LIMIT is no column but a SQL feature, allow limit on initial sync

Signed-off-by: Georg Ehrke <developer@georgehrke.com>

apps/dav/composer/composer/autoload_classmap.php

@@ -147,6 +147,7 @@ return array(
     'OCA\\DAV\\Direct\\DirectHome' => $baseDir . '/../lib/Direct/DirectHome.php',
     'OCA\\DAV\\Direct\\Server' => $baseDir . '/../lib/Direct/Server.php',
     'OCA\\DAV\\Direct\\ServerFactory' => $baseDir . '/../lib/Direct/ServerFactory.php',
+    'OCA\\DAV\\Exception\\UnsupportedLimitOnInitialSyncException' => $baseDir . '/../lib/Exception/UnsupportedLimitOnInitialSyncException.php',
     'OCA\\DAV\\Files\\BrowserErrorPagePlugin' => $baseDir . '/../lib/Files/BrowserErrorPagePlugin.php',
     'OCA\\DAV\\Files\\FileSearchBackend' => $baseDir . '/../lib/Files/FileSearchBackend.php',
     'OCA\\DAV\\Files\\FilesHome' => $baseDir . '/../lib/Files/FilesHome.php',

apps/dav/composer/composer/autoload_static.php

@@ -162,6 +162,7 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\Direct\\DirectHome' => __DIR__ . '/..' . '/../lib/Direct/DirectHome.php',
         'OCA\\DAV\\Direct\\Server' => __DIR__ . '/..' . '/../lib/Direct/Server.php',
         'OCA\\DAV\\Direct\\ServerFactory' => __DIR__ . '/..' . '/../lib/Direct/ServerFactory.php',
+        'OCA\\DAV\\Exception\\UnsupportedLimitOnInitialSyncException' => __DIR__ . '/..' . '/../lib/Exception/UnsupportedLimitOnInitialSyncException.php',
         'OCA\\DAV\\Files\\BrowserErrorPagePlugin' => __DIR__ . '/..' . '/../lib/Files/BrowserErrorPagePlugin.php',
         'OCA\\DAV\\Files\\FileSearchBackend' => __DIR__ . '/..' . '/../lib/Files/FileSearchBackend.php',
         'OCA\\DAV\\Files\\FilesHome' => __DIR__ . '/..' . '/../lib/Files/FilesHome.php',

apps/dav/lib/CalDAV/CachedSubscription.php

@@ -23,6 +23,7 @@ declare(strict_types=1);
  */
 namespace OCA\DAV\CalDAV;
 
+use OCA\DAV\Exception\UnsupportedLimitOnInitialSyncException;
 use Sabre\CalDAV\Backend\BackendInterface;
 use Sabre\DAV\Exception\MethodNotAllowed;
 use Sabre\DAV\Exception\NotFound;
@@ -195,4 +196,15 @@ class CachedSubscription extends \Sabre\CalDAV\Calendar {
 	public function calendarQuery(array $filters):array {
 		return $this->caldavBackend->calendarQuery($this->calendarInfo['id'], $filters, CalDavBackend::CALENDAR_TYPE_SUBSCRIPTION);
 	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getChanges($syncToken, $syncLevel, $limit = null) {
+		if (!$syncToken && $limit) {
+			throw new UnsupportedLimitOnInitialSyncException();
+		}
+
+		return parent::getChanges($syncToken, $syncLevel, $limit);
+	}
 }

apps/dav/lib/CalDAV/Calendar.php

@@ -27,6 +27,7 @@
 namespace OCA\DAV\CalDAV;
 
 use OCA\DAV\DAV\Sharing\IShareable;
+use OCA\DAV\Exception\UnsupportedLimitOnInitialSyncException;
 use OCP\IConfig;
 use OCP\IL10N;
 use Sabre\CalDAV\Backend\BackendInterface;
@@ -339,4 +340,14 @@ class Calendar extends \Sabre\CalDAV\Calendar implements IShareable {
 		return isset($this->calendarInfo['{http://calendarserver.org/ns/}source']);
 	}
 
+	/**
+	 * @inheritDoc
+	 */
+	public function getChanges($syncToken, $syncLevel, $limit = null) {
+		if (!$syncToken && $limit) {
+			throw new UnsupportedLimitOnInitialSyncException();
+		}
+
+		return parent::getChanges($syncToken, $syncLevel, $limit);
+	}
 }

apps/dav/lib/CardDAV/AddressBook.php

@@ -23,6 +23,7 @@
 namespace OCA\DAV\CardDAV;
 
 use OCA\DAV\DAV\Sharing\IShareable;
+use OCA\DAV\Exception\UnsupportedLimitOnInitialSyncException;
 use OCP\IL10N;
 use Sabre\CardDAV\Backend\BackendInterface;
 use Sabre\CardDAV\Card;
@@ -219,4 +220,12 @@ class AddressBook extends \Sabre\CardDAV\AddressBook implements IShareable {
 		}
 		return true;
 	}
+
+	public function getChanges($syncToken, $syncLevel, $limit = null) {
+		if (!$syncToken && $limit) {
+			throw new UnsupportedLimitOnInitialSyncException();
+		}
+
+		return parent::getChanges($syncToken, $syncLevel, $limit);
+	}
 }

apps/dav/lib/CardDAV/CardDavBackend.php

@@ -814,7 +814,7 @@ class CardDavBackend implements BackendInterface, SyncSupport {
 
 			$query = "SELECT `uri`, `operation` FROM `*PREFIX*addressbookchanges` WHERE `synctoken` >= ? AND `synctoken` < ? AND `addressbookid` = ? ORDER BY `synctoken`";
 			if ($limit>0) {
-				$query .= " `LIMIT` " . (int)$limit;
+				$query .= " LIMIT " . (int)$limit;
 			}
 
 			// Fetching all changes

apps/dav/lib/Exception/UnsupportedLimitOnInitialSyncException.php

@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * @copyright Copyright (c) 2019 Georg Ehrke
+ *
+ * @author Georg Ehrke <oc.list@georgehrke.com>
+ *
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCA\DAV\Exception;
+
+use Sabre\DAV\Exception\InsufficientStorage;
+use Sabre\DAV\Server;
+
+/**
+ * Class UnsupportedLimitOnInitialSyncException
+ *
+ * @package OCA\DAV\Exception
+ */
+class UnsupportedLimitOnInitialSyncException extends InsufficientStorage {
+
+	/**
+	 * @inheritDoc
+	 */
+	public function serialize(Server $server, \DOMElement $errorNode) {
+		$errorNode->appendChild($errorNode->ownerDocument->createElementNS('DAV:', 'd:number-of-matches-within-limits'));
+	}
+}