/**
* Call MetaLib X-Server
*
* @param string $operation X-Server operation
* @param array $params URL Parameters
*
* @return mixed simpleXMLElement | PEAR_Error
* @access protected
*/
protected function callXServer($operation, $params)
{
$request = new Proxy_Request($this->config['General']['url'], array('method' => 'POST'));
// Declare UTF-8 encoding so that SimpleXML won't encode characters.
$xml = simplexml_load_string('<?xml version="1.0" encoding="UTF-8"?><x_server_request/>');
$op = $xml->addChild($operation);
$this->paramsToXml($op, $params);
$request->addPostdata('xml', $xml->asXML());
if ($this->debug) {
echo "<!-- {$operation}\n";
if ($operation != 'login_request') {
echo $xml->asXML();
}
echo "-->\n";
}
$result = $request->sendRequest();
if (PEAR::isError($result)) {
return $result;
}
if ($this->debug) {
echo "<!-- \n";
echo $request->getResponseBody();
echo "-->\n\n\n";
}
if ($request->getResponseCode() >= 400) {
return new PEAR_Error("HTTP Request failed: " . $request->getResponseCode());
}
$xml = simplexml_load_string($request->getResponseBody());
$errors = $xml->xpath('//local_error | //global_error');
if (!empty($errors)) {
if ($errors[0]->error_code == 6026) {
return new PEAR_Error('Search timed out');
}
return new PEAR_Error($errors[0]->asXML());
}
return $xml;
}
