cat-backend-nodejs · AmrBedir · May 17, 2024
diff --git a/app.js b/app.js
@@ -3,11 +3,25 @@ const express = require('express');
 const path = require('path');
 const cookieParser = require('cookie-parser');
 const logger = require('morgan');
+const mongoose = require('mongoose');
 
 const indexRouter = require('./routes/index');
+const dbUrl = 'mongodb://localhost:27017/url-shortener';
 
 const app = express();
 
+// Connect to database
+mongoose.connect(dbUrl, {
+    useNewUrlParser: true,
+    useUnifiedTopology: true,
+})
+    .then(() => {
+        console.log('Connected to database');
+    })
+    .catch((err) => {
+        console.error('Database connection error:', err.message);
+    });
+
 // view engine setup
 app.set('views', path.join(__dirname, 'views'));
 app.set('view engine', 'ejs');
@@ -21,12 +35,12 @@ app.use(express.static(path.join(__dirname, 'public')));
 app.use('/', indexRouter);
 
 // catch 404 and forward to error handler
-app.use(function (req, res, next) {
+app.use((req, res, next) => {
     next(createError(404));
 });
 
 // error handler
-app.use(function (err, req, res, next) {
+app.use((err, req, res, next) => {
     // set locals, only providing error in development
     res.locals.message = err.message;
     res.locals.error = req.app.get('env') === 'development' ? err : {};

diff --git a/models/urlModel.js b/models/urlModel.js
@@ -0,0 +1,18 @@
+const mongoose = require('mongoose');
+const Schema = mongoose.Schema;
+
+const urlSchema = new Schema({
+    longUrl: {
+        type: String,
+        required: true
+    }, 
+    alias: {
+        type: String,
+        required: true,
+        unique: true
+    }
+}, { timestamps: true });
+
+const Url = mongoose.model('Url', urlSchema);
+
+module.exports = Url;
diff --git a/package.json b/package.json
@@ -6,14 +6,15 @@
     "start": "node ./bin/www"
   },
   "dependencies": {
-    "cookie-parser": "~1.4.4",
-    "debug": "~2.6.9",
-    "ejs": "^3.1.9",
-    "express": "^4.18.2",
-    "http-errors": "~1.6.3",
-    "morgan": "~1.9.1"
+    "cookie-parser": "^1.4.5",
+    "debug": "^4.3.2",
+    "ejs": "^3.1.6",
+    "express": "^4.17.1",
+    "http-errors": "^1.8.0",
+    "mongoose": "^6.0.7",
+    "morgan": "^1.10.0"
   },
   "devDependencies": {
-    "nodemon": "^3.0.1"
+    "nodemon": "^2.0.12"
   }
 }
diff --git a/routes/index.js b/routes/index.js
@@ -1,8 +1,79 @@
-const router = require('express').Router();
+const express = require('express');
+const router = express.Router();
+const Url = require('../models/urlModel');
+
+/* GET a page with alias. */
+router.get('/:alias', async function (req, res, next) {
+    try {
+        const alias = req.params.alias;
+        const url = await Url.findOne({ alias: alias });
+        if (url) {
+            res.redirect(url.longUrl);
+        } else {
+            res.status(404).send('404 Not Found');
+        }
+    } catch (err) {
+        next(err);
+    }
+});
 
 /* GET home page. */
-router.get('/', function (req, res, next) {
-    res.render('index', { title: 'Express' });
+router.get('/', async function (req, res, next) {
+    try {
+        const urls = await Url.find({});
+        res.locals.urls = urls;
+        res.locals.domain = `${req.protocol}://${req.get('host')}/`;
+        res.render('index', { title: 'Express' });
+    } catch (err) {
+        next(err);
+    }
+});
+
+// Middleware to validate alias
+const validator = function (req, res, next) {
+    const regex = /^[a-zA-Z0-9_]+$/;
+    if (req.body.aliasInput.length > 3 && regex.test(req.body.aliasInput)) {
+        next();
+    } else {
+        res.status(400).render('invalid');
+    }
+};
+
+// Middleware to check availability
+const available = async function (req, res, next) {
+    try {
+        if (await Url.findOne({ alias: req.body.aliasInput })) {
+            res.status(400).render('not-available');
+        } else {
+            next();
+        }
+    } catch (err) {
+        next(err);
+    }
+};
+
+/* POST new url shortener from home page */
+router.post('/', validator, available, async (req, res, next) => {
+    try {
+        const url = new Url({
+            longUrl: req.body.urlInput,
+            alias: req.body.aliasInput,
+        });
+        await url.save();
+        res.redirect('/');
+    } catch (err) {
+        next(err);
+    }
+});
+
+/* DELETE a shortened URL */
+router.get('/:id/delete', async (req, res, next) => {
+    try {
+        await Url.findByIdAndDelete(req.params.id);
+        res.redirect('/');
+    } catch (err) {
+        next(err);
+    }
 });
 
 module.exports = router;
diff --git a/views/index.ejs b/views/index.ejs
@@ -18,13 +18,20 @@
 
         .form-container {
             margin-bottom: 20px;
+            text-align: center;
+        }
+
+        .form-container label {
+            display: block;
+            margin-bottom: 5px;
         }
 
         .form-container input[type="text"] {
             width: 300px;
             height: 30px;
             padding: 5px;
             font-size: 14px;
+            margin-right: 10px;
         }
 
         .form-container input[type="submit"] {
@@ -37,9 +44,14 @@
             cursor: pointer;
         }
 
+        .form-container input[type="submit"]:hover {
+            background-color: #45a049;
+        }
+
         table {
             border-collapse: collapse;
             width: 100%;
+            margin-top: 20px;
         }
 
         th,
@@ -53,6 +65,22 @@
             background-color: #4CAF50;
             color: white;
         }
+
+        td form {
+            margin: 0;
+        }
+
+        button {
+            background-color: #e74c3c;
+            color: white;
+            border: none;
+            padding: 5px 10px;
+            cursor: pointer;
+        }
+
+        button:hover {
+            background-color: #c0392b;
+        }
     </style>
 </head>
 
@@ -71,24 +99,28 @@
 
     <div class="table-container">
         <table id="urlTable">
-            <tr>
-                <th>Original URL</th>
-                <th>Shortened URL</th>
-            </tr>
-            <tr>
-                <td><a href="https://github.com/cat-backend-nodejs/nodejs-roadmap">https://github.com/cat-backend-nodejs/nodejs-roadmap</a></td>
-                <td><a href="http://localhost:3000/nodejs">http://localhost:3000/nodejs</a></td>
-            </tr>
-            <tr>
-                <td><a href="https://stackoverflow.com/users/11936196/seif-el-din-sweilam">https://stackoverflow.com/users/11936196/seif-el-din-sweilam</a></td>
-                <td><a href="http://localhost:3000/stackoverflow">http://localhost:3000/stackoverflow</a></td>
-            </tr>
-            <tr>
-                <td><a href="https://drive.google.com/drive/u/1/folders/1bpiBKNBd9n0Z79wrZvHVT1KyA9OBROLx">https://drive.google.com/drive/u/1/folders/1bpiBKNBd9n0Z79wrZvHVT1KyA9OBROLx</a></td>
-                <td><a href="http://localhost:3000/himym">http://localhost:3000/himym</a></td>
-            </tr>
+            <thead>
+                <tr>
+                    <th>Original URL</th>
+                    <th>Shortened URL</th>
+                    <th>Action</th>
+                </tr>
+            </thead>
+            <tbody>
+                <% urls.forEach(function(url) { %>
+                    <tr>
+                        <td><a href="<%= url.longUrl %>" target="_blank"><%= url.longUrl %></a></td>
+                        <td><a href="/<%= url.alias %>" target="_blank"><%= domain %><%= url.alias %></a></td>
+                        <td>
+                            <form id="deleteUrl" method="GET" action="/<%= url._id %>/delete">
+                                <button type="submit">Delete</button>
+                            </form>
+                        </td>
+                    </tr>
+                <% }) %>
+            </tbody>
         </table>
     </div>
 </body>
 
-</html>
+</html>
diff --git a/views/invalid.ejs b/views/invalid.ejs
@@ -0,0 +1,74 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Invalid Alias</title>
+    <style>
+        body {
+            font-family: Arial, sans-serif;
+            margin: 0;
+            padding: 20px;
+            background-color: #f8f8f8;
+            color: #333;
+        }
+
+        .container {
+            max-width: 600px;
+            margin: 50px auto;
+            padding: 20px;
+            background-color: #fff;
+            border-radius: 8px;
+            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
+            text-align: center;
+        }
+
+        h1 {
+            color: #e74c3c;
+        }
+
+        h2 {
+            color: #c0392b;
+        }
+
+        ul {
+            text-align: left;
+            margin: 20px 0;
+            padding: 0;
+            list-style-type: none;
+        }
+
+        ul li {
+            margin-bottom: 10px;
+        }
+
+        a {
+            display: inline-block;
+            margin-top: 20px;
+            padding: 10px 20px;
+            color: #fff;
+            background-color: #3498db;
+            text-decoration: none;
+            border-radius: 5px;
+        }
+
+        a:hover {
+            background-color: #2980b9;
+        }
+    </style>
+</head>
+
+<body>
+    <div class="container">
+        <h1>Invalid Alias</h1>
+        <h2>Your alias must match these conditions:</h2>
+        <ul>
+            <li>Does not contain special characters except '_'</li>
+            <li>Has a length of 4 characters or more</li>
+        </ul>
+        <a href="/">Return to Home Page</a>
+    </div>
+</body>
+
+</html>