feat(server): add administrator feature (#6995)

packages/backend/server/src/core/common/admin-guard.ts

@@ -0,0 +1,52 @@
+import type {
+  CanActivate,
+  ExecutionContext,
+  OnModuleInit,
+} from '@nestjs/common';
+import { Injectable, UnauthorizedException, UseGuards } from '@nestjs/common';
+import { ModuleRef } from '@nestjs/core';
+
+import { getRequestResponseFromContext } from '../../fundamentals';
+import { FeatureManagementService } from '../features';
+
+@Injectable()
+export class AdminGuard implements CanActivate, OnModuleInit {
+  private feature!: FeatureManagementService;
+
+  constructor(private readonly ref: ModuleRef) {}
+
+  onModuleInit() {
+    this.feature = this.ref.get(FeatureManagementService, { strict: false });
+  }
+
+  async canActivate(context: ExecutionContext) {
+    const { req } = getRequestResponseFromContext(context);
+    let allow = false;
+    if (req.user) {
+      allow = await this.feature.isAdmin(req.user.id);
+    }
+
+    if (!allow) {
+      throw new UnauthorizedException('Your operation is not allowed.');
+    }
+
+    return true;
+  }
+}
+
+/**
+ * This guard is used to protect routes/queries/mutations that require a user to be administrator.
+ *
+ * @example
+ *
+ * ```typescript
+ * \@Admin()
+ * \@Mutation(() => UserType)
+ * createAccount(userInput: UserInput) {
+ *   // ...
+ * }
+ * ```
+ */
+export const Admin = () => {
+  return UseGuards(AdminGuard);
+};

packages/backend/server/src/core/common/index.ts

@@ -0,0 +1 @@
+export * from './admin-guard';