1 files changed, 237 insertions, 0 deletions
diff --git a/core/Controller/TextToImageApiController.php b/core/Controller/TextToImageApiController.php
new file mode 100644
index 00000000000..d2c3e1ec288
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+++ b/core/Controller/TextToImageApiController.php
@@ -0,0 +1,237 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+
+namespace OC\Core\Controller;
+
+use OC\Core\ResponseDefinitions;
+use OC\Files\AppData\AppData;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\Attribute\AnonRateLimit;
+use OCP\AppFramework\Http\Attribute\ApiRoute;
+use OCP\AppFramework\Http\Attribute\BruteForceProtection;
+use OCP\AppFramework\Http\Attribute\NoAdminRequired;
+use OCP\AppFramework\Http\Attribute\PublicPage;
+use OCP\AppFramework\Http\Attribute\UserRateLimit;
+use OCP\AppFramework\Http\DataResponse;
+use OCP\AppFramework\Http\FileDisplayResponse;
+use OCP\AppFramework\OCSController;
+use OCP\DB\Exception;
+use OCP\Files\NotFoundException;
+use OCP\IL10N;
+use OCP\IRequest;
+use OCP\PreConditionNotMetException;
+use OCP\TextToImage\Exception\TaskFailureException;
+use OCP\TextToImage\Exception\TaskNotFoundException;
+use OCP\TextToImage\IManager;
+use OCP\TextToImage\Task;
+
+/**
+ * @psalm-import-type CoreTextToImageTask from ResponseDefinitions
+ */
+class TextToImageApiController extends OCSController {
+	public function __construct(
+		string $appName,
+		IRequest $request,
+		private IManager $textToImageManager,
+		private IL10N $l,
+		private ?string $userId,
+		private AppData $appData,
+	) {
+		parent::__construct($appName, $request);
+	}
+
+	/**
+	 * Check whether this feature is available
+	 *
+	 * @return DataResponse<Http::STATUS_OK, array{isAvailable: bool}, array{}>
+	 *
+	 * 200: Returns availability status
+	 */
+	#[PublicPage]
+	#[ApiRoute(verb: 'GET', url: '/is_available', root: '/text2image')]
+	public function isAvailable(): DataResponse {
+		return new DataResponse([
+			'isAvailable' => $this->textToImageManager->hasProviders(),
+		]);
+	}
+
+	/**
+	 * This endpoint allows scheduling a text to image task
+	 *
+	 * @param string $input Input text
+	 * @param string $appId ID of the app that will execute the task
+	 * @param string $identifier An arbitrary identifier for the task
+	 * @param int $numberOfImages The number of images to generate
+	 *
+	 * @return DataResponse<Http::STATUS_OK, array{task: CoreTextToImageTask}, array{}>|DataResponse<Http::STATUS_PRECONDITION_FAILED|Http::STATUS_INTERNAL_SERVER_ERROR, array{message: string}, array{}>
+	 *
+	 * 200: Task scheduled successfully
+	 * 412: Scheduling task is not possible
+	 */
+	#[PublicPage]
+	#[UserRateLimit(limit: 20, period: 120)]
+	#[AnonRateLimit(limit: 5, period: 120)]
+	#[ApiRoute(verb: 'POST', url: '/schedule', root: '/text2image')]
+	public function schedule(string $input, string $appId, string $identifier = '', int $numberOfImages = 8): DataResponse {
+		$task = new Task($input, $appId, $numberOfImages, $this->userId, $identifier);
+		try {
+			try {
+				$this->textToImageManager->runOrScheduleTask($task);
+			} catch (TaskFailureException) {
+				// Task status was already updated by the manager, nothing to do here
+			}
+
+			$json = $task->jsonSerialize();
+
+			return new DataResponse([
+				'task' => $json,
+			]);
+		} catch (PreConditionNotMetException) {
+			return new DataResponse(['message' => $this->l->t('No text to image provider is available')], Http::STATUS_PRECONDITION_FAILED);
+		} catch (Exception) {
+			return new DataResponse(['message' => $this->l->t('Internal error')], Http::STATUS_INTERNAL_SERVER_ERROR);
+		}
+	}
+
+	/**
+	 * This endpoint allows checking the status and results of a task.
+	 * Tasks are removed 1 week after receiving their last update.
+	 *
+	 * @param int $id The id of the task
+	 *
+	 * @return DataResponse<Http::STATUS_OK, array{task: CoreTextToImageTask}, array{}>|DataResponse<Http::STATUS_NOT_FOUND|Http::STATUS_INTERNAL_SERVER_ERROR, array{message: string}, array{}>
+	 *
+	 * 200: Task returned
+	 * 404: Task not found
+	 */
+	#[PublicPage]
+	#[BruteForceProtection(action: 'text2image')]
+	#[ApiRoute(verb: 'GET', url: '/task/{id}', root: '/text2image')]
+	public function getTask(int $id): DataResponse {
+		try {
+			$task = $this->textToImageManager->getUserTask($id, $this->userId);
+
+			$json = $task->jsonSerialize();
+
+			return new DataResponse([
+				'task' => $json,
+			]);
+		} catch (TaskNotFoundException) {
+			$res = new DataResponse(['message' => $this->l->t('Task not found')], Http::STATUS_NOT_FOUND);
+			$res->throttle(['action' => 'text2image']);
+			return $res;
+		} catch (\RuntimeException) {
+			return new DataResponse(['message' => $this->l->t('Internal error')], Http::STATUS_INTERNAL_SERVER_ERROR);
+		}
+	}
+
+	/**
+	 * This endpoint allows downloading the resulting image of a task
+	 *
+	 * @param int $id The id of the task
+	 * @param int $index The index of the image to retrieve
+	 *
+	 * @return FileDisplayResponse<Http::STATUS_OK, array{'Content-Type': string}>|DataResponse<Http::STATUS_NOT_FOUND|Http::STATUS_INTERNAL_SERVER_ERROR, array{message: string}, array{}>
+	 *
+	 * 200: Image returned
+	 * 404: Task or image not found
+	 */
+	#[PublicPage]
+	#[BruteForceProtection(action: 'text2image')]
+	#[ApiRoute(verb: 'GET', url: '/task/{id}/image/{index}', root: '/text2image')]
+	public function getImage(int $id, int $index): DataResponse|FileDisplayResponse {
+		try {
+			$task = $this->textToImageManager->getUserTask($id, $this->userId);
+			try {
+				$folder = $this->appData->getFolder('text2image');
+			} catch (NotFoundException) {
+				$res = new DataResponse(['message' => $this->l->t('Image not found')], Http::STATUS_NOT_FOUND);
+				$res->throttle(['action' => 'text2image']);
+				return $res;
+			}
+			$file = $folder->getFolder((string)$task->getId())->getFile((string)$index);
+			$info = getimagesizefromstring($file->getContent());
+
+			return new FileDisplayResponse($file, Http::STATUS_OK, ['Content-Type' => image_type_to_mime_type($info[2])]);
+		} catch (TaskNotFoundException) {
+			$res = new DataResponse(['message' => $this->l->t('Task not found')], Http::STATUS_NOT_FOUND);
+			$res->throttle(['action' => 'text2image']);
+			return $res;
+		} catch (\RuntimeException) {
+			return new DataResponse(['message' => $this->l->t('Internal error')], Http::STATUS_INTERNAL_SERVER_ERROR);
+		} catch (NotFoundException) {
+			$res = new DataResponse(['message' => $this->l->t('Image not found')], Http::STATUS_NOT_FOUND);
+			$res->throttle(['action' => 'text2image']);
+			return $res;
+		}
+	}
+
+	/**
+	 * This endpoint allows to delete a scheduled task for a user
+	 *
+	 * @param int $id The id of the task
+	 *
+	 * @return DataResponse<Http::STATUS_OK, array{task: CoreTextToImageTask}, array{}>|DataResponse<Http::STATUS_NOT_FOUND|Http::STATUS_INTERNAL_SERVER_ERROR, array{message: string}, array{}>
+	 *
+	 * 200: Task returned
+	 * 404: Task not found
+	 */
+	#[NoAdminRequired]
+	#[BruteForceProtection(action: 'text2image')]
+	#[ApiRoute(verb: 'DELETE', url: '/task/{id}', root: '/text2image')]
+	public function deleteTask(int $id): DataResponse {
+		try {
+			$task = $this->textToImageManager->getUserTask($id, $this->userId);
+
+			$this->textToImageManager->deleteTask($task);
+
+			$json = $task->jsonSerialize();
+
+			return new DataResponse([
+				'task' => $json,
+			]);
+		} catch (TaskNotFoundException) {
+			$res = new DataResponse(['message' => $this->l->t('Task not found')], Http::STATUS_NOT_FOUND);
+			$res->throttle(['action' => 'text2image']);
+			return $res;
+		} catch (\RuntimeException) {
+			return new DataResponse(['message' => $this->l->t('Internal error')], Http::STATUS_INTERNAL_SERVER_ERROR);
+		}
+	}
+
+
+	/**
+	 * This endpoint returns a list of tasks of a user that are related
+	 * with a specific appId and optionally with an identifier
+	 *
+	 * @param string $appId ID of the app
+	 * @param string|null $identifier An arbitrary identifier for the task
+	 * @return DataResponse<Http::STATUS_OK, array{tasks: list<CoreTextToImageTask>}, array{}>|DataResponse<Http::STATUS_INTERNAL_SERVER_ERROR, array{message: string}, array{}>
+	 *
+	 * 200: Task list returned
+	 */
+	#[NoAdminRequired]
+	#[AnonRateLimit(limit: 5, period: 120)]
+	#[ApiRoute(verb: 'GET', url: '/tasks/app/{appId}', root: '/text2image')]
+	public function listTasksByApp(string $appId, ?string $identifier = null): DataResponse {
+		try {
+			$tasks = $this->textToImageManager->getUserTasksByApp($this->userId, $appId, $identifier);
+			$json = array_values(array_map(static function (Task $task) {
+				return $task->jsonSerialize();
+			}, $tasks));
+
+			return new DataResponse([
+				'tasks' => $json,
+			]);
+		} catch (\RuntimeException) {
+			return new DataResponse(['message' => $this->l->t('Internal error')], Http::STATUS_INTERNAL_SERVER_ERROR);
+		}
+	}
+}