📝 BE TIL Day 21 0411

⬇️ Main Note
https://docs.google.com/document/d/1x5mrwS0IoRmVkAR_N6FGwgVxZypR8qctSiPNYQJkcNE/edit

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🌿 bcrypt

Hashing the user password and saving the user-password to database with encrypted.

// ============== Resolver ==============
import { Args, Mutation, Resolver } from '@nestjs/graphql';
import { User } from './entities/user.entity';
import { UserService } from './user.service';
import * as bcrypt from 'bcrypt';

@Resolver()
export class UserResolver {
  constructor(private readonly userService: UserService) {}

  @Mutation(() => User)
  async createUser(
    @Args('email') email: string,
    @Args('password') password: string,
    @Args('name') name: string,
    @Args('age') age: number,
  ) {
    const hashedPassword = await bcrypt.hash(password, 10); // res : hash된 이후에 받을 수 있는 최종 값
    console.log(hashedPassword);
    return await this.userService.create({ email, hashedPassword, name, age }); // ({프론트에서 받은 내용을 보내줘야함})
  }
}

// ============== Services ==============
import { ConflictException, Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { User } from './entities/user.entity';

@Injectable()
export class UserService {
  constructor(
    @InjectRepository(User)
    private readonly userRepository: Repository<User>,
  ) {}

  async create({ email, hashedPassword, name, age }) {
    // email 중복 체크
    const user = await this.userRepository.findOne({ email });

    // 가입된 이메일이 충돌이 난 것 - 409
    if (user) throw new ConflictException('이미 등록된 이메일 입니다'); // 배포할떈 이런거 빼야함 (해커들이 해킹할 가능성이 있음 이러한 오류 발자국을 보고)
    console.log(hashedPassword);
    return await this.userRepository.save({
      email,
      password: hashedPassword,
      name,
      age,
    });
  }
}

☁️ JWT

If there exists correspoding user during login progress, backend sends accessToken to frontend. getAccessToken

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🌿 Guarding Structure Flow