function domnode_to_array($node)
{
$output = array();
switch ($node->nodeType) {
case XML_CDATA_SECTION_NODE:
case XML_TEXT_NODE:
$output = trim($node->textContent);
break;
case XML_ELEMENT_NODE:
for ($i = 0, $m = $node->childNodes->length; $i < $m; $i++) {
$child = $node->childNodes->item($i);
$v = domnode_to_array($child);
if (isset($child->tagName)) {
$t = $child->tagName;
if (!isset($output[$t])) {
$output[$t] = array();
}
$output[$t][] = $v;
} elseif ($v || $v === '0') {
$output = (string) $v;
}
}
if ($node->attributes->length && !is_array($output)) {
//Has attributes but isn't an array
$output = array('@content' => $output);
//Change output into an array.
}
if (is_array($output)) {
if ($node->attributes->length) {
$a = array();
foreach ($node->attributes as $attrName => $attrNode) {
$a[$attrName] = (string) $attrNode->value;
}
$output['@attributes'] = $a;
}
foreach ($output as $t => $v) {
if (is_array($v) && count($v) == 1 && $t != '@attributes') {
$output[$t] = $v[0];
}
}
}
break;
}
return $output;
}
function immediate_update_outcome_in_canvas($oauth_consumer_key, $secret, $lti_sourced_id, $lis_outcome_service_url, $score)
{
set_time_limit(180);
$xmlRequest = "<?xml version = \"1.0\" encoding = \"UTF-8\"?>\n<imsx_POXEnvelopeRequest xmlns=\"http://www.imsglobal.org/services/ltiv1p1/xsd/imsoms_v1p0\">\n <imsx_POXHeader>\n <imsx_POXRequestHeaderInfo>\n <imsx_version>V1.0</imsx_version>\n <imsx_messageIdentifier>999999123</imsx_messageIdentifier>\n </imsx_POXRequestHeaderInfo>\n </imsx_POXHeader>\n <imsx_POXBody>\n <replaceResultRequest>\n <resultRecord>\n <sourcedGUID>\n <sourcedId>{$lti_sourced_id}</sourcedId>\n </sourcedGUID>\n <result>\n <resultScore>\n <language>en</language>\n <textString>" . $score . "</textString>\n </resultScore>\n </result>\n </resultRecord>\n </replaceResultRequest>\n </imsx_POXBody>\n</imsx_POXEnvelopeRequest>";
$hash = base64_encode(sha1($xmlRequest, TRUE));
$params = array('oauth_body_hash' => $hash);
$hmac_method = new OAuthSignatureMethod_HMAC_SHA1();
$consumer = new OAuthConsumer($oauth_consumer_key, $secret, NULL);
$req = OAuthRequest::from_consumer_and_token($consumer, NULL, 'POST', $lis_outcome_service_url, $params);
$req->sign_request($hmac_method, $consumer, NULL);
$params = $req->get_parameters();
$header = $req->to_header();
$header .= "\nContent-type: application/xml";
$ext_response = do_post_request($lis_outcome_service_url, $xmlRequest, $header);
$ext_doc = new DOMDocument();
set_error_handler(array($this, 'HandleXmlError'));
$ext_doc->loadXML($ext_response);
restore_error_handler();
$ext_nodes = domnode_to_array($ext_doc->documentElement);
if (!isset($ext_nodes['imsx_POXHeader']['imsx_POXResponseHeaderInfo']['imsx_statusInfo']['imsx_codeMajor'])) {
throw new Exception("No imsx_codeMajor from outcome service for " . $lti_sourced_id);
}
if ($ext_nodes['imsx_POXHeader']['imsx_POXResponseHeaderInfo']['imsx_statusInfo']['imsx_codeMajor'] != 'success' && isset($ext_nodes['imsx_POXHeader']['imsx_POXResponseHeaderInfo']['imsx_statusInfo']['imsx_description']) && $ext_nodes['imsx_POXHeader']['imsx_POXResponseHeaderInfo']['imsx_statusInfo']['imsx_description'] != 'User is no longer in course') {
throw new Exception("No success code from outcome service for " . $lti_sourced_id);
}
}
/**
* convert an XML structure string into an array
* @param string $xmlstr
* @return multitype:
*/
public static function xmlstr_to_array($xmlstr)
{
if ($xmlstr == null || empty($xmlstr)) {
return array();
}
$doc = new \DOMDocument();
$doc->loadXML(utf8_encode($xmlstr));
return domnode_to_array($doc->documentElement);
}
