name: Trivy Scan Trigger

# This workflow is triggered when a pull request is labeled with 'scan-with-trivy'.
# This can only be initiated by a user who is a member of the k3s-io organization and has write permissions.
# It isolates the built of k3s within a unprivileged enviroment. 
# The follow up unprivileged workflow will then use the artifact created here to run the scan
# and report the results back to the PR.

on:
  pull_request:
    types: [labeled]

permissions:
  contents: read

jobs:
  trigger-scan:
    if: github.event.label.name == 'scan-with-trivy'
    runs-on: ubuntu-latest
    steps:
      - name: Verify actor is a member of k3s-io organization and has write permissions
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const org = 'k3s-io';
            const actor = context.actor;
            const { repo, owner } = context.repo; 
            
            try {
              const result = await github.rest.orgs.checkMembershipForUser({
                org,
                username: actor,
              });
            } catch (error) {
              core.setFailed(`User ${actor} is not an public member of the ${org} organization`);
            }

            const { data: { permission } } = await github.rest.repos.getCollaboratorPermissionLevel({
              owner,
              repo,
              username: actor
            });
            
            if (permission !== 'admin' && permission !== 'write') {
              core.setFailed(`User @${actor} does not have write permission. Scan can only be triggered by repository collaborators with write access.`);
            }
      
      - name: Checkout repository
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
      
      - name: Build And Save K3s Image
        run: |
          make local-image
          make tag-image-latest
          docker save -o k3s.tar rancher/k3s:latest

      - name: Create PR context artifact
        env:
          PR_NUM: ${{ github.event.pull_request.number }}
        run: |
          mkdir -p pr-context
          echo "$PR_NUM" > pr-context/pr_number
          mv k3s.tar pr-context/k3s.tar

      - name: Upload PR context artifact
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: pr-context-for-scan
          path: pr-context/
          retention-days: 1