7 files changed, 553 insertions, 0 deletions
diff --git a/apps/files_versions/lib/Versions/BackendNotFoundException.php b/apps/files_versions/lib/Versions/BackendNotFoundException.php
new file mode 100644
index 00000000000..09985a716b9
--- /dev/null
+++ b/apps/files_versions/lib/Versions/BackendNotFoundException.php
@@ -0,0 +1,26 @@
+<?php
+/**
+ * @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;
+
+class BackendNotFoundException extends \Exception {
+
+}
diff --git a/apps/files_versions/lib/Versions/IVersion.php b/apps/files_versions/lib/Versions/IVersion.php
new file mode 100644
index 00000000000..b6fc95814d8
--- /dev/null
+++ b/apps/files_versions/lib/Versions/IVersion.php
@@ -0,0 +1,99 @@
+<?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\FileInfo;
+use OCP\IUser;
+
+/**
+ * @since 15.0.0
+ */
+interface IVersion {
+	/**
+	 * @return IVersionBackend
+	 * @since 15.0.0
+	 */
+	public function getBackend(): IVersionBackend;
+
+	/**
+	 * Get the file info of the source file
+	 *
+	 * @return FileInfo
+	 * @since 15.0.0
+	 */
+	public function getSourceFile(): FileInfo;
+
+	/**
+	 * Get the id of the revision for the file
+	 *
+	 * @return int
+	 * @since 15.0.0
+	 */
+	public function getRevisionId(): int;
+
+	/**
+	 * Get the timestamp this version was created
+	 *
+	 * @return int
+	 * @since 15.0.0
+	 */
+	public function getTimestamp(): int;
+
+	/**
+	 * Get the size of this version
+	 *
+	 * @return int
+	 * @since 15.0.0
+	 */
+	public function getSize(): int;
+
+	/**
+	 * Get the name of the source file at the time of making this version
+	 *
+	 * @return string
+	 * @since 15.0.0
+	 */
+	public function getSourceFileName(): string;
+
+	/**
+	 * Get the mimetype of this version
+	 *
+	 * @return string
+	 * @since 15.0.0
+	 */
+	public function getMimeType(): string;
+
+	/**
+	 * Get the path of this version
+	 *
+	 * @return string
+	 * @since 15.0.0
+	 */
+	public function getVersionPath(): string;
+
+	/**
+	 * @return IUser
+	 * @since 15.0.0
+	 */
+	public function getUser(): IUser;
+}
diff --git a/apps/files_versions/lib/Versions/IVersionBackend.php b/apps/files_versions/lib/Versions/IVersionBackend.php
new file mode 100644
index 00000000000..616d535f7fd
--- /dev/null
+++ b/apps/files_versions/lib/Versions/IVersionBackend.php
@@ -0,0 +1,81 @@
+<?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\NotFoundException;
+use OCP\Files\SimpleFS\ISimpleFile;
+use OCP\IUser;
+
+/**
+ * @since 15.0.0
+ */
+interface IVersionBackend {
+	/**
+	 * 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
+	 * @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 $revision
+	 * @return ISimpleFile
+	 * @since 15.0.0
+	 */
+	public function getVersionFile(IUser $user, FileInfo $sourceFile, int $revision): File;
+}
diff --git a/apps/files_versions/lib/Versions/IVersionManager.php b/apps/files_versions/lib/Versions/IVersionManager.php
new file mode 100644
index 00000000000..748b649b1a2
--- /dev/null
+++ b/apps/files_versions/lib/Versions/IVersionManager.php
@@ -0,0 +1,36 @@
+<?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;
+
+/**
+ * @since 15.0.0
+ */
+interface IVersionManager extends IVersionBackend {
+	/**
+	 * Register a new backend
+	 *
+	 * @param string $storageType
+	 * @param IVersionBackend $backend
+	 * @since 15.0.0
+	 */
+	public function registerBackend(string $storageType, IVersionBackend $backend);
+}
diff --git a/apps/files_versions/lib/Versions/LegacyVersionsBackend.php b/apps/files_versions/lib/Versions/LegacyVersionsBackend.php
new file mode 100644
index 00000000000..7293aca641e
--- /dev/null
+++ b/apps/files_versions/lib/Versions/LegacyVersionsBackend.php
@@ -0,0 +1,105 @@
+<?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 OC\Files\View;
+use OCA\Files_Versions\Storage;
+use OCP\Files\File;
+use OCP\Files\FileInfo;
+use OCP\Files\Folder;
+use OCP\Files\IRootFolder;
+use OCP\Files\NotFoundException;
+use OCP\IUser;
+
+class LegacyVersionsBackend implements IVersionBackend {
+	/** @var IRootFolder */
+	private $rootFolder;
+
+	public function __construct(IRootFolder $rootFolder) {
+		$this->rootFolder = $rootFolder;
+	}
+
+	public function getVersionsForFile(IUser $user, FileInfo $file): array {
+		$userFolder = $this->rootFolder->getUserFolder($user->getUID());
+		$versions = Storage::getVersions($user->getUID(), $userFolder->getRelativePath($file->getPath()));
+
+		return array_map(function (array $data) use ($file, $user) {
+			return new Version(
+				(int)$data['version'],
+				(int)$data['version'],
+				$data['name'],
+				(int)$data['size'],
+				$data['mimetype'],
+				$data['path'],
+				$file,
+				$this,
+				$user
+			);
+		}, $versions);
+	}
+
+	public function createVersion(IUser $user, FileInfo $file) {
+		$userFolder = $this->rootFolder->getUserFolder($user->getUID());
+		$relativePath = $userFolder->getRelativePath($file->getPath());
+		$userView = new View('/' . $user->getUID());
+		// create all parent folders
+		Storage::createMissingDirectories($relativePath, $userView);
+
+		Storage::scheduleExpire($user->getUID(), $relativePath);
+
+		// store a new version of a file
+		$userView->copy('files/' . $relativePath, 'files_versions/' . $relativePath . '.v' . $file->getMtime());
+		// ensure the file is scanned
+		$userView->getFileInfo('files_versions/' . $relativePath . '.v' . $file->getMtime());
+	}
+
+	public function rollback(IVersion $version) {
+		return Storage::rollback($version->getVersionPath(), $version->getRevisionId());
+	}
+
+	private function getVersionFolder(IUser $user): Folder {
+		$userRoot = $this->rootFolder->getUserFolder($user->getUID())
+			->getParent();
+		try {
+			/** @var Folder $folder */
+			$folder = $userRoot->get('files_versions');
+			return $folder;
+		} catch (NotFoundException $e) {
+			return $userRoot->newFolder('files_versions');
+		}
+	}
+
+	public function read(IVersion $version) {
+		$versions = $this->getVersionFolder($version->getUser());
+		/** @var File $file */
+		$file = $versions->get($version->getVersionPath() . '.v' . $version->getRevisionId());
+		return $file->fopen('r');
+	}
+
+	public function getVersionFile(IUser $user, FileInfo $sourceFile, int $revision): File {
+		$userFolder = $this->rootFolder->getUserFolder($user->getUID());
+		$versionFolder = $this->getVersionFolder($user);
+		/** @var File $file */
+		$file = $versionFolder->get($userFolder->getRelativePath($sourceFile->getPath()) . '.v' . $revision);
+		return $file;
+	}
+}
diff --git a/apps/files_versions/lib/Versions/Version.php b/apps/files_versions/lib/Versions/Version.php
new file mode 100644
index 00000000000..5988234db61
--- /dev/null
+++ b/apps/files_versions/lib/Versions/Version.php
@@ -0,0 +1,113 @@
+<?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\FileInfo;
+use OCP\IUser;
+
+class Version implements IVersion {
+	/** @var int */
+	private $timestamp;
+
+	/** @var int */
+	private $revisionId;
+
+	/** @var string */
+	private $name;
+
+	/** @var int */
+	private $size;
+
+	/** @var string */
+	private $mimetype;
+
+	/** @var string */
+	private $path;
+
+	/** @var FileInfo */
+	private $sourceFileInfo;
+
+	/** @var IVersionBackend */
+	private $backend;
+
+	/** @var IUser */
+	private $user;
+
+	public function __construct(
+		int $timestamp,
+		int $revisionId,
+		string $name,
+		int $size,
+		string $mimetype,
+		string $path,
+		FileInfo $sourceFileInfo,
+		IVersionBackend $backend,
+		IUser $user
+	) {
+		$this->timestamp = $timestamp;
+		$this->revisionId = $revisionId;
+		$this->name = $name;
+		$this->size = $size;
+		$this->mimetype = $mimetype;
+		$this->path = $path;
+		$this->sourceFileInfo = $sourceFileInfo;
+		$this->backend = $backend;
+		$this->user = $user;
+	}
+
+	public function getBackend(): IVersionBackend {
+		return $this->backend;
+	}
+
+	public function getSourceFile(): FileInfo {
+		return $this->sourceFileInfo;
+	}
+
+	public function getRevisionId(): int {
+		return $this->revisionId;
+	}
+
+	public function getTimestamp(): int {
+		return $this->timestamp;
+	}
+
+	public function getSize(): int {
+		return $this->size;
+	}
+
+	public function getSourceFileName(): string {
+		return $this->name;
+	}
+
+	public function getMimeType(): string {
+		return $this->mimetype;
+	}
+
+	public function getVersionPath(): string {
+		return $this->path;
+	}
+
+	public function getUser(): IUser {
+		return $this->user;
+	}
+}
diff --git a/apps/files_versions/lib/Versions/VersionManager.php b/apps/files_versions/lib/Versions/VersionManager.php
new file mode 100644
index 00000000000..757b6002710
--- /dev/null
+++ b/apps/files_versions/lib/Versions/VersionManager.php
@@ -0,0 +1,93 @@
+<?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);
+	}
+}