/**
* Call web service with the given parameters
* @param $params array GET or POST parameters
* @return DOMDocument or null in case of error
*/
function &callWebService($url, &$params, $returnType = XSL_TRANSFORMER_DOCTYPE_DOM, $method = 'GET')
{
// Create a request
$webServiceRequest = new WebServiceRequest($url, $params, $method);
// Configure and call the web service
$xmlWebService = new XmlWebService();
$xmlWebService->setReturnType($returnType);
$result =& $xmlWebService->call($webServiceRequest);
if (is_null($result)) {
// Add a flag for cases where the web service call failed because of their problems.
if ($xmlWebService->getLastResponseStatus() >= 500 || $xmlWebService->getLastResponseStatus() <= 599) {
$this->setData('serverError', true);
}
// Construct a helpful error message including
// the offending webservice url for get requests.
$webserviceUrl = $url;
if ($method == 'GET') {
$keyValuePairs = array();
foreach ($params as $key => $value) {
$keyValuePairs[] = $key . '=' . $value;
}
$webserviceUrl .= '?' . implode('&', $keyValuePairs);
}
$translationParams = array('filterName' => $this->getDisplayName(), 'webserviceUrl' => $webserviceUrl, 'httpMethod' => $method);
$this->addError(__('submission.citations.filter.webserviceError', $translationParams));
}
return $result;
}
