deno-auth-server.ts

import { Application, Router } from "https://deno.land/x/oak/mod.ts";
import { MongoClient } from "https://deno.land/x/mongo@v0.7.0/mod.ts";
import * as bcrypt from "https://deno.land/x/bcrypt/mod.ts";
import { v4 } from "https://deno.land/std/uuid/mod.ts";



// Database Connection.
const client = new MongoClient();
client.connectWithUri("mongodb://localhost:27017");
const db    = client.database("test");
const users = db.collection("users");



// User Register API
const registerUser = async (
  {request,response}:{request:any; response:any }
)=>{
  
  const body    = await request.body();
  const user    = body.value;
  let userExist =  await users.findOne({email:user.email})
  if(userExist){
    response.body = {
      error:'Email already exist'
    }
  }else{
    const salt:any      = v4.generate();
    const hashePswd:any = await bcrypt.hash(user.password, salt);
    await users.insertOne({
      name:     user.name,
      email:    user.email,
      password: hashePswd
  })
    response.body = {message:"Registration Success"};
    response.status = 200;
  }
}


// User Login API
const loginUser = async (
  {request,response}:{request:any; response:any}
) =>{
  const body = await request.body();
  const user = body.value;
  var loggedUser  = await users.findOne({email:user.email})
  if(!loggedUser){
    response.body = {
      error:"Email not found"
    }
  }
  
  var validPswd   = await bcrypt.compare(user.password, loggedUser.password)
  if(!validPswd){
    response.body = {
      error:'Invalid Password'
    }
  }
  else{
    response.body = {
      message:"Login Success"
    }
  }
}

// Add API for Updating and deletaing a User


// Get All Users 
const getAllUsers = async ({response}:{response:any})=>{
  let data      = await users.find()
  response.body = data
}


// Server
const router = new Router()
const app    = new Application();
const PORT   = 8080;

router
    .post("/register", registerUser)
    .post("/login",    loginUser)
    .get("/users",   getAllUsers)

app.use(router.routes());
app.use(router.allowedMethods());

await app.listen({ port: PORT });