name: Artifacts

on:
  push:
    branches:
      - master
    tags:
      - v[0-9]+.[0-9]+.[0-9]+
  pull_request:

jobs:
  container-images:
    name: Container images
    runs-on: ubuntu-latest
    strategy:
      matrix:
        platform:
          - linux/amd64
          - linux/arm/v7
          - linux/arm64
        variant:
          - alpine
          - distroless
    outputs:
      version: ${{ steps.details.outputs.version }}

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Calculate container image details
        id: details
        env:
          CONTAINER_IMAGES: "ghcr.io/dexidp/dex dexidp/dex"
        run: |
          case $GITHUB_REF in
            refs/tags/*)  VERSION=${GITHUB_REF#refs/tags/};;
            refs/heads/*) VERSION=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's#/+#-#g');;
            refs/pull/*)  VERSION=pr-${{ github.event.number }};;
            *)            VERSION=sha-${GITHUB_SHA::8};;
          esac

          VERSION_SUFFIX=""
          if [[ "${{ matrix.variant }}" != "alpine" ]]; then
            VERSION_SUFFIX="-${{ matrix.variant }}"
          fi

          TAGS=()
          for image in $CONTAINER_IMAGES; do
            TAGS+=("${image}:${VERSION}${VERSION_SUFFIX}")

            if [[ "${{ github.event.repository.default_branch }}" == "$VERSION" ]]; then
              TAGS+=("${image}:latest${VERSION_SUFFIX}")
            fi
          done

          echo ::set-output name=version::${VERSION}
          echo ::set-output name=tags::$(IFS=,; echo "${TAGS[*]}")
          echo ::set-output name=commit_hash::${GITHUB_SHA::8}
          echo ::set-output name=build_date::$(git show -s --format=%cI)

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1
        with:
          platforms: all

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ github.token }}
        if: github.event_name == 'push'

      - name: Login to Docker Hub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
        if: github.event_name == 'push'

      - name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          platforms: ${{ matrix.platform }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          push: ${{ github.event_name == 'push' }}
          tags: ${{ steps.details.outputs.tags }}
          build-args: |
            BASE_IMAGE=${{ matrix.variant }}
            VERSION=${{ steps.details.outputs.version }}
            COMMIT_HASH=${{ steps.details.outputs.commit_hash }}
            BUILD_DATE=${{ steps.details.outputs.build_date }}
          labels: |
            org.opencontainers.image.title=${{ github.event.repository.name }}
            org.opencontainers.image.description=${{ github.event.repository.description }}
            org.opencontainers.image.url=${{ github.event.repository.html_url }}
            org.opencontainers.image.source=${{ github.event.repository.clone_url }}
            org.opencontainers.image.version=${{ steps.details.outputs.version }}
            org.opencontainers.image.created=${{ steps.details.outputs.build_date }}
            org.opencontainers.image.revision=${{ github.sha }}
            org.opencontainers.image.licenses=${{ github.event.repository.license.spdx_id }}
            org.opencontainers.image.documentation=https://dexidp.io/docs/

  container-scan:
    name: Container scan
    runs-on: ubuntu-latest
    needs: container-images
    if: github.event_name == 'push'
    strategy:
      matrix:
        variant:
          - alpine
          - distroless

    steps:
      # Workaround for lack of matrix output support
      - name: Calculate container image details
        id: details
        run: |
          VERSION="${{ needs.container-images.outputs.version }}"

          if [[ "${{ matrix.variant }}" != "alpine" ]]; then
            VERSION="${VERSION}-${{ matrix.variant }}"
          fi

          echo ::set-output name=version::${VERSION}

      - name: Run Trivy vulnerability scanner
        uses: aquasecurity/trivy-action@0.2.4
        with:
          image-ref: "ghcr.io/dexidp/dex:${{ steps.details.outputs.version }}"
          format: "sarif"
          output: "trivy-results.sarif"

      - name: Upload Trivy scan results to GitHub Security tab
        uses: github/codeql-action/upload-sarif@v1
        with:
          sarif_file: "trivy-results.sarif"