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<?php
namespace Drupal\Core\Form;
use Drupal\Component\Utility\Crypt;
use Drupal\Core\Access\CsrfTokenGenerator;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\KeyValueStore\KeyValueExpirableFactoryInterface;
use Drupal\Core\PageCache\RequestPolicyInterface;
use Drupal\Core\Session\AccountInterface;
use Psr\Log\LoggerInterface;
use Symfony\Component\HttpFoundation\RequestStack;
/**
* Encapsulates the caching of a form and its form state.
*
* @ingroup form_api
*/
class FormCache implements FormCacheInterface {
/**
* The factory for expirable key value stores used by form cache.
*
* @var \Drupal\Core\KeyValueStore\KeyValueExpirableFactoryInterface
*/
protected $keyValueExpirableFactory;
/**
* The CSRF token generator to validate the form token.
*
* @var \Drupal\Core\Access\CsrfTokenGenerator
*/
protected $csrfToken;
/**
* The current user.
*
* @var \Drupal\Core\Session\AccountInterface
*/
protected $currentUser;
/**
* The module handler.
*
* @var \Drupal\Core\Extension\ModuleHandlerInterface
*/
protected $moduleHandler;
/**
* Logger channel.
*
* @var \Drupal\Core\Logger\LoggerChannelInterface
*/
protected $logger;
/**
* The config factory.
*
* @var \Drupal\Core\Config\ConfigFactoryInterface
*/
protected $configFactory;
/**
* The request stack.
*
* @var \Symfony\Component\HttpFoundation\RequestStack
*/
protected $requestStack;
/**
* A policy rule determining the cacheability of a request.
*
* @var \Drupal\Core\PageCache\RequestPolicyInterface
*/
protected $requestPolicy;
/**
* The app root.
*
* @var string
*/
protected $root;
/**
* Constructs a new FormCache.
*
* @param string $root
* The app root.
* @param \Drupal\Core\KeyValueStore\KeyValueExpirableFactoryInterface $key_value_expirable_factory
* The key value expirable factory, used to create key value expirable
* stores for the form cache and form state cache.
* @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
* The module handler.
* @param \Drupal\Core\Session\AccountInterface $current_user
* The current user.
* @param \Drupal\Core\Access\CsrfTokenGenerator $csrf_token
* The CSRF token generator.
* @param \Psr\Log\LoggerInterface $logger
* A logger instance.
* @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
* The request stack.
* @param \Drupal\Core\PageCache\RequestPolicyInterface $request_policy
* A policy rule determining the cacheability of a request.
*/
public function __construct($root, KeyValueExpirableFactoryInterface $key_value_expirable_factory, ModuleHandlerInterface $module_handler, AccountInterface $current_user, CsrfTokenGenerator $csrf_token, LoggerInterface $logger, RequestStack $request_stack, RequestPolicyInterface $request_policy) {
$this->root = $root;
$this->keyValueExpirableFactory = $key_value_expirable_factory;
$this->moduleHandler = $module_handler;
$this->currentUser = $current_user;
$this->logger = $logger;
$this->csrfToken = $csrf_token;
$this->requestStack = $request_stack;
$this->requestPolicy = $request_policy;
}
/**
* {@inheritdoc}
*/
public function getCache($form_build_id, FormStateInterface $form_state) {
if ($form = $this->keyValueExpirableFactory->get('form')->get($form_build_id)) {
if ((isset($form['#cache_token']) && $this->csrfToken->validate($form['#cache_token'])) || (!isset($form['#cache_token']) && $this->currentUser->isAnonymous())) {
$this->loadCachedFormState($form_build_id, $form_state);
// Generate a new #build_id if the cached form was rendered on a
// cacheable page.
$build_info = $form_state->getBuildInfo();
if (!empty($build_info['immutable'])) {
$form['#build_id_old'] = $form['#build_id'];
$form['#build_id'] = 'form-' . Crypt::randomBytesBase64();
$form['form_build_id']['#value'] = $form['#build_id'];
$form['form_build_id']['#id'] = $form['#build_id'];
unset($build_info['immutable']);
$form_state->setBuildInfo($build_info);
}
return $form;
}
}
}
/**
* Loads the cached form state.
*
* @param string $form_build_id
* The unique form build ID.
* @param \Drupal\Core\Form\FormStateInterface $form_state
* The current state of the form.
*/
protected function loadCachedFormState($form_build_id, FormStateInterface $form_state) {
if ($stored_form_state = $this->keyValueExpirableFactory->get('form_state')->get($form_build_id)) {
// Re-populate $form_state for subsequent rebuilds.
$form_state->setFormState($stored_form_state);
// If the original form is contained in include files, load the files.
// @see \Drupal\Core\Form\FormStateInterface::loadInclude()
$build_info = $form_state->getBuildInfo();
$build_info += ['files' => []];
foreach ($build_info['files'] as $file) {
if (is_array($file)) {
$file += ['type' => 'inc', 'name' => $file['module']];
$this->moduleHandler->loadInclude($file['module'], $file['type'], $file['name']);
}
elseif (file_exists($file)) {
require_once $this->root . '/' . $file;
}
}
}
}
/**
* {@inheritdoc}
*/
public function setCache($form_build_id, $form, FormStateInterface $form_state) {
// 6 hours cache life time for forms should be plenty.
$expire = 21600;
// Ensure that the form build_id embedded in the form structure is the same
// as the one passed in as a parameter. This is an additional safety measure
// to prevent legacy code operating directly with
// \Drupal::formBuilder()->getCache() and \Drupal::formBuilder()->setCache()
// from accidentally overwriting immutable form state.
if (isset($form['#build_id']) && $form['#build_id'] != $form_build_id) {
$this->logger->error('Form build-id mismatch detected while attempting to store a form in the cache.');
return;
}
// Cache form structure.
if (isset($form)) {
if ($this->currentUser->isAuthenticated()) {
$form['#cache_token'] = $this->csrfToken->get();
}
unset($form['#build_id_old']);
$this->keyValueExpirableFactory->get('form')->setWithExpire($form_build_id, $form, $expire);
}
if ($data = $form_state->getCacheableArray()) {
$this->keyValueExpirableFactory->get('form_state')->setWithExpire($form_build_id, $data, $expire);
}
}
/**
* {@inheritdoc}
*/
public function deleteCache($form_build_id) {
$this->keyValueExpirableFactory->get('form')->delete($form_build_id);
$this->keyValueExpirableFactory->get('form_state')->delete($form_build_id);
}
}