First commit

+node_modules
+package-lock.json
+yarn.lock
\ No newline at end of file

+var express = require('express');
+var app = express();
+var bodyParser = require('body-parser');
+var session = require('express-session')
+
+app.use(session({
+    secret: 'keyboard cat',
+    cookie: {
+        maxAge: 60000
+    }
+}))
+app.use(bodyParser.urlencoded({
+    extended: false
+}));
+app.use(bodyParser.json());
+var users = new Array();
+
+users[0] = {
+    "userId": 0,
+    "name": "jin",
+    "password": "abc",
+    "isAdmin": true
+}
+
+app.put('/login', function (req, res) {
+    // users 배열에서 찾도록 처리 해야 함
+    // admin 여부를 확인하여 체크
+    // req.body.id : ID
+    // req.body.name : 패스워드
+    const user = req.body;
+    for (var i = 0; i < users.length; i++) {
+        if (users[i].userId == user.userId && users[i].password == user.password) {
+            req.session.userId = users[i].userId;
+            req.session.isAdmin = users[i].isAdmin;
+            res.send("Login");
+            return;
+        }
+    }
+
+    res.send("Login Failed");
+    return;
+
+});
+
+app.put('/logout', function (req, res) {
+    // Logout
+    // 세션 유효 여부를 체크하고 세션 Delete
+
+    if (!users[req.session.userId]) {
+        res.send("Error!");
+        return ;
+    }
+
+    req.session.userId = null;
+    req.session.isAdmin = null;
+    res.send("LogOut");
+    return ;
+});
+
+
+var auth = function (req, res, next) {
+    // Session Check
+    // 어드민 여부 체크 필요
+    console.log(req.session.userId, req.session.isAdmin);
+    if (req.session.userId != null && req.session.isAdmin == true)
+        next();
+    else
+        res.send("Not Admin");
+
+    return ;
+};
+
+app.get('/users/:userId', auth, function (req, res) {
+    // get User Information
+    const user = req.params;
+    for (var i = 0; i < users.length; i++) {
+        if (users[i].userId == user.userId) {
+            res.send(users[i]);
+            return ;
+        }
+    }
+    
+    res.send("Not exist user");
+    return ;
+});
+
+app.put('/users', auth, function (req, res) {
+    const user = req.body;
+    for (var i = 0; i < users.length; i++) {
+        if (users[i].userId == user.userId) {
+            users[i] = {
+                "userId": user.userId,
+                "name": user.name,
+                "password": user.password,
+                "isAdmin": user.isAdmin
+            }
+            res.send("Updated");
+            return ;
+        }
+    }
+    
+    res.send("Not exist user");
+    return ;
+});
+
+app.post('/users', auth, function (req, res) {
+    user = req.body;
+    users[user.userId] = {
+        "userId": user.userId,
+        "name": user.name,
+        "password": user.password,
+        "isAdmin": user.isAdmin
+    }
+    res.send("Added");
+});
+
+app.delete('/users/:userId', auth, function (req, res) {
+    const user = req.params;
+    for (var i = 0; i < users.length; i++) {
+        if (users[i].userId == user.userId) {
+            users.splice(i,1);
+            res.send("Deleted");
+            return ;
+        }
+    }
+    res.send("Not exist user");
+    return ;
+});
+
+// 사용자 추가 시에 admin 여부도 추가해야 함
+var server = app.listen(80);
\ No newline at end of file

+{
+  "name": "node.js-express-assignment2",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "dependencies": {
+    "express": "^4.17.1",
+    "express-session": "^1.17.1"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC"
+}