137 lines
4.5 KiB
TypeScript
137 lines
4.5 KiB
TypeScript
'use strict';
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// We use this for base 36 maths
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import BN from 'bn.js';
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import { arrayify, stripZeros, hexlify } from './bytes';
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import { keccak256 } from './keccak256';
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import { encode } from './rlp';
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import { Arrayish, BigNumber } from './types';
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import errors = require('./errors');
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function getChecksumAddress(address: string): string {
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if (typeof(address) !== 'string' || !address.match(/^0x[0-9A-Fa-f]{40}$/)) {
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errors.throwError('invalid address', errors.INVALID_ARGUMENT, { arg: 'address', value: address });
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}
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address = address.toLowerCase();
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let chars = address.substring(2).split('');
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let hashed = new Uint8Array(40);
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for (let i = 0; i < 40; i++) {
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hashed[i] = chars[i].charCodeAt(0);
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}
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hashed = arrayify(keccak256(hashed));
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for (var i = 0; i < 40; i += 2) {
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if ((hashed[i >> 1] >> 4) >= 8) {
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chars[i] = chars[i].toUpperCase();
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}
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if ((hashed[i >> 1] & 0x0f) >= 8) {
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chars[i + 1] = chars[i + 1].toUpperCase();
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}
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}
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return '0x' + chars.join('');
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}
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// Shims for environments that are missing some required constants and functions
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var MAX_SAFE_INTEGER: number = 0x1fffffffffffff;
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function log10(x: number): number {
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if (Math.log10) { return Math.log10(x); }
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return Math.log(x) / Math.LN10;
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}
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// See: https://en.wikipedia.org/wiki/International_Bank_Account_Number
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// Create lookup table
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var ibanLookup: { [character: string]: string } = {};
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for (var i = 0; i < 10; i++) { ibanLookup[String(i)] = String(i); }
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for (var i = 0; i < 26; i++) { ibanLookup[String.fromCharCode(65 + i)] = String(10 + i); }
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// How many decimal digits can we process? (for 64-bit float, this is 15)
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var safeDigits = Math.floor(log10(MAX_SAFE_INTEGER));
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function ibanChecksum(address: string): string {
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address = address.toUpperCase();
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address = address.substring(4) + address.substring(0, 2) + '00';
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var expanded = '';
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address.split('').forEach(function(c) {
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expanded += ibanLookup[c];
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});
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// Javascript can handle integers safely up to 15 (decimal) digits
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while (expanded.length >= safeDigits){
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var block = expanded.substring(0, safeDigits);
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expanded = parseInt(block, 10) % 97 + expanded.substring(block.length);
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}
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var checksum = String(98 - (parseInt(expanded, 10) % 97));
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while (checksum.length < 2) { checksum = '0' + checksum; }
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return checksum;
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};
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export function getAddress(address: string): string {
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var result = null;
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if (typeof(address) !== 'string') {
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errors.throwError('invalid address', errors.INVALID_ARGUMENT, { arg: 'address', value: address });
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}
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if (address.match(/^(0x)?[0-9a-fA-F]{40}$/)) {
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// Missing the 0x prefix
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if (address.substring(0, 2) !== '0x') { address = '0x' + address; }
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result = getChecksumAddress(address);
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// It is a checksummed address with a bad checksum
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if (address.match(/([A-F].*[a-f])|([a-f].*[A-F])/) && result !== address) {
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errors.throwError('bad address checksum', errors.INVALID_ARGUMENT, { arg: 'address', value: address });
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}
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// Maybe ICAP? (we only support direct mode)
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} else if (address.match(/^XE[0-9]{2}[0-9A-Za-z]{30,31}$/)) {
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// It is an ICAP address with a bad checksum
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if (address.substring(2, 4) !== ibanChecksum(address)) {
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errors.throwError('bad icap checksum', errors.INVALID_ARGUMENT, { arg: 'address', value: address });
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}
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result = (new BN.BN(address.substring(4), 36)).toString(16);
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while (result.length < 40) { result = '0' + result; }
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result = getChecksumAddress('0x' + result);
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} else {
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errors.throwError('invalid address', errors.INVALID_ARGUMENT, { arg: 'address', value: address });
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}
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return result;
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}
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export function getIcapAddress(address: string): string {
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var base36 = (new BN.BN(getAddress(address).substring(2), 16)).toString(36).toUpperCase();
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while (base36.length < 30) { base36 = '0' + base36; }
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return 'XE' + ibanChecksum('XE00' + base36) + base36;
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}
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// http://ethereum.stackexchange.com/questions/760/how-is-the-address-of-an-ethereum-contract-computed
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export function getContractAddress(transaction: { from: string, nonce: Arrayish | BigNumber | number }) {
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if (!transaction.from) { throw new Error('missing from address'); }
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var nonce = transaction.nonce;
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return getAddress('0x' + keccak256(encode([
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getAddress(transaction.from),
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stripZeros(hexlify(nonce))
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])).substring(26));
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}
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