1 files changed, 93 insertions, 0 deletions
diff --git a/apps/files_versions/lib/Versions/VersionManager.php b/apps/files_versions/lib/Versions/VersionManager.php
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+++ b/apps/files_versions/lib/Versions/VersionManager.php
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+<?php declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2018 Robin Appelman <robin@icewind.nl>
+ *
+ * @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 OCA\Files_Versions\Versions;
+
+use OCP\Files\File;
+use OCP\Files\FileInfo;
+use OCP\Files\Storage\IStorage;
+use OCP\IUser;
+
+class VersionManager implements IVersionManager {
+	/** @var IVersionBackend[] */
+	private $backends = [];
+
+	public function registerBackend(string $storageType, IVersionBackend $backend) {
+		$this->backends[$storageType] = $backend;
+	}
+
+	/**
+	 * @return IVersionBackend[]
+	 */
+	private function getBackends(): array {
+		return $this->backends;
+	}
+
+	/**
+	 * @param IStorage $storage
+	 * @return IVersionBackend
+	 * @throws BackendNotFoundException
+	 */
+	public function getBackendForStorage(IStorage $storage): IVersionBackend {
+		$fullType = get_class($storage);
+		$backends = $this->getBackends();
+		$foundType = array_reduce(array_keys($backends), function ($type, $registeredType) use ($storage) {
+			if (
+				$storage->instanceOfStorage($registeredType) &&
+				($type === '' || is_subclass_of($registeredType, $type))
+			) {
+				return $registeredType;
+			} else {
+				return $type;
+			}
+		}, '');
+		if ($foundType === '') {
+			throw new BackendNotFoundException("Version backend for $fullType not found");
+		} else {
+			return $backends[$foundType];
+		}
+	}
+
+	public function getVersionsForFile(IUser $user, FileInfo $file): array {
+		$backend = $this->getBackendForStorage($file->getStorage());
+		return $backend->getVersionsForFile($user, $file);
+	}
+
+	public function createVersion(IUser $user, FileInfo $file) {
+		$backend = $this->getBackendForStorage($file->getStorage());
+		$backend->createVersion($user, $file);
+	}
+
+	public function rollback(IVersion $version) {
+		$backend = $version->getBackend();
+		return $backend->rollback($version);
+	}
+
+	public function read(IVersion $version) {
+		$backend = $version->getBackend();
+		return $backend->read($version);
+	}
+
+	public function getVersionFile(IUser $user, FileInfo $sourceFile, int $revision): File {
+		$backend = $this->getBackendForStorage($sourceFile->getStorage());
+		return $backend->getVersionFile($user, $sourceFile, $revision);
+	}
+}