Add public API for owner based file locking

lib/composer/composer/autoload_classmap.php

@@ -295,6 +295,12 @@
     'OCP\\Files\\InvalidDirectoryException' => $baseDir . '/lib/public/Files/InvalidDirectoryException.php',
     'OCP\\Files\\InvalidPathException' => $baseDir . '/lib/public/Files/InvalidPathException.php',
     'OCP\\Files\\LockNotAcquiredException' => $baseDir . '/lib/public/Files/LockNotAcquiredException.php',
+    'OCP\\Files\\Lock\\ILock' => $baseDir . '/lib/public/Files/Lock/ILock.php',
+    'OCP\\Files\\Lock\\ILockManager' => $baseDir . '/lib/public/Files/Lock/ILockManager.php',
+    'OCP\\Files\\Lock\\ILockProvider' => $baseDir . '/lib/public/Files/Lock/ILockProvider.php',
+    'OCP\\Files\\Lock\\LockContext' => $baseDir . '/lib/public/Files/Lock/LockContext.php',
+    'OCP\\Files\\Lock\\NoLockProviderException' => $baseDir . '/lib/public/Files/Lock/NoLockProviderException.php',
+    'OCP\\Files\\Lock\\OwnerLockedException' => $baseDir . '/lib/public/Files/Lock/OwnerLockedException.php',
     'OCP\\Files\\Mount\\IMountManager' => $baseDir . '/lib/public/Files/Mount/IMountManager.php',
     'OCP\\Files\\Mount\\IMountPoint' => $baseDir . '/lib/public/Files/Mount/IMountPoint.php',
     'OCP\\Files\\Node' => $baseDir . '/lib/public/Files/Node.php',
@@ -1129,6 +1135,7 @@
     'OC\\Files\\Config\\UserMountCacheListener' => $baseDir . '/lib/private/Files/Config/UserMountCacheListener.php',
     'OC\\Files\\FileInfo' => $baseDir . '/lib/private/Files/FileInfo.php',
     'OC\\Files\\Filesystem' => $baseDir . '/lib/private/Files/Filesystem.php',
+    'OC\\Files\\Lock\\LockManager' => $baseDir . '/lib/private/Files/Lock/LockManager.php',
     'OC\\Files\\Mount\\CacheMountProvider' => $baseDir . '/lib/private/Files/Mount/CacheMountProvider.php',
     'OC\\Files\\Mount\\LocalHomeMountProvider' => $baseDir . '/lib/private/Files/Mount/LocalHomeMountProvider.php',
     'OC\\Files\\Mount\\Manager' => $baseDir . '/lib/private/Files/Mount/Manager.php',

lib/composer/composer/autoload_static.php

@@ -324,6 +324,12 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OCP\\Files\\InvalidDirectoryException' => __DIR__ . '/../../..' . '/lib/public/Files/InvalidDirectoryException.php',
         'OCP\\Files\\InvalidPathException' => __DIR__ . '/../../..' . '/lib/public/Files/InvalidPathException.php',
         'OCP\\Files\\LockNotAcquiredException' => __DIR__ . '/../../..' . '/lib/public/Files/LockNotAcquiredException.php',
+        'OCP\\Files\\Lock\\ILock' => __DIR__ . '/../../..' . '/lib/public/Files/Lock/ILock.php',
+        'OCP\\Files\\Lock\\ILockManager' => __DIR__ . '/../../..' . '/lib/public/Files/Lock/ILockManager.php',
+        'OCP\\Files\\Lock\\ILockProvider' => __DIR__ . '/../../..' . '/lib/public/Files/Lock/ILockProvider.php',
+        'OCP\\Files\\Lock\\LockContext' => __DIR__ . '/../../..' . '/lib/public/Files/Lock/LockContext.php',
+        'OCP\\Files\\Lock\\NoLockProviderException' => __DIR__ . '/../../..' . '/lib/public/Files/Lock/NoLockProviderException.php',
+        'OCP\\Files\\Lock\\OwnerLockedException' => __DIR__ . '/../../..' . '/lib/public/Files/Lock/OwnerLockedException.php',
         'OCP\\Files\\Mount\\IMountManager' => __DIR__ . '/../../..' . '/lib/public/Files/Mount/IMountManager.php',
         'OCP\\Files\\Mount\\IMountPoint' => __DIR__ . '/../../..' . '/lib/public/Files/Mount/IMountPoint.php',
         'OCP\\Files\\Node' => __DIR__ . '/../../..' . '/lib/public/Files/Node.php',
@@ -1158,6 +1164,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OC\\Files\\Config\\UserMountCacheListener' => __DIR__ . '/../../..' . '/lib/private/Files/Config/UserMountCacheListener.php',
         'OC\\Files\\FileInfo' => __DIR__ . '/../../..' . '/lib/private/Files/FileInfo.php',
         'OC\\Files\\Filesystem' => __DIR__ . '/../../..' . '/lib/private/Files/Filesystem.php',
+        'OC\\Files\\Lock\\LockManager' => __DIR__ . '/../../..' . '/lib/private/Files/Lock/LockManager.php',
         'OC\\Files\\Mount\\CacheMountProvider' => __DIR__ . '/../../..' . '/lib/private/Files/Mount/CacheMountProvider.php',
         'OC\\Files\\Mount\\LocalHomeMountProvider' => __DIR__ . '/../../..' . '/lib/private/Files/Mount/LocalHomeMountProvider.php',
         'OC\\Files\\Mount\\Manager' => __DIR__ . '/../../..' . '/lib/private/Files/Mount/Manager.php',

lib/private/Files/Lock/LockManager.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace OC\Files\Lock;
+
+use OCP\Files\Lock\ILock;
+use OCP\Files\Lock\ILockManager;
+use OCP\Files\Lock\ILockProvider;
+use OCP\Files\Lock\LockContext;
+use OCP\PreConditionNotMetException;
+
+class LockManager implements ILockManager {
+	private ?ILockProvider $lockProvider = null;
+	private ?LockContext $lockInScope = null;
+
+	public function registerLockProvider(ILockProvider $lockProvider): void {
+		if ($this->lockProvider) {
+			throw new PreConditionNotMetException('There is already a registered lock provider');
+		}
+
+		$this->lockProvider = $lockProvider;
+	}
+
+	public function isLockProviderAvailable(): bool {
+		return $this->lockProvider !== null;
+	}
+
+	public function runInScope(LockContext $lock, callable $callback): void {
+		if (!$this->lockProvider) {
+			$callback();
+			return;
+		}
+
+		if ($this->lockInScope) {
+			throw new PreConditionNotMetException('Could not obtain lock scope as already in use by ' . $this->lockInScope);
+		}
+
+		try {
+			$this->lockInScope = $lock;
+			$callback();
+		} finally {
+			$this->lockInScope = null;
+		}
+	}
+
+	public function getLockInScope(): ?LockContext {
+		return $this->lockInScope;
+	}
+
+	public function getLocks(int $fileId): array {
+		if (!$this->lockProvider) {
+			throw new PreConditionNotMetException('No lock provider available');
+		}
+
+		return $this->lockProvider->getLocks($fileId);
+	}
+
+	public function lock(LockContext $lockInfo): ILock {
+		if (!$this->lockProvider) {
+			throw new PreConditionNotMetException('No lock provider available');
+		}
+
+		return $this->lockProvider->lock($lockInfo);
+	}
+
+	public function unlock(LockContext $lockInfo): void {
+		if (!$this->lockProvider) {
+			throw new PreConditionNotMetException('No lock provider available');
+		}
+
+		$this->lockProvider->unlock($lockInfo);
+	}
+}

lib/private/Server.php

@@ -88,6 +88,7 @@
 use OC\Federation\CloudIdManager;
 use OC\Files\Config\UserMountCache;
 use OC\Files\Config\UserMountCacheListener;
+use OC\Files\Lock\LockManager;
 use OC\Files\Mount\CacheMountProvider;
 use OC\Files\Mount\LocalHomeMountProvider;
 use OC\Files\Mount\ObjectHomeMountProvider;
@@ -175,6 +176,7 @@
 use OCP\Files\IMimeTypeDetector;
 use OCP\Files\IMimeTypeLoader;
 use OCP\Files\IRootFolder;
+use OCP\Files\Lock\ILockManager;
 use OCP\Files\Mount\IMountManager;
 use OCP\Files\NotFoundException;
 use OCP\Files\Storage\IStorageFactory;
@@ -1113,6 +1115,10 @@ public function __construct($webRoot, \OC\Config $config) {
 		/** @deprecated 19.0.0 */
 		$this->registerDeprecatedAlias('LockingProvider', ILockingProvider::class);
 
+		$this->registerService(ILockManager::class, function (Server $c): LockManager {
+			return new LockManager();
+		});
+
 		$this->registerAlias(ILockdownManager::class, 'LockdownManager');
 		$this->registerService(SetupManager::class, function ($c) {
 			// create the setupmanager through the mount manager to resolve the cyclic dependency

lib/public/DirectEditing/IManager.php

@@ -91,4 +91,10 @@ public function cleanup(): int;
 	 * @return bool
 	 */
 	public function isEnabled(): bool;
+
+	/**
+	 * @since 24.0.0
+	 * @return IEditor[]
+	 */
+	public function getEditors(): array;
 }

lib/public/Files/Lock/ILock.php

@@ -0,0 +1,163 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2022 Julius Härtl <[email protected]>
+ *
+ * @author Julius Härtl <[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\Files\Lock;
+
+/**
+ * @since 24.0.0
+ */
+interface ILock {
+
+	/**
+	 * User owned manual lock
+	 *
+	 * This lock type is initiated by a user manually through the web UI or clients
+	 * and will limit editing capabilities on the file to the lock owning user.
+	 *
+	 * @since 24.0.0
+	 */
+	public const TYPE_USER = 0;
+
+	/**
+	 * App owned lock
+	 *
+	 * This lock type is created by collaborative apps like Text or Office to avoid
+	 * outside changes through WevDAV or other apps.
+	 * @since 24.0.0
+	 *
+	 */
+	public const TYPE_APP = 1;
+
+	/**
+	 * Token owned lock
+	 *
+	 * This lock type will bind the ownership to the provided lock token. Any request
+	 * that aims to modify the file will be required to sent the token, the user
+	 * itself is not able to write to files without the token. This will allow
+	 * to limit the locking to an individual client.
+	 *
+	 * @since 24.0.0
+	 */
+	public const TYPE_TOKEN = 2;
+
+	/**
+	 * WebDAV Lock scope exclusive
+	 *
+	 * @since 24.0.0
+	 */
+	public const LOCK_EXCLUSIVE = 1;
+
+	/**
+	 * WebDAV Lock scope shared
+	 *
+	 * @since 24.0.0
+	 */
+	public const LOCK_SHARED = 2;
+
+	/**
+	 * Lock only the resource the lock is applied to
+	 *
+	 * @since 24.0.0
+	 */
+	public const LOCK_DEPTH_ZERO = 0;
+
+	/**
+	 * Lock app resources under the locked one with infinite depth
+	 *
+	 * @since 24.0.0
+	 */
+	public const LOCK_DEPTH_INFINITE = -1;
+
+	/**
+	 * Type of the lock
+	 *
+	 * @psalm-return ILock::TYPE_*
+	 * @since 24.0.0
+	 */
+	public function getType(): int;
+
+	/**
+	 * Owner that holds the lock
+	 *
+	 * Depending on the lock type this is:
+	 * - ILock::TYPE_USER: A user id
+	 * - ILock::TYPE_APP: An app id
+	 * - ILock::TYPE_TOKEN: A user id
+	 *
+	 * @since 24.0.0
+	 */
+	public function getOwner(): string;
+
+	/**
+	 * File id that the lock is holding
+	 *
+	 * @since 24.0.0
+	 */
+	public function getFileId(): int;
+
+	/**
+	 * Timeout of the lock in seconds starting from the created at time
+	 *
+	 * @since 24.0.0
+	 */
+	public function getTimeout(): int;
+
+	/**
+	 * Unix timestamp of the lock creation time
+	 *
+	 * @since 24.0.0
+	 */
+	public function getCreatedAt(): int;
+
+	/**
+	 * Token string as a unique identifier for the lock, usually a UUID
+	 *
+	 * @since 24.0.0
+	 */
+	public function getToken(): string;
+
+	/**
+	 * Lock depth to apply the lock to child resources
+	 *
+	 * @since 24.0.0
+	 */
+	public function getDepth(): int;
+
+	/**
+	 * WebDAV lock scope
+	 *
+	 * @since 24.0.0
+	 * @psalm-return ILock::LOCK_EXCLUSIVE|ILock::LOCK_SHARED
+	 */
+	public function getScope(): int;
+
+	/**
+	 * String representation of the lock to identify it through logging
+	 *
+	 * @since 24.0.0
+	 */
+	public function __toString(): string;
+}

lib/public/Files/Lock/ILockManager.php

@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2022 Julius Härtl <[email protected]>
+ *
+ * @author Julius Härtl <[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\Files\Lock;
+
+use OCP\PreConditionNotMetException;
+
+/**
+ * Manage app integrations with files_lock with collaborative editors
+ *
+ * The OCP parts are mainly for exposing the ability to lock/unlock for apps and
+ * to give the files_lock app a way to register and then be triggered by the apps
+ * while the actual locking implementation is kept in the LockProvider and DAV
+ * plugin from files_lock app.
+ *
+ * @since 24.0.0
+ */
+interface ILockManager extends ILockProvider {
+
+	/**
+	 * @throws PreConditionNotMetException if there is already a lock provider registered
+	 * @since 24.0.0
+	 */
+	public function registerLockProvider(ILockProvider $lockProvider): void;
+
+	/**
+	 * @return bool
+	 * @since 24.0.0
+	 */
+	public function isLockProviderAvailable(): bool;
+
+	/**
+	 * Run within the scope of a given lock condition
+	 *
+	 * The callback will also be executed if no lock provider is present
+	 *
+	 * @since 24.0.0
+	 */
+	public function runInScope(LockContext $lock, callable $callback): void;
+
+	/**
+	 * @throws NoLockProviderException if there is no lock provider available
+	 * @since 24.0.0
+	 */
+	public function getLockInScope(): ?LockContext;
+}