Extension:RSS Reader/cURLRSS

From mediawiki.org

cURLRSS is an alternative RSS parser used on lastRSS. It is designed to work with the RSS Reader extension. It provides an alternative to lastRSS that works with allow_url_fopen disabled, using the cURL library. For installations of PHP that use cURL instead of allow_url_fopen (such as DreamHost users) this is a good alternative.

Installation[edit]

Installing cURLRSS instead of lastRSS is not a big hassle. Copy and paste cURLRSS.php into a file with the same name in the folder where RSSReader.php is located.

Code[edit]

cURLRSS.php[edit]

<?php
/*
 * cURLRSS 0.1 - PHP class to parse RSS files without allow_url_fopen
 * Copyright (C) 2008  Artem Kaznatcheev
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License 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.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 **************************************************************************
 *                        ACKNOWLEDGMENT
 *
 * This class is a modification of an existing RSS parser called:  lastRSS
 * 0.9.1. lasRSS was created by Vojtech Semecky who can be  contacted at 
 * webmaster @ oslab . net. The original lastRSS "Simple yet powerful PHP
 * class to parse RSS files" was licensed under GPL, and this product 
 * follows in its footsteps. Please visit http://lastrss.oslab.net/ for
 * more information about lastRSS
 **************************************************************************
  **************************************************************************
 *                         cURLRSS INFO
 *
 * cURLRSS provides a way to retrieve and parse RSS feeds. For retrieving 
 * and parsing it mostly relies on the code that made lastRSS work, however
 * when fetching allow_url_fopen is not required. This makes the code
 * usable with hosts like DreamHost
 **************************************************************************
 */

class cURLRSS {
    // -------------------------------------------------------------------
    // Public properties
    // -------------------------------------------------------------------
    var $default_cp = 'UTF-8';
    var $CDATA = 'nochange';
    var $cp = '';
    var $items_limit = 0;
    var $stripHTML = False;
    var $date_format = '';

    // -------------------------------------------------------------------
    // Private variables
    // -------------------------------------------------------------------
    var $channeltags = array ('title', 'link', 'description', 'language', 'copyright', 'managingEditor', 'webMaster', 'lastBuildDate', 'rating', 'docs');
    var $itemtags = array('title', 'link', 'description', 'author', 'category', 'comments', 'enclosure', 'guid', 'pubDate', 'source');
    var $imagetags = array('title', 'url', 'link', 'width', 'height');
    var $textinputtags = array('title', 'description', 'name', 'link');

    // -------------------------------------------------------------------
    // Parse RSS file and returns associative array.
    // -------------------------------------------------------------------
    function Get ($rss_url) {
        // If CACHE ENABLED
        if ($this->cache_dir != '') {
            $cache_file = $this->cache_dir . '/rsscache_' . md5($rss_url);
            $timedif = @(time() - filemtime($cache_file));
            if ($timedif < $this->cache_time) {
                // cached file is fresh enough, return cached array
                $result = unserialize(join('', file($cache_file)));
                // set 'cached' to 1 only if cached file is correct
                if ($result) $result['cached'] = 1;
            } else {
                // cached file is too old, create new
                $result = $this->Parse($rss_url);
                $serialized = serialize($result);
                if ($f = @fopen($cache_file, 'w')) {
                    fwrite ($f, $serialized, strlen($serialized));
                    fclose($f);
                }
                if ($result) $result['cached'] = 0;
            }
        }
        // If CACHE DISABLED >> load and parse the file directly
        else {
            $result = $this->Parse($rss_url);
            if ($result) $result['cached'] = 0;
        }
        // return result
        return $result;
    }
    
    // -------------------------------------------------------------------
    // Modification of preg_match(); return trimed field with index 1
    // from 'classic' preg_match() array output
    // -------------------------------------------------------------------
    function my_preg_match ($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], array('<![CDATA['=>'', ']]>'=>''));
            } elseif ($this->CDATA == 'strip') { // Strip CDATA
                $out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
            }

            // If code page is set convert character encoding to required
            if ($this->cp != '')
                //$out[1] = $this->MyConvertEncoding($this->rsscp, $this->cp, $out[1]);
                $out[1] = iconv($this->rsscp, $this->cp.'//TRANSLIT', $out[1]);
            // Return result
            return trim($out[1]);
        } else {
        // if there is NO result, return empty string
            return '';
        }
    }

    // -------------------------------------------------------------------
    // Replace HTML entities &something; by real characters
    // -------------------------------------------------------------------
    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 &apos; entity (missing in HTML_ENTITIES)
        $trans_tbl += array('&apos;' => "'");
        // Replace entities by values
        return strtr ($string, $trans_tbl);
    }

    // -------------------------------------------------------------------
    // Parse() is private method used by Get() to load and parse RSS file.
    // Don't use Parse() in your scripts - use Get($rss_file) instead.
    // -------------------------------------------------------------------
    function Parse ($rss_url) {
        $rss_content = '';
      
        // Open and load RSS file
        $ch = curl_init();
        curl_setopt ($ch, CURLOPT_URL, $rss_url);
        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 5);
        $rss_content = curl_exec($ch);
        curl_close($ch);

        if ($rss_content != '') {
            // Parse document encoding
            $result['encoding'] = $this->my_preg_match("'encoding=[\'\"](.*?)[\'\"]'si", $rss_content);
            // if document codepage is specified, use it
            if ($result['encoding'] != '')
                { $this->rsscp = $result['encoding']; } // This is used in my_preg_match()
            // otherwise use the default codepage
            else
                { $this->rsscp = $this->default_cp; } // This is used in my_preg_match()

            // Parse CHANNEL info
            preg_match("'<channel.*?>(.*?)</channel>'si", $rss_content, $out_channel);
            foreach($this->channeltags as $channeltag)
            {
                $temp = $this->my_preg_match("'<$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
            preg_match("'<textinput(|[^>]*[^/])>(.*?)</textinput>'si", $rss_content, $out_textinfo);
                // This a little strange regexp means:
                // Look for tag <textinput> with or without any attributes, but skip truncated version <textinput /> (it's not beggining tag)
            if (isset($out_textinfo[2])) {
                foreach($this->textinputtags as $textinputtag) {
                    $temp = $this->my_preg_match("'<$textinputtag.*?>(.*?)</$textinputtag>'si", $out_textinfo[2]);
                    if ($temp != '') $result['textinput_'.$textinputtag] = $temp; // Set only if not empty
                }
            }
            // Parse IMAGE info
            preg_match("'<image.*?>(.*?)</image>'si", $rss_content, $out_imageinfo);
            if (isset($out_imageinfo[1])) {
                foreach($this->imagetags as $imagetag) {
                    $temp = $this->my_preg_match("'<$imagetag.*?>(.*?)</$imagetag>'si", $out_imageinfo[1]);
                    if ($temp != '') $result['image_'.$imagetag] = $temp; // Set only if not empty
                }
            }
            // Parse ITEMS
            preg_match_all("'<item(| .*?)>(.*?)</item>'si", $rss_content, $items);
            $rss_items = $items[2];
            $i = 0;
            $result['items'] = array(); // create array even if there are no items
            foreach($rss_items as $rss_item) {
                // If number of items is lower then limit: Parse one item
                if ($i < $this->items_limit || $this->items_limit == 0) {
                    foreach($this->itemtags as $itemtag) {
                        $temp = $this->my_preg_match("'<$itemtag.*?>(.*?)</$itemtag>'si", $rss_item);
                        if ($temp != '') $result['items'][$i][$itemtag] = $temp; // Set only if not empty
                    }
                    // Strip HTML tags and other bullshit from DESCRIPTION
                    if ($this->stripHTML && $result['items'][$i]['description'])
                        $result['items'][$i]['description'] = strip_tags($this->unhtmlentities(strip_tags($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;
        }
        else // Error in opening return False
        {
            return False;
        }
    }
}
?>