1 files changed, 109 insertions, 0 deletions
diff --git a/lib/private/Repair/RepairDavShares.php b/lib/private/Repair/RepairDavShares.php
new file mode 100644
index 00000000000..557e2c080ca
--- /dev/null
+++ b/lib/private/Repair/RepairDavShares.php
@@ -0,0 +1,109 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OC\Repair;
+
+use OCP\DB\Exception;
+use OCP\IConfig;
+use OCP\IDBConnection;
+use OCP\IGroupManager;
+use OCP\Migration\IOutput;
+use OCP\Migration\IRepairStep;
+use Psr\Log\LoggerInterface;
+use function strlen;
+use function substr;
+use function urldecode;
+use function urlencode;
+
+class RepairDavShares implements IRepairStep {
+	protected const GROUP_PRINCIPAL_PREFIX = 'principals/groups/';
+
+	/** @var bool */
+	private $hintInvalidShares = false;
+
+	public function __construct(
+		private IConfig $config,
+		private IDBConnection $dbc,
+		private IGroupManager $groupManager,
+		private LoggerInterface $logger,
+	) {
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getName() {
+		return 'Repair DAV shares';
+	}
+
+	protected function repairUnencodedGroupShares() {
+		$qb = $this->dbc->getQueryBuilder();
+		$qb->select(['id', 'principaluri'])
+			->from('dav_shares')
+			->where($qb->expr()->like('principaluri', $qb->createNamedParameter(self::GROUP_PRINCIPAL_PREFIX . '%')));
+
+		$updateQuery = $this->dbc->getQueryBuilder();
+		$updateQuery->update('dav_shares')
+			->set('principaluri', $updateQuery->createParameter('updatedPrincipalUri'))
+			->where($updateQuery->expr()->eq('id', $updateQuery->createParameter('shareId')));
+
+		$statement = $qb->execute();
+		while ($share = $statement->fetch()) {
+			$gid = substr($share['principaluri'], strlen(self::GROUP_PRINCIPAL_PREFIX));
+			$decodedGid = urldecode($gid);
+			$encodedGid = urlencode($gid);
+			if ($gid === $encodedGid
+				|| !$this->groupManager->groupExists($gid)
+				|| ($gid !== $decodedGid && $this->groupManager->groupExists($decodedGid))
+			) {
+				$this->hintInvalidShares = $this->hintInvalidShares || $gid !== $encodedGid;
+				continue;
+			}
+
+			// Repair when
+			// + the group name needs encoding
+			// + AND it is not encoded yet
+			// + AND there are no ambivalent groups
+
+			try {
+				$fixedPrincipal = self::GROUP_PRINCIPAL_PREFIX . $encodedGid;
+				$logParameters = [
+					'app' => 'core',
+					'id' => $share['id'],
+					'old' => $share['principaluri'],
+					'new' => $fixedPrincipal,
+				];
+				$updateQuery
+					->setParameter('updatedPrincipalUri', $fixedPrincipal)
+					->setParameter('shareId', $share['id'])
+					->execute();
+				$this->logger->info('Repaired principal for dav share {id} from {old} to {new}', $logParameters);
+			} catch (Exception $e) {
+				$logParameters['message'] = $e->getMessage();
+				$logParameters['exception'] = $e;
+				$this->logger->info('Could not repair principal for dav share {id} from {old} to {new}: {message}', $logParameters);
+			}
+		}
+		return true;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function run(IOutput $output) {
+		$versionFromBeforeUpdate = $this->config->getSystemValueString('version', '0.0.0');
+		if (version_compare($versionFromBeforeUpdate, '20.0.8', '<')
+			&& $this->repairUnencodedGroupShares()
+		) {
+			$output->info('Repaired DAV group shares');
+			if ($this->hintInvalidShares) {
+				$output->info('Invalid shares might be left in the database, running "occ dav:remove-invalid-shares" can remove them.');
+			}
+		}
+	}
+}