src/Module/Diaspora/Fetch.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2024, 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\Diaspora;
  23
  24 use Friendica\BaseModule;
  25 use Friendica\Core\Protocol;
  26 use Friendica\Core\System;
  27 use Friendica\DI;
  28 use Friendica\Model\Item;
  29 use Friendica\Model\Post;
  30 use Friendica\Model\User;
  31 use Friendica\Module\Response;
  32 use Friendica\Network\HTTPException;
  33 use Friendica\Protocol\Diaspora;
  34 use Friendica\Util\Strings;
  35
  36 /**
  37  * This module is part of the Diaspora protocol.
  38  * It is used for fetching single public posts.
  39  */
  40 class Fetch extends BaseModule
  41 {
  42         protected function rawContent(array $request = [])
  43         {
  44                 if (empty($this->parameters['guid'])) {
  45                         throw new HTTPException\NotFoundException();
  46                 }
  47
  48                 $guid = $this->parameters['guid'];
  49
  50                 // Fetch the item
  51                 $condition = ['origin' => true, 'private' => [Item::PUBLIC, Item::UNLISTED], 'guid' => $guid,
  52                         'gravity' => [Item::GRAVITY_PARENT, Item::GRAVITY_COMMENT], 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
  53                 $item = Post::selectFirst([], $condition);
  54                 if (empty($item)) {
  55                         $condition = ['guid' => $guid, 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
  56                         $item = Post::selectFirst(['author-link'], $condition);
  57                         if (!empty($item["author-link"])) {
  58                                 $parts = parse_url($item["author-link"]);
  59                                 if (empty($parts["scheme"]) || empty($parts["host"])) {
  60                                         throw new HTTPException\InternalServerErrorException();
  61                                 }
  62                                 $host = $parts["scheme"] . "://" . $parts["host"];
  63
  64                                 if (Strings::normaliseLink($host) != Strings::normaliseLink(DI::baseUrl())) {
  65                                         $location = $host . "/fetch/" . DI::args()->getArgv()[1] . "/" . urlencode($guid);
  66                                         System::externalRedirect($location, 301);
  67                                 }
  68                         }
  69
  70                         throw new HTTPException\NotFoundException();
  71                 }
  72
  73                 // Fetch some data from the author (We could combine both queries - but I think this is more readable)
  74                 $user = User::getOwnerDataById($item["uid"]);
  75                 if (!$user) {
  76                         throw new HTTPException\NotFoundException();
  77                 }
  78
  79                 if ($item['gravity'] == Item::GRAVITY_PARENT) {
  80                         $status = Diaspora::buildStatus($item, $user);
  81                 } else {
  82                         $status = ['type' => 'comment', 'message' => Diaspora::createCommentSignature($item)];
  83                 }
  84
  85                 $xml = Diaspora::buildPostXml($status["type"], $status["message"]);
  86
  87                 // Send the envelope
  88                 $this->httpExit(Diaspora::buildMagicEnvelope($xml, $user), Response::TYPE_XML, 'application/magic-envelope+xml');
  89         }
  90 }