1 files changed, 40 insertions, 0 deletions
diff --git a/lib/classes/calendar/Owner.php b/lib/classes/calendar/Owner.php
new file mode 100644
index 0000000..a7c2519
--- /dev/null
+++ b/lib/classes/calendar/Owner.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace Studip\Calendar;
+
+/**
+ * The Studip\Calendar\Owner interface defines methods that classes whose instances own calendars
+ * shall implement to faciliate permission checks for that calendars.
+ */
+interface Owner
+{
+    /**
+     * Retrieves the Owner object for a specified owner-ID.
+     *
+     * @param string $owner_id The ID of the owner.
+     *
+     * @return Owner|null Either the Owner object if it can be found or null in case
+     *     it cannot be found.
+     */
+    public static function getCalendarOwner(string $owner_id) : ?Owner;
+
+    /**
+     * Determines whether the specified user has read permissions to the calendar.
+     *
+     * @param string|null $user_id The ID of the user for which to determine write permissions.
+     *                             Defaults to the current user if no user-ID is provided.
+     *
+     * @return bool True, if the user has read permissions, false otherwise.
+     */
+    public function isCalendarReadable(?string $user_id = null) : bool;
+
+    /**
+     * Determines whether the specified user has write permissions to the calendar.
+     *
+     * @param string|null $user_id The ID of the user for which to determine write permissions.
+     *                             Defaults to the current user if no user-ID is provided.
+     *
+     * @return bool True, if the user has write permissions, false otherwise.
+     */
+    public function isCalendarWritable(?string $user_id = null) : bool;
+}