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-rw-r--r--vendor/sabre/vobject/lib/TimezoneGuesser/GuessFromLicEntry.php33
1 files changed, 33 insertions, 0 deletions
diff --git a/vendor/sabre/vobject/lib/TimezoneGuesser/GuessFromLicEntry.php b/vendor/sabre/vobject/lib/TimezoneGuesser/GuessFromLicEntry.php
new file mode 100644
index 000000000..f340a3962
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+++ b/vendor/sabre/vobject/lib/TimezoneGuesser/GuessFromLicEntry.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabre\VObject\TimezoneGuesser;
+
+use DateTimeZone;
+use Sabre\VObject\Component\VTimeZone;
+use Sabre\VObject\TimeZoneUtil;
+
+/**
+ * Some clients add 'X-LIC-LOCATION' with the olson name.
+ */
+class GuessFromLicEntry implements TimezoneGuesser
+{
+ public function guess(VTimeZone $vtimezone, bool $failIfUncertain = false): ?DateTimeZone
+ {
+ if (!isset($vtimezone->{'X-LIC-LOCATION'})) {
+ return null;
+ }
+
+ $lic = (string) $vtimezone->{'X-LIC-LOCATION'};
+
+ // Libical generators may specify strings like
+ // "SystemV/EST5EDT". For those we must remove the
+ // SystemV part.
+ if ('SystemV/' === substr($lic, 0, 8)) {
+ $lic = substr($lic, 8);
+ }
+
+ return TimeZoneUtil::getTimeZone($lic, null, $failIfUncertain);
+ }
+}