# Supply-chain gate (task 46). Coordinates with task 42's `ci.yml`.
#
# Per-PR legs: `manifest-lint` (kustomize build + scripts/check_manifests.py,
# including the L7-vs-L4 mTLS pairing check).
# Per-push-to-master legs: multi-arch `docker buildx bake` with SBOM +
# provenance, trivy/grype gating HIGH/CRITICAL, keyless cosign signing, and
# digest pinning of `deploy/k8s/kustomization.yaml` (strict lint re-run).
# Scheduled legs (weekly rebuild, Monday 04:00 UTC): rebuild + rescan + resign
# so base-image digests advance even without code changes.
#
# The L7 mTLS constraint is DOCUMENTED (docs/DEPLOYMENT.md) and lint-checked
# here; it is explicitly NOT exercised end-to-end in CI.

name: supply-chain

on:
  push:
    branches: ["master"]
  pull_request: {}
  schedule:
    # Weekly rebuild (Monday 04:00 UTC).
    - cron: "0 4 * * 1"
  workflow_dispatch: {}

permissions:
  contents: read

env:
  REGISTRY_IMAGE: ghcr.io/d-oauth/d-oauth-server
  SQLX_OFFLINE: "true"

jobs:
  manifest-lint:
    name: manifest-lint
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
        with:
          python-version: "3.x"
      - name: Install pyyaml + kustomize
        run: |
          pip install pyyaml
          curl -sSfL https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv5.4.3/kustomize_v5.4.3_linux_amd64.tar.gz \
            | tar -xzf - kustomize && sudo mv kustomize /usr/local/bin/
      - name: Kustomize build
        run: kustomize build deploy/k8s
      - name: Manifest policy lint (probes, PDB, no-baked-secrets, L7-vs-L4 mTLS)
        run: python3 scripts/check_manifests.py

  build:
    name: build
    if: github.event_name == 'push' || github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      id-token: write
    outputs:
      digest: ${{ steps.bake.outputs.digest }}
    steps:
      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
      - uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130 # v3
      - uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3
      - uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Multi-arch bake with SBOM + provenance
        id: bake
        run: |
          TAG="sha-${GITHUB_SHA::12}"
          echo "tag=${TAG}" >> "${GITHUB_OUTPUT}"
          docker buildx bake image \
            --set "image.tags=${REGISTRY_IMAGE}:${TAG}" \
            --set image.output="type=registry" \
            --sbom=true \
            --provenance=mode=max \
            --metadata-file /tmp/bake-metadata.json
          python3 -c "
          import json
          meta = json.load(open('/tmp/bake-metadata.json'))
          node = meta['image']['containerimage.digest']
          open('${GITHUB_OUTPUT}', 'a').write(f'digest={node}\n')
          "
      - name: SBOM (syft, committed as artifact)
        uses: anchore/sbom-action@e22c389904149dbc22b58101806040fa8d37a610 # v0
        with:
          image: ${{ env.REGISTRY_IMAGE }}@${{ steps.bake.outputs.digest }}
          artifact-name: sbom.spdx.json
      - name: Scan (trivy, gate HIGH/CRITICAL)
        uses: aquasecurity/trivy-action@6e7b7d1fd3e4fef0c5fa8cce1229c54b2c9bd0d8 # v0.24.0
        with:
          image-ref: ${{ env.REGISTRY_IMAGE }}@${{ steps.bake.outputs.digest }}
          format: sarif
          output: trivy.sarif
          severity: HIGH,CRITICAL
          exit-code: "1"
      - name: Scan (grype, gate high/critical)
        uses: anchore/scan-action@64a33b277ea7a1215a3c142735a1091341939ff5 # v4
        with:
          image: ${{ env.REGISTRY_IMAGE }}@${{ steps.bake.outputs.digest }}
          fail-build: true
          severity-cutoff: high
      - uses: sigstore/cosign-installer@398d4b0eeef1380460a10c8013a76f728fb906ac # v3
      - name: Keyless sign (cosign, OIDC)
        env:
          COSIGN_YES: "true"
        run: |
          cosign sign "${REGISTRY_IMAGE}@${{ steps.bake.outputs.digest }}"
          cosign attest --predicate /tmp/bake-metadata.json \
            "${REGISTRY_IMAGE}@${{ steps.bake.outputs.digest }}"

  pin-digest:
    name: pin-digest
    needs: [build]
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
        with:
          python-version: "3.x"
      - name: Pin kustomization to the built digest + strict lint
        env:
          DIGEST: ${{ needs.build.outputs.digest }}
        run: |
          pip install pyyaml
          python3 - "${DIGEST}" <<'EOF'
          import sys
          from pathlib import Path
          import yaml
          digest = sys.argv[1]
          assert digest.startswith("sha256:"), f"bad digest: {digest}"
          path = Path("deploy/k8s/kustomization.yaml")
          doc = yaml.safe_load(path.read_text())
          for img in doc.get("images", []):
              if img.get("name") == "ghcr.io/d-oauth/d-oauth-server":
                  img.pop("newTag", None)
                  img["digest"] = digest
          path.write_text(yaml.safe_dump(doc, sort_keys=False))
          EOF
          python3 scripts/check_manifests.py --strict-digest