tenant-engine/scripts/check_layer_conformance.py

#!/usr/bin/env python3
"""Check tenant-engine against the NetKingdom security layer model (§5, §11).

Read-only. Makes two mechanical checks:

1. INTENT.md frontmatter and layer.yaml agree on layer and role.
2. No catalogued Tooling client (OpenBao, key-cape) appears in src/
   unless it maps to a declared §5.1 / §5.2 / §5.3 entry.

PostgreSQL / SQLite / httpx-to-flex-auth / httpx-to-audit-core are not
Tooling contacts. They are listed in layer.yaml non_tooling_clients so
the inventory is total.

Exit 0 clean, 1 undeclared contact, 2 declaration malformed.
"""
from __future__ import annotations

import argparse
import ast
import re
import sys
from pathlib import Path

try:
    import yaml
except ImportError:  # pragma: no cover - dev extra
    print("FAIL: PyYAML is required (pip install pyyaml)", file=sys.stderr)
    raise SystemExit(2)

ROOT = Path(__file__).resolve().parents[1]
SRC = ROOT / "src" / "tenant_engine"
DECL = ROOT / "layer.yaml"
INTENT = ROOT / "INTENT.md"

# Catalogued Tooling in statute §4 today: key-cape and OpenBao.
# Import roots that would constitute a direct client of those.
TOOLING_IMPORTS = {
    "hvac": "OpenBao / Vault client",
    "bao": "OpenBao client",
    "keycloak": "key-cape / Keycloak client",
    "ldap3": "direct LDAP client (key-cape tooling)",
    "python_ldap": "direct LDAP client (key-cape tooling)",
}

TOOLING_ARGV = re.compile(r"""\[\s*(?:["']bao["']|bao_bin\b|bao_binary\b)\s*,""")
OPENBAO_ADDR = re.compile(r"\b(?:VAULT_ADDR|BAO_ADDR|X-Vault-Token)\b")


def load_declaration() -> dict:
    if not DECL.exists():
        print(f"FAIL: no declaration at {DECL.relative_to(ROOT)} (§11)", file=sys.stderr)
        raise SystemExit(2)
    try:
        data = yaml.safe_load(DECL.read_text())
    except yaml.YAMLError as exc:
        print(f"FAIL: {DECL.name} is not parseable: {exc}", file=sys.stderr)
        raise SystemExit(2) from exc
    for key in ("layer", "role", "repository", "standard_version", "tooling_contacts"):
        if key not in data:
            print(f"FAIL: {DECL.name} missing required key '{key}'", file=sys.stderr)
            raise SystemExit(2)
    if str(data["layer"]).lower() != "engine":
        print(f"FAIL: declared layer is {data['layer']!r}, expected engine", file=sys.stderr)
        raise SystemExit(2)
    if str(data["role"]).lower() != "pip":
        print(f"FAIL: declared role is {data['role']!r}, expected pip", file=sys.stderr)
        raise SystemExit(2)
    if data["repository"] != "tenant-engine":
        print(f"FAIL: repository is {data['repository']!r}", file=sys.stderr)
        raise SystemExit(2)
    return data


def intent_frontmatter() -> dict:
    text = INTENT.read_text()
    if not text.startswith("---"):
        print("FAIL: INTENT.md has no YAML frontmatter", file=sys.stderr)
        raise SystemExit(2)
    block = text.split("---", 2)[1]
    data = yaml.safe_load(block) or {}
    if str(data.get("layer", "")).lower() != "engine":
        print(f"FAIL: INTENT.md layer is {data.get('layer')!r}, expected Engine", file=sys.stderr)
        raise SystemExit(2)
    if str(data.get("role", "")).lower() != "pip":
        print(f"FAIL: INTENT.md role is {data.get('role')!r}, expected PIP", file=sys.stderr)
        raise SystemExit(2)
    return data


def imported_modules(path: Path) -> set[str]:
    try:
        tree = ast.parse(path.read_text())
    except SyntaxError:
        return set()
    found: set[str] = set()
    for node in ast.walk(tree):
        if isinstance(node, ast.Import):
            found.update(alias.name.split(".")[0] for alias in node.names)
        elif isinstance(node, ast.ImportFrom) and node.level == 0 and node.module:
            found.add(node.module.split(".")[0])
    return found


def scan() -> list[tuple[Path, str, str]]:
    hits: list[tuple[Path, str, str]] = []
    for path in sorted(SRC.rglob("*.py")):
        text = path.read_text()
        for module in sorted(imported_modules(path)):
            if module in TOOLING_IMPORTS:
                hits.append((path, module, TOOLING_IMPORTS[module]))
        if TOOLING_ARGV.search(text) or OPENBAO_ADDR.search(text):
            hits.append((path, "openbao-invocation", "OpenBao argv or address"))
    return hits


def main() -> int:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--report", action="store_true")
    args = parser.parse_args()

    decl = load_declaration()
    intent_frontmatter()
    hits = scan()

    if args.report:
        print(f"tenant-engine — layer {decl['layer']}, role {decl['role']}, "
              f"standard v{decl['standard_version']}")
        print(f"  tooling contacts declared: {len(decl.get('tooling_contacts') or [])}")
        print(f"  non-tooling clients: {len(decl.get('non_tooling_clients') or [])}")

    if hits:
        print("", file=sys.stderr)
        print("FAIL: undeclared Tooling-layer client (§11 undeclared violation)", file=sys.stderr)
        for path, module, what in hits:
            print(f"  {path.relative_to(ROOT)}: {module} — {what}", file=sys.stderr)
        return 1

    if decl.get("tooling_contacts"):
        print("FAIL: tooling_contacts is not empty; this engine claimed none", file=sys.stderr)
        return 1

    if not args.report:
        print(f"OK: Engine/PIP declaration matches INTENT.md; no Tooling client in "
              f"{SRC.relative_to(ROOT)}")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())