friendica-github/src/Util/JsonLD.php

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<?php
/**
* @file src/Util/JsonLD.php
*/
namespace Friendica\Util;
use Friendica\Core\Cache;
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use Exception;
/**
* @brief This class contain methods to work with JsonLD data
*/
class JsonLD
{
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/**
* @brief Loader for LD-JSON validation
*
* @param $url
*
* @return the loaded data
*/
public static function documentLoader($url)
{
$recursion = 0;
$x = debug_backtrace();
if ($x) {
foreach ($x as $n) {
if ($n['function'] === __FUNCTION__) {
$recursion ++;
}
}
}
if ($recursion > 5) {
logger('jsonld bomb detected at: ' . $url);
exit();
}
$result = Cache::get('documentLoader:' . $url);
if (!is_null($result)) {
return $result;
}
$data = jsonld_default_document_loader($url);
Cache::set('documentLoader:' . $url, $data, CACHE_DAY);
return $data;
}
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/**
* @brief Normalises a given JSON array
*
* @param array $json
*
* @return normalized JSON string
*/
public static function normalize($json)
{
jsonld_set_document_loader('Friendica\Util\JsonLD::documentLoader');
$jsonobj = json_decode(json_encode($json, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
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try {
$normalized = jsonld_normalize($jsonobj, array('algorithm' => 'URDNA2015', 'format' => 'application/nquads'));
}
catch (Exception $e) {
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$normalized = false;
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logger('normalise error:' . print_r($e, true), LOGGER_DEBUG);
}
return $normalized;
}
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/**
* @brief Compacts a given JSON array
*
* @param array $json
*
* @return comacted JSON array
*/
public static function compact($json)
{
jsonld_set_document_loader('Friendica\Util\JsonLD::documentLoader');
$context = (object)['as' => 'https://www.w3.org/ns/activitystreams',
'w3sec' => 'https://w3id.org/security',
'ostatus' => (object)['@id' => 'http://ostatus.org#', '@type' => '@id'],
'vcard' => (object)['@id' => 'http://www.w3.org/2006/vcard/ns#', '@type' => '@id'],
'uuid' => (object)['@id' => 'http://schema.org/identifier', '@type' => '@id']];
$jsonobj = json_decode(json_encode($json, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
$compacted = jsonld_compact($jsonobj, $context);
return json_decode(json_encode($compacted, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE), true);
}
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/**
* @brief Fetches an element from a JSON array
*
* @param $array
* @param $element
* @param $key
* @param $type
* @param $type_value
*
* @return fetched element
*/
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public static function fetchElement($array, $element, $key, $type = null, $type_value = null)
{
if (empty($array)) {
return false;
}
if (empty($array[$element])) {
return false;
}
if (is_string($array[$element])) {
return $array[$element];
}
if (is_null($type_value)) {
if (!empty($array[$element][$key])) {
return $array[$element][$key];
}
if (!empty($array[$element][0][$key])) {
return $array[$element][0][$key];
}
return false;
}
if (!empty($array[$element][$key]) && !empty($array[$element][$type]) && ($array[$element][$type] == $type_value)) {
return $array[$element][$key];
}
/// @todo Add array search
return false;
}
}