Support for multiple default apps

If a default app isn't visible for the user, try the next one.
Else fallback to the "files" app.

config/config.sample.php

@@ -74,7 +74,11 @@ $CONFIG = array(
 /* URL to the parent directory of the 3rdparty directory, as seen by the browser */
 "3rdpartyurl" => "",
 
-/* Default app to load on login */
+/* Default app to open on login.
+ * This can be a comma-separated list of app ids.
+ * If the first app is not enabled for the current user,
+ * it will try with the second one and so on. If no enabled app could be found,
+ * the "files" app will be displayed instead. */
 "defaultapp" => "files",
 
 /* Enable the help menu item in the settings */

lib/private/util.php

@@ -827,9 +827,17 @@ class OC_Util {
 			if ($defaultPage) {
 				$location = $urlGenerator->getAbsoluteURL($defaultPage);
 			} else {
-				$defaultApp = \OCP\Config::getSystemValue('defaultapp', 'files');
-				$defaultApp = OC_App::cleanAppId(strip_tags($defaultApp));
-				$location = $urlGenerator->getAbsoluteURL('/index.php/apps/' . $defaultApp);
+				$appId = 'files';
+				$defaultApps = explode(',', \OCP\Config::getSystemValue('defaultapp', 'files'));
+				// find the first app that is enabled for the current user
+				foreach ($defaultApps as $defaultApp) {
+					$defaultApp = OC_App::cleanAppId(strip_tags($defaultApp));
+					if (OC_App::isEnabled($defaultApp)) {
+						$appId = $defaultApp;
+						break;
+					}
+				}
+				$location = $urlGenerator->linkTo($appId, 'index.php');
 			}
 		}
 		OC_Log::write('core', 'redirectToDefaultPage: '.$location, OC_Log::DEBUG);