public function render(Register $ParameterOutput)
{
$result = null;
$doc = new XMLDocument();
if (isset($this->parameters()->url)) {
$this->parameters()->url = self::replaceParametersInString($this->parameters()->url, $ParameterOutput);
}
if (isset($this->parameters()->xpath)) {
$this->parameters()->xpath = self::replaceParametersInString($this->parameters()->xpath, $ParameterOutput);
}
$cache_id = md5($this->parameters()->url . serialize($this->parameters()->namespaces) . $this->parameters()->xpath);
$cache = Cache::instance();
$cachedData = $cache->read($cache_id);
$writeToCache = false;
$force_empty_result = false;
$valid = true;
$result = NULL;
$creation = DateTimeObj::get('c');
if (isset($this->parameters()->timeout)) {
$timeout = (int) max(1, $this->parameters()->timeout);
}
if (!is_array($cachedData) || empty($cachedData) || time() - $cachedData['creation'] > $this->parameters()->{'cache-timeout'} * 60) {
if (Mutex::acquire($cache_id, $timeout, TMP)) {
$start = precision_timer();
$ch = new Gateway();
$ch->init();
$ch->setopt('URL', $this->parameters()->url);
$ch->setopt('TIMEOUT', $this->parameters()->timeout);
$xml = $ch->exec();
$writeToCache = true;
$end = precision_timer('STOP', $start);
$info = $ch->getInfoLast();
Mutex::release($cache_id, TMP);
$xml = trim($xml);
if ((int) $info['http_code'] != 200 || !preg_match('/(xml|plain|text)/i', $info['content_type'])) {
$writeToCache = false;
if (is_array($cachedData) && !empty($cachedData)) {
$xml = trim($cachedData['data']);
$valid = false;
$creation = DateTimeObj::get('c', $cachedData['creation']);
} else {
$result = $doc->createElement($this->parameters()->{'root-element'});
$result->setAttribute('valid', 'false');
if ($end > $timeout) {
$result->appendChild($doc->createElement('error', sprintf('Request timed out. %d second limit reached.', $timeout)));
} else {
$result->appendChild($doc->createElement('error', sprintf('Status code %d was returned. Content-type: %s', $info['http_code'], $info['content_type'])));
}
return $result;
}
} elseif (strlen($xml) > 0 && !General::validateXML($xml, $errors)) {
$writeToCache = false;
if (is_array($cachedData) && !empty($cachedData)) {
$xml = trim($cachedData['data']);
$valid = false;
$creation = DateTimeObj::get('c', $cachedData['creation']);
} else {
$result = $doc->createElement($this->parameters()->{'root-element'}, $doc->createElement('error', __('XML returned is invalid.')), array('valid' => 'false'));
return $result;
}
} elseif (strlen($xml) == 0) {
$force_empty_result = true;
}
} elseif (is_array($cachedData) && !empty($cachedData)) {
$xml = trim($cachedData['data']);
$valid = false;
$creation = DateTimeObj::get('c', $cachedData['creation']);
if (empty($xml)) {
$force_empty_result = true;
}
} else {
$force_empty_result = true;
}
} else {
$xml = trim($cachedData['data']);
$creation = DateTimeObj::get('c', $cachedData['creation']);
}
if (!$force_empty_result) {
$result = new XMLDocument();
$root = $result->createElement($this->parameters()->{'root-element'});
//XPath Approach, saves Transforming the Document.
$xDom = new XMLDocument();
$xDom->loadXML($xml);
if ($xDom->hasErrors()) {
$root->setAttribute('valid', 'false');
$root->appendChild($result->createElement('error', __('XML returned is invalid.')));
$messages = $result->createElement('messages');
foreach ($xDom->getErrors() as $e) {
if (strlen(trim($e->message)) == 0) {
continue;
}
$messages->appendChild($result->createElement('item', General::sanitize($e->message)));
}
$root->appendChild($messages);
} else {
if ($writeToCache) {
$cache->write($cache_id, $xml);
}
$xpath = new DOMXPath($xDom);
## Namespaces
if (is_array($this->parameters()->namespaces) && !empty($this->parameters()->namespaces)) {
foreach ($this->parameters()->namespaces as $index => $namespace) {
$xpath->registerNamespace($namespace['name'], $namespace['uri']);
}
}
$xpath_list = $xpath->query($this->parameters()->xpath);
foreach ($xpath_list as $node) {
if ($node instanceof XMLDocument) {
$root->appendChild($result->importNode($node->documentElement, true));
} else {
$root->appendChild($result->importNode($node, true));
}
}
$root->setAttribute('status', $valid === true ? 'fresh' : 'stale');
$root->setAttribute('creation', $creation);
}
}
if (!$root->hasChildNodes() || $force_empty_result) {
$this->emptyXMLSet($root);
}
$result->appendChild($root);
return $result;
}
