laborefugiat
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Ethereum address React Component
41 lines (39 loc) • 1.29 kB
JavaScript
/**
* Checks if the given string is an address
*
* @method isAddress
* @param {String} address the given HEX adress
* @return {Boolean}
*/
export const isAddress = (address) => {
if (!/^(0x)?[0-9a-f]{40}$/i.test(address)) {
// check if it has the basic requirements of an address
return false;
} else if (/^(0x)?[0-9a-f]{40}$/.test(address) || /^(0x)?[0-9A-F]{40}$/.test(address)) {
// If it's all small caps or all all caps, return true
return true;
} else {
// Otherwise check each case
return isChecksumAddress(address);
}
};
/**
* Checks if the given string is a checksummed address
*
* @method isChecksumAddress
* @param {String} address the given HEX adress
* @return {Boolean}
*/
export const isChecksumAddress = (address) => {
// Check each case
address = address.replace('0x','');
var addressHash = sha3(address.toLowerCase());
for (var i = 0; i < 40; i++ ) {
// the nth letter should be uppercase if the nth digit of casemap is 1
if ((parseInt(addressHash[i], 16) > 7 && address[i].toUpperCase() !== address[i])
|| (parseInt(addressHash[i], 16) <= 7 && address[i].toLowerCase() !== address[i])) {
return false;
}
}
return true;
};