src/Module/ActivityPub/Objects.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2023, the Friendica project
   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\ActivityPub;
  23
  24 use Friendica\BaseModule;
  25 use Friendica\Core\Logger;
  26 use Friendica\Core\System;
  27 use Friendica\Database\DBA;
  28 use Friendica\DI;
  29 use Friendica\Model\Contact;
  30 use Friendica\Model\Item;
  31 use Friendica\Model\Post;
  32 use Friendica\Network\HTTPException;
  33 use Friendica\Protocol\ActivityPub;
  34 use Friendica\Util\HTTPSignature;
  35 use Friendica\Util\Network;
  36 use Friendica\Util\Strings;
  37
  38 /**
  39  * ActivityPub Objects
  40  */
  41 class Objects extends BaseModule
  42 {
  43         protected function rawContent(array $request = [])
  44         {
  45                 if (empty($this->parameters['guid'])) {
  46                         throw new HTTPException\BadRequestException();
  47                 }
  48
  49                 header('Vary: Accept', false);
  50
  51                 if (!ActivityPub::isRequest()) {
  52                         DI::baseUrl()->redirect(str_replace('objects/', 'display/', DI::args()->getQueryString()));
  53                 }
  54
  55                 $itemuri = DBA::selectFirst('item-uri', ['id'], ['guid' => $this->parameters['guid']]);
  56
  57                 if (DBA::isResult($itemuri)) {
  58                         Logger::info('Provided GUID found.', ['guid' => $this->parameters['guid'], 'uri-id' => $itemuri['id']]);
  59                 } else {
  60                         // The item URI does not always contain the GUID. This means that we have to search the URL instead
  61                         $url = DI::baseUrl() . '/' . DI::args()->getQueryString();
  62                         $nurl = Strings::normaliseLink($url);
  63                         $ssl_url = str_replace('http://', 'https://', $nurl);
  64
  65                         $itemuri = DBA::selectFirst('item-uri', ['guid', 'id'], ['uri' => [$url, $nurl, $ssl_url]]);
  66                         if (DBA::isResult($itemuri)) {
  67                                 Logger::info('URL found.', ['url' => $url, 'guid' => $itemuri['guid'], 'uri-id' => $itemuri['id']]);
  68                         } else {
  69                                 Logger::info('URL not found.', ['url' => $url]);
  70                                 throw new HTTPException\NotFoundException();
  71                         }
  72                 }
  73
  74                 $item = Post::selectFirst([], ['uri-id' => $itemuri['id'], 'origin' => true]);
  75                 if (!DBA::isResult($item)) {
  76                         throw new HTTPException\NotFoundException();
  77                 }
  78
  79                 $validated = in_array($item['private'], [Item::PUBLIC, Item::UNLISTED]);
  80
  81                 if (!$validated) {
  82                         $requester = HTTPSignature::getSigner('', $_SERVER);
  83                         if (!empty($requester)) {
  84                                 $receivers = Item::enumeratePermissions($item, false);
  85                                 $receivers[] = $item['contact-id'];
  86
  87                                 $validated = in_array(Contact::getIdForURL($requester, $item['uid']), $receivers);
  88                                 if (!$validated) {
  89                                         $validated = in_array(Contact::getIdForURL($requester), $receivers);
  90                                 }
  91                         }
  92                 }
  93
  94                 if (!$validated) {
  95                         throw new HTTPException\NotFoundException();
  96                 }
  97
  98                 $etag          = md5($this->parameters['guid'] . '-' . $item['changed']);
  99                 $last_modified = $item['changed'];
 100                 Network::checkEtagModified($etag, $last_modified);
 101
 102                 if (empty($this->parameters['activity']) && ($item['gravity'] != Item::GRAVITY_ACTIVITY)) {
 103                         $activity = ActivityPub\Transmitter::createCachedActivityFromItem($item['id'], false, true);
 104                         if (empty($activity['type'])) {
 105                                 throw new HTTPException\NotFoundException();
 106                         }
 107
 108                         $activity['type'] = $activity['type'] == 'Update' ? 'Create' : $activity['type'];
 109
 110                         // Only display "Create" activity objects here, no reshares or anything else
 111                         if (empty($activity['object']) || ($activity['type'] != 'Create')) {
 112                                 throw new HTTPException\NotFoundException();
 113                         }
 114
 115                         $data = ['@context' => ActivityPub::CONTEXT];
 116                         $data = array_merge($data, $activity['object']);
 117                 } elseif (empty($this->parameters['activity']) || in_array($this->parameters['activity'],
 118                         ['Create', 'Announce', 'Update', 'Like', 'Dislike', 'Accept', 'Reject',
 119                         'TentativeAccept', 'Follow', 'Add'])) {
 120                         $data = ActivityPub\Transmitter::createCachedActivityFromItem($item['id']);
 121                         if (empty($data)) {
 122                                 throw new HTTPException\NotFoundException();
 123                         }
 124                         if (!empty($this->parameters['activity']) && ($this->parameters['activity'] != 'Create')) {
 125                                 $data['type'] = $this->parameters['activity'];
 126                                 $data['id'] = str_replace('/Create', '/' . $this->parameters['activity'], $data['id']);
 127                         }
 128                 } else {
 129                         throw new HTTPException\NotFoundException();
 130                 }
 131
 132                 // Relaxed CORS header for public items
 133                 header('Access-Control-Allow-Origin: *');
 134
 135                 System::jsonExit($data, 'application/activity+json');
 136         }
 137 }