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<?php /** * Helper class */ namespace Omnipay\Common; use InvalidArgumentException; /** * Helper class * * This class defines various static utility functions that are in use * throughout the Omnipay system. */ class Helper { /** * Convert a string to camelCase. Strings already in camelCase will not be harmed. * * @param string $str The input string * @return string camelCased output string */ public static function camelCase($str) { return preg_replace_callback( '/_([a-z])/', function ($match) { return strtoupper($match[1]); }, $str ); } /** * Validate a card number according to the Luhn algorithm. * * @param string $number The card number to validate * @return boolean True if the supplied card number is valid */ public static function validateLuhn($number) { $str = ''; foreach (array_reverse(str_split($number)) as $i => $c) { $str .= $i % 2 ? $c * 2 : $c; } return array_sum(str_split($str)) % 10 === 0; } /** * Initialize an object with a given array of parameters * * Parameters are automatically converted to camelCase. Any parameters which do * not match a setter on the target object are ignored. * * @param mixed $target The object to set parameters on * @param array $parameters An array of parameters to set */ public static function initialize($target, $parameters) { if (is_array($parameters)) { foreach ($parameters as $key => $value) { $method = 'set'.ucfirst(static::camelCase($key)); if (method_exists($target, $method)) { $target->$method($value); } } } } /** * Resolve a gateway class to a short name. * * The short name can be used with GatewayFactory as an alias of the gateway class, * to create new instances of a gateway. */ public static function getGatewayShortName($className) { if (0 === strpos($className, '\\')) { $className = substr($className, 1); } if (0 === strpos($className, 'Omnipay\\')) { return trim(str_replace('\\', '_', substr($className, 8, -7)), '_'); } return '\\'.$className; } /** * Resolve a short gateway name to a full namespaced gateway class. * * Class names beginning with a namespace marker (\) are left intact. * Non-namespaced classes are expected to be in the \Omnipay namespace, e.g.: * * \Custom\Gateway => \Custom\Gateway * \Custom_Gateway => \Custom_Gateway * Stripe => \Omnipay\Stripe\Gateway * PayPal\Express => \Omnipay\PayPal\ExpressGateway * PayPal_Express => \Omnipay\PayPal\ExpressGateway * * @param string $shortName The short gateway name * @return string The fully namespaced gateway class name */ public static function getGatewayClassName($shortName) { if (0 === strpos($shortName, '\\')) { return $shortName; } // replace underscores with namespace marker, PSR-0 style $shortName = str_replace('_', '\\', $shortName); if (false === strpos($shortName, '\\')) { $shortName .= '\\'; } return '\\Omnipay\\'.$shortName.'Gateway'; } /** * Convert an amount into a float. * The float datatype can then be converted into the string * format that the remote gateway requies. * * @var string|int|float $value The value to convert. * @throws InvalidArgumentException on a validation failure. * @return float The amount converted to a float. */ public static function toFloat($value) { if (!is_string($value) && !is_int($value) && !is_float($value)) { throw new InvalidArgumentException('Data type is not a valid decimal number.'); } if (is_string($value)) { // Validate generic number, with optional sign and decimals. if (!preg_match('/^[-]?[0-9]+(\.[0-9]*)?$/', $value)) { throw new InvalidArgumentException('String is not a valid decimal number.'); } } return (float)$value; } }
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