mirror change from https://github.com/binhkid2/FullStack-Blog-Nestjs-Nextjs-Postgres

backend/src/common/guards/roles.guard.ts

@@ -0,0 +1,44 @@
+import {
+  CanActivate,
+  ExecutionContext,
+  ForbiddenException,
+  Injectable,
+} from '@nestjs/common';
+import { Reflector } from '@nestjs/core';
+import { ROLES_KEY } from '../decorators/roles.decorator';
+import { IS_PUBLIC_KEY } from '../decorators/public.decorator';
+import { UserRole } from '../../users/entities/user.entity';
+
+@Injectable()
+export class RolesGuard implements CanActivate {
+  constructor(private reflector: Reflector) {}
+
+  canActivate(context: ExecutionContext): boolean {
+    const isPublic = this.reflector.getAllAndOverride<boolean>(IS_PUBLIC_KEY, [
+      context.getHandler(),
+      context.getClass(),
+    ]);
+    if (isPublic) return true;
+
+    const requiredRoles = this.reflector.getAllAndOverride<UserRole[]>(ROLES_KEY, [
+      context.getHandler(),
+      context.getClass(),
+    ]);
+    if (!requiredRoles || requiredRoles.length === 0) return true;
+
+    const request = context.switchToHttp().getRequest();
+    const user = request.user;
+
+    if (!user) {
+      throw new ForbiddenException('Access denied');
+    }
+
+    if (!requiredRoles.includes(user.role)) {
+      throw new ForbiddenException(
+        `Access denied. Required roles: ${requiredRoles.join(', ')}`,
+      );
+    }
+
+    return true;
+  }
+}