monero-nodejs-libwallet

monero-nodejs-libwallet

Wrapper for monero libwallet. All created wallet files are compatible with monero-wallet-cli and monero-wallet-rpc. Check example/index.js for usage examples of the library.

Installation

To start using the library is pretty straightword. Add the dependency into your package.json:

{
  "name": "mywallet",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "monero-nodejs-libwallet": "*"
  }
}

Install it:

$ npm install

npm will try to find and download precompiled binaries for your node version, OS and architecture. Then include require statement in your js-code and use it:

const monero = require('monero-nodejs-libwallet');

If npm couldn't find proper binaries for your platform please refer to manual build section.

Manual Build

If you want to build the addon manually or there are no prebuilt binaries for your platform in npm repository please check the official monero guide on how to satisfy all the dependencies. After that you may compile the addon following these steps:

Checkout the repository:

$ git clone https://github.com/exantech/monero-nodejs-libwallet

Run build:

$ node-pre-gyp configure build

After successfull build set up your project's package.json:

{
  "name": "example",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "monero-nodejs-libwallet": "file:<path-to-libwallet>"
  }
}

Install it locally:

$ npm install

And use it in you source code:

const monero = require('monero-nodejs-libwallet');

API

Module Functions

setupLog

Configures log level and output (file or stdout). Accepts integer log level (from 0 to 4) and optional output filename (skip it if you want log to write to stdout):

const monero = require('monero-nodejs-libwallet');
monero.setupLog(4, 'wallet.log'); //maximum logs into `wallet.log` file

createWallet

Create new wallet asynchronously:

const monero = require('monero-nodejs-libwallet');
monero.createWallet({
	'path': 'test-wallet',
	'password': '123', 
	'network': 'mainnet',
	'daemonAddress': 'localhost:18081',
}).then((wallet) => console.log('New wallet succesfully created: ' + wallet.address()))
   .catch((e) => console.log('Failed to create new wallet: ' + e));

Arguments object:

property	description	required
path	path to wallet file	yes
password	password	yes
network	one of mainnet (default) / stagenet / testnet	no
daemonAddress	remote node address	yes
language	language to generate mnemonics for ('English' is default)	no

Returns promise object. Throws in case of arguments error.

openWallet

Opens existing wallet asynchronously:

const monero = require('monero-nodejs-libwallet');
monero.openWallet({
	'path': 'test-wallet',
	'password': '123', 
	'network': 'mainnet',
	'daemonAddress': 'localhost:18081',
}).then((wallet) => console.log('New wallet succesfully created: ' + wallet.address()))
   .catch((e) => console.log('Failed to create new wallet: ' + e));

Arguments object:

property	description	required
path	path to wallet file	yes
password	password	yes
network	one of mainnet (default) / stagenet / testnet	no
daemonAddress	remote node address	yes
language	language to generate mnemonics for ('English' is default)	yes

Returns promise object. Throws in case of arguments error.

walletExists

Checks if wallet exists:

const monero = require('monero-nodejs-libwallet');
if (monero.walletExists('test-wallet')) {
    console.log('Wallet already exists');
} else {
    console.log('Wallet does not exist');
}

Returns boolean.

genPaymentId

Generates new payment id:

const monero = require('monero-nodejs-libwallet');
console.log('New payment id: ' + monero.genPaymentId());

paymentIdValid

Checks if given payment id is valid:

const monero = require('monero-nodejs-libwallet');
if (monero.paymentIdValid('180b67533011df75b74333e62599c160f5484bf8bb98779598520dfb90633198')) {
    console.log('Payment id is valid');
} else {
    console.log('Payment id is not valid');
}

addressValid

Checks if given monero address valid in certain network type:

const monero = require('monero-nodejs-libwallet');
if (monero.addressValid('44zrUGhyRHYbHYrfiGAtLdJMHfe5DtoFTBeVPCE6MGKzZA2bJ4tCJFuhYk3Wjp3YxEWoQU8So5xUiiArgnkBHZgX8Fyhv6e', 'mainnet')) {
    console.log('Address is valid');
} else {
    console.log('Address is not valid');
}

Wallet Functions

address

Returns an address of the wallet:

console.log('Wallet address: ' + wallet.address());

seed

Returns mnemonic seed for the wallet:

console.log('Wallet seed: ' + wallet.seed());

on

Subscibes on wallet emitted events:

wallet.on('newBlock', function (height) {
	console.log("blockchain updated, height: " + height);
}).on('refreshed', function () {
	console.log("wallet is synchronized");
}).on('updated', function () {
	console.log("updated");
}).on('unconfirmedMoneyReceived', function(tx, amount) {
	console.log("unconfirmed money received. tx: " + tx + ", amount: " + amount);
}).on('moneyReceived', function(tx, amount) {
	console.log("money received. tx: " + tx + ", amount: " + amount);
}).on('moneySpent', function(tx, amount) {
	console.log("money spent. tx: " + tx + ", amount: " + amount);
});

off

Unsubscribes from either one or all of events:

wallet.off('newBlock'); //unsubscribes from 'newBlock' events
wallet.off(); // unsubscribes from all events

store

Asynchronously saves wallet into the file:

wallet.store()
	.then(() => {console.log("wallet stored")})
	.catch((e) => {console.log("unable to store wallet: " + e)});

createTransaction

Creates pending transaction:

wallet.createTransaction({
	'address': '44zrUGhyRHYbHYrfiGAtLdJMHfe5DtoFTBeVPCE6MGKzZA2bJ4tCJFuhYk3Wjp3YxEWoQU8So5xUiiArgnkBHZgX8Fyhv6e',
	'amount': '2000000000', //monero atomic units as string
}).then((tx) => {
	console.log("transaction created: " + tx.transactionsIds());
}).catch((e) => {
	sent = false;
	console.log("couldn't create transaction: " + e);
});

Accepts arguments object:

property	description	required
address	valid monero address	yes
amount	monero atomic units as string	yes
paymentId	valid payment id	no
mixin	ring signature size (current minimum is 7)	no

Throws in case of arguments error. Returns promise. then-callback accepts PendingTransaction object, catch-callback accepts error string.

path

Returns current wallet file path:

console.log("wallet located at : " + wallet.path());

network

Returns current network type (either mainnet, stagenet or testnet):

console.log("network : " + wallet.network());

secretViewKey, publicViewKey, secretSpendKey, publicSpendKey, publicMultisigSignerKey

Returns corresponding hex-encoded wallet key:

console.log("secret view key : " + wallet.secretViewKey());
console.log("public view key : " + wallet.publicViewKey());
console.log("secret spend key : " + wallet.secretSpendKey());
console.log("public spend key : " + wallet.publicSpendKey());
console.log("public spend key : " + wallet.publicMultisigSignerKey());

setPassword

Sets new password to the wallet:

wallet.setPassword('iamsherlocked');

Returns wallet object.

setRefreshFromBlockHeight

Sets the blockchain height to start refresh from:

wallet.setRefreshFromBlockHeight(1555371);

Returns wallet object.

getRefreshFromBlockHeight

console.log('refreshing from: ' + wallet.getRefreshFromBlockHeight());

connected

Checks if wallet is connected to the daemon:

console.log('connected: ' + wallet.connected());

setTrustedDaemon, trustedDaemon

Sets trusted flag to the daemon:

if (wallet.trustedDamon()) {
    wallet.setTrustedDaemon(false); // trust no one
}

setTrustedDaemon returns wallet object.

balance, unlockedBalance

Returns wallet balance:

console.log('wallet: ' + wallet.address());
console.log('balance: ' + wallet.balance());
console.log('unlocked balance: ' + wallet.unlockedBalance());

blockchainHeight

Returns local blockchain height:

console.log('synced till: ' + wallet.blockchainHeight());

daemonBlockchainHeight

Returns remote node's blockhain height:

console.log('synchronized till: ' + wallet.daemonBlockchainHeight());

synchronized

Checks if wallet is synchronized with a network:

console.log('wallet synchronized: ' + wallet.synchronized());

pauseRefresh

Stops synchronization.

startRefresh

Resumes synchronization.

multisigState

Returns an object representing multisig wallet state:

var state = wallet.multisigState();
console.log('is multisig: ' + state.isMultisig);
console.log('is multisig ready: ' + state.isReady); //indicates multisig wallet creation process is finished
console.log('multisig threshold: ' + state.threshold); //number of required signatures
console.log('multisig total: ' + state.total); //number of participants

signMessage, verifySignedMessage

These functions only allowed for non-multisig wallets. signMessage returns signature for arbitrary message. verifySignedMessage Verifies message's signature with public monero address. Returns true if the signature is valid:

var signature = wallet1.signMessage('Hello, world!');
console.log('signature valid: ' + wallet2.verifySignedMessage('Hello, world!', wallet1.address(), signature));

signMultisigParticipant, verifyMessageWithPublicKey

These functions only allowed for multisig wallets. signMultisigParticipant signs a message with your multisig public signer's key (Note: it's not equal to spend public key!) and returns the signature. verifyMessageWithPublicKey verifies message's signature with multisig public signer's key. Accepts message, multisig public signer's and the signature:

var signature = wallet1.signMultisigParticipant('Hello, world!');
var signerKey = wallet1.publicMultisigSignerKey();
console.log('signature valid: ' + wallet2.verifyMessageWithPublicKey('Hello, world!', signerKey, signature));

getMultisigInfo

Returns serialized to string multisig info data necessary for multisig wallet creation (see example below).

makeMultisig

Accepts multisig infos from all participants and the threshold to set wallet into multisig state (see example below). In case of N / N wallets it's the last step in wallet creation. In case of N - 1 / N wallets returns extra multisig info which must be passed to another participants.

finalizeMultisig

Accepts extra multisig info (result of makeMultisig invocation) from all participants and finalizes N - 1 / N multisig wallet creation.

3 / 3 multisig wallet creation example:

var msigInfo1 = wallet1.getMultisigInfo();
var msigInfo2 = wallet2.getMultisigInfo();
var msigInfo3 = wallet3.getMultisigInfo();

wallet1.makeMultisig([msigInfo2, msigInfo3], 3);
wallet2.makeMultisig([msigInfo1, msigInfo3], 3);
wallet3.makeMultisig([msigInfo1, msigInfo2], 3);

console.log('multisig wallet created');
console.log('wallet1 address: ' + wallet1.address());
console.log('wallet2 address: ' + wallet2.address());
console.log('wallet3 address: ' + wallet3.address());

2 / 3 multisig wallet creation example:

var msigInfo1 = wallet1.getMultisigInfo();
var msigInfo2 = wallet2.getMultisigInfo();
var msigInfo3 = wallet3.getMultisigInfo();

var emsigInfo1 = wallet1.makeMultisig([msigInfo2, msigInfo3], 2);
var emsigInfo2 = wallet2.makeMultisig([msigInfo1, msigInfo3], 2);
var emsigInfo3 = wallet3.makeMultisig([msigInfo1, msigInfo2], 2);

wallet1.finalizeMultisig([emsigInfo2, emsigInfo3]);
wallet2.finalizeMultisig([emsigInfo1, emsigInfo3]);
wallet3.finalizeMultisig([emsigInfo1, emsigInfo2]);

console.log('multisig wallet created');
console.log('wallet1 address: ' + wallet1.address());
console.log('wallet2 address: ' + wallet2.address());
console.log('wallet3 address: ' + wallet3.address());

exportMultisigImages

Returns string of exported partial key images (see example below).

importMultisigImages

Imports exported partial key images from other participants:

var ki1 = msigWallet1.exportMultisigImages();
var ki2 = msigWallet2.exportMultisigImages();
var ki3 = msigWallet3.exportMultisigImages();

msigWallet1.importMultisigImages([ki2, ki3]);
msigWallet2.importMultisigImages([ki1, ki3]);
msigWallet3.importMultisigImages([ki1, ki2]);

restoreMultisigTransaction

Deserializes multisig transaction from other participant. Returns promise object.

Pending Transaction's Functions

commit

Asynchronously sends transaction into the network:

tx.commit().then(() => {
	console.log("transaction commited successfully");
}).catch((e) => {
	console.log("error on commiting transaction: " + e);
});

amount

Returns amount of the transaction:

console.log("transaction amount: " + tx.amount());

fee

Returns transaction fee:

console.log("transaction fee: " + tx.fee());

transactionsCount

If generated transaction is too big libwallet splits it into several transactions. This method returns number of generated low-level transactions:

console.log("generated " + tx.transactionsCount() + ' low level transactions');

transactionsIds

Returns transactions ids of newly generated pending transaction:

if (tx.transactionsCount() > 1) {
    for (i = 0; i < tx.transactionsCount(); i++) {
        console.log('transaction #' + i + ': ' + tx.transactionsIds()[i]);
    }
} else {
    console.log('transaction id' + tx.transactionsIds());
}

multisigSignData

Returns serialized multisig transaction which has to be passed to another participants for signature (see example below).

signMultisigTransaction

Signs multisig transaction:

wallet1.createTransaction({
	'address': '44zrUGhyRHYbHYrfiGAtLdJMHfe5DtoFTBeVPCE6MGKzZA2bJ4tCJFuhYk3Wjp3YxEWoQU8So5xUiiArgnkBHZgX8Fyhv6e',
	'amount': '2000000000',
}).then((tx) => {
	var signData = tx.multisigSignData();

	wallet2.restoreMultisigTransaction(signData).then((tx) => {
		console.log('multisig transaction restored successfully. Signing...');
		tx.signMultisigTransaction();
	}).catch((e) => {
		console.log("couldn't restore multisig transaction: " + e);
	});
}).catch((e) => {
	console.log("couldn't create transaction: " + e);
});

signersKeys

Returns an array of public signers key of participants who already signed this transaction:

console.log('participants already signed this transaction: ' + tx.signersKeys());