2018-09-10 21:07:25 +00:00
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<?php
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/**
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* @file src/Protocol/ActivityPub.php
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*/
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namespace Friendica\Protocol;
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use Friendica\Util\Network;
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use Friendica\Core\Protocol;
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2018-09-26 17:24:29 +00:00
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use Friendica\Model\APContact;
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2018-09-10 21:07:25 +00:00
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/**
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* @brief ActivityPub Protocol class
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* The ActivityPub Protocol is a message exchange protocol defined by the W3C.
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* https://www.w3.org/TR/activitypub/
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* https://www.w3.org/TR/activitystreams-core/
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* https://www.w3.org/TR/activitystreams-vocabulary/
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*
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* https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
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* https://blog.joinmastodon.org/2018/07/how-to-make-friends-and-verify-requests/
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2018-09-12 06:01:28 +00:00
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*
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* Digest: https://tools.ietf.org/html/rfc5843
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* https://tools.ietf.org/html/draft-cavage-http-signatures-10#ref-15
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2018-09-15 18:54:45 +00:00
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*
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2018-09-23 17:29:31 +00:00
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* Mastodon implementation of supported activities:
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* https://github.com/tootsuite/mastodon/blob/master/app/lib/activitypub/activity.rb#L26
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*
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2018-10-04 05:29:22 +00:00
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* Funkwhale:
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* http://docs-funkwhale-funkwhale-549-music-federation-documentation.preview.funkwhale.audio/federation/index.html
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*
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2018-09-15 10:14:56 +00:00
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* To-do:
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2018-09-23 17:29:31 +00:00
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* - Polling the outboxes for missing content?
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2018-09-10 21:07:25 +00:00
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*/
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class ActivityPub
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{
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2018-09-28 15:25:20 +00:00
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const PUBLIC_COLLECTION = 'https://www.w3.org/ns/activitystreams#Public';
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2018-09-23 17:29:31 +00:00
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const CONTEXT = ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
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2018-09-26 22:45:13 +00:00
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['vcard' => 'http://www.w3.org/2006/vcard/ns#',
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2018-09-27 11:39:17 +00:00
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'diaspora' => 'https://diasporafoundation.org/ns/',
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2018-09-26 20:03:46 +00:00
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'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
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'sensitive' => 'as:sensitive', 'Hashtag' => 'as:Hashtag']];
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2018-09-30 20:26:30 +00:00
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const ACCOUNT_TYPES = ['Person', 'Organization', 'Service', 'Group', 'Application'];
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2018-09-26 21:38:37 +00:00
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/**
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2018-10-06 04:18:40 +00:00
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* Checks if the web request is done for the AP protocol
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2018-09-26 21:38:37 +00:00
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*
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* @return is it AP?
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*/
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2018-09-16 20:12:48 +00:00
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public static function isRequest()
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{
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return stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/activity+json') ||
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stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/ld+json');
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}
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2018-09-10 21:07:25 +00:00
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/**
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2018-10-03 09:15:38 +00:00
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* Fetches ActivityPub content from the given url
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2018-09-26 21:38:37 +00:00
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*
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2018-10-03 09:15:38 +00:00
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* @param string $url content url
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* @return array
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2018-09-26 21:38:37 +00:00
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*/
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2018-10-03 09:15:38 +00:00
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public static function fetchContent($url)
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2018-09-10 21:07:25 +00:00
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{
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2018-10-10 19:08:43 +00:00
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$curlResult = Network::curl($url, false, $redirects, ['accept_content' => 'application/activity+json, application/ld+json']);
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if (!$curlResult->isSuccess() || empty($curlResult->getBody())) {
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2018-09-10 21:07:25 +00:00
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return false;
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}
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2018-10-18 05:54:44 +00:00
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$content = json_decode($curlResult->getBody(), true);
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if (empty($content) || !is_array($content)) {
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return false;
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}
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return $content;
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2018-09-14 21:10:49 +00:00
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}
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2018-09-26 21:38:37 +00:00
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/**
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2018-10-03 09:15:38 +00:00
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* Fetches a profile from the given url into an array that is compatible to Probe::uri
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2018-09-26 21:38:37 +00:00
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*
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2018-10-03 09:15:38 +00:00
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* @param string $url profile url
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* @return array
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2018-09-26 21:38:37 +00:00
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*/
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2018-10-03 09:15:38 +00:00
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public static function probeProfile($url)
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2018-09-14 21:10:49 +00:00
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{
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2018-10-03 09:15:38 +00:00
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$apcontact = APContact::getByURL($url, true);
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if (empty($apcontact)) {
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return false;
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2018-09-14 21:10:49 +00:00
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}
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2018-10-03 09:15:38 +00:00
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$profile = ['network' => Protocol::ACTIVITYPUB];
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$profile['nick'] = $apcontact['nick'];
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$profile['name'] = $apcontact['name'];
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$profile['guid'] = $apcontact['uuid'];
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$profile['url'] = $apcontact['url'];
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$profile['addr'] = $apcontact['addr'];
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$profile['alias'] = $apcontact['alias'];
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$profile['photo'] = $apcontact['photo'];
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// $profile['community']
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// $profile['keywords']
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// $profile['location']
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$profile['about'] = $apcontact['about'];
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$profile['batch'] = $apcontact['sharedinbox'];
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$profile['notify'] = $apcontact['inbox'];
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$profile['poll'] = $apcontact['outbox'];
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$profile['pubkey'] = $apcontact['pubkey'];
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$profile['baseurl'] = $apcontact['baseurl'];
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2018-09-14 21:10:49 +00:00
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2018-10-03 09:15:38 +00:00
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// Remove all "null" fields
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foreach ($profile as $field => $content) {
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if (is_null($content)) {
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unset($profile[$field]);
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2018-09-14 21:10:49 +00:00
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}
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}
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2018-10-03 09:15:38 +00:00
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return $profile;
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2018-09-16 09:06:09 +00:00
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}
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2018-09-26 21:38:37 +00:00
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/**
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2018-10-06 04:18:40 +00:00
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* Fetches activities from the outbox of a given profile and processes it
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2018-09-26 21:38:37 +00:00
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*
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2018-10-06 04:18:40 +00:00
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* @param string $url
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2018-10-03 09:15:38 +00:00
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* @param integer $uid User ID
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2018-09-30 20:26:30 +00:00
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*/
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2018-10-03 09:15:38 +00:00
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public static function fetchOutbox($url, $uid)
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2018-09-30 20:26:30 +00:00
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{
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2018-10-03 09:15:38 +00:00
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$data = self::fetchContent($url);
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if (empty($data)) {
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2018-09-30 20:26:30 +00:00
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return;
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}
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2018-10-03 09:15:38 +00:00
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if (!empty($data['orderedItems'])) {
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$items = $data['orderedItems'];
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} elseif (!empty($data['first']['orderedItems'])) {
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$items = $data['first']['orderedItems'];
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} elseif (!empty($data['first'])) {
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self::fetchOutbox($data['first'], $uid);
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2018-09-30 20:26:30 +00:00
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return;
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} else {
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2018-10-03 09:15:38 +00:00
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$items = [];
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2018-09-15 18:54:45 +00:00
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}
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2018-10-03 09:15:38 +00:00
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foreach ($items as $activity) {
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2018-10-07 17:17:06 +00:00
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$ldactivity = JsonLD::compact($activity);
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ActivityPub\Receiver::processActivity($ldactivity, '', $uid, true);
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2018-09-15 18:54:45 +00:00
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}
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}
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2018-09-10 21:07:25 +00:00
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}
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