Add signin, signup functionality

 const jwt = require("jsonwebtoken");
 const bcrypt = require("bcryptjs");
 // handles "exception" inside of async express routes
-// (Used for mongoDB error in this project)
 const asyncHandler = require("express-async-handler");
+const User = require("../models/userModel");
 
 // @desc Signup new user
 // @route POST /api/users
 // @access Public
 const signupUser = asyncHandler(async (req, res) => {
   const { username, email, password } = req.body;
-  if (!name || !email || !password) {
+  if (!username || !email || !password) {
     res.status(400);
     throw new Error("Please fill in all fields");
   }
 
   // Check if user already exists
+  const userExists = await User.findOne({ email });
+  if (userExists) {
+    res.status(400);
+    throw new Error("User with the email already exists");
+  }
 
   // Hash password (bcrypt)
+  const salt = await bcrypt.genSalt(10);
+  const hashedPassword = await bcrypt.hash(password, salt);
 
   // Create/Build user
+  const user = await User.create({
+    username,
+    email,
+    password: hashedPassword,
+  });
 
   // Send response
+  if (user) {
+    // 201: Resource successfully created
+    res.status(201).json({
+      _id: user.id,
+      username: user.username,
+      email: user.email,
+      // TODO: Add token!
+    });
+  } else {
+    res.status(400);
+    throw new Error("Invalid user data");
+  }
 });
 
+// @desc Login user
+// @route POST /api/users/login
+// @access Public
 const loginUser = asyncHandler(async (req, res) => {
   const { email, password } = req.body;
 
-  // Check for the user email
-
-  // Send response
+  // Check email & password
+  const userInDB = await User.findOne({ email });
+  const validPassword = await bcrypt.compare(password, userInDB.password);
+  if (userInDB && validPassword) {
+    res.status(200).json({
+      _id: userInDB.id,
+      username: userInDB.username,
+      email: userInDB.email,
+      // TODO: Add Token!
+    });
+  } else {
+    res.status(400);
+    throw new Error("Invalid credentials");
+  }
 });
 
+// @desc Get user(only self)
+// @route GET /api/users/self
+// @access Private
 const getSelf = asyncHandler(async (req, res) => {});
 
 module.exports = {

+const jwt = require("jsonwebtoken");
+
+const authHandler = (err, req, res, next) => {
+  next();
+};
+
+module.exports = { authHandler };

@@ -4,7 +4,7 @@ const errorHandler = (err, req, res, next) => {
   res.status(statusCode);
   res.json({
     message: err.message,
-    // stack from mongoDB (maybe...)
+    // stack from mongoDB TODO: Check it!
     stack: process.env.NODE_ENV === "production" ? null : err.stack,
   });
 };

@@ -10,6 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "bcryptjs": "^2.4.3",
+        "colors": "^1.4.0",
         "dotenv": "^16.0.1",
         "express": "^4.18.1",
         "express-async-handler": "^1.2.0",
@@ -457,6 +458,14 @@
       "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
       "dev": true
     },
+    "node_modules/colors": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/colors/-/colors-1.4.0.tgz",
+      "integrity": "sha512-a+UqTh4kgZg/SlGvfbzDHpgRu7AAQOmmqRHJnxhRZICKFUT91brVhNNt58CMWU9PsBbv3PDCZUHbVxuDiH2mtA==",
+      "engines": {
+        "node": ">=0.1.90"
+      }
+    },
     "node_modules/concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -2591,6 +2600,11 @@
       "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
       "dev": true
     },
+    "colors": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/colors/-/colors-1.4.0.tgz",
+      "integrity": "sha512-a+UqTh4kgZg/SlGvfbzDHpgRu7AAQOmmqRHJnxhRZICKFUT91brVhNNt58CMWU9PsBbv3PDCZUHbVxuDiH2mtA=="
+    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",

@@ -5,7 +5,7 @@
   "main": "server.js",
   "scripts": {
     "start": "node server.js",
-    "dev": "nodemon server.js"
+    "server": "nodemon server.js"
   },
   "repository": {
     "type": "git",
@@ -15,6 +15,7 @@
   "license": "MIT",
   "dependencies": {
     "bcryptjs": "^2.4.3",
+    "colors": "^1.4.0",
     "dotenv": "^16.0.1",
     "express": "^4.18.1",
     "express-async-handler": "^1.2.0",

 const express = require("express");
 const router = express.Router();
-const { signupUser, loginUser } = require("../actions/userActions");
+const { signupUser, loginUser, getSelf } = require("../actions/userActions");
 
 router.post("/", signupUser);
 router.post("/login", loginUser);
+router.get("/self", getSelf);
 
 module.exports = router;

@@ -2,7 +2,7 @@ const express = require("express");
 const dotenv = require("dotenv").config();
 const { errorHandler } = require("./middleware/errorMiddleware");
 const connectDB = require("./config/db");
-const port = process.env.PORT || 8000;
+const port = process.env.PORT || 6000;
 
 connectDB();
 const app = express();