Vattoz resolver for Playdar

playdar-vattoz.php

#!/usr/bin/php
<?php

$in = fopen('php://STDIN','r');

// report our settings before entering the main query loop:
send_reply(get_settings());

// main loop: wait for a query, try and find match and reply.
while (!feof($in)){      
    // read $len bytes for the actual payload and assume it's a JSON object.
    $len = unpack('N', fread($in, 4));
    $q = json_decode(fread($in, $len[1]));
    if (!is_object($q))
      continue;
    
    $results = get_matches($q);
    
    // don't reply with anything if there were no matches:
    if (empty($results)) 
      continue;
    
    send_reply((object) array(
      '_msgtype' => 'results',
      'qid' => $q->qid,
      'results' => $results,
    ));
}

// put a 4-byte big-endian int first, denoting length of message
function send_reply($obj){
    $str = str_replace('\/','/',json_encode($obj)); // i think json_spirit rejects \/ even tho it's valid json. doh.
    print pack('N', strlen($str)) . $str;
}


function get_matches($q){
    $params = array(
     'query' => sprintf('"%s" "%s"', $q->artist, $q->track),
    );    
    
    $url = 'http://www.vattoz.com/Services/Search.aspx';
    $json = file_get_contents($url, NULL, stream_context_create(array('http' => array('method' => 'POST', 'content' => http_build_query($params)))));
    
    $json = str_replace('"', '\"', $json);
    $json = preg_replace('/\\\\./', '', $json); // something's causing errors in PHP's json_decode
    
    $json = str_replace(array(":'", "',", "' ,"), array(':"', '",', '",'), $json);
    $json = str_replace(array('id:', 'title:', 'duration:'), array('"id":', '"title":', '"duration":'), $json); // fix invalid JSON
    
    $data = json_decode($json);
    
    if (!is_array($data) || empty($data))
      return array();
    
    $items = array();
    foreach ($data as $item){
      preg_match('/(.+?)\s+-\s+(.+)/', $item->title, $matches);      
      
      $output = (object) array(
        'artist' =>  empty($matches) ? $q->artist : $matches[1],
        'track' => empty($matches) ? $q->track : $matches[2],
        'album' => 'Unknown',
        'mimetype' => 'audio/mpeg',
        
        'source' => 'Vattoz',
        'url' => sprintf('http://www.vattoz.com/Services/Get.aspx?fn=%s.mp3', $item->id),

        'bitrate' => 128, // hardcoded
        
        'duration' => $item->duration,
        'size' => round((($item->duration / 60) * 1024 * 1024)),
      );

      if (!empty($matches) && strtolower($output->artist) == strtolower($q->artist) && strtolower($output->track) == strtolower($q->track))
        $output->score = (float) 1.0;
      else
        $output->score = (float) 0.5;
      
      $items[] = $output;
    }
      
    return $items;
}

// settings for this resolver, reported when we start:
function get_settings(){
  return (object) array(
    '_msgtype' => 'settings',
    'name' => 'Vattoz resolver script',
    'targettime' => 2000, // ms
    'weight' => 50, // 1-100. higher means preferable.
  );
}