Yandex Dynamic DNS Updater

yapi.php

<?php

/*
    Yandex DNS automatic update script.
    Uses Yandex's DNS as a DDNS service as they provide configurable TTL value.
    
    Synopsis:
        updateDomain (string $domain, string $apiKey, [array $blacklist = []])
    
    Where:
        $domain    :   your domain name
        $apiKey    :   an API key provided by Yandex.
                       The API key should be obtained here:
                       https://pddimp.yandex.ru/api2/admin/get_token
        $blacklist : An array of subdomains which should not be updated
    
    Example:
        updateDomain ('asterleen.com', 'IMMAYANDEXKEYYARRRSUXMYD1CK13371488228LOLAZAZA', ['dont', 'update', 'us']);
        
    Process of domain update will be commented to stdout.
*/


define ('YAPI_ADDR', 'https://pddimp.yandex.ru/api2/admin/dns/');

function curl_request ($method, $type, $fields, $apiKey)
{
    $curl = curl_init();

    if($curl)
    {
        curl_setopt($curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
        curl_setopt($curl, CURLOPT_URL, YAPI_ADDR.$method.($type == 'get' ? '?'.http_build_query($fields) : ''));
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_TIMEOUT, 5);
        curl_setopt($curl, CURLOPT_USERAGENT, 'SoCute/1.3.3.7');
        
        if ($type == 'post')
        {
            curl_setopt($curl, CURLOPT_POST, true);
            curl_setopt($curl, CURLOPT_POSTFIELDS, $fields);
        }
        
        // Yapi Auth
        curl_setopt($curl, CURLOPT_HTTPHEADER, array('PddToken: '.$apiKey));
        
        $out = curl_exec($curl);
        curl_close($curl);
        return (empty ($out)) ? false : $out;
    } else
        return false;
}

function getMyIp()
{
    $ipservice = 'http://icanhazip.com';
    $myIP = trim(file_get_contents($ipservice));
    if (empty($myIP) || $myIP == '127.0.0.1')
        return false;
    else
        return $myIP;
}

function updateDomain($domain, $apiKey, $blacklist = [])
{
    $myIP = getMyIp();
    
    if (empty($myIP))
        die ('IP Getting Error, exiting!');
        
    $raw = curl_request ('list', 'get', array('domain' => $domain), $apiKey);
    
    if (!$raw)
        die ('Could not make request!');
    
    $json = json_decode($raw, true);
    
    if (!$json)
        die ('Could not parse JSON!');
    
    if ($json['success'] == 'error')
    {
        die ('Some API error occured: '.$json['error']);
    }
    
    $records = $json['records'];
    
    foreach ($records as $rec)
    {
        if ($rec['type'] == 'A') // Only A records can be updated
        {
            $sub = $rec['subdomain'];
            if (!in_array($sub, $blacklist)) // Checking black list
            {
                if ($rec['content'] == $myIP) // Why must we do this if we are already up to date?
                {
                    echo ('Record '.$sub." is already set, ignore\n");
                    continue;
                }
                    
                $id  = $rec['record_id'];

                $res_update = curl_request('edit', 'post', Array('domain' => $domain, 'record_id' => $id, 'content' => $myIP, 'ttl' => 90), $apiKey);
                
                if (!$res_update)
                    echo ('Could not update record '.$id.' ['.$sub."]!\n");
                    
                $json_update = json_decode($res_update, true);
                
                if (!$json_update)
                    echo ('Could not parse JSON for record '.$id.' ['.$sub."]!\n");
                
                if ($json_update['success'] == 'ok')
                    echo ('Record update for '.$sub." done (ok)\n");
                else
                    echo ('Record update for '.$sub.' FAILED ('.$json_update['error'].")\n"); 
            }
        }    
    }
}