Matt Lockyer mattlockyer

💭

🥳

PRs with comments > Issues; Active on Twitter; Bad response time to TG or LinkedIn DMs.

mattlockyer / App.js

Last active September 27, 2020 23:53

React useContext, state, dispatch with thunk for namespaced state management

	import React, { useContext, useEffect } from 'react';
	import { store } from './state/store';
	import { onMount } from './state/test';

	const ExampleComponent = () => {
	const { state, dispatch, update: updateStore } = useContext(store)
	console.log(state)
	const update = async () => {
	// dispatch thunk wraps function with state, dispatch
	const res = await dispatch(initNear())

mattlockyer / check-hash.js

Created September 21, 2020 00:31

Check a NEAR contract hash using near-api-js

	import * as nearlib from 'near-api-js'
	const contractBytes = await fetch('./contract.wasm').then((r) => r.arrayBuffer())
	const hash = await crypto.subtle.digest('SHA-256', contractBytes)
	const hash58 = nearlib.utils.serialize.base_encode(hash)
	console.log(hash58)

mattlockyer / sane-localStorage.js

Last active January 14, 2021 03:46

Sane localStorage wrappers for JSON

	export const get = (k, d = {}) => {
	let v = localStorage.getItem(k)
	try {
	return JSON.parse(v \|\| JSON.stringify(d))
	} catch (e) {
	return v
	}
	}
	export const set = (k, v) => localStorage.setItem(k, typeof v === 'string' ? v : JSON.stringify(v))
	export const del = (k) => localStorage.removeItem(k)

mattlockyer / console.js

Created October 23, 2020 22:23

Quick Modal for Developer Console

	modal = document.createElement('div')
	modal.innerHTML = '<span id="close-modal">x</span>'
	style = modal.style
	modal.style.zIndex = 1000
	modal.style.width = modal.style.height = '90%'
	modal.style.background = 'white'
	modal.style.position = 'absolute'
	modal.style.top = modal.style.left = '5%'
	modal.style.padding = '16px'
	document.body.appendChild(modal)

mattlockyer / random.rs

Last active June 2, 2022 17:40

NEAR Random Number (u128)


	// anywhere in your contract

	fn random_u128() -> u128 {
	let random_seed = env::random_seed(); // len 32
	// using first 16 bytes (doesn't affect randomness)
	as_u128(random_seed.get(..16).unwrap())
	}

	fn as_u128(arr: &[u8]) -> u128 {

mattlockyer / index.html

Created December 19, 2020 23:18

Image Link Preview Meta Tags

	Use square image or 1200x628

	<head>
	<meta property="og:title" content="">
	<meta property="og:image" content="">
	<meta property="og:type" content="website">
	<meta name="twitter:card" content="summary_large_image">
	<meta name="twitter:site" content="@mattdlockyer">
	<meta name="twitter:creator" content="@mattdlockyer">
	<meta property="twitter:image:alt" content="">

mattlockyer / sign-with-near-cli.js

Last active January 21, 2021 05:41

Signing Messages with near-cli

	// set the network (if you want mainnet)
	export NEAR_ENV=mainnet
	// choose 1 or 2
	// 1. NEAR wallet login
	near login
	// 2. LEDGER replace ACCOUNT_ID
	// change useLedgerKey value if you are using custom ledger path
	near repl --accountId="ACCOUNT_ID" --useLedgerKey="44'/397'/0'/0'/1'"

	// REPL

mattlockyer / sign-for-user.js

Created April 17, 2021 21:00

NEAR Protocol - Sign TX as another account using an access key added to that account

	import * as nearAPI from 'near-api-js';

	const {
	Account,
	KeyPair,
	} = nearAPI;

	// near is your current near connection instance (somewhere in your app init)

	export const getAccessKeyAccount = (near, accountId, secretKey) => {

mattlockyer / near-base64.js

Last active April 16, 2023 23:23

NEAR Protocol - matching base64 strings in JS and Rust

	// JS (node - for browser you need to use btoa(String.fromCharCode(...new Uint8Array(...)))

	const hash = sha256.create();
	const hashesBase64 = [
	'some string'
	].map((src) => {
	return Buffer.from(hash.update(src).array()).toString('base64')
	})

mattlockyer / basics.js

Created June 5, 2021 00:03

NEAR Basics, Connect, Wallet, Account, Call Methods

	// new near instance (for NodeJS use InMemoryKeyStore)

	// do this once somewhere when app "mounts" or loads

	const near = new Near({
	networkId,
	nodeUrl,
	walletUrl,
	deps: {
	keyStore: new keyStores.BrowserLocalStorageKeyStore()