future-rss.php

for news RSS to HTML as ASP

<?php
//
// future-rss.php Delayed RSS Item Publisher
// Version 1.0.1
//
// Copyright 2005,2006 NotePage, Inc. all rights reserved
// http://www.feedforall.com
// NotePage, Inc. grants registerd users of our FeedForAll and/or
// FeedForAll Mac product(s) the right to install and use the
// future-rss.php script free of charge.  Please refer to the EULA
// included in the download for full license terms and conditions.
//
#-------------------------------------------
# Script setup area
#-------------------------------------------

# $cfg["rss_feed"]='http://www.mydomain.com/myfeed.xml';
$cfg["rss_feed"]='myfeed.xml';


$cfg['fetch_method'] = "fopen"; // fopen, curl
$cfg['url_override'] = true;   // Warning! security unsafe! 
                               // use "url" parameter to pass RSS feed to script
                               // example: http://localhost/rss_proxy.php?url=<url>
			       
$cfg["filter_method"] = "time"; // time - display item if ITEM_TIME <= CURRENT_TIME
                                // date - display item if ITEM_TIME <= endOfDay(CURRENT_TIME)


#-------------------------------------------
# Script 
# plz, do not change anything below this line
#-------------------------------------------

# override RSS feed location from URL param
if ($cfg['url_override'] && $_REQUEST["url"] ) $cfg["rss_feed"] = $_REQUEST["url"];

# fetch
$rss = rss_fetch();

# check
if (!rss_isValid($rss)) rss_error("Not a valid RSS feed");

# filter
$rss = rss_filter($rss);

# output
Header("Content-Type: text/xml");
echo $rss;
exit;



function rss_fetch() {
  global $cfg;

  // DO NOT allow use file://
  if (substr($cfg["rss_feed"],0, 7) == 'file://') {
    if (!$result) rss_error("file:// not allowed");
  }
  
  // fallback to fopen if NOT remote file
  if (substr($cfg["rss_feed"],0, 4) != 'http') {
    $cfg["fetch_method"] = 'fopen';
    
     // security check: file must be in current path or lower
     $root = dirname(realpath($_SERVER["SCRIPT_FILENAME"]));
     $feed_path = dirname(realpath($_SERVER["DOCUMENT_ROOT"]."/".$cfg ["rss_feed"]));

     if (substr_count($feed_path, $root) != 1) {
       if (file_exists($_SERVER["DOCUMENT_ROOT"]."/".$cfg["rss_feed"]))
         rss_error("Security violation");
       else     
         rss_error("Feed not found");
     }
  }

  if ($cfg["fetch_method"] == 'fopen') {
    $result = @file($cfg["rss_feed"]);
    if (!$result) rss_error("Could not open RSS feed at ".$cfg["rss_feed"]);
    return join("",$result);
  }


  if ($cfg["fetch_method"] == 'curl') {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $cfg["rss_feed"]);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    
    ob_start();
    curl_exec($ch);
    $result = ob_get_contents(); ob_end_clean();

    if (curl_errno($ch)) { rss_error("CURL Error: ".curl_error($ch)); }
    curl_close($ch);

    return $result;
  }

}

function rss_isValid($rss) {
  if (substr_count($rss,"<rss") ==0) return false;
  if (substr_count($rss,"<?xml") ==0) return false;
  if (substr_count($rss,"<channel") ==0) return false;
  if (substr_count($rss,"<title") ==0) return false;
  return true;
}

/*
  Filter rss items
*/
function rss_filter($rss) {
  function make_seed(){list($usec, $sec) = explode(' ', microtime());return (float) $sec + ((float) $usec * 100000);}
  srand(make_seed());

  # Preserve CDATA fields
  $cdata_array=array();
  preg_match_all('/<\!\[CDATA\[(.*?)\]\]/is', $rss, $tmp);
  foreach($tmp[0] as $k => $v) {
    $id = "CDATA".rand(1, 10000000)."CDATA";
    $rss = str_replace($v, $id, $rss);
    $cdata_array[ $id ] = $v;
  }

  # Extract all RSS items
  preg_match_all('/<item>(.*?)<\/item>/is', $rss, $tmp);
  $rss_array = $tmp[0];

  # Replace all items with ID
  $rss_array2 = array();
  foreach($rss_array as $k => $v) {
    $id = "RSS".rand(1, 10000000)."RSS";
    $rss = str_replace($v, $id, $rss);
    $rss_array2[ $id ] = $v;
  }
  $rss_array = $rss_array2;

  # Filter RSS News
  foreach($rss_array as $k => $v) {
    if (rss_filter2($v)) $rss_array[$k] = '';
  }

  # Replace back
  foreach($rss_array as $k => $v) {
    $rss = str_replace($k, $v, $rss);
  }


  # Restore CDATA
  foreach($cdata_array as $k => $v) {
    $rss = str_replace($k, $v, $rss);
  }

  return $rss;
}

/*
  returns true if RSS Item should NOT be visible
*/
function rss_filter2($rss) {
  global $cfg;
  
  # Extract pubDate
  if (!preg_match('/<pubDate>(.*?)<\/pubDate>/is', $rss, $out)) return false;

  $pubDate = $out[1];
  $pubDate_unix = strtotime($pubDate);
  
  $filterDate = time();

  // If filter=date display all today items
  if ($cfg["filter_method"] == 'date') $filterDate = mktime( 23, 59, 59, date("m",$filterDate), date("d",$filterDate), date("Y",$filterDate) );
  
  
  if ( $pubDate_unix > $filterDate) return true;

  return false;
}



function rss_error($error) {
  $now = date("r");
  $error_text=<<<EOF
<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0">

<channel>
<title>RSS Proxy</title>
<description>Error</description>
<language>en</language>
<item>
 
 <link>http://</link>
 <pubDate>$now</pubDate>
 <title>Error in RSS Feed</title>
 <description>$error</description>
 </item>

</channel>
</rss>
EOF;
  die($error_text);
}

?>