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return {
access_token: this.jwtService.sign(payload),
};
}

async signup(user: PostSignupDTO) {
if (await this.usersService.isExist(user.userId)) {
throw new HttpException('User already exists', 400);
}
const salt = await bcrypt.genSalt();
const hashedPassword = await bcrypt.hash(user.password, salt);
this.usersService.create({
userId: user.userId,
name: user.name,
nickname: user.nickname,
email: user.email,
password: hashedPassword,
});
return true;
}
}

src/auth/constants.ts
export const jwtConstants = {
secret: '1!2@3#4$5%6^7&8*9(0)_-+=',
};
src/auth/strategies/local.strategy.ts
import { Injectable, UnauthorizedException } from '@nestjs/common';
import { PassportStrategy } from '@nestjs/passport';
import { Strategy } from 'passport-local';
import { AuthService } from '../auth.service';

@Injectable()
export class LocalStrategy extends PassportStrategy(Strategy) {
constructor(private authService: AuthService) {
super({
usernameField: 'userId',
});
}

async validate(username: string, password: string): Promise<any> {
const user = await this.authService.validateUser(username, password);
if (!user) {
throw new UnauthorizedException();