263 lines
7.9 KiB
PHP
263 lines
7.9 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2020, Friendica
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Protocol;
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use Friendica\Core\Protocol;
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use Friendica\Database\DBA;
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use Friendica\DI;
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use Friendica\Model\APContact;
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use Friendica\Model\User;
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use Friendica\Util\HTTPSignature;
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use Friendica\Util\JsonLD;
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/**
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* ActivityPub Protocol class
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*
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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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*
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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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*
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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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* 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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* To-do:
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* - Polling the outboxes for missing content?
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*
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* Missing parts from DFRN:
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* - Public Forum
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* - Private Forum
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* - Relocation
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*/
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class ActivityPub
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{
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const PUBLIC_COLLECTION = 'https://www.w3.org/ns/activitystreams#Public';
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const CONTEXT = ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
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['vcard' => 'http://www.w3.org/2006/vcard/ns#',
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'dfrn' => 'http://purl.org/macgirvin/dfrn/1.0/',
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'diaspora' => 'https://diasporafoundation.org/ns/',
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'litepub' => 'http://litepub.social/ns#',
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'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
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'sensitive' => 'as:sensitive', 'Hashtag' => 'as:Hashtag',
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'directMessage' => 'litepub:directMessage']];
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const ACCOUNT_TYPES = ['Person', 'Organization', 'Service', 'Group', 'Application'];
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/**
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* Checks if the web request is done for the AP protocol
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*
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* @return bool is it AP?
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*/
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public static function isRequest()
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{
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return stristr($_SERVER['HTTP_ACCEPT'] ?? '', 'application/activity+json') ||
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stristr($_SERVER['HTTP_ACCEPT'] ?? '', 'application/ld+json');
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}
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/**
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* Fetches ActivityPub content from the given url
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*
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* @param string $url content url
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* @param integer $uid User ID for the signature
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* @return array
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function fetchContent(string $url, int $uid = 0)
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{
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if (empty($uid)) {
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$user = User::getFirstAdmin(['uid']);
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if (empty($user['uid'])) {
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// When the system setup is missing an admin we just take the first user
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$condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
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$user = DBA::selectFirst('user', ['uid'], $condition);
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}
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if (!empty($user['uid'])) {
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$uid = $user['uid'];
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}
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}
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return HTTPSignature::fetch($url, $uid);
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}
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private static function getAccountType($apcontact)
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{
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$accounttype = -1;
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switch($apcontact['type']) {
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case 'Person':
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$accounttype = User::ACCOUNT_TYPE_PERSON;
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break;
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case 'Organization':
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$accounttype = User::ACCOUNT_TYPE_ORGANISATION;
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break;
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case 'Service':
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$accounttype = User::ACCOUNT_TYPE_NEWS;
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break;
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case 'Group':
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$accounttype = User::ACCOUNT_TYPE_COMMUNITY;
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break;
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case 'Application':
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$accounttype = User::ACCOUNT_TYPE_RELAY;
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break;
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}
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return $accounttype;
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}
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/**
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* Fetches a profile from the given url into an array that is compatible to Probe::uri
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*
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* @param string $url profile url
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* @param boolean $update Update the profile
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* @return array
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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* @throws \ImagickException
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*/
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public static function probeProfile($url, $update = true)
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{
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$apcontact = APContact::getByURL($url, $update);
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if (empty($apcontact)) {
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return [];
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}
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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['following'] = $apcontact['following'];
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$profile['followers'] = $apcontact['followers'];
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$profile['inbox'] = $apcontact['inbox'];
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$profile['outbox'] = $apcontact['outbox'];
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$profile['sharedinbox'] = $apcontact['sharedinbox'];
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$profile['photo'] = $apcontact['photo'];
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$profile['account-type'] = self::getAccountType($apcontact);
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$profile['community'] = ($profile['account-type'] == User::ACCOUNT_TYPE_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['subscribe'] = $apcontact['subscribe'];
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$profile['baseurl'] = $apcontact['baseurl'];
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$profile['gsid'] = $apcontact['gsid'];
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// Remove all "null" fields
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foreach ($profile as $field => $content) {
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if (is_null($content)) {
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unset($profile[$field]);
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}
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}
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return $profile;
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}
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/**
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* Fetches activities from the outbox of a given profile and processes it
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*
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* @param string $url
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* @param integer $uid User ID
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function fetchOutbox($url, $uid)
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{
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$data = self::fetchContent($url, $uid);
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if (empty($data)) {
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return;
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}
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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'], $uid);
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return;
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} else {
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$items = [];
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}
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foreach ($items as $activity) {
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$ldactivity = JsonLD::compact($activity);
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ActivityPub\Receiver::processActivity($ldactivity, '', $uid, true);
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}
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}
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/**
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* Fetch items from AP endpoints
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*
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* @param string $url Address of the endpoint
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* @param integer $uid Optional user id
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* @return array Endpoint items
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*/
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public static function fetchItems(string $url, int $uid = 0)
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{
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$data = self::fetchContent($url, $uid);
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if (empty($data)) {
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return [];
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}
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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']) && is_string($data['first']) && ($data['first'] != $url)) {
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return self::fetchItems($data['first'], $uid);
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} else {
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return [];
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}
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if (!empty($data['next']) && is_string($data['next'])) {
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$items = array_merge($items, self::fetchItems($data['next'], $uid));
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}
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return $items;
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}
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/**
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* Checks if the given contact url does support ActivityPub
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*
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* @param string $url profile url
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* @param boolean $update true = always update, false = never update, null = update when not found or outdated
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* @return boolean
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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* @throws \ImagickException
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*/
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public static function isSupportedByContactUrl($url, $update = null)
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{
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return !empty(APContact::getByURL($url, $update));
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}
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}
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