nhentai downloader

nhentai_downloader.php

<?php

declare(strict_types=1);

function dd($var)
{

    var_dump($var);
    die;
}
function fetch(string $url): string
{
    static $db = null;
    if ($db === null) {
        $db = new \PDO('sqlite:' . __FILE__ . '.cache.db', null, null, [
            \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
            \PDO::ATTR_DEFAULT_FETCH_MODE => \PDO::FETCH_ASSOC,
        ]);
        $db->exec("CREATE TABLE IF NOT EXISTS urlcache(
            id INTEGER PRIMARY KEY,
            url TEXT NOT NULL UNIQUE,
            body BLOB NOT NULL
        )");
        //dd($db->query("SELECT * FROM urlcache")->fetchAll());
    }
    $dbResult = $db->query("SELECT body FROM urlcache WHERE url = " . $db->quote($url))->fetchAll();
    if (!empty($dbResult)) {
        return $dbResult[0]['body'];
    }
    static $ch = null;
    if ($ch === null) {
        $ch = curl_init();
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_MAXREDIRS => 5,
            CURLOPT_CONNECTTIMEOUT => 8,
            CURLOPT_TIMEOUT => 10,
            //CURLOPT_USERAGENT => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36',
            CURLOPT_ENCODING => '',
        ]);
    }
    curl_setopt_array($ch, array(
        CURLOPT_URL => $url,
    ));
    $result = curl_exec($ch);
    if ($result === false || curl_errno($ch) !== CURLE_OK) {
        throw new Exception('Curl error: ' . curl_error($ch));
    }
    $sql = "INSERT OR REPLACE INTO urlcache (url,body) VALUES(" . $db->quote($url) . "," . $db->quote($result) .  ")";
    //dd($sql);
    $db->exec($sql);
    return $result;
}
function downloadEntireSeries(int $id)
{
    $workDir = __DIR__ . '/nhen/' . $id;
    if (!is_dir($workDir)) {
        if(!mkdir($workDir, 0777, true)){
            throw new Exception('Cannot create work dir');
        }
    }
    chdir($workDir);
    $url = "https://nhentai.to/g/{$id}";
    $html = fetch($url);
    $dom = new DOMDocument();
    @$dom->loadHTML($html);
    $xpath = new DOMXPath($dom);
    $nodes = $xpath->query('//a[contains(@class,"gallerythumb")]');
    foreach ($nodes as $node) {
        $href = "https://nhentai.to" . $node->getAttribute('href');
        $html = fetch($href);
        $dom2 = new DOMDocument();
        @$dom2->loadHTML($html);
        $xpath2 = new DOMXPath($dom2);
        $src = $xpath2->query('//section[@id="image-container"]//img')->item(0)->getAttribute('src');
        $filename = basename($src);
        var_dump($filename);
        if (!file_exists($filename)) {
            file_put_contents($filename, fetch($src), LOCK_EX);
        }
    }
}
downloadEntireSeries(399262);