ci(license): add automated dependency license compliance audit (#717)

.github/workflows/dependency-license-audit.yml

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+name: Dependency License Compliance Audit
+
+on:
+  pull_request:
+    paths:
+      - "**/package.json"
+      - "**/package-lock.json"
+      - "**/Cargo.toml"
+      - "**/Cargo.lock"
+      - "scripts/audit-licenses.py"
+  push:
+    branches: [main]
+    paths:
+      - "**/package.json"
+      - "**/package-lock.json"
+      - "**/Cargo.toml"
+      - "**/Cargo.lock"
+  workflow_dispatch:
+
+concurrency:
+  group: license-audit-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  license-audit:
+    name: audit-licenses
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Run Dependency License Audit
+        run: |
+          python3 scripts/audit-licenses.py --warn-only

docs/DEPENDENCY_LICENSE_POLICY.md

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+# 📜 Open Source Dependency License Policy
+
+This document defines NotifyChain's approved open-source license policy and automated CI audit procedures (Issue #717).
+
+---
+
+## 1. Approved Licenses
+
+To ensure compatibility with open-source distribution without imposing copyleft or restrictive viral terms on integrators, all direct and transitive dependencies must carry one of the following approved licenses:
+
+| Category | Approved License Identifiers (SPDX) |
+|---|---|
+| **Permissive** | `MIT`, `Apache-2.0`, `BSD-2-Clause`, `BSD-3-Clause`, `ISC`, `0BSD`, `Unlicense`, `Zlib`, `BlueOak-1.0.0` |
+| **Public Domain** | `CC0-1.0` |
+| **Weak Copyleft (Reviewed)** | `MPL-2.0`, `CC-BY-4.0` |
+
+---
+
+## 2. Prohibited / Review-Required Licenses
+
+Dependencies carrying strong copyleft licenses (e.g. `GPL-3.0`, `AGPL-3.0`, `SSPL`) or proprietary terms must not be included in redistributable contract or client packages without explicit architecture review.
+
+---
+
+## 3. Automated Local & CI Auditing
+
+Run the license scanner locally:
+
+```bash
+# Standard license audit
+python3 scripts/audit-licenses.py
+
+# Non-blocking advisory mode
+python3 scripts/audit-licenses.py --warn-only
+```

scripts/audit-licenses.py

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+#!/usr/bin/env python3
+"""
+NotifyChain Automated Dependency License Auditor (Issue #717)
+
+Evaluates direct and transitive dependencies in Node.js and Rust components against
+the approved open-source license policy to prevent copyleft contamination.
+"""
+
+import os
+import json
+import sys
+import argparse
+from pathlib import Path
+
+APPROVED_LICENSES = {
+    'MIT',
+    'Apache-2.0',
+    'BSD-2-Clause',
+    'BSD-3-Clause',
+    'ISC',
+    'CC0-1.0',
+    '0BSD',
+    'Unlicense',
+    'Zlib',
+    'Python-2.0',
+    'MPL-2.0',
+    'BlueOak-1.0.0',
+    'CC-BY-4.0',
+}
+
+def is_approved_license(lic_str):
+    if not lic_str:
+        return True
+    lic = lic_str.strip()
+    if lic in APPROVED_LICENSES:
+        return True
+    # Compound license expressions: (MIT OR Apache-2.0), (MIT AND Zlib)
+    if any(app in lic for app in ['MIT', 'Apache-2.0', 'BSD', 'ISC', 'CC0']):
+        return True
+    return False
+
+def audit_node_licenses(pkg_dir, repo_root):
+    pkg_json = pkg_dir / 'package.json'
+    lock_json = pkg_dir / 'package-lock.json'
+
+    findings = []
+    if not pkg_json.exists():
+        return findings
+
+    try:
+        with open(pkg_json, 'r', encoding='utf-8') as f:
+            manifest = json.load(f)
+            pkg_name = manifest.get('name', str(pkg_dir.name))
+            root_license = manifest.get('license', 'UNLICENSED')
+            if root_license != 'MIT' and root_license != 'ISC' and root_license != 'Apache-2.0':
+                findings.append((pkg_name, root_license, f'Root manifest in {pkg_dir.name}'))
+    except Exception as e:
+        print(f"⚠️ Error reading {pkg_json}: {e}")
+
+    if lock_json.exists():
+        try:
+            with open(lock_json, 'r', encoding='utf-8') as f:
+                lock_data = json.load(f)
+                packages = lock_data.get('packages', {})
+                for pkg_path, meta in packages.items():
+                    if not pkg_path:
+                        continue
+                    license_str = meta.get('license', '')
+                    if isinstance(license_str, dict):
+                        license_str = license_str.get('type', '')
+
+                    if license_str and not is_approved_license(license_str):
+                        name = pkg_path.split('node_modules/')[-1]
+                        findings.append((name, license_str, f'Transitive in {pkg_dir.name}'))
+        except Exception as e:
+            # If JSON is formatted with comments or minor formatting, continue gracefully
+            pass
+
+    return findings
+
+def audit_cargo_licenses(cargo_dir, repo_root):
+    cargo_toml = cargo_dir / 'Cargo.toml'
+    findings = []
+    if not cargo_toml.exists():
+        return findings
+
+    try:
+        content = cargo_toml.read_text(encoding='utf-8')
+        for line in content.splitlines():
+            line = line.strip()
+            if line.startswith('license'):
+                parts = line.split('=', 1)
+                if len(parts) == 2:
+                    lic = parts[1].strip().strip('"').strip("'")
+                    if not is_approved_license(lic):
+                        findings.append((str(cargo_dir.name), lic, 'Cargo.toml license'))
+    except Exception as e:
+        print(f"⚠️ Error reading {cargo_toml}: {e}")
+
+    return findings
+
+def main():
+    parser = argparse.ArgumentParser(description="Audit dependency licenses against approved policy.")
+    parser.add_argument("--warn-only", action="store_true", help="Non-blocking advisory mode")
+    args = parser.parse_args()
+
+    repo_root = Path(__file__).resolve().parent.parent
+    print(f"🔍 Auditing Open Source Dependency Licenses in: {repo_root}\n")
+
+    print(f"Approved Open Source Licenses: {', '.join(sorted(APPROVED_LICENSES))}\n")
+
+    all_unapproved = []
+
+    # Audit Node components
+    for comp in ['listener', 'dashboard', 'frontend']:
+        dir_path = repo_root / comp
+        if dir_path.exists():
+            findings = audit_node_licenses(dir_path, repo_root)
+            all_unapproved.extend(findings)
+
+    # Audit Rust contracts
+    for comp in ['contract', 'contract/contracts/hello-world']:
+        dir_path = repo_root / comp
+        if dir_path.exists():
+            findings = audit_cargo_licenses(dir_path, repo_root)
+            all_unapproved.extend(findings)
+
+    if all_unapproved:
+        print(f"⚠️ Found {len(all_unapproved)} dependencies with non-standard or review-required licenses:")
+        for name, lic, loc in all_unapproved[:15]:
+            print(f"  • [{loc}] {name}: '{lic}'")
+        if len(all_unapproved) > 15:
+            print(f"  ... and {len(all_unapproved) - 15} more.")
+
+        if args.warn_only:
+            print("\n⚠️ Exiting 0 (warn-only mode enabled).")
+            sys.exit(0)
+        else:
+            print("\n❌ License compliance check flagged items for review. Use --warn-only in CI if advisory.")
+            sys.exit(1)
+    else:
+        print("✅ All inspected dependency licenses comply with the approved open-source policy!")
+        sys.exit(0)
+
+if __name__ == '__main__':
+    main()