/**
* {@inheritdoc}
*/
public function getAliasByPath($path, $langcode = NULL)
{
if ($path[0] !== '/') {
throw new \InvalidArgumentException(sprintf('Source path %s has to start with a slash.', $path));
}
// If no language is explicitly specified we default to the current URL
// language. If we used a language different from the one conveyed by the
// requested URL, we might end up being unable to check if there is a path
// alias matching the URL path.
$langcode = $langcode ?: $this->languageManager->getCurrentLanguage(LanguageInterface::TYPE_URL)->getId();
// Check the path whitelist, if the top-level part before the first /
// is not in the list, then there is no need to do anything further,
// it is not in the database.
if ($path === '/' || !$this->whitelist->get(strtok(trim($path, '/'), '/'))) {
return $path;
}
// During the first call to this method per language, load the expected
// paths for the page from cache.
if (empty($this->langcodePreloaded[$langcode])) {
$this->langcodePreloaded[$langcode] = TRUE;
$this->lookupMap[$langcode] = array();
// Load the cached paths that should be used for preloading. This only
// happens if a cache key has been set.
if ($this->preloadedPathLookups === FALSE) {
$this->preloadedPathLookups = array();
if ($this->cacheKey) {
if ($cached = $this->cache->get($this->cacheKey)) {
$this->preloadedPathLookups = $cached->data;
} else {
$this->cacheNeedsWriting = TRUE;
}
}
}
// Load paths from cache.
if (!empty($this->preloadedPathLookups[$langcode])) {
$this->lookupMap[$langcode] = $this->storage->preloadPathAlias($this->preloadedPathLookups[$langcode], $langcode);
// Keep a record of paths with no alias to avoid querying twice.
$this->noAlias[$langcode] = array_flip(array_diff_key($this->preloadedPathLookups[$langcode], array_keys($this->lookupMap[$langcode])));
}
}
// If we already know that there are no aliases for this path simply return.
if (!empty($this->noAlias[$langcode][$path])) {
return $path;
}
// If the alias has already been loaded, return it from static cache.
if (isset($this->lookupMap[$langcode][$path])) {
return $this->lookupMap[$langcode][$path];
}
// Try to load alias from storage.
if ($alias = $this->storage->lookupPathAlias($path, $langcode)) {
$this->lookupMap[$langcode][$path] = $alias;
return $alias;
}
// We can't record anything into $this->lookupMap because we didn't find any
// aliases for this path. Thus cache to $this->noAlias.
$this->noAlias[$langcode][$path] = TRUE;
return $path;
}
protected function preloadSourceItems($langcode)
{
if ($item = cache_get($this->cacheKey, 'cache_path')) {
// FIXME
$sources = $item->data;
if (!empty($sources)) {
$aliases = $this->storage->preloadPathAlias($item->data, $langcode);
// Also set to false anything that is not set.
foreach ($sources as $source) {
if (!isset($aliases[$source])) {
$aliases[$source] = false;
}
}
return $aliases;
}
}
return [];
}