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Diffstat (limited to 'utility/utils.php')
| -rw-r--r-- | utility/utils.php | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/utility/utils.php b/utility/utils.php new file mode 100644 index 000000000..560114ca7 --- /dev/null +++ b/utility/utils.php @@ -0,0 +1,208 @@ +<?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; + } +}
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