1 files changed, 89 insertions, 0 deletions
diff --git a/apps/files_versions/lib/Versions/IVersionBackend.php b/apps/files_versions/lib/Versions/IVersionBackend.php
new file mode 100644
index 00000000000..18f8c17f0ac
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+++ b/apps/files_versions/lib/Versions/IVersionBackend.php
@@ -0,0 +1,89 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\Files_Versions\Versions;
+
+use OC\Files\Node\Node;
+use OCP\Files\File;
+use OCP\Files\FileInfo;
+use OCP\Files\NotFoundException;
+use OCP\Files\Storage\IStorage;
+use OCP\IUser;
+
+/**
+ * @since 15.0.0
+ */
+interface IVersionBackend {
+	/**
+	 * Whether or not this version backend should be used for a storage
+	 *
+	 * If false is returned then the next applicable backend will be used
+	 *
+	 * @param IStorage $storage
+	 * @return bool
+	 * @since 17.0.0
+	 */
+	public function useBackendForStorage(IStorage $storage): bool;
+
+	/**
+	 * Get all versions for a file
+	 *
+	 * @param IUser $user
+	 * @param FileInfo $file
+	 * @return IVersion[]
+	 * @since 15.0.0
+	 */
+	public function getVersionsForFile(IUser $user, FileInfo $file): array;
+
+	/**
+	 * Create a new version for a file
+	 *
+	 * @param IUser $user
+	 * @param FileInfo $file
+	 * @since 15.0.0
+	 */
+	public function createVersion(IUser $user, FileInfo $file);
+
+	/**
+	 * Restore this version
+	 *
+	 * @param IVersion $version
+	 * @since 15.0.0
+	 */
+	public function rollback(IVersion $version);
+
+	/**
+	 * Open the file for reading
+	 *
+	 * @param IVersion $version
+	 * @return resource|false
+	 * @throws NotFoundException
+	 * @since 15.0.0
+	 */
+	public function read(IVersion $version);
+
+	/**
+	 * Get the preview for a specific version of a file
+	 *
+	 * @param IUser $user
+	 * @param FileInfo $sourceFile
+	 * @param int|string $revision
+	 *
+	 * @return File
+	 *
+	 * @since 15.0.0
+	 */
+	public function getVersionFile(IUser $user, FileInfo $sourceFile, $revision): File;
+
+	/**
+	 * Get the revision for a node
+	 *
+	 * @since 32.0.0
+	 */
+	public function getRevision(Node $node): int;
+}