441 lines
11 KiB
PHP
441 lines
11 KiB
PHP
<?php
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define('RSS2', 1, true);
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define('JSON', 2, true);
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define('JSONP', 3, true);
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/**
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* Univarsel Feed Writer class
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*
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* Genarate RSS2 or JSON (original: RSS 1.0, RSS2.0 and ATOM Feed)
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*
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* Modified for FiveFilters.org's Full-Text RSS project
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* to allow for inclusion of hubs, JSON output.
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* Stripped RSS1 and ATOM support.
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*
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* @package UnivarselFeedWriter
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* @author Anis uddin Ahmad <anisniit@gmail.com>
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* @link http://www.ajaxray.com/projects/rss
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*/
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class FeedWriter
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{
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private $self = null; // self URL - http://feed2.w3.org/docs/warning/MissingAtomSelfLink.html
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private $hubs = array(); // PubSubHubbub hubs
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private $channels = array(); // Collection of channel elements
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private $items = array(); // Collection of items as object of FeedItem class.
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private $data = array(); // Store some other version wise data
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private $CDATAEncoding = array(); // The tag names which have to encoded as CDATA
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private $xsl = null; // stylesheet to render RSS (used by Chrome)
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private $json = null; // JSON object
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private $version = null;
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/**
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* Constructor
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*
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* @param constant the version constant (RSS2 or JSON).
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*/
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function __construct($version = RSS2)
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{
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$this->version = $version;
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// Setting default value for assential channel elements
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$this->channels['title'] = $version . ' Feed';
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$this->channels['link'] = 'http://www.ajaxray.com/blog';
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//Tag names to encode in CDATA
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$this->CDATAEncoding = array('description', 'content:encoded', 'content', 'subtitle', 'summary');
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}
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public function setFormat($format) {
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$this->version = $format;
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}
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// Start # public functions ---------------------------------------------
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/**
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* Set a channel element
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* @access public
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* @param srting name of the channel tag
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* @param string content of the channel tag
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* @return void
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*/
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public function setChannelElement($elementName, $content)
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{
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$this->channels[$elementName] = $content ;
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}
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/**
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* Set multiple channel elements from an array. Array elements
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* should be 'channelName' => 'channelContent' format.
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*
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* @access public
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* @param array array of channels
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* @return void
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*/
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public function setChannelElementsFromArray($elementArray)
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{
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if(! is_array($elementArray)) return;
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foreach ($elementArray as $elementName => $content)
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{
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$this->setChannelElement($elementName, $content);
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}
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}
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/**
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* Genarate the actual RSS/JSON file
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*
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* @access public
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* @return void
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*/
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public function genarateFeed()
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{
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if ($this->version == RSS2) {
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header('Content-type: text/xml; charset=UTF-8');
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// this line prevents Chrome 20 from prompting download
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// used by Google: https://news.google.com/news/feeds?ned=us&topic=b&output=rss
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header('X-content-type-options: nosniff');
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} elseif ($this->version == JSON) {
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header('Content-type: application/json; charset=UTF-8');
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$this->json = new stdClass();
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} elseif ($this->version == JSONP) {
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header('Content-type: application/javascript; charset=UTF-8');
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$this->json = new stdClass();
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}
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$this->printHead();
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$this->printChannels();
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$this->printItems();
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$this->printTale();
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if ($this->version == JSON || $this->version == JSONP) {
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echo json_encode($this->json);
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}
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}
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/**
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* Create a new FeedItem.
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*
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* @access public
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* @return object instance of FeedItem class
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*/
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public function createNewItem()
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{
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$Item = new FeedItem($this->version);
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return $Item;
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}
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/**
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* Add a FeedItem to the main class
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*
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* @access public
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* @param object instance of FeedItem class
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* @return void
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*/
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public function addItem($feedItem)
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{
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$this->items[] = $feedItem;
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}
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// Wrapper functions -------------------------------------------------------------------
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/**
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* Set the 'title' channel element
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*
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* @access public
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* @param srting value of 'title' channel tag
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* @return void
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*/
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public function setTitle($title)
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{
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$this->setChannelElement('title', $title);
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}
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/**
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* Add a hub to the channel element
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*
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* @access public
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* @param string URL
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* @return void
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*/
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public function addHub($hub)
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{
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$this->hubs[] = $hub;
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}
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/**
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* Set XSL URL
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*
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* @access public
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* @param string URL
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* @return void
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*/
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public function setXsl($xsl)
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{
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$this->xsl = $xsl;
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}
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/**
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* Set self URL
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*
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* @access public
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* @param string URL
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* @return void
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*/
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public function setSelf($self)
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{
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$this->self = $self;
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}
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/**
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* Set the 'description' channel element
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*
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* @access public
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* @param srting value of 'description' channel tag
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* @return void
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*/
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public function setDescription($desciption)
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{
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$tag = ($this->version == ATOM)? 'subtitle' : 'description';
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$this->setChannelElement($tag, $desciption);
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}
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/**
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* Set the 'link' channel element
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*
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* @access public
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* @param srting value of 'link' channel tag
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* @return void
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*/
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public function setLink($link)
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{
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$this->setChannelElement('link', $link);
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}
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/**
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* Set the 'image' channel element
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*
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* @access public
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* @param srting title of image
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* @param srting link url of the imahe
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* @param srting path url of the image
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* @return void
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*/
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public function setImage($title, $link, $url)
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{
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$this->setChannelElement('image', array('title'=>$title, 'link'=>$link, 'url'=>$url));
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}
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// End # public functions ----------------------------------------------
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// Start # private functions ----------------------------------------------
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/**
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* Prints the xml and rss namespace
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*
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* @access private
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* @return void
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*/
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private function printHead()
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{
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if ($this->version == RSS2)
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{
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$out = '<?xml version="1.0" encoding="utf-8"?>'."\n";
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if ($this->xsl) $out .= '<?xml-stylesheet type="text/xsl" href="'.htmlspecialchars($this->xsl).'"?>' . PHP_EOL;
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$out .= '<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:media="http://search.yahoo.com/mrss/">' . PHP_EOL;
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echo $out;
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}
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elseif ($this->version == JSON || $this->version == JSONP)
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{
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$this->json->rss = array('@attributes' => array('version' => '2.0'));
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}
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}
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/**
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* Closes the open tags at the end of file
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*
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* @access private
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* @return void
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*/
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private function printTale()
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{
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if ($this->version == RSS2)
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{
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echo '</channel>',PHP_EOL,'</rss>';
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}
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// do nothing for JSON
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}
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/**
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* Creates a single node as xml format
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*
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* @access private
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* @param string name of the tag
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* @param mixed tag value as string or array of nested tags in 'tagName' => 'tagValue' format
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* @param array Attributes(if any) in 'attrName' => 'attrValue' format
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* @return string formatted xml tag
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*/
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private function makeNode($tagName, $tagContent, $attributes = null)
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{
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if ($this->version == RSS2)
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{
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$nodeText = '';
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$attrText = '';
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if (is_array($attributes))
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{
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foreach ($attributes as $key => $value)
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{
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$attrText .= " $key=\"$value\" ";
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}
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}
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$nodeText .= "<{$tagName}{$attrText}>";
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if (is_array($tagContent))
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{
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foreach ($tagContent as $key => $value)
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{
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$nodeText .= $this->makeNode($key, $value);
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}
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}
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else
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{
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//$nodeText .= (in_array($tagName, $this->CDATAEncoding))? $tagContent : htmlentities($tagContent);
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$nodeText .= htmlspecialchars($tagContent);
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}
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//$nodeText .= (in_array($tagName, $this->CDATAEncoding))? "]]></$tagName>" : "</$tagName>";
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$nodeText .= "</$tagName>";
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return $nodeText . PHP_EOL;
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}
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elseif ($this->version == JSON || $this->version == JSONP)
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{
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$tagName = (string)$tagName;
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$tagName = strtr($tagName, ':', '_');
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$node = null;
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if (!$tagContent && is_array($attributes) && count($attributes))
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{
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$node = array('@attributes' => $this->json_keys($attributes));
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} else {
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if (is_array($tagContent)) {
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$node = $this->json_keys($tagContent);
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} else {
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$node = $tagContent;
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}
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}
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return $node;
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}
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return ''; // should not get here
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}
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private function json_keys(array $array) {
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$new = array();
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foreach ($array as $key => $val) {
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if (is_string($key)) $key = strtr($key, ':', '_');
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if (is_array($val)) {
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$new[$key] = $this->json_keys($val);
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} else {
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$new[$key] = $val;
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}
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}
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return $new;
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}
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/**
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* @desc Print channels
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* @access private
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* @return void
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*/
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private function printChannels()
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{
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//Start channel tag
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if ($this->version == RSS2) {
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echo '<channel>' . PHP_EOL;
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// add hubs
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foreach ($this->hubs as $hub) {
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//echo $this->makeNode('link', '', array('rel'=>'hub', 'href'=>$hub, 'xmlns'=>'http://www.w3.org/2005/Atom'));
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echo '<link rel="hub" href="'.htmlspecialchars($hub).'" xmlns="http://www.w3.org/2005/Atom" />' . PHP_EOL;
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}
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// add self
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if (isset($this->self)) {
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//echo $this->makeNode('link', '', array('rel'=>'self', 'href'=>$this->self, 'xmlns'=>'http://www.w3.org/2005/Atom'));
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echo '<link rel="self" href="'.htmlspecialchars($this->self).'" xmlns="http://www.w3.org/2005/Atom" />' . PHP_EOL;
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}
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//Print Items of channel
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foreach ($this->channels as $key => $value)
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{
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echo $this->makeNode($key, $value);
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}
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} elseif ($this->version == JSON || $this->version == JSONP) {
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$this->json->rss['channel'] = (object)$this->json_keys($this->channels);
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}
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}
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/**
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* Prints formatted feed items
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*
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* @access private
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* @return void
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*/
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private function printItems()
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{
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foreach ($this->items as $item) {
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$itemElements = $item->getElements();
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echo $this->startItem();
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if ($this->version == JSON || $this->version == JSONP) {
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$json_item = array();
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}
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foreach ($itemElements as $thisElement) {
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foreach ($thisElement as $instance) {
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if ($this->version == RSS2) {
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echo $this->makeNode($instance['name'], $instance['content'], $instance['attributes']);
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} elseif ($this->version == JSON || $this->version == JSONP) {
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$_json_node = $this->makeNode($instance['name'], $instance['content'], $instance['attributes']);
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if (count($thisElement) > 1) {
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$json_item[strtr($instance['name'], ':', '_')][] = $_json_node;
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} else {
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$json_item[strtr($instance['name'], ':', '_')] = $_json_node;
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}
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}
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}
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}
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echo $this->endItem();
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if ($this->version == JSON || $this->version == JSONP) {
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if (count($this->items) > 1) {
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$this->json->rss['channel']->item[] = $json_item;
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} else {
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$this->json->rss['channel']->item = $json_item;
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}
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}
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}
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}
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/**
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* Make the starting tag of channels
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*
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* @access private
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* @return void
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*/
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private function startItem()
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{
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if ($this->version == RSS2)
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{
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echo '<item>' . PHP_EOL;
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}
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// nothing for JSON
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}
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/**
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* Closes feed item tag
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*
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* @access private
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* @return void
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*/
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private function endItem()
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{
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if ($this->version == RSS2)
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{
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echo '</item>' . PHP_EOL;
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}
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// nothing for JSON
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}
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// End # private functions ----------------------------------------------
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}
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