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<?php
/**
* ownCloud - News app
*
* @author Alessandro Cosentino
* Copyright (c) 2012 - Alessandro Cosentino <cosenal@gmail.com>
*
* This file is licensed under the Affero General Public License version 3 or later.
* See the COPYING-README file
*
*/
// load SimplePie library
//TODO: is this file a suitable place for the following require?
require_once('news/3rdparty/SimplePie/autoloader.php');
namespace OCA\News;
class Utils {
/**
* @brief Fetch a feed from remote
* @param url remote url of the feed
* @returns an instance of OC_News_Feed
*/
public static function fetch($url){
$spfeed = new SimplePie_Core();
$spfeed->set_feed_url( $url );
$spfeed->enable_cache( false );
if (!$spfeed->init()) {
return null;
}
//I understand this try-catch sucks, but SimplePie gives weird errors sometimes
try {
$spfeed->handle_content_type();
$title = $spfeed->get_title();
$items = array();
if ($spitems = $spfeed->get_items()) {
foreach($spitems as $spitem) {
$itemUrl = $spitem->get_permalink();
$itemTitle = $spitem->get_title();
$itemGUID = $spitem->get_id();
$itemBody = $spitem->get_content();
$items[] = new Item($itemUrl, $itemTitle, $itemGUID, $itemBody);
}
}
$feed = new Feed($url, $title, $items);
$favicon = $spfeed->get_image_url();
if ($favicon !== null) { // use favicon from feed
if(checkFavicon($favicon))
$feed->setFavicon($favicon);
}
else { // try really hard to find a favicon
if( null !== ($webFavicon = discoverFavicon($url)) )
$feed->setFavicon($webFavicon);
}
return $feed;
}
catch (Exception $e) {
return null;
}
}
public static function checkFavicon($favicon) {
$file = new SimplePie_File($favicon);
// size in bytes
$filesize = strlen($file->body);
if($file->success && $filesize > 0 && $filesize < 50000) {
$sniffer = new SimplePie_Content_Type_Sniffer($file);
if(substr($sniffer->get_type(), 0, 6) === 'image/') {
return true;
}
}
return false;
}
public static function discoverFavicon($url) {
//try webroot favicon
$favicon = SimplePie_Misc::absolutize_url('/favicon.ico', $url);
if(checkFavicon($favicon))
return $favicon;
//try to extract favicon from web page
$absoluteUrl = SimplePie_Misc::absolutize_url('/', $url);
$handle = curl_init ( );
curl_setopt ( $handle, CURLOPT_URL, $absoluteUrl );
curl_setopt ( $handle, CURLOPT_RETURNTRANSFER, 1 );
curl_setopt ( $handle, CURLOPT_FOLLOWLOCATION, TRUE );
curl_setopt ( $handle, CURLOPT_MAXREDIRS, 10 );
if ( FALSE!==($page=curl_exec($handle)) ) {
preg_match ( '/<[^>]*link[^>]*(rel=["\']icon["\']|rel=["\']shortcut icon["\']) .*href=["\']([^>]*)["\'].*>/iU', $page, $match );
if (1<sizeof($match)) {
// the specified uri might be an url, an absolute or a relative path
// we have to turn it into an url to be able to display it out of context
$favicon = htmlspecialchars_decode ( $match[2] );
// test for an url
if (parse_url($favicon,PHP_URL_SCHEME)) {
if(checkFavicon($favicon))
return $favicon;
}
// test for an absolute path
elseif ( 0===strpos(parse_url($favicon,PHP_URL_PATH),'/') ) {
$url_token = parse_url($meta['final']);
sprintf( '%s://%s/%s', $url_token['scheme'], $url_token['host'], $favicon );
if(checkFavicon($favicon))
return $favicon;
}
// so it appears to be a relative path
else {
$url_token = parse_url($meta['final']);
sprintf( '%s://%s%s%s', $url_token['scheme'], $url_token['host'], dirname($url_token['path']), $favicon );
if(checkFavicon($favicon))
return $favicon;
}
}
}
return null;
}
}
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