Move findAvailableLanguages() to the factory

lib/private/l10n.php

@@ -452,26 +452,10 @@ class OC_L10N implements \OCP\IL10N {
 	 * find all available languages for an app
 	 * @param string $app App that needs to be translated
 	 * @return array an array of available languages
+	 * @deprecated 9.0.0 Use \OC::$server->getL10NFactory()->findAvailableLanguages() instead
 	 */
 	public static function findAvailableLanguages($app=null) {
-		// also works with null as key
-		if(isset(self::$availableLanguages[$app]) && !empty(self::$availableLanguages[$app])) {
-			return self::$availableLanguages[$app];
-		}
-		$available=array('en');//english is always available
-		$dir = self::findI18nDir($app);
-		if(is_dir($dir)) {
-			$files=scandir($dir);
-			foreach($files as $file) {
-				if(substr($file, -5, 5) === '.json' && substr($file, 0, 4) !== 'l10n') {
-					$i = substr($file, 0, -5);
-					$available[] = $i;
-				}
-			}
-		}
-
-		self::$availableLanguages[$app] = $available;
-		return $available;
+		return \OC::$server->getL10NFactory()->findAvailableLanguages($app);
 	}
 
 	/**

lib/private/l10n/factory.php

@@ -33,8 +33,11 @@ use OCP\L10N\IFactory;
 class Factory implements IFactory {
 	/**
 	 * cached instances
+	 * @var array Structure: Lang => App => \OCP\IL10N
 	 */
-	protected $instances = array();
+	protected $instances = [];
+
+	protected $availableLanguages = [];
 
 	/**
 	 * Get a language instance
@@ -56,4 +59,55 @@ class Factory implements IFactory {
 		return $this->instances[$key][$app];
 	}
 
+	/**
+	 * Find all available languages for an app
+	 *
+	 * @param string|null $app App id or null for core
+	 * @return array an array of available languages
+	 */
+	public function findAvailableLanguages($app = null) {
+		$key = $app;
+		if ($key === null) {
+			$key = 'null';
+		}
+
+		// also works with null as key
+		if (!empty($this->availableLanguages[$key])) {
+			return $this->availableLanguages[$key];
+		}
+
+		$available = ['en']; //english is always available
+		$dir = $this->findL10nDir($app);
+		if (is_dir($dir)) {
+			$files = scandir($dir);
+			if ($files !== false) {
+				foreach ($files as $file) {
+					if (substr($file, -5) === '.json' && substr($file, 0, 4) !== 'l10n') {
+						$available[] = substr($file, 0, -5);
+					}
+				}
+			}
+		}
+
+		$this->availableLanguages[$key] = $available;
+		return $available;
+	}
+
+	/**
+	 * find the l10n directory
+	 *
+	 * @param string $app App id or empty string for core
+	 * @return string directory
+	 */
+	protected function findL10nDir($app = '') {
+		if ($app !== '') {
+			// Check if the app is in the app folder
+			if (file_exists(\OC_App::getAppPath($app) . '/l10n/')) {
+				return \OC_App::getAppPath($app) . '/l10n/';
+			} else {
+				return \OC::$SERVERROOT . '/' . $app . '/l10n/';
+			}
+		}
+		return \OC::$SERVERROOT.'/core/l10n/';
+	}
 }

lib/public/l10n/ifactory.php

@@ -33,4 +33,13 @@ interface IFactory {
 	 * @since 8.2.0
 	 */
 	public function get($app, $lang = null);
+
+	/**
+	 * Find all available languages for an app
+	 *
+	 * @param string|null $app App id or null for core
+	 * @return string[] an array of available languages
+	 * @since 9.0.0
+	 */
+	public function findAvailableLanguages($app = null);
 }

settings/ajax/setlanguage.php

@@ -31,7 +31,7 @@ OCP\JSON::callCheck();
 
 // Get data
 if( isset( $_POST['lang'] ) ) {
-	$languageCodes=OC_L10N::findAvailableLanguages();
+	$languageCodes = \OC::$server->getL10NFactory()->findAvailableLanguages();
 	$lang = (string)$_POST['lang'];
 	if(array_search($lang, $languageCodes) or $lang === 'en') {
 		\OC::$server->getConfig()->setUserValue( OC_User::getUser(), 'core', 'lang', $lang );

settings/personal.php

@@ -63,7 +63,7 @@ $user = OC::$server->getUserManager()->get(OC_User::getUser());
 $email = $user->getEMailAddress();
 
 $userLang=$config->getUserValue( OC_User::getUser(), 'core', 'lang', OC_L10N::findLanguage() );
-$languageCodes=OC_L10N::findAvailableLanguages();
+$languageCodes = \OC::$server->getL10NFactory()->findAvailableLanguages();
 
 // array of common languages
 $commonLangCodes = array(