📦 Hyperledger Fabric – README.md

# Blockchain Voting System – Hyperledger Fabric (Chaincode + REST API)

This project is part of a hybrid blockchain-based voting system. It uses Hyperledger Fabric to securely and transparently store voting data per TPS (Tempat Pemungutan Suara).

## 📁 Structure

- `chaincode/` – Chaincode written in JavaScript for TPS asset management.
- `server.js` – Express.js REST API to interact with the blockchain network.

## 🧩 Features

- Register new TPS with voter capacity.
- Register voters to a TPS.
- Cast a vote (updates user's HasVoted, total votes, and results).
- Update vote results for Paslon A and B.
- Read and query TPS assets from the ledger.

## 🛠️ Setup

### Prerequisites

- Node.js (v16 or later)
- Docker & Docker Compose
- Hyperledger Fabric test network
- Fabric Gateway SDK (`@hyperledger/fabric-gateway`)
- `jq` (for UNIX-based systems)

### 1. Start the Fabric Network

```bash
cd fabric-samples/test-network
./network.sh up createChannel -ca
./network.sh deployCC -ccn basic -ccp ../asset-transfer-basic/chaincode-javascript -ccl javascript

2. Start REST API Server

cd asset-transfer-basic/application-express
npm install
node server.js

Server runs on: http://localhost:3000

📡 API Endpoints

Method	Endpoint	Description
GET	/api/assets	List all TPS assets
GET	/api/assets/:id	Read a specific TPS asset
POST	/api/assets	Create new TPS
POST	/api/register	Register user to a TPS
POST	/api/vote	Cast vote from a user
POST	/api/vote-results	Submit final vote results to TPS
POST	/api/init	(Optional) Initialize default TPS

✍️ Chaincode Methods

• CreateAsset
• ReadAsset
• RegisterUsers
• CastVote
• UpdateVoteResults
• GetAllAssets

🔒 Notes

• Each TPS asset stores:

  • TotalVoters, TotalVoted
  • Voters list with HasVoted flag
  • Vote results per Paslon

• InitLedger is optional; data should be synced by Laravel seeder/API.