From 9ac9c693adaa6d3262e1a8639c83474419059730 Mon Sep 17 00:00:00 2001
From: Mario Vavti <mario@mariovavti.com>
Date: Wed, 12 Jun 2019 10:07:18 +0200
Subject: initial support for deleting event items if an event is removed

---
 Zotlabs/Module/Channel_calendar.php | 65 +++++++++++++++++++++++++++++++++++--
 1 file changed, 62 insertions(+), 3 deletions(-)

(limited to 'Zotlabs/Module/Channel_calendar.php')

diff --git a/Zotlabs/Module/Channel_calendar.php b/Zotlabs/Module/Channel_calendar.php
index 4f08eb27c..fcb3ca58b 100644
--- a/Zotlabs/Module/Channel_calendar.php
+++ b/Zotlabs/Module/Channel_calendar.php
@@ -422,13 +422,72 @@ class Channel_calendar extends \Zotlabs\Web\Controller {
 					dbesc($event_id),
 					intval(local_channel())
 				);
+
 				if($r) {
-					$r = q("update item set resource_type = '', resource_id = '' where resource_type = 'event' and resource_id = '%s' and uid = %d",
+
+					$sync_event['event_deleted'] = 1;
+					build_sync_packet(0,array('event' => array($sync_event)));
+
+					$i = q("select * from item where resource_type = 'event' and resource_id = '%s' and uid = %d",
 						dbesc($event_id),
 						intval(local_channel())
 					);
-					$sync_event['event_deleted'] = 1;
-					build_sync_packet(0,array('event' => array($sync_event)));
+
+					if ($i) {
+
+						$can_delete = false;
+						$local_delete = true;
+
+						$ob_hash = get_observer_hash();
+						if($ob_hash && ($ob_hash === $i[0]['author_xchan'] || $ob_hash === $i[0]['owner_xchan'] || $ob_hash === $i[0]['source_xchan'])) {
+							$can_delete = true;
+						}
+
+						// The site admin can delete any post/item on the site.
+						// If the item originated on this site+channel the deletion will propagate downstream. 
+						// Otherwise just the local copy is removed.
+
+						if(is_site_admin()) {
+							$local_delete = true;
+							if(intval($i[0]['item_origin']))
+								$can_delete = true;
+						}
+
+						if($can_delete || $local_delete) {
+
+							q("update item set resource_type = '', resource_id = '' where resource_type = 'event' and resource_id = '%s' and uid = %d",
+								dbesc($event_id),
+								intval(local_channel())
+							);
+	
+							// if this is a different page type or it's just a local delete
+							// but not by the item author or owner, do a simple deletion
+
+							$complex = false;	
+
+							if(intval($i[0]['item_type']) || ($local_delete && (! $can_delete))) {
+								drop_item($i[0]['id']);
+							}
+							else {
+								// complex deletion that needs to propagate and be performed in phases
+								drop_item($i[0]['id'],true,DROPITEM_PHASE1);
+								$complex = true;
+							}
+
+							$ii = q("select * from item where id = %d",
+								intval($i[0]['id'])
+							);
+							if($ii) {
+								xchan_query($ii);
+								$sync_item = fetch_post_tags($ii);
+								build_sync_packet($i[0]['uid'],array('item' => array(encode_item($sync_item[0],true))));
+							}
+
+							if($complex) {
+								tag_deliver($i[0]['uid'],$i[0]['id']);
+							}
+						}
+					}
 					killme();
 				}
 				notice( t('Failed to remove event' ) . EOL);
-- 
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