README

js-bigchaindb-driver">

Official JavaScript driver for BigchainDB to create transactions in Node.js and the browser.

Compatibility

BigchainDB Server	BigchainDB JavaScript Driver
`0.10`	`0.1.x`
`1.0.0`	`0.3.x`
`1.3.x`	`3.x.x`
`>= 2.0.0`	`4.x.x`

Breaking changes

Version 4.0 of BigchainDB JavaScript Driver makes the driver compatible with BigchainDB 2.0. There are new functions for sending off transactions along with other changes. Check older versions
Version 3.2 of BigchainDB JavaScript Driver introduces a new way of creating transfer transactions. Check older versions

Installation and Usage
- Example: Create a transaction
- Browser usage
BigchainDB Documentation
Speed Optimizations
Development
Release Process
Authors
Licenses

Installation and Usage

npm install bigchaindb-driver

const driver = require('bigchaindb-driver')
// or ES6+
import driver from 'bigchaindb-driver'

Example: Create a transaction

const driver = require('bigchaindb-driver')
const base58 = require('bs58');
const crypto = require('crypto');
const { Ed25519Sha256 } = require('crypto-conditions');

// BigchainDB server instance (e.g. https://example.com/api/v1/)
const API_PATH = 'http://localhost:9984/api/v1/'

// Create a new keypair.
const alice = new driver.Ed25519Keypair()

// Construct a transaction payload
const tx = driver.Transaction.makeCreateTransaction(
    // Define the asset to store, in this example it is the current temperature
    // (in Celsius) for the city of Berlin.
    { city: 'Berlin, DE', temperature: 22, datetime: new Date().toString() },

    // Metadata contains information about the transaction itself
    // (can be `null` if not needed)
    { what: 'My first BigchainDB transaction' },

    // A transaction needs an output
    [ driver.Transaction.makeOutput(
            driver.Transaction.makeEd25519Condition(alice.publicKey))
    ],
    alice.publicKey
)

// Sign the transaction with private keys
const txSigned = driver.Transaction.signTransaction(tx, alice.privateKey)

// Or use delegateSignTransaction to provide your own signature function
function signTransaction() {
    // get privateKey from somewhere
    const privateKeyBuffer = Buffer.from(base58.decode(alice.privateKey))
    return function sign(serializedTransaction, input, index) {
        const transactionUniqueFulfillment = input.fulfills ? serializedTransaction
                .concat(input.fulfills.transaction_id)
                .concat(input.fulfills.output_index) : serializedTransaction
        const transactionHash = crypto.createHash('sha3-256').update(transactionUniqueFulfillment).digest()
        const ed25519Fulfillment = new Ed25519Sha256();
        ed25519Fulfillment.sign(transactionHash, privateKeyBuffer);
        return ed25519Fulfillment.serializeUri();
    };
}
const txSigned = driver.Transaction.delegateSignTransaction(tx, signTransaction())

// Send the transaction off to BigchainDB
const conn = new driver.Connection(API_PATH)

conn.postTransactionCommit(txSigned)
    .then(retrievedTx => console.log('Transaction', retrievedTx.id, 'successfully posted.'))

Browser usage

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>BigchainDB boilerplate</title>
        <!-- Adjust version to your needs -->
        <script src="https://unpkg.com/bigchaindb-driver@4.2.0/dist/browser/bigchaindb-driver.window.min.js"></script>

        <script>
            // BigchainDB server instance (e.g. https://example.com/api/v1/)
            const API_PATH = 'http://localhost:9984/api/v1/'

            // Create a new keypair.
            const alice = new BigchainDB.Ed25519Keypair()

            // Construct a transaction payload
            const tx = BigchainDB.Transaction.makeCreateTransaction(
                // Define the asset to store, in this example it is the current temperature
                // (in Celsius) for the city of Berlin.
                { city: 'Berlin, DE', temperature: 22, datetime: new Date().toString() },

                // Metadata contains information about the transaction itself
                // (can be `null` if not needed)
                { what: 'My first BigchainDB transaction' },

                // A transaction needs an output
                [ BigchainDB.Transaction.makeOutput(
                        BigchainDB.Transaction.makeEd25519Condition(alice.publicKey))
                ],
                alice.publicKey
            )

            // Sign the transaction with private keys
            const txSigned = BigchainDB.Transaction.signTransaction(tx, alice.privateKey)

            // Send the transaction off to BigchainDB
            let conn = new BigchainDB.Connection(API_PATH)

            conn.postTransactionCommit(txSigned)
                .then(res => {
                    const elem = document.getElementById('lastTransaction')
                    elem.href = API_PATH + 'transactions/' + txSigned.id
                    elem.innerText = txSigned.id
                    console.log('Transaction', txSigned.id, 'accepted')
                })
            // Check console for the transaction's status
        </script>
    </head>
    <body id="home">
        <h1>Hello BigchainDB</h1>
        <p>Your transaction id is: <a id="lastTransaction" target="_blank"><em>processing</em></a></p>
    </body>
</html>

BigchainDB Documentation

Speed Optimizations

This implementation plays "safe" by using JS-native (or downgradable) libraries for its crypto-related functions to keep compatibilities with the browser. If you do want some more speed, feel free to explore the following:

chloride, or its underlying sodium library
node-sha3 -- MAKE SURE to use steakknife's fork if the FIPS 202 upgrade hasn't been merged (otherwise, you'll run into all kinds of hashing problems)

Development

git clone git@github.com:bigchaindb/js-bigchaindb-driver.git
cd js-bigchaindb-driver/

npm i
npm run dev

After updating source files in src/, make sure to update the API documentation. The following command will scan all source files and create the Markdown output into ./API.md:

npm run doc

Release Process

See the file named RELEASE_PROCESS.md.

Authors

inspired by js-bigchaindb-quickstart of @sohkhai [thanks]
BigchainDB contact@ipdb.global
BigchainDB contributors

Licenses

See LICENSE and LICENSE-docs.

bigchaindb-driver

Usage no npm install needed!