Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @file src/Protocol/ActivityPub.php
*/
namespace Friendica\Protocol;
use Friendica\Util\Network;
use Friendica\Core\Protocol;
use Friendica\Model\APContact;
/**
* @brief ActivityPub Protocol class
* The ActivityPub Protocol is a message exchange protocol defined by the W3C.
* https://www.w3.org/TR/activitypub/
* https://www.w3.org/TR/activitystreams-core/
* https://www.w3.org/TR/activitystreams-vocabulary/
*
* https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
* https://blog.joinmastodon.org/2018/07/how-to-make-friends-and-verify-requests/
*
* Digest: https://tools.ietf.org/html/rfc5843
* https://tools.ietf.org/html/draft-cavage-http-signatures-10#ref-15
*
* Mastodon implementation of supported activities:
* https://github.com/tootsuite/mastodon/blob/master/app/lib/activitypub/activity.rb#L26
*
* Funkwhale:
* http://docs-funkwhale-funkwhale-549-music-federation-documentation.preview.funkwhale.audio/federation/index.html
*
* To-do:
* - Polling the outboxes for missing content?
*/
class ActivityPub
{
const PUBLIC_COLLECTION = 'https://www.w3.org/ns/activitystreams#Public';
const CONTEXT = ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
['vcard' => 'http://www.w3.org/2006/vcard/ns#',
'diaspora' => 'https://diasporafoundation.org/ns/',
'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
'sensitive' => 'as:sensitive', 'Hashtag' => 'as:Hashtag']];
const ACCOUNT_TYPES = ['Person', 'Organization', 'Service', 'Group', 'Application'];
/**
* Checks if the web request is done for the AP protocol
*
* @return is it AP?
*/
public static function isRequest()
{
return stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/activity+json') ||
stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/ld+json');
}
/**
* Fetches ActivityPub content from the given url
*
* @param string $url content url
* @return array
*/
public static function fetchContent($url)
{
$ret = Network::curl($url, false, $redirects, ['accept_content' => 'application/activity+json, application/ld+json']);
if (!$ret['success'] || empty($ret['body'])) {
return false;
}
return json_decode($ret['body'], true);
}
/**
* Fetches a profile from the given url into an array that is compatible to Probe::uri
*
* @param string $url profile url
* @return array
*/
public static function probeProfile($url)
{
$apcontact = APContact::getByURL($url, true);
if (empty($apcontact)) {
return false;
}
$profile = ['network' => Protocol::ACTIVITYPUB];
$profile['nick'] = $apcontact['nick'];
$profile['name'] = $apcontact['name'];
$profile['guid'] = $apcontact['uuid'];
$profile['url'] = $apcontact['url'];
$profile['addr'] = $apcontact['addr'];
$profile['alias'] = $apcontact['alias'];
$profile['photo'] = $apcontact['photo'];
// $profile['community']
// $profile['keywords']
// $profile['location']
$profile['about'] = $apcontact['about'];
$profile['batch'] = $apcontact['sharedinbox'];
$profile['notify'] = $apcontact['inbox'];
$profile['poll'] = $apcontact['outbox'];
$profile['pubkey'] = $apcontact['pubkey'];
$profile['baseurl'] = $apcontact['baseurl'];
// Remove all "null" fields
foreach ($profile as $field => $content) {
if (is_null($content)) {
unset($profile[$field]);
}
}
return $profile;
}
/**
* Fetches activities from the outbox of a given profile and processes it
*
* @param string $url
* @param integer $uid User ID
*/
public static function fetchOutbox($url, $uid)
{
$data = self::fetchContent($url);
if (empty($data)) {
return;
}
if (!empty($data['orderedItems'])) {
$items = $data['orderedItems'];
} elseif (!empty($data['first']['orderedItems'])) {
$items = $data['first']['orderedItems'];
} elseif (!empty($data['first'])) {
self::fetchOutbox($data['first'], $uid);
return;
} else {
$items = [];
}
foreach ($items as $activity) {
$ldactivity = JsonLD::compact($activity);
ActivityPub\Receiver::processActivity($ldactivity, '', $uid, true);
}
}
}