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Switch to parsing compacted JSON data

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This commit is contained in:
Michael 2018-10-07 13:37:05 +00:00
parent f8b74033a4
commit 3a74f3364d
4 changed files with 226 additions and 114 deletions
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7
src/Protocol/ActivityPub/Processor.php
View file

@ -52,7 +52,7 @@ class Processor
$tag_text = ''; $tag_text = '';
foreach ($tags as $tag) { foreach ($tags as $tag) {
if (in_array($tag['type'], ['Mention', 'Hashtag'])) { if (in_array(defaults($tag, 'type', ''), ['Mention', 'Hashtag'])) {
if (!empty($tag_text)) { if (!empty($tag_text)) {
$tag_text .= ','; $tag_text .= ',';
} }
@ -210,9 +210,8 @@ class Processor
$item = self::constructAttachList($activity['attachments'], $item); $item = self::constructAttachList($activity['attachments'], $item);
$source = JsonLD::fetchElement($activity, 'source', 'content', 'mediaType', 'text/bbcode'); if (!empty($activity['source'])) {
if (!empty($source)) { $item['body'] = $activity['source'];
$item['body'] = $source;
} }
$item['protocol'] = Conversation::PARCEL_ACTIVITYPUB; $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;

241
src/Protocol/ActivityPub/Receiver.php
View file

@ -36,6 +36,11 @@ use Friendica\Protocol\ActivityPub;
*/ */
class Receiver class Receiver
{ {
const PUBLIC_COLLECTION = 'as:Public';
const ACCOUNT_TYPES = ['as:Person', 'as:Organization', 'as:Service', 'as:Group', 'as:Application'];
const CONTENT_TYPES = ['as:Note', 'as:Article', 'as:Video', 'as:Image'];
const ACTIVITY_TYPES = ['as:Like', 'as:Dislike', 'as:Accept', 'as:Reject', 'as:TentativeAccept'];
/** /**
* Checks if the web request is done for the AP protocol * Checks if the web request is done for the AP protocol
* *
@ -48,7 +53,7 @@ class Receiver
} }
/** /**
* * Checks incoming message from the inbox
* *
* @param $body * @param $body
* @param $header * @param $header
@ -66,14 +71,17 @@ class Receiver
$activity = json_decode($body, true); $activity = json_decode($body, true);
$actor = JsonLD::fetchElement($activity, 'actor', 'id');
logger('Message for user ' . $uid . ' is from actor ' . $actor, LOGGER_DEBUG);
if (empty($activity)) { if (empty($activity)) {
logger('Invalid body.', LOGGER_DEBUG); logger('Invalid body.', LOGGER_DEBUG);
return; return;
} }
$ldactivity = JsonLD::compact($activity);
$actor = JsonLD::fetchElement($ldactivity, 'as:actor');
logger('Message for user ' . $uid . ' is from actor ' . $actor, LOGGER_DEBUG);
if (LDSignature::isSigned($activity)) { if (LDSignature::isSigned($activity)) {
$ld_signer = LDSignature::getSigner($activity); $ld_signer = LDSignature::getSigner($activity);
if (empty($ld_signer)) { if (empty($ld_signer)) {
@ -100,7 +108,7 @@ class Receiver
$trust_source = false; $trust_source = false;
} }
self::processActivity($activity, $body, $uid, $trust_source); self::processActivity($activity, $ldactivity, $body, $uid, $trust_source);
} }
/** /**
@ -112,16 +120,18 @@ class Receiver
* *
* @return * @return
*/ */
private static function prepareObjectData($activity, $uid, &$trust_source) private static function prepareObjectData($activity, $ldactivity, $uid, &$trust_source)
{ {
$actor = JsonLD::fetchElement($activity, 'actor', 'id'); $actor = JsonLD::fetchElement($ldactivity, 'as:actor');
if (empty($actor)) { if (empty($actor)) {
logger('Empty actor', LOGGER_DEBUG); logger('Empty actor', LOGGER_DEBUG);
return []; return [];
} }
$type = JsonLD::fetchElement($ldactivity, '@type');
// Fetch all receivers from to, cc, bto and bcc // Fetch all receivers from to, cc, bto and bcc
$receivers = self::getReceivers($activity, $actor); $receivers = self::getReceivers($ldactivity, $actor);
// When it is a delivery to a personal inbox we add that user to the receivers // When it is a delivery to a personal inbox we add that user to the receivers
if (!empty($uid)) { if (!empty($uid)) {
@ -132,34 +142,34 @@ class Receiver
logger('Receivers: ' . json_encode($receivers), LOGGER_DEBUG); logger('Receivers: ' . json_encode($receivers), LOGGER_DEBUG);
$object_id = JsonLD::fetchElement($activity, 'object', 'id'); $object_id = JsonLD::fetchElement($ldactivity, 'as:object');
if (empty($object_id)) { if (empty($object_id)) {
logger('No object found', LOGGER_DEBUG); logger('No object found', LOGGER_DEBUG);
return []; return [];
} }
// Fetch the content only on activities where this matters // Fetch the content only on activities where this matters
if (in_array($activity['type'], ['Create', 'Announce'])) { if (in_array($type, ['as:Create', 'as:Announce'])) {
$object_data = self::fetchObject($object_id, $activity['object'], $trust_source); $object_data = self::fetchObject($object_id, $activity['object'], $ldactivity['as:object'], $trust_source);
if (empty($object_data)) { if (empty($object_data)) {
logger("Object data couldn't be processed", LOGGER_DEBUG); logger("Object data couldn't be processed", LOGGER_DEBUG);
return []; return [];
} }
// We had been able to retrieve the object data - so we can trust the source // We had been able to retrieve the object data - so we can trust the source
$trust_source = true; $trust_source = true;
} elseif (in_array($activity['type'], ['Like', 'Dislike'])) { } elseif (in_array($type, ['as:Like', 'as:Dislike'])) {
// Create a mostly empty array out of the activity data (instead of the object). // Create a mostly empty array out of the activity data (instead of the object).
// This way we later don't have to check for the existence of ech individual array element. // This way we later don't have to check for the existence of ech individual array element.
$object_data = self::processObject($activity); $object_data = self::processObject($ldactivity);
$object_data['name'] = $activity['type']; $object_data['name'] = $type;
$object_data['author'] = $activity['actor']; $object_data['author'] = JsonLD::fetchElement($ldactivity, 'as:actor');
$object_data['object'] = $object_id; $object_data['object'] = $object_id;
$object_data['object_type'] = ''; // Since we don't fetch the object, we don't know the type $object_data['object_type'] = ''; // Since we don't fetch the object, we don't know the type
} else { } else {
$object_data = []; $object_data = [];
$object_data['id'] = $activity['id']; $object_data['id'] = JsonLD::fetchElement($ldactivity, '@id');
$object_data['object'] = $activity['object']; $object_data['object'] = $activity['object'];
$object_data['object_type'] = JsonLD::fetchElement($activity, 'object', 'type'); $object_data['object_type'] = JsonLD::fetchElement($ldactivity, 'as:object', '@type');
} }
$object_data = self::addActivityFields($object_data, $activity); $object_data = self::addActivityFields($object_data, $activity);
@ -181,110 +191,115 @@ class Receiver
* @param integer $uid User ID * @param integer $uid User ID
* @param $trust_source * @param $trust_source
*/ */
public static function processActivity($activity, $body = '', $uid = null, $trust_source = false) public static function processActivity($activity, $ldactivity = '', $body = '', $uid = null, $trust_source = false)
{ {
if (empty($activity['type'])) { if (empty($ldactivity)) {
$ldactivity = JsonLD::compact($activity);
}
$type = JsonLD::fetchElement($ldactivity, '@type');
if (!$type) {
logger('Empty type', LOGGER_DEBUG); logger('Empty type', LOGGER_DEBUG);
return; return;
} }
if (empty($activity['object'])) { if (!JsonLD::fetchElement($ldactivity, 'as:object')) {
logger('Empty object', LOGGER_DEBUG); logger('Empty object', LOGGER_DEBUG);
return; return;
} }
if (empty($activity['actor'])) { if (!JsonLD::fetchElement($ldactivity, 'as:actor')) {
logger('Empty actor', LOGGER_DEBUG); logger('Empty actor', LOGGER_DEBUG);
return; return;
} }
// $trust_source is called by reference and is set to true if the content was retrieved successfully // $trust_source is called by reference and is set to true if the content was retrieved successfully
$object_data = self::prepareObjectData($activity, $uid, $trust_source); $object_data = self::prepareObjectData($activity, $ldactivity, $uid, $trust_source);
if (empty($object_data)) { if (empty($object_data)) {
logger('No object data found', LOGGER_DEBUG); logger('No object data found', LOGGER_DEBUG);
return; return;
} }
if (!$trust_source) { if (!$trust_source) {
logger('No trust for activity type "' . $activity['type'] . '", so we quit now.', LOGGER_DEBUG); logger('No trust for activity type "' . $type . '", so we quit now.', LOGGER_DEBUG);
return; return;
} }
switch ($activity['type']) { switch ($type) {
case 'Create': case 'as:Create':
case 'Announce': case 'as:Announce':
ActivityPub\Processor::createItem($object_data, $body); ActivityPub\Processor::createItem($object_data, $body);
break; break;
case 'Like': case 'as:Like':
ActivityPub\Processor::likeItem($object_data, $body); ActivityPub\Processor::likeItem($object_data, $body);
break; break;
case 'Dislike': case 'as:Dislike':
ActivityPub\Processor::dislikeItem($object_data, $body); ActivityPub\Processor::dislikeItem($object_data, $body);
break; break;
case 'Update': case 'as:Update':
if (in_array($object_data['object_type'], ActivityPub::CONTENT_TYPES)) { if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
/// @todo /// @todo
} elseif (in_array($object_data['object_type'], ActivityPub::ACCOUNT_TYPES)) { } elseif (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
ActivityPub\Processor::updatePerson($object_data, $body); ActivityPub\Processor::updatePerson($object_data, $body);
} }
break; break;
case 'Delete': case 'as:Delete':
if ($object_data['object_type'] == 'Tombstone') { if ($object_data['object_type'] == 'as:Tombstone') {
ActivityPub\Processor::deleteItem($object_data, $body); ActivityPub\Processor::deleteItem($object_data, $body);
} elseif (in_array($object_data['object_type'], ActivityPub::ACCOUNT_TYPES)) { } elseif (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
ActivityPub\Processor::deletePerson($object_data, $body); ActivityPub\Processor::deletePerson($object_data, $body);
} }
break; break;
case 'Follow': case 'as:Follow':
ActivityPub\Processor::followUser($object_data); ActivityPub\Processor::followUser($object_data);
break; break;
case 'Accept': case 'as:Accept':
if ($object_data['object_type'] == 'Follow') { if ($object_data['object_type'] == 'as:Follow') {
ActivityPub\Processor::acceptFollowUser($object_data); ActivityPub\Processor::acceptFollowUser($object_data);
} }
break; break;
case 'Reject': case 'as:Reject':
if ($object_data['object_type'] == 'Follow') { if ($object_data['object_type'] == 'as:Follow') {
ActivityPub\Processor::rejectFollowUser($object_data); ActivityPub\Processor::rejectFollowUser($object_data);
} }
break; break;
case 'Undo': case 'as:Undo':
if ($object_data['object_type'] == 'Follow') { if ($object_data['object_type'] == 'as:Follow') {
ActivityPub\Processor::undoFollowUser($object_data); ActivityPub\Processor::undoFollowUser($object_data);
} elseif (in_array($object_data['object_type'], ActivityPub::ACTIVITY_TYPES)) { } elseif (in_array($object_data['object_type'], self::ACTIVITY_TYPES)) {
ActivityPub\Processor::undoActivity($object_data); ActivityPub\Processor::undoActivity($object_data);
} }
break; break;
default: default:
logger('Unknown activity: ' . $activity['type'], LOGGER_DEBUG); logger('Unknown activity: ' . $type, LOGGER_DEBUG);
break; break;
} }
} }
/** /**
* * Fetch the receiver list from an activity array
* *
* @param array $activity * @param array $activity
* @param $actor * @param string $actor
* *
* @return * @return array with receivers (user id)
*/ */
private static function getReceivers($activity, $actor) private static function getReceivers($activity, $actor)
{ {
$receivers = []; $receivers = [];
// When it is an answer, we inherite the receivers from the parent // When it is an answer, we inherite the receivers from the parent
$replyto = JsonLD::fetchElement($activity, 'inReplyTo', 'id'); $replyto = JsonLD::fetchElement($activity, 'as:inReplyTo');
if (!empty($replyto)) { if (!empty($replyto)) {
$parents = Item::select(['uid'], ['uri' => $replyto]); $parents = Item::select(['uid'], ['uri' => $replyto]);
while ($parent = Item::fetch($parents)) { while ($parent = Item::fetch($parents)) {
@ -302,22 +317,18 @@ class Receiver
$followers = ''; $followers = '';
} }
foreach (['to', 'cc', 'bto', 'bcc'] as $element) { foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc'] as $element) {
if (empty($activity[$element])) { $receiver_list = JsonLD::fetchElementArray($activity, $element);
if (empty($receiver_list)) {
continue; continue;
} }
// The receiver can be an array or a string foreach ($receiver_list as $receiver) {
if (is_string($activity[$element])) { if ($receiver == self::PUBLIC_COLLECTION) {
$activity[$element] = [$activity[$element]];
}
foreach ($activity[$element] as $receiver) {
if ($receiver == ActivityPub::PUBLIC_COLLECTION) {
$receivers['uid:0'] = 0; $receivers['uid:0'] = 0;
} }
if (($receiver == ActivityPub::PUBLIC_COLLECTION) && !empty($actor)) { if (($receiver == self::PUBLIC_COLLECTION) && !empty($actor)) {
// This will most likely catch all OStatus connections to Mastodon // This will most likely catch all OStatus connections to Mastodon
$condition = ['alias' => [$actor, normalise_link($actor)], 'rel' => [Contact::SHARING, Contact::FRIEND] $condition = ['alias' => [$actor, normalise_link($actor)], 'rel' => [Contact::SHARING, Contact::FRIEND]
, 'archive' => false, 'pending' => false]; , 'archive' => false, 'pending' => false];
@ -330,7 +341,7 @@ class Receiver
DBA::close($contacts); DBA::close($contacts);
} }
if (in_array($receiver, [$followers, ActivityPub::PUBLIC_COLLECTION]) && !empty($actor)) { if (in_array($receiver, [$followers, self::PUBLIC_COLLECTION]) && !empty($actor)) {
$condition = ['nurl' => normalise_link($actor), 'rel' => [Contact::SHARING, Contact::FRIEND], $condition = ['nurl' => normalise_link($actor), 'rel' => [Contact::SHARING, Contact::FRIEND],
'network' => Protocol::ACTIVITYPUB, 'archive' => false, 'pending' => false]; 'network' => Protocol::ACTIVITYPUB, 'archive' => false, 'pending' => false];
$contacts = DBA::select('contact', ['uid'], $condition); $contacts = DBA::select('contact', ['uid'], $condition);
@ -453,9 +464,9 @@ class Receiver
* @param $object * @param $object
* @param $trust_source * @param $trust_source
* *
* @return * @return array with object data
*/ */
private static function fetchObject($object_id, $object = [], $trust_source = false) private static function fetchObject($object_id, $object = [], $ldobject = [], $trust_source = false)
{ {
if (!$trust_source || is_string($object)) { if (!$trust_source || is_string($object)) {
$data = ActivityPub::fetchContent($object_id); $data = ActivityPub::fetchContent($object_id);
@ -463,6 +474,7 @@ class Receiver
logger('Empty content for ' . $object_id . ', check if content is available locally.', LOGGER_DEBUG); logger('Empty content for ' . $object_id . ', check if content is available locally.', LOGGER_DEBUG);
$data = $object_id; $data = $object_id;
} else { } else {
$ldobject = JsonLD::compact($data);
logger('Fetched content for ' . $object_id, LOGGER_DEBUG); logger('Fetched content for ' . $object_id, LOGGER_DEBUG);
} }
} else { } else {
@ -478,6 +490,7 @@ class Receiver
} }
logger('Using already stored item for url ' . $object_id, LOGGER_DEBUG); logger('Using already stored item for url ' . $object_id, LOGGER_DEBUG);
$data = ActivityPub\Transmitter::createNote($item); $data = ActivityPub\Transmitter::createNote($item);
$ldobject = JsonLD::compact($data);
} }
if (empty($data['type'])) { if (empty($data['type'])) {
@ -486,7 +499,7 @@ class Receiver
} }
if (in_array($data['type'], ActivityPub::CONTENT_TYPES)) { if (in_array($data['type'], ActivityPub::CONTENT_TYPES)) {
return self::processObject($data); return self::processObject($ldobject);
} }
if ($data['type'] == 'Announce') { if ($data['type'] == 'Announce') {
@ -500,55 +513,107 @@ class Receiver
} }
/** /**
* * Convert tags from JSON-LD format into a simplified format
* *
* @param $object * @param array $tags Tags in JSON-LD format
* *
* @return * @return array with tags in a simplified format
*/
private static function processTags($tags)
{
$taglist = [];
foreach ($tags as $tag) {
$taglist[] = ['type' => str_replace('as:', '', JsonLD::fetchElement($tag, '@type')),
'href' => JsonLD::fetchElement($tag, 'as:href'),
'name' => JsonLD::fetchElement($tag, 'as:name')];
}
return $taglist;
}
/**
* Convert attachments from JSON-LD format into a simplified format
*
* @param array $attachments Attachments in JSON-LD format
*
* @return array with attachmants in a simplified format
*/
private static function processAttachments($attachments)
{
$attachlist = [];
foreach ($attachments as $attachment) {
$attachlist[] = ['type' => str_replace('as:', '', JsonLD::fetchElement($attachment, '@type')),
'mediaType' => JsonLD::fetchElement($attachment, 'as:mediaType'),
'name' => JsonLD::fetchElement($attachment, 'as:name'),
'url' => JsonLD::fetchElement($attachment, 'as:url')];
}
return $attachlist;
}
/**
* Fetches data from the object part of an activity
*
* @param array $object
*
* @return array
*/ */
private static function processObject($object) private static function processObject($object)
{ {
if (empty($object['id'])) { if (!JsonLD::fetchElement($object, '@id')) {
return false; return false;
} }
$object_data = []; $object_data = [];
$object_data['object_type'] = $object['type']; $object_data['object_type'] = JsonLD::fetchElement($object, '@type');
$object_data['id'] = $object['id']; $object_data['id'] = JsonLD::fetchElement($object, '@id');
if (!empty($object['inReplyTo'])) { $object_data['reply-to-id'] = JsonLD::fetchElement($object, 'as:inReplyTo');
$object_data['reply-to-id'] = JsonLD::fetchElement($object, 'inReplyTo', 'id');
} else { if (empty($object_data['reply-to-id'])) {
$object_data['reply-to-id'] = $object_data['id']; $object_data['reply-to-id'] = $object_data['id'];
} }
$object_data['published'] = defaults($object, 'published', null); $object_data['published'] = JsonLD::fetchElement($object, 'as:published', '@value');
$object_data['updated'] = defaults($object, 'updated', $object_data['published']); $object_data['updated'] = JsonLD::fetchElement($object, 'as:updated', '@value');
if (empty($object_data['updated'])) {
$object_data['updated'] = $object_data['published'];
}
if (empty($object_data['published']) && !empty($object_data['updated'])) { if (empty($object_data['published']) && !empty($object_data['updated'])) {
$object_data['published'] = $object_data['updated']; $object_data['published'] = $object_data['updated'];
} }
$actor = JsonLD::fetchElement($object, 'attributedTo', 'id'); $actor = JsonLD::fetchElement($object, 'as:attributedTo');
if (empty($actor)) { if (empty($actor)) {
$actor = defaults($object, 'actor', null); $actor = JsonLD::fetchElement($object, 'as:actor');
} }
$object_data['diaspora:guid'] = defaults($object, 'diaspora:guid', null); $object_data['diaspora:guid'] = JsonLD::fetchElement($object, 'diaspora:guid');
$object_data['diaspora:comment'] = JsonLD::fetchElement($object, 'diaspora:comment');
$object_data['owner'] = $object_data['author'] = $actor; $object_data['owner'] = $object_data['author'] = $actor;
$object_data['context'] = defaults($object, 'context', null); $object_data['context'] = JsonLD::fetchElement($object, 'as:context');
$object_data['conversation'] = defaults($object, 'conversation', null); $object_data['conversation'] = JsonLD::fetchElement($object, 'ostatus:conversation');
$object_data['sensitive'] = defaults($object, 'sensitive', null); $object_data['sensitive'] = JsonLD::fetchElement($object, 'as:sensitive');
$object_data['name'] = defaults($object, 'title', null); $object_data['name'] = JsonLD::fetchElement($object, 'as:name');
$object_data['name'] = defaults($object, 'name', $object_data['name']); $object_data['summary'] = JsonLD::fetchElement($object, 'as:summary');
$object_data['summary'] = defaults($object, 'summary', null); $object_data['content'] = JsonLD::fetchElement($object, 'as:content');
$object_data['content'] = defaults($object, 'content', null); $object_data['source'] = JsonLD::fetchElement($object, 'as:source', 'as:content', 'as:mediaType', 'text/bbcode');
$object_data['source'] = defaults($object, 'source', null); $object_data['location'] = JsonLD::fetchElement($object, 'as:location', 'as:name', '@type', 'as:Place');
$object_data['location'] = JsonLD::fetchElement($object, 'location', 'name', 'type', 'Place'); $object_data['attachments'] = self::processAttachments(JsonLD::fetchElementArray($object, 'as:attachment'));
$object_data['attachments'] = defaults($object, 'attachment', null); $object_data['tags'] = self::processTags(JsonLD::fetchElementArray($object, 'as:tag'));
$object_data['tags'] = defaults($object, 'tag', null); // $object_data['service'] = JsonLD::fetchElement($object, 'instrument', 'name', 'type', 'Service'); // todo
$object_data['service'] = JsonLD::fetchElement($object, 'instrument', 'name', 'type', 'Service'); $object_data['service'] = null;
$object_data['alternate-url'] = JsonLD::fetchElement($object, 'url', 'href'); $object_data['alternate-url'] = JsonLD::fetchElement($object, 'as:url');
// Special treatment for Hubzilla links
if (is_array($object_data['alternate-url'])) {
if (!empty($object['as:url'])) {
$object_data['alternate-url'] = JsonLD::fetchElement($object['as:url'], 'as:href');
} else {
$object_data['alternate-url'] = null;
}
}
$object_data['receiver'] = self::getReceivers($object, $object_data['owner']); $object_data['receiver'] = self::getReceivers($object, $object_data['owner']);
// Common object data: // Common object data:

4
src/Protocol/ActivityPub/Transmitter.php
View file

@ -29,6 +29,10 @@ use Friendica\Core\Cache;
* *
* To-Do: * To-Do:
* *
* Missing object fields:
* - service (App)
* - location
*
* Missing object types: * Missing object types:
* - Event * - Event
* *

88
src/Util/JsonLD.php
View file

@ -82,10 +82,13 @@ class JsonLD
{ {
jsonld_set_document_loader('Friendica\Util\JsonLD::documentLoader'); jsonld_set_document_loader('Friendica\Util\JsonLD::documentLoader');
$context = (object)['as' => 'https://www.w3.org/ns/activitystreams', $context = (object)['as' => 'https://www.w3.org/ns/activitystreams#',
'w3sec' => 'https://w3id.org/security', 'w3id' => 'https://w3id.org/security#',
'ostatus' => (object)['@id' => 'http://ostatus.org#', '@type' => '@id'],
'vcard' => (object)['@id' => 'http://www.w3.org/2006/vcard/ns#', '@type' => '@id'], 'vcard' => (object)['@id' => 'http://www.w3.org/2006/vcard/ns#', '@type' => '@id'],
'ostatus' => (object)['@id' => 'http://ostatus.org#', '@type' => '@id'],
'diaspora' => (object)['@id' => 'https://diasporafoundation.org/ns/', '@type' => '@id'],
'dc' => (object)['@id' => 'http://purl.org/dc/terms/', '@type' => '@id'],
'dc' => (object)['@id' => 'http://purl.org/dc/terms/', '@type' => '@id'],
'uuid' => (object)['@id' => 'http://schema.org/identifier', '@type' => '@id']]; 'uuid' => (object)['@id' => 'http://schema.org/identifier', '@type' => '@id']];
$jsonobj = json_decode(json_encode($json, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE)); $jsonobj = json_decode(json_encode($json, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
@ -95,6 +98,45 @@ class JsonLD
return json_decode(json_encode($compacted, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE), true); return json_decode(json_encode($compacted, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE), true);
} }
/**
* @brief Fetches an element array from a JSON array
*
* @param $array
* @param $element
* @param $key
*
* @return fetched element array
*/
public static function fetchElementArray($array, $element, $key = '@id')
{
if (empty($array)) {
return null;
}
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[] = $entry;
} elseif (!empty($entry[$key])) {
$elements[] = $entry[$key];
} else {
$elements[] = $entry;
}
}
return $elements;
}
/** /**
* @brief Fetches an element from a JSON array * @brief Fetches an element from a JSON array
* *
@ -106,38 +148,40 @@ class JsonLD
* *
* @return fetched element * @return fetched element
*/ */
public static function fetchElement($array, $element, $key, $type = null, $type_value = null) public static function fetchElement($array, $element, $key = '@id', $type = null, $type_value = null)
{ {
if (empty($array)) { if (empty($array)) {
return false; return null;
} }
if (empty($array[$element])) { if (!isset($array[$element])) {
return false; return null;
} }
if (is_string($array[$element])) { if (!is_array($array[$element])) {
return $array[$element]; return $array[$element];
} }
if (is_null($type_value)) { if (is_null($type) || is_null($type_value)) {
if (!empty($array[$element][$key])) { $element_array = self::fetchElementArray($array, $element, $key);
return $array[$element][$key]; if (is_null($element_array)) {
return null;
} }
if (!empty($array[$element][0][$key])) { return array_shift($element_array);
return $array[$element][0][$key]; }
$element_array = self::fetchElementArray($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 false;
} }
if (!empty($array[$element][$key]) && !empty($array[$element][$type]) && ($array[$element][$type] == $type_value)) { return null;
return $array[$element][$key];
}
/// @todo Add array search
return false;
} }
} }