<?php
/*
======================================================================
lastRSS 0.9.2
Simple yet powerfull PHP class to parse RSS files.
by Vojtech Semecky, webmaster @ webdot . cz
Latest version, features, manual and examples:
http://lastrss.webdot.cz/
modifed by https://instantcms.ru/
----------------------------------------------------------------------
LICENSE
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License (GPL)
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
To read the license please visit http://www.gnu.org/copyleft/gpl.html
======================================================================
*/
/**
* lastRSS
* Simple yet powerfull PHP class to parse RSS files.
*/
class lastRSS {
public $default_cp = 'UTF-8';
public $CDATA = 'content';
public $cp = '';
public $rsscp = '';
public $items_limit = 0;
public $stripHTML = false;
public $date_format = '';
public $cache_dir = '';
public $cache_time = 0;
private $channeltags = ['title', 'link', 'description', 'language', 'copyright', 'managingEditor', 'webMaster', 'lastBuildDate', 'rating', 'docs'];
private $itemtags = ['title', 'link', 'description', 'author', 'category', 'comments', 'enclosure', 'guid', 'pubDate', 'dc:date', 'source'];
private $imagetags = ['title', 'url', 'link', 'width', 'height'];
private $textinputtags = ['title', 'description', 'name', 'link'];
public function get($rss_url) {
$result = $this->getCached($rss_url);
if (!$result) {
$result = $this->parse($rss_url);
if ($result) {
$this->cacheResult($rss_url, $result);
$result['cached'] = 0;
}
}
return $result;
}
private function getCached($rss_url) {
if (!$this->cache_dir) {
return false;
}
$cache_dir = $this->cache_dir . '/rsscache/';
if (!is_dir($cache_dir)) {
mkdir($cache_dir, 0777);
}
$cache_file = $cache_dir . md5($rss_url);
if (!is_readable($cache_file)) {
return false;
}
$timedif = (time() - filemtime($cache_file));
if ($timedif < $this->cache_time) {
$result = include $cache_file;
if ($result) {
$result['cached'] = 1;
return $result;
} else {
unlink($cache_file);
}
} else {
unlink($cache_file);
}
return false;
}
private function cacheResult($rss_url, $result) {
if (!$this->cache_dir) {
return false;
}
$cache_dir = $this->cache_dir . '/rsscache/';
if (!is_dir($cache_dir)) {
mkdir($cache_dir, 0777);
}
$cache_file = $cache_dir . md5($rss_url);
file_put_contents($cache_file, '<?php return ' . var_export($result, true) . ';');
return true;
}
/**
* Modification of preg_match(); return trimed field with index 1
* from 'classic' preg_match() array output
*
* @param string $pattern
* @param string $subject
* @return string
*/
private function pregMatch($pattern, $subject) {
// start regullar expression
preg_match($pattern, $subject, $out);
// if there is some result... process it and return it
if (isset($out[1])) {
// Process CDATA (if present)
if ($this->CDATA == 'content') { // Get CDATA content (without CDATA tag)
$out[1] = strtr($out[1], ['<![CDATA[' => '', ']]>' => '']);
} elseif ($this->CDATA == 'strip') { // Strip CDATA
$out[1] = strtr($out[1], ['<![CDATA[' => '', ']]>' => '']);
}
// If code page is set convert character encoding to required
if ($this->cp != '') {
$out[1] = iconv($this->rsscp, $this->cp . '//TRANSLIT', $out[1]);
}
return trim($out[1]);
}
// if there is NO result, return empty string
return '';
}
/**
* Replace HTML entities &something; by real characters
*
* @param string $string
* @return string
*/
private function unhtmlentities($string) {
// Get HTML entities table
$trans_tbl = get_html_translation_table(HTML_ENTITIES, ENT_QUOTES);
// Flip keys<==>values
$trans_tbl = array_flip($trans_tbl);
// Add support for ' entity (missing in HTML_ENTITIES)
$trans_tbl += [''' => "'"];
// Replace entities by values
return strtr($string, $trans_tbl);
}
/**
* Parse() is private method used by get() to load and parse RSS file.
*
* @param string $rss_url
* @return array
*/
private function parse($rss_url) {
$result = [];
$rss_content = $this->getRssFromUrl($rss_url);
if (!$rss_content) {
return $result;
}
// Parse document encoding
$result['encoding'] = $this->pregMatch("'encoding=[\'\"](.*?)[\'\"]'si", $rss_content);
// if document codepage is specified, use it
if ($result['encoding']) {
$this->rsscp = $result['encoding'];
} // This is used in pregMatch()
// otherwise use the default codepage
else {
$this->rsscp = $this->default_cp;
} // This is used in pregMatch()
// Parse CHANNEL info
$out_channel = [];
preg_match("'<channel.*?>(.*)</channel>'si", $rss_content, $out_channel);
if (!empty($out_channel[1])) {
foreach ($this->channeltags as $channeltag) {
$temp = $this->pregMatch("'<$channeltag.*?>(.*?)</$channeltag>'si", $out_channel[1]);
if ($temp) {
$result[$channeltag] = $temp;
} // Set only if not empty
}
}
// If date_format is specified and lastBuildDate is valid
if ($this->date_format && ($timestamp = strtotime($result['lastBuildDate'])) !== -1) {
// convert lastBuildDate to specified date format
$result['lastBuildDate'] = date($this->date_format, $timestamp);
}
// Parse TEXTINPUT info
$out_textinfo = [];
preg_match("'<textinput(|[^>]*[^/])>(.*?)</textinput>'si", $rss_content, $out_textinfo);
// This a little strange regexp means:
// Look for tag <textinput> with or without any attributes, but skip truncated version <textinput /> (it's not beggining tag)
if (!empty($out_textinfo[2])) {
foreach ($this->textinputtags as $textinputtag) {
$temp = $this->pregMatch("'<$textinputtag.*?>(.*?)</$textinputtag>'si", $out_textinfo[2]);
if ($temp) {
$result['textinput_' . $textinputtag] = $temp;
} // Set only if not empty
}
}
// Parse IMAGE info
$out_imageinfo = [];
preg_match("'<image.*?>(.*?)</image>'si", $rss_content, $out_imageinfo);
if (!empty($out_imageinfo[1])) {
foreach ($this->imagetags as $imagetag) {
$temp = $this->pregMatch("'<$imagetag.*?>(.*?)</$imagetag>'si", $out_imageinfo[1]);
if ($temp) {
$result['image_' . $imagetag] = $temp;
} // Set only if not empty
}
}
// Parse ITEMS
$result['items'] = []; // create array even if there are no items
$items = [];
preg_match_all("'<item(| .*?)>(.*?)</item>'si", $rss_content, $items);
if(!empty($items[2])){
$i = 0;
foreach ($items[2] as $rss_item) {
// If number of items is lower then limit: Parse one item
if ($i < $this->items_limit || !$this->items_limit) {
foreach ($this->itemtags as $itemtag) {
$temp = $this->pregMatch("'<$itemtag.*?>(.*?)</$itemtag>'si", $rss_item);
if ($temp) {
$result['items'][$i][$itemtag] = $temp;
}
}
$temp = $this->pregMatch('#<enclosure url="([^"]+)#is', $rss_item);
if ($temp) {
$result['items'][$i]['enclosure'] = $temp;
}
// Strip HTML tags and other bullshit from DESCRIPTION
if ($this->stripHTML && !empty($result['items'][$i]['description'])) {
$result['items'][$i]['description'] = strip_tags(str_replace('><', '> <', $this->unhtmlentities(strip_tags(str_replace('><', '> <', $result['items'][$i]['description'])))));
}
// Strip HTML tags and other bullshit from TITLE
if ($this->stripHTML && $result['items'][$i]['title']) {
$result['items'][$i]['title'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['title'])));
}
// If date_format is specified and pubDate is valid
if ($this->date_format && ($timestamp = strtotime($result['items'][$i]['pubDate'])) !== -1) {
// convert pubDate to specified date format
$result['items'][$i]['pubDate'] = date($this->date_format, $timestamp);
}
// Item counter
$i++;
}
}
}
$result['items_count'] = $i;
return $result;
}
private function getRssFromUrl($url) {
if (function_exists('curl_init')) {
$curl = curl_init();
if (strpos($url, 'https') === 0) {
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
}
curl_setopt($curl, CURLOPT_USERAGENT, 'InstantCMS/'.cmsCore::getVersion().' ('.cmsConfig::get('language').')');
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HEADER, false);
curl_setopt($curl, CURLOPT_TIMEOUT, 5);
$data = curl_exec($curl);
curl_close($curl);
} else {
$data = false;
}
return $data;
}
}