fix(auth): fix access tokens on delete account (#207)

* fix(auth): fix access tokens on delete account

* test(user): fix user tests

Author: Alyaa242

src/auth/guards/jwt.guard.ts

@@ -1,10 +1,36 @@
 import { ExecutionContext, Injectable, UnauthorizedException } from '@nestjs/common';
 import { AuthGuard } from '@nestjs/passport';
+import { RedisService } from 'src/redis/redis.service';
 
 @Injectable()
 export class JwtAuthGuard extends AuthGuard('jwt') {
-    override canActivate(context: ExecutionContext) {
-        return super.canActivate(context);
+    constructor(private readonly redis_service: RedisService) {
+        super();
+    }
+
+    override async canActivate(context: ExecutionContext) {
+        const can_activate = await super.canActivate(context);
+
+        if (!can_activate) {
+            return false;
+        }
+
+        const request = context.switchToHttp().getRequest();
+        const user = request.user;
+
+        let is_deleted = false;
+        if (user) {
+            try {
+                is_deleted = await this.redis_service.exists(`deleted_user:${user.id}`);
+            } catch (error) {
+                console.warn('Failed to check deleted user in Redis:', error.message);
+            }
+            if (is_deleted) {
+                throw new UnauthorizedException('User account has been deleted');
+            }
+        }
+
+        return true;
     }
 
     override handleRequest(err: any, user: any, info: any) {