Add table to handle calendar delegations

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

apps/dav/appinfo/info.xml

@@ -5,7 +5,7 @@
 	<name>WebDAV</name>
 	<summary>WebDAV endpoint</summary>
 	<description>WebDAV endpoint</description>
-	<version>1.11.0</version>
+	<version>1.11.1</version>
 	<licence>agpl</licence>
 	<author>owncloud.org</author>
 	<namespace>DAV</namespace>

apps/dav/lib/Migration/Version1011Date20190806104428.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\DAV\Migration;
+
+use Closure;
+use Doctrine\DBAL\Types\Type;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\SimpleMigrationStep;
+use OCP\Migration\IOutput;
+
+/**
+ * Auto-generated migration step: Please modify to your needs!
+ */
+class Version1011Date20190806104428 extends SimpleMigrationStep {
+	/**
+	 * @param IOutput $output
+	 * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+	 * @param array $options
+	 * @return null|ISchemaWrapper
+	 */
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options) {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		$table = $schema->createTable('dav_cal_proxy');
+		$table->addColumn('id', Type::BIGINT, [
+			'autoincrement' => true,
+			'notnull' => true,
+			'length' => 11,
+			'unsigned' => true,
+		]);
+		$table->addColumn('owner_id', Type::STRING, [
+			'notnull' => true,
+			'length' => 64,
+		]);
+		$table->addColumn('proxy_id', Type::STRING, [
+			'notnull' => true,
+			'length' => 64,
+		]);
+		$table->addColumn('permissions', Type::INTEGER, [
+			'notnull' => false,
+			'length' => 4,
+			'unsigned' => true,
+		]);
+
+		$table->setPrimaryKey(['id']);
+		$table->addUniqueIndex(['owner_id', 'proxy_id', 'permissions'], 'dav_cal_proxy_uidx');
+
+		return $schema;
+	}
+}