514 lines
12 KiB
PHP
514 lines
12 KiB
PHP
<?php
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/*
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* Copyright (C) 2008 Anis uddin Ahmad <anisniit@gmail.com>
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* Copyright (C) 2010-2012 Michael Bemmerl <mail@mx-server.de>
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*
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* This file is part of the "Universal Feed Writer" project.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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// RSS 0.90 Officially obsoleted by 1.0
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// RSS 0.91, 0.92, 0.93 and 0.94 Officially obsoleted by 2.0
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// So, define constants for RSS 1.0, RSS 2.0 and ATOM
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define('RSS1', 'RSS 1.0', true);
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define('RSS2', 'RSS 2.0', true);
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define('ATOM', 'ATOM', true);
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if (!class_exists('FeedItem'))
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require dirname(__FILE__) . '/FeedItem.php';
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/**
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* Universal Feed Writer class
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*
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* Generate RSS 1.0, RSS2.0 and ATOM Feeds
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*
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* @package UniversalFeedWriter
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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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abstract class FeedWriter
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{
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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 $version = null;
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/**
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* Constructor
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*
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* @param constant the version constant (RSS1/RSS2/ATOM).
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*/
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protected function __construct($version = RSS2)
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{
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$this->version = $version;
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// Setting default value for essential channel elements
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$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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$this->CDATAEncoding = array('description', 'content:encoded', 'summary');
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}
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// Start # public functions ---------------------------------------------
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/**
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* Set a channel element
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* @access public
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* @param string name of the channel tag
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* @param string content of the channel tag
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* @return void
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*/
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public function setChannelElement($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($elementArray))
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return;
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foreach ($elementArray as $elementName => $content)
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{
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$this->setChannelElement($elementName, $content);
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}
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}
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/**
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* Genarate the actual RSS/ATOM file
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*
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* @access public
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* @param bool FALSE if the specific feed media type should be send.
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* @return void
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*/
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public function generateFeed($useGenericContentType = FALSE)
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{
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$contentType = "text/xml";
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if (!$useGenericContentType)
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{
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switch($this->version)
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{
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case RSS2 : $contentType = "application/rss+xml";
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break;
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case RSS1 : $contentType = "application/rdf+xml";
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break;
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case ATOM : $contentType = "application/atom+xml";
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break;
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}
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}
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header("Content-Type: " . $contentType . "; charset=UTF-8");
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$this->printHeader();
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$this->printChannels();
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$this->printItems();
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$this->printFooter();
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}
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/**
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* Create a new FeedItem.
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*
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* @access public
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* @return object instance of FeedItem class
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*/
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public function createNewItem()
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{
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$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 $feedItem)
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{
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if ($feedItem->getVersion() != $this->version)
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die('Feed type mismatch: This instance can handle ' . $this->version . ' feeds only, but item with type ' . $feedItem->getVersion() . ' given.');
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$this->items[] = $feedItem;
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}
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// Wrapper functions -------------------------------------------------------------------
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/**
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* Set the 'title' channel element
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*
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* @access public
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* @param string value of 'title' channel tag
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* @return void
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*/
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public function setTitle($title)
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{
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$this->setChannelElement('title', $title);
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}
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/**
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* Set the 'updated' channel element of an ATOM feed
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*
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* @access public
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* @param string value of 'updated' channel tag
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* @return void
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*/
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public function setDate($date)
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{
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if ($this->version != ATOM)
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return;
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if ($date instanceof DateTime)
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$date = $date->format(DateTime::ATOM);
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else if(is_numeric($date))
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$date = date(DATE_ATOM, $date);
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else
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$date = date(DATE_ATOM, strtotime($date));
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$this->setChannelElement('updated', $date);
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}
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/**
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* Set the 'description' channel element
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*
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* @access public
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* @param string value of 'description' channel tag
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* @return void
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*/
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public function setDescription($desciption)
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{
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if ($this->version != ATOM)
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$this->setChannelElement('description', $desciption);
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}
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/**
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* Set the 'link' channel element
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*
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* @access public
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* @param string value of 'link' channel tag
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* @return void
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*/
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public function setLink($link)
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{
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$this->setChannelElement('link', $link);
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}
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/**
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* Set the 'image' channel element
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*
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* @access public
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* @param string title of image
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* @param string link url of the image
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* @param string path url of the image
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* @return void
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*/
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public function setImage($title, $link, $url)
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{
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$this->setChannelElement('image', array('title'=>$title, 'link'=>$link, 'url'=>$url));
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}
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/**
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* Set the 'about' channel element. Only for RSS 1.0
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*
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* @access public
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* @param string value of 'about' channel tag
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* @return void
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*/
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public function setChannelAbout($url)
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{
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$this->data['ChannelAbout'] = $url;
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}
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/**
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* Generates an UUID
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* @author Anis uddin Ahmad <admin@ajaxray.com>
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* @param string an optional prefix
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* @return string the formated uuid
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*/
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public static function uuid($key = null, $prefix = '')
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{
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$key = ($key == null)? uniqid(rand()) : $key;
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$chars = md5($key);
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$uuid = substr($chars,0,8) . '-';
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$uuid .= substr($chars,8,4) . '-';
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$uuid .= substr($chars,12,4) . '-';
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$uuid .= substr($chars,16,4) . '-';
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$uuid .= substr($chars,20,12);
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return $prefix . $uuid;
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}
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// End # public functions ----------------------------------------------
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// Start # private functions ----------------------------------------------
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/**
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* Prints the xml and rss namespace
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*
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* @access private
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* @return void
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*/
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private function printHeader()
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{
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$out = '<?xml version="1.0" encoding="utf-8"?>' . PHP_EOL;
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if($this->version == RSS2)
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{
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$out .= '<rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:wfw="http://wellformedweb.org/CommentAPI/">';
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}
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elseif($this->version == RSS1)
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{
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$out .= '<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://purl.org/rss/1.0/" xmlns:dc="http://purl.org/dc/elements/1.1/">';
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}
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else if($this->version == ATOM)
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{
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$out .= '<feed xmlns="http://www.w3.org/2005/Atom">';
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}
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$out .= PHP_EOL;
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echo $out;
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}
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/**
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* Closes the open tags at the end of file
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*
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* @access private
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* @return void
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*/
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private function printFooter()
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{
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if($this->version == RSS2)
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{
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echo '</channel>' . PHP_EOL . '</rss>';
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}
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elseif($this->version == RSS1)
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{
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echo '</rdf:RDF>';
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}
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else if($this->version == ATOM)
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{
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echo '</feed>';
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}
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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, $attributes = null)
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{
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$nodeText = '';
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$attrText = '';
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if(is_array($attributes) && count($attributes) > 0)
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{
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foreach ($attributes as $key => $value)
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{
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$value = htmlspecialchars($value);
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$attrText .= " $key=\"$value\" ";
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}
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// Get rid of the last whitespace
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$attrText = substr($attrText, 0, strlen($attrText) - 1);
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}
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if(is_array($tagContent) && $this->version == RSS1)
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{
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$attrText = ' rdf:parseType="Resource"';
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}
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$attrText .= (in_array($tagName, $this->CDATAEncoding) && $this->version == ATOM) ? ' type="html"' : '';
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$nodeText .= "<{$tagName}{$attrText}>";
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$nodeText .= (in_array($tagName, $this->CDATAEncoding)) ? '<![CDATA[' : '';
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if(is_array($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))? $this->sanitizeCDATA($tagContent) : htmlspecialchars($tagContent);
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}
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$nodeText .= (in_array($tagName, $this->CDATAEncoding)) ? ']]>' : '';
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$nodeText .= "</$tagName>" . PHP_EOL;
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return $nodeText;
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}
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/**
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* @desc Print channels
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* @access private
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* @return void
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*/
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private function printChannels()
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{
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//Start channel tag
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switch ($this->version)
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{
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case RSS2:
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echo '<channel>' . PHP_EOL;
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break;
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case RSS1:
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echo (isset($this->data['ChannelAbout']))? "<channel rdf:about=\"{$this->data['ChannelAbout']}\">" : "<channel rdf:about=\"{$this->channels['link']}\">";
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break;
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}
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//Print Items of channel
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foreach ($this->channels as $key => $value)
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{
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if($this->version == ATOM && $key == 'link')
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{
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// ATOM prints link element as href attribute
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echo $this->makeNode($key,'', array('href' => $value));
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//Add the id for ATOM
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echo $this->makeNode('id', FeedWriter::uuid($value, 'urn:uuid:'));
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}
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else
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{
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echo $this->makeNode($key, $value);
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}
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}
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//RSS 1.0 have special tag <rdf:Seq> with channel
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if($this->version == RSS1)
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{
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echo "<items>" . PHP_EOL . "<rdf:Seq>" . PHP_EOL;
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foreach ($this->items as $item)
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{
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$thisItems = $item->getElements();
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echo "<rdf:li resource=\"{$thisItems['link']['content']}\"/>" . PHP_EOL;
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}
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echo "</rdf:Seq>" . PHP_EOL . "</items>" . PHP_EOL . "</channel>" . PHP_EOL;
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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 $item)
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{
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$thisItems = $item->getElements();
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//the argument is printed as rdf:about attribute of item in rss 1.0
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echo $this->startItem($thisItems['link']['content']);
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foreach ($thisItems as $feedItem)
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{
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echo $this->makeNode($feedItem['name'], $feedItem['content'], $feedItem['attributes']);
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}
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echo $this->endItem();
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}
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}
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/**
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* Make the starting tag of channels
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*
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* @access private
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* @param string The vale of about tag which is used for RSS 1.0 only.
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* @return void
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*/
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private function startItem($about = false)
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{
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if($this->version == RSS2)
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{
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echo '<item>' . PHP_EOL;
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}
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else if($this->version == RSS1)
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{
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if($about)
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{
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echo "<item rdf:about=\"$about\">" . PHP_EOL;
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}
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else
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{
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die("link element is not set." . PHP_EOL . "It's required for RSS 1.0 to be used as the about attribute of the item tag.");
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}
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}
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else if($this->version == ATOM)
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{
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echo "<entry>" . PHP_EOL;
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}
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}
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/**
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* Closes feed item tag
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*
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* @access private
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* @return void
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*/
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private function endItem()
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{
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if($this->version == RSS2 || $this->version == RSS1)
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{
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echo '</item>' . PHP_EOL;
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}
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else if($this->version == ATOM)
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{
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echo "</entry>" . PHP_EOL;
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}
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}
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/**
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* Sanitizes data which will be later on returned as CDATA in the feed.
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*
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* A "]]>" respectively "<![CDATA" in the data would break the CDATA in the
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* XML, so the brackets are converted to a HTML entity.
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*
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* @access private
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* @param string Data to be sanitized
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* @return string Sanitized data
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*/
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private function sanitizeCDATA($text)
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{
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$text = str_replace("]]>", "]]>", $text);
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$text = str_replace("<![CDATA[", "<![CDATA[", $text);
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return $text;
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}
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// End # private functions ----------------------------------------------
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} // end of class FeedWriter
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