friendica-addons-sekb/blockbot/blockbot.php

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<?php
/**
* Name: blockbot
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* Description: Blocking bots based on detecting bots/crawlers/spiders via the user agent and http_from header.
* Version: 0.1
* Author: Philipp Holzer <admin@philipp.info>
*
*/
use Friendica\App;
use Friendica\Core\Hook;
use Friendica\Core\System;
use Jaybizzle\CrawlerDetect\CrawlerDetect;
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use Friendica\Core\Logger;
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require_once __DIR__ . DIRECTORY_SEPARATOR . 'vendor' . DIRECTORY_SEPARATOR . 'autoload.php';
function blockbot_install() {
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Hook::register('init_1', __FILE__, 'blockbot_init_1');
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}
function blockbot_uninstall() {
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Hook::unregister('init_1', __FILE__, 'blockbot_init_1');
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}
function blockbot_init_1(App $a) {
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$crawlerDetect = new CrawlerDetect();
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// List of strings of known "good" agents
$agents = ['diaspora-connection-tester', 'DiasporaFederation', 'Friendica', '(compatible; zot)',
'Micro.blog', 'Mastodon', 'hackney', 'GangGo', 'python/federation', 'GNU social', 'winHttp',
'Go-http-client', 'Mr.4x3 Powered', 'Test Certificate Info', 'WordPress.com', 'zgrab',
'curl/', 'StatusNet', 'OpenGraphReader/', 'Uptimebot/', 'python-opengraph-jaywink'];
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if ($crawlerDetect->isCrawler()) {
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foreach ($agents as $agent) {
if (stristr($_SERVER['HTTP_USER_AGENT'], $agent)) {
// @ToDo: Report every false positive here: https://github.com/JayBizzle/Crawler-Detect/issues/326
logger::notice('False positive', ['agent' => $_SERVER['HTTP_USER_AGENT']]);
return;
}
}
logger::info('Blocked bot', ['agent' => $_SERVER['HTTP_USER_AGENT']]);
System::httpExit(403, 'Bots are not allowed');
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} else {
logger::debug('Good user agent detected', ['agent' => $_SERVER['HTTP_USER_AGENT']]);
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}
}