1 files changed, 42 insertions, 0 deletions
diff --git a/lib/public/UserMigration/TMigratorBasicVersionHandling.php b/lib/public/UserMigration/TMigratorBasicVersionHandling.php
new file mode 100644
index 00000000000..b33425a023d
--- /dev/null
+++ b/lib/public/UserMigration/TMigratorBasicVersionHandling.php
@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCP\UserMigration;
+
+/**
+ * Basic version handling: we can import older versions but not newer ones
+ * @since 24.0.0
+ */
+trait TMigratorBasicVersionHandling {
+	protected int $version = 1;
+
+	protected bool $mandatory = false;
+
+	/**
+	 * {@inheritDoc}
+	 * @since 24.0.0
+	 */
+	public function getVersion(): int {
+		return $this->version;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 * @since 24.0.0
+	 */
+	public function canImport(
+		IImportSource $importSource,
+	): bool {
+		$version = $importSource->getMigratorVersion($this->getId());
+		if ($version === null) {
+			return !$this->mandatory;
+		}
+		return ($this->version >= $version);
+	}
+}