1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
<?php
declare(strict_types=1);
/**
* @copyright 2022 Anna Larch <anna.larch@gmx.net>
*
* @author 2022 Anna Larch <anna.larch@gmx.net>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\DAV\CalDAV;
use OCA\DAV\AppInfo\Application;
use OCA\DAV\CalDAV\Schedule\IMipService;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IConfig;
use Sabre\VObject\Component\VCalendar;
use Sabre\VObject\Component\VEvent;
use Sabre\VObject\Component\VTimeZone;
use Sabre\VObject\Component\VTodo;
use function max;
class EventComparisonService {
/** @var string[] */
private const EVENT_DIFF = [
'RECURRENCE-ID',
'RRULE',
'SEQUENCE',
'LAST-MODIFIED'
];
/**
* If found, remove the event from $eventsToFilter that
* is identical to the passed $filterEvent
* and return whether an identical event was found
*
* This function takes into account the SEQUENCE,
* RRULE, RECURRENCE-ID and LAST-MODIFIED parameters
*
* @param VEvent $filterEvent
* @param array $eventsToFilter
* @return bool true if there was an identical event found and removed, false if there wasn't
*/
private function removeIfUnchanged(VEvent $filterEvent, array &$eventsToFilter): bool {
$filterEventData = [];
foreach(self::EVENT_DIFF as $eventDiff) {
$filterEventData[] = IMipService::readPropertyWithDefault($filterEvent, $eventDiff, '');
}
/** @var VEvent $component */
foreach ($eventsToFilter as $k => $eventToFilter) {
$eventToFilterData = [];
foreach(self::EVENT_DIFF as $eventDiff) {
$eventToFilterData[] = IMipService::readPropertyWithDefault($eventToFilter, $eventDiff, '');
}
// events are identical and can be removed
if (empty(array_diff($filterEventData, $eventToFilterData))) {
unset($eventsToFilter[$k]);
return true;
}
}
return false;
}
/**
* Compare two VCalendars with each other and find all changed elements
*
* Returns an array of old and new events
*
* Old events are only detected if they are also changed
* If there is no corresponding old event for a VEvent, it
* has been newly created
*
* @param VCalendar $new
* @param VCalendar|null $old
* @return array<string, VEvent[]|null>
*/
public function findModified(VCalendar $new, ?VCalendar $old): array {
$newEventComponents = $new->getComponents();
foreach ($newEventComponents as $k => $event) {
if(!$event instanceof VEvent) {
unset($newEventComponents[$k]);
}
}
if(empty($old)) {
return ['old' => null, 'new' => $newEventComponents];
}
$oldEventComponents = $old->getComponents();
if(is_array($oldEventComponents) && !empty($oldEventComponents)) {
foreach ($oldEventComponents as $k => $event) {
if(!$event instanceof VEvent) {
unset($oldEventComponents[$k]);
continue;
}
if($this->removeIfUnchanged($event, $newEventComponents)) {
unset($oldEventComponents[$k]);
}
}
}
return ['old' => array_values($oldEventComponents), 'new' => array_values($newEventComponents)];
}
}
|
