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