Scrup FTP Handler

scrup_handler.php

<?
/**
 * Scrup FTP handler
 * https://github.com/rsms/scrup
 */

$DOMAIN         = "http://scrup.domain.com";
$MAXSIZE        = 2097152; // 2 MB
$FTP_SERVER     = "scrup.domain.com";
$FTP_USER       = "scrup";
$FTP_PASSWORD   = "secret";

function http_response($msg='', $st='400 Bad Request') {
    header('HTTP/1.1 '.$st);
    exit($msg);	
}

function d($d) {
    echo "<pre>";
    var_dump($d);
    echo "</pre>";
}

// Build path and url
// Construct 'unique' filename
$filename = substr( base_convert( md5( strval(microtime()) . ' ' . $_SERVER['REMOTE_ADDR'] ), 16, 36 ), 0, 12 ) . '.png';
// Construct url
$url = $DOMAIN . $filename;

// Here we should probably check if the file actually already exists
// ...

// Open FTP connection
$ftp_connection = ftp_connect($FTP_SERVER);
$ftp_result = ftp_login($ftp_connection, $FTP_USER, $FTP_PASSWORD);

if ( (!$ftp_connection) || (!$ftp_result) ) {
    trigger_error('FTP connection failed', E_USER_ERROR);
}

// Temp file
$temp = tmpfile();
$srcf = fopen('php://input', 'r');
$size = stream_copy_to_stream($srcf, $temp, $MAXSIZE);

// No input?
if ($size === 0) {
    http_response('Empty input');
} elseif ($size >= $MAXSIZE) {
    http_response('Request entity larger than or equal to ' . $MAXSIZE . ' B', '413 Request Entity Too Large');
}

// Set head back to 0
fseek($temp, 0);

// Here we should probably check if the file is indeed a .png
// ...

// Initate the upload
$upload = ftp_nb_fput($ftp_connection, $filename, $temp, FTP_BINARY);
while ($upload == FTP_MOREDATA) {
   // Continue upload...
   $upload = ftp_nb_continue($ftp_connection);
}
if ($upload != FTP_FINISHED) {
    echo "There was an error uploading the file...";
    exit();
}

fclose($temp);

# Respond with the url
header('HTTP/1.1 201 Created');
header('Content-Type: text/plain; charset=utf-8');
header('Content-Length: '.strlen($url));
echo $url;

?>