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