nestjs实现图形校验和单点登录的示例代码（nestjs社区）万万没想到

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目录实现图形校验和单点登录前置条件安装Moduleservice如何生成图形验证码如何使用 session接入 mongose

效果图

学习一下 nest

新建项目

npm i -g @nestjs/cli
nest new project-name
npm run start:dev //启动服务

目录结构

controllers

负责处理传入的请求并将响应返回给客户端。(定义路由等)

import { Controller, Get } from ‘@nestjs/common’;
@Controller()
export class AppController {
constructor() {}
@Get()
getHello(): string {
return ‘hello world’;
}
}

controllers 常用装饰器

常用装饰器

@Controller(path)@Get(path)@Post(path)@Request(), @Req()@Response(), @Res()@Session()@Param(key?: string)@Body(key?: string)@Query(key?: string)@Headers(name?: string)定义 root 路径定义 get 请求和路径定义 post 请求和路径请求体(req)响应体(res)session获取 req.params 参数获取 req.body 参数获取 req.query 参数获取 req.headers 参数

@Global()
@Module({
providers: [MyService],
exports: [MyService],
})
export class AppModule {}

providers 属性用来声明模块所提供的依赖注入 (DI) 提供者，它们将在整个模块中共享。exports 属性用于导出模块中的提供者以供其他模块使用。global 标识符用于创建一个全局模块。在任何地方都可以使用 @Inject() 装饰器来注入其提供者。imports 选项用于引入其他模块中提供的依赖关系。

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

业务逻辑具体实现

需要用到 svg-captcha 这个库

npm i svg-captcha

nest 命令行创建一个 captcha 模块nest g res captchanest 命令行:

import { Controller, Get, Response, Session } from ‘@nestjs/common’;
import * as svgCaptcha from ‘svg-captcha’;
@Controller(‘captcha’)
export class CaptchaController {
@Get()
async getCaptcha(@Response() res, @Session() session) {
const captcha=svgCaptcha.create({
size: 4,
noise: 2,
});
session.captcha=captcha.text;
res.type(‘svg’);
res.send(captcha.data);
}
}

通过 session 将当前会话的 captcha 存起来此时能通过：http://localhost:3000/captcha查看到效果图

npm i express-session
npm i -D @types/express-session

并且再 main.ts 中引入

import * as session from ‘express-session’;
// somewhere in your initialization file
app.use(
session({
secret: ‘my-secret’,
resave: false,
saveUninitialized: false,
}),
);

在本机下载 mogodb mogodb 官网下载

安装 mongoose

npm install –save mongoose

在 app.modele 中引入

import { Module } from ‘@nestjs/common’;
import { MongooseModule } from ‘@nestjs/mongoose’;
import { AppController } from ‘https://www.jb51.net/article/app.controller’;
import { AppService } from ‘https://www.jb51.net/article/app.service’;
@Module({
imports: [MongooseModule.forRoot(‘mongodb://127.0.0.1:27017/nest’)],
controllers: [AppController],
providers: [AppService],
})
export class AppModule {}

创建 schemas

import { Document } from ‘mongoose’;
import * as mongoose from ‘mongoose’;
export interface User {
account: string;
password: string;
}
export interface UserDoc extends User, Document {}
export const UserSchema=new mongoose.Schema({
password: { type: String, required: true },
account: {
type: String,
required: true,
unique: true,
},
});
export const UserModel=mongoose.model<UserDoc>(‘User’, UserSchema);

创建 auth 模块

nest g res auth

实现注册和登录方法controller

import {
Controller,
Get,
Body,
Post,
UseInterceptors,
Req,
Request,
Res,
} from ‘@nestjs/common’;
import { AuthService } from ‘https://www.jb51.net/article/auth.service’;
import { CreateUserDto } from ‘https://www.jb51.net/article/dto/index’;
import { ApiCreatedResponse } from ‘@nestjs/swagger’;
import { CaptchaMiddleware } from ‘src/middleware/captcha-middleware/captcha-middleware.middleware’;
@Controller(‘auth’)
export class AuthController {
constructor(private readonly authService: AuthService) {}
@ApiCreatedResponse({
description: ‘The record has been successfully created.’,
type: CreateUserDto,
})
@Post(‘register’)
async created(@Body() data: CreateUserDto) {
const user=await this.authService.created(data);
return user;
}
@UseInterceptors(CaptchaMiddleware)
@Post(‘login’)
async login(
@Body() data: CreateUserDto,
@Req() request: Request,
@Res() res,
) {
const user=await this.authService.login(data, request);
res.sendResponse(user);
}
}

引入uuid 生成随机数和userId做键值对映射,为单点登录打下基础。

引入jwt 生成token进行校验。

import { Injectable, UnauthorizedException } from ‘@nestjs/common’;
import { JwtService } from ‘@nestjs/jwt’;
import mongoose, { Model } from ‘mongoose’;
import { InjectModel } from ‘@nestjs/mongoose’;
import { UserDoc } from ‘https://www.jb51.net/schemas/user.schema’;
import { loginMapDoc } from ‘https://www.jb51.net/schemas/login.mapping’;
import { CreateUserDto } from ‘https://www.jb51.net/article/dto/index’;
import { v4 as uuid } from ‘uuid’;
@Injectable()
export class AuthService {
constructor(
private jwtService: JwtService,
@InjectModel(‘user’) private readonly userModel: Model<UserDoc>,
@InjectModel(‘loginmapModel’)
private readonly loginmapModel: Model<loginMapDoc>,
) {}
async created(data: CreateUserDto) {
const user=await new this.userModel(data);
return user.save();
}
async login(data: any, req) {
const { account, password, code }=data;
if (code.toLocaleLowerCase() !==req.session?.captcha.toLocaleLowerCase()) {
return {
code: 400,
message: ‘验证码错误’,
};
}
const user=await this.userModel.findOne({
account,
password,
});
if (!user) {
throw new UnauthorizedException();
}
const loginId=uuid();
const payload={
userId: user.id,
username: user.account,
loginId: loginId,
};
const token=this.jwtService.sign(payload);
const foundCollection=await mongoose.connection.collections[
‘loginmapModel’
];
if (!foundCollection) {
// 如果该 collection 不存在，则创建它
await new this.loginmapModel();
console.log(‘新建成功’);
}
await this.loginmapModel.findOneAndUpdate(
{ userId: user.id },
{ userId: user.id, loginId },
{ upsert: true, new: true, runValidators: true },
);
return { token, loginId };
}
async viladate(data: any) {
const { userId, loginId }=data;
const map=await this.loginmapModel.findOne({ userId, loginId });
return loginId==map.loginId;
}
}

最后创建一个guard,对用户是否登录进行拦截判断

nest g gu middleware/auth

import {
CanActivate,
ExecutionContext,
Injectable,
Request,
UnauthorizedException,
} from ‘@nestjs/common’;
import { Reflector } from ‘@nestjs/core’;
import { JwtService } from ‘@nestjs/jwt’;
import { jwtConstants } from ‘@/auth/constants’;
import { AuthService } from ‘@/auth/auth.service’;
@Injectable()
export class AuthGuardGuard implements CanActivate {
constructor(
private jwtService: JwtService,
private reflector: Reflector,
private authService: AuthService,
) {}
async canActivate(context: ExecutionContext): Promise<boolean> {
const skipAuth=this.reflector.get<boolean>(
‘skipAuth’,
context.getHandler(),
); // 返回 Boolean 值或 undefined，即是否跳过校验
if (skipAuth) {
return true;
}
const request: Request=context.switchToHttp().getRequest();
const token=this.extractTokenFromHeader(request);
if (!token) {
throw new UnauthorizedException();
}
try {
const payload=await this.jwtService.verifyAsync(token, {
secret: jwtConstants.secret,
});
const isRemoteLogin=await this.authService.viladate(payload);
console.log(isRemoteLogin, ‘payload’, payload);
if (!isRemoteLogin) {
throw new UnauthorizedException(‘异地登录’);
}
// We’re assigning the payload to the request object here
// so that we can access it in our route handlers
request[‘user’]=payload;
} catch {
throw new UnauthorizedException();
}
return true;
}
private extractTokenFromHeader(request: any): string | undefined {
const [type, token]=request.headers.authorization?.split(‘ ‘) [];
return type===’Bearer’ ? token : undefined;
}
}

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