Add a displayname to the database group backend

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

core/Migrations/Version18000Date20190920085628.php

@@ -0,0 +1,74 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019 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 OC\Core\Migrations;
+
+use Closure;
+use Doctrine\DBAL\Types\Type;
+use OCP\DB\ISchemaWrapper;
+use OCP\IDBConnection;
+use OCP\Migration\SimpleMigrationStep;
+use OCP\Migration\IOutput;
+
+class Version18000Date20190920085628 extends SimpleMigrationStep {
+
+	/** @var IDBConnection */
+	protected $connection;
+
+	public function __construct(IDBConnection $connection) {
+		$this->connection = $connection;
+	}
+
+	/**
+	 * @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): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		if ($schema->hasTable('groups')) {
+			$table = $schema->getTable('groups');
+
+			$table->addColumn('displayname', Type::STRING, [
+				'notnull' => true,
+				'length' => 255,
+			]);
+		}
+
+		return $schema;
+	}
+
+	/**
+	 * @param IOutput $output
+	 * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+	 * @param array $options
+	 */
+	public function postSchemaChange(IOutput $output, Closure $schemaClosure, array $options) {
+		$query = $this->connection->getQueryBuilder();
+		$query->update('groups')
+			->set('displayname', 'gid');
+		$query->execute();
+	}
+}

lib/private/Group/Database.php

@@ -49,6 +49,8 @@ use OCP\Group\Backend\ICountDisabledInGroup;
 use OCP\Group\Backend\ICountUsersBackend;
 use OCP\Group\Backend\ICreateGroupBackend;
 use OCP\Group\Backend\IDeleteGroupBackend;
+use OCP\Group\Backend\IGetDisplayNameBackend;
+use OCP\Group\Backend\IGroupDetailsBackend;
 use OCP\Group\Backend\IRemoveFromGroupBackend;
 use OCP\IDBConnection;
 
@@ -61,6 +63,8 @@ class Database extends ABackend
 	           ICountUsersBackend,
 	           ICreateGroupBackend,
 	           IDeleteGroupBackend,
+	           IGetDisplayNameBackend,
+	           IGroupDetailsBackend,
 	           IRemoveFromGroupBackend {
 
 	/** @var string[] */
@@ -414,4 +418,36 @@ class Database extends ABackend
 		return $count;
 	}
 
+	/**
+	 * @param string $gid
+	 * @return string
+	 * @since 17.0.0
+	 */
+	public function getDisplayName(string $gid): string {
+		$query = $this->dbConn->getQueryBuilder();
+		$query->select('displayname')
+			->from('groups')
+			->where($query->expr()->eq('gid', $query->createNamedParameter($gid)));
+
+		$result = $query->execute();
+		$displayName = $result->fetchColumn();
+		$result->closeCursor();
+
+		return (string) $displayName;
+	}
+
+	/**
+	 * @param string $gid
+	 * @return array
+	 * @since 14.0.0
+	 */
+	public function getGroupDetails(string $gid): array {
+		$displayName = $this->getDisplayName($gid);
+		if ($displayName !== '') {
+			return ['displayName' => $displayName];
+		}
+
+		return [];
+	}
+
 }

lib/public/Group/Backend/IGetDisplayNameBackend.php

@@ -28,7 +28,10 @@ namespace OCP\Group\Backend;
  * @since 17.0.0
  */
 interface IGetDisplayNameBackend {
+
 	/**
+	 * @param string $gid
+	 * @return string
 	 * @since 17.0.0
 	 */
 	public function getDisplayName(string $gid): string;