friendica-addons/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;
function blockbot_install() {
Hook::register('init_1', 'addon/blockbot/blockbot.php', 'blockbot_init_1');
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}
function blockbot_uninstall() {
Hook::unregister('init_1', 'addon/blockbot/blockbot.php', 'blockbot_init_1');
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}
function blockbot_init_1(App $a) {
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$crawlerDetect = new CrawlerDetect();
if ($crawlerDetect->isCrawler()) {
System::httpExit(403, 'Bots are not allowed');
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}
}