Assignment for Backend

index.js

@@ -1,4 +1,8 @@
-const express = require('express')
+import express from 'express';
+import bcrypt from 'bcrypt';
+import jwt from 'jsonwebtoken';
+import cookieParser from 'cookie-parser'
+
 const app = express()
 const port = 3001
 
@@ -17,56 +21,163 @@ const QUESTIONS = [{
 const SUBMISSION = [
 
 ]
+const SECERET_KEY = 'IUBGYF6KN@HVHG$hjjhb8'
+
+const generateJsonWebToken = async (email) =>{
+  try {
+    const token = await jwt.sign({email},SECERET_KEY,{expiresIn:'1d'})
+    return token;
+  } catch (error) {
+    return error
+  }
+}
+
+const VerfiyJWT = async(req,res,next)=>{
+  try {
+    const token = req.cookies?.token 
+    if (!token) {
+      return res.status(400).json({message:'Response token is expired or not found please login again'})
+    }
+    const details = await jwt.verify(token,SECERET_KEY)
+    const user = USERS.find(user => details?.email === user.email)
+    if (!user) {
+      return res.status(400).json({message:"Please login"})
+    }
+    req.user = user
+    next();
+  } catch (error) {
+    return res.status(400).json(error.message || 'Something went wrong while VerifyingJWT')
+  }
+}
+
+app.use(express.json({limit:'1mb'}))
+app.use(cookieParser())
+
+app.get('/users',(req,res)=>{
+  res.status(200).json({USERS,message:"All users"})
+})
 
-app.post('/signup', function(req, res) {
+app.post('/signup', async function(req,res) {
   // Add logic to decode body
+  const { email, password } = req.body
   // body should have email and password
-
+  if (!email || !password) {
+    return res.status(400).json({})
+  }
 
   //Store email and password (as is for now) in the USERS array above (only if the user with the given email doesnt exist)
-
-
+
+
+  const findUser = USERS.find(user => user.email === email)
+  if (findUser) {
+    return res.status(400).json({message:"Email already exist in the database please login"})
+  }
+  const hashPassword = await bcrypt.hash(password,10)
+  const addUser ={
+    email,
+    password:hashPassword,
+    admin:true
+  }
+  USERS.push(addUser)
   // return back 200 status code to the client
-  res.send('Hello World!')
+  return res.status(200).json({message:"User Created Please login"})
 })
 
-app.post('/login', function(req, res) {
+app.post('/login', async function(req, res) {
   // Add logic to decode body
+  const {email,password} = req.body
   // body should have email and password
-
+  if (!email || !password) {
+    return res.status(400).json({message:"Please provide credentials"})
+  }
   // Check if the user with the given email exists in the USERS array
+  const userFound = USERS.find(user=>user.email === email)
+
+  if (!userFound) {
+    return res.status(400).json({message:"Email not found please signUp"})
+  }
   // Also ensure that the password is the same
-
-
+  const comparePassword = await bcrypt.compare(password,userFound.password)
+  if (!comparePassword) {
+    return res.status(400).json({message:"Incorrect Password"})
+  }
+  const token = await generateJsonWebToken(email)
+  const optionHeader = {
+    httpOnly:true,
+    secure:true
+  }
+  res.cookie('token',token,optionHeader)
+  return res
+  .status(200)
+  .json({token,message:"Token sent to the user"})
   // If the password is the same, return back 200 status code to the client
   // Also send back a token (any random string will do for now)
   // If the password is not the same, return back 401 status code to the client
-
-
-  res.send('Hello World from route 2!')
 })
 
 app.get('/questions', function(req, res) {
 
   //return the user all the questions in the QUESTIONS array
-  res.send("Hello World from route 3!")
+  return res.status(200).send(QUESTIONS)
 })
 
-app.get("/submissions", function(req, res) {
+app.get("/submissions", VerfiyJWT,function(req, res) {
    // return the users submissions for this problem
-  res.send("Hello World from route 4!")
+  const user = req.user
+  const findSubmission = SUBMISSION.filter(sub=>sub.user === user.email) 
+  if (!findSubmission) {
+    return res.status(400).json({message:"Not able to find Any submission"})
+  }
+  return res.status(200).json({findSubmission,message:"fetched all Data"})
 });
 
 
-app.post("/submissions", function(req, res) {
+app.post("/submissions", VerfiyJWT ,function(req, res) {
    // let the user submit a problem, randomly accept or reject the solution
+    const { code, QuestionTitle } = req.body
+    if (!QuestionTitle) {
+      return res.status(400).json({message:"Question not found"})
+    }
+    if (!code) {
+      return res.status(400).json({message:"code not found"})
+    }
+    const answer = Math.random() > 0.5
    // Store the submission in the SUBMISSION array above
-  res.send("Hello World from route 4!")
+    const addSubmit = {
+      user:req.user.email,
+      Answer: answer?'Ac':'Wa',
+      code,
+      QuestionTitle
+    }
+    SUBMISSION.push(addSubmit)
+    return res.status(200).json({addSubmit,message:"Added to Submission"})
 });
 
 // leaving as hard todos
 // Create a route that lets an admin add a new problem
 // ensure that only admins can do that.
+app.post('/addproblem',VerfiyJWT,(req,res)=>{
+  const { title, description, testCases } = req.body
+  if (! title || !description || !testCases ) {
+    return res.status(400).json({message:"Please give All fields"})
+  }
+  const adminCheck = USERS.find(user => user.email === req.user.email)
+  if (!adminCheck.admin) {
+    return res.status(400).json({message:"You are not admin"})
+  }
+  const addQ = {
+    title,
+    description,
+    testCases
+  }
+  QUESTIONS.push(addQ)
+  return res.status(200).json({
+    title,
+    description,
+    testCases,
+    message:"Added to the System"
+  })
+})
 
 app.listen(port, function() {
   console.log(`Example app listening on port ${port}`)