name: 'Attest SBOM'
description: 'Generate SBOM attestations for build artifacts'
author: 'GitHub'

inputs:
  subject-path:
    description: >
      Path to the artifact serving as the subject of the attestation. Must
      specify exactly one of "subject-path" or "subject-digest".
    required: false
  subject-digest:
    description: >
      SHA256 digest of the subject for for the attestation. Must be in the form
      "sha256:hex_digest" (e.g. "sha256:abc123..."). Must specify exactly one of
      "subject-path" or "subject-digest".
    required: false
  subject-name:
    description: >
      Subject name as it should appear in the attestation. Required unless
      "subject-path" is specified, in which case it will be inferred from the
      path.
  sbom-path:
    description: >
      Path to the JSON-formatted SBOM file to attest. When specified, the
      "scan-path" and "sbom-format" inputs are ignored.
    required: false
  push-to-registry:
    description: >
      Whether to push the provenance statement to the image registry. Requires
      that the "subject-name" parameter specify the fully-qualified image name
      and that the "subject-digest" parameter be specified. Defaults to false.
    default: false
    required: false
  github-token:
    description: >
      The GitHub token used to make authenticated API requests.
    default: ${{ github.token }}
    required: false

outputs:
  bundle-path:
    description: 'The path to the file containing the attestation bundle(s).'
    value: ${{ steps.attest.outputs.bundle-path }}

runs:
  using: 'composite'
  steps:
    - uses: actions/attest-sbom/predicate@847c6befa7ce187c962fa6c3e6cd3c96e4da9565 # predicate@0.1.0
      id: generate-sbom-predicate
      with:
        sbom-path: ${{ inputs.sbom-path || steps.sbom-output.outputs.path }}
    - uses: actions/attest@14e407ca15f1b08f4869fc058b059f7f1e434df6 # v0.1.0
      id: attest
      with:
        subject-path: ${{ inputs.subject-path }}
        subject-digest: ${{ inputs.subject-digest }}
        subject-name: ${{ inputs.subject-name }}
        predicate-type:
          ${{ steps.generate-sbom-predicate.outputs.predicate-type }}
        predicate-path:
          ${{ steps.generate-sbom-predicate.outputs.predicate-path }}
        push-to-registry: ${{ inputs.push-to-registry }}
        github-token: ${{ inputs.github-token }}