WebDAV Locks

WebDAV has a 'locking' feature that allows a client to use the LOCK and UNLOCK methods on resources.

When a resource is locked, other users are prevented from changing the resource.

This feature is often used for WebDAV servers, and several clients such as davfs and Finder require locks to work in order to enable read-write support. Without it, they fall back to a read-only state.

Enabling locking

To enable locks, the easiest thing to do, is to use use the PDO backend. To do this, you must first create a sqlite or mysql database, and create the table as specified in one of these files:

• examples/sql/sqlite.locks.sql
• examples/sql/mysql.locks.sql

After the database has been created, connect to it using PDO and add the locking plugin to your server.

// Connnect to the database
$pdo = new PDO('sqlite:data/locks.sqlite');

// Create the backend
$locksBackend = new Sabre\DAV\Locks\Backend\PDO($pdo);

// Add the plugin to the server.
$locksPlugin = new Sabre\DAV\Locks\Plugin(
    $locksBackend
);
$server->addPlugin($locksPlugin);

Other backends

SabreDAV also ships with a plugin that stores the data in a file, to use it, just instantiate it with a filename that the server has write-access to:

$locksBackend = new Sabre\DAV\Locks\Backend\File('/tmp/davlocks');

We don't recommend this. SQlite is effectively a 'single file' storage format, and will work much better for these purposes.

It's also possible to create your own, by extending Sabre\DAV\Locks\Backend\AbstractBackend.