feat(nestjs): migrate to NestJS

packages/server/src/modules/Roles/TenantAbilities.ts

@@ -0,0 +1,55 @@
+import { Ability } from '@casl/ability';
+import LruCache from 'lru-cache';
+import { Role } from './models/Role.model';
+import { RolePermission } from './models/RolePermission.model';
+
+// store abilities of 1000 most active users
+export const ABILITIES_CACHE = new LruCache(1000);
+
+/**
+ * Retrieve ability for the given role.
+ * @param {} role
+ * @returns
+ */
+export function getAbilityForRole(role) {
+  const rules = getAbilitiesRolesConds(role);
+  return new Ability(rules);
+}
+
+/**
+ * Retrieve abilities of the given role.
+ * @param {IRole} role
+ * @returns {}
+ */
+function getAbilitiesRolesConds(role: Role) {
+  switch (role.slug) {
+    case 'admin': // predefined role.
+      return getSuperAdminRules();
+    default:
+      return getRulesFromRolePermissions(role.permissions || []);
+  }
+}
+
+/**
+ * Retrieve the super admin rules.
+ * @returns {}
+ */
+function getSuperAdminRules() {
+  return [{ action: 'manage', subject: 'all' }];
+}
+
+/**
+ * Retrieve CASL rules from role permissions.
+ * @param {RolePermission[]} permissions -
+ * @returns {}
+ */
+function getRulesFromRolePermissions(permissions: RolePermission[]) {
+  return permissions
+    .filter((permission: RolePermission) => permission.value)
+    .map((permission: RolePermission) => {
+      return {
+        action: permission.ability,
+        subject: permission.subject,
+      };
+    });
+}