name: Check for new upstream release

on:
  schedule:
    - cron: '0 6 * * *'

permissions:
  contents: read
  packages: write
  security-events: write

env:
  IMAGE: ghcr.io/${{ github.repository_owner }}/protonmail-bridge

jobs:
  check:
    runs-on: ubuntu-latest
    outputs:
      version: ${{ steps.check.outputs.version }}
      needed: ${{ steps.check.outputs.needed }}
    steps:
      - name: Compare upstream to registry
        id: check
        run: |
          version=$(curl -s https://api.github.com/repos/ProtonMail/proton-bridge/releases/latest | jq -r '.tag_name')
          echo "version=$version" >> $GITHUB_OUTPUT

          token=$(curl -s "https://ghcr.io/token?scope=repository:${{ github.repository_owner }}/protonmail-bridge:pull" | jq -r '.token')
          exists=$(curl -s -o /dev/null -w '%{http_code}' \
            -H "Authorization: Bearer $token" \
            "https://ghcr.io/v2/${{ github.repository_owner }}/protonmail-bridge/manifests/$version")

          if [ "$exists" = "200" ]; then
            echo "needed=false" >> $GITHUB_OUTPUT
            echo "$version already exists in registry"
          else
            echo "needed=true" >> $GITHUB_OUTPUT
            echo "New version $version — building"
          fi

  build:
    needs: check
    if: needs.check.outputs.needed == 'true'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: docker/setup-buildx-action@v3

      - uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: ./build
          push: true
          tags: |
            ${{ env.IMAGE }}:latest
            ${{ env.IMAGE }}:${{ needs.check.outputs.version }}
          build-args: |
            version=${{ needs.check.outputs.version }}

      - name: Trivy scan
        uses: aquasecurity/trivy-action@0.30.0
        with:
          image-ref: ${{ env.IMAGE }}:${{ needs.check.outputs.version }}
          format: sarif
          output: trivy-results.sarif
          severity: CRITICAL,HIGH

      - name: Upload Trivy results
        uses: github/codeql-action/upload-sarif@v3
        if: always()
        with:
          sarif_file: trivy-results.sarif