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@@ -0,0 +1,120 @@
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+<?php
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+
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+declare(strict_types=1);
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+
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+/**
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+ * @copyright Copyright (c) 2023 Julius Härtl <jus@bitgrid.net>
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+ *
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+ * @author Julius Härtl <jus@bitgrid.net>
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+ *
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+ * @license GNU AGPL version 3 or any later version
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU Affero General Public License as
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+ * published by the Free Software Foundation, either version 3 of the
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+ * License, or (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU Affero General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU Affero General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+
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+namespace OC\Translation;
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+
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+use InvalidArgumentException;
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+use OC\AppFramework\Bootstrap\Coordinator;
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+use OCP\IServerContainer;
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+use OCP\PreConditionNotMetException;
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+use OCP\Translation\IDetectLanguageProvider;
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+use OCP\Translation\ITranslationManager;
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+use OCP\Translation\ITranslationProvider;
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+use Psr\Container\ContainerExceptionInterface;
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+use Psr\Container\NotFoundExceptionInterface;
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+use Psr\Log\LoggerInterface;
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+use RuntimeException;
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+use Throwable;
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+
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+class TranslationManager implements ITranslationManager {
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+ /** @var ?ITranslationProvider[] */
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+ private ?array $providers = null;
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+
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+ public function __construct(
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+ private IServerContainer $serverContainer,
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+ private Coordinator $coordinator,
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+ private LoggerInterface $logger,
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+ ) {
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+ }
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+
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+ public function getLanguages(): array {
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+ $languages = [];
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+ foreach ($this->getProviders() as $provider) {
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+ $languages = array_merge($languages, $provider->getAvailableLanguages());
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+ }
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+ return $languages;
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+ }
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+
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+ public function translate(string $text, ?string $fromLanguage, string $toLanguage): string {
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+ if (!$this->hasProviders()) {
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+ throw new PreConditionNotMetException('No translation providers available');
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+ }
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+
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+ foreach ($this->getProviders() as $provider) {
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+ if ($fromLanguage === null && $provider instanceof IDetectLanguageProvider) {
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+ $fromLanguage = $provider->detectLanguage($text);
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+ }
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+
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+ if ($fromLanguage === null) {
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+ throw new InvalidArgumentException('Could not detect language');
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+ }
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+
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+ try {
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+ return $provider->translate($fromLanguage, $toLanguage, $text);
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+ } catch (RuntimeException $e) {
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+ $this->logger->warning("Failed to translate from {$fromLanguage} to {$toLanguage}", ['exception' => $e]);
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+ }
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+ }
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+
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+ throw new RuntimeException('Could not translate text');
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+ }
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+
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+ public function getProviders(): array {
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+ $context = $this->coordinator->getRegistrationContext();
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+
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+ if ($this->providers !== null) {
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+ return $this->providers;
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+ }
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+
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+ $this->providers = [];
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+ foreach ($context->getTranslationProviders() as $providerRegistration) {
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+ $class = $providerRegistration->getService();
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+ try {
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+ $this->providers[$class] = $this->serverContainer->get($class);
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+ } catch (NotFoundExceptionInterface|ContainerExceptionInterface|Throwable $e) {
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+ $this->logger->error('Failed to load translation provider ' . $class, [
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+ 'exception' => $e
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+ ]);
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+ }
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+ }
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+
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+ return $this->providers;
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+ }
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+
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+ public function hasProviders(): bool {
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+ $context = $this->coordinator->getRegistrationContext();
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+ return !empty($context->getTranslationProviders());
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+ }
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+
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+ public function canDetectLanguage(): bool {
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+ foreach ($this->getProviders() as $provider) {
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+ if ($provider instanceof IDetectLanguageProvider) {
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+ return true;
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+ }
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+ }
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+ return false;
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+ }
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+}
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