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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
-*
-*/
-
-namespace OCA\News;
-
-// load SimplePie library
-//TODO: is this a suitable place for the following require?
-require_once 'news/3rdparty/SimplePie/autoloader.php';
-
-class Utils {
-
- /**
- * @brief Transform a date from UNIX timestamp format to MDB2 timestamp format
- * @param dbtimestamp a date in the UNIX timestamp format
- * @returns a date in the MDB2 timestamp format, or NULL if an error occurred
- */
- public static function unixtimeToDbtimestamp($unixtime) {
- if ($unixtime === null) {
- return null;
- }
- $dt = \DateTime::createFromFormat('U', $unixtime);
- if ($dt === false) {
- return null;
- }
- return $dt->format('Y-m-d H:i:s');
- }
-
- /**
- * @brief Transform a date from MDB2 timestamp format to UNIX timestamp format
- * @param dbtimestamp a date in the MDB2 timestamp format
- * @returns a date in the UNIX timestamp format, or NULL if an error occurred
- */
- public static function dbtimestampToUnixtime($dbtimestamp) {
- if ($dbtimestamp === null) {
- return null;
- }
- $dt = \DateTime::createFromFormat('Y-m-d H:i:s', $dbtimestamp);
- if ($dt === false) {
- return null;
- }
- return $dt->format('U');
- }
-
- /**
- * @brief Fetch a feed from remote
- * @param url remote url of the feed
- * @returns an instance of OC_News_Feed
- */
- public static function fetch($url) {
- $spfeed = new \SimplePie_Core();
- $spfeed->set_feed_url( $url );
- $spfeed->enable_cache( false );
-
- if (!$spfeed->init()) {
- return null;
- }
-
- //temporary try-catch to bypass SimplePie bugs
- 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();
- $item = new Item($itemUrl, $itemTitle, $itemGUID, $itemBody);
-
- $spAuthor = $spitem->get_author();
- if ($spAuthor !== null) {
- $item->setAuthor($spAuthor->get_name());
- }
-
- //date in Item is stored in UNIX timestamp format
- $itemDate = $spitem->get_date('U');
- $item->setDate($itemDate);
-
- // associated media file, for podcasts
- $itemEnclosure = $spitem->get_enclosure();
- if($itemEnclosure !== null) {
- $enclosureType = $itemEnclosure->get_type();
- $enclosureLink = $itemEnclosure->get_link();
- if(stripos($enclosureType, "audio/") !== FALSE) {
- $enclosure = new Enclosure();
- $enclosure->setMimeType($enclosureType);
- $enclosure->setLink($enclosureLink);
- $item->setEnclosure($enclosure);
- }
- }
-
- $items[] = $item;
- }
- }
-
- $feed = new Feed($url, $title, $items);
-
- $favicon = $spfeed->get_image_url();
-
- if ($favicon !== null && self::checkFavicon($favicon)) { // use favicon from feed
- $feed->setFavicon($favicon);
- }
- else { // try really hard to find a favicon
- $webFavicon = self::discoverFavicon($url);
- if ($webFavicon !== null) {
- $feed->setFavicon($webFavicon);
- }
- }
- return $feed;
- }
- catch (Exception $e) {
- return null;
- }
- }
-
- /**
- * Perform a "slim" fetch of a feed from remote.
- * Differently from Utils::fetch(), it doesn't retrieve items nor a favicon
- *
- * @param url remote url of the feed
- * @returns an instance of OC_News_Feed
- */
- public static function slimFetch($url) {
- $spfeed = new \SimplePie_Core();
- $spfeed->set_feed_url( $url );
- $spfeed->enable_cache( false );
- $spfeed->set_stupidly_fast( true );
-
- if (!$spfeed->init()) {
- return null;
- }
-
- //temporary try-catch to bypass SimplePie bugs
- try {
- $title = $spfeed->get_title();
-
- $feed = new Feed($url, $title);
-
- return $feed;
- }
- catch (Exception $e) {
- return null;
- }
- }
-
- public static function checkFavicon($favicon) {
- if ($favicon === null || $favicon == false)
- return false;
-
- $file = new \SimplePie_File($favicon);
- // size in bytes
- $filesize = strlen($file->body);
-
- if($file->success && $filesize > 0 && $filesize < 50000) { //bigger files are not considered favicons
- $sniffer = new \SimplePie_Content_Type_Sniffer($file);
- if(substr($sniffer->get_type(), 0, 6) === 'image/') {
- $imgsize = getimagesize($favicon);
- if ($imgsize['0'] <= 32 && $imgsize['1'] <= 32) { //bigger images are not considered favicons
- return true;
- }
- }
- }
- return false;
- }
-
- public static function discoverFavicon($url) {
- //try webroot favicon
- $favicon = \SimplePie_Misc::absolutize_url('/favicon.ico', $url);
-
- if(self::checkFavicon($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(self::checkFavicon($favicon))
- return $favicon;
- }
- }
- }
- return null;
- }
-} \ No newline at end of file
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