diff --git a/core/Controller/CollaborationResourcesController.php b/core/Controller/CollaborationResourcesController.php
new file mode 100644
index 0000000000000000000000000000000000000000..b56d67d84548afa4411ede8c1537ae473b8f5405
--- /dev/null
+++ b/core/Controller/CollaborationResourcesController.php
@@ -0,0 +1,163 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2018 Joas Schilling <coding@schilljs.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Core\Controller;
+
+use OCP\AppFramework\Http;
+use OCP\AppFramework\OCSController;
+use OCP\AppFramework\Http\DataResponse;
+use OCP\Collaboration\Resources\CollectionException;
+use OCP\Collaboration\Resources\ICollection;
+use OCP\Collaboration\Resources\IManager;
+use OCP\Collaboration\Resources\IResource;
+use OCP\Collaboration\Resources\ResourceException;
+use OCP\IRequest;
+
+class CollaborationResourcesController extends OCSController {
+	/** @var IManager */
+	private $manager;
+
+	public function __construct(
+		$appName,
+		IRequest $request,
+		IManager $manager
+	) {
+		parent::__construct($appName, $request);
+
+		$this->manager = $manager;
+	}
+
+	/**
+	 * @param int $collectionId
+	 * @return ICollection
+	 * @throws CollectionException when the collection was not found for the user
+	 */
+	protected function getCollection(int $collectionId): ICollection {
+		$collection = $this->manager->getCollection($collectionId);
+
+		if (false) { // TODO auth checking
+			throw new CollectionException('Not found');
+		}
+
+		return $collection;
+	}
+
+	/**
+	 * @NoAdminRequired
+	 *
+	 * @param int $collectionId
+	 * @return DataResponse
+	 */
+	public function listCollection(int $collectionId): DataResponse {
+		try {
+			$collection = $this->getCollection($collectionId);
+		} catch (CollectionException $e) {
+			return new DataResponse([], Http::STATUS_NOT_FOUND);
+		}
+
+		return new DataResponse($this->prepareCollection($collection));
+	}
+
+	/**
+	 * @NoAdminRequired
+	 *
+	 * @param int $collectionId
+	 * @param string $resourceType
+	 * @param string $resourceId
+	 * @return DataResponse
+	 */
+	public function addResource(int $collectionId, string $resourceType, string $resourceId): DataResponse {
+		try {
+			$collection = $this->getCollection($collectionId);
+		} catch (CollectionException $e) {
+			return new DataResponse([], Http::STATUS_NOT_FOUND);
+		}
+
+		try {
+			$resource = $this->manager->getResource($resourceType, $resourceId);
+		} catch (ResourceException $e) {
+			return new DataResponse([], Http::STATUS_NOT_FOUND);
+		}
+
+		try {
+			$collection->addResource($resource);
+		} catch (ResourceException $e) {
+		}
+
+		return new DataResponse($this->prepareCollection($collection));
+	}
+
+	/**
+	 * @NoAdminRequired
+	 *
+	 * @param int $collectionId
+	 * @param string $resourceType
+	 * @param string $resourceId
+	 * @return DataResponse
+	 */
+	public function removeResource(int $collectionId, string $resourceType, string $resourceId): DataResponse {
+		try {
+			$collection = $this->getCollection($collectionId);
+		} catch (CollectionException $e) {
+			return new DataResponse([], Http::STATUS_NOT_FOUND);
+		}
+
+		try {
+			$resource = $this->manager->getResource($resourceType, $resourceId);
+		} catch (CollectionException $e) {
+			return new DataResponse([], Http::STATUS_NOT_FOUND);
+		}
+
+		$collection->removeResource($resource);
+
+		return new DataResponse($this->prepareCollection($collection));
+	}
+
+	/**
+	 * @NoAdminRequired
+	 *
+	 * @param string $resourceType
+	 * @param string $resourceId
+	 * @return DataResponse
+	 */
+	public function getCollectionsByResource(string $resourceType, string $resourceId): DataResponse {
+		try {
+			// TODO auth checking
+			$resource = $this->manager->getResource($resourceType, $resourceId);
+		} catch (CollectionException $e) {
+			return new DataResponse([], Http::STATUS_NOT_FOUND);
+		}
+
+		return new DataResponse(array_map([$this, 'prepareCollection'], $resource->getCollections()));
+	}
+
+	protected function prepareCollection(ICollection $collection): array {
+		return array_map([$this, 'prepareResources'], $collection->getResources());
+	}
+
+	protected function prepareResources(IResource $resource): array {
+		return [
+			'type' => $resource->getType(),
+			'id' => $resource->getId()
+		];
+	}
+}
diff --git a/core/routes.php b/core/routes.php
index d79fea1ca21e79cef3762e681a6badebee3d1820..7fcd576d322d46d1a5a163b8da48453cc401c93c 100644
--- a/core/routes.php
+++ b/core/routes.php
@@ -90,6 +90,11 @@ $application->registerRoutes($this, [
 		['root' => '/core', 'name' => 'WhatsNew#get', 'url' => '/whatsnew', 'verb' => 'GET'],
 		['root' => '/core', 'name' => 'WhatsNew#dismiss', 'url' => '/whatsnew', 'verb' => 'POST'],
 		['root' => '/core', 'name' => 'AppPassword#getAppPassword', 'url' => '/getapppassword', 'verb' => 'GET'],
+
+		['root' => '/collaboration', 'name' => 'CollaborationResources#listCollection', 'url' => '/resources/collections/{collectionId}', 'verb' => 'GET'],
+		['root' => '/collaboration', 'name' => 'CollaborationResources#addResource', 'url' => '/resources/collections/{collectionId}', 'verb' => 'POST'],
+		['root' => '/collaboration', 'name' => 'CollaborationResources#removeResource', 'url' => '/resources/collections/{collectionId}', 'verb' => 'DELETE'],
+		['root' => '/collaboration', 'name' => 'CollaborationResources#getCollectionsByResource', 'url' => '/resources/{resourceType}/{resourceId}', 'verb' => 'GET'],
 	],
 ]);
 
diff --git a/lib/private/Collaboration/Resources/Resource.php b/lib/private/Collaboration/Resources/Resource.php
index f82ceff5596dc715d86f1a982a29626d45e1b8e8..0eda8ba55c20ac91e927634b212084b07807afb9 100644
--- a/lib/private/Collaboration/Resources/Resource.php
+++ b/lib/private/Collaboration/Resources/Resource.php
@@ -66,19 +66,18 @@ class Resource implements IResource {
 	}
 
 	/**
-	 * @param IResource $resource
 	 * @return ICollection[]
 	 * @since 15.0.0
 	 */
-	public function getCollections(IResource $resource): array {
+	public function getCollections(): array {
 		$collections = [];
 
 		$query = $this->connection->getQueryBuilder();
 
 		$query->select('collection_id')
 			->from('collres_resources')
-			->where($query->expr()->eq('resource_type', $query->createNamedParameter($resource->getType())))
-			->andWhere($query->expr()->eq('resource_id', $query->createNamedParameter($resource->getId())));
+			->where($query->expr()->eq('resource_type', $query->createNamedParameter($this->getType())))
+			->andWhere($query->expr()->eq('resource_id', $query->createNamedParameter($this->getId())));
 
 		$result = $query->execute();
 		while ($row = $result->fetch()) {
diff --git a/lib/public/Collaboration/Resources/CollectionException.php b/lib/public/Collaboration/Resources/CollectionException.php
new file mode 100644
index 0000000000000000000000000000000000000000..f5130d37d60aae970f47ea7bd9bbefb42f06533f
--- /dev/null
+++ b/lib/public/Collaboration/Resources/CollectionException.php
@@ -0,0 +1,28 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2018 Joas Schilling <coding@schilljs.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\Collaboration\Resources;
+
+
+class CollectionException extends \RuntimeException {
+
+}
diff --git a/lib/public/Collaboration/Resources/IProvider.php b/lib/public/Collaboration/Resources/IProvider.php
index 06e2a6a81eec9216dffb3e8faa7bb65ea3f861b1..eac92733dea029155986e781c49781605b497fbf 100644
--- a/lib/public/Collaboration/Resources/IProvider.php
+++ b/lib/public/Collaboration/Resources/IProvider.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 /**
  * @copyright Copyright (c) 2018 Joas Schilling <coding@schilljs.com>
  *
diff --git a/lib/public/Collaboration/Resources/IResource.php b/lib/public/Collaboration/Resources/IResource.php
index 42631bc27a82e50ce884da0eabdddadfd3c2a35c..9f8628c0d4816e6c351d8268a13b6fd4d5c0b978 100644
--- a/lib/public/Collaboration/Resources/IResource.php
+++ b/lib/public/Collaboration/Resources/IResource.php
@@ -40,9 +40,8 @@ interface IResource {
 	public function getId(): string;
 
 	/**
-	 * @param IResource $resource
 	 * @return ICollection[]
 	 * @since 15.0.0
 	 */
-	public function getCollections(IResource $resource): array;
+	public function getCollections(): array;
 }
diff --git a/lib/public/Collaboration/Resources/ResourceException.php b/lib/public/Collaboration/Resources/ResourceException.php
index f31b2031a89c9c73a217e5922715ff62350c9160..d03264bcef9d42d8d18fda18d832d83b04accb05 100644
--- a/lib/public/Collaboration/Resources/ResourceException.php
+++ b/lib/public/Collaboration/Resources/ResourceException.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 /**
  * @copyright Copyright (c) 2018 Joas Schilling <coding@schilljs.com>
  *