# .github/workflows/examples/stellaops-verify.yml
# StellaOps Verification Gate Reusable Workflow
#
# This reusable workflow verifies attestations before deployment.
# Use it as a gate in your CI/CD pipeline to ensure only properly
# signed artifacts are deployed.
#
# Usage:
#   jobs:
#     verify:
#       uses: stella-ops/templates/.github/workflows/stellaops-verify.yml@v1
#       with:
#         artifact-digest: sha256:abc123...
#         certificate-identity: 'repo:myorg/myrepo:ref:refs/heads/main'
#         certificate-oidc-issuer: 'https://token.actions.githubusercontent.com'
#
# See: docs/modules/signer/guides/keyless-signing.md

name: StellaOps Verify Gate

on:
  workflow_call:
    inputs:
      artifact-digest:
        description: 'SHA256 digest of artifact to verify'
        required: true
        type: string
      stellaops-url:
        description: 'StellaOps API URL'
        required: false
        type: string
        default: 'https://api.stella-ops.org'
      certificate-identity:
        description: 'Expected OIDC identity pattern (supports regex)'
        required: true
        type: string
      certificate-oidc-issuer:
        description: 'Expected OIDC issuer URL'
        required: true
        type: string
      require-rekor:
        description: 'Require Rekor transparency log inclusion proof'
        required: false
        type: boolean
        default: true
      strict:
        description: 'Fail workflow on any verification issue'
        required: false
        type: boolean
        default: true
      max-cert-age-hours:
        description: 'Maximum age of signing certificate in hours (0 = no limit)'
        required: false
        type: number
        default: 0
      require-sbom:
        description: 'Require SBOM attestation'
        required: false
        type: boolean
        default: false
      require-verdict:
        description: 'Require passing policy verdict attestation'
        required: false
        type: boolean
        default: false
      cli-version:
        description: 'StellaOps CLI version to use'
        required: false
        type: string
        default: 'latest'
    outputs:
      verified:
        description: 'Whether all verifications passed'
        value: ${{ jobs.verify.outputs.verified }}
      attestation-count:
        description: 'Number of attestations found'
        value: ${{ jobs.verify.outputs.attestation-count }}
      verification-details:
        description: 'JSON details of verification results'
        value: ${{ jobs.verify.outputs.verification-details }}

jobs:
  verify:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: read

    outputs:
      verified: ${{ steps.verify.outputs.verified }}
      attestation-count: ${{ steps.verify.outputs.attestation-count }}
      verification-details: ${{ steps.verify.outputs.verification-details }}

    steps:
      - name: Validate Inputs
        run: |
          if [[ ! "${{ inputs.artifact-digest }}" =~ ^sha256:[a-f0-9]{64}$ ]] && \
             [[ ! "${{ inputs.artifact-digest }}" =~ ^sha512:[a-f0-9]{128}$ ]]; then
            echo "::error::Invalid artifact-digest format. Expected sha256:... or sha512:..."
            exit 1
          fi

          if [[ -z "${{ inputs.certificate-identity }}" ]]; then
            echo "::error::certificate-identity is required"
            exit 1
          fi

          if [[ -z "${{ inputs.certificate-oidc-issuer }}" ]]; then
            echo "::error::certificate-oidc-issuer is required"
            exit 1
          fi

      - name: Install StellaOps CLI
        uses: stella-ops/setup-cli@v1
        with:
          version: ${{ inputs.cli-version }}

      - name: Verify Attestation
        id: verify
        env:
          STELLAOPS_URL: ${{ inputs.stellaops-url }}
        run: |
          set +e  # Don't exit on error - we handle it

          VERIFY_ARGS=(
            --artifact "${{ inputs.artifact-digest }}"
            --certificate-identity "${{ inputs.certificate-identity }}"
            --certificate-oidc-issuer "${{ inputs.certificate-oidc-issuer }}"
            --output json
          )

          # Add optional flags
          if [[ "${{ inputs.require-rekor }}" == "true" ]]; then
            VERIFY_ARGS+=(--require-rekor)
          fi

          if [[ "${{ inputs.max-cert-age-hours }}" -gt 0 ]]; then
            VERIFY_ARGS+=(--max-cert-age-hours "${{ inputs.max-cert-age-hours }}")
          fi

          if [[ "${{ inputs.require-sbom }}" == "true" ]]; then
            VERIFY_ARGS+=(--require-sbom)
          fi

          if [[ "${{ inputs.require-verdict }}" == "true" ]]; then
            VERIFY_ARGS+=(--require-verdict)
          fi

          echo "::group::Verifying attestations"
          RESULT=$(stella attest verify "${VERIFY_ARGS[@]}" 2>&1)
          EXIT_CODE=$?
          echo "$RESULT" | jq . 2>/dev/null || echo "$RESULT"
          echo "::endgroup::"

          set -e

          # Parse results
          VERIFIED=$(echo "$RESULT" | jq -r '.valid // false')
          ATTESTATION_COUNT=$(echo "$RESULT" | jq -r '.attestationCount // 0')

          echo "verified=${VERIFIED}" >> $GITHUB_OUTPUT
          echo "attestation-count=${ATTESTATION_COUNT}" >> $GITHUB_OUTPUT
          echo "verification-details=$(echo "$RESULT" | jq -c '.')" >> $GITHUB_OUTPUT

          # Handle verification failure
          if [[ "$VERIFIED" != "true" ]]; then
            echo "::warning::Verification failed"

            # Extract and report issues
            ISSUES=$(echo "$RESULT" | jq -r '.issues[]? | "\(.code): \(.message)"' 2>/dev/null)
            if [[ -n "$ISSUES" ]]; then
              while IFS= read -r issue; do
                echo "::error::$issue"
              done <<< "$ISSUES"
            fi

            if [[ "${{ inputs.strict }}" == "true" ]]; then
              echo "::error::Verification failed in strict mode"
              exit 1
            fi
          fi

      - name: Generate Summary
        if: always()
        run: |
          VERIFIED="${{ steps.verify.outputs.verified }}"

          if [[ "$VERIFIED" == "true" ]]; then
            ICON="white_check_mark"
            STATUS="Passed"
          else
            ICON="x"
            STATUS="Failed"
          fi

          cat >> $GITHUB_STEP_SUMMARY << EOF
          ## :${ICON}: Verification ${STATUS}

          | Field | Value |
          |-------|-------|
          | **Artifact** | \`${{ inputs.artifact-digest }}\` |
          | **Expected Identity** | \`${{ inputs.certificate-identity }}\` |
          | **Expected Issuer** | \`${{ inputs.certificate-oidc-issuer }}\` |
          | **Attestations Found** | ${{ steps.verify.outputs.attestation-count }} |
          | **Rekor Required** | ${{ inputs.require-rekor }} |
          | **Strict Mode** | ${{ inputs.strict }} |
          EOF

          # Add issues if any
          DETAILS='${{ steps.verify.outputs.verification-details }}'
          ISSUES=$(echo "$DETAILS" | jq -r '.issues[]? | "- **\(.code)**: \(.message)"' 2>/dev/null)
          if [[ -n "$ISSUES" ]]; then
            cat >> $GITHUB_STEP_SUMMARY << EOF

          ### Issues

          $ISSUES
          EOF
          fi