nextcloud/lib/private/L10N/Factory.php

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<?php
/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
* @copyright 2016 Roeland Jago Douma <roeland@famdouma.nl>
* @copyright 2016 Lukas Reschke <lukas@statuscode.ch>
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*
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* @author Bart Visscher <bartv@thisnet.nl>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Robin McCorkell <robin@mccorkell.me.uk>
* @author Roeland Jago Douma <roeland@famdouma.nl>
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*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
*/
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namespace OC\L10N;
use OCP\IConfig;
use OCP\IRequest;
use OCP\IUserSession;
use OCP\L10N\IFactory;
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/**
* A factory that generates language instances
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*/
class Factory implements IFactory {
/** @var string */
protected $requestLanguage = '';
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/**
* cached instances
* @var array Structure: Lang => App => \OCP\IL10N
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*/
protected $instances = [];
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/**
* @var array Structure: App => string[]
*/
protected $availableLanguages = [];
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/**
* @var array Structure: string => callable
*/
protected $pluralFunctions = [];
/** @var IConfig */
protected $config;
/** @var IRequest */
protected $request;
/** @var IUserSession */
protected $userSession;
/** @var string */
protected $serverRoot;
/**
* @param IConfig $config
* @param IRequest $request
* @param IUserSession $userSession
* @param string $serverRoot
*/
public function __construct(IConfig $config,
IRequest $request,
IUserSession $userSession,
$serverRoot) {
$this->config = $config;
$this->request = $request;
$this->userSession = $userSession;
$this->serverRoot = $serverRoot;
}
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/**
* Get a language instance
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*
* @param string $app
* @param string|null $lang
* @return \OCP\IL10N
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*/
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public function get($app, $lang = null) {
$app = \OC_App::cleanAppId($app);
if ($lang !== null) {
$lang = str_replace(array('\0', '/', '\\', '..'), '', (string) $lang);
}
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if ($lang === null || !$this->languageExists($app, $lang)) {
$lang = $this->findLanguage($app);
}
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if (!isset($this->instances[$lang][$app])) {
$this->instances[$lang][$app] = new L10N(
$this, $app, $lang,
$this->getL10nFilesForApp($app, $lang)
);
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}
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return $this->instances[$lang][$app];
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}
/**
* Find the best language
*
* @param string|null $app App id or null for core
* @return string language If nothing works it returns 'en'
*/
public function findLanguage($app = null) {
if ($this->requestLanguage !== '' && $this->languageExists($app, $this->requestLanguage)) {
return $this->requestLanguage;
}
/**
* At this point ownCloud might not yet be installed and thus the lookup
* in the preferences table might fail. For this reason we need to check
* whether the instance has already been installed
*
* @link https://github.com/owncloud/core/issues/21955
*/
if($this->config->getSystemValue('installed', false)) {
$userId = !is_null($this->userSession->getUser()) ? $this->userSession->getUser()->getUID() : null;
if(!is_null($userId)) {
$userLang = $this->config->getUserValue($userId, 'core', 'lang', null);
} else {
$userLang = null;
}
} else {
$userId = null;
$userLang = null;
}
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if ($userLang) {
$this->requestLanguage = $userLang;
if ($this->languageExists($app, $userLang)) {
return $userLang;
}
}
try {
// Try to get the language from the Request
$lang = $this->getLanguageFromRequest($app);
if ($userId !== null && $app === null && !$userLang) {
$this->config->setUserValue($userId, 'core', 'lang', $lang);
}
return $lang;
} catch (LanguageNotFoundException $e) {
// Finding language from request failed fall back to default language
$defaultLanguage = $this->config->getSystemValue('default_language', false);
if ($defaultLanguage !== false && $this->languageExists($app, $defaultLanguage)) {
return $defaultLanguage;
}
}
// We could not find any language so fall back to english
return 'en';
}
/**
* 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);
}
}
}
}
// merge with translations from theme
$theme = $this->config->getSystemValue('theme');
if (!empty($theme)) {
$themeDir = $this->serverRoot . '/themes/' . $theme . substr($dir, strlen($this->serverRoot));
if (is_dir($themeDir)) {
$files = scandir($themeDir);
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;
}
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/**
* @param string|null $app App id or null for core
* @param string $lang
* @return bool
*/
public function languageExists($app, $lang) {
if ($lang === 'en') {//english is always available
return true;
}
$languages = $this->findAvailableLanguages($app);
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return array_search($lang, $languages) !== false;
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}
/**
* @param string|null $app
* @return string
* @throws LanguageNotFoundException
*/
private function getLanguageFromRequest($app) {
$header = $this->request->getHeader('ACCEPT_LANGUAGE');
if ($header) {
$available = $this->findAvailableLanguages($app);
// E.g. make sure that 'de' is before 'de_DE'.
sort($available);
$preferences = preg_split('/,\s*/', strtolower($header));
foreach ($preferences as $preference) {
list($preferred_language) = explode(';', $preference);
$preferred_language = str_replace('-', '_', $preferred_language);
foreach ($available as $available_language) {
if ($preferred_language === strtolower($available_language)) {
return $available_language;
}
}
// Fallback from de_De to de
foreach ($available as $available_language) {
if (substr($preferred_language, 0, 2) === $available_language) {
return $available_language;
}
}
}
}
throw new LanguageNotFoundException();
}
/**
* Checks if $sub is a subdirectory of $parent
*
* @param string $sub
* @param string $parent
* @return bool
*/
private function isSubDirectory($sub, $parent) {
// Check whether $sub contains no ".."
if(strpos($sub, '..') !== false) {
return false;
}
// Check whether $sub is a subdirectory of $parent
if (strpos($sub, $parent) === 0) {
return true;
}
return false;
}
/**
* Get a list of language files that should be loaded
*
* @param string $app
* @param string $lang
* @return string[]
*/
// FIXME This method is only public, until OC_L10N does not need it anymore,
// FIXME This is also the reason, why it is not in the public interface
public function getL10nFilesForApp($app, $lang) {
$languageFiles = [];
$i18nDir = $this->findL10nDir($app);
$transFile = strip_tags($i18nDir) . strip_tags($lang) . '.json';
if (($this->isSubDirectory($transFile, $this->serverRoot . '/core/l10n/')
|| $this->isSubDirectory($transFile, $this->serverRoot . '/lib/l10n/')
|| $this->isSubDirectory($transFile, $this->serverRoot . '/settings/l10n/')
|| $this->isSubDirectory($transFile, \OC_App::getAppPath($app) . '/l10n/')
)
&& file_exists($transFile)) {
// load the translations file
$languageFiles[] = $transFile;
}
// merge with translations from theme
$theme = $this->config->getSystemValue('theme');
if (!empty($theme)) {
$transFile = $this->serverRoot . '/themes/' . $theme . substr($transFile, strlen($this->serverRoot));
if (file_exists($transFile)) {
$languageFiles[] = $transFile;
}
}
return $languageFiles;
}
/**
* find the l10n directory
*
* @param string $app App id or empty string for core
* @return string directory
*/
protected function findL10nDir($app = null) {
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if (in_array($app, ['core', 'lib', 'settings'])) {
if (file_exists($this->serverRoot . '/' . $app . '/l10n/')) {
return $this->serverRoot . '/' . $app . '/l10n/';
}
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} else if ($app && \OC_App::getAppPath($app) !== false) {
// Check if the app is in the app folder
return \OC_App::getAppPath($app) . '/l10n/';
}
return $this->serverRoot . '/core/l10n/';
}
/**
* Creates a function from the plural string
*
* Parts of the code is copied from Habari:
* https://github.com/habari/system/blob/master/classes/locale.php
* @param string $string
* @return string
*/
public function createPluralFunction($string) {
if (isset($this->pluralFunctions[$string])) {
return $this->pluralFunctions[$string];
}
if (preg_match( '/^\s*nplurals\s*=\s*(\d+)\s*;\s*plural=(.*)$/u', $string, $matches)) {
// sanitize
$nplurals = preg_replace( '/[^0-9]/', '', $matches[1] );
$plural = preg_replace( '#[^n0-9:\(\)\?\|\&=!<>+*/\%-]#', '', $matches[2] );
$body = str_replace(
array( 'plural', 'n', '$n$plurals', ),
array( '$plural', '$n', '$nplurals', ),
'nplurals='. $nplurals . '; plural=' . $plural
);
// add parents
// important since PHP's ternary evaluates from left to right
$body .= ';';
$res = '';
$p = 0;
for($i = 0; $i < strlen($body); $i++) {
$ch = $body[$i];
switch ( $ch ) {
case '?':
$res .= ' ? (';
$p++;
break;
case ':':
$res .= ') : (';
break;
case ';':
$res .= str_repeat( ')', $p ) . ';';
$p = 0;
break;
default:
$res .= $ch;
}
}
$body = $res . 'return ($plural>=$nplurals?$nplurals-1:$plural);';
$function = create_function('$n', $body);
$this->pluralFunctions[$string] = $function;
return $function;
} else {
// default: one plural form for all cases but n==1 (english)
$function = create_function(
'$n',
'$nplurals=2;$plural=($n==1?0:1);return ($plural>=$nplurals?$nplurals-1:$plural);'
);
$this->pluralFunctions[$string] = $function;
return $function;
}
}
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}