Soundcloud embed page, search and combining clientId and trackId to resource URL

souncloud-embed-player.md

TO GET TO MP3 file with JSON API of soundcloud

https://api.soundcloud.com/i1/tracks/160637550/streams?client_id=0f8fdbbaa21a9bd18210986a7dc2d72c&format=json

What we need to know is the trackID and the ClientID

TrackID can be found in the data-src="" attr

<iframe src="about:blank" frameborder="no" scrolling="no" width="100%" height="166" data-src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/160637550&amp;color=ff0000&amp;auto_play=false&amp;hide_related=false&amp;show_comments=true&amp;show_user=true&amp;show_reposts=false" class="npo_cc_social npo_cc_processed" cookiewall-checked="true"></iframe>

1. Test whether the page contains a soundcloud Iframe
2. Get the trackID from the data-source attribute of the Iframe tag, e.g. data-src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/160637550&color=ff0000&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false"
   • Test result: http://jsbin.com/xesovu/3/
3. Curl html data-src url page and hijack ajax request.

 <?php
 header('Access-Control-Allow-Origin: *');
    //Get the url
    $url = $_GET['url'];

    //Get the html of url
    function get_data($url) 
    { 
       $ch = curl_init();
       $timeout = 5;
       //$userAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US)AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.X.Y.Z Safari/525.13.";
       $userAgent = "IE 7 – Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)";
      curl_setopt($ch, CURLOPT_USERAGENT, $userAgent);
      curl_setopt($ch, CURLOPT_FAILONERROR, true);
      curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
      curl_setopt($ch, CURLOPT_AUTOREFERER, true);
      curl_setopt($ch, CURLOPT_TIMEOUT, 10);
      curl_setopt($ch,CURLOPT_URL,$url);
      curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
      curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
      $data = curl_exec($ch);
      curl_close($ch);
      return $data;
    }

    $html = file_get_contents($url);
    
?>

<script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
<script>
var parseQueryString = function( queryString ) {
  var params = {}, queries, temp, i, l;

  // Split into key/value pairs
  queries = queryString.split("&");

  // Convert the array of strings into an object
  for ( i = 0, l = queries.length; i < l; i++ ) {
      temp = queries[i].split('=');
      params[temp[0]] = temp[1];
  }
  return params;
};
// Hijack AJAX request 
(function(open) {
  XMLHttpRequest.prototype.open = function(method, url, async, user, pass) {
    var params = parseQueryString(url);
     window.location = "soundcloud_client.php?id=" + params.client_id;
     return false;
    open.call(this, method, rewrittenUrl, async, user, pass);
  };
})(XMLHttpRequest.prototype.open);
</script>

<?php 
// render HTML content 
echo $html;
?>

4. Parse the query string params from XMLHttpRequest url and get the ClientID.
5. Combine ClientID and TrackID to this URL

https://api.soundcloud.com/i1/tracks/:trackId/streams?client_id={clientID}c&format=json

6. Expect a response with the JSON containing the URL to the RAW mp3

{

    "http_mp3_128_url": "https://ec-media.soundcloud.com/04NJxfCMgsq7.128.mp3?f10880d39085a94a0418a7ef69b03d522cd6dfee9399eeb9a522019b6cfab73b60ebe4206b2df5f1926659b76ff0a24fae1baf7aff77090425dc3157adfd3dd71c6f8588f2&AWSAccessKeyId=AKIAJNIGGLK7XA7YZSNQ&Expires=1407329702&Signature=lfYdnqnoK20BgQLd92sczv88xu4%3D"

}