Added dav endpoints for system tags

9 files changed, 889 insertions, 0 deletions

diff --git a/apps/dav/lib/rootcollection.php b/apps/dav/lib/rootcollection.php
index c1635c9cde5..9ee32822bbd 100644
--- a/apps/dav/lib/rootcollection.php
+++ b/apps/dav/lib/rootcollection.php
@@ -33,6 +33,13 @@ class RootCollection extends SimpleCollection {
 		$caldavBackend = new CalDavBackend($db);
 		$calendarRoot = new CalendarRoot($principalBackend, $caldavBackend, 'principals/users');
 		$calendarRoot->disableListing = $disableListing;
+		$systemTagCollection = new SystemTag\SystemTagsByIdCollection(
+			\OC::$server->getSystemTagManager()
+		);
+		$systemTagRelationsCollection = new SystemTag\SystemTagsRelationsCollection(
+			\OC::$server->getSystemTagManager(),
+			\OC::$server->getSystemTagObjectMapper()
+		);
 
 		$usersCardDavBackend = new CardDavBackend($db, $principalBackend);
 		$usersAddressBookRoot = new AddressBookRoot($principalBackend, $usersCardDavBackend, 'principals/users');
@@ -51,6 +58,8 @@ class RootCollection extends SimpleCollection {
 				new SimpleCollection('addressbooks', [
 						$usersAddressBookRoot,
 						$systemAddressBookRoot]),
+				$systemTagCollection,
+				$systemTagRelationsCollection,
 		];
 
 		parent::__construct('root', $children);
diff --git a/apps/dav/lib/server.php b/apps/dav/lib/server.php
index a031f2c442b..ffcbb02db70 100644
--- a/apps/dav/lib/server.php
+++ b/apps/dav/lib/server.php
@@ -60,6 +60,9 @@ class Server {
 		// addressbook plugins
 		$this->server->addPlugin(new \OCA\DAV\CardDAV\Plugin());
 
+		// system tags plugins
+		$this->server->addPlugin(new \OCA\DAV\SystemTag\SystemTagPlugin(\OC::$server->getSystemTagManager()));
+
 		// Finder on OS X requires Class 2 WebDAV support (locking), since we do
 		// not provide locking we emulate it using a fake locking plugin.
 		if($request->isUserAgent(['/WebDAVFS/'])) {
diff --git a/apps/dav/lib/systemtag/systemtagmappingnode.php b/apps/dav/lib/systemtag/systemtagmappingnode.php
new file mode 100644
index 00000000000..97c1afc1401
--- /dev/null
+++ b/apps/dav/lib/systemtag/systemtagmappingnode.php
@@ -0,0 +1,81 @@
+<?php
+/**
+ * @author Vincent Petry <pvince81@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @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\SystemTag;
+
+use Sabre\DAV\Exception\NotFound;
+use Sabre\DAV\Exception\MethodNotAllowed;
+
+use OCP\SystemTag\ISystemTag;
+use OCP\SystemTag\ISystemTagManager;
+use OCP\SystemTag\ISystemTagObjectMapper;
+use OCP\SystemTag\TagNotFoundException;
+
+/**
+ * Mapping node for system tag to object id
+ */
+class SystemTagMappingNode extends SystemTagNode {
+
+	/**
+	 * @var ISystemTagObjectMapper
+	 */
+	private $tagMapper;
+
+	/**
+	 * @var string
+	 */
+	private $objectId;
+
+	/**
+	 * @var string
+	 */
+	private $objectType;
+
+	/**
+	 * Sets up the node, expects a full path name
+	 *
+	 * @param ISystemTag $tag system tag
+	 */
+	public function __construct(
+		ISystemTag $tag,
+		$objectId,
+		$objectType,
+		ISystemTagManager $tagManager,
+		ISystemTagObjectMapper $tagMapper
+	) {
+		$this->objectId = $objectId;
+		$this->objectType = $objectType;
+		$this->tagMapper = $tagMapper;
+		parent::__construct($tag, $tagManager);
+	}
+
+	/**
+	 * Delete tag to object association
+	 */
+	public function delete() {
+		try {
+			$this->tagMapper->unassignTags($this->objectId, $this->objectType, $this->tag->getId());
+		} catch (TagNotFoundException $e) {
+			// can happen if concurrent deletion occurred
+			throw new NotFound('Tag with id ' . $this->tag->getId() . ' not found', 0, $e);
+		}
+	}
+}
diff --git a/apps/dav/lib/systemtag/systemtagnode.php b/apps/dav/lib/systemtag/systemtagnode.php
new file mode 100644
index 00000000000..e425595352e
--- /dev/null
+++ b/apps/dav/lib/systemtag/systemtagnode.php
@@ -0,0 +1,112 @@
+<?php
+/**
+ * @author Vincent Petry <pvince81@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @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\SystemTag;
+
+use Sabre\DAV\Exception\NotFound;
+use Sabre\DAV\Exception\MethodNotAllowed;
+use Sabre\DAV\Exception\Conflict;
+
+use OCP\SystemTag\ISystemTag;
+use OCP\SystemTag\ISystemTagManager;
+use OCP\SystemTag\TagNotFoundException;
+
+class SystemTagNode implements \Sabre\DAV\INode {
+
+	/**
+	 * @var ISystemTag
+	 */
+	protected $tag;
+
+	/**
+	 * @var ISystemTagManager
+	 */
+	protected $tagManager;
+
+	/**
+	 * Sets up the node, expects a full path name
+	 *
+	 * @param ISystemTag $tag system tag
+	 */
+	public function __construct(ISystemTag $tag, ISystemTagManager $tagManager) {
+		$this->tag = $tag;
+		$this->tagManager = $tagManager;
+	}
+
+	/**
+	 *  Returns the id of the tag
+	 *
+	 * @return string
+	 */
+	public function getName() {
+		return $this->tag->getId();
+	}
+
+	/**
+	 * Returns the system tag represented by this node
+	 *
+	 * @return ISystemTag system tag
+	 */
+	public function getSystemTag() {
+		return $this->tag;
+	}
+
+	/**
+	 * Renames the node
+	 *
+	 * @param string $name The new name
+	 *
+	 * @throws \Sabre\DAV\Exception\MethodNotAllowed
+	 */
+	public function setName($name) {
+		throw new MethodNotAllowed();
+	}
+
+	/**
+	 * @param string $name new tag name
+	 * @param bool $userVisible user visible
+	 * @param bool $userAssignable user assignable
+	 */
+	public function update($name, $userVisible, $userAssignable) {
+		try {
+			$this->tagManager->updateTag($name, $userVisible, $userAssignable);
+		} catch (TagAlreadyExistsException $e) {
+			throw new Conflict('Tag with the properties "' . $name . '", ' . $userVisible, ', ' . $userAssignable . ' already exists');
+		}
+	}
+
+	/**
+	 * Returns null, not supported
+	 *
+	 */
+	public function getLastModified() {
+		return null;
+	}
+
+	public function delete() {
+		try {
+			$this->tagManager->deleteTags($this->tag->getId());
+		} catch (TagNotFoundException $e) {
+			// can happen if concurrent deletion occurred
+			throw new NotFound('Tag with id ' . $this->tag->getId() . ' not found', 0, $e);
+		}
+	}
+}
diff --git a/apps/dav/lib/systemtag/systemtagplugin.php b/apps/dav/lib/systemtag/systemtagplugin.php
new file mode 100644
index 00000000000..c2136409649
--- /dev/null
+++ b/apps/dav/lib/systemtag/systemtagplugin.php
@@ -0,0 +1,241 @@
+<?php
+/**
+ * @author Vincent Petry <pvince81@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @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\SystemTag;
+
+use Sabre\DAV\PropFind;
+use Sabre\DAV\PropPatch;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\DAV\Exception\UnsupportedMediaType;
+use Sabre\DAV\Exception\Conflict;
+
+use OCA\DAV\SystemTag\SystemTagNode;
+use OCP\SystemTag\ISystemTag;
+use OCP\SystemTag\ISystemTagManager;
+use OCP\SystemTag\TagAlreadyExistsException;
+
+class SystemTagPlugin extends \Sabre\DAV\ServerPlugin {
+
+	// namespace
+	const NS_OWNCLOUD = 'http://owncloud.org/ns';
+	const ID_PROPERTYNAME = '{http://owncloud.org/ns}id';
+	const DISPLAYNAME_PROPERTYNAME = '{http://owncloud.org/ns}display-name';
+	const USERVISIBLE_PROPERTYNAME = '{http://owncloud.org/ns}user-visible';
+	const USERASSIGNABLE_PROPERTYNAME = '{http://owncloud.org/ns}user-assignable';
+
+	/**
+	 * @var \Sabre\DAV\Server $server
+	 */
+	private $server;
+
+	/**
+	 * @var ISystemTagManager
+	 */
+	protected $tagManager;
+
+	/**
+	 * System tags plugin
+	 *
+	 * @param ISystemTagManager $tagManager tag manager
+	 */
+	public function __construct(ISystemTagManager $tagManager) {
+		$this->tagManager = $tagManager;
+	}
+
+	/**
+	 * This initializes the plugin.
+	 *
+	 * This function is called by \Sabre\DAV\Server, after
+	 * addPlugin is called.
+	 *
+	 * This method should set up the required event subscriptions.
+	 *
+	 * @param \Sabre\DAV\Server $server
+	 * @return void
+	 */
+	public function initialize(\Sabre\DAV\Server $server) {
+
+		$server->xmlNamespaces[self::NS_OWNCLOUD] = 'oc';
+
+		$server->protectedProperties[] = self::ID_PROPERTYNAME;
+
+		$server->on('propFind', array($this, 'handleGetProperties'));
+		$server->on('propPatch', array($this, 'handleUpdateProperties'));
+		$server->on('method:POST', [$this, 'httpPost']);
+
+		$this->server = $server;
+	}
+
+	/**
+	 * We intercept this to handle POST requests on calendars.
+	 *
+	 * @param RequestInterface $request
+	 * @param ResponseInterface $response
+	 * @return null|false
+	 */
+	function httpPost(RequestInterface $request, ResponseInterface $response) {
+		$path = $request->getPath();
+
+		// Making sure the node exists
+		try {
+			$node = $this->server->tree->getNodeForPath($path);
+		} catch (NotFound $e) {
+			return;
+		}
+
+		if ($node instanceof SystemTagsByIdCollection || $node instanceof SystemTagsObjectMappingCollection) {
+			$data = $request->getBodyAsString();
+
+			$tag = $this->createTag($data, $request->getHeader('Content-Type'));
+
+			if ($node instanceof SystemTagsObjectMappingCollection) {
+				// also add to collection
+				$node->createFile($tag->getId());
+				$url = $request->getBaseUrl() . 'systemtags/';
+			} else {
+				$url = $request->getUrl();
+			}
+
+			if ($url[strlen($url) - 1] !== '/') {
+				$url .= '/';
+			}
+
+			$response->setHeader('Location', $url . $tag->getId());
+
+			// created
+			$response->setStatus(201);
+			return false;
+		}
+	}
+
+	/**
+	 * Creates a new tag
+	 *
+	 * @param string $data
+	 * @param string $contentType content type of the data
+	 *
+	 * @return ISystemTag newly created system tag
+	 *
+	 * @throws UnsupportedMediaType if the content type is not supported
+	 * @throws BadRequest if a field was missing
+	 */
+	private function createTag($data, $contentType = 'application/json') {
+		if ($contentType === 'application/json') {
+			$data = json_decode($data, true);
+			// TODO: application/x-www-form-urlencoded ?
+		} else {
+			throw new UnsupportedMediaType();
+		}
+
+		if (!isset($data['name'])) {
+			throw new BadRequest('Missing "name" attribute');
+		}
+
+		$tagName = $data['name'];
+		$userVisible = true;
+		$userAssignable = true;
+
+		if (isset($data['userVisible'])) {
+			$userVisible = (bool)$data['userVisible'];
+		}
+
+		if (isset($data['userAssignable'])) {
+			$userVisible = (bool)$data['userAssignable'];
+		}
+		try {
+			return $this->tagManager->createTag($tagName, $userVisible, $userAssignable);
+		} catch (TagAlreadyExistsException $e) {
+			throw new Conflict('Tag already exists');
+		}
+	}
+
+
+	/**
+	 * Retrieves system tag properties
+	 *
+	 * @param PropFind $propFind
+	 * @param \Sabre\DAV\INode $node
+	 */
+	public function handleGetProperties(
+		PropFind $propFind,
+		\Sabre\DAV\INode $node
+	) {
+		if (!($node instanceof SystemTagNode)) {
+			return;
+		}
+
+		$propFind->handle(self::ID_PROPERTYNAME, function() use ($node) {
+			return $node->getSystemTag()->getId();
+		});
+
+		$propFind->handle(self::DISPLAYNAME_PROPERTYNAME, function() use ($node) {
+			return $node->getSystemTag()->getName();
+		});
+
+		$propFind->handle(self::USERVISIBLE_PROPERTYNAME, function() use ($node) {
+			return (int)$node->getSystemTag()->isUserVisible();
+		});
+
+		$propFind->handle(self::USERASSIGNABLE_PROPERTYNAME, function() use ($node) {
+			return (int)$node->getSystemTag()->isUserAssignable();
+		});
+	}
+
+	/**
+	 * Updates tag attributes
+	 *
+	 * @param string $path
+	 * @param PropPatch $propPatch
+	 *
+	 * @return void
+	 */
+	public function handleUpdateProperties($path, PropPatch $propPatch) {
+		$propPatch->handle([
+			self::DISPLAYNAME_PROPERTYNAME,
+			self::USERVISIBLE_PROPERTYNAME,
+			self::USERASSIGNABLE_PROPERTYNAME,
+		], function($props) use ($path) {
+			$node = $this->tree->getNodeForPath($path);
+			if (!($node instanceof SystemTagNode)) {
+				return;
+			}
+
+			$tag = $node->getTag();
+			$name = $tag->getName();
+			$userVisible = $tag->getUserVisible();
+			$userAssignable = $tag->getUserAssignable();
+
+			if (isset($props[self::DISPLAYNAME_PROPERTYNAME])) {
+				$name = $props[self::DISPLAYNAME_PROPERTYNAME];
+			}
+
+			if (isset($props[self::USERVISIBLE_PROPERTYNAME])) {
+				$userVisible = (bool)$props[self::USERVISIBLE_PROPERTYNAME];
+			}
+
+			if (isset($props[self::USERASSIGNABLE_PROPERTYNAME])) {
+				$userAssignable = (bool)$props[self::USERASSIGNABLE_PROPERTYNAME];
+			}
+
+			$node->update($name, $userVisible, $userAssignable);
+			return true;
+		});
+	}
+}
diff --git a/apps/dav/lib/systemtag/systemtagsbyidcollection.php b/apps/dav/lib/systemtag/systemtagsbyidcollection.php
new file mode 100644
index 00000000000..8643ffedd47
--- /dev/null
+++ b/apps/dav/lib/systemtag/systemtagsbyidcollection.php
@@ -0,0 +1,119 @@
+<?php
+/**
+ * @author Vincent Petry <pvince81@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @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\SystemTag;
+
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAV\Exception\NotFound;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\DAV\ICollection;
+
+use OCP\SystemTag\ISystemTagManager;
+use OCP\SystemTag\ISystemTag;
+use OCP\SystemTag\TagNotFoundException;
+use OC\SystemTag\SystemTag;
+
+class SystemTagsByIdCollection implements ICollection {
+
+	/**
+	 * @var ISystemTagManager
+	 */
+	private $tagManager;
+
+	/**
+	 * SystemTagsByIdCollection constructor.
+	 *
+	 * @param ISystemTagManager $tagManager
+	 */
+	public function __construct($tagManager) {
+		$this->tagManager = $tagManager;
+	}
+
+	function createFile($name, $data = null) {
+		throw new Forbidden('Cannot create tags by id');
+	}
+
+	function createDirectory($name) {
+		throw new Forbidden('Permission denied to create collections');
+	}
+
+	function getChild($name) {
+		try {
+			$tags = $this->tagManager->getTagsById($name);
+			return $this->makeNode(current($tags));
+		} catch (\InvalidArgumentException $e) {
+			throw new BadRequest('Invalid tag id', 0, $e);
+		} catch (TagNotFoundException $e) {
+			throw new NotFound('Tag with id ' . $name . ' not found', 0, $e);
+		}
+	}
+
+	function getChildren() {
+		// TODO: set visibility filter based on principal/permissions ?
+		$tags = $this->tagManager->getAllTags(true);
+		return array_map(function($tag) {
+			return $this->makeNode($tag);
+		}, $tags);
+	}
+
+	function childExists($name) {
+		try {
+			$this->tagManager->getTagsById($name);
+			return true;
+		} catch (\InvalidArgumentException $e) {
+			throw new BadRequest('Invalid tag id', 0, $e);
+		} catch (TagNotFoundException $e) {
+			return false;
+		}
+	}
+
+	function delete() {
+		throw new Forbidden('Permission denied to delete this collection');
+	}
+
+	function getName() {
+		return 'systemtags';
+	}
+
+	function setName($name) {
+		throw new Forbidden('Permission denied to rename this collection');
+	}
+
+	/**
+	 * Returns the last modification time, as a unix timestamp
+	 *
+	 * @return int
+	 */
+	function getLastModified() {
+		return null;
+	}
+
+	/**
+	 * Create a sabre node for the given system tag
+	 *
+	 * @param ISystemTag $tag
+	 *
+	 * @return SystemTagNode
+	 */
+	private function makeNode(ISystemTag $tag) {
+		return new SystemTagNode($tag, $this->tagManager);
+	}
+}
diff --git a/apps/dav/lib/systemtag/systemtagsobjectmappingcollection.php b/apps/dav/lib/systemtag/systemtagsobjectmappingcollection.php
new file mode 100644
index 00000000000..a0a71306f9e
--- /dev/null
+++ b/apps/dav/lib/systemtag/systemtagsobjectmappingcollection.php
@@ -0,0 +1,160 @@
+<?php
+/**
+ * @author Vincent Petry <pvince81@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @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\SystemTag;
+
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAV\Exception\NotFound;
+use Sabre\DAV\Exception\MethodNotAllowed;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\DAV\ICollection;
+
+use OCP\SystemTag\ISystemTagManager;
+use OCP\SystemTag\ISystemTagObjectMapper;
+use OCP\SystemTag\ISystemTag;
+use OCP\SystemTag\TagNotFoundException;
+use OC\SystemTag\SystemTag;
+
+/**
+ * Collection containing tags by object id
+ */
+class SystemTagsObjectMappingCollection implements ICollection {
+
+	/**
+	 * @var string
+	 */
+	private $objectId;
+
+	/**
+	 * @var string
+	 */
+	private $objectType;
+
+	/**
+	 * @var ISystemTagManager
+	 */
+	private $tagManager;
+
+	/**
+	 * @var ISystemTagObjectMapper
+	 */
+	private $tagMapper;
+
+	/**
+	 * Constructor
+	 *
+	 * @param string $objectId object id
+	 * @param string $objectType object type
+	 * @param ISystemTagManager $tagManager
+	 * @param ISystemTagObjectMapper $tagMapper
+	 */
+	public function __construct($objectId, $objectType, $tagManager, $tagMapper) {
+		$this->tagManager = $tagManager;
+		$this->tagMapper = $tagMapper;
+		$this->objectId = $objectId;
+		$this->objectType = $objectType;
+	}
+
+	function createFile($tagId, $data = null) {
+		try {
+			$this->tagMapper->assignTags($this->objectId, $this->objectType, $tagId);
+		} catch (TagNotFoundException $e) {
+			throw new Forbidden('Tag with id ' . $tagId . ' does not exist, cannot assign');
+		}
+	}
+
+	function createDirectory($name) {
+		throw new Forbidden('Permission denied to create collections');
+	}
+
+	function getChild($tagId) {
+		try {
+			if ($this->tagMapper->haveTag($this->objectId, $this->objectType, $tagId, true)) {
+				$tag = $this->tagManager->getTagsById($tagId);
+				return $this->makeNode(current($tag));
+			}
+			throw new NotFound('Tag with id ' . $tagId . ' not present for object ' . $this->objectId);
+		} catch (\InvalidArgumentException $e) {
+			throw new BadRequest('Invalid tag id', 0, $e);
+		} catch (TagNotFoundException $e) {
+			throw new NotFound('Tag with id ' . $tagId . ' not found', 0, $e);
+		}
+	}
+
+	function getChildren() {
+		$tagIds = current($this->tagMapper->getTagIdsForObjects($this->objectId, $this->objectType));
+		if (empty($tagIds)) {
+			return [];
+		}
+		$tags = $this->tagManager->getTagsById($tagIds);
+		return array_map(function($tag) {
+			return $this->makeNode($tag);
+		}, $tags);
+	}
+
+	function childExists($tagId) {
+		try {
+			return ($this->tagMapper->haveTag($this->objectId, $this->objectType, $tagId, true));
+		} catch (\InvalidArgumentException $e) {
+			throw new BadRequest('Invalid tag id', 0, $e);
+		} catch (TagNotFoundException $e) {
+			throw new NotFound('Tag with id ' . $tagId . ' not found', 0, $e);
+		}
+	}
+
+	function delete() {
+		throw new Forbidden('Permission denied to delete this collection');
+	}
+
+	function getName() {
+		return $this->objectId;
+	}
+
+	function setName($name) {
+		throw new Forbidden('Permission denied to rename this collection');
+	}
+
+	/**
+	 * Returns the last modification time, as a unix timestamp
+	 *
+	 * @return int
+	 */
+	function getLastModified() {
+		return null;
+	}
+
+	/**
+	 * Create a sabre node for the given system tag
+	 *
+	 * @param ISystemTag $tag
+	 *
+	 * @return SystemTagNode
+	 */
+	private function makeNode(ISystemTag $tag) {
+		return new SystemTagMappingNode(
+			$tag,
+			$this->objectId,
+			$this->objectType,
+			$this->tagManager,
+			$this->tagMapper
+		);
+	}
+}
diff --git a/apps/dav/lib/systemtag/systemtagsobjecttypecollection.php b/apps/dav/lib/systemtag/systemtagsobjecttypecollection.php
new file mode 100644
index 00000000000..c90e4fd2d8d
--- /dev/null
+++ b/apps/dav/lib/systemtag/systemtagsobjecttypecollection.php
@@ -0,0 +1,114 @@
+<?php
+/**
+ * @author Vincent Petry <pvince81@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @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\SystemTag;
+
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAV\Exception\NotFound;
+use Sabre\DAV\Exception\MethodNotAllowed;
+use Sabre\DAV\ICollection;
+
+use OCP\SystemTag\ISystemTagManager;
+use OCP\SystemTag\ISystemTagObjectMapper;
+use OCP\SystemTag\ISystemTag;
+use OCP\SystemTag\TagNotFoundException;
+use OC\SystemTag\SystemTag;
+
+/**
+ * Collection containing object ids by object type
+ */
+class SystemTagsObjectTypeCollection implements ICollection {
+
+	/**
+	 * @var string
+	 */
+	private $objectType;
+
+	/**
+	 * @var ISystemTagManager
+	 */
+	private $tagManager;
+
+	/**
+	 * @var ISystemTagObjectMapper
+	 */
+	private $tagMapper;
+
+	/**
+	 * Constructor
+	 *
+	 * @param string $objectType object type
+	 * @param ISystemTagManager $tagManager
+	 * @param ISystemTagObjectMapper $tagMapper
+	 */
+	public function __construct($objectType, $tagManager, $tagMapper) {
+		$this->tagManager = $tagManager;
+		$this->tagMapper = $tagMapper;
+		$this->objectType = $objectType;
+	}
+
+	function createFile($name, $data = null) {
+		throw new Forbidden('Permission denied to create collections');
+	}
+
+	function createDirectory($name) {
+		throw new Forbidden('Permission denied to create collections');
+	}
+
+	function getChild($objectId) {
+		return new SystemTagsObjectMappingCollection(
+			$objectId,
+			$this->objectType,
+			$this->tagManager,
+			$this->tagMapper
+		);
+	}
+
+	function getChildren() {
+		// do not list object ids
+		throw new MethodNotAllowed();
+	}
+
+	function childExists($name) {
+		return true;
+	}
+
+	function delete() {
+		throw new Forbidden('Permission denied to delete this collection');
+	}
+
+	function getName() {
+		return $this->objectType;
+	}
+
+	function setName($name) {
+		throw new Forbidden('Permission denied to rename this collection');
+	}
+
+	/**
+	 * Returns the last modification time, as a unix timestamp
+	 *
+	 * @return int
+	 */
+	function getLastModified() {
+		return null;
+	}
+}
diff --git a/apps/dav/lib/systemtag/systemtagsrelationscollection.php b/apps/dav/lib/systemtag/systemtagsrelationscollection.php
new file mode 100644
index 00000000000..4bcb6882a4b
--- /dev/null
+++ b/apps/dav/lib/systemtag/systemtagsrelationscollection.php
@@ -0,0 +1,50 @@
+<?php
+/**
+ * @author Vincent Petry <pvince81@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @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\SystemTag;
+
+use Sabre\DAV\SimpleCollection;
+
+class SystemTagsRelationsCollection extends SimpleCollection {
+
+	/**
+	 * SystemTagsRelationsCollection constructor.
+	 *
+	 * @param ISystemTagManager $tagManager
+	 * @param ISystemTagObjectMapper $tagMapper
+	 */
+	public function __construct($tagManager, $tagMapper) {
+		$children = [
+			new SystemTagsObjectTypeCollection('files', $tagManager, $tagMapper),
+		];
+
+		parent::__construct('root', $children);
+	}
+
+	function getName() {
+		return 'systemtags-relations';
+	}
+
+	function setName($name) {
+		throw new Forbidden('Permission denied to rename this collection');
+	}
+
+}