1 files changed, 87 insertions, 0 deletions
diff --git a/apps/dav/lib/CalDAV/EventReaderRRule.php b/apps/dav/lib/CalDAV/EventReaderRRule.php
new file mode 100644
index 00000000000..d2b4968c479
--- /dev/null
+++ b/apps/dav/lib/CalDAV/EventReaderRRule.php
@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\DAV\CalDAV;
+
+use DateTime;
+use DateTimeInterface;
+
+class EventReaderRRule extends \Sabre\VObject\Recur\RRuleIterator {
+
+	public function precision(): string {
+		return $this->frequency;
+	}
+
+	public function interval(): int {
+		return $this->interval;
+	}
+
+	public function concludes(): ?DateTime {
+		// evaluate if until value is a date
+		if ($this->until instanceof DateTimeInterface) {
+			return DateTime::createFromInterface($this->until);
+		}
+		// evaluate if count value is higher than 0
+		if ($this->count > 0) {
+			// temporarily store current recurrence date and counter
+			$currentReccuranceDate = $this->currentDate;
+			$currentCounter = $this->counter;
+			// iterate over occurrences until last one (subtract 2 from count for start and end occurrence)
+			while ($this->counter <= ($this->count - 2)) {
+				$this->next();
+			}
+			// temporarly store last reccurance date
+			$lastReccuranceDate = $this->currentDate;
+			// restore current recurrence date and counter
+			$this->currentDate = $currentReccuranceDate;
+			$this->counter = $currentCounter;
+			// return last recurrence date
+			return DateTime::createFromInterface($lastReccuranceDate);
+		}
+
+		return null;
+	}
+
+	public function concludesAfter(): ?int {
+		return !empty($this->count) ? $this->count : null;
+	}
+
+	public function concludesOn(): ?DateTime {
+		return isset($this->until) ? DateTime::createFromInterface($this->until) : null;
+	}
+
+	public function daysOfWeek(): array {
+		return is_array($this->byDay) ? $this->byDay : [];
+	}
+
+	public function daysOfMonth(): array {
+		return is_array($this->byMonthDay) ? $this->byMonthDay : [];
+	}
+
+	public function daysOfYear(): array {
+		return is_array($this->byYearDay) ? $this->byYearDay : [];
+	}
+
+	public function weeksOfYear(): array {
+		return is_array($this->byWeekNo) ? $this->byWeekNo : [];
+	}
+
+	public function monthsOfYear(): array {
+		return is_array($this->byMonth) ? $this->byMonth : [];
+	}
+
+	public function isRelative(): bool {
+		return isset($this->bySetPos);
+	}
+
+	public function relativePosition(): array {
+		return is_array($this->bySetPos) ? $this->bySetPos : [];
+	}
+
+}