preload shares for calendars when listing calendars

Signed-off-by: Robin Appelman <robin@icewind.nl>

apps/dav/lib/CalDAV/CalDavBackend.php

@@ -2836,6 +2836,10 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 		return $this->calendarSharingBackend->getShares($resourceId);
 	}
 
+	public function preloadShares(array $resourceIds) {
+		$this->calendarSharingBackend->preloadShares($resourceIds);
+	}
+
 	/**
 	 * @param boolean $value
 	 * @param \OCA\DAV\CalDAV\Calendar $calendar

apps/dav/lib/CalDAV/CalendarHome.php

@@ -58,6 +58,7 @@ class CalendarHome extends \Sabre\CalDAV\CalendarHome {
 
 	/** @var LoggerInterface */
 	private $logger;
+	private ?array $cachedChildren = null;
 
 	public function __construct(BackendInterface $caldavBackend, $principalInfo, LoggerInterface $logger) {
 		parent::__construct($caldavBackend, $principalInfo);
@@ -97,6 +98,9 @@ class CalendarHome extends \Sabre\CalDAV\CalendarHome {
 	 * @inheritdoc
 	 */
 	public function getChildren() {
+		if ($this->cachedChildren) {
+			return $this->cachedChildren;
+		}
 		$calendars = $this->caldavBackend->getCalendarsForUser($this->principalInfo['uri']);
 		$objects = [];
 		foreach ($calendars as $calendar) {
@@ -136,6 +140,7 @@ class CalendarHome extends \Sabre\CalDAV\CalendarHome {
 			}
 		}
 
+		$this->cachedChildren = $objects;
 		return $objects;
 	}
 

apps/dav/lib/DAV/Sharing/Backend.php

@@ -29,6 +29,7 @@
 namespace OCA\DAV\DAV\Sharing;
 
 use OCA\DAV\Connector\Sabre\Principal;
+use OCP\Cache\CappedMemoryCache;
 use OCP\IDBConnection;
 use OCP\IGroupManager;
 use OCP\IUserManager;
@@ -45,12 +46,15 @@ class Backend {
 	public const ACCESS_READ_WRITE = 2;
 	public const ACCESS_READ = 3;
 
+	private CappedMemoryCache $shareCache;
+
 	public function __construct(IDBConnection $db, IUserManager $userManager, IGroupManager $groupManager, Principal $principalBackend, string $resourceType) {
 		$this->db = $db;
 		$this->userManager = $userManager;
 		$this->groupManager = $groupManager;
 		$this->principalBackend = $principalBackend;
 		$this->resourceType = $resourceType;
+		$this->shareCache = new CappedMemoryCache();
 	}
 
 	/**
@@ -58,6 +62,7 @@ class Backend {
 	 * @param list<string> $remove
 	 */
 	public function updateShares(IShareable $shareable, array $add, array $remove): void {
+		$this->shareCache->clear();
 		foreach ($add as $element) {
 			$principal = $this->principalBackend->findByUri($element['href'], '');
 			if ($principal !== '') {
@@ -76,6 +81,7 @@ class Backend {
 	 * @param array{href: string, commonName: string, readOnly: bool} $element
 	 */
 	private function shareWith(IShareable $shareable, array $element): void {
+		$this->shareCache->clear();
 		$user = $element['href'];
 		$parts = explode(':', $user, 2);
 		if ($parts[0] !== 'principal') {
@@ -119,6 +125,7 @@ class Backend {
 	}
 
 	public function deleteAllShares(int $resourceId): void {
+		$this->shareCache->clear();
 		$query = $this->db->getQueryBuilder();
 		$query->delete('dav_shares')
 			->where($query->expr()->eq('resourceid', $query->createNamedParameter($resourceId)))
@@ -127,6 +134,7 @@ class Backend {
 	}
 
 	public function deleteAllSharesByUser(string $principaluri): void {
+		$this->shareCache->clear();
 		$query = $this->db->getQueryBuilder();
 		$query->delete('dav_shares')
 			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principaluri)))
@@ -135,6 +143,7 @@ class Backend {
 	}
 
 	private function unshare(IShareable $shareable, string $element): void {
+		$this->shareCache->clear();
 		$parts = explode(':', $element, 2);
 		if ($parts[0] !== 'principal') {
 			return;
@@ -167,6 +176,10 @@ class Backend {
 	 * @return list<array{href: string, commonName: string, status: int, readOnly: bool, '{http://owncloud.org/ns}principal': string, '{http://owncloud.org/ns}group-share': bool}>
 	 */
 	public function getShares(int $resourceId): array {
+		$cached = $this->shareCache->get($resourceId);
+		if ($cached) {
+			return $cached;
+		}
 		$query = $this->db->getQueryBuilder();
 		$result = $query->select(['principaluri', 'access'])
 			->from('dav_shares')
@@ -188,9 +201,44 @@ class Backend {
 			];
 		}
 
+		$this->shareCache->set($resourceId, $shares);
 		return $shares;
 	}
 
+	public function preloadShares(array $resourceIds) {
+		$resourceIds = array_filter($resourceIds, function(int $resourceId) {
+			return !isset($this->shareCache[$resourceId]);
+		});
+		if (count($resourceIds) === 0) {
+			return;
+		}
+		$query = $this->db->getQueryBuilder();
+		$result = $query->select(['resourceid', 'principaluri', 'access'])
+			->from('dav_shares')
+			->where($query->expr()->in('resourceid', $query->createNamedParameter($resourceIds, IQueryBuilder::PARAM_INT_ARRAY)))
+			->andWhere($query->expr()->eq('type', $query->createNamedParameter($this->resourceType)))
+			->groupBy(['principaluri', 'access', 'resourceid'])
+			->executeQuery();
+
+		$sharesByResource = array_fill_keys($resourceIds, []);
+		while ($row = $result->fetch()) {
+			$resourceId = (int)$row['resourceid'];
+			$p = $this->principalBackend->getPrincipalByPath($row['principaluri']);
+			$sharesByResource[$resourceId][] = [
+				'href' => "principal:{$row['principaluri']}",
+				'commonName' => isset($p['{DAV:}displayname']) ? (string)$p['{DAV:}displayname'] : '',
+				'status' => 1,
+				'readOnly' => (int) $row['access'] === self::ACCESS_READ,
+				'{http://owncloud.org/ns}principal' => (string)$row['principaluri'],
+				'{http://owncloud.org/ns}group-share' => isset($p['uri']) ? str_starts_with($p['uri'], 'principals/groups') : false
+			];
+		}
+
+		foreach ($resourceIds as $resourceId) {
+			$this->shareCache->set($resourceId, $sharesByResource[$resourceId]);
+		}
+	}
+
 	/**
 	 * For shared resources the sharee is set in the ACL of the resource
 	 *

apps/dav/lib/DAV/Sharing/Plugin.php

@@ -24,6 +24,8 @@
  */
 namespace OCA\DAV\DAV\Sharing;
 
+use OCA\DAV\CalDAV\CalDavBackend;
+use OCA\DAV\CalDAV\CalendarHome;
 use OCA\DAV\Connector\Sabre\Auth;
 use OCA\DAV\DAV\Sharing\Xml\Invite;
 use OCA\DAV\DAV\Sharing\Xml\ShareRequest;
@@ -201,6 +203,20 @@ class Plugin extends ServerPlugin {
 	 * @return void
 	 */
 	public function propFind(PropFind $propFind, INode $node) {
+		if ($node instanceof CalendarHome && $propFind->getDepth() === 1) {
+			$backend = $node->getCalDAVBackend();
+			if ($backend instanceof CalDavBackend) {
+				$calendars = $node->getChildren();
+				$calendars = array_filter($calendars, function (INode $node) {
+					return $node instanceof IShareable;
+				});
+				/** @var int[] $resourceIds */
+				$resourceIds = array_map(function (IShareable $node) {
+					return $node->getResourceId();
+				}, $calendars);
+				$backend->preloadShares($resourceIds);
+			}
+		}
 		if ($node instanceof IShareable) {
 			$propFind->handle('{' . Plugin::NS_OWNCLOUD . '}invite', function () use ($node) {
 				return new Invite(