@zilliqa-js/account

@zilliqa-js/account

Classes for managing accounts and account-related actions.

Interfaces

export interface TxReceipt {
  success: boolean;
  cumulative_gas: number;
}

interface TxParams {
  version: number;
  toAddr: string;
  amount: BN;
  gasPrice: BN;
  gasLimit: BN;

  code?: string;
  data?: string;
  receipt?: TxReceipt;
  nonce?: number;
  pubKey?: string;
  signature?: string;
}

Classes

Account

Class for managing an account (i.e., a private/public keypair).

Account(privateKey: string, nonce?: number): Account

Parameters

• privateKey: string - hex-encoded private key
• nonce: number (optional) - the current nonce

Returns

• Account - an Account instance.

Members

privateKey: string

publicKey: string

address: string

nonce: number

Static Methods

static fromFile(file: string, passphrase: string): Promise<Account>

Generates an account from any JSON-encoded string that complies with the Web3 Secret Storage definition.

Parameters

• file: string - JSON-encoded string containing the keystore file.
• passphrase: string - passphrase used to encrypt the file.

Returns

• Promise<Account> - an Account instance, initialised with the details provided by the keystore file.

Instance Methods

toFile(passphrase: string, kdf: 'pbkdf2' |'scrypt' = 'scrypt'): Promise<Account>

Encrypts and JSON-encodes the account. Complies with the Web3 Secret Storage definition.

Parameters

• passphrase: string - passphrase used to encrypt the file.
• kdf: 'pbkdf2' | 'scrypt' - the key derivation function to use for encryption.

Returns

• Promise<string> - the JSON-encoded string of the keystore file.

signTransaction(bytes: Buffer): string

Signs arbitrary bytes (most often transactions) using a Schnorr signing scheme.

Parameters

• bytes: Buffer - a Buffer of the protobuf encoded transaction bytes.

Returns

• string - hex-encoded signature over the bytes, using the instance private key.

Wallet

Class for managing multiple accounts.

Wallet(provider: Provider, accounts?: Account[] = []): Wallet

Parameters

• provider: Provider - a Provider instance (see @zilliqa-js/core). Required for signing.
• accounts: Account[] (optional) - an array of Account instances to pre-populate the wallet with.

Returns

• Wallet

Members

accounts: { [address: string]: Account }

An object consisting of address: Account KV pairs. By default, an empty object.

defaultAccount: Account

The default account used for signing transactions. By default, undefined. It is set to the 0-indexed account when a Wallet instance is constructed.

Instance methods

create(): void

Creates a new keypair with a randomly-generated private key. The new account is accessible by address. This method mutates the Wallet instance.

Parameters

None

Returns

• string - address of the new account.

addByPrivateKey(privateKey: string): string

Adds an Account to the Wallet.

Parameters

• privateKey: string - hex-encoded private key.

Returns

• string - the corresponing address, computer from the private key.

addByKeystore(keystore: string, passphrase: string): Promise<string>

Adds an account by keystore. This method is asynchronous and returns a Promise<string>, in order not to block on the underlying decryption operation.

Parameters

• keystore: string - JSON-encoded keystore file.
• passphrase: string - the passphrase used to encode the keystore file.

Returns

• Promise<string> - the corresponding address.

addByMnemonic(phrase: string, index: number = 0): string

Adds an Account by use of a mnemonic as specified in BIP-32 and BIP-39

Parameters

• phrase: string - the 12-word mnemonic to use.
• index: number (Optional) - the index of the child key.

Returns

• string - the corresponding address.

export(address: string, passphrase, string, kdf: 'pbkdf2' | 'scrypt'): Promise<string>

• Exports an Account to a keystore file, encrypted with a passphrase.

Parameters

• address: string - the address of the selected account.
• passphrase: string - the passphrase to encrypt the Account with.
• kdf: 'pbkdf2' | 'scrypt' - key derivation function.

Returns

• Promise<string> - the JSON-encoded keystore file.

remove(address: string): boolean

• Exports an Account to a keystore file, encrypted with a passphrase.

Parameters

• address: string - the address of the account to remove.

Returns

• boolean - whether the Account was successfully removed.

setDefault(address: string): void

Sets the default account to sign with.

Parameters

• address: string - the address of the account to set as default.

Returns

• void

sign(transaction: Transaction): Promise<Transaction>

Sign a Transaction with the default Account. This method is asynchronous as it will attempt to obtain the nonce from the Provider.

Parameters

• transaction: Transaction - a Transaction instance.

Returns

• Promise<Transaction> - a signed transaction.

signWith(transaction: Transaction, address: string): Promise<Transaction>

Sign a Transaction with the chosen Account. This method is asynchronous as it will attempt to obtain the nonce from the Provider.

Parameters

• transaction: Transaction - a Transaction instance.
• address: string - the address of the Account to be used for signing.

Returns

• Promise<Transaction> - a signed transaction.

Transaction

A class that represents a single Transaction on the Zilliqa network. It is a functor. Its purpose is to encode the possible states a Transaction can be in: Confirmed, Rejected, Pending, or Initialised (i.e., not broadcasted).

Members

bytes: Buffer

A getter protobuf that returns a Buffer of protobuf-encoded bytes. This is a convenience member that allows a Transaction to be signed easily.

senderAddress: string

A getter than computes the address of the Transaction sender. If there is no sender public key set, returns 0x00000000000000000000000000000000000000000000.

txParams: TxParams

A getter that returns the current TxParams.

Static Methods

static confirm(params: TxParams, provider: Provider): Transaction

Instantiates a Transaction in Confirmed state.

Parameters

• params: TxParams - core fields to initialise the Transaction with.
• provider: Provider - a Provider instance.

Returns

• Transaction - the newly-Instantiated Transaction.

Example

import { HTTPProvider } from '@zilliqa-js/core';
import { Transaction } from '@zilliqa-js/account';

const txParams = {
  version: 0,
  toAddr: '20_byte_hex_string',
  amount: new BN(8),
  gasPrice: new BN(8),
  gasLimit: new BN(888)
};
const tx = Transaction.confirm(txParams, new HTTPProvider('http://my-api.com'));

expect(tx.isConfirmed()).toBeTruthy();

static reject(params: TxParams, provider: Provider): Transaction

Instantiates a Transaction in Rejected state.

Parameters

• params: TxParams - core fields to initialise the Transaction with.
• provider: Provider - a Provider instance.

Returns

• Transaction - the newly-Instantiated Transaction.

Example

import { HTTPProvider } from '@zilliqa-js/core';
import { Transaction } from '@zilliqa-js/account';

const txParams = {
  version: 0,
  toAddr: '20_byte_hex_string',
  amount: new BN(8),
  gasPrice: new BN(8),
  gasLimit: new BN(888)
};
const tx = Transaction.reject(txParams, new HTTPProvider('http://my-api.com'));
expect(tx.isRejected()).toBeTruthy();

Instance Methods

confirm(txHash: string, maxAttemps: number = 5, interval: number = 1000): Promise<Transaction>

Checks whether the Transaction is confirmed on the blockchain, by verifying the its receipt status (boolean). This method uses an exponential backoff to poll the lookup node. By default, the number of attempts made is 5, with a starting interval of 1000ms.

Parameters

• txHash: string - the transaction hash to use for polling.
• maxAttemps: number = 5 (Optional) - the maximum number of attempts before setting status as Rejected.
• interval: number = 1000 (Optional) - the initial interval. This grows exponentially between attempts.

Returns

• Promise<Transaction> - Transaction with its status confirmed onchain.

Example

import { HTTPProvider } from '@zilliqa-js/core';
import { Transaction } from '@zilliqa-js/account';

// hash can be obtained from CreateTransaction
const my_hash = 'some_known_tx_hash';
conts tx = new Transaction(params, new HTTPProvider('http://my-api.com'));

tx.confirm(some_hash)
  .map((tx) => // do something)
  .catch((err) => // handle the error);

map(txHash): Transaction

Maps over the transaction, taking a callback that accepts TxParams. The user may freely mutate the Transaction, and will receive the newly-mutated transaction. The object returned is merged into the target Transaction.

Parameters

• fn: (prev: TxParams) => TxParams) - the transaction hash to use for polling. exponentially between attempts.

Returns

• Transaction.

Example

import { HTTPProvider } from '@zilliqa-js/core';
import { Transaction } from '@zilliqa-js/account';

// hash can be obtained from CreateTransaction
const my_hash = 'some_known_tx_hash';
let tx = new Transaction(params, new HTTPProvider('http://my-api.com'));

async () => {
  try {
    tx = await tx.confirm(some_hash);
    if (tx.isConfirmed()) {
      .map((tx) => {
        // do something, but must always return `TxParams`.
        // generally, you should avoid performing side effects in `map`.
        return tx
      });
    }
  } catch (err) {
    // handle this error somehow
  }
}();

Functions

encodeTransactionProto(tx: TxParams): Buffer

Encodes a transaction with protobuf and returns its bytes as a Buffer. Used for providing a payload to signTransaction.

Parameters

• tx: TxParams - plain object containing core transaction fields that must be used when generating a signature.

Returns

• Buffer - the bytes of the protobuf-serialised transaction fields.