ethers.js/src/utils/address.js

'use strict';
Object.defineProperty(exports, "__esModule", { value: true });
// We use this for base 36 maths
var BN = require("bn.js");
var convert_1 = require("./convert");
var keccak256_1 = require("./keccak256");
var rlp_1 = require("./rlp");
var errors = require("./errors");
function getChecksumAddress(address) {
    if (typeof (address) !== 'string' || !address.match(/^0x[0-9A-Fa-f]{40}$/)) {
        errors.throwError('invalid address', errors.INVALID_ARGUMENT, { arg: 'address', value: address });
    }
    address = address.toLowerCase();
    var chars = address.substring(2).split('');
    var hashed = new Uint8Array(40);
    for (var i_1 = 0; i_1 < 40; i_1++) {
        hashed[i_1] = chars[i_1].charCodeAt(0);
    }
    hashed = convert_1.arrayify(keccak256_1.keccak256(hashed));
    for (var i = 0; i < 40; i += 2) {
        if ((hashed[i >> 1] >> 4) >= 8) {
            chars[i] = chars[i].toUpperCase();
        }
        if ((hashed[i >> 1] & 0x0f) >= 8) {
            chars[i + 1] = chars[i + 1].toUpperCase();
        }
    }
    return '0x' + chars.join('');
}
// Shims for environments that are missing some required constants and functions
var MAX_SAFE_INTEGER = 0x1fffffffffffff;
function log10(x) {
    if (Math.log10) {
        return Math.log10(x);
    }
    return Math.log(x) / Math.LN10;
}
// See: https://en.wikipedia.org/wiki/International_Bank_Account_Number
// Create lookup table
var ibanLookup = {};
for (var i = 0; i < 10; i++) {
    ibanLookup[String(i)] = String(i);
}
for (var i = 0; i < 26; i++) {
    ibanLookup[String.fromCharCode(65 + i)] = String(10 + i);
}
// How many decimal digits can we process? (for 64-bit float, this is 15)
var safeDigits = Math.floor(log10(MAX_SAFE_INTEGER));
function ibanChecksum(address) {
    address = address.toUpperCase();
    address = address.substring(4) + address.substring(0, 2) + '00';
    var expanded = '';
    address.split('').forEach(function (c) {
        expanded += ibanLookup[c];
    });
    // Javascript can handle integers safely up to 15 (decimal) digits
    while (expanded.length >= safeDigits) {
        var block = expanded.substring(0, safeDigits);
        expanded = parseInt(block, 10) % 97 + expanded.substring(block.length);
    }
    var checksum = String(98 - (parseInt(expanded, 10) % 97));
    while (checksum.length < 2) {
        checksum = '0' + checksum;
    }
    return checksum;
}
;
function getAddress(address) {
    var result = null;
    if (typeof (address) !== 'string') {
        errors.throwError('invalid address', errors.INVALID_ARGUMENT, { arg: 'address', value: address });
    }
    if (address.match(/^(0x)?[0-9a-fA-F]{40}$/)) {
        // Missing the 0x prefix
        if (address.substring(0, 2) !== '0x') {
            address = '0x' + address;
        }
        result = getChecksumAddress(address);
        // It is a checksummed address with a bad checksum
        if (address.match(/([A-F].*[a-f])|([a-f].*[A-F])/) && result !== address) {
            errors.throwError('bad address checksum', errors.INVALID_ARGUMENT, { arg: 'address', value: address });
        }
        // Maybe ICAP? (we only support direct mode)
    }
    else if (address.match(/^XE[0-9]{2}[0-9A-Za-z]{30,31}$/)) {
        // It is an ICAP address with a bad checksum
        if (address.substring(2, 4) !== ibanChecksum(address)) {
            errors.throwError('bad icap checksum', errors.INVALID_ARGUMENT, { arg: 'address', value: address });
        }
        result = (new BN(address.substring(4), 36)).toString(16);
        while (result.length < 40) {
            result = '0' + result;
        }
        result = getChecksumAddress('0x' + result);
    }
    else {
        errors.throwError('invalid address', errors.INVALID_ARGUMENT, { arg: 'address', value: address });
    }
    return result;
}
exports.getAddress = getAddress;
function getIcapAddress(address) {
    var base36 = (new BN(getAddress(address).substring(2), 16)).toString(36).toUpperCase();
    while (base36.length < 30) {
        base36 = '0' + base36;
    }
    return 'XE' + ibanChecksum('XE00' + base36) + base36;
}
exports.getIcapAddress = getIcapAddress;
// http://ethereum.stackexchange.com/questions/760/how-is-the-address-of-an-ethereum-contract-computed
function getContractAddress(transaction) {
    if (!transaction.from) {
        throw new Error('missing from address');
    }
    var nonce = transaction.nonce;
    return getAddress('0x' + keccak256_1.keccak256(rlp_1.encode([
        getAddress(transaction.from),
        convert_1.stripZeros(convert_1.hexlify(nonce))
    ])).substring(26));
}
exports.getContractAddress = getContractAddress;