Xpring-JS

Xpring-JS is the JavaScript client side library of the Xpring SDK.

Features

Xpring-JS provides the following features:

• Wallet generation and derivation (Seed or HD Wallet based)
• Address validation
• Account balance retrieval
• Sending XRP payments

Installation

Xpring-JS utilizes two components to access the Xpring Platform:

1. The Xpring-JS client side library (This library)
2. A server side component that handles requests from this library and proxies them to an XRP node

Client Side Library

Xpring-JS is available as an NPM package. Simply install with:

$ npm i xpring-js

Server Side Component

The server side component sends client-side requests to an XRP Node.

To get developers started right away, Xpring currently provides the server side component as a hosted service, which proxies requests from client side libraries to a a hosted XRP Node. Developers can reach the endpoint at:

grpc.xpring.tech:80

Xpring is working on building a zero-config way for XRP node users to deploy and use the adapter as an open-source component of rippled. Watch this space!

Usage

Note: Xpring SDK only works with the X-Address format. For more information about this format, see the Utilities section and http://xrpaddress.info.

Wallets

A wallet is a fundamental model object in XpringKit which provides key management, address derivation, and signing functionality. Wallets can be derived from either a seed or a mnemonic and derivation path. You can also choose to generate a new random HD wallet.

Wallet Derivation

Xpring-JS can derive a wallet from a seed or it can derive a hierarchical deterministic wallet (HDWallet) from a mnemonic and derivation path.

Hierarchical Deterministic Wallets

A hierarchical deterministic wallet is created using a mnemonic and a derivation path. Simply pass the mnemonic and derivation path to the wallet generation function. Note that you can omit the derivation path and have a default path be used instead.

const { Wallet } = require("xpring-js");

const mnemonic = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";

const hdWallet1 = Wallet.generateWalletFromMnemonic(mnemonic); // Has default derivation path
const hdWallet2 = Wallet.generateWalletFromMnemonic(mnemonic, Wallet.getDefaultDerivationPath()); // Same as hdWallet1

const hdWallet = Wallet.generateWalletFromMnemonic(mnemonic, "m/44'/144'/0'/0/1"); // Wallet with custom derivation path.

Seed Based Wallets

You can construct a seed based wallet by passing a base58check encoded seed string.

const { Wallet } = require("xpring-js");

const seedWallet = Wallet.generateWalletFromSeed("snRiAJGeKCkPVddbjB3zRwiYDBm1M");

Wallet Generation

Xpring-JS can generate a new and random HD Wallet. The result of a wallet generation call is a tuple which contains the following:

• A randomly generated mnemonic
• The derivation path used, which is the default path
• A reference to the new wallet

const { Wallet } = require("xpring-js");

// Generate a random wallet.
const generationResult = Wallet.generateRandomWallet();
const newWallet = generationResult.wallet

// Wallet can be recreated with the artifacts of the initial generation.
const copyOfNewWallet = Wallet.generateWalletFromMnemonic(generationResult.mnemonic, generationResult.derivationPath)

Wallet Properties

A generated wallet can provide its public key, private key, and address on the XRP ledger.

const { Wallet } = require("xpring-js");

const mnemonic = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";

const wallet = Wallet.generateWalletFromMnemonic(mnemonic);

console.log(wallet.getAddress()); // XVMFQQBMhdouRqhPMuawgBMN1AVFTofPAdRsXG5RkPtUPNQ
console.log(wallet.getPublicKey()); // 031D68BC1A142E6766B2BDFB006CCFE135EF2E0E2E94ABB5CF5C9AB6104776FBAE
console.log(wallet.getPrivateKey()); // 0090802A50AA84EFB6CDB225F17C27616EA94048C179142FECF03F4712A07EA7A4

Signing / Verifying

A wallet can also sign and verify arbitrary hex messages. Generally, users should use the functions on XpringClient to perform cryptographic functions rather than using these low level APIs.

const { Wallet } = require("xpringkit-js");

const mnemonic = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";
const message = "deadbeef";

const wallet = Wallet.generateWalletFromMnemonic(mnemonic);

const signature = wallet.sign(message);
wallet.verify(message, signature); // true

XpringClient

XpringClient is a gateway into the XRP Ledger. XpringClient is initialized with a single parameter, which is the URL of the remote adapter (see: ‘Server Side Component’ section above).

const { XpringClient } = require("xpring-js");

const remoteURL = "grpc.xpring.tech:80";
const xpringClient = XpringClient.xpringClientWithEndpoint(remoteURL);

Retrieving a Balance

A XpringClient can check the balance of an account on the ledger.

const { XpringClient } = require("xpring-js");

const remoteURL = "grpc.xpring.tech:80";
const xpringClient = XpringClient.xpringClientWithEndpoint(remoteURL);

const address = "X7u4MQVhU2YxS4P9fWzQjnNuDRUkP3GM6kiVjTjcQgUU3Jr";

const balance = await xpringClient.getBalance(address);
console.log(balance); // Logs a balance in drops of XRP

Sending XRP

A XpringClient can send XRP to other accounts on the ledger.

const { Wallet, XRPAmount, XpringClient } = require("xpring-js");

const remoteURL = "grpc.xpring.tech:80";
const xpringClient = XpringClient.xpringClientWithEndpoint(remoteURL);

// Amount of XRP to send
const amount = BigInt("10")

// Destination address.
const destinationAddress = "X7u4MQVhU2YxS4P9fWzQjnNuDRUkP3GM6kiVjTjcQgUU3Jr";

// Wallet which will send XRP
const senderWallet = Wallet.generateRandomWallet();

const transactionHash = await xpringClient.send(amount, destinationAddress, senderWallet);

Utilities

Address validation

The Utils object provides an easy way to validate addresses.

const { Utils } = require("xpring-js")

const rippleClassicAddress = "rnysDDrRXxz9z66DmCmfWpq4Z5s4TyUP3G"
const rippleXAddress = "X7jjQ4d6bz1qmjwxYUsw6gtxSyjYv5iWPqPEjGqqhn9Woti";
const bitcoinAddress = "1DiqLtKZZviDxccRpowkhVowsbLSNQWBE8";

Utils.isValidAddress(rippleClassicAddress); // returns true
Utils.isValidAddress(rippleXAddress); // returns true
Utils.isValidAddress(bitcoinAddress); // returns false

You can also validate if an address is an X-Address or a classic address.

const { Utils } = require("xpring-js")

const rippleClassicAddress = "rnysDDrRXxz9z66DmCmfWpq4Z5s4TyUP3G"
const rippleXAddress = "X7jjQ4d6bz1qmjwxYUsw6gtxSyjYv5iWPqPEjGqqhn9Woti";
const bitcoinAddress = "1DiqLtKZZviDxccRpowkhVowsbLSNQWBE8";

Utils.isValidXAddress(rippleClassicAddress); // returns false
Utils.isValidXAddress(rippleXAddress); // returns true
Utils.isValidXAddress(bitcoinAddress); // returns false

Utils.isValidClassicAddress(rippleClassicAddress); // returns true
Utils.isValidClassicAddress(rippleXAddress); // returns false
Utils.isValidClassicAddress(bitcoinAddress); // returns false

X-Address Encoding

You can encode and decode X-Addresses with the SDK.

const { Utils } = require("xpring-js")

const rippleClassicAddress = "rnysDDrRXxz9z66DmCmfWpq4Z5s4TyUP3G"
const tag = 12345;

// Encode an X-Address.
const xAddress = Utils.encodeXAddress(rippleClassicAddress, tag); // X7jjQ4d6bz1qmjwxYUsw6gtxSyjYv5xRB7JM3ht8XC4P45P

// Decode an X-Address.
const decodedClassicAddress = Utils.decodeXAddress(xAddress);

console.log(decodedClassicAddress.address); // rnysDDrRXxz9z66DmCmfWpq4Z5s4TyUP3G
console.log(decodedClassicAddress.tag); // 12345

Contributing

Pull requests are welcome! To get started with building this library and opening pull requests, please see contributing.md.

Thank you to all the users who have contributed to this library!

License

Xpring SDK is available under the MIT license. See the LICENSE file for more info.