namespace Friendica\Util;
use Friendica\Core\Cache;
-use digitalbazaar\jsonld as DBJsonLD;
+use Friendica\Core\Logger;
+use Exception;
/**
* @brief This class contain methods to work with JsonLD data
*/
class JsonLD
{
+ /**
+ * @brief Loader for LD-JSON validation
+ *
+ * @param $url
+ *
+ * @return mixed the loaded data
+ * @throws \JsonLdException
+ */
public static function documentLoader($url)
{
$recursion = 0;
}
if ($recursion > 5) {
- logger('jsonld bomb detected at: ' . $url);
+ Logger::error('jsonld bomb detected at: ' . $url);
exit();
}
}
$data = jsonld_default_document_loader($url);
- Cache::set('documentLoader:' . $url, $data, CACHE_DAY);
+ Cache::set('documentLoader:' . $url, $data, Cache::DAY);
return $data;
}
+ /**
+ * @brief Normalises a given JSON array
+ *
+ * @param array $json
+ *
+ * @return mixed|bool normalized JSON string
+ * @throws Exception
+ */
public static function normalize($json)
{
jsonld_set_document_loader('Friendica\Util\JsonLD::documentLoader');
- $jsonobj = json_decode(json_encode($json));
+ $jsonobj = json_decode(json_encode($json, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
- return jsonld_normalize($jsonobj, array('algorithm' => 'URDNA2015', 'format' => 'application/nquads'));
+ try {
+ $normalized = jsonld_normalize($jsonobj, array('algorithm' => 'URDNA2015', 'format' => 'application/nquads'));
+ }
+ catch (Exception $e) {
+ $normalized = false;
+ $messages = [];
+ $currentException = $e;
+ do {
+ $messages[] = $currentException->getMessage();
+ } while($currentException = $currentException->getPrevious());
+
+ Logger::warning('JsonLD normalize error');
+ Logger::notice('JsonLD normalize error', ['messages' => $messages]);
+ Logger::info('JsonLD normalize error', ['trace' => $e->getTraceAsString()]);
+ Logger::debug('JsonLD normalize error', ['jsonobj' => $jsonobj]);
+ }
+
+ return $normalized;
}
+ /**
+ * @brief Compacts a given JSON array
+ *
+ * @param array $json
+ *
+ * @return array Compacted JSON array
+ * @throws Exception
+ */
public static function compact($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'],
+ $context = (object)['as' => 'https://www.w3.org/ns/activitystreams#',
+ 'w3id' => 'https://w3id.org/security#',
+ 'ldp' => (object)['@id' => 'http://www.w3.org/ns/ldp#', '@type' => '@id'],
'vcard' => (object)['@id' => 'http://www.w3.org/2006/vcard/ns#', '@type' => '@id'],
- 'uuid' => (object)['@id' => 'http://schema.org/identifier', '@type' => '@id']];
+ 'dfrn' => (object)['@id' => 'http://purl.org/macgirvin/dfrn/1.0/', '@type' => '@id'],
+ 'diaspora' => (object)['@id' => 'https://diasporafoundation.org/ns/', '@type' => '@id'],
+ 'ostatus' => (object)['@id' => 'http://ostatus.org#', '@type' => '@id'],
+ 'dc' => (object)['@id' => 'http://purl.org/dc/terms/', '@type' => '@id'],
+ 'toot' => (object)['@id' => 'http://joinmastodon.org/ns#', '@type' => '@id'],
+ 'litepub' => (object)['@id' => 'http://litepub.social/ns#', '@type' => '@id']];
+
+ // Preparation for adding possibly missing content to the context
+ if (!empty($json['@context']) && is_string($json['@context'])) {
+ $json['@context'] = [$json['@context']];
+ }
+
+ // Workaround for servers with missing context
+ // See issue https://github.com/nextcloud/social/issues/330
+ if (!empty($json['@context']) && is_array($json['@context'])) {
+ $json['@context'][] = 'https://w3id.org/security/v1';
+ }
+
+ // Trying to avoid memory problems with large content fields
+ if (!empty($json['object']['source']['content'])) {
+ $content = $json['object']['source']['content'];
+ $json['object']['source']['content'] = '';
+ }
+
+ $jsonobj = json_decode(json_encode($json, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
+
+ try {
+ $compacted = jsonld_compact($jsonobj, $context);
+ }
+ catch (Exception $e) {
+ $compacted = false;
+ Logger::error('compacting error');
+ // Sooner or later we should log some details as well - but currently this leads to memory issues
+ // Logger::log('compacting error:' . substr(print_r($e, true), 0, 10000), Logger::DEBUG);
+ }
+
+ $json = json_decode(json_encode($compacted, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE), true);
+
+ if (isset($json['as:object']['as:source']['as:content']) && !empty($content)) {
+ $json['as:object']['as:source']['as:content'] = $content;
+ }
+
+ return $json;
+ }
+
+ /**
+ * @brief Fetches an element array from a JSON array
+ *
+ * @param $array
+ * @param $element
+ * @param $key
+ *
+ * @return array fetched element
+ */
+ public static function fetchElementArray($array, $element, $key = '@id')
+ {
+ if (empty($array)) {
+ return null;
+ }
- $jsonobj = json_decode(json_encode($json));
+ if (!isset($array[$element])) {
+ return null;
+ }
+
+ // If it isn't an array yet, make it to one
+ if (!is_int(key($array[$element]))) {
+ $array[$element] = [$array[$element]];
+ }
+
+ $elements = [];
+
+ foreach ($array[$element] as $entry) {
+ if (!is_array($entry)) {
+ $elements[] = $entry;
+ } elseif (isset($entry[$key])) {
+ $elements[] = $entry[$key];
+ } elseif (!empty($entry) || !is_array($entry)) {
+ $elements[] = $entry;
+ }
+ }
+
+ return $elements;
+ }
+
+ /**
+ * @brief Fetches an element from a JSON array
+ *
+ * @param $array
+ * @param $element
+ * @param $key
+ * @param $type
+ * @param $type_value
+ *
+ * @return string fetched element
+ */
+ public static function fetchElement($array, $element, $key = '@id', $type = null, $type_value = null)
+ {
+ if (empty($array)) {
+ return null;
+ }
- $compacted = jsonld_compact($jsonobj, $context);
+ if (!isset($array[$element])) {
+ return null;
+ }
+
+ if (!is_array($array[$element])) {
+ return $array[$element];
+ }
+
+ if (is_null($type) || is_null($type_value)) {
+ $element_array = self::fetchElementArray($array, $element, $key);
+ if (is_null($element_array)) {
+ return null;
+ }
+
+ return array_shift($element_array);
+ }
+
+ $element_array = self::fetchElementArray($array, $element);
+ if (is_null($element_array)) {
+ return null;
+ }
+
+ foreach ($element_array as $entry) {
+ if (isset($entry[$key]) && isset($entry[$type]) && ($entry[$type] == $type_value)) {
+ return $entry[$key];
+ }
+ }
- return json_decode(json_encode($compacted), true);
+ return null;
}
}
projects / friendica.git / blobdiff