Added user controller and getUser method

backend/src/modules/user/user.controller.ts

@@ -0,0 +1,18 @@
+import { Body, Controller, Post } from '@nestjs/common';
+import { ApiOperation, ApiTags } from '@nestjs/swagger';
+import { IGetUser } from './user.dto';
+import { UserService } from './user.service';
+
+@ApiTags('User')
+@Controller('user')
+export class UserController {
+    constructor(private adminService: UserService) {}
+
+    @ApiOperation({
+        description: 'Create or get user from db',
+    })
+    @Post('get')
+    async getUser(@Body() data: IGetUser) {
+        return await this.adminService.getUser(data);
+    }
+}

backend/src/modules/user/user.dto.ts

@@ -0,0 +1,6 @@
+import { ApiProperty } from '@nestjs/swagger';
+
+export class IGetUser {
+    @ApiProperty({ description: 'telegram id', example: '123456' }) readonly id: string;
+    @ApiProperty({ description: 'telegram username', example: 'durov' }) readonly username?: string;
+}

backend/src/modules/user/user.module.ts

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+import { Module } from '@nestjs/common';
+import { LibsModule } from 'libs/libs.module';
+import { UserController } from './user.controller';
+import { UserService } from './user.service';
+
+@Module({
+    imports: [LibsModule],
+    controllers: [UserController],
+    providers: [UserService],
+})
+export class UserModule {}

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

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+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 })}`);
+        }
+    }
+}