first (part 3: src directory)

src/common/decorators/index.ts

@@ -0,0 +1,60 @@
+import {
+  createParamDecorator,
+  ExecutionContext,
+  SetMetadata,
+} from '@nestjs/common';
+
+/**
+ * Get the current authenticated user from request
+ */
+export const CurrentUser = createParamDecorator(
+  (data: string | undefined, ctx: ExecutionContext) => {
+    const request = ctx.switchToHttp().getRequest();
+    const user = request.user;
+
+    if (data) {
+      return user?.[data];
+    }
+
+    return user;
+  },
+);
+
+/**
+ * Mark a route as public (no authentication required)
+ */
+export const IS_PUBLIC_KEY = 'isPublic';
+export const Public = () => SetMetadata(IS_PUBLIC_KEY, true);
+
+/**
+ * Require specific roles to access a route
+ */
+export const ROLES_KEY = 'roles';
+export const Roles = (...roles: string[]) => SetMetadata(ROLES_KEY, roles);
+
+/**
+ * Require specific permissions to access a route
+ */
+export const PERMISSIONS_KEY = 'permissions';
+export const RequirePermissions = (...permissions: string[]) =>
+  SetMetadata(PERMISSIONS_KEY, permissions);
+
+/**
+ * Get tenant ID from request (for multi-tenancy)
+ */
+export const CurrentTenant = createParamDecorator(
+  (data: unknown, ctx: ExecutionContext) => {
+    const request = ctx.switchToHttp().getRequest();
+    return request.tenantId;
+  },
+);
+
+/**
+ * Get the current language from request headers
+ */
+export const CurrentLang = createParamDecorator(
+  (data: unknown, ctx: ExecutionContext) => {
+    const request = ctx.switchToHttp().getRequest();
+    return request.headers['accept-language'] || 'en';
+  },
+);