name: Build

on:
  workflow_dispatch:
  push:
    branches:
      - main
    # Ignore Markdown files
    paths-ignore:
      - '**.md'
  schedule:
    # Build the image regularly (each Saturday)
    - cron: '0 22 * * 6'

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: tommytran732/synapse

jobs:
  build:
    name: Build & push new image
    runs-on: "ubuntu-latest"
    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      - name: Extract version for tags
        run: |
          echo "FULL_VERSION=$(grep -oP '(?<=SYNAPSE_VERSION=).*' Dockerfile | head -c6)" >> $GITHUB_ENV
          echo "MAJOR_VERSION=$(grep -oP '(?<=SYNAPSE_VERSION=).*' Dockerfile | head -c4)" >> $GITHUB_ENV

      - name: Install cosign
        if: github.event_name != 'pull_request'
        uses: sigstore/cosign-installer@main

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Login to registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set Docker metadata
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            latest
            ${{ env.FULL_VERSION }}
            ${{ env.MAJOR_VERSION }}

      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@v3
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}

      - name: Sign the published Docker image
        if: ${{ github.event_name != 'pull_request' }}
        run: cosign sign ${TAGS} -y
        env:
          COSIGN_EXPERIMENTAL: "true"
          TAGS: ${{ steps.meta.outputs.tags }}

  scan:
    name: Scan current image & report results
    needs: build
    runs-on: "ubuntu-latest"
    steps:
      - name: Run Trivy vulnerability scanner
        uses: aquasecurity/trivy-action@master
        with:
          image-ref: 'ghcr.io/tommytran732/synapse'
          format: 'template'
          template: '@/contrib/sarif.tpl'
          output: 'trivy-results.sarif'
          severity: 'CRITICAL,HIGH'
          vuln-type: "os"

      - name: Upload Trivy scan results to GitHub Security tab
        uses: github/codeql-action/upload-sarif@v2
        with:
          sarif_file: 'trivy-results.sarif'