From addc5a14a93547f630f23e5b6a79cffa2e37d71a Mon Sep 17 00:00:00 2001
From: lolcat <will@lolcat.ca>
Date: Sat, 17 Feb 2024 23:22:19 -0500
Subject: boobs

---
 audio/sc.php | 223 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 223 insertions(+)
 create mode 100644 audio/sc.php

(limited to 'audio/sc.php')

diff --git a/audio/sc.php b/audio/sc.php
new file mode 100644
index 0000000..53d8164
--- /dev/null
+++ b/audio/sc.php
@@ -0,0 +1,223 @@
+<?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();
+	}
+}
-- 
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