Fix TODO and bring in abstraction (similar to comments)

apps/dav/lib/RootCollection.php

@@ -71,8 +71,7 @@ class RootCollection extends SimpleCollection {
 			\OC::$server->getSystemTagManager(),
 			\OC::$server->getSystemTagObjectMapper(),
 			\OC::$server->getUserSession(),
-			\OC::$server->getGroupManager(),
-			\OC::$server->getRootFolder()
+			\OC::$server->getGroupManager()
 		);
 		$commentsCollection = new Comments\RootCollection(
 			\OC::$server->getCommentsManager(),

apps/dav/lib/SystemTag/SystemTagsObjectTypeCollection.php

@@ -31,7 +31,6 @@ use OCP\SystemTag\ISystemTagManager;
 use OCP\SystemTag\ISystemTagObjectMapper;
 use OCP\IUserSession;
 use OCP\IGroupManager;
-use OCP\Files\IRootFolder;
 
 /**
  * Collection containing object ids by object type
@@ -64,9 +63,9 @@ class SystemTagsObjectTypeCollection implements ICollection {
 	private $userSession;
 
 	/**
-	 * @var IRootFolder
+	 * @var \Closure
 	 **/
-	protected $fileRoot;
+	protected $childExistsFunction;
 
 	/**
 	 * Constructor
@@ -76,7 +75,7 @@ class SystemTagsObjectTypeCollection implements ICollection {
 	 * @param ISystemTagObjectMapper $tagMapper
 	 * @param IUserSession $userSession
 	 * @param IGroupManager $groupManager
-	 * @param IRootFolder $fileRoot
+	 * @param \Closure $childExistsFunction
 	 */
 	public function __construct(
 		$objectType, 
@@ -84,14 +83,14 @@ class SystemTagsObjectTypeCollection implements ICollection {
 		ISystemTagObjectMapper $tagMapper,
 		IUserSession $userSession,
 		IGroupManager $groupManager,
-		IRootFolder $fileRoot
+		\Closure $childExistsFunction
 	) {
 		$this->tagManager = $tagManager;
 		$this->tagMapper = $tagMapper;
 		$this->objectType = $objectType;
 		$this->userSession = $userSession;
 		$this->groupManager = $groupManager;
-		$this->fileRoot = $fileRoot;
+		$this->childExistsFunction = $childExistsFunction;
 	}
 
 	/**
@@ -133,17 +132,13 @@ class SystemTagsObjectTypeCollection implements ICollection {
 	}
 
 	/**
+	 * Checks if a child-node with the specified name exists
+	 *
 	 * @param string $name
+	 * @return bool
 	 */
 	function childExists($name) {
-		// TODO: make this more abstract
-		if ($this->objectType === 'files') {
-			// make sure the object is reachable for the current user
-			$userId = $this->userSession->getUser()->getUID();
-			$nodes = $this->fileRoot->getUserFolder($userId)->getById(intval($name));
-			return !empty($nodes);
-		}
-		return true;
+		return call_user_func($this->childExistsFunction, $name);
 	}
 
 	function delete() {

apps/dav/lib/SystemTag/SystemTagsRelationsCollection.php

@@ -29,7 +29,6 @@ use Sabre\DAV\Exception\Forbidden;
 use Sabre\DAV\SimpleCollection;
 use OCP\IUserSession;
 use OCP\IGroupManager;
-use OCP\Files\IRootFolder;
 
 class SystemTagsRelationsCollection extends SimpleCollection {
 
@@ -40,14 +39,12 @@ class SystemTagsRelationsCollection extends SimpleCollection {
 	 * @param ISystemTagObjectMapper $tagMapper
 	 * @param IUserSession $userSession
 	 * @param IGroupManager $groupManager
-	 * @param IRootFolder $fileRoot
 	 */
 	public function __construct(
 		ISystemTagManager $tagManager,
 		ISystemTagObjectMapper $tagMapper,
 		IUserSession $userSession,
-		IGroupManager $groupManager,
-		IRootFolder $fileRoot
+		IGroupManager $groupManager
 	) {
 		$children = [
 			new SystemTagsObjectTypeCollection(
@@ -56,7 +53,10 @@ class SystemTagsRelationsCollection extends SimpleCollection {
 				$tagMapper,
 				$userSession,
 				$groupManager,
-				$fileRoot
+				function($name) {
+					$nodes = \OC::$server->getUserFolder()->getById(intval($name));
+					return !empty($nodes);
+				}
 			),
 		];
 

apps/dav/tests/unit/SystemTag/SystemTagsObjectTypeCollectionTest.php

@@ -71,13 +71,12 @@ class SystemTagsObjectTypeCollectionTest extends \Test\TestCase {
 
 		$this->userFolder = $this->getMockBuilder('\OCP\Files\Folder')
 			->getMock();
+		$userFolder = $this->userFolder;
 
-		$fileRoot = $this->getMockBuilder('\OCP\Files\IRootFolder')
-			->getMock();
-		$fileRoot->expects($this->any())
-			->method('getUserfolder')
-			->with('testuser')
-			->will($this->returnValue($this->userFolder));
+		$closure = function($name) use ($userFolder) {
+			$nodes = $userFolder->getById(intval($name));
+			return !empty($nodes);
+		};
 
 		$this->node = new \OCA\DAV\SystemTag\SystemTagsObjectTypeCollection(
 			'files',
@@ -85,7 +84,7 @@ class SystemTagsObjectTypeCollectionTest extends \Test\TestCase {
 			$this->tagMapper,
 			$userSession,
 			$groupManager,
-			$fileRoot
+			$closure
 		);
 	}