Fix the FreeBusy request handling for proper scheduling support

apps/dav/appinfo/v1/caldav.php

@@ -44,6 +44,8 @@
 $principalBackend = new Principal(
 	\OC::$server->getUserManager(),
 	\OC::$server->getGroupManager(),
+	\OC::$server->getShareManager(),
+	\OC::$server->getUserSession(),
 	'principals/'
 );
 $db = \OC::$server->getDatabaseConnection();

apps/dav/appinfo/v1/carddav.php

@@ -45,6 +45,8 @@
 $principalBackend = new Principal(
 	\OC::$server->getUserManager(),
 	\OC::$server->getGroupManager(),
+	\OC::$server->getShareManager(),
+	\OC::$server->getUserSession(),
 	'principals/'
 );
 $db = \OC::$server->getDatabaseConnection();

apps/dav/composer/composer/autoload_classmap.php

@@ -30,6 +30,8 @@
     'OCA\\DAV\\CalDAV\\CalendarObject' => $baseDir . '/../lib/CalDAV/CalendarObject.php',
     'OCA\\DAV\\CalDAV\\CalendarRoot' => $baseDir . '/../lib/CalDAV/CalendarRoot.php',
     'OCA\\DAV\\CalDAV\\Plugin' => $baseDir . '/../lib/CalDAV/Plugin.php',
+    'OCA\\DAV\\CalDAV\\Principal\\Collection' => $baseDir . '/../lib/CalDAV/Principal/Collection.php',
+    'OCA\\DAV\\CalDAV\\Principal\\User' => $baseDir . '/../lib/CalDAV/Principal/User.php',
     'OCA\\DAV\\CalDAV\\PublicCalendar' => $baseDir . '/../lib/CalDAV/PublicCalendar.php',
     'OCA\\DAV\\CalDAV\\PublicCalendarObject' => $baseDir . '/../lib/CalDAV/PublicCalendarObject.php',
     'OCA\\DAV\\CalDAV\\PublicCalendarRoot' => $baseDir . '/../lib/CalDAV/PublicCalendarRoot.php',

apps/dav/composer/composer/autoload_static.php

@@ -45,6 +45,8 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\CalDAV\\CalendarObject' => __DIR__ . '/..' . '/../lib/CalDAV/CalendarObject.php',
         'OCA\\DAV\\CalDAV\\CalendarRoot' => __DIR__ . '/..' . '/../lib/CalDAV/CalendarRoot.php',
         'OCA\\DAV\\CalDAV\\Plugin' => __DIR__ . '/..' . '/../lib/CalDAV/Plugin.php',
+        'OCA\\DAV\\CalDAV\\Principal\\Collection' => __DIR__ . '/..' . '/../lib/CalDAV/Principal/Collection.php',
+        'OCA\\DAV\\CalDAV\\Principal\\User' => __DIR__ . '/..' . '/../lib/CalDAV/Principal/User.php',
         'OCA\\DAV\\CalDAV\\PublicCalendar' => __DIR__ . '/..' . '/../lib/CalDAV/PublicCalendar.php',
         'OCA\\DAV\\CalDAV\\PublicCalendarObject' => __DIR__ . '/..' . '/../lib/CalDAV/PublicCalendarObject.php',
         'OCA\\DAV\\CalDAV\\PublicCalendarRoot' => __DIR__ . '/..' . '/../lib/CalDAV/PublicCalendarRoot.php',

apps/dav/lib/CalDAV/CalDavBackend.php

@@ -353,7 +353,7 @@ function getCalendarsForUser($principalUri) {
 				'{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
 				'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
 				'{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
-				'{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
+				'{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp('transparent'),
 				'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
 				$readOnlyPropertyName => $readOnly,
 			];

apps/dav/lib/CalDAV/Principal/Collection.php

@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * @copyright Copyright (c) 2017, Christoph Seitz <[email protected]>
+ *
+ * @author Christoph Seitz <[email protected]>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * 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\CalDAV\Principal;
+
+use OCA\DAV\CalDAV\Principal\User;
+
+/**
+ * Class Collection
+ *
+ * @package OCA\DAV\CalDAV\Principal
+ */
+class Collection extends \Sabre\CalDAV\Principal\Collection {
+
+	/**
+	 * Returns a child object based on principal information
+	 *
+	 * @param array $principalInfo
+	 * @return User
+	 */
+	function getChildForPrincipal(array $principalInfo) {
+		return new User($this->principalBackend, $principalInfo);
+	}
+
+}

apps/dav/lib/CalDAV/Principal/User.php

@@ -0,0 +1,55 @@
+<?php
+
+/**
+ * @copyright Copyright (c) 2017, Christoph Seitz <[email protected]>
+ *
+ * @author Christoph Seitz <[email protected]>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * 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\CalDAV\Principal;
+
+/**
+ * Class User
+ *
+ * @package OCA\DAV\CalDAV\Principal
+ */
+class User extends \Sabre\CalDAV\Principal\User {
+
+	/**
+	 * Returns a list of ACE's for this node.
+	 *
+	 * Each ACE has the following properties:
+	 *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+	 *     currently the only supported privileges
+	 *   * 'principal', a url to the principal who owns the node
+	 *   * 'protected' (optional), indicating that this ACE is not allowed to
+	 *      be updated.
+	 *
+	 * @return array
+	 */
+	function getACL() {
+		$acl = parent::getACL();
+		$acl[] = [
+			'privilege' => '{DAV:}read',
+			'principal' => '{DAV:}authenticated',
+			'protected' => true,
+		];
+		return $acl;
+	}
+
+}

apps/dav/lib/Command/CreateCalendar.php

@@ -75,7 +75,9 @@ protected function execute(InputInterface $input, OutputInterface $output) {
 		}
 		$principalBackend = new Principal(
 			$this->userManager,
-			$this->groupManager
+			$this->groupManager,
+			\OC::$server->getShareManager(),
+			\OC::$server->getUserSession()
 		);
 		$random = \OC::$server->getSecureRandom();
 		$logger = \OC::$server->getLogger();

apps/dav/lib/Connector/Sabre/Principal.php

@@ -34,6 +34,8 @@
 use OCP\IGroupManager;
 use OCP\IUser;
 use OCP\IUserManager;
+use OCP\IUserSession;
+use OCP\Share\IManager as IShareManager;
 use Sabre\DAV\Exception;
 use \Sabre\DAV\PropPatch;
 use Sabre\DAVACL\PrincipalBackend\BackendInterface;
@@ -47,6 +49,12 @@ class Principal implements BackendInterface {
 	/** @var IGroupManager */
 	private $groupManager;
 
+	/** @var IShareManager */
+	private $shareManager;
+
+	/** @var IUserSession */
+	private $userSession;
+
 	/** @var string */
 	private $principalPrefix;
 
@@ -56,13 +64,19 @@ class Principal implements BackendInterface {
 	/**
 	 * @param IUserManager $userManager
 	 * @param IGroupManager $groupManager
+	 * @param IShareManager $shareManager
+	 * @param IUserSession $userSession
 	 * @param string $principalPrefix
 	 */
 	public function __construct(IUserManager $userManager,
 								IGroupManager $groupManager,
+								IShareManager $shareManager,
+								IUserSession $userSession,
 								$principalPrefix = 'principals/users/') {
 		$this->userManager = $userManager;
 		$this->groupManager = $groupManager;
+		$this->shareManager = $shareManager;
+		$this->userSession = $userSession;
 		$this->principalPrefix = trim($principalPrefix, '/');
 		$this->hasGroups = ($principalPrefix === 'principals/users/');
 	}
@@ -106,7 +120,7 @@ public function getPrincipalByPath($path) {
 		if ($prefix === $this->principalPrefix) {
 			$user = $this->userManager->get($name);
 
-			if (!is_null($user)) {
+			if ($user !== null) {
 				return $this->userToPrincipal($user);
 			}
 		}
@@ -182,14 +196,92 @@ function updatePrincipal($path, PropPatch $propPatch) {
 		return 0;
 	}
 
+	/**
+	 * Search user principals
+	 *
+	 * @param array $searchProperties
+	 * @param string $test
+	 * @return array
+	 */
+	protected function searchUserPrincipals(array $searchProperties, $test = 'allof') {
+		$results = [];
+
+		// If sharing is disabled, return the empty array
+		if (!$this->shareManager->shareApiEnabled()) {
+			return [];
+		}
+
+		// If sharing is restricted to group members only,
+		// return only members that have groups in common
+		$restrictGroups = false;
+		if ($this->shareManager->shareWithGroupMembersOnly()) {
+			$user = $this->userSession->getUser();
+			if (!$user) {
+				return [];
+			}
+
+			$restrictGroups = $this->groupManager->getUserGroupIds($user);
+		}
+
+		foreach ($searchProperties as $prop => $value) {
+			switch ($prop) {
+				case '{http://sabredav.org/ns}email-address':
+					$users = $this->userManager->getByEmail($value);
+
+					$results[] = array_reduce($users, function(array $carry, IUser $user) use ($restrictGroups) {
+						// is sharing restricted to groups only?
+						if ($restrictGroups !== false) {
+							$userGroups = $this->groupManager->getUserGroupIds($user);
+							if (count(array_intersect($userGroups, $restrictGroups)) === 0) {
+								return $carry;
+							}
+						}
+
+						$carry[] = $this->principalPrefix . '/' . $user->getUID();
+						return $carry;
+					}, []);
+					break;
+
+				default:
+					$results[] = [];
+					break;
+			}
+		}
+
+		// results is an array of arrays, so this is not the first search result
+		// but the results of the first searchProperty
+		if (count($results) === 1) {
+			return $results[0];
+		}
+
+		switch ($test) {
+			case 'anyof':
+				return array_unique(array_merge(...$results));
+
+			case 'allof':
+			default:
+				return array_intersect(...$results);
+		}
+	}
+
 	/**
 	 * @param string $prefixPath
 	 * @param array $searchProperties
 	 * @param string $test
 	 * @return array
 	 */
 	function searchPrincipals($prefixPath, array $searchProperties, $test = 'allof') {
-		return [];
+		if (count($searchProperties) === 0) {
+			return [];
+		}
+
+		switch ($prefixPath) {
+			case 'principals/users':
+				return $this->searchUserPrincipals($searchProperties, $test);
+
+			default:
+				return [];
+		}
 	}
 
 	/**
@@ -198,15 +290,43 @@ function searchPrincipals($prefixPath, array $searchProperties, $test = 'allof')
 	 * @return string
 	 */
 	function findByUri($uri, $principalPrefix) {
-		if (substr($uri, 0, 7) === 'mailto:') {
-			$email = substr($uri, 7);
-			$users = $this->userManager->getByEmail($email);
-			if (count($users) === 1) {
-				return $this->principalPrefix . '/' . $users[0]->getUID();
+		// If sharing is disabled, return null as in user not found
+		if (!$this->shareManager->shareApiEnabled()) {
+			return null;
+		}
+
+		// If sharing is restricted to group members only,
+		// return only members that have groups in common
+		$restrictGroups = false;
+		if ($this->shareManager->shareWithGroupMembersOnly()) {
+			$user = $this->userSession->getUser();
+			if (!$user) {
+				return null;
+			}
+
+			$restrictGroups = $this->groupManager->getUserGroupIds($user);
+		}
+
+		if (strpos($uri, 'mailto:') === 0) {
+			if ($principalPrefix === 'principals/users') {
+				$users = $this->userManager->getByEmail(substr($uri, 7));
+				if (count($users) !== 1) {
+					return null;
+				}
+				$user = $users[0];
+
+				if ($restrictGroups !== false) {
+					$userGroups = $this->groupManager->getUserGroupIds($user);
+					if (count(array_intersect($userGroups, $restrictGroups)) === 0) {
+						return null;
+					}
+				}
+
+				return $this->principalPrefix . '/' . $user->getUID();
 			}
 		}
 
-		return '';
+		return null;
 	}
 
 	/**

apps/dav/lib/RootCollection.php

@@ -32,7 +32,7 @@
 use OCA\DAV\Connector\Sabre\Principal;
 use OCA\DAV\DAV\GroupPrincipalBackend;
 use OCA\DAV\DAV\SystemPrincipalBackend;
-use Sabre\CalDAV\Principal\Collection;
+use OCA\DAV\CalDAV\Principal\Collection;
 use Sabre\DAV\SimpleCollection;
 
 class RootCollection extends SimpleCollection {
@@ -43,11 +43,14 @@ public function __construct() {
 		$logger = \OC::$server->getLogger();
 		$userManager = \OC::$server->getUserManager();
 		$groupManager = \OC::$server->getGroupManager();
+		$shareManager = \OC::$server->getShareManager();
 		$db = \OC::$server->getDatabaseConnection();
 		$dispatcher = \OC::$server->getEventDispatcher();
 		$userPrincipalBackend = new Principal(
 			$userManager,
-			$groupManager
+			$groupManager,
+			$shareManager,
+			\OC::$server->getUserSession()
 		);
 		$groupPrincipalBackend = new GroupPrincipalBackend($groupManager);
 		// as soon as debug mode is enabled we allow listing of principals