--- /dev/null
+<?php
+
+namespace Drupal\redirect;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Database\Connection;
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\Language\Language;
+use Drupal\redirect\Entity\Redirect;
+use Drupal\redirect\Exception\RedirectLoopException;
+
+class RedirectRepository {
+
+ /**
+ * @var \Drupal\Core\Entity\EntityManagerInterface
+ */
+ protected $manager;
+
+ /**
+ * @var \Drupal\Core\Database\Connection
+ */
+ protected $connection;
+
+ /**
+ * @var \Drupal\Core\Config\ImmutableConfig
+ */
+ protected $config;
+
+ /**
+ * An array of found redirect IDs to avoid recursion.
+ *
+ * @var array
+ */
+ protected $foundRedirects = [];
+
+ /**
+ * Constructs a \Drupal\redirect\EventSubscriber\RedirectRequestSubscriber object.
+ *
+ * @param \Drupal\Core\Entity\EntityManagerInterface $manager
+ * The entity manager service.
+ * @param \Drupal\Core\Database\Connection $connection
+ * The database connection.
+ */
+ public function __construct(EntityManagerInterface $manager, Connection $connection, ConfigFactoryInterface $config_factory) {
+ $this->manager = $manager;
+ $this->connection = $connection;
+ $this->config = $config_factory->get('redirect.settings');
+ }
+
+ /**
+ * Gets a redirect for given path, query and language.
+ *
+ * @param string $source_path
+ * The redirect source path.
+ * @param array $query
+ * The redirect source path query.
+ * @param $language
+ * The language for which is the redirect.
+ *
+ * @return \Drupal\redirect\Entity\Redirect
+ * The matched redirect entity.
+ *
+ * @throws \Drupal\redirect\Exception\RedirectLoopException
+ */
+ public function findMatchingRedirect($source_path, array $query = [], $language = Language::LANGCODE_NOT_SPECIFIED) {
+ $hashes = [Redirect::generateHash($source_path, $query, $language)];
+ if ($language != Language::LANGCODE_NOT_SPECIFIED) {
+ $hashes[] = Redirect::generateHash($source_path, $query, Language::LANGCODE_NOT_SPECIFIED);
+ }
+
+ // Add a hash without the query string if using passthrough querystrings.
+ if (!empty($query) && $this->config->get('passthrough_querystring')) {
+ $hashes[] = Redirect::generateHash($source_path, [], $language);
+ if ($language != Language::LANGCODE_NOT_SPECIFIED) {
+ $hashes[] = Redirect::generateHash($source_path, [], Language::LANGCODE_NOT_SPECIFIED);
+ }
+ }
+
+ // Load redirects by hash. A direct query is used to improve performance.
+ $rid = $this->connection->query('SELECT rid FROM {redirect} WHERE hash IN (:hashes[]) ORDER BY LENGTH(redirect_source__query) DESC', [':hashes[]' => $hashes])->fetchField();
+
+ if (!empty($rid)) {
+ // Check if this is a loop.
+ if (in_array($rid, $this->foundRedirects)) {
+ throw new RedirectLoopException('/' . $source_path, $rid);
+ }
+ $this->foundRedirects[] = $rid;
+
+ $redirect = $this->load($rid);
+
+ // Find chained redirects.
+ if ($recursive = $this->findByRedirect($redirect, $language)) {
+ // Reset found redirects.
+ $this->foundRedirects = [];
+ return $recursive;
+ }
+
+ return $redirect;
+ }
+
+ return NULL;
+ }
+
+ /**
+ * Helper function to find recursive redirects.
+ *
+ * @param \Drupal\redirect\Entity\Redirect
+ * The redirect object.
+ * @param string $language
+ * The language to use.
+ */
+ protected function findByRedirect(Redirect $redirect, $language) {
+ $uri = $redirect->getRedirectUrl();
+ $baseUrl = \Drupal::request()->getBaseUrl();
+ $path = ltrim(substr($uri->toString(), strlen($baseUrl)), '/');
+ $query = $uri->getOption('query') ?: [];
+ return $this->findMatchingRedirect($path, $query, $language);
+ }
+
+ /**
+ * Finds redirects based on the source path.
+ *
+ * @param string $source_path
+ * The redirect source path (without the query).
+ *
+ * @return \Drupal\redirect\Entity\Redirect[]
+ * Array of redirect entities.
+ */
+ public function findBySourcePath($source_path) {
+ $ids = $this->manager->getStorage('redirect')->getQuery()
+ ->condition('redirect_source.path', $source_path, 'LIKE')
+ ->execute();
+ return $this->manager->getStorage('redirect')->loadMultiple($ids);
+ }
+
+ /**
+ * Load redirect entity by id.
+ *
+ * @param int $redirect_id
+ * The redirect id.
+ *
+ * @return \Drupal\redirect\Entity\Redirect
+ */
+ public function load($redirect_id) {
+ return $this->manager->getStorage('redirect')->load($redirect_id);
+ }
+
+ /**
+ * Loads multiple redirect entities.
+ *
+ * @param array $redirect_ids
+ * Redirect ids to load.
+ *
+ * @return \Drupal\redirect\Entity\Redirect[]
+ * List of redirect entities.
+ */
+ public function loadMultiple(array $redirect_ids = NULL) {
+ return $this->manager->getStorage('redirect')->loadMultiple($redirect_ids);
+ }
+}