src/Module/Diaspora/Fetch.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\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\Network\HTTPException;
  32 use Friendica\Protocol\Diaspora;
  33 use Friendica\Util\Strings;
  34
  35 /**
  36  * This module is part of the Diaspora protocol.
  37  * It is used for fetching single public posts.
  38  */
  39 class Fetch extends BaseModule
  40 {
  41         public function rawContent()
  42         {
  43                 if (empty($this->parameters['guid'])) {
  44                         throw new HTTPException\NotFoundException();
  45                 }
  46
  47                 $guid = $this->parameters['guid'];
  48
  49                 // Fetch the item
  50                 $condition = ['origin' => true, 'private' => [Item::PUBLIC, Item::UNLISTED], 'guid' => $guid,
  51                         'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT], 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
  52                 $item = Post::selectFirst([], $condition);
  53                 if (empty($item)) {
  54                         $condition = ['guid' => $guid, 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
  55                         $item = Post::selectFirst(['author-link'], $condition);
  56                         if (!empty($item["author-link"])) {
  57                                 $parts = parse_url($item["author-link"]);
  58                                 if (empty($parts["scheme"]) || empty($parts["host"])) {
  59                                         throw new HTTPException\InternalServerErrorException();
  60                                 }
  61                                 $host = $parts["scheme"] . "://" . $parts["host"];
  62
  63                                 if (Strings::normaliseLink($host) != Strings::normaliseLink(DI::baseUrl()->get())) {
  64                                         $location = $host . "/fetch/" . DI::args()->getArgv()[1] . "/" . urlencode($guid);
  65                                         System::externalRedirect($location, 301);
  66                                 }
  67                         }
  68
  69                         throw new HTTPException\NotFoundException();
  70                 }
  71
  72                 // Fetch some data from the author (We could combine both queries - but I think this is more readable)
  73                 $user = User::getOwnerDataById($item["uid"]);
  74                 if (!$user) {
  75                         throw new HTTPException\NotFoundException();
  76                 }
  77
  78                 if ($item['gravity'] == GRAVITY_PARENT) {
  79                         $status = Diaspora::buildStatus($item, $user);
  80                 } else {
  81                         $status = ['type' => 'comment', 'message' => Diaspora::createCommentSignature($item)];
  82                 }
  83
  84                 $xml = Diaspora::buildPostXml($status["type"], $status["message"]);
  85
  86                 // Send the envelope
  87                 header("Content-Type: application/magic-envelope+xml; charset=utf-8");
  88                 echo Diaspora::buildMagicEnvelope($xml, $user);
  89
  90                 exit();
  91         }
  92 }