134 lines
5.0 KiB
JavaScript
134 lines
5.0 KiB
JavaScript
"use strict";
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import { arrayify, concat, hexDataLength, hexDataSlice, isHexString, stripZeros } from "@ethersproject/bytes";
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import { BigNumber, _base16To36, _base36To16 } from "@ethersproject/bignumber";
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import { keccak256 } from "@ethersproject/keccak256";
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import { encode } from "@ethersproject/rlp";
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import { Logger } from "@ethersproject/logger";
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import { version } from "./_version";
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const logger = new Logger(version);
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function getChecksumAddress(address) {
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if (!isHexString(address, 20)) {
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logger.throwArgumentError("invalid address", "address", address);
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}
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address = address.toLowerCase();
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const chars = address.substring(2).split("");
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const expanded = new Uint8Array(40);
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for (let i = 0; i < 40; i++) {
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expanded[i] = chars[i].charCodeAt(0);
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}
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const hashed = arrayify(keccak256(expanded));
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for (let 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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const MAX_SAFE_INTEGER = 0x1fffffffffffff;
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function log10(x) {
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if (Math.log10) {
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return Math.log10(x);
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}
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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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const ibanLookup = {};
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for (let i = 0; i < 10; i++) {
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ibanLookup[String(i)] = String(i);
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}
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for (let i = 0; i < 26; i++) {
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ibanLookup[String.fromCharCode(65 + i)] = String(10 + i);
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}
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// How many decimal digits can we process? (for 64-bit float, this is 15)
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const safeDigits = Math.floor(log10(MAX_SAFE_INTEGER));
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function ibanChecksum(address) {
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address = address.toUpperCase();
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address = address.substring(4) + address.substring(0, 2) + "00";
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let expanded = address.split("").map((c) => { return ibanLookup[c]; }).join("");
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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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let 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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let checksum = String(98 - (parseInt(expanded, 10) % 97));
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while (checksum.length < 2) {
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checksum = "0" + checksum;
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}
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return checksum;
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}
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;
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export function getAddress(address) {
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let result = null;
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if (typeof (address) !== "string") {
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logger.throwArgumentError("invalid address", "address", address);
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}
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if (address.match(/^(0x)?[0-9a-fA-F]{40}$/)) {
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// Missing the 0x prefix
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if (address.substring(0, 2) !== "0x") {
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address = "0x" + address;
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}
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result = getChecksumAddress(address);
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// It is a checksummed address with a bad checksum
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if (address.match(/([A-F].*[a-f])|([a-f].*[A-F])/) && result !== address) {
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logger.throwArgumentError("bad address checksum", "address", address);
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}
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// Maybe ICAP? (we only support direct mode)
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}
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else if (address.match(/^XE[0-9]{2}[0-9A-Za-z]{30,31}$/)) {
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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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logger.throwArgumentError("bad icap checksum", "address", address);
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}
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result = _base36To16(address.substring(4));
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while (result.length < 40) {
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result = "0" + result;
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}
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result = getChecksumAddress("0x" + result);
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}
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else {
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logger.throwArgumentError("invalid address", "address", address);
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}
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return result;
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}
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export function isAddress(address) {
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try {
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getAddress(address);
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return true;
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}
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catch (error) { }
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return false;
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}
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export function getIcapAddress(address) {
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let base36 = _base16To36(getAddress(address).substring(2)).toUpperCase();
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while (base36.length < 30) {
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base36 = "0" + base36;
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}
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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) {
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let from = null;
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try {
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from = getAddress(transaction.from);
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}
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catch (error) {
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logger.throwArgumentError("missing from address", "transaction", transaction);
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}
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const nonce = stripZeros(arrayify(BigNumber.from(transaction.nonce).toHexString()));
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return getAddress(hexDataSlice(keccak256(encode([from, nonce])), 12));
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}
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export function getCreate2Address(from, salt, initCodeHash) {
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if (hexDataLength(salt) !== 32) {
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logger.throwArgumentError("salt must be 32 bytes", "salt", salt);
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}
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if (hexDataLength(initCodeHash) !== 32) {
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logger.throwArgumentError("initCodeHash must be 32 bytes", "initCodeHash", initCodeHash);
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}
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return getAddress(hexDataSlice(keccak256(concat(["0xff", getAddress(from), salt, initCodeHash])), 12));
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}
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//# sourceMappingURL=index.js.map
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