src/Protocol/Relay.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\Protocol;
  23
  24 use Friendica\Content\Text\BBCode;
  25 use Friendica\Core\Logger;
  26 use Friendica\DI;
  27 use Friendica\Model\Contact;
  28 use Friendica\Model\Search;
  29
  30 /**
  31  * Base class for relay handling
  32  */
  33 class Relay
  34 {
  35         /**
  36          * Check if a post is wanted
  37          *
  38          * @param array $tags
  39          * @param string $body
  40          * @param int $authorid
  41          * @param string $url
  42          * @return boolean "true" is the post is wanted by the system
  43          */
  44         public static function isSolicitedPost(array $tags, string $body, int $authorid, string $url, string $network = '')
  45         {
  46                 $config = DI::config();
  47
  48                 $subscribe = $config->get('system', 'relay_subscribe', false);
  49                 if ($subscribe) {
  50                         $scope = $config->get('system', 'relay_scope', SR_SCOPE_ALL);
  51                 } else {
  52                         $scope = SR_SCOPE_NONE;
  53                 }
  54
  55                 if ($scope == SR_SCOPE_NONE) {
  56                         Logger::info('Server does not accept relay posts - rejected', ['network' => $network, 'url' => $url]);
  57                         return false;
  58                 }
  59
  60                 if (Contact::isBlocked($authorid)) {
  61                         Logger::info('Author is blocked - rejected', ['author' => $authorid, 'network' => $network, 'url' => $url]);
  62                         return false;
  63                 }
  64
  65                 if (Contact::isHidden($authorid)) {
  66                         Logger::info('Author is hidden - rejected', ['author' => $authorid, 'network' => $network, 'url' => $url]);
  67                         return false;
  68                 }
  69
  70                 $systemTags = [];
  71                 $userTags = [];
  72                 $denyTags = [];
  73
  74                 if ($scope == SR_SCOPE_TAGS) {
  75                         $server_tags = $config->get('system', 'relay_server_tags');
  76                         $tagitems = explode(',', mb_strtolower($server_tags));
  77                         foreach ($tagitems AS $tag) {
  78                                 $systemTags[] = trim($tag, '# ');
  79                         }
  80
  81                         if ($config->get('system', 'relay_user_tags')) {
  82                                 $userTags = Search::getUserTags();
  83                         }
  84                 }
  85
  86                 $tagList = array_unique(array_merge($systemTags, $userTags));
  87
  88                 $deny_tags = $config->get('system', 'relay_deny_tags');
  89                 $tagitems = explode(',', mb_strtolower($deny_tags));
  90                 foreach ($tagitems AS $tag) {
  91                         $tag = trim($tag, '# ');
  92                         $denyTags[] = $tag;
  93                 }
  94
  95                 if (!empty($tagList) || !empty($denyTags)) {
  96                         $content = mb_strtolower(BBCode::toPlaintext($body, false));
  97
  98                         foreach ($tags as $tag) {
  99                                 $tag = mb_strtolower($tag);
 100                                 if (in_array($tag, $denyTags)) {
 101                                         Logger::info('Unwanted hashtag found - rejected', ['hashtag' => $tag, 'network' => $network, 'url' => $url]);
 102                                         return false;
 103                                 }
 104
 105                                 if (in_array($tag, $tagList)) {
 106                                         Logger::info('Subscribed hashtag found - accepted', ['hashtag' => $tag, 'network' => $network, 'url' => $url]);
 107                                         return true;
 108                                 }
 109
 110                                 // We check with "strpos" for performance issues. Only when this is true, the regular expression check is used
 111                                 // RegExp is taken from here: https://medium.com/@shiba1014/regex-word-boundaries-with-unicode-207794f6e7ed
 112                                 if ((strpos($content, $tag) !== false) && preg_match('/(?<=[\s,.:;"\']|^)' . preg_quote($tag, '/') . '(?=[\s,.:;"\']|$)/', $content)) {
 113                                         Logger::info('Subscribed hashtag found in content - accepted', ['hashtag' => $tag, 'network' => $network, 'url' => $url]);
 114                                         return true;
 115                                 }
 116                         }
 117                 }
 118
 119                 if ($scope == SR_SCOPE_ALL) {
 120                         Logger::info('Server accept all posts - accepted', ['network' => $network, 'url' => $url]);
 121                         return true;
 122                 }
 123
 124                 Logger::info('No matching hashtags found - rejected', ['network' => $network, 'url' => $url]);
 125                 return false;
 126         }
 127 }