src/Module/Objects.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Module;
  23
  24 use Friendica\BaseModule;
  25 use Friendica\Core\System;
  26 use Friendica\Database\DBA;
  27 use Friendica\DI;
  28 use Friendica\Model\Contact;
  29 use Friendica\Model\Item;
  30 use Friendica\Network\HTTPException;
  31 use Friendica\Protocol\ActivityPub;
  32 use Friendica\Util\HTTPSignature;
  33 use Friendica\Util\Network;
  34
  35 /**
  36  * ActivityPub Objects
  37  */
  38 class Objects extends BaseModule
  39 {
  40         public static function rawContent(array $parameters = [])
  41         {
  42                 if (empty($parameters['guid'])) {
  43                         throw new HTTPException\BadRequestException();
  44                 }
  45
  46                 if (!ActivityPub::isRequest()) {
  47                         DI::baseUrl()->redirect(str_replace('objects/', 'display/', DI::args()->getQueryString()));
  48                 }
  49
  50                 $item = Item::selectFirst(['id', 'uid', 'origin', 'author-link', 'changed', 'private', 'psid'],
  51                         ['guid' => $parameters['guid']], ['order' => ['origin' => true]]);
  52
  53                 $validated = false;
  54                 $requester = HTTPSignature::getSigner('', $_SERVER);
  55                 if (!empty($requester) && $item['origin']) {
  56                         $requester_id = Contact::getIdForURL($requester, $item['uid']);
  57                         if (!empty($requester_id)) {
  58                                 $permissionSets = DI::permissionSet()->selectByContactId($requester_id, $item['uid']);
  59                                 if (!empty($permissionSets)) {
  60                                         $psid = array_merge($permissionSets->column('id'),
  61                                                 [DI::permissionSet()->getIdFromACL($item['uid'], '', '', '', '')]);
  62                                         $validated = in_array($item['psid'], $psid);
  63                                 }
  64                         }
  65                 }
  66
  67                 if (!$validated && !in_array($item['private'], [Item::PUBLIC, Item::UNLISTED])) {
  68                         unset($item);
  69                 }
  70
  71                 // Valid items are original post or posted from this node (including in the case of a forum)
  72                 if (!DBA::isResult($item) || !$item['origin'] && (parse_url($item['author-link'], PHP_URL_HOST) != parse_url(DI::baseUrl()->get(), PHP_URL_HOST))) {
  73                         throw new HTTPException\NotFoundException();
  74                 }
  75
  76                 $etag          = md5($parameters['guid'] . '-' . $item['changed']);
  77                 $last_modified = $item['changed'];
  78                 Network::checkEtagModified($etag, $last_modified);
  79
  80                 if (empty($parameters['activity'])) {
  81                         $activity = ActivityPub\Transmitter::createActivityFromItem($item['id'], true);
  82                         $activity['type'] = $activity['type'] == 'Update' ? 'Create' : $activity['type'];
  83
  84                         // Only display "Create" activity objects here, no reshares or anything else
  85                         if (empty($activity['object']) || ($activity['type'] != 'Create')) {
  86                                 throw new HTTPException\NotFoundException();
  87                         }
  88
  89                         $data = ['@context' => ActivityPub::CONTEXT];
  90                         $data = array_merge($data, $activity['object']);
  91                 } elseif (in_array($parameters['activity'], ['Create', 'Announce', 'Update',
  92                         'Like', 'Dislike', 'Accept', 'Reject', 'TentativeAccept', 'Follow', 'Add'])) {
  93                         $data = ActivityPub\Transmitter::createActivityFromItem($item['id']);
  94                         if (empty($data)) {
  95                                 throw new HTTPException\NotFoundException();
  96                         }
  97                         if ($parameters['activity'] != 'Create') {
  98                                 $data['type'] = $parameters['activity'];
  99                                 $data['id'] = str_replace('/Create', '/' . $parameters['activity'], $data['id']);
 100                         }
 101                 } else {
 102                         throw new HTTPException\NotFoundException();
 103                 }
 104
 105                 // Relaxed CORS header for public items
 106                 header('Access-Control-Allow-Origin: *');
 107                 System::jsonExit($data, 'application/activity+json');
 108         }
 109 }