improve remote.php and create public.php

apps/calendar/appinfo/app.php

   'name' => $l->t('Calendar')));
 OCP\App::registerPersonal('calendar', 'settings');
 OC_Search::registerProvider('OC_Search_Provider_Calendar');
-OCP\CONFIG::setAppValue('core', 'caldav', '/apps/calendar/appinfo/remote.php');
+OCP\CONFIG::setAppValue('core', 'remote_caldav', '/apps/calendar/appinfo/remote.php');
+OCP\CONFIG::setAppValue('core', 'public_calendar', '/apps/calendar/appinfo/share.php');

apps/contacts/appinfo/app.php

 OCP\App::registerPersonal('contacts','settings');
 OCP\Util::addscript('contacts', 'loader');
 OC_Search::registerProvider('OC_Search_Provider_Contacts');
-OCP\CONFIG::setAppValue('core', 'carddav', '/apps/contacts/appinfo/remote.php');
+OCP\CONFIG::setAppValue('core', 'remote_carddav', '/apps/contacts/appinfo/remote.php');

apps/files/appinfo/app.php

 OCP\App::addNavigationEntry( array( "id" => "files_index", "order" => 0, "href" => OCP\Util::linkTo( "files", "index.php" ), "icon" => OCP\Util::imagePath( "core", "places/home.svg" ), "name" => $l->t("Files") ));
 
 OC_Search::registerProvider('OC_Search_Provider_File');
-OCP\CONFIG::setAppValue('core', 'webdav', '/apps/files/appinfo/remote.php');
+OCP\CONFIG::setAppValue('core', 'remote_webdav', '/apps/files/appinfo/remote.php');

apps/files_sharing/appinfo/app.php

 OCP\Util::addscript("3rdparty", "chosen/chosen.jquery.min");
 OCP\Util::addStyle( 'files_sharing', 'sharing' );
 OCP\Util::addStyle("3rdparty", "chosen/chosen");
-
+OCP\CONFIG::setAppValue('core', 'public_files', '/apps/files_sharing/get.php');
 ?>

apps/files_sharing/js/share.js

 	},
 	showPrivateLink:function(item, token) {
 		$('#privateLinkCheckbox').attr('checked', true);
-		var link = parent.location.protocol+'//'+location.host+OC.linkTo('files_sharing','get.php')+'?token='+token;
+		var link = parent.location.protocol+'//'+location.host+OC.linkTo('', 'public.php')+'?service=files&token='+token;
 		if (token.indexOf('&path=') == -1) {
 			link += '&file=' + item;
 		} else {

core/js/js.js

 	webroot:oc_webroot,
 	appswebroot:oc_appswebroot,
 	currentUser:(typeof oc_current_user!=='undefined')?oc_current_user:false,
-	coreApps:['admin','log','search','settings','core','3rdparty'],
+	coreApps:['', 'admin','log','search','settings','core','3rdparty'],
 	/**
 	 * get an absolute url to a file in an appen
 	 * @param app the id of the app the file belongs to

public.php

+<?php
+$RUNTIME_NOSETUPFS = true;
+//$RUNTIME_NOAPPS = TRUE;
+require_once('lib/base.php');
+$file = OCP\CONFIG::getAppValue('core', 'public_' . strip_tags($_GET['service']));
+if(is_null($file)){
+	header('HTTP/1.0 404 Not Found');
+	exit;
+}
+require_once(OC::$APPSROOT . $file);

remote.php

 	$pos = strlen($path_info);
 }
 $service=substr($path_info, 1, $pos-1);
-$file = OCP\CONFIG::getAppValue('core', $service);
+$file = OCP\CONFIG::getAppValue('core', 'remote_' . $service);
 if(is_null($file)){
-	//header('HTTP/1.0 404 Not Found');
+	header('HTTP/1.0 404 Not Found');
 	exit;
 }
 $baseuri = OC::$WEBROOT . '/remote.php/'.$service.'/';
-require_once(OC::$APPSROOT . $file);
+require_once(OC::$APPSROOT . $file);