Pashaster12 / laravel-crypto-stats

src/Services/EthereumValidator.php

<?php

namespace LaravelCryptoStats\Services;

class EthereumValidator
{
    /**
     * Checks if the given string is an address.
     *
     * @method isAddress
     *
     * @param {String} $address the given HEX adress

The doc comment {String} at position 0 could not be parsed: Unknown type name '{String}' at position 0 in {String}.

     *
     * @return {Boolean}

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     */
    public static function isAddress($address)
    {
        if (!preg_match('/^(0x)?[0-9a-f]{40}$/i', $address)) {
            // check if it has the basic requirements of an address
            return false;
        } elseif (!preg_match('/^(0x)?[0-9a-f]{40}$/', $address) || preg_match('/^(0x)?[0-9A-F]{40}$/', $address)) {
            // If it's all small caps or all all caps, return true
            return true;
        } else {
            // Otherwise check each case
            return self::isChecksumAddress($address);
        }
    }

    /**
     * Checks if the given string is a checksummed address.
     *
     * @method isChecksumAddress
     *
     * @param {String} $address the given HEX adress

The doc comment {String} at position 0 could not be parsed: Unknown type name '{String}' at position 0 in {String}.

     *
     * @return {Boolean}

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     */
    public static function isChecksumAddress($address)
    {
        // Check each case
        $address = str_replace('0x', '', $address);
        $addressHash = hash('sha3-256', strtolower($address));
        $addressArray = str_split($address);
        $addressHashArray = str_split($addressHash);

        for ($i = 0; $i < 40; $i++) {
            // the nth letter should be uppercase if the nth digit of casemap is 1
            if ((intval($addressHashArray[$i], 16) > 7 && strtoupper($addressArray[$i]) !== $addressArray[$i]) || (intval($addressHashArray[$i], 16) <= 7 && strtolower($addressArray[$i]) !== $addressArray[$i])) {
                return false;
            }
        }

        return true;
    }
}