portal/patient/fwk/libs/verysimple/RSS/Writer.php

   1 <?php
   2 /** @package    verysimple::RSS */
   3 require_once("verysimple/XML/XMLUtil.php");
   4
   5 /**
   6  * A API for writing RSS feeds
   7  *
   8  * @package verysimple::RSS
   9  * @link http://www.110mb.com/forum/how-to-make-a-rss-feed-with-php-t11030.0.html
  10  * @version 1.1
  11  * @example require_once('verysimple/RSS/Writer.php');
  12  *          $rss_writer = new RSS_Writer('Channel','www.dev.nul','Feed Title');
  13  *          $rss_writer->setLanguage('us-en');
  14  *          $rss_writer->addCategory("Category Name");
  15  *          $rss_writer->addItem("Title","http://...",'Category Name','Author',date(DATE_RSS,strtotime('2008-01-04: 01:01:01')));
  16  *          $rss_writer->writeOut();
  17  */
  18 class RSS_Writer
  19 {
  20     protected $channel;
  21     private $title;
  22     private $link;
  23     private $description;
  24     private $rss_dom;
  25     private $rss_simplexml;
  26     protected $item_list;
  27     protected $item_counter;
  28
  29     /**
  30      * Instantiate an RSS_Writer
  31      *
  32      * @param string $channel_title
  33      * @param string $channel_link
  34      * @param string $channel_description
  35      * @param string $generator
  36      *          [optional]
  37      * @param string $docs
  38      *          [optional]
  39      */
  40     public function __construct($channel_title, $channel_link, $channel_description, $generator = "RSS_Writer", $docs = "http://cyber.law.harvard.edu/rss/rss.html")
  41     {
  42         $this->item_list = array ();
  43         $this->item_counter = 0;
  44         $this->rss_dom = new DOMDocument('1.0', 'UTF-8');
  45         $rss_node = $this->elementCreate($this->rss_dom, 'rss', '', array (
  46                 'version' => '2.0'
  47         ));
  48         $this->channel = $this->elementCreate($rss_node, 'channel');
  49         $this->title = $this->elementCreate($this->channel, 'title', $channel_title);
  50         $this->link = $this->elementCreate($this->channel, 'link', $channel_link);
  51         $this->description = $this->elementCreate($this->channel, 'description', $channel_description);
  52         $this->elementCreate($this->channel, 'lastBuildDate', date(DATE_RSS), false, false);
  53         $this->elementCreate($this->channel, 'generator', $generator, false, false);
  54         $this->elementCreate($this->channel, 'docs', $docs, false, false);
  55         $this->rss_simplexml = simplexml_import_dom($this->rss_dom);
  56     }
  57     private function elementCreate($parent_node, $node_name, $content = '', $attributes = false, $return = true)
  58     {
  59         $content = XMLUtil::Escape($content);
  60
  61         $element = $this->rss_dom->createElement($node_name, $content);
  62         if ($attributes) {
  63             foreach ($attributes as $key => $value) {
  64                 $element->setAttribute($key, $value);
  65             }
  66         }
  67
  68         $parent_node->appendChild($element);
  69         if ($return) {
  70             return $element;
  71         } else {
  72             return false;
  73         }
  74     }
  75     protected function elementSet($parent_node, $xpath, $node_name, $value, $attributes = false)
  76     {
  77         $result = $this->rss_simplexml->xpath($xpath . $node_name);
  78         if ($result) {
  79             $result [0] = $value;
  80
  81             if ($attributes) {
  82                 foreach ($attributes as $key => $value) {
  83                     $result [0] [$key] = $value;
  84                 }
  85             }
  86         } else {
  87             $this->elementCreate($parent_node, $node_name, $value, $attributes, false);
  88         }
  89     }
  90     public function setLanguage($language = 'en-us')
  91     {
  92         $this->elementSet($this->channel, '/channel/', 'language', $language);
  93     }
  94     public function addCategory($category)
  95     {
  96         $this->elementCreate($this->channel, 'category', $category);
  97     }
  98     public function addImage($url, $width = 88, $height = 31, $description = 'channel image')
  99     {
 100         $image = $this->elementCreate($this->channel, 'image');
 101         $this->elementCreate($image, 'url', $url);
 102
 103         if ($width > 144) {
 104             $width = 144;
 105         }
 106
 107         if ($height > 400) {
 108             $height = 400;
 109         }
 110
 111         $this->elementCreate($image, 'width', $width);
 112         $this->elementCreate($image, 'height', $height);
 113
 114         $this->elementCreate($image, 'title', $this->title->nodeValue);
 115         $this->elementCreate($image, 'link', $this->link->nodeValue);
 116
 117         $this->elementCreate($image, 'description', $description);
 118     }
 119     public function addItem($title, $link, $description, $author, $date, $source = '', $guid = '')
 120     {
 121         $this->item_counter ++;
 122         if (! $guid) {
 123             $guid = 'item' . $this->item_counter;
 124         }
 125
 126         $item_element = $this->elementCreate($this->channel, 'item', '', false, true);
 127         $this->elementCreate($item_element, 'title', $title);
 128         $this->elementCreate($item_element, 'link', $link);
 129         $this->elementCreate($item_element, 'description', $description);
 130         $this->elementCreate($item_element, 'author', $author);
 131         $this->elementCreate($item_element, 'guid', $guid);
 132         $this->elementCreate($item_element, 'pubDate', $date);
 133         if ($source) {
 134             $this->elementCreate($item_element, 'source', $source);
 135         }
 136
 137         $this->item_list [$this->item_counter] = $item_element;
 138     }
 139     public function addEnclosure($url, $type)
 140     {
 141         $item_element = $this->item_list [$this->item_counter];
 142         $curl = curl_init($url);
 143         if (! $curl || ! $item_element) {
 144             return false;
 145         } else {
 146             curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
 147             curl_setopt($curl, CURLOPT_HEADER, 1);
 148             curl_setopt($curl, CURLOPT_NOBODY, 1);
 149             curl_exec($curl);
 150             $size = curl_getinfo($curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD);
 151             curl_close($curl);
 152         }
 153
 154         $this->elementCreate($item_element, 'enclosure', '', array (
 155                 'url' => $url,
 156                 'length' => $size,
 157                 'type' => $type
 158         ), false);
 159     }
 160
 161     /**
 162      * returns RSS xml
 163      *
 164      * @return string RSS
 165      *
 166      */
 167     public function returnXML()
 168     {
 169         return $this->rss_dom->saveXML();
 170     }
 171
 172     /**
 173      * Writes out the XML header and content to the browser
 174      */
 175     public function writeOut()
 176     {
 177         header("Content-Type: text/xml");
 178         echo $this->returnXML();
 179     }
 180 }