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pocesar/get domain without subdomain.php

Created April 11, 2013 20:27
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  1. pocesar created this gist Apr 11, 2013.
    168 changes: 168 additions & 0 deletions get domain without subdomain.php
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,168 @@
    <?php
    /**
    * @param string $domain Pass $_SERVER['SERVER_NAME'] here
    * @param bool $debug
    *
    * @debug bool $debug
    * @return string
    */
    function get_domain($domain, $debug = false)
    {
    $original = $domain = strtolower($domain);

    if (filter_var($domain, FILTER_VALIDATE_IP)) { return $domain; }

    $debug ? print('<strong style="color:green">&raquo;</strong> Parsing: '.$original) : false;

    $arr = array_slice(array_filter(explode('.', $domain, 4), function($value){
    return $value !== 'www';
    }), 0); //rebuild array indexes

    if (count($arr) > 2)
    {
    $count = count($arr);
    $_sub = explode('.', $count === 4 ? $arr[3] : $arr[2]);

    $debug ? print(" (parts count: {$count})") : false;

    if (count($_sub) === 2) // two level TLD
    {
    $removed = array_shift($arr);
    if ($count === 4) // got a subdomain acting as a domain
    {
    $removed = array_shift($arr);
    }
    $debug ? print("<br>\n" . '[*] Two level TLD: <strong>' . join('.', $_sub) . '</strong> ') : false;
    }
    elseif (count($_sub) === 1) // one level TLD
    {
    $removed = array_shift($arr); //remove the subdomain

    if (strlen($_sub[0]) === 2 && $count === 3) // TLD domain must be 2 letters
    {
    array_unshift($arr, $removed);
    }
    else
    {
    // non country TLD according to IANA
    $tlds = array(
    'aero',
    'arpa',
    'asia',
    'biz',
    'cat',
    'com',
    'coop',
    'edu',
    'gov',
    'info',
    'jobs',
    'mil',
    'mobi',
    'museum',
    'name',
    'net',
    'org',
    'post',
    'pro',
    'tel',
    'travel',
    'xxx',
    );

    if (count($arr) > 2 && in_array($_sub[0], $tlds) !== false) //special TLD don't have a country
    {
    array_shift($arr);
    }
    }
    $debug ? print("<br>\n" .'[*] One level TLD: <strong>'.join('.', $_sub).'</strong> ') : false;
    }
    else // more than 3 levels, something is wrong
    {
    for ($i = count($_sub); $i > 1; $i--)
    {
    $removed = array_shift($arr);
    }
    $debug ? print("<br>\n" . '[*] Three level TLD: <strong>' . join('.', $_sub) . '</strong> ') : false;
    }
    }
    elseif (count($arr) === 2)
    {
    $arr0 = array_shift($arr);

    if (strpos(join('.', $arr), '.') === false
    && in_array($arr[0], array('localhost','test','invalid')) === false) // not a reserved domain
    {
    $debug ? print("<br>\n" .'Seems invalid domain: <strong>'.join('.', $arr).'</strong> re-adding: <strong>'.$arr0.'</strong> ') : false;
    // seems invalid domain, restore it
    array_unshift($arr, $arr0);
    }
    }

    $debug ? print("<br>\n".'<strong style="color:gray">&laquo;</strong> Done parsing: <span style="color:red">' . $original . '</span> as <span style="color:blue">'. join('.', $arr) ."</span><br>\n") : false;

    return join('.', $arr);
    }

    $urls = array(
    'www.example.com' => 'example.com',
    'example.com' => 'example.com',
    'example.com.br' => 'example.com.br',
    'www.example.com.br' => 'example.com.br',
    'www.example.gov.br' => 'example.gov.br',
    'localhost' => 'localhost',
    'www.localhost' => 'localhost',
    'subdomain.localhost' => 'localhost',
    'www.subdomain.example.com' => 'example.com',
    'subdomain.example.com' => 'example.com',
    'subdomain.example.com.br' => 'example.com.br',
    'www.subdomain.example.com.br' => 'example.com.br',
    'www.subdomain.example.biz.br' => 'example.biz.br',
    'subdomain.example.biz.br' => 'example.biz.br',
    'subdomain.example.net' => 'example.net',
    'www.subdomain.example.net' => 'example.net',
    'www.subdomain.example.co.kr' => 'example.co.kr',
    'subdomain.example.co.kr' => 'example.co.kr',
    'example.co.kr' => 'example.co.kr',
    'example.jobs' => 'example.jobs',
    'www.example.jobs' => 'example.jobs',
    'subdomain.example.jobs' => 'example.jobs',
    'insane.subdomain.example.jobs' => 'example.jobs',
    'insane.subdomain.example.com.br' => 'example.com.br',
    'www.doubleinsane.subdomain.example.com.br' => 'example.com.br',
    'www.subdomain.example.jobs' => 'example.jobs',
    'test' => 'test',
    'www.test' => 'test',
    'subdomain.test' => 'test',
    'www.detran.sp.gov.br' => 'sp.gov.br',
    'www.mp.sp.gov.br' => 'sp.gov.br',
    'ny.library.museum' => 'library.museum',
    'www.ny.library.museum' => 'library.museum',
    'ny.ny.library.museum' => 'library.museum',
    'www.library.museum' => 'library.museum',
    'info.abril.com.br' => 'abril.com.br',
    '127.0.0.1' => '127.0.0.1',
    '::1' => '::1',
    );

    $failed = 0;
    $total = count($urls);

    foreach ($urls as $from => $expected)
    {
    $from = get_domain($from, true);
    if ($from !== $expected)
    {
    $failed++;
    print("<div style='color:fuchsia;'>expected {$from} to be {$expected}</div>");
    }
    }

    if ($failed)
    {
    print("{$failed} tests failed out of {$total}");
    }
    else
    {
    print("Success");
    }