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<?php
/* vim:set tabstop=8 softtabstop=8 shiftwidth=8 noexpandtab: */
/*
* Recommendation Class
*
* PHP version 5
*
* LICENSE: GNU General Public License, version 2 (GPLv2)
* Copyright (c) 2001 - 2011 Ampache.org All Rights Reserved
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License v2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* @category Recommendation
* @package Ampache
* @author Karl Vollmer <vollmer@ampache.org>
* @copyright 2001 - 2011 Ampache.org
* @license http://opensource.org/licenses/gpl-2.0 GPLv2
* @version PHP 5.2
* @link http://www.ampache.org/
* @since File available since Release 1.0
*/
/**
* Recommendation Class
*
* Description here...
*
* @category Recommendation
* @package Ampache
* @author Karl Vollmer <vollmer@ampache.org>
* @copyright 2001 - 2011 Ampache.org
* @license http://opensource.org/licenses/gpl-2.0 GPLv2
* @version Release: 3.6
* @link http://www.ampache.org/
* @since Class available since Release 1.0
*/
class Recommendation {
/**
* Constructor
* Not on my watch, boyo.
*/
private function __construct() {
return false;
} //constructor
/**
* get_lastfm_results
* Runs a last.fm query and returns the parsed results
*/
private static function get_lastfm_results($method, $query) {
$api_key = Config::get('lastfm_api_key');
$api_base = "http://ws.audioscrobbler.com/2.0/?method=";
$url = $api_base . $method . '&api_key=' . $api_key . '&' . $query;
debug_event('Recommendation', 'search url : ' . $url, 5);
$snoopy = new Snoopy();
if(Config::get('proxy_host') AND Config::get('proxy_port')) {
$snoopy->proxy_user = Config::get('proxy_host');
$snoopy->proxy_port = Config::get('proxy_port');
$snoopy->proxy_user = Config::get('proxy_user');
$snoopy->proxy_pass = Config::get('proxy_pass');
}
$snoopy->fetch($url);
$content = $snoopy->results;
return simplexml_load_string($content);
} // get_lastfm_results
/**
* get_songs_like
* Returns a list of similar songs
*/
public static function get_songs_like($song_id, $limit = 5, $local_only = true) {
$song = new Song($song_id);
if (isset($song->mbid)) {
$query = 'mbid=' . rawurlencode($song->mbid);
}
else {
$query = 'track=' . rawurlencode($song->title);
}
if ($limit && !$local_only) {
$query .= "&limit=$limit";
}
$xml = self::get_lastfm_results('track.getsimilar', $query);
foreach ($xml->similartracks->children() as $child) {
$name = $child->name;
$local_id = null;
$artist_name = $child->artist->name;
$s_artist_name = Catalog::trim_prefix($artist_name);
$s_artist_name = Dba::escape($s_artist_name['string']);
$sql = "SELECT `song`.`id` FROM `song` " .
"LEFT JOIN `artist` ON " .
"`song`.`artist`=`artist`.`id` WHERE " .
"`song`.`title`='" . Dba::escape($name) .
"' AND `artist`.`name`='$s_artist_name'";
$db_result = Dba::read($sql);
if ($result = Dba::fetch_assoc($db_result)) {
$local_id = $result['id'];
}
if (is_null($local_id)) {
debug_event('Recommendation', "$name did not match any local song", 5);
if (! $local_only) {
$results[] = array(
'id' => null,
'title' => $name,
'artist' => $artist_name
);
}
}
else {
debug_event('Recommendation', "$name matched local song $local_id", 5);
$results[] = array(
'id' => $local_id,
'title' => $name
);
}
if ($limit && count($results) >= $limit) {
break;
}
}
if (isset($results)) {
return $results;
}
return false;
}
/**
* get_artists_like
* Returns a list of similar artists
*/
public static function get_artists_like($artist_id, $limit = 5, $local_only = true) {
$artist = new Artist($artist_id);
$query = 'artist=' . rawurlencode($artist->name);
if ($limit && !$local_only) {
$query .= "&limit=$limit";
}
$xml = self::get_lastfm_results('artist.getsimilar', $query);
foreach ($xml->similarartists->children() as $child) {
$name = $child->name;
$local_id = null;
// First we check by MBID
if ((string)$child->mbid) {
$mbid = Dba::escape($child->mbid);
$sql = "SELECT `id` FROM `artist` WHERE `mbid`='$mbid'";
$db_result = Dba::read($sql);
if ($result = Dba::fetch_assoc($db_result)) {
$local_id = $result['id'];
}
}
// Then we fall back to the less likely to work exact
// name match
if (is_null($local_id)) {
$searchname = Catalog::trim_prefix($name);
$searchname = Dba::escape($searchname['string']);
$sql = "SELECT `id` FROM `artist` WHERE `name`='$searchname'";
$db_result = Dba::read($sql);
if ($result = Dba::fetch_assoc($db_result)) {
$local_id = $result['id'];
}
}
// Then we give up
if (is_null($local_id)) {
debug_event('Recommendation', "$name did not match any local artist", 5);
if (! $local_only) {
$results[] = array(
'id' => null,
'name' => $name
);
}
}
else {
debug_event('Recommendation', "$name matched local artist " . $local_id, 5);
$results[] = array(
'id' => $local_id,
'name' => $name
);
}
// Don't do more work than we have to
if ($limit && count($results) >= $limit) {
break;
}
}
if (isset($results)) {
return $results;
}
return false;
} // get_artists_like
} // end of recommendation class
?>
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