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<?php
/**
* @license GPL2 or any later version
*
* @property string $id alias column for host_id
* @property string $host_id database column
* @property string $sorm_class database column
* @property string $name database column
* @property string $url database column
* @property string $public_key database column
* @property string|null $private_key database column
* @property int $active database column
* @property int $index_server database column
* @property int $allowed_as_index_server database column
* @property int $last_updated database column
* @property int $chdate database column
* @property int $mkdate database column
*/
class OERHostOERSI extends OERHost
{
/**
* Executes a search request on the host.
* @param string|null $text : the search string
* @param string|null $tag : a tag to search for
*/
public function fetchRemoteSearch($text = null, $tag = null)
{
$endpoint_url = 'https://oersi.org/resources/api/search/oer_data/_search';
$appendix = Config::get()->OER_OERSI_ONLY_DOWNLOADABLE ? ' AND _exists_:encoding.contentUrl' : '';
if ($tag) {
$endpoint_url .= '?q=' . urlencode("keywords:" . $tag . $appendix);
} else {
$endpoint_url .= '?q=' . urlencode($text . $appendix);
}
$cr = curl_init();
curl_setopt($cr, CURLOPT_URL, $endpoint_url);
curl_setopt($cr, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($cr, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($cr, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($cr, CURLOPT_SSL_VERIFYHOST, false);
$stream_context_options = stream_context_get_options(get_default_http_stream_context($endpoint_url));
curl_setopt($cr, CURLOPT_PROXY, isset($stream_context_options['http']['proxy']) ? Config::get()->HTTP_PROXY : '');
$output = curl_exec($cr);
$error = curl_error($cr);
if ($error) {
$error_number = curl_getinfo($cr, CURLINFO_HTTP_CODE);
error_log('OERSI search is not working. '.$error_number.': '.$error);
}
curl_close($cr);
if ($output) {
$json = json_decode($output, true);
if ($json !== null) {
foreach ((array)$json['hits']['hits'] as $material_data) {
//check if material already in database from this or another OER Campus host
if (OERHost::URIExists($material_data['_source']['id'])) {
continue;
}
$material = OERMaterial::findOneBySQL('foreign_material_id = ? AND host_id = ?', [
md5($material_data['_source']['id']),
$this->getId()
]);
if (!$material) {
$material = new OERMaterial();
$material['foreign_material_id'] = md5($material_data['_source']['id']);
$material['host_id'] = $this->getId();
}
$material['name'] = mb_substr($material_data['_source']['name'], 0, 64);
$material['draft'] = '0';
$material['filename'] = '';
$material['short_description'] = '';
$material['description'] = $material_data['_source']['description'] ?: '';
$material['difficulty_start'] = 0;
$material['difficulty_end'] = 12;
$material['uri'] = $material_data['_source']['id'];
$material['source_url'] = $material_data['_source']['id'];
$material['content_type'] = $material_data['_source']['encoding'][0]['encodingFormat'] ?: '';
$material['license_identifier'] = $this->getLicenseID($material_data['_source']['license']['id']) ?: '';
if (!$material['category']) {
$material['category'] = $material->autoDetectCategory();
}
$material['front_image_content_type'] = !empty($material_data['_source']['image']) ? 'image/jpg' : null;
$material['data'] = [
'front_image_url' => $material_data['_source']['image'] ?? null,
'download' => $material_data['_source']['encoding'][0]['contentUrl'] ?: '',
'id' => $material_data['_id'],
'organization' => $material_data['_source']['sourceOrganization'][0]['name'] ?: $material_data['_source']['publisher'][0]['name']
];
$material->store();
//set users:
$userdata = [];
foreach ((array) $material_data['_source']['creator'] as $creator) {
$userdata[] = [
'user_id' => md5($creator['name']),
'name' => $creator['name'],
'host_url' => $this['url']
];
}
$material->setUsers($userdata);
//set topics:
if (isset($material_data['_source']['keywords'])) {
$material->setTopics($material_data['_source']['keywords']);
}
}
} else {
error_log('OERSI returns bad JSON data: '.$output);
}
}
}
/**
* Pushes some data to the foreign OERHost.
* @param string $endpoint : part behind the host-url like "push_data"
* @param array $data : the data to be pushed as an associative array
* @return bool|CurlHandle|resource
*/
public function pushDataToEndpoint($endpoint, $data)
{
return true;
}
/**
* Fetches all information of an item from that host. This is a request.
* @param string $foreign_material_id : foreign id of that oer-material
* @return array|null : data of that material or null on error.
*/
public function fetchItemData(OERMaterial $material)
{
$endpoint_url = 'https://oersi.org/resources/' . urlencode($material['data']['id']) . '?format=json';
$output = @file_get_contents($endpoint_url, false, get_default_http_stream_context($endpoint_url));
if ($output) {
$output = json_decode($output, true);
if ($output) {
$data = [];
$data['name'] = mb_substr($output['name'], 0, 64);
$data['draft'] = '0';
$data['filename'] = '';
$data['short_description'] = '';
$data['description'] = $output['description'] ?? '';
$data['difficulty_start'] = 12;
$data['uri'] = $output['encoding'][0]['contentUrl'] ?? '';
$data['source_url'] = $output['id'];
$data['content_type'] = $output['encoding'][0]['encodingFormat'] ?? '';
$data['license_identifier'] = $this->getLicenseID($output['license']['id']) ?: '';
if (empty($data['category'])) {
$data['category'] = $material->autoDetectCategory();
}
$data['front_image_content_type'] = !empty($output['image']) ? 'image/jpg' : null;
$data['data'] = $material['data']->getArrayCopy();
$data['data']['download'] = $output['encoding'][0]['contentUrl'] ?? '';
$data['data']['front_image_url'] = $output['image'] ?? '';
$data['data']['organization'] = $output['sourceOrganization'][0]['name'] ?? $output['publisher'][0]['name'] ?? '';
return [
'data' => $data,
'topics' => $output['keywords'] ?? []
];
}
} else {
return ['deleted' => 1];
}
}
public function getFrontImageURL(OERMaterial $material)
{
return $material['data'] ? $material['data']['front_image_url'] : null;
}
/**
* Tries to match the CC-license URL from OERSI to an spdx-identifier, which is used in Stud.IP
* @param $license : an URL
* @return string|null
*/
protected function getLicenseID($license)
{
$matched = preg_match("^https:\/\/creativecommons.org\/licenses\/([\w\d\-\.]+)\/([\w\d\-\.]+)^", $license, $matches);
if ($matched) {
$spdx_id = 'CC-' . strtoupper($matches[1]) . '-' . strtoupper($matches[2]);
if (License::find($spdx_id)) {
return $spdx_id;
}
}
return null;
}
public function isReviewable()
{
return false;
}
public function getDownloadURLForMaterial(OERMaterial $material)
{
return $material['data']['download'] ?? $material['uri'];
}
public function cbCreateKeysIfNecessary()
{
//do nothing
}
}
|
