friendica-github/include/gprobe.php

<?php
/**
 * @file include/gprobe.php
 */
use Friendica\Core\Cache;
use Friendica\Core\Config;
use Friendica\Database\DBM;
use Friendica\Model\GlobalContact;
use Friendica\Network\Probe;
use Friendica\Protocol\PortableContact;

require_once 'include/datetime.php';

function gprobe_run(&$argv, &$argc)
{
	if ($argc != 2) {
		return;
	}
	$url = $argv[1];

	$r = q(
		"SELECT `id`, `url`, `network` FROM `gcontact` WHERE `nurl` = '%s' ORDER BY `id` LIMIT 1",
		dbesc(normalise_link($url))
	);

	logger("gprobe start for ".normalise_link($url), LOGGER_DEBUG);

	if (!DBM::is_result($r)) {
		// Is it a DDoS attempt?
		$urlparts = parse_url($url);

		$result = Cache::get("gprobe:".$urlparts["host"]);
		if (!is_null($result)) {
			if (in_array($result["network"], array(NETWORK_FEED, NETWORK_PHANTOM))) {
				logger("DDoS attempt detected for ".$urlparts["host"]." by ".$_SERVER["REMOTE_ADDR"].". server data: ".print_r($_SERVER, true), LOGGER_DEBUG);
				return;
			}
		}

		$arr = Probe::uri($url);

		if (is_null($result)) {
			Cache::set("gprobe:".$urlparts["host"], $arr);
		}

		if (!in_array($arr["network"], array(NETWORK_FEED, NETWORK_PHANTOM))) {
			GlobalContact::update($arr);
		}

		$r = q(
			"SELECT `id`, `url`, `network` FROM `gcontact` WHERE `nurl` = '%s' ORDER BY `id` LIMIT 1",
			dbesc(normalise_link($url))
		);
	}
	if (DBM::is_result($r)) {
		// Check for accessibility and do a poco discovery
		if (poco_last_updated($r[0]['url'], true) && ($r[0]["network"] == NETWORK_DFRN)) {
			PortableContact::loadWorker(0, 0, $r[0]['id'], str_replace('/profile/', '/poco/', $r[0]['url']));
		}
	}

	logger("gprobe end for ".normalise_link($url), LOGGER_DEBUG);
	return;
}