src/Module/ActivityPub/Objects.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2021, 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\Security\PermissionSet\Repository\PermissionSet;
  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         public function rawContent()
  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                 $itemuri = DBA::selectFirst('item-uri', ['id'], ['guid' => $this->parameters['guid']]);
  55
  56                 if (DBA::isResult($itemuri)) {
  57                         Logger::info('Provided GUID found.', ['guid' => $this->parameters['guid'], 'uri-id' => $itemuri['id']]);
  58                 } else {
  59                         // The item URI does not always contain the GUID. This means that we have to search the URL instead
  60                         $url = DI::baseUrl()->get() . '/' . DI::args()->getQueryString();
  61                         $nurl = Strings::normaliseLink($url);
  62                         $ssl_url = str_replace('http://', 'https://', $nurl);
  63
  64                         $itemuri = DBA::selectFirst('item-uri', ['guid', 'id'], ['uri' => [$url, $nurl, $ssl_url]]);
  65                         if (DBA::isResult($itemuri)) {
  66                                 Logger::info('URL found.', ['url' => $url, 'guid' => $itemuri['guid'], 'uri-id' => $itemuri['id']]);
  67                         } else {
  68                                 Logger::info('URL not found.', ['url' => $url]);
  69                                 throw new HTTPException\NotFoundException();
  70                         }
  71                 }
  72
  73                 $item = Post::selectFirst(['id', 'uid', 'origin', 'author-link', 'changed', 'private', 'psid', 'gravity', 'deleted', 'parent-uri-id'],
  74                         ['uri-id' => $itemuri['id']], ['order' => ['origin' => true]]);
  75
  76                 if (!DBA::isResult($item)) {
  77                         throw new HTTPException\NotFoundException();
  78                 }
  79
  80                 $validated = in_array($item['private'], [Item::PUBLIC, Item::UNLISTED]);
  81
  82                 if (!$validated) {
  83                         $requester = HTTPSignature::getSigner('', $_SERVER);
  84                         if (!empty($requester) && $item['origin']) {
  85                                 $requester_id = Contact::getIdForURL($requester, $item['uid']);
  86                                 if (!empty($requester_id)) {
  87                                         $permissionSets = DI::permissionSet()->selectByContactId($requester_id, $item['uid']);
  88                                         $psids = array_merge($permissionSets->column('id'), [PermissionSet::PUBLIC]);
  89                                         $validated = in_array($item['psid'], $psids);
  90                                 }
  91                         }
  92                 }
  93
  94                 if ($validated) {
  95                         // Valid items are original post or posted from this node (including in the case of a forum)
  96                         $validated = ($item['origin'] || (parse_url($item['author-link'], PHP_URL_HOST) == parse_url(DI::baseUrl()->get(), PHP_URL_HOST)));
  97
  98                         if (!$validated && $item['deleted']) {
  99                                 $validated = Post::exists(['origin' => true, 'uri-id' => $item['parent-uri-id']]);
 100                         }
 101                 }
 102
 103                 if (!$validated) {
 104                         throw new HTTPException\NotFoundException();
 105                 }
 106
 107                 $etag          = md5($this->parameters['guid'] . '-' . $item['changed']);
 108                 $last_modified = $item['changed'];
 109                 Network::checkEtagModified($etag, $last_modified);
 110
 111                 if (empty($this->parameters['activity']) && ($item['gravity'] != GRAVITY_ACTIVITY)) {
 112                         $activity = ActivityPub\Transmitter::createActivityFromItem($item['id'], true);
 113                         if (empty($activity['type'])) {
 114                                 throw new HTTPException\NotFoundException();
 115                         }
 116
 117                         $activity['type'] = $activity['type'] == 'Update' ? 'Create' : $activity['type'];
 118
 119                         // Only display "Create" activity objects here, no reshares or anything else
 120                         if (empty($activity['object']) || ($activity['type'] != 'Create')) {
 121                                 throw new HTTPException\NotFoundException();
 122                         }
 123
 124                         $data = ['@context' => ActivityPub::CONTEXT];
 125                         $data = array_merge($data, $activity['object']);
 126                 } elseif (empty($this->parameters['activity']) || in_array($this->parameters['activity'],
 127                         ['Create', 'Announce', 'Update', 'Like', 'Dislike', 'Accept', 'Reject',
 128                         'TentativeAccept', 'Follow', 'Add'])) {
 129                         $data = ActivityPub\Transmitter::createActivityFromItem($item['id']);
 130                         if (empty($data)) {
 131                                 throw new HTTPException\NotFoundException();
 132                         }
 133                         if (!empty($this->parameters['activity']) && ($this->parameters['activity'] != 'Create')) {
 134                                 $data['type'] = $this->parameters['activity'];
 135                                 $data['id'] = str_replace('/Create', '/' . $this->parameters['activity'], $data['id']);
 136                         }
 137                 } else {
 138                         throw new HTTPException\NotFoundException();
 139                 }
 140
 141                 // Relaxed CORS header for public items
 142                 header('Access-Control-Allow-Origin: *');
 143                 System::jsonExit($data, 'application/activity+json');
 144         }
 145 }