commit 5535c9c2e99182a6ff50ff79fe1918a86d26ef38
Author: Adolfo Reyna <adolforeyna@Adolfos-Mac-mini.local>
Date:   Sun Jul 18 16:48:25 2021 -0700

    initial commit, authentication

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2f11a24
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,232 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..6de3a3b
--- /dev/null
+++ b/index.js
@@ -0,0 +1,136 @@
+require('dotenv').config();
+const express = require('express');
+const path = require('path');
+const app = express();
+const port = process.env.PORT || 3000;
+const bodyParser = require('body-parser');
+const cookieParser = require('cookie-parser');
+
+app.use(bodyParser.json());
+app.use(bodyParser.urlencoded({ extended: true }));
+app.use(cookieParser());
+
+const bcrypt = require('bcrypt');
+const crypto = require('crypto');
+const DB = require("./mongoDB.js");
+
+// Utilities
+const getSessionId = function(req){
+    const session_id = req.cookies.session_id || req.query.session_id || req.body.session_id;
+    return session_id
+}
+const getUserId = function(req){
+    const user_sid = req.cookies.user_sid || req.query.user_sid || req.body.user_sid;
+    return user_sid
+}
+
+DB.getDB.then((DB)=>{
+
+    // middleware function to check for logged-in users
+    const sessionChecker = async (req, res, next) => {
+        const session_id = getSessionId(req);
+        const user_sid = getUserId(req);
+        if (session_id && user_sid) {
+            const userInfo = await DB.checkSessionOnDB(session_id, user_sid);
+            req.userInfo = userInfo;
+            if(!userInfo) return res.redirect('/login');
+            next();          
+        } else {
+            return res.redirect('/login');
+        }
+    };
+
+    // route for Home-Page
+    app.get('/', sessionChecker, async (req, res) => {
+        if(req.userInfo) return res.json({status: "ok", userInfo: req.userInfo});
+        res.json({status: "ok"});
+    });
+
+    // route for user signup
+    const signup = async function(req, res){
+        const username = req.query.username || req.body.username;
+        const password = req.query.password || req.body.password;
+        const email = req.query.email || req.body.email;
+        if(!username || !password || !email) return res.json({status: "fail"})
+        const hashedPassword = await bcrypt.hash(password, 10);
+        const success = await DB.newUser({
+            username: username,
+            email: email,
+            password: hashedPassword
+        });
+        if(success){
+            return login(req, res);
+        }
+        res.redirect('/signup');
+    }
+    app.route('/signup').get(async (req, res) => {
+        return await signup(req, res);
+    }).post(async (req, res) => {
+        return await signup(req, res);
+    });
+
+    const cookiesOptions = {
+        maxAge: 1000 * 60 * 60 * 24 * 30, // would expire after 30 days
+        httpOnly: true, // The cookie only accessible by the web server
+        //signed: true // Indicates if the cookie should be signed
+    };
+
+    // route for user Login
+    const login = async function(req, res){
+        const session_id = getSessionId(req);
+        const user_sid = getUserId(req);
+        if (session_id && user_sid) {
+            const userInfo = await DB.checkSessionOnDB(session_id, user_sid);
+            if(userInfo) return res.redirect('/');
+        }
+        const username = req.body.username || req.query.username;
+        const password = req.body.password || req.query.password || "";
+        const user = await DB.getUser(username);
+        if (!user) return res.json({status: "user not founded"});
+        const samePass = await bcrypt.compare(password, user.password);
+        if(!samePass) return res.json({status: "incorrect password"});
+        const doc = await DB.newSession(user._id);
+        res.cookie('user_sid', user._id, cookiesOptions);
+        res.cookie('session_id', doc.insertedId, cookiesOptions);
+        return res.json({
+            status: "ok",
+            user_sid: user._id,
+            session_id: doc.insertedId
+        });
+    }
+    app.route('/login').get(async (req, res) => {
+        return await login(req, res);
+    }).post(async (req, res) => {
+        return await login(req, res);       
+    });
+
+    // route for user logout
+    const logout = function(req, res){
+        const session_id = getSessionId(req);
+        const user_sid = getUserId(req);
+        if (session_id && user_sid) {
+            res.clearCookie('session_id');
+            res.clearCookie('user_sid');
+            //remove from DB
+            DB.removeSession(session_id);
+            res.redirect('/');
+        } else {
+            res.redirect('/login');
+        }
+    }
+    app.get('/logout', (req, res) => {
+        return logout(req, res);
+    });
+
+    // route for handling 404 requests(unavailable routes)
+    app.use(function (req, res, next) {
+        res.status(404).send("Sorry can't find that!")
+    });
+
+    app.listen(port, () => {
+        console.log(`Example app listening at http://localhost:${port}`);
+    });
+}).catch((err)=>{
+    throw err;
+});
+
diff --git a/mongoDB.js b/mongoDB.js
new file mode 100644
index 0000000..efa8c86
--- /dev/null
+++ b/mongoDB.js
@@ -0,0 +1,54 @@
+const mongo = require('mongodb');
+const MongoClient = mongo.MongoClient;
+const DBName = "EMI_SOCIAL";
+const mongoUrl = process.env.MONGO_URL
+
+
+const getDB = new Promise((resolve, reject) => {
+    const DB = {ObjectID: mongo.ObjectID};
+    MongoClient.connect(mongoUrl, function(err, db) {
+        if (err) return reject(err);
+    
+        DB.db = db;
+        console.log("Connected to DB!");
+        DB.usersCol = db.db(DBName).collection("users");
+        DB.tokensCol = db.db(DBName).collection("AmArr5EHx7sn3Gr");
+    
+        DB.checkSessionOnDB = async (session_id, user_sid)=>{
+            const temp_id = new mongo.ObjectID(session_id);
+            //We can add cache, like a temporary Redis entry, to avoid calling the DB on each call
+            const doc = await DB.tokensCol.findOne({"_id":temp_id});
+            if(doc && doc.uid == user_sid){
+                const userMongoId = new mongo.ObjectID(user_sid);
+                const userInfo = await DB.usersCol.findOne({"_id": userMongoId}, {fields: {password: 0}});
+                return userInfo;
+            }
+            return false;
+        };
+
+        DB.getUser = (username)=>{
+            return DB.usersCol.findOne({ username: username });
+        }
+
+        DB.newUser = (userInformation)=>{
+            console.log("NewUser", userInformation);
+            return DB.usersCol.insertOne(userInformation).catch((err)=>{
+                console.log(err);
+                return false;
+            });
+        };
+
+        DB.newSession = (user_id)=>{
+            return DB.tokensCol.insertOne({uid: user_id});
+        }
+
+        DB.removeSession = (session_id)=>{
+            const temp_id = new mongo.ObjectID(session_id);
+            return DB.tokensCol.deleteOne({"_id":temp_id});
+        }
+    
+        resolve(DB);
+    });
+});
+
+exports.getDB = getDB;
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..3ee7329
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2023 @@
+{
+  "name": "emi_backend",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "emi_backend",
+      "version": "1.0.0",
+      "license": "ISC",
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+        "body-parser": "^1.19.0",
+        "cookie-parser": "^1.4.5",
+        "dotenv": "^8.2.0",
+        "express": "^4.17.1",
+        "mongodb": "^3.6.3"
+      }
+    },
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..86fdfe4
--- /dev/null
+++ b/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "emi_backend",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "bcrypt": "^5.0.0",
+    "body-parser": "^1.19.0",
+    "cookie-parser": "^1.4.5",
+    "dotenv": "^8.2.0",
+    "express": "^4.17.1",
+    "mongodb": "^3.6.3"
+  }
+}