public function createDocumentLoader()
{
$base = 'http://json-ld.org/test-suite';
$test = $this;
$load_locally = function ($url) use($test, $base) {
$doc = (object) array('contextUrl' => null, 'documentUrl' => $url, 'document' => null);
$options = property_exists($test->data, 'option') ? $test->data->option : null;
if ($options and $url === $test->base) {
if (property_exists($options, 'redirectTo') && property_exists($options, 'httpStatus') && $options->httpStatus >= '300') {
$doc->documentUrl = $test->manifest->data->baseIri . $options->redirectTo;
} else {
if (property_exists($options, 'httpLink')) {
$content_type = property_exists($options, 'contentType') ? $options->contentType : null;
$extension = pathinfo($url, PATHINFO_EXTENSION);
if (!$content_type && $extension === 'jsonld') {
$content_type = 'application/ld+json';
}
$link_header = $options->httpLink;
if (is_array($link_header)) {
$link_header = join(',', $link_header);
}
$link_header = jsonld_parse_link_header($link_header);
if (isset($link_header['http://www.w3.org/ns/json-ld#context'])) {
$link_header = $link_header['http://www.w3.org/ns/json-ld#context'];
} else {
$link_header = null;
}
if ($link_header && $content_type !== 'application/ld+json') {
if (is_array($link_header)) {
throw new Exception('multiple context link headers');
}
$doc->contextUrl = $link_header->target;
}
}
}
}
global $ROOT_MANIFEST_DIR;
if (strpos($doc->documentUrl, ':') === false) {
$filename = join(DIRECTORY_SEPARATOR, array($ROOT_MANIFEST_DIR, $doc->documentUrl));
$doc->documentUrl = 'file://' . $filename;
} else {
$filename = join(DIRECTORY_SEPARATOR, array($ROOT_MANIFEST_DIR, substr($doc->documentUrl, strlen($base))));
}
try {
$doc->document = Util::readJson($filename);
} catch (Exception $e) {
throw new Exception('loading document failed');
}
return $doc;
};
$local_loader = function ($url) use($test, $base, $load_locally) {
// always load remote-doc and non-base tests remotely
if (strpos($url, $base) !== 0 && strpos($url, ':') !== false || $test->manifest->data->name === 'Remote document') {
return call_user_func('jsonld_default_document_loader', $url);
}
// attempt to load locally
return call_user_func($load_locally, $url);
};
return $local_loader;
}
/**
* The default implementation to retrieve JSON-LD at the given secure URL.
*
* @param string $url the secure URL to to retrieve.
*
* @return stdClass the RemoteDocument object.
*/
function jsonld_default_secure_document_loader($url)
{
if (strpos($url, 'https') !== 0) {
throw new JsonLdException("Could not GET url: '{$url}'; 'https' is required.", 'jsonld.LoadDocumentError', 'loading document failed');
}
$doc = (object) array('contextUrl' => null, 'document' => null, 'documentUrl' => $url);
$redirects = array();
// default JSON-LD https GET implementation
$opts = array('http' => array('method' => 'GET', 'header' => "Accept: application/ld+json\r\n"), 'ssl' => array('verify_peer' => true, 'allow_self_signed' => false, 'cafile' => '/etc/ssl/certs/ca-certificates.crt'));
$context = stream_context_create($opts);
$content_type = null;
stream_context_set_params($context, array('notification' => function ($notification_code, $severity, $message) use(&$redirects, &$content_type) {
switch ($notification_code) {
case STREAM_NOTIFY_REDIRECTED:
$redirects[] = $message;
break;
case STREAM_NOTIFY_MIME_TYPE_IS:
$content_type = $message;
break;
}
}));
$result = @file_get_contents($url, false, $context);
if ($result === false) {
throw new JsonLdException('Could not retrieve a JSON-LD document from the URL: ' + $url, 'jsonld.LoadDocumentError', 'loading document failed');
}
$link_header = array();
foreach ($http_response_header as $header) {
if (strpos($header, 'link') === 0) {
$value = explode(': ', $header);
if (count($value) > 1) {
$link_header[] = $value[1];
}
}
}
$link_header = jsonld_parse_link_header(join(',', $link_header));
if (isset($link_header['http://www.w3.org/ns/json-ld#context'])) {
$link_header = $link_header['http://www.w3.org/ns/json-ld#context'];
} else {
$link_header = null;
}
if ($link_header && $content_type !== 'application/ld+json') {
// only 1 related link header permitted
if (is_array($link_header)) {
throw new JsonLdException('URL could not be dereferenced, it has more than one ' . 'associated HTTP Link Header.', 'jsonld.LoadDocumentError', 'multiple context link headers', array('url' => $url));
}
$doc->{'contextUrl'} = $link_header->target;
}
// update document url based on redirects
foreach ($redirects as $redirect) {
if (strpos($redirect, 'https') !== 0) {
throw new JsonLdException("Could not GET redirected url: '{$redirect}'; 'https' is required.", 'jsonld.LoadDocumentError', 'loading document failed');
}
$url = $redirect;
}
$doc->document = $result;
$doc->documentUrl = $url;
return $doc;
}