Improve translations api with detecting languages

core/Controller/TranslationApiController.php

@@ -32,8 +32,8 @@
 use OCP\IL10N;
 use OCP\IRequest;
 use OCP\PreConditionNotMetException;
+use OCP\Translation\CouldNotTranslateException;
 use OCP\Translation\ITranslationManager;
-use RuntimeException;
 
 class TranslationApiController extends \OCP\AppFramework\OCSController {
 	private ITranslationManager $translationManager;
@@ -68,15 +68,19 @@ public function languages(): DataResponse {
 	 */
 	public function translate(string $text, ?string $fromLanguage, string $toLanguage): DataResponse {
 		try {
+			$translation = $this->translationManager->translate($text, $fromLanguage, $toLanguage);
+
 			return new DataResponse([
-				'text' => $this->translationManager->translate($text, $fromLanguage, $toLanguage)
+				'text' => $translation,
+				'from' => $fromLanguage,
+
 			]);
 		} catch (PreConditionNotMetException) {
 			return new DataResponse(['message' => $this->l->t('No translation provider available')], Http::STATUS_PRECONDITION_FAILED);
 		} catch (InvalidArgumentException) {
 			return new DataResponse(['message' => $this->l->t('Could not detect language')], Http::STATUS_BAD_REQUEST);
-		} catch (RuntimeException) {
-			return new DataResponse(['message' => $this->l->t('Unable to translate')], Http::STATUS_BAD_REQUEST);
+		} catch (CouldNotTranslateException $e) {
+			return new DataResponse(['message' => $this->l->t('Unable to translate'), 'from' => $e->getFrom()], Http::STATUS_BAD_REQUEST);
 		}
 	}
 }

lib/composer/composer/autoload_classmap.php

@@ -614,6 +614,7 @@
     'OCP\\Talk\\IConversationOptions' => $baseDir . '/lib/public/Talk/IConversationOptions.php',
     'OCP\\Talk\\ITalkBackend' => $baseDir . '/lib/public/Talk/ITalkBackend.php',
     'OCP\\Template' => $baseDir . '/lib/public/Template.php',
+    'OCP\\Translation\\CouldNotTranslateException' => $baseDir . '/lib/public/Translation/CouldNotTranslateException.php',
     'OCP\\Translation\\IDetectLanguageProvider' => $baseDir . '/lib/public/Translation/IDetectLanguageProvider.php',
     'OCP\\Translation\\ITranslationManager' => $baseDir . '/lib/public/Translation/ITranslationManager.php',
     'OCP\\Translation\\ITranslationProvider' => $baseDir . '/lib/public/Translation/ITranslationProvider.php',

lib/composer/composer/autoload_static.php

@@ -647,6 +647,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OCP\\Talk\\IConversationOptions' => __DIR__ . '/../../..' . '/lib/public/Talk/IConversationOptions.php',
         'OCP\\Talk\\ITalkBackend' => __DIR__ . '/../../..' . '/lib/public/Talk/ITalkBackend.php',
         'OCP\\Template' => __DIR__ . '/../../..' . '/lib/public/Template.php',
+        'OCP\\Translation\\CouldNotTranslateException' => __DIR__ . '/../../..' . '/lib/public/Translation/CouldNotTranslateException.php',
         'OCP\\Translation\\IDetectLanguageProvider' => __DIR__ . '/../../..' . '/lib/public/Translation/IDetectLanguageProvider.php',
         'OCP\\Translation\\ITranslationManager' => __DIR__ . '/../../..' . '/lib/public/Translation/ITranslationManager.php',
         'OCP\\Translation\\ITranslationProvider' => __DIR__ . '/../../..' . '/lib/public/Translation/ITranslationProvider.php',

lib/private/Translation/TranslationManager.php

@@ -30,6 +30,7 @@
 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;
@@ -58,28 +59,36 @@ public function getLanguages(): array {
 		return $languages;
 	}
 
-	public function translate(string $text, ?string $fromLanguage, string $toLanguage): string {
+	public function translate(string $text, ?string &$fromLanguage, string $toLanguage): string {
 		if (!$this->hasProviders()) {
 			throw new PreConditionNotMetException('No translation providers available');
 		}
 
-		foreach ($this->getProviders() as $provider) {
-			if ($fromLanguage === null && $provider instanceof IDetectLanguageProvider) {
-				$fromLanguage = $provider->detectLanguage($text);
+		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');
 			}
+		}
 
+		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 RuntimeException('Could not translate text');
+		throw new CouldNotTranslateException($fromLanguage);
 	}
 
 	public function getProviders(): array {

lib/public/Translation/CouldNotTranslateException.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2023 Joas Schilling <[email protected]>
+ *
+ * @author Joas Schilling <[email protected]>
+ *
+ * @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 OCP\Translation;
+
+/**
+ * @since 27.0.0
+ */
+class CouldNotTranslateException extends \RuntimeException {
+	/**
+	 * @since 27.0.0
+	 */
+	public function __construct(
+		protected ?string $from,
+	) {
+		parent::__construct();
+	}
+
+	/**
+	 * @since 27.0.0
+	 */
+	public function getFrom(): ?string {
+		return $this->from;
+	}
+}

lib/public/Translation/ITranslationManager.php

@@ -28,7 +28,6 @@
 
 use InvalidArgumentException;
 use OCP\PreConditionNotMetException;
-use RuntimeException;
 
 /**
  * @since 26.0.0
@@ -54,7 +53,7 @@ public function getLanguages(): array;
 	 * @since 26.0.0
 	 * @throws PreConditionNotMetException If no provider was registered but this method was still called
 	 * @throws InvalidArgumentException If no matching provider was found that can detect a language
-	 * @throws RuntimeException If the translation failed for other reasons
+	 * @throws CouldNotTranslateException If the translation failed for other reasons
 	 */
-	public function translate(string $text, ?string $fromLanguage, string $toLanguage): string;
+	public function translate(string $text, ?string &$fromLanguage, string $toLanguage): string;
 }