feat: hierarchical group & permission model (v1.25.0)

- Add utils/groups.js: the group schema + inheritance resolver (god_admin,
  {site}_super_admin, {site}_hosts_*/{site}_apps_* aggregates, per-resource
  admin/access/<capability>, meta everyone/{site}_everyone). admin implies
  access; capabilities explicit; hosts/apps orthogonal; cross-site isolated.
- permission.js: recognize god_admin (legacy app_super_admin aliased) and add
  onResource/requireResource for resource-level checks + everyone meta grants.
- user.js isAdmin: recognize god_admin + site-scoped super/app-admin groups.
- Remove the standalone Groups page (nav + route + view); groups are managed on
  adopted Directory resources. Add a /docs/groups help link in the Directory
  toolbar (GROUPS.md copied into the SSO docs).
- tests/groups.test.js: full resolver coverage (15 tests).

Co-Authored-By: Claude <noreply@anthropic.com>

nodejs/tests/groups.test.js

@@ -0,0 +1,114 @@
+'use strict';
+
+const {
+	slugify,
+	resourceGroupCns,
+	aggregateGroupCns,
+	siteSuperAdminCns,
+	siteEveryoneCns,
+	isKnownLevel,
+	levelGrants,
+	hasPermission,
+	GOD_ADMIN,
+} = require('../utils/groups');
+
+const HOST = { site: 'Main Office', kind: 'host', slug: 'Web 01' };
+const APP = { site: 'main-office', kind: 'app', slug: 'emby' };
+const OTHER_SITE_HOST = { site: 'branch-office', kind: 'host', slug: 'db' };
+
+describe('slugify', () => {
+	test('lowercases, spaces and underscores become hyphens, no leading/trailing dash', () => {
+		expect(slugify('Web 01')).toBe('web-01');
+		expect(slugify('Main Office')).toBe('main-office');
+		expect(slugify('my_host')).toBe('my-host');
+		expect(slugify('  Mixed CASE--name  ')).toBe('mixed-case-name');
+		expect(slugify('')).toBe('');
+	});
+	test('never contains an underscore (the structural delimiter)', () => {
+		expect(slugify('a_b_c')).not.toContain('_');
+		expect(resourceGroupCns('Main Office', 'host', 'Web 01', 'access')).not.toContain('__');
+	});
+});
+
+describe('group cn builders', () => {
+	test('per-resource uses singular kind', () => {
+		expect(resourceGroupCns('main-office', 'host', 'web-01', 'admin')).toBe('main-office_host_web-01_admin');
+		expect(resourceGroupCns('main-office', 'app', 'emby', 'access')).toBe('main-office_app_emby_access');
+	});
+	test('aggregate uses plural kind', () => {
+		expect(aggregateGroupCns('main-office', 'host', 'admin')).toBe('main-office_hosts_admin');
+		expect(aggregateGroupCns('main-office', 'app', 'access')).toBe('main-office_apps_access');
+	});
+	test('site super admin + everyone', () => {
+		expect(siteSuperAdminCns('Main Office')).toBe('main-office_super_admin');
+		expect(siteEveryoneCns('main-office')).toBe('main-office_everyone');
+	});
+	test('invalid kind throws', () => {
+		expect(() => resourceGroupCns('s', 'service', 'x', 'admin')).toThrow();
+	});
+});
+
+describe('levels', () => {
+	test('admin/access known; capabilities opaque', () => {
+		expect(isKnownLevel('admin')).toBe(true);
+		expect(isKnownLevel('access')).toBe(true);
+		expect(isKnownLevel('reboot')).toBe(false);
+		expect(isKnownLevel('emby_admin')).toBe(false);
+	});
+	test('admin implies access; access does not imply admin', () => {
+		expect(levelGrants('admin', 'access')).toBe(true);
+		expect(levelGrants('access', 'admin')).toBe(false);
+	});
+});
+
+describe('hasPermission — inheritance', () => {
+	test('god_admin grants everything everywhere', () => {
+		expect(hasPermission([GOD_ADMIN], HOST, 'admin')).toBe(true);
+		expect(hasPermission([GOD_ADMIN], HOST, 'access')).toBe(true);
+		expect(hasPermission([GOD_ADMIN], HOST, 'reboot')).toBe(true);
+		expect(hasPermission([GOD_ADMIN], OTHER_SITE_HOST, 'admin')).toBe(true);
+	});
+
+	test('site super admin grants everything on its site, not other sites', () => {
+		expect(hasPermission(['main-office_super_admin'], HOST, 'admin')).toBe(true);
+		expect(hasPermission(['main-office_super_admin'], HOST, 'reboot')).toBe(true);
+		expect(hasPermission(['main-office_super_admin'], OTHER_SITE_HOST, 'admin')).toBe(false);
+	});
+
+	test('aggregate (all hosts) grants on any host at the site', () => {
+		expect(hasPermission(['main-office_hosts_admin'], HOST, 'admin')).toBe(true);
+		expect(hasPermission(['main-office_hosts_access'], HOST, 'access')).toBe(true);
+		expect(hasPermission(['main-office_hosts_admin'], HOST, 'access')).toBe(true);
+	});
+
+	test('specific host group grants only that host', () => {
+		const cn = resourceGroupCns('main-office', 'host', 'web-01', 'admin');
+		expect(hasPermission([cn], HOST, 'admin')).toBe(true);
+		expect(hasPermission([cn], OTHER_SITE_HOST, 'admin')).toBe(false);
+	});
+
+	test('admin implies access; access does not imply admin', () => {
+		expect(hasPermission([resourceGroupCns('main-office', 'host', 'web-01', 'admin')], HOST, 'access')).toBe(true);
+		expect(hasPermission([resourceGroupCns('main-office', 'host', 'web-01', 'access')], HOST, 'admin')).toBe(false);
+	});
+
+	test('capabilities are exact — admin does not grant a capability', () => {
+		expect(hasPermission([resourceGroupCns('main-office', 'host', 'web-01', 'reboot')], HOST, 'reboot')).toBe(true);
+		expect(hasPermission([resourceGroupCns('main-office', 'host', 'web-01', 'admin')], HOST, 'reboot')).toBe(false);
+		// aggregate capability
+		expect(hasPermission(['main-office_hosts_reboot'], HOST, 'reboot')).toBe(true);
+	});
+
+	test('hosts and apps are orthogonal namespaces', () => {
+		const hostAdmin = resourceGroupCns('main-office', 'host', 'web-01', 'admin');
+		expect(hasPermission([hostAdmin], APP, 'access')).toBe(false);
+		const appAdmin = resourceGroupCns('main-office', 'app', 'emby', 'admin');
+		expect(hasPermission([appAdmin], APP, 'access')).toBe(true);
+	});
+
+	test('cross-site isolation', () => {
+		const mainHostAdmin = resourceGroupCns('main-office', 'host', 'web-01', 'admin');
+		expect(hasPermission([mainHostAdmin], OTHER_SITE_HOST, 'access')).toBe(false);
+		expect(hasPermission(['branch-office_hosts_admin'], OTHER_SITE_HOST, 'admin')).toBe(true);
+	});
+});