release.yml

name: goreleaser

on:
  push:
    tags:
      - "v*"

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: false

permissions: {}

jobs:
  goreleaser:
    outputs:
      hashes: ${{ steps.binary.outputs.hashes }}
    runs-on: ubuntu-latest
    permissions:
      contents: write
      id-token: write # sign archives with cosign
    steps:
      - name: Checkout repository
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          persist-credentials: false
          fetch-depth: 0
      - name: Update goreportcard
        uses: creekorful/goreportcard-action@1f35ced8cdac2cba28c9a2f2288a16aacfd507f9 # v1.0
      - name: Setup go
        uses: actions/setup-go@3041bf56c941b39c61721a86cd11f3bb1338122a # v5.2.0
        with:
          go-version-file: 'go.mod'
          check-latest: true
          cache: false
      - name: Install Syft
        uses: anchore/sbom-action/download-syft@df80a981bc6edbc4e220a492d3cbe9f5547a6e75 # v0.17.9
      - name: Install Cosign
        uses: sigstore/cosign-installer@dc72c7d5c4d10cd6bcb8cf6e3fd625a9e5e537da # v3.7.0
      - name: Run GoReleaser
        id: goreleaser
        uses: goreleaser/goreleaser-action@9ed2f89a662bf1735a48bc8557fd212fa902bebf # v6.1.0
        with:
          version: '~> v2'
          args: release --clean
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      - name: Generate binary hashes
        id: binary
        env:
          ARTIFACTS: "${{ steps.goreleaser.outputs.artifacts }}"
        run: |
          set -euo pipefail
          checksum_file=$(echo "$ARTIFACTS" | jq -r '.[] | select (.type=="Checksum") | .path')
          echo "hashes=$(cat $checksum_file | base64 -w0)" >> "$GITHUB_OUTPUT"

  ko-publish:
    outputs:
      digest: ${{ steps.release.outputs.digest }}
    runs-on: ubuntu-latest
    permissions:
      contents: write
      packages: write
      id-token: write # sign archives with cosign
    steps:
      - name: Checkout repository
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          persist-credentials: false
          fetch-depth: 0
      - name: Setup go
        uses: actions/setup-go@3041bf56c941b39c61721a86cd11f3bb1338122a # v5.2.0
        with:
          go-version-file: 'go.mod'
          check-latest: true
          cache: false
      - name: Install Cosign
        uses: sigstore/cosign-installer@dc72c7d5c4d10cd6bcb8cf6e3fd625a9e5e537da # v3.7.0
      - name: Publish openvpn-exporter
        id: release
        uses: ./.github/actions/publish-image
        with:
          makefile-target: ko-publish
          registry: ghcr.io
          registry-username: ${{ github.actor }}
          registry-password: ${{ secrets.GITHUB_TOKEN }}
          repository: ${{ github.repository_owner }}
          version: ${{ github.ref_name }}
          sign-image: true
          sbom-name: openvpn-exporter
          sbom-repository: ghcr.io/${{ github.repository_owner }}/sbom
          signature-repository: ghcr.io/${{ github.repository_owner }}/signatures
          main-path: ./

  binary-provenance:
    needs: [goreleaser]
    permissions:
      actions: read # To read the workflow path.
      id-token: write # To sign the provenance (fetch an OIDC token from GitHub)
      contents: write # To add assets to a release.
    # MUST be referenced by tag (see https://github.com/slsa-framework/slsa-github-generator/?tab=readme-ov-file#referencing-slsa-builders-and-generators)
    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@v2.0.0
    with:
      base64-subjects: "${{ needs.goreleaser.outputs.hashes }}"
      upload-assets: true # upload to a new release
      draft-release: true

  image-provenance:
    needs: [ko-publish]
    permissions:
      actions: read
      id-token: write
      packages: write
    # MUST be referenced by tag (see https://github.com/slsa-framework/slsa-github-generator/?tab=readme-ov-file#referencing-slsa-builders-and-generators)
    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v2.0.0
    with:
      image: ghcr.io/${{ github.repository_owner }}/openvpn-exporter
      digest: ${{ needs.ko-publish.outputs.digest }}
      registry-username: ${{ github.actor }}
      provenance-registry-username: ${{ github.actor }}
      provenance-repository: ghcr.io/${{ github.repository_owner }}/signatures
    secrets:
      registry-password: ${{ secrets.GITHUB_TOKEN }}
      provenance-registry-password: ${{ secrets.GITHUB_TOKEN }}

  verification-with-cosign:
    needs: [ko-publish, image-provenance]
    runs-on: ubuntu-latest
    permissions: read-all
    steps:
      - name: Checkout repository
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          persist-credentials: false
          fetch-depth: 0

      - name: Login
        uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v3.3.0
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Install Cosign
        uses: sigstore/cosign-installer@dc72c7d5c4d10cd6bcb8cf6e3fd625a9e5e537da # v3.7.0

      - name: Verify provenance of image
        env:
          IMAGE: ghcr.io/${{ github.repository_owner }}/openvpn-exporter
          DIGEST: ${{ needs.ko-publish.outputs.digest }}
          REPOSITORY: ${{ github.repository_owner }}
        run: |
          COSIGN_REPOSITORY=ghcr.io/$REPOSITORY/signatures cosign verify-attestation \
            --type slsaprovenance \
            --certificate-oidc-issuer https://token.actions.githubusercontent.com \
            --certificate-identity-regexp '^https://github.com/slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@refs/tags/v[0-9]+.[0-9]+.[0-9]+$' \
            --policy policy.cue \
            $IMAGE@$DIGEST

      - name: Verify signature of image
        env:
          IMAGE: ghcr.io/${{ github.repository_owner }}/openvpn-exporter
          DIGEST: ${{ needs.ko-publish.outputs.digest }}
          REPOSITORY: ${{ github.repository_owner }}
        run: |
          COSIGN_REPOSITORY=ghcr.io/$REPOSITORY/signatures cosign verify \
            --certificate-oidc-issuer https://token.actions.githubusercontent.com \
            --certificate-identity-regexp '^https://github.com/natrontech/openvpn-exporter/.github/workflows/release.yml@refs/tags/v[0-9]+.[0-9]+.[0-9]+(-rc.[0-9]+)?$' \
            $IMAGE@$DIGEST

      - name: Verify sbom of image
        env:
          IMAGE: ghcr.io/${{ github.repository_owner }}/openvpn-exporter
          DIGEST: ${{ needs.ko-publish.outputs.digest }}
          REPOSITORY: ${{ github.repository_owner }}
        run: |
          COSIGN_REPOSITORY=ghcr.io/$REPOSITORY/sbom cosign verify-attestation \
            --type cyclonedx \
            --certificate-oidc-issuer https://token.actions.githubusercontent.com \
            --certificate-identity-regexp '^https://github.com/natrontech/openvpn-exporter/.github/workflows/release.yml@refs/tags/v[0-9]+.[0-9]+.[0-9]+(-rc.[0-9]+)?$' \
            --policy policy-sbom.cue \
            $IMAGE@$DIGEST