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utils.js
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utils.js
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import filter from 'lodash/filter';
import isArray from 'lodash/isArray';
import isFunction from 'lodash/isFunction';
import isUndefined from 'lodash/isUndefined';
import includes from 'lodash/includes';
import isNull from 'lodash/isNull';
import sampleSize from 'lodash/sampleSize';
import size from 'lodash/size';
import URL from 'url-parse';
import { BigNumber } from 'bignumber.js';
import { iota } from './index';
import { isNodeHealthy } from './extendedApi';
import { NODELIST_URL, MAX_REQUEST_TIMEOUT } from '../../config';
import Errors from '../errors';
export const MAX_SEED_LENGTH = 81;
export const MAX_SEED_TRITS = MAX_SEED_LENGTH * 3;
export const SEED_CHECKSUM_LENGTH = 3;
export const ADDRESS_LENGTH_WITHOUT_CHECKSUM = MAX_SEED_LENGTH;
export const ADDRESS_LENGTH = 90;
export const CHECKSUM_LENGTH = ADDRESS_LENGTH - ADDRESS_LENGTH_WITHOUT_CHECKSUM;
export const VALID_SEED_REGEX = /^[A-Z9]+$/;
export const VALID_ADDRESS_WITHOUT_CHECKSUM_REGEX = VALID_SEED_REGEX;
export const VALID_ADDRESS_WITH_CHECKSUM_REGEX = /^[A-Z9]{90}$/;
export const TOTAL_IOTA_SUPPLY = 2779530283277761;
export const HASH_SIZE = 81;
export const TRANSACTION_TRYTES_SIZE = 2673;
export const EMPTY_HASH_TRYTES = '9'.repeat(HASH_SIZE);
export const EMPTY_TRANSACTION_TRYTES = '9'.repeat(TRANSACTION_TRYTES_SIZE);
export const EMPTY_TRANSACTION_MESSAGE = 'Empty';
export const IOTA_DENOMINATIONS = ['i', 'Ki', 'Mi', 'Gi', 'Ti'];
/**
* Converts trytes to bytes
*
* @method convertFromTrytes
* @param {string} trytes
*
* @returns {string}
*/
export const convertFromTrytes = (trytes) => {
const trytesWithoutNines = trytes.replace(/9+$/, '');
const message = iota.utils.fromTrytes(trytesWithoutNines);
/* eslint-disable no-control-regex */
if (trytesWithoutNines && message && /^[\x00-\xFF]*$/.test(message)) {
return message;
}
/* eslint-enable no-control-regex */
return EMPTY_TRANSACTION_MESSAGE;
};
/**
* Gets checksum.
*
* @method getChecksum
*
* @param {string | array} input - seed trytes | seed trits
* @param {number} [length]
*
* @returns {string | array}
*/
export const getChecksum = (
input,
// Trinity trytes to trits conversion creates Int8Array
length = isArray(input) || input instanceof Int8Array ? SEED_CHECKSUM_LENGTH * 3 : SEED_CHECKSUM_LENGTH,
) => {
return iota.utils
.addChecksum(
// https://github.com/iotaledger/iota.js/blob/develop/lib/utils/utils.js#L64
// iota.lib.js throws an exception for typed arrays
input instanceof Int8Array ? Array.from(input) : input,
length,
false,
)
.slice(-length);
};
/**
* Checks if a seed is valid
*
* @method isValidSeed
* @param {string} seed
*
* @returns {boolean}
*/
export const isValidSeed = (seed) => seed.length === MAX_SEED_LENGTH && seed.match(VALID_SEED_REGEX);
/**
* Formats IOTA value
*
* @method formatValue
* @param {number} value
*
* @returns {number}
*/
export const formatValue = (value) => {
let negative = false;
if (value < 0) {
negative = true;
value = -value;
}
switch (true) {
case value < 1000:
break;
case value < 1000000:
value /= 1000;
break;
case value < 1000000000:
value /= 1000000;
break;
case value < 1000000000000:
value /= 1000000000;
break;
default:
value /= 1000000000000;
break;
}
if (negative === true) {
return -value;
}
return value;
};
/**
* Gets relevant denomination for provided IOTA value
*
* @method formatUnit
* @param {number} value
*
* @returns {string}
*/
export const formatUnit = (value) => {
if (value < 0) {
value = -value;
}
switch (true) {
case value < 1000:
return 'i';
case value < 1000000:
return 'Ki';
case value < 1000000000:
return 'Mi';
case value < 1000000000000:
return 'Gi';
default:
return 'Ti';
}
};
/**
* Formats IOTA value and assigns appropriate unit
*
* @method formatIota
* @param {number} value
*
* @returns {string}
*/
export function formatIota(value) {
const iota = formatValue(value);
const unit = formatUnit(value);
return `${iota} ${unit}`;
}
/**
* Checks if provided server address is valid
*
* @method isValidServerAddress
* @param {string} server
*
* @returns {boolean}
*/
export const isValidServerAddress = (server) => {
if (!server.startsWith('http://') && !server.startsWith('https://')) {
return false;
}
return true;
};
/**
* Checks if provided IOTA address is valid
*
* @method isValidAddress
* @param {string} address
*
* @returns {boolean}
*/
export const isValidAddress = (address) => {
if (!isNull(address.match(VALID_SEED_REGEX))) {
return size(address) === 90 && iota.utils.isValidChecksum(address);
}
return false;
};
/**
* Checks if the last trit is 0
*
* @method isLastTritZero
* @param {string} address
*
* @returns {boolean}
*/
export const isLastTritZero = (address) => !/[E-V]/.test(address.slice(80, 81));
/**
* Checks if provided IOTA message is valid
*
* @method isValidMessage
* @param {string} message
*
* @returns {boolean}
*/
export const isValidMessage = (message) => {
return iota.utils.fromTrytes(iota.utils.toTrytes(message)) === message;
};
/**
* Checks if provided amount is valid
*
* @method isValidAmount
* @param {string|number} amount
* @param {number} multiplier
* @param {boolean} isFiat
*
* @returns {boolean}
*/
export const isValidAmount = (amount, multiplier, isFiat = false) => {
const value = new BigNumber(parseFloat(amount)).times(new BigNumber(multiplier)).toNumber();
// For sending a message
if (amount === '') {
return true;
}
// Ensure iota value is an integer
if (!isFiat) {
if (value % 1 !== 0) {
return false;
}
}
if (value < 0) {
return false;
}
return !isNaN(amount);
};
/**
* @typedef {Object} ParsedURL
* @property {string} address The parsed address
* @property {string} message The parsed message
* @property {number} amount The parsed amount
*/
/** Parse an IOTA address input
* @param {string} input
* @returns {ParsedURL} - The parsed address, message and/or amount values
*/
export const parseAddress = (input) => {
const result = {
address: null,
message: null,
amount: null,
};
if (!input || typeof input !== 'string') {
return null;
}
if (input.match(VALID_ADDRESS_WITH_CHECKSUM_REGEX)) {
result.address = input;
return result;
}
try {
let parsed = {
address: null,
message: null,
amount: null,
};
if (input.toLowerCase().indexOf('iota:') === 0) {
const url = new URL(input, true);
parsed.address = url.hostname.toUpperCase();
parsed.message = url.query.message;
parsed.amount = url.query.amount;
} else {
parsed = JSON.parse(input);
}
if (parsed.address.match(VALID_ADDRESS_WITH_CHECKSUM_REGEX)) {
result.address = parsed.address;
} else {
return null;
}
if (parsed.message && typeof parsed.message === 'string') {
result.message = parsed.message;
}
if (parsed.amount && String(parsed.amount) === String(parseInt(parsed.amount, 10))) {
result.amount = Math.abs(parseInt(parsed.amount, 10));
}
} catch (error) {
return null;
}
return result;
};
/**
* Retry IOTA api calls on different nodes
*
* @method withRetriesOnDifferentNodes
*
* @param {array} nodes
* @param {array|function} [failureCallbacks]
*
* @returns {function(function): function(...[*]): Promise}
*/
export const withRetriesOnDifferentNodes = (nodes, failureCallbacks) => {
let attempt = 0;
let executedCallback = false;
const retries = size(nodes);
return (promiseFunc) => {
const execute = (...args) => {
if (isUndefined(nodes[attempt])) {
return Promise.reject(new Error(Errors.NO_NODE_TO_RETRY));
}
return promiseFunc(nodes[attempt])(...args)
.then((result) => ({ node: nodes[attempt], result }))
.catch((err) => {
// Abort retries on user cancalled Ledger action
if (err === Errors.LEDGER_CANCELLED) {
throw new Error(Errors.LEDGER_CANCELLED);
}
// If a function is passed as failure callback
// Just trigger it once.
if (isFunction(failureCallbacks)) {
if (!executedCallback) {
executedCallback = true;
failureCallbacks();
}
// If an array of functions is passed
// Execute callback on each failure
} else if (isArray(failureCallbacks)) {
if (isFunction(failureCallbacks[attempt])) {
failureCallbacks[attempt]();
}
}
attempt += 1;
if (attempt < retries) {
return execute(...args);
}
throw err;
});
};
return execute;
};
};
/**
* Fetches list of IRI nodes from a server
*
* @method fetchRemoteNodes
* @param {string} [url]
* @param {object} [options]
*
* @returns {Promise<*>}
*/
export const fetchRemoteNodes = (
url = NODELIST_URL,
options = {
headers: {
Accept: 'application/json',
},
},
) =>
fetch(url, options)
.then((response) => response.json())
.then((response) => {
if (isArray(response)) {
return response.filter((node) => typeof node.node === 'string' && node.node.indexOf('https://') === 0);
}
return [];
});
/**
* Gets random nodes.
*
* @method getRandomNodes
* @param {array} nodes
* @param {number} [size]
* @param {array} [blacklisted]
*
* @returns {Array}
*/
export const getRandomNodes = (nodes, size = 5, blacklisted = []) => {
return sampleSize(filter(nodes, (node) => !includes(blacklisted, node)), size);
};
/**
* Throws an error if a node is not synced.
*
* @method throwIfNodeNotHealthy
* @param {string} provider
*
* @returns {Promise<boolean>}
*/
export const throwIfNodeNotHealthy = (provider) => {
return isNodeHealthy(provider).then((isSynced) => {
if (!isSynced) {
throw new Error(Errors.NODE_NOT_SYNCED);
}
return isSynced;
});
};
/**
* Handles timeouts for network requests made to IRI nodes
* Catches "request timeout" exceptions and retries network request with increased timeout
* See (https://github.com/iotaledger/iota.js/blob/master/lib/utils/makeRequest.js#L115)
*
* @method withRequestTimeoutsHandler
*
* @param {number} timeout
*
* @returns {function}
*/
export const withRequestTimeoutsHandler = (timeout) => {
let attempt = 1;
const getNextTimeout = () => attempt * timeout;
const handleTimeout = (promiseFunc) => {
return promiseFunc(getNextTimeout()).catch((error) => {
attempt += 1;
if (
(includes(error.message, Errors.REQUEST_TIMED_OUT) ||
includes(error.message, Errors.REQUEST_TIMED_OUT.toLowerCase())) &&
getNextTimeout() < MAX_REQUEST_TIMEOUT
) {
return handleTimeout(promiseFunc);
}
throw error;
});
};
return handleTimeout;
};