@tangany/waas/test/helpers.js

node.js SDK for Tangany Wallet as a Service API

/**
 * generates a random hex string with given length
 * @param length text string length
 */
const getRandomHex = (length = 40) => {
	let text = "";
	const possible = "abcdef0123456789";
	for (let i = 0; i < length; i++) {
		text += possible.charAt(Math.floor(Math.random() * possible.length));
	}

	return text;
};

/**
 * generates a sequence of random Ethereum addresses
 * @example
 * const gen = getRandomEthereumAddress();
 * console.log(ethereumAddressGen.next().value); //0x90dab67ffff1ffffffffffffffffffffffffffff
 * console.log(ethereumAddressGen.next().value); //0x90dab67ffff2ffffffffffffffffffffffffffff
 * console.log(ethereumAddressGen.next().value); //0x90dab67ffff3ffffffffffffffffffffffffffff  ... and so on
 */
function * getRandomEthereumAddress (skip = false) {
	const oneTimeRandNumbers = getRandomHex(7);
	let i = 0;

	while (true) {
		if (!skip) {
			i++;
		}
		yield `0x${oneTimeRandNumbers}ffff${i.toString(10).padEnd(29, "f")}`;
	}
}

/**
 * checks for the WaaS authentication headers in the environment variables and throws an error if not present
 */
function checkEnvVars(){
	console.info("this suite only works with a pre-set .env file with api credentials in project's root");
	["TANGANY_CLIENT_ID", "TANGANY_CLIENT_SECRET", "TANGANY_SUBSCRIPTION", "TANGANY_VAULT_URL", "E2E_WALLET", "E2E_TOKEN"].map(v => {
		if (!process.env[v]) {
			throw new Error(`process.env.${v} not defined`);
		}
	});
}

module.exports = {
	getRandomEthereumAddress,
	getRandomHex,
	checkEnvVars,
};