name: Artifacts

on:
  workflow_call:
    inputs:
      publish:
        description: Publish artifacts to the artifact store
        default: false
        required: false
        type: boolean
    secrets:
      DOCKER_USERNAME:
        required: true
      DOCKER_PASSWORD:
        required: true
    outputs:
      container-image-name:
        description: Container image name
        value: ${{ jobs.container-image.outputs.name }}
      container-image-digest:
        description: Container image digest
        value: ${{ jobs.container-image.outputs.digest }}
      container-image-ref:
        description: Container image ref
        value: ${{ jobs.container-image.outputs.ref }}

permissions:
  contents: read

jobs:
  container-image:
    name: Container image
    runs-on: ubuntu-latest

    strategy:
      matrix:
        variant:
          - alpine
          - distroless

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

    outputs:
      name: ${{ steps.image-name.outputs.value }}
      digest: ${{ steps.build.outputs.digest }}
      ref: ${{ steps.image-ref.outputs.value }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2

      - name: Set up QEMU
        uses: docker/setup-qemu-action@2b82ce82d56a2a04d2637cd93a637ae1b359c0a7 # v2.2.0

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@4b4e9c3e2d4531116a6f8ba8e71fc6e2cb6e6c8c # v2.5.0

      - name: Set up Syft
        uses: anchore/sbom-action/download-syft@4d571ad1038a9cc29d676154ef265ab8f9027042 # v0.14.2

      - name: Set image name
        id: image-name
        run: echo "value=ghcr.io/${{ github.repository }}" >> "$GITHUB_OUTPUT"

      - name: Gather build metadata
        id: meta
        uses: docker/metadata-action@c4ee3adeed93b1fa6a762f209fb01608c1a22f1e # v4.4.0
        with:
          images: |
            ${{ steps.image-name.outputs.value }}
            dexidp/dex
          flavor: |
            latest = false
          tags: |
            type=ref,event=branch,enable=${{ matrix.variant == 'alpine' }}
            type=ref,event=pr,prefix=pr-,enable=${{ matrix.variant == 'alpine' }}
            type=semver,pattern={{raw}},enable=${{ matrix.variant == 'alpine' }}
            type=raw,value=latest,enable=${{ github.ref_name == github.event.repository.default_branch && matrix.variant == 'alpine' }}
            type=ref,event=branch,suffix=-${{ matrix.variant }}
            type=ref,event=pr,prefix=pr-,suffix=-${{ matrix.variant }}
            type=semver,pattern={{raw}},suffix=-${{ matrix.variant }}
            type=raw,value=latest,enable={{is_default_branch}},suffix=-${{ matrix.variant }}
          labels: |
            org.opencontainers.image.documentation=https://dexidp.io/docs/

      # Multiple exporters are not supported yet
      # See https://github.com/moby/buildkit/pull/2760
      - name: Determine build output
        uses: haya14busa/action-cond@1d6e8a12b20cdb4f1954feef9aa475b9c390cab5 # v1.1.1
        id: build-output
        with:
          cond: ${{ inputs.publish }}
          if_true: type=image,push=true
          if_false: type=oci,dest=image.tar

      - name: Login to GitHub Container Registry
        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc # v2.2.0
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ github.token }}
        if: inputs.publish

      - name: Login to Docker Hub
        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc # v2.2.0
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
        if: inputs.publish

      - name: Build and push image
        id: build
        uses: docker/build-push-action@3b5e8027fcad23fda98b2e3ac259d8d67585f671 # v4.0.0
        with:
          context: .
          platforms: linux/amd64,linux/arm/v7,linux/arm64,linux/ppc64le
          tags: ${{ steps.meta.outputs.tags }}
          build-args: |
            BASE_IMAGE=${{ matrix.variant }}
            VERSION=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.version'] }}
            COMMIT_HASH=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.revision'] }}
            BUILD_DATE=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.created'] }}
          labels: ${{ steps.meta.outputs.labels }}
          # cache-from: type=gha
          # cache-to: type=gha,mode=max
          outputs: ${{ steps.build-output.outputs.value }}
          # push: ${{ inputs.publish }}

      - name: Set image ref
        id: image-ref
        run: echo "value=${{ steps.image-name.outputs.value }}@${{ steps.build.outputs.digest }}" >> "$GITHUB_OUTPUT"

      - name: Fetch image
        run: skopeo --insecure-policy copy docker://${{ steps.image-ref.outputs.value }} oci-archive:image.tar
        if: inputs.publish

      # Uncomment the following lines for debugging:
      # - name: Upload image as artifact
      #   uses: actions/upload-artifact@v3
      #   with:
      #     name: "[${{ github.job }}] OCI tarball"
      #     path: image.tar

      - name: Extract OCI tarball
        run: |
          mkdir -p image
          tar -xf image.tar -C image

      # - name: List tags
      #   run: skopeo --insecure-policy list-tags oci:image
      #
      # # See https://github.com/anchore/syft/issues/1545
      # - name: Extract image from multi-arch image
      #   run: skopeo --override-os linux --override-arch amd64 --insecure-policy copy oci:image:${{ steps.image-name.outputs.value }}:${{ steps.meta.outputs.version }} docker-archive:docker.tar
      #
      # - name: Generate SBOM
      #   run: syft -o spdx-json=sbom-spdx.json docker-archive:docker.tar
      #
      # - name: Upload SBOM as artifact
      #   uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce # v3.1.2
      #   with:
      #     name: "[${{ github.job }}] SBOM"
      #     path: sbom-spdx.json
      #     retention-days: 5

      - name: Run Trivy vulnerability scanner
        uses: aquasecurity/trivy-action@b43daad0c3c96202fc5800b511dfae8e6ecce864 # 0.11.0
        with:
          input: image
          format: sarif
          output: trivy-results.sarif

      - name: Upload Trivy scan results as artifact
        uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce # v3.1.2
        with:
          name: "[${{ github.job }}] Trivy scan results"
          path: trivy-results.sarif
          retention-days: 5

      - name: Upload Trivy scan results to GitHub Security tab
        uses: github/codeql-action/upload-sarif@83f0fe6c4988d98a455712a27f0255212bba9bd4 # v2.3.6
        with:
          sarif_file: trivy-results.sarif