convert binary data to string

src/backend/caldav/caldav.php

@@ -99,7 +99,9 @@ class BackendCalDAV extends BackendDiff {
                     if ($items['count'] > 0) {
                         ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendIMAP->getIdentityFromLdap() - Found entry in LDAP. Generating From"));
                         // We get the first object. It's your responsability to make the query unique
-                        $caldav_path = str_replace('%i', $items[0][CALDAV_IDENTITY_LDAP_IDENTIFIER][0], $caldav_path);
+
+                        $identity = CALDAV_IDENTITY_LDAP_IDENTIFIER === "objectguid" ? $this->convertObjectGUID2Str($items[0][CALDAV_IDENTITY_LDAP_IDENTIFIER][0]) : $items[0][CALDAV_IDENTITY_LDAP_IDENTIFIER][0]
+                        $caldav_path = str_replace('%i', , $caldav_path);
                     }
                     else {
                         ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendIMAP->getIdentityFromLdap() - No entry found in LDAP"));
@@ -123,6 +125,25 @@ class BackendCalDAV extends BackendDiff {
         return $caldav_path;
     }
 
+    private function convertObjectGUID2Str($oguid) {
+		$hex_guid = bin2hex($oguid);
+		$hex_guid_to_guid_str = '';
+		for($k = 1; $k <= 4; ++$k) {
+			$hex_guid_to_guid_str .= substr($hex_guid, 8 - 2 * $k, 2);
+		}
+		$hex_guid_to_guid_str .= '-';
+		for($k = 1; $k <= 2; ++$k) {
+			$hex_guid_to_guid_str .= substr($hex_guid, 12 - 2 * $k, 2);
+		}
+		$hex_guid_to_guid_str .= '-';
+		for($k = 1; $k <= 2; ++$k) {
+			$hex_guid_to_guid_str .= substr($hex_guid, 16 - 2 * $k, 2);
+		}
+		$hex_guid_to_guid_str .= '-' . substr($hex_guid, 16, 4);
+		$hex_guid_to_guid_str .= '-' . substr($hex_guid, 20);
+		return strtoupper($hex_guid_to_guid_str);
+	}
+
     /**
      * The connections to CalDAV are always directly closed. So nothing special needs to happen here.
      * @see IBackend::Logoff()