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import { addHexPrefix, sha3, stripHexPrefix } from 'ethereumjs-util';
import * as jsSHA3 from 'js-sha3';
import * as _ from 'lodash';
import { BigNumber } from './configured_bignumber';
const BASIC_ADDRESS_REGEX = /^(0x)?[0-9a-f]{40}$/i;
const SAME_CASE_ADDRESS_REGEX = /^(0x)?([0-9a-f]{40}|[0-9A-F]{40})$/;
const ADDRESS_LENGTH = 40;
const MAX_DIGITS_IN_UNSIGNED_256_INT = 78;
export const addressUtils = {
isChecksumAddress(address: string): boolean {
// Check each case
const unprefixedAddress = address.replace('0x', '');
const addressHash = jsSHA3.keccak256(unprefixedAddress.toLowerCase());
for (let i = 0; i < ADDRESS_LENGTH; i++) {
// The nth letter should be uppercase if the nth digit of casemap is 1
const hexBase = 16;
const lowercaseRange = 7;
if (
(parseInt(addressHash[i], hexBase) > lowercaseRange &&
unprefixedAddress[i].toUpperCase() !== unprefixedAddress[i]) ||
(parseInt(addressHash[i], hexBase) <= lowercaseRange &&
unprefixedAddress[i].toLowerCase() !== unprefixedAddress[i])
) {
return false;
}
}
return true;
},
isAddress(address: string): boolean {
if (!BASIC_ADDRESS_REGEX.test(address)) {
// Check if it has the basic requirements of an address
return false;
} else if (SAME_CASE_ADDRESS_REGEX.test(address)) {
// If it's all small caps or all all caps, return true
return true;
} else {
// Otherwise check each case
const isValidChecksummedAddress = addressUtils.isChecksumAddress(address);
return isValidChecksummedAddress;
}
},
padZeros(address: string): string {
return addHexPrefix(_.padStart(stripHexPrefix(address), ADDRESS_LENGTH, '0'));
},
/**
* Generates a pseudo-random 256-bit salt.
* The salt can be included in a 0x order, ensuring that the order generates a unique orderHash
* and will not collide with other outstanding orders that are identical in all other parameters.
* @return A pseudo-random 256-bit number that can be used as a salt.
*/
generatePseudoRandomSalt(): BigNumber {
// BigNumber.random returns a pseudo-random number between 0 & 1 with a passed in number of decimal places.
// Source: https://mikemcl.github.io/bignumber.js/#random
const randomNumber = BigNumber.random(MAX_DIGITS_IN_UNSIGNED_256_INT);
const factor = new BigNumber(10).pow(MAX_DIGITS_IN_UNSIGNED_256_INT - 1);
const salt = randomNumber.times(factor);
return salt;
},
generatePseudoRandomAddress(): string {
const randomBigNum = addressUtils.generatePseudoRandomSalt();
const randomBuff = sha3(randomBigNum.toString());
const addressLengthInBytes = 20;
const randomAddress = `0x${randomBuff.slice(0, addressLengthInBytes).toString('hex')}`;
return randomAddress;
},
};
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