Make 2FA providers stateful

This adds persistence to the Nextcloud server 2FA logic so that the server
knows which 2FA providers are enabled for a specific user at any time, even
when the provider is not available.

The `IStatefulProvider` interface was added as tagging interface for providers
that are compatible with this new API.

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

1 files changed, 62 insertions, 0 deletions

diff --git a/core/Migrations/Version14000Date20180522074438.php b/core/Migrations/Version14000Date20180522074438.php
new file mode 100644
index 00000000000..bbb805a9cda
--- /dev/null
+++ b/core/Migrations/Version14000Date20180522074438.php
@@ -0,0 +1,62 @@
+<?php
+
+/**
+ * @copyright 2018 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2018 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @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 OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version14000Date20180522074438 extends SimpleMigrationStep {
+
+	public function changeSchema(IOutput $output, Closure $schemaClosure,
+								 array $options): ISchemaWrapper {
+
+		$schema = $schemaClosure();
+
+		if (!$schema->hasTable('twofactor_providers')) {
+			$table = $schema->createTable('twofactor_providers');
+			$table->addColumn('provider_id', 'string',
+				[
+					'notnull' => true,
+					'length' => 32,
+				]);
+			$table->addColumn('uid', 'string',
+				[
+					'notnull' => true,
+					'length' => 64,
+				]);
+			$table->addColumn('enabled', 'smallint',
+				[
+					'notnull' => true,
+					'length' => 1,
+				]);
+			$table->setPrimaryKey(['provider_id', 'uid']);
+		}
+
+		return $schema;
+	}
+
+}