[Nest.js] 9 - Authentification - module/components

Contents
1. AuthModule
2. CLI - module, service, controller
3. Entity, repository
4. DTO
5. DI

---

1. AuthModule

---

2. CLI - module, service, controller

$ nest generate module auth

$ nest generate service auth --no-spec

$ nest generate controller auth --no-spec

---

3. Entity, Repository

- src/auth/user.entity.ts

import { BaseEntity, Column, Entity, PrimaryGeneratedColumn } from 'typeorm';

@Entity()
export class User extends BaseEntity {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  username: string;

  @Column()
  password: string;
}

 

- src/auth/user.repository.ts

import { EntityRepository, Repository } from 'typeorm';
import { User } from './user.entity';

@EntityRepository(User)
export class UserRepository extends Repository<User> {}

- register this into where it needed, auth.module.ts below.

 

- src/auth/auth.module.ts

...
import { UserRepository } from './user.repository';

@Module({
  imports: [
    TypeOrmModule.forFeature([UserRepository])
  ],
  ...
})
export class AuthModule {}

---

4. DTO(Data Transfer Object)

- src/auth/dto/auth-credential.dto.ts

import { IsString, Matches, MaxLength, MinLength } from 'class-validator'; // 1

export class AuthCredentialsDto {
  @IsString()
  @MinLength(4)
  @MaxLength(20)
  username: string;

  @IsString()
  @MinLength(4)
  @MaxLength(20)
  @Matches(/^[a-zA-Z0-9]*$/, {
    message: 'password only accepts english and number',
  })
  password: string;
}

// 1. global pipe will validate this dto with the decorators.

---

5. DI(Dependency Injection)

- src/auth/auth.controller.ts

import { Controller } from '@nestjs/common';
import { AuthService } from './auth.service';

@Controller('auth')
export class AuthController {
  constructor(private userService: AuthService) {}
}

 

- src/auth/auth.service.ts

import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { UserRepository } from './user.repository';

@Injectable()
export class AuthService {
  constructor(
    @InjectRepository(UserRepository)
    private userRepository: UserRepository,
  ) {}
}