<?php
/*
################################################################################
#
# HolzCast Player is now:
#
# SalamCast Podcast Player, August 25, 2012
#
# Copyright 2012 Karl Holz, newaeon _AT_ mac _DOT_ com
#
# http://www.salamcast.com
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
################################################################################
*/
class podcast {
private $ini;
private $podcast=array();
private $feeds=array();
function __construct($ini='') {
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate( "D, d M Y H:i:s" ) . "GMT");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
header("Content-type: application/json");
// use config with class name by default
if ($ini=='') { $ini=__CLASS__.'.ini'; $this->data=dirname(__FILE__).'/data/'; }
elseif (is_file($ini)) { $this->data=dirname(__FILE__).'/'.__CLASS__.'/'.basename($ini, '.ini').'/'; }
else { $this->data=dirname(__FILE__).'/'.__CLASS__.'/'.$_SERVER['PATH_INFO'].'/'; }
$this->ini = (is_file($ini)) ? parse_ini_file($ini) : parse_ini_string($ini);
// load ini configuration
if (! is_array($this->ini) || count($this->ini) < 1 ) die(" couldent load the configuration file");
// setup podcast cacheing for this webserver
$this->base='http://192.168.0.242/'.$_SERVER['SCRIPT_NAME'];
if (! array_key_exists("PATH_INFO", $_SERVER)) $_SERVER['PATH_INFO']="";
if (array_key_exists("HTTP_HOST", $_SERVER)) { $this->base='http://'.$_SERVER['HTTP_HOST'].$_SERVER['SCRIPT_NAME'].$_SERVER['PATH_INFO']; }
// data dir for files, make it if it's not there
if (! is_dir($this->data)) mkdir($this->data, 0751, TRUE);
// check if the user has queried an rss file
if (array_key_exists('QUERY_STRING',$_SERVER) && $_SERVER['QUERY_STRING'] != '') {
$this->uuid=$_SERVER['QUERY_STRING'];
echo $this;
exit();
}
// str2time format
// update automaticly evey week
$this->update="-1 Day";
// User Agent
$this->agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/536.25 (KHTML, like Gecko) Version/6.0 Safari/536.25";
if (array_key_exists("HTTP_USER_AGENT", $_SERVER)) { $this->agent=$_SERVER["HTTP_USER_AGENT"]; }
// invoke update and scan, return a list of found feeds
$this();
}
function __invoke() {
$this->load_feeds();
if (count($this->feeds) > 0 ) {
echo json_encode($this->feeds);
} else {
//Cli
$this->download_feeds();
$this->load_feeds();
echo json_encode($this->feeds);
}
exit();
}
function __toString() {
if (! is_file($this->data.$this->uuid)) die("The Feed you requested is not found");
header("Content-type: text/xml");
return file_get_contents($this->data.$this->uuid);
}
function __destruct() { return TRUE; }
function __set($key, $val){ $this->podcast[$key]=$val; return TRUE; }
function __get($key) {
if(array_key_exists($key,$this->podcast)) return $this->podcast[$key];
return;
}
function load_feeds() {
$this->feeds=array(); //reset
foreach (glob($this->data."*" ) as $g) {
$this->feeds[]=array(
'title' => $this->xslt_apply($g, $this->get_rss_title()),
'href' => $this->base.'?'.str_replace(array($this->data), array(''), $g)
);
}
}
/**
* Download and process each feed
*/
function download_feeds() { foreach ($this->ini as $k => $v) $this->process_feeds($k, $v); }
/**
* private functions
*/
private function process_feeds($title, $feed){
$xml_load=$this->get_from_url($feed, $this->update);
if ($xml_load != '' && preg_match('/^</', $xml_load)) {
$xsltmpl=$this->get_rss_xsl();
$ini= parse_ini_string($this->xslt_apply($xml_load, $xsltmpl));
if (array_key_exists('url', $ini) && count($ini['url']) > 0) {
foreach($ini['url'] as $k => $v) $this->process_feeds($ini['title'][$k], $v);
unlink($this->data.$this->uuid($feed).".xml");
} else {
$this->feeds[]=array(
'title' => $title,
'url' => $this->base.'?'.$this->uuid($feed),
'src' => $feed
);
}
}
}
private function xslt_apply($xml_load, $xsltmpl) {
$xml=new DOMDocument();
if (is_file($xml_load)) { $xml->load($xml_load); }
else { $xml->loadXML($xml_load); }
//loads XSL template file
$xsl=new DOMDocument();
$xsl->loadXML($xsltmpl);
//process XML and XSLT files and return result
$xslproc = new XSLTProcessor();
$xslproc->importStylesheet($xsl);
return $xslproc->transformToXml($xml);
}
/**
* XSLT to extract rss channel title
*/
private function get_rss_title() {
return <<<X
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="text"/>
<xsl:template match="/"><xsl:value-of select="/rss/channel/title"/></xsl:template>
</xsl:stylesheet>
X
;
}
/**
* Extract rss types from enclosure tags with XSLT 1.0
*/
private function get_rss_xsl() {
return <<<X
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="text"/>
<xsl:template match="/">[podcasts]<xsl:apply-templates select="/rss/channel/item"/>
</xsl:template>
<xsl:template match="/rss/channel/item">
<xsl:if test="enclosure/@type = 'application/rss+xml'">
title[]="<xsl:value-of select="title"/>"
url[]="<xsl:value-of select="enclosure/@url"/>"</xsl:if></xsl:template>
</xsl:stylesheet>
X
;
}
/**
* update cached file from url
*/
private function get_from_url($url, $time='-24 hours') {
$file=$this->data.$this->uuid($url).".xml";
if (! is_file($file) || filectime($file) > strtotime($time) ) { $this->cache_podcast($url); }
if (is_file($file)) return file_get_contents($file);
return ;
}
/**
* Genarates an UUID
* @author Anis uddin Ahmad, modified by Karl Holz
* @param string an optional prefix
* @return string the formated uuid
*/
private function uuid($key = null, $prefix =__CLASS__) {
$key = ($key == null)? $this->base : $key;
$chars = md5($key);
$uuid = substr($chars,0,8) . '-';
$uuid .= substr($chars,8,4) . '-';
$uuid .= substr($chars,12,4) . '-';
$uuid .= substr($chars,16,4) . '-';
$uuid .= substr($chars,20,12);
return $prefix .'-'. $uuid;
}
// @TODO add header checking for 404 etc
private function cache_podcast($url) {
$file=$this->data.$this->uuid($url).".xml";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
// mimic users web browser
curl_setopt($ch, CURLOPT_USERAGENT, $this->agent);
if ($xml = curl_exec($ch)) {
curl_close($ch);
file_put_contents($file, $xml);
return TRUE;
}
return FALSE;
}
}
?>
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