+// CSRF prevention
+else {
+ // don't check for valid request tokens in these actions
+ $request_check_whitelist = array('login'=>1, 'spell'=>1);
+
+ // check client X-header to verify request origin
+ if ($OUTPUT->ajax_call) {
+ if (rc_request_header('X-Roundcube-Request') != $RCMAIL->get_request_token() && !$RCMAIL->config->get('devel_mode')) {
+ header('HTTP/1.1 404 Not Found');
+ die("Invalid Request");
+ }
+ }
+ // check request token in POST form submissions
+ else if (!empty($_POST) && !$request_check_whitelist[$RCMAIL->action] && !$RCMAIL->check_request()) {
+ $OUTPUT->show_message('invalidrequest', 'error');
+ $OUTPUT->send($RCMAIL->task);
+ }