src/Protocol/ActivityPub.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub.php
   4  */
   5 namespace Friendica\Protocol;
   6
   7 use Friendica\Database\DBA;
   8 use Friendica\Core\System;
   9 use Friendica\BaseObject;
  10 use Friendica\Util\Network;
  11 use Friendica\Util\HTTPSignature;
  12 use Friendica\Core\Protocol;
  13 use Friendica\Model\Conversation;
  14 use Friendica\Model\Contact;
  15 use Friendica\Model\APContact;
  16 use Friendica\Model\Item;
  17 use Friendica\Model\Profile;
  18 use Friendica\Model\Term;
  19 use Friendica\Model\User;
  20 use Friendica\Util\DateTimeFormat;
  21 use Friendica\Util\Crypto;
  22 use Friendica\Content\Text\BBCode;
  23 use Friendica\Content\Text\HTML;
  24 use Friendica\Util\JsonLD;
  25 use Friendica\Util\LDSignature;
  26 use Friendica\Core\Config;
  27
  28 /**
  29  * @brief ActivityPub Protocol class
  30  * The ActivityPub Protocol is a message exchange protocol defined by the W3C.
  31  * https://www.w3.org/TR/activitypub/
  32  * https://www.w3.org/TR/activitystreams-core/
  33  * https://www.w3.org/TR/activitystreams-vocabulary/
  34  *
  35  * https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
  36  * https://blog.joinmastodon.org/2018/07/how-to-make-friends-and-verify-requests/
  37  *
  38  * Digest: https://tools.ietf.org/html/rfc5843
  39  * https://tools.ietf.org/html/draft-cavage-http-signatures-10#ref-15
  40  *
  41  * Mastodon implementation of supported activities:
  42  * https://github.com/tootsuite/mastodon/blob/master/app/lib/activitypub/activity.rb#L26
  43  *
  44  * To-do:
  45  *
  46  * Receiver:
  47  * - Update (Image, Video, Article, Note)
  48  * - Event
  49  * - Undo Announce
  50  *
  51  * Check what this is meant to do:
  52  * - Add
  53  * - Block
  54  * - Flag
  55  * - Remove
  56  * - Undo Block
  57  * - Undo Accept (Problem: This could invert a contact accept or an event accept)
  58  *
  59  * Transmitter:
  60  * - Event
  61  *
  62  * Complicated:
  63  * - Announce
  64  * - Undo Announce
  65  *
  66  * General:
  67  * - Attachments
  68  * - nsfw (sensitive)
  69  * - Queueing unsucessful deliveries
  70  * - Polling the outboxes for missing content?
  71  * - Possibly using the LD-JSON parser
  72  */
  73 class ActivityPub
  74 {
  75         const PUBLIC_COLLECTION = 'https://www.w3.org/ns/activitystreams#Public';
  76         const CONTEXT = ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
  77                 ['vcard' => 'http://www.w3.org/2006/vcard/ns#',
  78                 'diaspora' => 'https://diasporafoundation.org/ns/',
  79                 'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
  80                 'sensitive' => 'as:sensitive', 'Hashtag' => 'as:Hashtag']];
  81         const ACCOUNT_TYPES = ['Person', 'Organization', 'Service', 'Group', 'Application'];
  82         const CONTENT_TYPES = ['Note', 'Article', 'Video', 'Image'];
  83         const ACTIVITY_TYPES = ['Like', 'Dislike', 'Accept', 'Reject', 'TentativeAccept'];
  84         /**
  85          * @brief Checks if the web request is done for the AP protocol
  86          *
  87          * @return is it AP?
  88          */
  89         public static function isRequest()
  90         {
  91                 return stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/activity+json') ||
  92                         stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/ld+json');
  93         }
  94
  95         /**
  96          * Fetches ActivityPub content from the given url
  97          *
  98          * @param string $url content url
  99          * @return array
 100          */
 101         public static function fetchContent($url)
 102         {
 103                 $ret = Network::curl($url, false, $redirects, ['accept_content' => 'application/activity+json, application/ld+json']);
 104                 if (!$ret['success'] || empty($ret['body'])) {
 105                         return false;
 106                 }
 107
 108                 return json_decode($ret['body'], true);
 109         }
 110
 111         /**
 112          * Fetches a profile from the given url into an array that is compatible to Probe::uri
 113          *
 114          * @param string $url profile url
 115          * @return array
 116          */
 117         public static function probeProfile($url)
 118         {
 119                 $apcontact = APContact::getByURL($url, true);
 120                 if (empty($apcontact)) {
 121                         return false;
 122                 }
 123
 124                 $profile = ['network' => Protocol::ACTIVITYPUB];
 125                 $profile['nick'] = $apcontact['nick'];
 126                 $profile['name'] = $apcontact['name'];
 127                 $profile['guid'] = $apcontact['uuid'];
 128                 $profile['url'] = $apcontact['url'];
 129                 $profile['addr'] = $apcontact['addr'];
 130                 $profile['alias'] = $apcontact['alias'];
 131                 $profile['photo'] = $apcontact['photo'];
 132                 // $profile['community']
 133                 // $profile['keywords']
 134                 // $profile['location']
 135                 $profile['about'] = $apcontact['about'];
 136                 $profile['batch'] = $apcontact['sharedinbox'];
 137                 $profile['notify'] = $apcontact['inbox'];
 138                 $profile['poll'] = $apcontact['outbox'];
 139                 $profile['pubkey'] = $apcontact['pubkey'];
 140                 $profile['baseurl'] = $apcontact['baseurl'];
 141
 142                 // Remove all "null" fields
 143                 foreach ($profile as $field => $content) {
 144                         if (is_null($content)) {
 145                                 unset($profile[$field]);
 146                         }
 147                 }
 148
 149                 return $profile;
 150         }
 151
 152         /**
 153          * @brief
 154          *
 155          * @param $url
 156          * @param integer $uid User ID
 157          */
 158         public static function fetchOutbox($url, $uid)
 159         {
 160                 $data = self::fetchContent($url);
 161                 if (empty($data)) {
 162                         return;
 163                 }
 164
 165                 if (!empty($data['orderedItems'])) {
 166                         $items = $data['orderedItems'];
 167                 } elseif (!empty($data['first']['orderedItems'])) {
 168                         $items = $data['first']['orderedItems'];
 169                 } elseif (!empty($data['first'])) {
 170                         self::fetchOutbox($data['first'], $uid);
 171                         return;
 172                 } else {
 173                         $items = [];
 174                 }
 175
 176                 foreach ($items as $activity) {
 177                         ActivityPub\Receiver::processActivity($activity, '', $uid, true);
 178                 }
 179         }
 180 }