feat(server): port resolvers to node server (#2026)

Co-authored-by: Himself65 <himself65@outlook.com>

apps/server/src/modules/auth/guard.ts

@@ -0,0 +1,82 @@
+import {
+  CanActivate,
+  createParamDecorator,
+  ExecutionContext,
+  Injectable,
+  UseGuards,
+} from '@nestjs/common';
+
+import { PrismaService } from '../../prisma';
+import { getRequestResponseFromContext } from '../../utils/nestjs';
+import { AuthService } from './service';
+
+export function getUserFromContext(context: ExecutionContext) {
+  const req = getRequestResponseFromContext(context).req;
+  return req.user;
+}
+
+/**
+ * Used to fetch current user from the request context.
+ *
+ * > The user may be undefined if authorization token is not provided.
+ *
+ * @example
+ *
+ * ```typescript
+ * // Graphql Query
+ * \@Query(() => UserType)
+ * user(@CurrentUser() user?: User) {
+ *  return user;
+ * }
+ * ```
+ *
+ * ```typescript
+ * // HTTP Controller
+ * \@Get('/user)
+ * user(@CurrentUser() user?: User) {
+ *   return user;
+ * }
+ * ```
+ */
+export const CurrentUser = createParamDecorator(
+  (_: unknown, context: ExecutionContext) => {
+    return getUserFromContext(context);
+  }
+);
+
+@Injectable()
+class AuthGuard implements CanActivate {
+  constructor(private auth: AuthService, private prisma: PrismaService) {}
+
+  async canActivate(context: ExecutionContext) {
+    const { req } = getRequestResponseFromContext(context);
+    const token = req.headers.authorization;
+    if (!token) {
+      return false;
+    }
+
+    const claims = this.auth.verify(token);
+    req.user = await this.prisma.user.findUnique({ where: { id: claims.id } });
+    return !!req.user;
+  }
+}
+
+/**
+ * This guard is used to protect routes/queries/mutations that require a user to be logged in.
+ *
+ * The `@CurrentUser()` parameter decorator used in a `Auth` guarded queries would always give us the user because the `Auth` guard will
+ * fast throw if user is not logged in.
+ *
+ * @example
+ *
+ * ```typescript
+ * \@Auth()
+ * \@Query(() => UserType)
+ * user(@CurrentUser() user: User) {
+ *   return user;
+ * }
+ * ```
+ */
+export const Auth = () => {
+  return UseGuards(AuthGuard);
+};