Created infrastructure to show circles' shared files

There is a proposal to allow users to filter files shared to circles. This commit is needed to provide the infrastucture for it.

Issue: nextcloud/circles#137

Signed-off-by: Vinicius Cubas Brand <viniciuscb@gmail.com>

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

@@ -46,6 +46,7 @@ class FilesReportPlugin extends ServerPlugin {
 	const NS_OWNCLOUD = 'http://owncloud.org/ns';
 	const REPORT_NAME            = '{http://owncloud.org/ns}filter-files';
 	const SYSTEMTAG_PROPERTYNAME = '{http://owncloud.org/ns}systemtag';
+	const CIRCLE_PROPERTYNAME = '{http://owncloud.org/ns}circle';
 
 	/**
 	 * Reference to main server object
@@ -256,14 +257,19 @@ protected function processFilterRules($filterRules) {
 		$ns = '{' . $this::NS_OWNCLOUD . '}';
 		$resultFileIds = null;
 		$systemTagIds = [];
+		$circlesIds = [];
 		$favoriteFilter = null;
 		foreach ($filterRules as $filterRule) {
 			if ($filterRule['name'] === $ns . 'systemtag') {
 				$systemTagIds[] = $filterRule['value'];
 			}
+			if ($filterRule['name'] === $ns . 'circle') {
+				$circlesIds[] = $filterRule['value'];
+			}
 			if ($filterRule['name'] === $ns . 'favorite') {
 				$favoriteFilter = true;
 			}
+
 		}
 
 		if ($favoriteFilter !== null) {
@@ -282,6 +288,15 @@ protected function processFilterRules($filterRules) {
 			}
 		}
 
+		if (!empty($circlesIds)) {
+			$fileIds = $this->getCirclesFileIds($circlesIds);
+			if (empty($resultFileIds)) {
+				$resultFileIds = $fileIds;
+			} else {
+				$resultFileIds = array_intersect($fileIds, $resultFileIds);
+			}
+		}
+
 		return $resultFileIds;
 	}
 
@@ -328,6 +343,29 @@ private function getSystemTagFileIds($systemTagIds) {
 		return $resultFileIds;
 	}
 
+	private function getCirclesFileIds($circlesIds) {
+
+		// check user permissions, if applicable
+		/*
+		if (!$this->isAdmin()) {
+			// check visibility/permission
+			$tags = $this->tagManager->getTagsByIds($circlesIds);
+			$unknownTagIds = [];
+			foreach ($tags as $tag) {
+				if (!$tag->isUserVisible()) {
+					$unknownTagIds[] = $tag->getId();
+				}
+			}
+
+			if (!empty($unknownTagIds)) {
+				throw new TagNotFoundException('Tag with ids ' . implode(', ', $unknownTagIds) . ' not found');
+			}
+		}
+		*/
+
+		return \OCA\Circles\Api\v1\Circles::getObjectIdsForCircles($circlesIds);
+	}
+
 	/**
 	 * Prepare propfind response for the given nodes
 	 *

core/js/files/client.js

@@ -503,7 +503,7 @@
 
 		/**
 		 * Fetches a flat list of files filtered by a given filter criteria.
-		 * (currently only system tags is supported)
+		 * (currently system tags and circles are supported)
 		 *
 		 * @param {Object} filter filter criteria
 		 * @param {Object} [filter.systemTagIds] list of system tag ids to filter by
@@ -525,7 +525,8 @@
 				properties = options.properties;
 			}
 
-			if (!filter || (!filter.systemTagIds && _.isUndefined(filter.favorite))) {
+			if (!filter ||
+				(!filter.systemTagIds && _.isUndefined(filter.favorite) && !filter.circlesIds) ) {
 				throw 'Missing filter argument';
 			}
 
@@ -551,6 +552,9 @@
 			_.each(filter.systemTagIds, function(systemTagIds) {
 				body += '        <oc:systemtag>' + escapeHTML(systemTagIds) + '</oc:systemtag>\n';
 			});
+			_.each(filter.circlesIds, function(circlesIds) {
+				body += '        <oc:circle>' + escapeHTML(circlesIds) + '</oc:circle>\n';
+			});
 			if (filter.favorite) {
 				body += '        <oc:favorite>' + (filter.favorite ? '1': '0') + '</oc:favorite>\n';
 			}