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<?php
namespace Drupal\Core\Path;
use Drupal\Core\Cache\CacheBackendInterface;
use Drupal\Core\Cache\CacheCollector;
use Drupal\Core\State\StateInterface;
use Drupal\Core\Lock\LockBackendInterface;
/**
* Extends CacheCollector to build the path alias whitelist over time.
*/
class AliasWhitelist extends CacheCollector implements AliasWhitelistInterface {
/**
* The Key/Value Store to use for state.
*
* @var \Drupal\Core\State\StateInterface
*/
protected $state;
/**
* The Path CRUD service.
*
* @var \Drupal\Core\Path\AliasStorageInterface
*/
protected $aliasStorage;
/**
* Constructs an AliasWhitelist object.
*
* @param string $cid
* The cache id to use.
* @param \Drupal\Core\Cache\CacheBackendInterface $cache
* The cache backend.
* @param \Drupal\Core\Lock\LockBackendInterface $lock
* The lock backend.
* @param \Drupal\Core\State\StateInterface $state
* The state keyvalue store.
* @param \Drupal\Core\Path\AliasStorageInterface $alias_storage
* The alias storage service.
*/
public function __construct($cid, CacheBackendInterface $cache, LockBackendInterface $lock, StateInterface $state, AliasStorageInterface $alias_storage) {
parent::__construct($cid, $cache, $lock);
$this->state = $state;
$this->aliasStorage = $alias_storage;
}
/**
* {@inheritdoc}
*/
protected function lazyLoadCache() {
parent::lazyLoadCache();
// On a cold start $this->storage will be empty and the whitelist will
// need to be rebuilt from scratch. The whitelist is initialized from the
// list of all valid path roots stored in the 'router.path_roots' state,
// with values initialized to NULL. During the request, each path requested
// that matches one of these keys will be looked up and the array value set
// to either TRUE or FALSE. This ensures that paths which do not exist in
// the router are not looked up, and that paths that do exist in the router
// are only looked up once.
if (empty($this->storage)) {
$this->loadMenuPathRoots();
}
}
/**
* Loads menu path roots to prepopulate cache.
*/
protected function loadMenuPathRoots() {
if ($roots = $this->state->get('router.path_roots')) {
foreach ($roots as $root) {
$this->storage[$root] = NULL;
$this->persist($root);
}
}
}
/**
* {@inheritdoc}
*/
public function get($offset) {
$this->lazyLoadCache();
// this may be called with paths that are not represented by menu router
// items such as paths that will be rewritten by hook_url_outbound_alter().
// Therefore internally TRUE is used to indicate whitelisted paths. FALSE is
// used to indicate paths that have already been checked but are not
// whitelisted, and NULL indicates paths that have not been checked yet.
if (isset($this->storage[$offset])) {
if ($this->storage[$offset]) {
return TRUE;
}
}
elseif (array_key_exists($offset, $this->storage)) {
return $this->resolveCacheMiss($offset);
}
}
/**
* {@inheritdoc}
*/
public function resolveCacheMiss($root) {
$exists = $this->aliasStorage->pathHasMatchingAlias('/' . $root);
$this->storage[$root] = $exists;
$this->persist($root);
if ($exists) {
return TRUE;
}
}
/**
* {@inheritdoc}
*/
public function clear() {
parent::clear();
$this->loadMenuPathRoots();
}
}