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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2023 Julius Härtl <jus@bitgrid.net>
*
* @author Julius Härtl <jus@bitgrid.net>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace OC\Translation;
use InvalidArgumentException;
use OC\AppFramework\Bootstrap\Coordinator;
use OCP\IServerContainer;
use OCP\PreConditionNotMetException;
use OCP\Translation\CouldNotTranslateException;
use OCP\Translation\IDetectLanguageProvider;
use OCP\Translation\ITranslationManager;
use OCP\Translation\ITranslationProvider;
use Psr\Container\ContainerExceptionInterface;
use Psr\Container\NotFoundExceptionInterface;
use Psr\Log\LoggerInterface;
use RuntimeException;
use Throwable;
class TranslationManager implements ITranslationManager {
/** @var ?ITranslationProvider[] */
private ?array $providers = null;
public function __construct(
private IServerContainer $serverContainer,
private Coordinator $coordinator,
private LoggerInterface $logger,
) {
}
public function getLanguages(): array {
$languages = [];
foreach ($this->getProviders() as $provider) {
$languages = array_merge($languages, $provider->getAvailableLanguages());
}
return $languages;
}
public function translate(string $text, ?string &$fromLanguage, string $toLanguage): string {
if (!$this->hasProviders()) {
throw new PreConditionNotMetException('No translation providers available');
}
if ($fromLanguage === null) {
foreach ($this->getProviders() as $provider) {
if ($provider instanceof IDetectLanguageProvider) {
$fromLanguage = $provider->detectLanguage($text);
}
if ($fromLanguage !== null) {
break;
}
}
if ($fromLanguage === null) {
throw new InvalidArgumentException('Could not detect language');
}
}
if ($fromLanguage === $toLanguage) {
return $text;
}
foreach ($this->getProviders() as $provider) {
try {
return $provider->translate($fromLanguage, $toLanguage, $text);
} catch (RuntimeException $e) {
$this->logger->warning("Failed to translate from {$fromLanguage} to {$toLanguage}", ['exception' => $e]);
}
}
throw new CouldNotTranslateException($fromLanguage);
}
public function getProviders(): array {
$context = $this->coordinator->getRegistrationContext();
if ($this->providers !== null) {
return $this->providers;
}
$this->providers = [];
foreach ($context->getTranslationProviders() as $providerRegistration) {
$class = $providerRegistration->getService();
try {
$this->providers[$class] = $this->serverContainer->get($class);
} catch (NotFoundExceptionInterface|ContainerExceptionInterface|Throwable $e) {
$this->logger->error('Failed to load translation provider ' . $class, [
'exception' => $e
]);
}
}
return $this->providers;
}
public function hasProviders(): bool {
$context = $this->coordinator->getRegistrationContext();
return !empty($context->getTranslationProviders());
}
public function canDetectLanguage(): bool {
foreach ($this->getProviders() as $provider) {
if ($provider instanceof IDetectLanguageProvider) {
return true;
}
}
return false;
}
}
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