Add Nestjs Backend Server with Prisma setup, User Authentication

+# Environment variables declared in this file are automatically made available to Prisma.
+# See the documentation for more detail: https://pris.ly/d/prisma-schema#using-environment-variables
+
+# Prisma supports the native connection string format for PostgreSQL, MySQL, SQLite, SQL Server and MongoDB (Preview).
+# See the documentation for all the connection string options: https://pris.ly/d/connection-strings
+
+DATABASE_URL="postgresql://postgres:12345@localhost:5432/postgres"
\ No newline at end of file

+module.exports = {
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    project: 'tsconfig.json',
+    sourceType: 'module',
+  },
+  plugins: ['@typescript-eslint/eslint-plugin'],
+  extends: [
+    'plugin:@typescript-eslint/recommended',
+    'plugin:prettier/recommended',
+  ],
+  root: true,
+  env: {
+    node: true,
+    jest: true,
+  },
+  ignorePatterns: ['.eslintrc.js'],
+  rules: {
+    '@typescript-eslint/interface-name-prefix': 'off',
+    '@typescript-eslint/explicit-function-return-type': 'off',
+    '@typescript-eslint/explicit-module-boundary-types': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+  },
+};

+# compiled output
+/dist
+/node_modules
+
+# Logs
+logs
+*.log
+npm-debug.log*
+pnpm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# OS
+.DS_Store
+
+# Tests
+/coverage
+/.nyc_output
+
+# IDEs and editors
+/.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
\ No newline at end of file

+{
+  "singleQuote": true,
+  "trailingComma": "all"
+}
\ No newline at end of file

+<p align="center">
+  <a href="http://nestjs.com/" target="blank"><img src="https://nestjs.com/img/logo_text.svg" width="320" alt="Nest Logo" /></a>
+</p>
+
+[circleci-image]: https://img.shields.io/circleci/build/github/nestjs/nest/master?token=abc123def456
+[circleci-url]: https://circleci.com/gh/nestjs/nest
+
+  <p align="center">A progressive <a href="http://nodejs.org" target="_blank">Node.js</a> framework for building efficient and scalable server-side applications.</p>
+    <p align="center">
+<a href="https://www.npmjs.com/~nestjscore" target="_blank"><img src="https://img.shields.io/npm/v/@nestjs/core.svg" alt="NPM Version" /></a>
+<a href="https://www.npmjs.com/~nestjscore" target="_blank"><img src="https://img.shields.io/npm/l/@nestjs/core.svg" alt="Package License" /></a>
+<a href="https://www.npmjs.com/~nestjscore" target="_blank"><img src="https://img.shields.io/npm/dm/@nestjs/common.svg" alt="NPM Downloads" /></a>
+<a href="https://circleci.com/gh/nestjs/nest" target="_blank"><img src="https://img.shields.io/circleci/build/github/nestjs/nest/master" alt="CircleCI" /></a>
+<a href="https://coveralls.io/github/nestjs/nest?branch=master" target="_blank"><img src="https://coveralls.io/repos/github/nestjs/nest/badge.svg?branch=master#9" alt="Coverage" /></a>
+<a href="https://discord.gg/G7Qnnhy" target="_blank"><img src="https://img.shields.io/badge/discord-online-brightgreen.svg" alt="Discord"/></a>
+<a href="https://opencollective.com/nest#backer" target="_blank"><img src="https://opencollective.com/nest/backers/badge.svg" alt="Backers on Open Collective" /></a>
+<a href="https://opencollective.com/nest#sponsor" target="_blank"><img src="https://opencollective.com/nest/sponsors/badge.svg" alt="Sponsors on Open Collective" /></a>
+  <a href="https://paypal.me/kamilmysliwiec" target="_blank"><img src="https://img.shields.io/badge/Donate-PayPal-ff3f59.svg"/></a>
+    <a href="https://opencollective.com/nest#sponsor"  target="_blank"><img src="https://img.shields.io/badge/Support%20us-Open%20Collective-41B883.svg" alt="Support us"></a>
+  <a href="https://twitter.com/nestframework" target="_blank"><img src="https://img.shields.io/twitter/follow/nestframework.svg?style=social&label=Follow"></a>
+</p>
+  <!--[![Backers on Open Collective](https://opencollective.com/nest/backers/badge.svg)](https://opencollective.com/nest#backer)
+  [![Sponsors on Open Collective](https://opencollective.com/nest/sponsors/badge.svg)](https://opencollective.com/nest#sponsor)-->
+
+## Description
+
+[Nest](https://github.com/nestjs/nest) framework TypeScript starter repository.
+
+## Installation
+
+```bash
+$ npm install
+```
+
+## Running the app
+
+```bash
+# development
+$ npm run start
+
+# watch mode
+$ npm run start:dev
+
+# production mode
+$ npm run start:prod
+```
+
+## Test
+
+```bash
+# unit tests
+$ npm run test
+
+# e2e tests
+$ npm run test:e2e
+
+# test coverage
+$ npm run test:cov
+```
+
+## Support
+
+Nest is an MIT-licensed open source project. It can grow thanks to the sponsors and support by the amazing backers. If you'd like to join them, please [read more here](https://docs.nestjs.com/support).
+
+## Stay in touch
+
+- Author - [Kamil Myśliwiec](https://kamilmysliwiec.com)
+- Website - [https://nestjs.com](https://nestjs.com/)
+- Twitter - [@nestframework](https://twitter.com/nestframework)
+
+## License
+
+Nest is [MIT licensed](LICENSE).

+{
+  "collection": "@nestjs/schematics",
+  "sourceRoot": "src"
+}

+{
+  "name": "learn-in-web-backend",
+  "version": "0.0.1",
+  "description": "",
+  "author": "",
+  "private": true,
+  "license": "UNLICENSED",
+  "scripts": {
+    "prebuild": "rimraf dist",
+    "build": "nest build",
+    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
+    "start": "nest start",
+    "start:dev": "nest start --watch",
+    "start:debug": "nest start --debug --watch",
+    "start:prod": "node dist/main",
+    "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:cov": "jest --coverage",
+    "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
+    "test:e2e": "jest --config ./test/jest-e2e.json",
+    "migrate:dev": "npx prisma migrate dev",
+    "migrate:dev:create": "npx prisma migrate dev --create-only",
+    "migrate:deploy": "npx prisma migrate deploy",
+    "prisma:generate": "npx prisma generate",
+    "prisma:studio": "npx prisma studio",
+    "prisma:seed": "npx prisma db seed --preview-feature"
+  },
+  "dependencies": {
+    "@nestjs/common": "^8.0.0",
+    "@nestjs/core": "^8.0.0",
+    "@nestjs/jwt": "^8.0.0",
+    "@nestjs/platform-express": "^8.0.0",
+    "@prisma/client": "^3.4.2",
+    "bcrypt": "^5.0.1",
+    "nestjs-prisma": "^0.14.3",
+    "reflect-metadata": "^0.1.13",
+    "rimraf": "^3.0.2",
+    "rxjs": "^7.2.0"
+  },
+  "devDependencies": {
+    "@nestjs/cli": "^8.0.0",
+    "@nestjs/schematics": "^8.0.0",
+    "@nestjs/testing": "^8.0.0",
+    "@types/bcrypt": "^5.0.0",
+    "@types/express": "^4.17.13",
+    "@types/jest": "^27.0.1",
+    "@types/node": "^16.0.0",
+    "@types/supertest": "^2.0.11",
+    "@typescript-eslint/eslint-plugin": "^5.0.0",
+    "@typescript-eslint/parser": "^5.0.0",
+    "eslint": "^8.0.1",
+    "eslint-config-prettier": "^8.3.0",
+    "eslint-plugin-prettier": "^4.0.0",
+    "jest": "^27.2.5",
+    "prettier": "^2.3.2",
+    "prisma": "latest",
+    "source-map-support": "^0.5.20",
+    "supertest": "^6.1.3",
+    "ts-jest": "^27.0.3",
+    "ts-loader": "^9.2.3",
+    "ts-node": "^10.0.0",
+    "tsconfig-paths": "^3.10.1",
+    "typescript": "^4.3.5"
+  },
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "json",
+      "ts"
+    ],
+    "rootDir": "src",
+    "testRegex": ".*\\.spec\\.ts$",
+    "transform": {
+      "^.+\\.(t|j)s$": "ts-jest"
+    },
+    "collectCoverageFrom": [
+      "**/*.(t|j)s"
+    ],
+    "coverageDirectory": "../coverage",
+    "testEnvironment": "node"
+  },
+  "prisma": {
+    "seed": "ts-node prisma/seed.ts"
+  }
+}

+-- CreateEnum
+CREATE TYPE "Level" AS ENUM ('LOW', 'MEDIUM', 'HIGH');
+
+-- CreateEnum
+CREATE TYPE "Role" AS ENUM ('USER', 'ADMIN');
+
+-- CreateTable
+CREATE TABLE "User" (
+    "id" UUID NOT NULL DEFAULT gen_random_uuid(),
+    "email" TEXT NOT NULL,
+    "name" TEXT NOT NULL,
+    "password" TEXT NOT NULL,
+    "role" "Role" NOT NULL DEFAULT E'USER',
+
+    CONSTRAINT "User_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "Post" (
+    "id" UUID NOT NULL DEFAULT gen_random_uuid(),
+    "title" TEXT NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "private" BOOLEAN NOT NULL DEFAULT true,
+    "authorId" UUID NOT NULL,
+    "level" "Level" NOT NULL DEFAULT E'MEDIUM',
+    "content" TEXT NOT NULL,
+
+    CONSTRAINT "Post_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "Comment" (
+    "id" UUID NOT NULL DEFAULT gen_random_uuid(),
+    "content" TEXT NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "authorId" UUID NOT NULL,
+    "postId" UUID NOT NULL,
+
+    CONSTRAINT "Comment_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "User_email_key" ON "User"("email");
+
+-- AddForeignKey
+ALTER TABLE "Post" ADD CONSTRAINT "Post_authorId_fkey" FOREIGN KEY ("authorId") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "Comment" ADD CONSTRAINT "Comment_authorId_fkey" FOREIGN KEY ("authorId") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "Comment" ADD CONSTRAINT "Comment_postId_fkey" FOREIGN KEY ("postId") REFERENCES "Post"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[id]` on the table `Comment` will be added. If there are existing duplicate values, this will fail.
+  - A unique constraint covering the columns `[id]` on the table `Post` will be added. If there are existing duplicate values, this will fail.
+  - A unique constraint covering the columns `[id]` on the table `User` will be added. If there are existing duplicate values, this will fail.
+
+*/
+-- CreateIndex
+CREATE UNIQUE INDEX "Comment_id_key" ON "Comment"("id");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "Post_id_key" ON "Post"("id");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "User_id_key" ON "User"("id");

+# Please do not edit this file manually
+# It should be added in your version-control system (i.e. Git)
+provider = "postgresql"
\ No newline at end of file

+// This is your Prisma schema file,
+// learn more about it in the docs: https://pris.ly/d/prisma-schema
+
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgres"
+  url      = env("DATABASE_URL")
+}
+
+model User {
+  id       String @id @default(dbgenerated("gen_random_uuid()")) @db.Uuid @unique
+  email    String @unique
+  name     String
+  password String
+  role     Role   @default(USER)
+
+  posts    Post[]
+  comments Comment[]
+}
+
+model Post {
+  id        String   @id @default(dbgenerated("gen_random_uuid()")) @db.Uuid @unique
+  title     String 
+  createdAt DateTime @default(now())
+  private   Boolean  @default(true)
+  author    User     @relation(fields: [authorId], references: [id])
+  authorId  String   @db.Uuid
+  level     Level    @default(MEDIUM)
+  content   String
+
+  comments Comment[]
+}
+
+model Comment {
+  id        String   @id @default(dbgenerated("gen_random_uuid()")) @db.Uuid @unique
+  content   String
+  createdAt DateTime @default(now())
+  author    User     @relation(fields: [authorId], references: [id])
+  authorId  String   @db.Uuid
+  post      Post     @relation(fields: [postId], references: [id])
+  postId    String   @db.Uuid
+}
+
+enum Level {
+  LOW
+  MEDIUM
+  HIGH
+}
+
+enum Role {
+  USER
+  ADMIN
+}

+import { Test, TestingModule } from '@nestjs/testing';
+import { AppController } from './app.controller';
+import { AppService } from './app.service';
+
+describe('AppController', () => {
+  let appController: AppController;
+
+  beforeEach(async () => {
+    const app: TestingModule = await Test.createTestingModule({
+      controllers: [AppController],
+      providers: [AppService],
+    }).compile();
+
+    appController = app.get<AppController>(AppController);
+  });
+
+  describe('root', () => {
+    it('should return "Hello World!"', () => {
+      expect(appController.getHello()).toBe('Hello World!');
+    });
+  });
+});

+import { Controller, Get } from '@nestjs/common';
+import { AppService } from './app.service';
+
+@Controller()
+export class AppController {
+  constructor(private readonly appService: AppService) {}
+
+  @Get()
+  getHello(): string {
+    return this.appService.getHello();
+  }
+}

+import { Module } from '@nestjs/common';
+import { AppController } from './app.controller';
+import { AppService } from './app.service';
+import { PrismaModule } from 'nestjs-prisma';
+import { PrismaService } from './prisma.service';
+import { AuthModule } from './auth/auth.module';
+import { Auth } from './auth';
+
+@Module({
+  imports: [PrismaModule, AuthModule],
+  controllers: [AppController],
+  providers: [AppService, PrismaService, Auth],
+})
+export class AppModule {}

+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class AppService {
+  getHello(): string {
+    return 'Hello World!';
+  }
+}

+import { Test, TestingModule } from '@nestjs/testing';
+import { Auth } from './auth';
+
+describe('Auth', () => {
+  let provider: Auth;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [Auth],
+    }).compile();
+
+    provider = module.get<Auth>(Auth);
+  });
+
+  it('should be defined', () => {
+    expect(provider).toBeDefined();
+  });
+});

+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class Auth {}

+import { Test, TestingModule } from '@nestjs/testing';
+import { AuthController } from './auth.controller';
+
+describe('AuthController', () => {
+  let controller: AuthController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [AuthController],
+    }).compile();
+
+    controller = module.get<AuthController>(AuthController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});

+import { Body, Controller, Post } from '@nestjs/common';
+import { AuthService } from './auth.service';
+
+@Controller('auth')
+export class AuthController {
+  constructor(private readonly AuthService: AuthService) {}
+
+  @Post('signup')
+  signUp(@Body() body) {
+    return this.AuthService.createUser(body.name, body.email, body.password);
+  }
+
+  @Post('signin')
+  signIn(@Body() body) {
+    return this.AuthService.login(body.email, body.password);
+  }
+
+  @Post('refresh')
+  refresh(@Body() body) {
+    return this.AuthService.refreshTokens(body.token);
+  }
+
+  @Post('validate')
+  validate(@Body() body) {
+    return this.AuthService.validateUser(body.token);
+  }
+}

+import { Module } from '@nestjs/common';
+import { AuthController } from './auth.controller';
+import { PrismaModule } from 'nestjs-prisma';
+import { AuthService } from './auth.service';
+import { JwtModule, JwtService } from '@nestjs/jwt';
+
+@Module({
+  imports: [PrismaModule, JwtModule.register({ secret: 'secret' })],
+  controllers: [AuthController],
+  providers: [AuthService],
+})
+export class AuthModule {}

+import { Test, TestingModule } from '@nestjs/testing';
+import { AuthService } from './auth.service';
+
+describe('AuthService', () => {
+  let service: AuthService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [AuthService],
+    }).compile();
+
+    service = module.get<AuthService>(AuthService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

+import {
+  BadRequestException,
+  Injectable,
+  NotFoundException,
+} from '@nestjs/common';
+import { PrismaService } from 'nestjs-prisma';
+import { JwtService } from '@nestjs/jwt';
+import { User } from '@prisma/client';
+import * as bcrypt from 'bcrypt';
+
+@Injectable()
+export class AuthService {
+  constructor(
+    private readonly prisma: PrismaService,
+    private readonly jwtService: JwtService,
+  ) {}
+
+  async createUser(name: string, email: string, password: string) {
+    const hashedPassword = await bcrypt.hash(password, 10);
+    const user = await this.prisma.user.create({
+      data: {
+        name,
+        email,
+        password: hashedPassword,
+      },
+    });
+    return this.generateTokens(user);
+  }
+
+  async login(email: string, password: string) {
+    const user = await this.prisma.user.findUnique({ where: { email } });
+
+    if (!user) {
+      throw new NotFoundException('No user found');
+    }
+
+    const passwordMatch = await bcrypt.compare(password, user.password);
+
+    if (!passwordMatch) {
+      throw new BadRequestException('Wrong password');
+    }
+
+    return this.generateTokens(user);
+  }
+
+  validateUser(userId: string): Promise<User> {
+    return this.prisma.user.findUnique({ where: { id: userId } });
+  }
+
+  getUserFromToken(token: string) {
+    const id = this.jwtService.decode(token)['id'];
+    return this.prisma.user.findUnique({ where: { id: id } });
+  }
+
+  generateTokens(user: User) {
+    const payload = {
+      id: user.id,
+      name: user.name,
+      email: user.email,
+    };
+    return {
+      access_token: this.jwtService.sign(payload),
+    };
+  }
+
+  async refreshTokens(token: string) {
+    const _user = await this.getUserFromToken(token);
+    const user = {
+      id: _user.id,
+      name: _user.name,
+      email: _user.email,
+      password: _user.password,
+      role: _user.role,
+    };
+    return this.generateTokens(user);
+  }
+
+  async deleteUser(userId: string) {
+    return this.prisma.user.delete({ where: { id: userId } });
+  }
+
+  async updateUser(token: string, name: string, email: string) {
+    return this.prisma.user.update({
+      where: { id: (await this.getUserFromToken(token)).id },
+      data: {
+        name,
+        email,
+      },
+    });
+  }
+
+  async updatePassword(token: string, password: string) {
+    const hashedPassword = await bcrypt.hash(password, 10);
+    return this.prisma.user.update({
+      where: { id: (await this.getUserFromToken(token)).id },
+      data: {
+        password: hashedPassword,
+      },
+    });
+  }
+
+  async AmIAdmin(token: string) {
+    const user = await this.prisma.user.findUnique({
+      where: { id: (await this.getUserFromToken(token)).id },
+    });
+    if (user.role === 'ADMIN') {
+      return true;
+    } else {
+      return false;
+    }
+  }
+
+  async _changeUserPassword(
+    token: string,
+    userId: string,
+    name?: string,
+    email?: string,
+    password?: string,
+  ) {
+    if (this.AmIAdmin(token)) {
+      const hashedPassword = await bcrypt.hash(password, 10);
+      return this.prisma.user.update({
+        where: { id: userId },
+        data: {
+          name: name,
+          email: email,
+          password: hashedPassword,
+        },
+      });
+    } else {
+      throw new BadRequestException('You are not admin');
+    }
+  }
+
+  // return the newly saved user
+}

+import { NestFactory } from '@nestjs/core';
+import { AppModule } from './app.module';
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule);
+  await app.listen(3000);
+}
+bootstrap();

+import {
+  INestApplication,
+  Injectable,
+  OnModuleInit,
+  OnModuleDestroy,
+} from '@nestjs/common';
+import { PrismaClient } from '@prisma/client';
+
+@Injectable()
+export class PrismaService extends PrismaClient implements OnModuleInit {
+  async onModuleInit() {
+    await this.$connect();
+  }
+
+  async enableShutdownHooks(app: INestApplication) {
+    this.$on('beforeExit', async () => {
+      await app.close();
+    });
+  }
+}

+import { Test, TestingModule } from '@nestjs/testing';
+import { INestApplication } from '@nestjs/common';
+import * as request from 'supertest';
+import { AppModule } from './../src/app.module';
+
+describe('AppController (e2e)', () => {
+  let app: INestApplication;
+
+  beforeEach(async () => {
+    const moduleFixture: TestingModule = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleFixture.createNestApplication();
+    await app.init();
+  });
+
+  it('/ (GET)', () => {
+    return request(app.getHttpServer())
+      .get('/')
+      .expect(200)
+      .expect('Hello World!');
+  });
+});

+{
+  "moduleFileExtensions": ["js", "json", "ts"],
+  "rootDir": ".",
+  "testEnvironment": "node",
+  "testRegex": ".e2e-spec.ts$",
+  "transform": {
+    "^.+\\.(t|j)s$": "ts-jest"
+  }
+}

+{
+  "extends": "./tsconfig.json",
+  "exclude": [
+    "node_modules",
+    "test",
+    "dist",
+    "**/*spec.ts",
+    "prisma"
+  ]
+}
\ No newline at end of file

+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "declaration": true,
+    "removeComments": true,
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "allowSyntheticDefaultImports": true,
+    "target": "es2017",
+    "sourceMap": true,
+    "outDir": "./dist",
+    "baseUrl": "./",
+    "incremental": true,
+    "skipLibCheck": true,
+    "strictNullChecks": false,
+    "noImplicitAny": false,
+    "strictBindCallApply": false,
+    "forceConsistentCasingInFileNames": false,
+    "noFallthroughCasesInSwitch": false
+  }
+}