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<?php
namespace Bitrix\Sale\Discount\Preset;
use Bitrix\Main\HttpRequest;
use Bitrix\Main\Type\Dictionary;
use Bitrix\Main\Security\Sign\Signer;
final class State extends Dictionary
{
private const STATE_NAME_VAR = '__state';
private const CHAIN_NAME_VAR = '__chain';
private const STATE_SIGNER_SALT = 'discount.preset.state';
/** @var Signer */
private $signer = null;
/**
* State constructor.
* @param array $values
*/
public function __construct(array $values = null)
{
parent::__construct($values);
$this->setDefaultValues();
$this->initSigner();
}
private function setDefaultValues()
{
if(empty($this[self::CHAIN_NAME_VAR]))
{
$this[self::CHAIN_NAME_VAR] = array();
}
}
private function initSigner(): void
{
$this->signer = new Signer();
}
private function sign(string $data): string
{
return $this->signer->sign($data, self::STATE_SIGNER_SALT);
}
public function unSign(string $data): string
{
try
{
$signedData = $this->signer->unsign($data, self::STATE_SIGNER_SALT);
}
catch(\Bitrix\Main\Security\Sign\BadSignatureException $e)
{
die('Bad signature.');
}
return $signedData;
}
public function set($name, $value = null)
{
parent::set($name, $value);
$this->setDefaultValues();
return $this;
}
public function append(array $values)
{
foreach($values as $name => $value)
{
$this[$name] = $value;
}
return $this;
}
/**
* @param string $name
* @param callable|null $defaultValue
*
* @return null|string|array
*/
public function get($name, $defaultValue = null)
{
$value = parent::get($name);
if ($defaultValue && is_callable($defaultValue))
{
return $defaultValue($value);
}
return $value !== null? $value : $defaultValue;
}
public static function createFromEncodedData($data)
{
$state = new State;
if(empty($data))
{
return $state;
}
$data = $state->unSign($data);
$data = base64_decode($data);
if($data === false)
{
return $state;
}
$data = unserialize($data, ['allowed_classes' => ['Bitrix\Main\Type\DateTime', 'DateTime']]);
return $state->set($data?: array());
}
public static function createFromRequest(HttpRequest $request)
{
$prevState = self::createFromEncodedData($request->getPost(self::STATE_NAME_VAR));
$postData = array();
foreach($request->getPostList()->toArray() as $name => $data)
{
if(is_array($data) && count($data) === 1 && ($data[0] !== '0' && empty($data[0])))
{
//empty array
unset($prevState[$name]);
continue;
}
if(is_array($data) && ($data[0] !== '0' && empty($data[0])))
{
unset($data[0]);
}
$postData[$name] = $data;
}
return new State(array_merge($prevState->toArray(), $postData));
}
public function addStepChain($step)
{
$chain = $this[self::CHAIN_NAME_VAR];
$lastStep = end($chain);
if($lastStep != $step)
{
$chain[] = $step;
$this[self::CHAIN_NAME_VAR] = $chain;
}
return $this;
}
public function popStepChain()
{
$chain = $this[self::CHAIN_NAME_VAR];
$step = array_pop($chain);
$this[self::CHAIN_NAME_VAR] = $chain;
return $step;
}
public function getPrevStep()
{
return end($this[self::CHAIN_NAME_VAR]);
}
private function getStepChain(): array
{
return $this->get(self::CHAIN_NAME_VAR, array());
}
public function __toString()
{
$data = $this->toArray();
$value = $this->sign(base64_encode(serialize($data)));
return '<input type="hidden" name="' . self::STATE_NAME_VAR . '" value="' . $value . '">';
}
public function toString()
{
return $this->__toString();
}
public function toArray()
{
$toArray = parent::toArray();
unset(
$toArray['sessid'],
$toArray['lang'],
$toArray['__next_step']
);
return $toArray;
}
public function getStepNumber()
{
$countPrevSteps = count($this->getStepChain());
return $countPrevSteps + 1;
}
}