Added user controller and getUser method

backend/src/modules/user/user.service.ts

@@ -0,0 +1,27 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { User } from 'libs/database/user.entity';
+import { Repository } from 'typeorm';
+import { IGetUser } from './user.dto';
+
+@Injectable()
+export class UserService {
+    private readonly logger: Logger = new Logger(UserService.name);
+    constructor(@InjectRepository(User) private userRepository: Repository<User>) {}
+
+    async getUser(data: IGetUser) {
+        try {
+            this.logger.debug(`[admin.getUser] data: ${JSON.stringify(data)}`);
+            let user = await this.userRepository.findOne({
+                where: { id: data.id },
+            });
+            if (!user) {
+                user = await this.userRepository.save({ id: data.id, user_name: data.username });
+                this.logger.log(`User ${data.id} created`);
+            }
+            return user;
+        } catch (error) {
+            this.logger.log(`[getUser] ${JSON.stringify({ error })}`);
+        }
+    }
+}