From f1108b9d26f12e8a371185a5dc07c4d38b2dd824 Mon Sep 17 00:00:00 2001
From: Georg Ehrke <developer@georgehrke.com>
Date: Fri, 25 May 2018 20:26:36 +0200
Subject: [PATCH] send invitations for shared calendars

Signed-off-by: Georg Ehrke <developer@georgehrke.com>
---
 apps/dav/lib/CalDAV/Schedule/Plugin.php | 67 +++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/apps/dav/lib/CalDAV/Schedule/Plugin.php b/apps/dav/lib/CalDAV/Schedule/Plugin.php
index 34df666637..faf495a4de 100644
--- a/apps/dav/lib/CalDAV/Schedule/Plugin.php
+++ b/apps/dav/lib/CalDAV/Schedule/Plugin.php
@@ -31,6 +31,10 @@ use Sabre\DAV\PropFind;
 use Sabre\DAV\Server;
 use Sabre\DAV\Xml\Property\LocalHref;
 use Sabre\DAVACL\IPrincipal;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+use Sabre\VObject\Component\VCalendar;
+use Sabre\VObject\Reader;
 
 class Plugin extends \Sabre\CalDAV\Schedule\Plugin {
 
@@ -98,4 +102,67 @@ class Plugin extends \Sabre\CalDAV\Schedule\Plugin {
 			});
 		}
 	}
+
+	/**
+	 * This method is triggered whenever there was a calendar object gets
+	 * created or updated.
+	 *
+	 * Basically just a copy of parent::calendarObjectChange, with the change
+	 * from:
+	 * $addresses = $this->getAddressesForPrincipal($calendarNode->getOwner());
+	 * to:
+	 * $addresses = $this->getAddressesForPrincipal($calendarNode->getPrincipalURI());
+	 *
+	 * @param RequestInterface $request HTTP request
+	 * @param ResponseInterface $response HTTP Response
+	 * @param VCalendar $vCal Parsed iCalendar object
+	 * @param mixed $calendarPath Path to calendar collection
+	 * @param mixed $modified The iCalendar object has been touched.
+	 * @param mixed $isNew Whether this was a new item or we're updating one
+	 * @return void
+	 */
+	function calendarObjectChange(RequestInterface $request, ResponseInterface $response, VCalendar $vCal, $calendarPath, &$modified, $isNew) {
+
+		if (!$this->scheduleReply($this->server->httpRequest)) {
+			return;
+		}
+
+		$calendarNode = $this->server->tree->getNodeForPath($calendarPath);
+
+		$addresses = $this->getAddressesForPrincipal(
+			$calendarNode->getPrincipalURI()
+		);
+
+		if (!$isNew) {
+			$node = $this->server->tree->getNodeForPath($request->getPath());
+			$oldObj = Reader::read($node->get());
+		} else {
+			$oldObj = null;
+		}
+
+		$this->processICalendarChange($oldObj, $vCal, $addresses, [], $modified);
+
+		if ($oldObj) {
+			// Destroy circular references so PHP will GC the object.
+			$oldObj->destroy();
+		}
+
+	}
+
+	/**
+	 * This method checks the 'Schedule-Reply' header
+	 * and returns false if it's 'F', otherwise true.
+	 *
+	 * Copied from Sabre/DAV's Schedule plugin, because it's
+	 * private for whatever reason
+	 *
+	 * @param RequestInterface $request
+	 * @return bool
+	 */
+	private function scheduleReply(RequestInterface $request) {
+
+		$scheduleReply = $request->getHeader('Schedule-Reply');
+		return $scheduleReply !== 'F';
+
+	}
 }