mirror of https://github.com/friendica/friendica
116 lines
3.5 KiB
PHP
116 lines
3.5 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2020, Friendica
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Protocol;
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use Friendica\Content\Text\BBCode;
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use Friendica\Core\Logger;
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use Friendica\DI;
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use Friendica\Model\Search;
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/**
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* Base class for relay handling
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*/
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class Relay
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{
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/**
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* Check if a post is wanted
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*
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* @param array $tags
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* @param string $body
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* @param string $url
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* @return boolean "true" is the post is wanted by the system
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*/
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public static function isSolicitedPost(array $tags, string $body, string $url, string $network = '')
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{
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$config = DI::config();
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$subscribe = $config->get('system', 'relay_subscribe', false);
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if ($subscribe) {
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$scope = $config->get('system', 'relay_scope', SR_SCOPE_ALL);
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} else {
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$scope = SR_SCOPE_NONE;
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}
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if ($scope == SR_SCOPE_NONE) {
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Logger::info('Server does not accept relay posts - rejected', ['network' => $network, 'url' => $url]);
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return false;
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}
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$systemTags = [];
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$userTags = [];
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$denyTags = [];
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if ($scope == SR_SCOPE_TAGS) {
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$server_tags = $config->get('system', 'relay_server_tags');
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$tagitems = explode(',', mb_strtolower($server_tags));
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foreach ($tagitems AS $tag) {
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$systemTags[] = trim($tag, '# ');
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}
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if ($config->get('system', 'relay_user_tags')) {
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$userTags = Search::getUserTags();
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}
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}
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$tagList = array_unique(array_merge($systemTags, $userTags));
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$deny_tags = $config->get('system', 'relay_deny_tags');
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$tagitems = explode(',', mb_strtolower($deny_tags));
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foreach ($tagitems AS $tag) {
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$tag = trim($tag, '# ');
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$denyTags[] = $tag;
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}
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if (!empty($tagList) || !empty($denyTags)) {
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$content = mb_strtolower(BBCode::toPlaintext($body, false));
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foreach ($tags as $tag) {
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$tag = mb_strtolower($tag);
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if (in_array($tag, $denyTags)) {
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Logger::info('Unwanted hashtag found - rejected', ['hashtag' => $tag, 'network' => $network, 'url' => $url]);
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return false;
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}
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if (in_array($tag, $tagList)) {
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Logger::info('Subscribed hashtag found - accepted', ['hashtag' => $tag, 'network' => $network, 'url' => $url]);
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return true;
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}
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// We check with "strpos" for performance issues. Only when this is true, the regular expression check is used
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// RegExp is taken from here: https://medium.com/@shiba1014/regex-word-boundaries-with-unicode-207794f6e7ed
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if ((strpos($content, $tag) !== false) && preg_match('/(?<=[\s,.:;"\']|^)' . preg_quote($tag, '/') . '(?=[\s,.:;"\']|$)/', $content)) {
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Logger::info('Subscribed hashtag found in content - accepted', ['hashtag' => $tag, 'network' => $network, 'url' => $url]);
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return true;
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}
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}
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}
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if ($scope == SR_SCOPE_ALL) {
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Logger::info('Server accept all posts - accepted', ['network' => $network, 'url' => $url]);
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return true;
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}
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Logger::info('No matching hashtags found - rejected', ['network' => $network, 'url' => $url]);
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return false;
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}
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}
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