nem2-qr-library

⚠️ This package is currently still in development, please do not use in production. The author of this package cannot be held responsible for any loss of money or any malintentioned usage forms of this package. Please use this package with caution.

NEM2 QR Library generator to generate QR codes for Catapult (NEM2) accounts and transactions.

This is a PoC to validate the proposed NIP 7 QR Library Standard Definition. When stable, the repository will be moved to the nemtech organization.

Installation

npm install nem2-qr-library

Usage

Generate QRCode for a Transaction Request

import { QRCodeGenerator } from 'nem2-qr-library';

// (Optional) create transfer transaction (or read from network)
const transfer = TransferTransaction.create(
  Deadline.create(),
  Address.createFromPublicKey(
    'C5C55181284607954E56CD46DE85F4F3EF4CC713CC2B95000FA741998558D268',
    NetworkType.MIJIN_TEST
  ),
  [new Mosaic(new NamespaceId('cat.currency'), UInt64.fromUint(10000000))],
  PlainMessage.create('Welcome to NEM!'),
  NetworkType.MIJIN_TEST
);

// create QR Code base64
const request = QRCodeGenerator.createTransactionRequest(transfer);

// get base64 notation for <img> HTML attribute
const base64 = request.toBase64();

Generate QRCode for a custom object

import { QRCodeGenerator } from 'nem2-qr-library';

// define custom object to suit your application use case.
const object = {"obj": "test"};

// create QR Code base64
const request = QRCodeGenerator.createExportObject(object, NetworkType.TEST_NET);

// get base64 notation for <img> HTML attribute
const base64 = request.toBase64();

Generate ContactQR code

import {
    PublicAccount,
    NetworkType,
} from 'nem2-sdk';

const name = 'test-contact-1';
const account = PublicAccount.createFromPublicKey(
                'C5C55181284607954E56CD46DE85F4F3EF4CC713CC2B95000FA741998558D268',
                NetworkType.TEST_NET
            );

// create QR Code base64
  const request = QRCodeGenerator.createAddContact(name, account);

// get base64 notation for <img> HTML attribute
const base64 = request.toBase64();

Generate QRCode for a Mnemonic data

import {
    Account,
    NetworkType,
    Password,
} from 'nem2-sdk';
import { MnemonicPassPhrase } from 'nem2-hd-wallets';

// create a mnemonic and password.
const mnemonic = MnemonicPassPhrase.createRandom();
const password = new Password('password');


// create QR Code base64
const exportMnemonic = new MnemonicQR(mnemonic, password, NetworkType.MIJIN_TEST, 'no-chain-id');

// get base64 notation for <img> HTML attribute
const base64 = exportMnemonic.toBase64();

The produced Base64 encoded payload can be used to display the QR Code. An example of display can be done easily with HTML, as follows:

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==" alt="Transfer Transaction QR code" />

Changelog

Important versions listed below. Refer to the Changelog for a full history of the project.

• 0.6.0 - 2019-05-27
• 0.3.0 - 2019-05-27

License

Licensed under the Apache License, Version 2.