Simplify edit group checking algorithm

Rather than making a server call, which seems to be not working
always anyways, use a foolproof method for this.

controller/documentcontroller.php

@@ -292,16 +292,22 @@ class DocumentController extends Controller {
 			return $this->responseError($this->l10n->t('Collabora Online: Invalid URL "%s".', array($wopiRemote)), $this->l10n->t('Please ask your administrator to check the Collabora Online server setting.'));
 		}
 
+		$user = \OC::$server->getUserSession()->getUser();
+		$usergroups = array_filter(\OC::$server->getGroupManager()->getUserGroupIds($user));
+		$usergroups = join('|', $usergroups);
+		\OC::$server->getLogger()->debug('User is in groups: {groups}', [ 'app' => $this->appName, 'groups' => $usergroups ]);
+
 		\OC::$server->getNavigationManager()->setActiveEntry( 'richdocuments_index' );
 		$maxUploadFilesize = \OCP\Util::maxUploadFilesize("/");
 		$response = new TemplateResponse('richdocuments', 'documents', [
-			'enable_previews' => 		$this->settings->getSystemValue('enable_previews', true),
+			'enable_previews' =>		$this->settings->getSystemValue('enable_previews', true),
 			'uploadMaxFilesize' =>		$maxUploadFilesize,
 			'uploadMaxHumanFilesize' =>	\OCP\Util::humanFileSize($maxUploadFilesize),
-			'allowShareWithLink' => 	$this->settings->getAppValue('core', 'shareapi_allow_links', 'yes'),
+			'allowShareWithLink' =>		$this->settings->getAppValue('core', 'shareapi_allow_links', 'yes'),
 			'wopi_url' =>			$webSocket,
 			'edit_groups' =>		$this->appConfig->getAppValue('edit_groups'),
-			'doc_format' =>			$this->appConfig->getAppValue('doc_format')
+			'doc_format' =>			$this->appConfig->getAppValue('doc_format'),
+			'usergroups' =>			$usergroups
 		]);
 
 		$policy = new ContentSecurityPolicy();

js/documents.js

@@ -19,27 +19,17 @@ $.widget('oc.documentGrid', {
 				that._render();
 
 				if (!documentsMain.isGuest) {
-					$.ajax({
-						url: OC.generateUrl('/settings/users/users'),
-						type: 'get',
-						data: { limit: 1, pattern: OC.currentUser },
-						async: false,
-						success: function(result) {
-							var editGroups = $('#edit_groups').val();
-							documentsMain.canEdit = (editGroups === '');
-							if (!documentsMain.canEdit && result.length >= 1) {
-								for (var idx in result[0].groups) {
-									if (editGroups.indexOf(result[0].groups[idx]) !== -1) {
-										documentsMain.canEdit = true;
-										break;
-									}
-								}
+					var editGroups = $('#edit_groups').val().split('|');
+					var usergroups = $('#usergroups').val().split('|');
+					documentsMain.canEdit = (editGroups.length === 0);
+					if (!documentsMain.canEdit && usergroups.length >= 1) {
+						for (var idx in usergroups) {
+							if (editGroups.indexOf(usergroups[idx]) !== -1) {
+								documentsMain.canEdit = true;
+								break;
 							}
-						},
-						error: function() {
-							console.log('Error fetching information about current user.');
 						}
-					});
+					}
 				}
 
 				documentsMain.renderComplete = true;

templates/documents.php

@@ -53,3 +53,4 @@ script('files', 'jquery.fileupload');
 <?php endif; ?>
 <input type="hidden" name="allowShareWithLink" id="allowShareWithLink" value="<?php p($_['allowShareWithLink']) ?>" />
 <input type="hidden" name="edit_groups" id="edit_groups" value="<?php p($_['edit_groups']) ?>" />
+<input type="hidden" name="usergroups" id="usergroups" value="<?php p($_['usergroups']) ?>" />