Add a repair step that updates the display name for existing users

Signed-off-by: Joas Schilling <coding@schilljs.com>

appinfo/info.xml

@@ -16,7 +16,7 @@ And in the works for the [coming versions](https://github.com/nextcloud/spreed/m
 
 	]]></description>
 
-	<version>12.0.0-dev.3</version>
+	<version>12.0.0-dev.4</version>
 	<licence>agpl</licence>
 
 	<author>Daniel Calviño Sánchez</author>
@@ -68,6 +68,7 @@ And in the works for the [coming versions](https://github.com/nextcloud/spreed/m
 		<post-migration>
 			<step>OCA\Talk\Migration\CreateHelpCommand</step>
 			<step>OCA\Talk\Migration\ClearResourceAccessCache</step>
+			<step>OCA\Talk\Migration\CacheUserDisplayNames</step>
 		</post-migration>
 		<install>
 			<step>OCA\Talk\Migration\CreateHelpCommand</step>

lib/Migration/CacheUserDisplayNames.php

@@ -0,0 +1,78 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2021 Joas Schilling <coding@schilljs.com>
+ *
+ * @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\Talk\Migration;
+
+use OCA\Talk\Model\Attendee;
+use OCP\IDBConnection;
+use OCP\IUser;
+use OCP\IUserManager;
+use OCP\Migration\IOutput;
+use OCP\Migration\IRepairStep;
+
+class CacheUserDisplayNames implements IRepairStep {
+
+	/** @var IDBConnection */
+	protected $connection;
+	/** @var IUserManager */
+	protected $userManager;
+
+	public function __construct(IDBConnection $connection,
+								IUserManager $userManager) {
+		$this->connection = $connection;
+		$this->userManager = $userManager;
+	}
+
+	public function getName(): string {
+		return 'Cache the user display names';
+	}
+
+	public function run(IOutput $output): void {
+		$update = $this->connection->getQueryBuilder();
+		$update->update('talk_attendees')
+			->set('display_name', $update->createParameter('displayName'))
+			->where($update->expr()->eq('actor_type', $update->createParameter('actorType')))
+			->andWhere($update->expr()->eq('actor_id', $update->createParameter('actorId')));
+
+		$query = $this->connection->getQueryBuilder();
+		$query->select('actor_id')
+			->from('talk_attendees')
+			->where($query->expr()->eq('actor_type', $query->createNamedParameter(Attendee::ACTOR_USERS)))
+			->andWhere($query->expr()->eq('display_name', $query->createNamedParameter('')))
+			->groupBy('actor_id');
+
+		$result = $query->execute();
+		while ($row = $result->fetch()) {
+			$user = $this->userManager->get($row['actor_id']);
+			if (!$user instanceof IUser) {
+				continue;
+			}
+
+			$update->setParameter('displayName', $user->getDisplayName())
+				->setParameter('actorType', Attendee::ACTOR_USERS)
+				->setParameter('actorId', $row['actor_id']);
+			$update->execute();
+		}
+		$result->closeCursor();
+	}
+}