X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FUtil%2FJsonLD.php;h=926fa1437d46aa1cb4efac0c8d79fbdaf1527d2d;hb=c07cb2c8f31154cc424e99c95740d753501e09b7;hp=8fd9f90cb4d292852547502093a341aacc824b62;hpb=0d51474e73dc50ac0b7159cb92fcadeafb976fc1;p=friendica.git

diff --git a/src/Util/JsonLD.php b/src/Util/JsonLD.php
index 8fd9f90cb4..926fa1437d 100644
--- a/src/Util/JsonLD.php
+++ b/src/Util/JsonLD.php
@@ -5,13 +5,22 @@
 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;
@@ -26,7 +35,7 @@ class JsonLD
 		}
 
 		if ($recursion > 5) {
-			logger('jsonld bomb detected at: ' . $url);
+			Logger::error('jsonld bomb detected at: ' . $url);
 			exit();
 		}
 
@@ -36,68 +45,189 @@ class JsonLD
 		}
 
 		$data = jsonld_default_document_loader($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));
 
-		$jsonobj = json_decode(json_encode($json));
+		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);
+		}
 
-		$compacted = jsonld_compact($jsonobj, $context);
+		$json = json_decode(json_encode($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_decode(json_encode($compacted), true);
+		return $json;
 	}
 
-	public static function fetchElement($array, $element, $key, $type = null, $type_value = null)
+	/**
+	 * @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 false;
+			return null;
 		}
 
-		if (empty($array[$element])) {
-			return false;
+		if (!isset($array[$element])) {
+			return null;
 		}
 
-		if (is_string($array[$element])) {
-			return $array[$element];
+		// If it isn't an array yet, make it to one
+		if (!is_int(key($array[$element]))) {
+			$array[$element] = [$array[$element]];
 		}
 
-		if (is_null($type_value)) {
-			if (!empty($array[$element][$key])) {
-				return $array[$element][$key];
+		$elements = [];
+
+		foreach ($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;
+		}
+
+		if (!isset($array[$element])) {
+			return null;
+		}
+
+		if (!is_array($array[$element])) {
+			return $array[$element];
+		}
 
-			if (!empty($array[$element][0][$key])) {
-				return $array[$element][0][$key];
+		if (is_null($type) || is_null($type_value)) {
+			$element_array = self::fetchElementArray($array, $element, $key);
+			if (is_null($element_array)) {
+				return null;
 			}
 
-			return false;
+			return array_shift($element_array);
 		}
 
-		if (!empty($array[$element][$key]) && !empty($array[$element][$type]) && ($array[$element][$type] == $type_value)) {
-			return $array[$element][$key];
+		$element_array = self::fetchElementArray($array, $element);
+		if (is_null($element_array)) {
+			return null;
 		}
 
-		/// @todo Add array search
+		foreach ($element_array as $entry) {
+			if (isset($entry[$key]) && isset($entry[$type]) && ($entry[$type] == $type_value)) {
+				return $entry[$key];
+			}
+		}
 
-		return false;
+		return null;
 	}
 }