<?php

/*

0.0.6
- fixed scraping after changes on youtube website

0.0.5
- read YOUTUBE_QUALITY setting from /conf/config

0.0.4
- added fmt_map (quality map) handling to support 1080p, 720p, 480p, 360p, 270p based on user setting

0.0.3
- user private videos supported (270p quality only)

0.0.2
- support for videos which require age confirmation (270p quality only)

0.0.1
- 720p quality videos / restricted videos playback supported

todo:
- direct web autentification to support all videos in >270p quality (if available) and shared private videos of other users

*/

session_id('youtube');
session_start();

if (count($_SESSION) > 1024) {
  $_SESSION = array();
}

if ( $_SERVER['REQUEST_METHOD'] === 'POST' ) {
  postreq();
} else {
  if ($_GET['id']) {
    getvideo();
  }
  else {
    videolist();
  }
}

function videolist() {


  $head = "Host: gdata.youtube.com" . "\r\n" . "X-GData-Device:" . $_SERVER[HTTP_X_GDATA_DEVICE] . "\r\n";

  $headers = apache_request_headers();

  if ($headers['Authorization']) $head = $head . "Authorization:" . $headers['Authorization'] . "\r\n";
  if ($_SERVER['HTTP_GDATA_VERSION']) $head = $head . "GData-Version:" . $_SERVER['HTTP_GDATA_VERSION'] . "\r\n";

  $http = array(
    'method'=>"GET",
    'header'=> $head
  );

  $opts = array('http'=> $http);
  $url = "http://74.125.43.118" . str_replace("&amp;", '&', $_SERVER[REQUEST_URI]);
  $context = stream_context_create($opts);
	$xmlfeed = file_get_contents($url, false, $context);
	$reader = new XMLReader();
	$reader->XML($xmlfeed);
	while ($reader->read()) {
		if (($reader->nodeType == XMLReader::ELEMENT) && ($reader->localName == 'entry')) {
			do {
				$reader->read();
				if (($reader->localName == "content") && ($reader->getAttribute('yt:format') == 3)) {
             $link = $reader->getAttribute('url');
						}
				if ($reader->localName == "videoid") {
				     $reader->read();
				     if ($reader->nodeType == XMLReader::TEXT) {
               $id = $reader->value;
             }
						}
			} while (!(($reader->nodeType == XMLReader::END_ELEMENT) && ($reader->localName == 'entry')));
			$_SESSION['id_' . str_replace("-","_",$id)] = $link;
		}
	}
  $xmlfeed = str_replace("yt:format='5'", "yt:format='3'", $xmlfeed);
	echo $xmlfeed;
}

function getvideo() {

  $url = "http://www.youtube.com/watch?v=" . $_GET['id'];
  $html = file_get_contents($url);

  if(preg_match('/&video_id=(.*?)&/', $html, $id) && preg_match('/&t=(.*?)&/', $html, $t) && preg_match('/&fmt_map=(.*?)&/', $html, $fmt_map)) {
    $var_id = $id[1];
    $var_t  = $t[1];
    $var_fmt_map = $fmt_map[1];

	  $quality = "270P";

	  if (file_exists('/conf/config')) {
	    $config = file_get_contents('/conf/config');
      if(preg_match('/YOUTUBE_QUALITY=\'(.+)\'/', $config, $config_quality)) {
        $quality = $config_quality[1];
      }
    }

    $quality_map = array('1080P' => 37, '720P' => 22, '480P' => 35, '360P' => 34, '270P' => 18);
    $quality_map_values = array_values($quality_map);

    foreach (split(",",urldecode($var_fmt_map)) as $key) {
      list($current_list[],$rest) = split("/",$key,2);
    }

    $index = array_search($quality_map[$quality], $quality_map_values);
    while (!in_array($quality_map_values[$index], $current_list) && ($index < (count($quality_map_values) - 1))) {
      $index++;
    }

    $quality = $quality_map_values[$index];

    $url = "http://www.youtube.com/get_video?video_id=".$var_id."&t=".$var_t."&fmt=".$quality;

    $opts = array(
	    'http' => array(
		    'method' => "GET",
	      'max_redirects' => '0'
	    )
    );

    $context = stream_context_create($opts);
    $html = @file_get_contents($url, false, $context);
    foreach ($http_response_header as $header) {
      if(preg_match('/Location: (.+)/',$header,$link)) {
        echo "<?xml?><entry><media:group><media:content url='" . str_replace('&', "&amp;", $link[1]) . "' yt:format='3'/></media:group></entry>";
      }
    }
  } else {
    echo "<?xml?><entry><media:group><media:content url='" . str_replace('&', "&amp;", ($_SESSION['id_' . str_replace("-","_",$_GET['id'])])) . "' yt:format='3'/></media:group></entry>";
  }
}

function postreq() {

  $postdata = trim(file_get_contents('php://input'));

  $headers = apache_request_headers();

  $opts = array(
	  'http' => array(
		  'method' => "POST",
	    'header' => "X-GData-Key: " . $_SERVER[HTTP_X_GDATA_KEY] . "\r\n" . "X-Gdata-Client: " . $_SERVER[HTTP_X_GDATA_CLIENT] . "\r\n" . "Authorization: " . $headers[Authorization] . "\r\n" . "GData-Version: 2" . "\r\n" . "Content-Type: application/atom+xml" . "\r\n",
	    'content' => $postdata
	  )
  );

  $fp = fsockopen("74.125.43.118", 80, $errno, $errstr, 30);
  if ($fp) {
    $out  = "POST " . $_SERVER[REQUEST_URI] . " HTTP/1.0\r\n";
    $out .= "Host: gdata.youtube.com\r\n";
    $out .= "Content-Length: " . strlen($opts["http"]["content"]) ."\r\n";
    $out .= "Connection: Close\r\n";
    $out .= $opts["http"]["header"];
    $out .= "\r\n";
    $out .= $opts["http"]["content"];
    fwrite($fp, $out);
    $buff = "";
    while (!feof($fp)) {
      $buff .= fgets($fp, 4096);
    }
    fclose($fp);
    list($header, $body) = split("\r\n\r\n", $buff);
    header("HTTP/1.0 201 Created");
    echo $body;
  }
}

?>