cache.url.php

<?php

$retina = true;
$key = 'kokenwtf'; //ENTER YOUR OWN KEY

if ($_GET['key'] != $key) die;

$ds = DIRECTORY_SEPARATOR;
$root = dirname(__FILE__);
$content = $root . $ds . 'storage';
$base = '/storage/cache/images';

require($content . $ds . 'configuration' . $ds . 'database.php');

$interface = $KOKEN_DATABASE['driver'];

$query = "SELECT id, filename, file_modified_on FROM {$KOKEN_DATABASE['prefix']}content";

if ($interface == 'mysqli')
{
	$db_link = mysqli_connect($KOKEN_DATABASE['hostname'], $KOKEN_DATABASE['username'], $KOKEN_DATABASE['password'], null, (int) $KOKEN_DATABASE['port'], $KOKEN_DATABASE['socket']);
	$db_link->select_db($KOKEN_DATABASE['database']);

	if ($query)
	{
	    $result = $db_link->query($query);
		if ($result)
		{
		    while ($row = $result->fetch_assoc()) {
			$results[] = $row;
		    }
		    $result->close();
		}
	}
	$db_link->close();
}
else
{
	mysql_connect($KOKEN_DATABASE['hostname'], $KOKEN_DATABASE['username'], $KOKEN_DATABASE['password']);
	mysql_select_db($KOKEN_DATABASE['database']);

	if ($query)
	{
		$result = mysql_query($query);
		if ($result)
		{
		    while ($row = mysql_fetch_assoc($result)) {
			$results[] = $row;
		    }
		}
	}
	mysql_close();
}

$requests = array();

foreach($results as $image) {
    $full_id = str_pad($image['id'], 6, 0, STR_PAD_LEFT);
    $parts = str_split($full_id, $split_length = 3);
    
    $url = $base.'/'.$parts[0].'/'.$parts[1];
    
    list($name, $ext) = explode('.', $image['filename']);
    
    $size = array(
		  'tiny',
		  'small',
		  'medium',
		  'medium_large',
		  'large',
		  'xlarge',
		  'huge'
		  );
    
    foreach($size as $s) {
	$requests[] = $url.'/'.$name.','.$s.'.'.$image['file_modified_on'].'.'.$ext;
	if ($retina) {
	    $requests[] = $url.'/'.$name.','.$s.'.2x.'.$image['file_modified_on'].'.'.$ext;
	}
    }
}

echo json_encode($requests);

warm_cache.rb

#!/usr/bin/env ruby2.0

require 'rubygems'
require 'net/https'
require 'uri'
require 'json'
require 'pp'


host = 'localhost'
port = 443
key = 'kokenwtf'


list_uri = "https://#{host}/cache.url.php?key=#{key}"
pp list_uri

http = Net::HTTP.new(host, port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE
request = Net::HTTP::Get.new(URI.parse(list_uri))
response = http.request(request)
images = JSON.parse(response.body)
i = 1
images.each do |image|
  uri = "https://#{host}#{image}"
  request = Net::HTTP::Get.new(URI.parse(uri))
  response = http.request(request)
  print "#{i}/#{images.length} - Status: #{response.code} - URL: #{uri}\n"
  i += 1
end