---
name: Reusable workflow to build container images

on:
  workflow_call:
    inputs:
      version:
        description: The version of Fluent Bit to create.
        type: string
        required: true
      ref:
        description: The commit, tag or branch of Fluent Bit to checkout for building that creates the version above.
        type: string
        required: true
      registry:
        description: The registry to push container images to.
        type: string
        required: true
      username:
        description: The username for the registry.
        type: string
        required: true
      image:
        description: The name of the container image to push to the registry.
        type: string
        required: true
      environment:
        description: The Github environment to run this workflow on.
        type: string
        required: false
      unstable:
        description: Optionally add metadata to build to indicate an unstable build, set to the contents you want to add.
        type: string
        required: false
        default: ""
    secrets:
      token:
        description: The Github token or similar to authenticate with for the registry.
        required: true
      cosign_private_key:
        description: The optional Cosign key to use for signing the images.
        required: false
      cosign_private_key_password:
        description: If the Cosign key requires a password then specify here, otherwise not required.
        required: false
jobs:
  call-build-images-meta:
    name: Extract any supporting metadata
    outputs:
      major-version: ${{ steps.determine-major-version.outputs.replaced }}
    runs-on: ubuntu-latest
    environment: ${{ inputs.environment }}
    permissions:
      contents: read
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          ref: ${{ inputs.ref }}

      # For main branch/releases we want to tag with the major version.
      # E.g. if we build version 1.9.2 we want to tag with 1.9.2 and 1.9.
      - name: Determine major version tag
        id: determine-major-version
        uses: frabert/replace-string-action@v2.4
        with:
          pattern: '^(\d+\.\d+).*$'
          string: ${{ inputs.version }}
          replace-with: "$1"
          flags: "g"

  # This is the intended approach to multi-arch image and all the other checks scanning,
  # signing, etc only trigger from this.
  call-build-images:
    needs:
      - call-build-images-meta
    name: Multiarch container images to GHCR
    runs-on: ubuntu-latest
    environment: ${{ inputs.environment }}
    permissions:
      contents: read
      packages: write
    outputs:
      production-digest: ${{ steps.build_push.outputs.digest }}
      debug-digest: ${{ steps.debug_build_push.outputs.digest }}
    steps:
      - name: Checkout code for modern style builds
        uses: actions/checkout@v4
        with:
          ref: ${{ inputs.ref }}

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to the Container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ inputs.registry }}
          username: ${{ inputs.username }}
          password: ${{ secrets.token }}

      - name: Extract metadata from Github
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ inputs.registry }}/${{ inputs.image }}
          tags: |
            raw,${{ inputs.version }}
            raw,${{ needs.call-build-images-meta.outputs.major-version }}
            raw,latest

      - name: Build the production images
        id: build_push
        uses: docker/build-push-action@v5
        with:
          file: ./dockerfiles/Dockerfile
          context: .
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          platforms: linux/amd64, linux/arm64, linux/arm/v7
          target: production
          # Must be disabled to provide legacy format images from the registry
          provenance: false
          push: true
          load: false
          build-args: |
            FLB_NIGHTLY_BUILD=${{ inputs.unstable }}
            RELEASE_VERSION=${{ inputs.version }}

      - id: debug-meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ inputs.registry }}/${{ inputs.image }}
          tags: |
            raw,${{ inputs.version }}-debug
            raw,${{ needs.call-build-images-meta.outputs.major-version }}-debug
            raw,latest-debug

      - name: Build the debug multi-arch images
        id: debug_build_push
        uses: docker/build-push-action@v5
        with:
          file: ./dockerfiles/Dockerfile
          context: .
          tags: ${{ steps.debug-meta.outputs.tags }}
          labels: ${{ steps.debug-meta.outputs.labels }}
          platforms: linux/amd64, linux/arm64, linux/arm/v7
          # Must be disabled to provide legacy format images from the registry
          provenance: false
          target: debug
          push: true
          load: false
          build-args: |
            FLB_NIGHTLY_BUILD=${{ inputs.unstable }}
            RELEASE_VERSION=${{ inputs.version }}

  call-build-images-generate-schema:
    needs:
      - call-build-images-meta
      - call-build-images
    runs-on: ubuntu-latest
    environment: ${{ inputs.environment }}
    permissions:
      contents: read
      packages: read
    steps:
      - name: Log in to the Container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ inputs.registry }}
          username: ${{ inputs.username }}
          password: ${{ secrets.token }}

      - name: Generate schema
        run: |
          docker run --rm -t ${{ inputs.registry }}/${{ inputs.image }}:${{ inputs.version }} -J > fluent-bit-schema-${{ inputs.version }}.json
          cat fluent-bit-schema-${{ inputs.version }}.json | jq -M > fluent-bit-schema-pretty-${{ inputs.version }}.json
        shell: bash

      - name: Upload the schema
        uses: actions/upload-artifact@v3
        with:
          path: ./fluent-bit-schema*.json
          name: fluent-bit-schema-${{ inputs.version }}
          if-no-files-found: error

  call-build-images-scan:
    needs:
      - call-build-images-meta
      - call-build-images
    name: Trivy + Dockle image scan
    runs-on: ubuntu-latest
    environment: ${{ inputs.environment }}
    permissions:
      contents: read
      packages: read
    steps:
      - name: Log in to the Container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ inputs.registry }}
          username: ${{ inputs.username }}
          password: ${{ secrets.token }}

      - name: Trivy - multi-arch
        uses: aquasecurity/trivy-action@master
        with:
          image-ref: "${{ inputs.registry }}/${{ inputs.image }}:${{ inputs.version }}"
          format: "table"
          exit-code: "1"
          ignore-unfixed: true
          vuln-type: "os,library"
          severity: "CRITICAL,HIGH"

      - name: Dockle - multi-arch
        uses: hands-lab/dockle-action@v1
        with:
          image: "${{ inputs.registry }}/${{ inputs.image }}:${{ inputs.version }}"
          exit-code: "1"
          exit-level: WARN

  call-build-images-sign:
    needs:
      - call-build-images-meta
      - call-build-images
    name: Deploy and sign multi-arch container image manifests
    permissions:
      contents: read
      packages: write
      # This is used to complete the identity challenge
      # with sigstore/fulcio when running outside of PRs.
      id-token: write
    runs-on: ubuntu-latest
    environment: ${{ inputs.environment }}
    steps:
      - name: Install cosign
        uses: sigstore/cosign-installer@v2

      - name: Cosign keyless signing using Rektor public transparency log
        # This step uses the identity token to provision an ephemeral certificate
        # against the sigstore community Fulcio instance, and records it to the
        # sigstore community Rekor transparency log.
        #
        # We use recursive signing on the manifest to cover all the images.
        run: |
          cosign sign --recursive \
            -a "repo=${{ github.repository }}" \
            -a "workflow=${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}" \
            -a "ref=${{ github.sha }}" \
            -a "release=${{ inputs.version }}" \
            "${{ inputs.registry }}/${{ inputs.image }}@${{ needs.call-build-images.outputs.production-digest }}" \
            "${{ inputs.registry }}/${{ inputs.image }}@${{ needs.call-build-images.outputs.debug-digest }}"
        shell: bash
        # Ensure we move on to key-based signing as well
        continue-on-error: true
        env:
          COSIGN_EXPERIMENTAL: true

      - name: Cosign with a key
        # Only run if we have a key defined
        if: ${{ env.COSIGN_PRIVATE_KEY }}
        # The key needs to cope with newlines
        run: |
          echo -e "${COSIGN_PRIVATE_KEY}" > /tmp/my_cosign.key
          cosign sign --key /tmp/my_cosign.key --recursive \
            -a "repo=${{ github.repository }}" \
            -a "workflow=${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}" \
            -a "ref=${{ github.sha }}" \
            -a "release=${{ inputs.version }}" \
            "${{ inputs.registry }}/${{ inputs.image }}@${{ needs.call-build-images.outputs.production-digest }}" \
            "${{ inputs.registry }}/${{ inputs.image }}@${{ needs.call-build-images.outputs.debug-digest }}"
          rm -f /tmp/my_cosign.key
        shell: bash
        continue-on-error: true
        env:
          COSIGN_PRIVATE_KEY: ${{ secrets.cosign_private_key }}
          COSIGN_PASSWORD: ${{ secrets.cosign_private_key_password }} # optional

  # This takes a long time...
  call-build-windows-container:
    name: Windows container images
    runs-on: windows-${{ matrix.windows-base-version }}
    environment: ${{ inputs.environment }}
    needs:
      - call-build-images-meta
    strategy:
      fail-fast: true
      matrix:
        windows-base-version:
          - '2019'
          - '2022'
    permissions:
      contents: read
      packages: write
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          ref: ${{ inputs.ref }}

      - name: Log in to the Container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ inputs.registry }}
          username: ${{ inputs.username }}
          password: ${{ secrets.token }}

      - name: Build the production images
        run: |
          docker build -t ${{ inputs.registry }}/${{ inputs.image }}:windows-${{ matrix.windows-base-version }}-${{ inputs.version }} --build-arg FLB_NIGHTLY_BUILD=${{ inputs.unstable }} --build-arg WINDOWS_VERSION=ltsc${{ matrix.windows-base-version }} -f ./dockerfiles/Dockerfile.windows .
          docker push ${{ inputs.registry }}/${{ inputs.image }}:windows-${{ matrix.windows-base-version }}-${{ inputs.version }}

        # We cannot use this action as it requires privileged mode
        # uses: docker/build-push-action@v5
        # with:
        #   file: ./dockerfiles/Dockerfile.windows
        #   context: .
        #   tags: ${{ steps.meta.outputs.tags }}
        #   labels: ${{ steps.meta.outputs.labels }}
        #   platforms: windows/amd64
        #   target: runtime
        #   push: true
        #   load: false
        #   build-args: |
        #     FLB_NIGHTLY_BUILD=${{ inputs.unstable }}
        #     WINDOWS_VERSION=ltsc2019