random shit idk

Prerequisites:

• Node.js and npm installed on your system
• MongoDB server running locally or remotely

Steps:

1. Clone the repository or create a new project directory:

   mkdir contact-api
   cd contact-api
   

2. Initialize a new Node.js project and install the required dependencies:

   npm init -y
   npm install express mongoose body-parser morgan helmet
   

3. Create a new file, e.g., app.js, and copy the provided code into it:

   const express = require('express');
   const mongoose = require('mongoose');
   const bodyParser = require('body-parser');
   const morgan = require('morgan');
   const helmet = require('helmet');
   
   const app = express();
   
   // Connect to MongoDB
   mongoose.connect('mongodb://localhost/contacts', {
     useNewUrlParser: true,
     useUnifiedTopology: true,
   });
   
   // Define Contact model
   const Contact = mongoose.model('Contact', {
     name: String,
     email: String,
     phone: String,
   });
   
   // Middleware
   app.use(bodyParser.json());
   app.use(morgan('dev'));
   app.use(helmet());
   
   // IP Blocker Middleware
   const blockedIPs = ['192.168.1.1', '10.0.0.1', '172.16.0.1'];
   
   const blockIPMiddleware = (req, res, next) => {
     const clientIP = req.connection.remoteAddress || req.socket.remoteAddress;
     if (blockedIPs.includes(clientIP)) {
       return res.status(403).json({ error: 'Forbidden' });
     }
     next();
   };
   
   app.use(blockIPMiddleware);
   
   // Access Control Middleware
   const whitelist = ['[email protected]', '[email protected]', '[email protected]'];
   const blacklist = ['[email protected]', '[email protected]', '[email protected]'];
   
   const checkAccessControl = (req, res, next) => {
     const { email } = req.body;
   
     if (blacklist.includes(email)) {
       return res.status(403).json({ error: 'Forbidden' });
     }
   
     if (whitelist.length > 0 && !whitelist.includes(email)) {
       return res.status(403).json({ error: 'Forbidden' });
     }
   
     next();
   };
   
   app.use(checkAccessControl);
   
   // API Endpoints
   app.get('/api/contacts', async (req, res) => {
     const contacts = await Contact.find();
     res.json(contacts);
   });
   
   app.get('/api/contacts/:id', async (req, res) => {
     const contact = await Contact.findById(req.params.id);
     if (!contact) {
       return res.status(404).json({ error: 'Contact not found' });
     }
     res.json(contact);
   });
   
   app.post('/api/contacts', async (req, res) => {
     const { name, email, phone } = req.body;
     const contact = new Contact({ name, email, phone });
     await contact.save();
     res.status(201).json(contact);
   });
   
   app.put('/api/contacts/:id', async (req, res) => {
     const { name, email, phone } = req.body;
     const contact = await Contact.findByIdAndUpdate(
       req.params.id,
       { name, email, phone },
       { new: true }
     );
     if (!contact) {
       return res.status(404).json({ error: 'Contact not found' });
     }
     res.json(contact);
   });
   
   app.delete('/api/contacts/:id', async (req, res) => {
     const contact = await Contact.findByIdAndDelete(req.params.id);
     if (!contact) {
       return res.status(404).json({ error: 'Contact not found' });
     }
     res.json({ message: 'Contact deleted' });
   });
   
   // Start the server
   app.listen(3000, () => {
     console.log('Server is running on port 3000');
   });

4. Run the server:

   node app.js
   

5. Test the API endpoints:

   • Get all contacts: GET http://localhost:3000/api/contacts
   • Get a single contact: GET http://localhost:3000/api/contacts/CONTACT_ID
   • Create a new contact: POST http://localhost:3000/api/contacts
     • Body: { "name": "John Doe", "email": "[email protected]", "phone": "1234567890" }
   • Update a contact: PUT http://localhost:3000/api/contacts/CONTACT_ID
     • Body: { "name": "Jane Doe", "email": "[email protected]", "phone": "0987654321" }
   • Delete a contact: DELETE http://localhost:3000/api/contacts/CONTACT_ID

Explanation of the functions:

1. Connect to MongoDB: The code uses Mongoose to connect to a MongoDB database named contacts.

2. Define Contact model: The Contact model is defined using Mongoose, representing the structure of the contact data.

3. Middleware setup: The code sets up several middleware functions:

   • bodyParser.json(): Parses incoming JSON data in the request body.
   • morgan('dev'): Logs incoming requests to the console.
   • helmet(): Helps secure the Express app by setting various HTTP headers.
   • blockIPMiddleware: Checks the client's IP address against a list of blocked IPs and returns a 403 Forbidden response if the IP is found in the list.
   • checkAccessControl: Checks the email field in the request body against the whitelist and blacklist arrays, and returns a 403 Forbidden response if the email is found in the blacklist or is not in the whitelist (if the whitelist is not empty).

4. API Endpoints:

   • GET /api/contacts: Retrieves all contacts.
   • GET /api/contacts/:id: Retrieves a single contact by its ID.
   • POST /api/contacts: Creates a new contact.
   • PUT /api/contacts/:id: Updates an existing contact by its ID.
   • DELETE /api/contacts/:id: Deletes a contact by its ID.

The code uses Mongoose's asynchronous functions, such as find(), findById(), save(), findByIdAndUpdate(), and findByIdAndDelete(), to interact with the MongoDB database.

The IP blocker and access control mechanisms are applied to all the API endpoints through the middleware functions. If a request is blocked, the middleware functions will return a 403 Forbidden response.

Remember to customize the blockedIPs, whitelist, and blacklist arrays according to your specific requirements.