
        # 302 is expected as the GHA is not a member of the organization
        # Users must be set their membership to public for this to work
        # https://github.com/orgs/k3s-io/people
        script: |
          const org = context.repo.owner;
          const username = context.payload.comment.user.login;
          try {
            const result = await github.rest.orgs.checkMembershipForUser({
              org,
              username,
            });
          } catch (error) {
            core.setFailed(`User ${username} is not an public member of the ${org} organization`);
          }
    - name: Checkout PR code
      uses: actions/checkout@v4
      with:
        ref: refs/pull/${{ github.event.issue.number }}/head

    - name: Build K3s Image
      run: |
        make local
        make package-image
        make tag-image-latest

    - name: Download Rancher's VEX Hub report
      run: curl -fsSO https://raw.githubusercontent.com/rancher/vexhub/refs/heads/main/reports/rancher.openvex.json

    - name: Run Trivy vulnerability scanner
      uses: aquasecurity/trivy-action@0.29.0
      with:
        image-ref: 'rancher/k3s:latest'
        format: 'table'
        severity: "HIGH,CRITICAL"
        output: "trivy-report.txt"
      env:
        TRIVY_VEX: rancher.openvex.json
        TRIVY_SHOW_SUPPRESSED: true
    
    - name: Upload Trivy Report
      uses: actions/upload-artifact@v4
      with:
        name: trivy-report
        path: trivy-report.txt  
        retention-days: 2
        if-no-files-found: error

  trivy_report:
    needs: trivy_scan
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    env:
      GH_TOKEN: ${{ github.token }}
      GH_REPO: ${{ github.repository }}
    steps:
      - name: Download Trivy Report
        uses: actions/download-artifact@v4
        with:
          name: trivy-report
      
      - name: Add Trivy Report to PR
        run: |
          if [ -s trivy-report.txt ] && [ -n "$(grep -v '^\s*$' trivy-report.txt)" ]; then
            echo '```' | cat - trivy-report.txt > temp && mv temp trivy-report.txt
            echo '```' >> trivy-report.txt
            gh issue comment ${{ github.event.issue.number }} -F trivy-report.txt
          else
            echo ':star2: No High or Critical CVEs Found :star2:' > trivy-report.txt
            gh issue comment ${{ github.event.issue.number }} -F trivy-report.txt
          fi
  
  trivy_failure:
    needs: trivy_scan
    runs-on: ubuntu-latest
    if: always() && needs.trivy_scan.result == 'failure'
    permissions:
      pull-requests: write
    env:
      GH_TOKEN: ${{ github.token }}
      GH_REPO: ${{ github.repository }}
    steps:
      - name: Report Failure
        run: |
          gh issue comment ${{ github.event.issue.number }} -b ":x: Trivy scan action failed, check logs :x:"