Raihan Nismara raihan71

P2P Ridehailing App — Claude Code Instructions

You are building a fully decentralized peer-to-peer ridehailing mobile app. Zero centralized servers. The entire system runs on user devices and the Solana blockchain.

Core Flow

A rider opens the app, sets a destination, and the app calculates a fare client-side using Haversine distance.
The rider posts a ride request on-chain containing a blinded zone ID (ZK proof of zone membership), the offered fare, and escrowed SOL.
Nearby drivers discover the request via libp2p GossipSub and on-chain queries.
Drivers submit offers on-chain — they can accept the rider's fare or counter-offer (capped at 2x the rider's price).

Instructions for Backing Up Nginx Configuration and Certificates

Follow these steps to back up your Nginx configuration and certificates from an Ubuntu machine.

Step 1: Create a Backup Directory

Create a Temporary Directory:
- Create a directory to store all configurations and certificates temporarily:

Step-by-step instructions for installing XAMPP, configuring paths, and installing Composer on macOS:

Install XAMPP:

Go to XAMPP download page and download the DMG file.
Open the downloaded DMG file.
Press F4 and search for "Privacy and Security."
In the "Security" section, you'll find the blocked app. Click "Open Anyway" to continue with the installation.
Start the XAMPP services.

Add Cloudflare custom domain to Vercel

Sign up and sign in to Cloudflare https://dash.cloudflare.com/sign-up.
In your Cloudflare dashboard, select the Domain Registration > Register Domains tab.
Search for your favorite domain and purchase it. In my case, I purchased the domain https://nivethan.me/ for my portfolio.
Sign in to Vercel and go to your dashboard, where you can see all your projects in the Overview tab.
Click on a project and on the top right, select Domains.
Type your domain in the text box, e.g., nivethan.me, and click Add.
Select the recommended option: Add www.nivethan.me and redirect nivethan.me to it.
Vercel will show an invalid configuration under your domains and display the relevant A record IP under nivethan.me and a CNAME IP under www.nivethan.me. These need to be set up on Cloudflare to make it work.

Android Development

Tools	Name	Version
Platform	Android	OS 4.4 KitKat Level 19 or higher
Programming Language	Kotlin	JDK 8.x
Architecture	Model View ViewModel
Rest Response	JSON
Local Database	SQLite
View Injection	ViewBinding

Hi Pal, junior flash developer here:

secure copy | https://www.youtube.com/watch?v=fmMg6cyww14&t=201s

  $: scp -r dump/ domgarcia@127.0.1.4444:/tmp

mongorestore with port | https://docs.mongodb.com/manual/reference/program/mongorestore/

  $: mongorestore --db domsdb /tmp/dump --uri="see-docs"

Modern javascript from the beginning

Useful Syntax

console.table(data) = visualized data with ta
typeof data = get to know type data of the variable
Number(string) = convert number any type to type of number
String(number) = convert number any type to type of string
toFixed(decimal) = to add custom decimal number
parseInt(string or number) = just parse to the integer
parseFloat(string or number) = parse to the float type

Node.js Deployment

Steps to deploy a Node.js app to DigitalOcean using PM2, NGINX as a reverse proxy and an SSL from LetsEncrypt

1. Sign up for Digital Ocean

If you use the referal link below, you get $10 free (1 or 2 months) https://m.do.co/c/5424d440c63a

2. Create a droplet and log in via ssh

I will be using the root user, but would suggest creating a new user

	import React, { Component } from 'react';
	// import ReactDOM from 'react-dom';
	import PropTypes from 'prop-types';
	import Linkify from 'react-linkify';
	import {
	renderToString,
	} from 'react-dom/server';
	import Parser from 'html-react-parser';

	const style =

	import classNameProp from 'class-name-prop';
	import { useRouter } from 'next/router';
	import React from 'react';
	import styles from './RouteIndicator.module.css';

	const DONE_DURATION = 250;

	export default function RouteIndicator() {
	const router = useRouter();