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|
<?php
new sc_audio();
class sc_audio{
public function __construct(){
include "lib/curlproxy.php";
$this->proxy = new proxy();
if(isset($_GET["u"])){
/*
we're now proxying audio
*/
$viewkey = $_GET["u"];
if(!isset($_GET["r"])){
$this->do404("Ranges(r) are missing");
}
$ranges = explode(",", $_GET["r"]);
// sanitize ranges
foreach($ranges as &$range){
if(!is_numeric($range)){
$this->do404("Invalid range specified");
}
$range = (int)$range;
}
// sort ranges (just to make sure)
sort($ranges);
// convert ranges to pairs
$last = -1;
foreach($ranges as &$r){
$tmp = $r;
$r = [$last + 1, $r];
$last = $tmp;
}
$browser_headers = getallheaders();
// get the requested range from client
$client_range = 0;
foreach($browser_headers as $key => $value){
if(strtolower($key) == "range"){
preg_match(
'/bytes=([0-9]+)/',
$value,
$client_regex
);
if(isset($client_regex[1])){
$client_range = (int)$client_regex[1];
}else{
$client_range = 0;
}
break;
}
}
if(
$client_range < 0 ||
$client_range > $ranges[count($ranges) - 1][1]
){
// range is not satisfiable
http_response_code(416);
header("Content-Type: text/plain");
die();
}
$rng = null;
for($i=0; $i<count($ranges); $i++){
if($ranges[$i][0] <= $client_range){
$rng = $ranges[$i];
}
}
// proxy data!
http_response_code(206); // partial content
header("Accept-Ranges: bytes");
header("Content-Range: bytes {$rng[0]}-{$rng[1]}/" . ($ranges[count($ranges) - 1][1] + 1));
$viewkey =
preg_replace(
'/\/media\/([0-9]+)\/[0-9]+\/[0-9]+/',
'/media/$1/' . $rng[0] . '/' . $rng[1],
$viewkey
);
try{
$this->proxy->stream_linear_audio(
$viewkey
);
}catch(Exception $error){
$this->do404("Could not read stream");
}
die();
}
/*
redirect user to correct resource
we need to scrape and store the byte positions in the result URL
*/
if(!isset($_GET["s"])){
$this->do404("The URL(s) parameter is missing");
}
$viewkey = $_GET["s"];
if(
preg_match(
'/soundcloud\.com$/',
parse_url($viewkey, PHP_URL_HOST)
) === false
){
$this->do404("This endpoint can only be used for soundcloud streams");
}
try{
$json = $this->proxy->get($viewkey)["body"];
}catch(Exception $error){
$this->do404("Curl error: " . $error->getMessage());
}
$json = json_decode($json, true);
if(!isset($json["url"])){
$this->do404("Could not get URL from JSON");
}
$viewkey = $json["url"];
$m3u8 = $this->proxy->get($viewkey)["body"];
$m3u8 = explode("\n", $m3u8);
$lineout = null;
$streampos_arr = [];
foreach($m3u8 as $line){
$line = trim($line);
if($line[0] == "#"){
continue;
}
if($lineout === null){
$lineout = $line;
}
preg_match(
'/\/media\/[0-9]+\/([0-9]+)\/([0-9]+)/',
$line,
$matches
);
if(isset($matches[0])){
$streampos_arr[] = [
(int)$matches[1],
(int)$matches[2]
];
}
}
if($lineout === null){
$this->do404("Could not get stream URL");
}
$lineout =
preg_replace(
'/\/media\/([0-9]+)\/[0-9]+\/[0-9]+/',
'/media/$1/0/0',
$lineout
);
$streampos = [];
foreach($streampos_arr as $pos){
$streampos[] = $pos[1];
}
$streampos = implode(",", $streampos);
header("Location: audio_sc?u=" . urlencode($lineout) . "&r=$streampos");
header("Accept-Ranges: bytes");
}
private function do404($error){
http_response_code(404);
header("Content-Type: text/plain");
header("X-Error: $error");
die();
}
}
|
