src/Module/ActivityPub/Objects.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2022, 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\Protocol\ActivityPub\PageCache;
  35 use Friendica\Util\HTTPSignature;
  36 use Friendica\Util\Network;
  37 use Friendica\Util\Strings;
  38
  39 /**
  40  * ActivityPub Objects
  41  */
  42 class Objects extends BaseModule
  43 {
  44         protected function rawContent(array $request = [])
  45         {
  46                 if (empty($this->parameters['guid'])) {
  47                         throw new HTTPException\BadRequestException();
  48                 }
  49
  50                 if (!ActivityPub::isRequest()) {
  51                         DI::baseUrl()->redirect(str_replace('objects/', 'display/', DI::args()->getQueryString()));
  52                 }
  53
  54                 $data = PageCache::fetch($_SERVER['REQUEST_URI']);
  55                 if (!empty($data)) {
  56                         header('Access-Control-Allow-Origin: *');
  57
  58                         System::jsonExit($data, 'application/activity+json');
  59                 }
  60
  61                 $itemuri = DBA::selectFirst('item-uri', ['id'], ['guid' => $this->parameters['guid']]);
  62
  63                 if (DBA::isResult($itemuri)) {
  64                         Logger::info('Provided GUID found.', ['guid' => $this->parameters['guid'], 'uri-id' => $itemuri['id']]);
  65                 } else {
  66                         // The item URI does not always contain the GUID. This means that we have to search the URL instead
  67                         $url = DI::baseUrl()->get() . '/' . DI::args()->getQueryString();
  68                         $nurl = Strings::normaliseLink($url);
  69                         $ssl_url = str_replace('http://', 'https://', $nurl);
  70
  71                         $itemuri = DBA::selectFirst('item-uri', ['guid', 'id'], ['uri' => [$url, $nurl, $ssl_url]]);
  72                         if (DBA::isResult($itemuri)) {
  73                                 Logger::info('URL found.', ['url' => $url, 'guid' => $itemuri['guid'], 'uri-id' => $itemuri['id']]);
  74                         } else {
  75                                 Logger::info('URL not found.', ['url' => $url]);
  76                                 throw new HTTPException\NotFoundException();
  77                         }
  78                 }
  79
  80                 $item = Post::selectFirst([], ['uri-id' => $itemuri['id'], 'origin' => true]);
  81                 if (!DBA::isResult($item)) {
  82                         throw new HTTPException\NotFoundException();
  83                 }
  84
  85                 $validated = in_array($item['private'], [Item::PUBLIC, Item::UNLISTED]);
  86
  87                 if (!$validated) {
  88                         $requester = HTTPSignature::getSigner('', $_SERVER);
  89                         if (!empty($requester)) {
  90                                 $receivers = Item::enumeratePermissions($item, false);
  91                                 $receivers[] = $item['contact-id'];
  92
  93                                 $validated = in_array(Contact::getIdForURL($requester, $item['uid']), $receivers);
  94                                 if (!$validated) {
  95                                         $validated = in_array(Contact::getIdForURL($requester), $receivers);
  96                                 }
  97                         }
  98                 }
  99
 100                 if (!$validated) {
 101                         throw new HTTPException\NotFoundException();
 102                 }
 103
 104                 $etag          = md5($this->parameters['guid'] . '-' . $item['changed']);
 105                 $last_modified = $item['changed'];
 106                 Network::checkEtagModified($etag, $last_modified);
 107
 108                 if (empty($this->parameters['activity']) && ($item['gravity'] != GRAVITY_ACTIVITY)) {
 109                         $activity = ActivityPub\Transmitter::createActivityFromItem($item['id'], true);
 110                         if (empty($activity['type'])) {
 111                                 throw new HTTPException\NotFoundException();
 112                         }
 113
 114                         $activity['type'] = $activity['type'] == 'Update' ? 'Create' : $activity['type'];
 115
 116                         // Only display "Create" activity objects here, no reshares or anything else
 117                         if (empty($activity['object']) || ($activity['type'] != 'Create')) {
 118                                 throw new HTTPException\NotFoundException();
 119                         }
 120
 121                         $data = ['@context' => ActivityPub::CONTEXT];
 122                         $data = array_merge($data, $activity['object']);
 123                 } elseif (empty($this->parameters['activity']) || in_array($this->parameters['activity'],
 124                         ['Create', 'Announce', 'Update', 'Like', 'Dislike', 'Accept', 'Reject',
 125                         'TentativeAccept', 'Follow', 'Add'])) {
 126                         $data = ActivityPub\Transmitter::createActivityFromItem($item['id']);
 127                         if (empty($data)) {
 128                                 throw new HTTPException\NotFoundException();
 129                         }
 130                         if (!empty($this->parameters['activity']) && ($this->parameters['activity'] != 'Create')) {
 131                                 $data['type'] = $this->parameters['activity'];
 132                                 $data['id'] = str_replace('/Create', '/' . $this->parameters['activity'], $data['id']);
 133                         }
 134                 } else {
 135                         throw new HTTPException\NotFoundException();
 136                 }
 137
 138                 if (in_array($item['private'], [Item::PUBLIC, Item::UNLISTED])) {
 139                         PageCache::add($_SERVER['REQUEST_URI'], $data);
 140                 }
 141
 142                 // Relaxed CORS header for public items
 143                 header('Access-Control-Allow-Origin: *');
 144
 145                 System::jsonExit($data, 'application/activity+json');
 146         }
 147 }