name: build

on:
  push:
    branches:
      - main
    paths:
      - "src/**"
      - "Dockerfile"
      - "go.mod"
      - "go.sum"
  release:
    types: [published]
  workflow_dispatch:

permissions:
  attestations: write
  contents: read
  id-token: write
  packages: write

jobs:
  build:
    name: build (${{ matrix.platform }})
    runs-on: ${{ matrix.runner }}
    if: github.event_name != 'pull_request'

    strategy:
      fail-fast: false
      matrix:
        include:
          - runner: ubuntu-24.04
            platform: linux/amd64
            arch: x86_64
          - runner: ubuntu-24.04-arm
            platform: linux/arm64
            arch: aarch64
          - runner: ubuntu-24.04-arm
            platform: linux/arm/v7
            arch: armv7

    steps:
      - name: Checkout
        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 #v6.0.1

      - name: Docker meta
        id: docker_meta
        uses: docker/metadata-action@c299e40c65443455700f0fdfc63efafe5b349051 #v5.10.0
        with:
          images: |
            ${{ github.repository }}
            ghcr.io/${{ github.repository }}
          tags: |
            type=edge
            type=ref,event=branch,enable={{is_not_default_branch}}
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}
            type=semver,pattern={{major}}.{{minor}}
        env:
          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index

      - name: Set up QEMU (${{ matrix.platform }})
        if: matrix.platform == 'linux/arm/v7'
        uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130 #v3.7.0
        with:
          platforms: ${{ matrix.platform }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 #v3.11.1

      - name: Login to DockerHub
        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef #v3.6.0
        with:
          username: ${{ vars.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Login to GitHub Container Registry
        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef #v3.6.0
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push (${{ matrix.platform }})
        id: docker_build
        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 #v6.18.0
        with:
          context: .
          platforms: ${{ matrix.platform }}
          outputs: type=image,push-by-digest=true,name-canonical=true,push=true
          annotations: ${{ steps.docker_meta.outputs.annotations }}
          labels: ${{ steps.docker_meta.outputs.labels }}
          tags: |
            ${{ github.repository }}
            ghcr.io/${{ github.repository }}
          cache-from: type=gha,scope=${{ matrix.platform }}
          cache-to: type=gha,scope=${{ matrix.platform }},mode=max
          sbom: true
          build-args: |
            apiVersion=${{ fromJSON(steps.docker_meta.outputs.json).labels['org.opencontainers.image.version'] }}

      - name: Export digest
        run: |
          mkdir -p ${{ runner.temp }}/digests
          digest="${{ steps.docker_build.outputs.digest }}"
          touch "${{ runner.temp }}/digests/${digest#sha256:}"

      - name: Upload digest
        id: upload_digests
        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 #v5.0.0
        with:
          name: digests-${{ matrix.arch }}
          path: ${{ runner.temp }}/digests/*
          if-no-files-found: error
          retention-days: 1

      - name: Attest digest (per-arch)
        uses: actions/attest-build-provenance@977bb373ede98d70efdf65b84cb5f73e068dcc2a #v3.0.0
        with:
          subject-name: digests-${{ matrix.arch }}
          subject-digest: sha256:${{ steps.upload_digests.outputs.artifact-digest }}

  manifest:
    name: build (multi-arch)
    runs-on: ubuntu-latest
    needs:
      - build

    outputs:
      docker_build_digest: ${{ steps.docker_build.outputs.digest }}
      docker_meta_version: ${{ steps.docker_meta.outputs.version }}

    steps:
      - name: Checkout
        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 #v6.0.1

      - name: Docker meta
        id: docker_meta
        uses: docker/metadata-action@c299e40c65443455700f0fdfc63efafe5b349051 #v5.10.0
        with:
          images: |
            ${{ github.repository }}
            ghcr.io/${{ github.repository }}
          tags: |
            type=edge
            type=ref,event=branch,enable={{is_not_default_branch}}
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}
            type=semver,pattern={{major}}.{{minor}}
        env:
          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index

      - name: Download digests
        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 #v7.0.0
        with:
          path: ${{ runner.temp }}/digests
          pattern: digests-*
          merge-multiple: true

      - name: Install Cosign
        uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad #v4.0.0

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 #v3.11.1

      - name: Login to DockerHub
        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef #v3.6.0
        with:
          username: ${{ vars.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Login to GitHub Container Registry
        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef #v3.6.0
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Create manifest list and push
        id: docker_build
        working-directory: ${{ runner.temp }}/digests
        run: |
          # Create the manifest list and push to both registries
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            --annotation "index:org.opencontainers.image.created=${{ fromJSON(steps.docker_meta.outputs.json).labels['org.opencontainers.image.created'] }}" \
            --annotation "index:org.opencontainers.image.description=${{ fromJSON(steps.docker_meta.outputs.json).labels['org.opencontainers.image.description'] }}" \
            --annotation "index:org.opencontainers.image.licenses=${{ fromJSON(steps.docker_meta.outputs.json).labels['org.opencontainers.image.licenses'] }}" \
            --annotation "index:org.opencontainers.image.revision=${{ fromJSON(steps.docker_meta.outputs.json).labels['org.opencontainers.image.revision'] }}" \
            --annotation "index:org.opencontainers.image.source=${{ fromJSON(steps.docker_meta.outputs.json).labels['org.opencontainers.image.source'] }}" \
            --annotation "index:org.opencontainers.image.version=${{ fromJSON(steps.docker_meta.outputs.json).labels['org.opencontainers.image.version'] }}" \
            $(printf '${{ github.repository }}@sha256:%s ' *) \
            $(printf 'ghcr.io/${{ github.repository }}@sha256:%s ' *)

          # Get the digest of the created manifest list
          DIGEST=$(docker buildx imagetools inspect ghcr.io/${{ github.repository }}:${{ steps.docker_meta.outputs.version }} --format '{{ json .Manifest.Digest }}' | jq -r .)
          echo "digest=$DIGEST" >> $GITHUB_OUTPUT

      - name: Attest docker build (DockerHub)
        uses: actions/attest-build-provenance@977bb373ede98d70efdf65b84cb5f73e068dcc2a #v3.0.0
        with:
          subject-name: index.docker.io/${{ github.repository }}
          subject-digest: ${{ steps.docker_build.outputs.digest }}
          push-to-registry: true

      - name: Attest docker build (GitHub Container Registry)
        uses: actions/attest-build-provenance@977bb373ede98d70efdf65b84cb5f73e068dcc2a #v3.0.0
        with:
          subject-name: ghcr.io/${{ github.repository }}
          subject-digest: ${{ steps.docker_build.outputs.digest }}
          push-to-registry: true

      - name: Cosign sign images (GitHub OIDC)
        run: |
          cosign sign --yes \
            ${{ github.repository }}@${{ steps.docker_build.outputs.digest }}

          cosign sign --yes \
            ghcr.io/${{ github.repository }}@${{ steps.docker_build.outputs.digest }}

      - name: Inspect images (GitHub Container Registry)
        run: |
          docker buildx imagetools inspect ghcr.io/${{ github.repository }}:${{ steps.docker_meta.outputs.version }}

          echo "::group::Manifest"
          docker buildx imagetools inspect ghcr.io/${{ github.repository }}:${{ steps.docker_meta.outputs.version }} --format '{{ json .Manifest }}'
          echo "::endgroup::"

          echo "::group::Image (linux/amd64)"
          docker buildx imagetools inspect ghcr.io/${{ github.repository }}:${{ steps.docker_meta.outputs.version }} --format '{{ json (index .Image "linux/amd64") }}'
          echo "::endgroup::"

          echo "::group::Provenance (linux/amd64)"
          docker buildx imagetools inspect ghcr.io/${{ github.repository }}:${{ steps.docker_meta.outputs.version }} --format '{{ json (index .Provenance "linux/amd64") }}'
          echo "::endgroup::"

          echo "::group::SBOM (linux/amd64)"
          docker buildx imagetools inspect ghcr.io/${{ github.repository }}:${{ steps.docker_meta.outputs.version }} --format '{{ json (index .SBOM "linux/amd64") }}'
          echo "::endgroup::"

      - name: Verify cosign signatures
        run: |
          echo "::group::Verify signature (DockerHub)"
          cosign verify --rekor-url https://rekor.sigstore.dev \
            --certificate-identity "https://github.com/${{ github.workflow_ref }}" \
            --certificate-oidc-issuer "https://token.actions.githubusercontent.com" \
            ${{ github.repository }}@${{ steps.docker_build.outputs.digest }}
          echo "::endgroup::"

          echo "::group::Verify signature (GitHub Container Registry)"
          cosign verify --rekor-url https://rekor.sigstore.dev \
            --certificate-identity "https://github.com/${{ github.workflow_ref }}" \
            --certificate-oidc-issuer "https://token.actions.githubusercontent.com" \
            ghcr.io/${{ github.repository }}@${{ steps.docker_build.outputs.digest }}
          echo "::endgroup::"

  dockerhub:
    if: github.event_name == 'release'
    runs-on: ubuntu-latest
    needs:
      - build
      - manifest

    steps:
      - name: Checkout
        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 #v6.0.1

      - name: Docker Hub Description
        uses: peter-evans/dockerhub-description@1b9a80c056b620d92cedb9d9b5a223409c68ddfa #v5.0.0
        with:
          username: ${{ vars.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
          short-description: ${{ github.event.repository.description }}