<?php

$url = $_GET['url'];

if ( $url && preg_match('#^(http|https)//:#i', $url) ) {
    $ch = curl_init();
    curl_setopt_array($ch, array(
        CURLOPT_URL => $url,
        CURLOPT_HEADER => 1,
        CURLOPT_NOBODY => 1,
        CURLOPT_RETURNTRANSFER => 1 ,
        CURLOPT_TIMEOUT, 5
    ));
    $response = curl_exec($ch);
    $lines = explode("\r\n", $response);
    $headers = array();

    foreach ($lines as $line) {
        $temp = explode(': ', $line);
        $headers[strtolower($temp[0]) ] = $temp[1];
    }

    if ( isset($headers['content-type']) && isset($headers['content-length']) && $headers['accept-ranges'] == 'bytes' ) {
        if ( !preg_match('#^image/(png|jpeg)$#', $headers['content-type']) ) {
            die('ERROR:INVALID_TYPE');
        }
        else if ( $headers['content-length'] < 20000 ) {
            die('ERROR:TOO_SMALL');
        }
        else if ( $headers['content-length'] > 1000000 ) {
            die('ERROR:TOO_BIG');
        }

        if ( ( $data = file_get_contents($url) ) !== false ) {
            die( 'data:' + $headers['content-type'] . ';base64,' . base64_encode($data) );
        }
    }
}

echo('ERROR');

?>