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856 lines
22 KiB
856 lines
22 KiB
<?php
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namespace FeedWriter\View;
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use \DateTime;
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use \FeedWriter\Item;
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/*
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* Copyright (C) 2008 Anis uddin Ahmad <anisniit@gmail.com>
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* Copyright (C) 2010-2013 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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/**
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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 SyndicationBase
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{
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const RSS1 = 'RSS 1.0';
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const RSS2 = 'RSS 2.0';
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const ATOM = 'ATOM';
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/**
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* Collection of all channel elements
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*/
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private $channels = array();
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/**
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* Collection of items as object of \FeedWriter\Item class.
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*/
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private $items = array();
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/**
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* Store some other version wise data
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*/
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private $data = array();
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/**
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* The tag names which have to encoded as CDATA
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*/
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private $CDATAEncoding = array();
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/**
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* Collection of XML namespaces
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*/
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private $namespaces = array();
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/**
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* Contains the format of this feed.
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*/
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private $version = null;
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/**
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* Constructor
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*
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* If no version is given, a feed in RSS 2.0 format will be generated.
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*
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* @param constant the version constant (RSS1/RSS2/ATOM).
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*/
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protected function __construct($version = self::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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// Add some default XML namespaces
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$this->namespaces['content'] = 'http://purl.org/rss/1.0/modules/content/';
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$this->namespaces['wfw'] = 'http://wellformedweb.org/CommentAPI/';
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$this->namespaces['atom'] = 'http://www.w3.org/2005/Atom';
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$this->namespaces['rdf'] = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#';
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$this->namespaces['rss1'] = 'http://purl.org/rss/1.0/';
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$this->namespaces['dc'] = 'http://purl.org/dc/elements/1.1/';
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$this->namespaces['sy'] = 'http://purl.org/rss/1.0/modules/syndication/';
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//Tag names to encode in CDATA
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$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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* Adds a channel element indicating the program used to generate the feed.
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*
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* @return void
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*/
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public function addGenerator()
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{
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if ($this->version == static::ATOM)
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$this->setChannelElement('atom:generator', 'FeedWriter', array('uri' => 'https://github.com/mibe/FeedWriter'));
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else if ($this->version == static::RSS2)
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$this->setChannelElement('generator', 'FeedWriter');
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else
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throw new Exception('The generator element is not supported in RSS1 feeds.');
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return $this;
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}
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/**
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* Add a XML namespace to the internal list of namespaces. After that,
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* custom channel elements can be used properly to generate a valid feed.
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*
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* @access public
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* @param string namespace prefix
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* @param string namespace name (URI)
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* @return void
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* @link http://www.w3.org/TR/REC-xml-names/
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*/
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public function addNamespace($prefix, $uri)
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{
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$this->namespaces[$prefix] = $uri;
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return $this;
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}
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/**
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* Add a channel element to the feed.
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*
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* @access public
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* @param string name of the channel tag
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* @param string content of the channel tag
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* @param bool TRUE if this element can appear multiple times
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* @return void
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*/
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public function setChannelElement($elementName, $content, $multiple = false)
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{
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if ($multiple === TRUE)
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$this->channels[$elementName][] = $content;
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else
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$this->channels[$elementName] = $content;
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return $this;
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}
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/**
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* Set multiple channel elements from an array. Array elements
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* should be 'channelName' => 'channelContent' format.
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*
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* @access public
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* @param array array of channels
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* @return void
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*/
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public function setChannelElementsFromArray($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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return $this;
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}
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/**
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* Get the appropriate MIME type string for the current feed.
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*
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* @access public
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* @return string
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*/
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public function getMIMEType()
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{
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switch($this->version)
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{
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case static::RSS2 : $mimeType = "application/rss+xml";
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break;
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case static::RSS1 : $mimeType = "application/rdf+xml";
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break;
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case static::ATOM : $mimeType = "application/atom+xml";
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break;
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default : $mimeType = "text/xml";
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}
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return $mimeType;
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}
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/**
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* Print the actual RSS/ATOM file
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*
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* Sets a Content-Type header and echoes the contents of the feed.
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* Should only be used in situations where direct output is desired;
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* if you need to pass a string around, use generateFeed() instead.
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*
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* @access public
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* @param bool FALSE if the specific feed media type should be sent.
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* @return void
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*/
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public function printFeed($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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$contentType = $this->getMIMEType();
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}
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header("Content-Type: " . $contentType);
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echo $this->generateFeed();
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}
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/**
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* Generate the feed.
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*
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* @access public
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* @return string
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*/
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public function generateFeed()
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{
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return $this->makeHeader()
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. $this->makeChannels()
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. $this->makeItems()
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. $this->makeFooter();
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}
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/**
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* Create a new Item.
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*
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* @access public
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* @return object instance of Item class
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*/
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public function createNewItem()
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{
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$Item = new Item($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 Item instance of Item class
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* @return void
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*/
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public function addItem(Item $feedItem)
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{
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if ($feedItem->getVersion() != $this->version)
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throw new Exception('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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return $this;
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}
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// Wrapper functions -------------------------------------------------------------------
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/**
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* Set the 'title' channel element
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*
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* @access public
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* @param string value of 'title' channel tag
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* @return void
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*/
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public function setTitle($title)
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{
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return $this->setChannelElement('title', $title);
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}
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/**
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* Set the date when the ATOM feed was lastly updated.
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*
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* This adds the 'updated' element to the feed. The value of the date parameter
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* can be either an instance of the DateTime class, an integer containing a UNIX
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* timestamp or a string which is parseable by PHP's 'strtotime' function.
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*
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* Not supported in RSS1 feeds.
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*
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* @access public
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* @param DateTime|int|string Date which should be used.
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* @return void
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*/
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public function setDate($date)
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{
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if ($this->version == static::RSS1)
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throw new Exception('The publication date is not supported in RSS1 feeds.');
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// The feeds have different date formats.
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$format = $this->version == static::ATOM ? \DATE_ATOM : \DATE_RSS;
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if ($date instanceof DateTime)
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$date = $date->format($format);
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else if(is_numeric($date) && $date >= 0)
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$date = date($format, $date);
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else if (is_string($date))
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$date = date($format, strtotime($date));
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else
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throw new Exception('The given date was not an instance of DateTime, a UNIX timestamp or a date string.');
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if ($this->version == static::ATOM)
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$this->setChannelElement('updated', $date);
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else
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$this->setChannelElement('lastBuildDate', $date);
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return $this;
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}
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/**
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* Set the 'description' channel element
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*
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* @access public
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* @param string value of 'description' channel tag
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* @return void
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*/
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public function setDescription($description)
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{
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if ($this->version != static::ATOM)
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$this->setChannelElement('description', $description);
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return $this;
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}
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/**
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* Set the 'link' channel element
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*
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* @access public
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* @param string value of 'link' channel tag
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* @return void
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*/
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public function setLink($link)
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{
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return $this->setChannelElement('link', $link);
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}
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/**
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* Set custom 'link' channel elements.
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*
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* In ATOM feeds, only one link with alternate relation and the same combination of
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* type and hreflang values.
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*
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* @access public
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* @param string URI of this link
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* @param string relation type of the resource
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* @param string media type of the target resource
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* @param string language of the resource
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* @param string human-readable information about the resource
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* @param int length of the resource in bytes
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* @link https://www.iana.org/assignments/link-relations/link-relations.xml
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* @link https://tools.ietf.org/html/rfc4287#section-4.1.1
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*/
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public function setAtomLink($href, $rel = null, $type = null, $hreflang = null, $title = null, $length = null)
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{
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$data = array('href' => $href);
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if ($rel != null)
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{
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if (!is_string($rel) || empty($rel))
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throw new Exception('rel parameter must be a string and a valid relation identifier.');
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$data['rel'] = $rel;
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}
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if ($type != null)
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{
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// Regex used from RFC 4287, page 41
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if (!is_string($type) || preg_match('/.+\/.+/', $type) != 1)
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throw new Exception('type parameter must be a string and a MIME type.');
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$data['type'] = $type;
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}
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if ($hreflang != null)
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{
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// Regex used from RFC 4287, page 41
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if (!is_string($hreflang) || preg_match('/[A-Za-z]{1,8}(-[A-Za-z0-9]{1,8})*/', $hreflang) != 1)
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throw new Exception('hreflang parameter must be a string and a valid language code.');
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$data['hreflang'] = $hreflang;
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}
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if ($title != null)
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{
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if (!is_string($title) || empty($title))
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throw new Exception('title parameter must be a string and not empty.');
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$data['title'] = $title;
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}
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if ($length != null)
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{
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if (!is_int($length) || $length < 0)
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throw new Exception('length parameter must be a positive integer.');
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$data['length'] = (string)$length;
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}
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// ATOM spec. has some restrictions on atom:link usage
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// See RFC 4287, page 12 (4.1.1)
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if ($this->version == static::ATOM)
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{
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foreach($this->channels as $key => $value)
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{
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if ($key != 'atom:link')
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continue;
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// $value is an array , so check every element
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foreach($value as $linkItem)
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{
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// Only one link with relation alternate and same hreflang & type is allowed.
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if (@$linkItem['rel'] == 'alternate' && @$linkItem['hreflang'] == $hreflang && @$linkItem['type'] == $type)
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throw new Exception('The feed must not contain more than one link element with a relation of "alternate"'
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. ' that has the same combination of type and hreflang attribute values.');
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}
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}
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}
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return $this->setChannelElement('atom:link', $data, true);
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}
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/**
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* Set an 'atom:link' channel element with relation=self attribute.
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* Needs the full URL to this feed.
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*
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* @link http://www.rssboard.org/rss-profile#namespace-elements-atom-link
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* @access public
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* @param string URL to this feed
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* @return void
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*/
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public function setSelfLink($url)
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{
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return $this->setAtomLink($url, 'self', $this->getMIMEType());
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}
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/**
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* Set the 'image' channel element
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*
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* @access public
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* @param string title of image
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* @param string link url of the image
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* @param string path url of the image
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* @return void
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*/
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public function setImage($title, $link, $url)
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{
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return $this->setChannelElement('image', array('title'=>$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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return $this;
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}
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/**
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* Generate an UUID.
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*
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* The UUID is based on an MD5 hash. If no key is given, a unique ID as the input
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* for the MD5 hash is generated.
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*
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* @author Anis uddin Ahmad <admin@ajaxray.com>
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* @param string optional key on which the UUID is generated
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* @param string an optional prefix
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* @return string the formated UUID
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*/
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public static function uuid($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 . $uuid;
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}
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// End # public functions ----------------------------------------------
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// Start # private functions ----------------------------------------------
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/**
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* Returns all used XML namespace prefixes in this instance.
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* This includes all channel elements and feed items.
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* Unfortunately some namespace prefixes are not included,
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* because they are hardcoded, e.g. rdf.
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*
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* @access private
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* @return array Array with namespace prefix as value.
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*/
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private function getNamespacePrefixes()
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{
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$prefixes = array();
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// Get all tag names from channel elements...
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$tags = array_keys($this->channels);
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// ... and now all names from feed items
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foreach ($this->items as $item)
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$tags = array_merge($tags, array_keys($item->getElements()));
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// Look for prefixes in those tag names
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foreach($tags as $tag)
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{
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$elements = explode(':', $tag);
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if (count($elements) != 2)
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continue;
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$prefixes[] = $elements[0];
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}
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return array_unique($prefixes);
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}
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/**
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* Returns the XML header and root element, depending on the feed type.
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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 makeHeader()
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{
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$out = '<?xml version="1.0" encoding="utf-8"?>' . PHP_EOL;
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$prefixes = $this->getNamespacePrefixes();
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$attributes = array();
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$tagName = '';
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$defaultNamespace = '';
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if($this->version == static::RSS2)
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{
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$tagName = 'rss';
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$attributes['version'] = '2.0';
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}
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elseif($this->version == static::RSS1)
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{
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$tagName = 'rdf:RDF';
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$prefixes[] = 'rdf';
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$defaultNamespace = $this->namespaces['rss1'];
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}
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else if($this->version == static::ATOM)
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{
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$tagName = 'feed';
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$defaultNamespace = $this->namespaces['atom'];
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|
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// Ugly hack to remove the 'atom' value from the prefixes array.
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$prefixes = array_flip($prefixes);
|
|
unset($prefixes['atom']);
|
|
$prefixes = array_flip($prefixes);
|
|
}
|
|
|
|
// Iterate through every namespace prefix and add it to the element attributes.
|
|
foreach($prefixes as $prefix)
|
|
{
|
|
if (!isset($this->namespaces[$prefix]))
|
|
throw new Exception('Unknown XML namespace prefix: \'' . $prefix . '\'. Use the addNamespace method to add support for this prefix.');
|
|
else
|
|
$attributes['xmlns:' . $prefix] = $this->namespaces[$prefix];
|
|
}
|
|
|
|
// Include default namepsace, if required
|
|
if (!empty($defaultNamespace))
|
|
$attributes['xmlns'] = $defaultNamespace;
|
|
|
|
$out .= $this->makeNode($tagName, '', $attributes, true);
|
|
|
|
return $out;
|
|
}
|
|
|
|
/**
|
|
* Closes the open tags at the end of file
|
|
*
|
|
* @access private
|
|
* @return void
|
|
*/
|
|
private function makeFooter()
|
|
{
|
|
if($this->version == static::RSS2)
|
|
{
|
|
return '</channel>' . PHP_EOL . '</rss>';
|
|
}
|
|
elseif($this->version == static::RSS1)
|
|
{
|
|
return '</rdf:RDF>';
|
|
}
|
|
else if($this->version == static::ATOM)
|
|
{
|
|
return '</feed>';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Creates a single node in XML format
|
|
*
|
|
* @access private
|
|
* @param string name of the tag
|
|
* @param mixed tag value as string or array of nested tags in 'tagName' => 'tagValue' format
|
|
* @param array Attributes (if any) in 'attrName' => 'attrValue' format
|
|
* @param string True if the end tag should be omitted. Defaults to false.
|
|
* @return string formatted xml tag
|
|
*/
|
|
private function makeNode($tagName, $tagContent, $attributes = null, $omitEndTag = false)
|
|
{
|
|
$nodeText = '';
|
|
$attrText = '';
|
|
|
|
if(is_array($attributes) && count($attributes) > 0)
|
|
{
|
|
foreach ($attributes as $key => $value)
|
|
{
|
|
$value = htmlspecialchars($value);
|
|
$attrText .= " $key=\"$value\"";
|
|
}
|
|
}
|
|
|
|
if(is_array($tagContent) && $this->version == static::RSS1)
|
|
{
|
|
$attrText = ' rdf:parseType="Resource"';
|
|
}
|
|
|
|
$attrText .= (in_array($tagName, $this->CDATAEncoding) && $this->version == static::ATOM) ? ' type="html"' : '';
|
|
$nodeText .= "<{$tagName}{$attrText}>";
|
|
$nodeText .= (in_array($tagName, $this->CDATAEncoding)) ? '<![CDATA[' : '';
|
|
|
|
if(is_array($tagContent))
|
|
{
|
|
foreach ($tagContent as $key => $value)
|
|
{
|
|
$nodeText .= $this->makeNode($key, $value);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
$nodeText .= (in_array($tagName, $this->CDATAEncoding)) ? $this->sanitizeCDATA($tagContent) : htmlspecialchars($tagContent);
|
|
}
|
|
|
|
$nodeText .= (in_array($tagName, $this->CDATAEncoding)) ? ']]>' : '';
|
|
|
|
if (!$omitEndTag)
|
|
$nodeText .= "</$tagName>";
|
|
|
|
$nodeText .= PHP_EOL;
|
|
|
|
return $nodeText;
|
|
}
|
|
|
|
/**
|
|
* Make the channels.
|
|
*
|
|
* @access private
|
|
* @return void
|
|
*/
|
|
private function makeChannels()
|
|
{
|
|
$out = '';
|
|
|
|
//Start channel tag
|
|
switch ($this->version)
|
|
{
|
|
case static::RSS2:
|
|
$out .= '<channel>' . PHP_EOL;
|
|
break;
|
|
case static::RSS1:
|
|
$out .= (isset($this->data['ChannelAbout']))? "<channel rdf:about=\"{$this->data['ChannelAbout']}\">" : "<channel rdf:about=\"{$this->channels['link']}\">";
|
|
break;
|
|
}
|
|
|
|
//Print Items of channel
|
|
foreach ($this->channels as $key => $value)
|
|
{
|
|
// ATOM feed needs some special handling
|
|
if ($this->version == static::ATOM)
|
|
{
|
|
// Strip all ATOM namespace prefixes from tags. Not needed here, because the ATOM namespace name is
|
|
// used as default namespace.
|
|
if (strncmp($key, 'atom', 4) == 0)
|
|
$key = substr($key, 5);
|
|
|
|
if ($key == 'link')
|
|
{
|
|
if (is_array($value))
|
|
{
|
|
// $value is an array containing multiple atom:link element attributes
|
|
foreach($value as $attributes)
|
|
{
|
|
// $attributes contains actually the node attributes, not the value.
|
|
$out .= $this->makeNode($key, '', $attributes);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// ATOM prints link element as href attribute
|
|
$out .= $this->makeNode($key, '', array('href' => $value));
|
|
//Add the id for ATOM
|
|
$out .= $this->makeNode('id', static::uuid($value, 'urn:uuid:'));
|
|
}
|
|
}
|
|
else
|
|
$out .= $this->makeNode($key, $value);
|
|
}
|
|
else
|
|
{
|
|
if ($key == 'atom:link')
|
|
{
|
|
// $value is an array containing multiple atom:link element attributes
|
|
foreach($value as $attributes)
|
|
{
|
|
// $attributes contains actually the node attributes, not the value.
|
|
$out .= $this->makeNode($key, '', $attributes);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
$out .= $this->makeNode($key, $value);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
//RSS 1.0 have special tag <rdf:Seq> with channel
|
|
if($this->version == static::RSS1)
|
|
{
|
|
$out .= "<items>" . PHP_EOL . "<rdf:Seq>" . PHP_EOL;
|
|
foreach ($this->items as $item)
|
|
{
|
|
$thisItems = $item->getElements();
|
|
$out .= "<rdf:li resource=\"{$thisItems['link']['content']}\"/>" . PHP_EOL;
|
|
}
|
|
$out .= "</rdf:Seq>" . PHP_EOL . "</items>" . PHP_EOL . "</channel>" . PHP_EOL;
|
|
}
|
|
|
|
return $out;
|
|
}
|
|
|
|
/**
|
|
* Prints formatted feed items
|
|
*
|
|
* @access private
|
|
* @return void
|
|
*/
|
|
private function makeItems()
|
|
{
|
|
$out = '';
|
|
|
|
foreach ($this->items as $item)
|
|
{
|
|
$thisItems = $item->getElements();
|
|
|
|
// the argument is printed as rdf:about attribute of item in rss 1.0
|
|
$out .= $this->startItem($thisItems['link']['content']);
|
|
|
|
foreach ($thisItems as $feedItem)
|
|
{
|
|
$name = $feedItem['name'];
|
|
|
|
// Strip all ATOM namespace prefixes from tags when feed is an ATOM feed.
|
|
// Not needed here, because the ATOM namespace name is used as default namespace.
|
|
if ($this->version == static::ATOM && strncmp($name, 'atom', 4) == 0)
|
|
$name = substr($name, 5);
|
|
|
|
$out .= $this->makeNode($name, $feedItem['content'], $feedItem['attributes']);
|
|
}
|
|
$out .= $this->endItem();
|
|
}
|
|
|
|
return $out;
|
|
}
|
|
|
|
/**
|
|
* Make the starting tag of channels
|
|
*
|
|
* @access private
|
|
* @param string The vale of about tag which is used for RSS 1.0 only.
|
|
* @return void
|
|
*/
|
|
private function startItem($about = false)
|
|
{
|
|
$out = '';
|
|
|
|
if($this->version == static::RSS2)
|
|
{
|
|
$out .= '<item>' . PHP_EOL;
|
|
}
|
|
else if($this->version == static::RSS1)
|
|
{
|
|
if($about)
|
|
{
|
|
$out .= "<item rdf:about=\"$about\">" . PHP_EOL;
|
|
}
|
|
else
|
|
{
|
|
throw new Exception("link element is not set - It's required for RSS 1.0 to be used as the about attribute of the item tag.");
|
|
}
|
|
}
|
|
else if($this->version == static::ATOM)
|
|
{
|
|
$out .= "<entry>" . PHP_EOL;
|
|
}
|
|
|
|
return $out;
|
|
}
|
|
|
|
/**
|
|
* Closes feed item tag
|
|
*
|
|
* @access private
|
|
* @return void
|
|
*/
|
|
private function endItem()
|
|
{
|
|
if($this->version == static::RSS2 || $this->version == static::RSS1)
|
|
{
|
|
return '</item>' . PHP_EOL;
|
|
}
|
|
else if($this->version == static::ATOM)
|
|
{
|
|
return '</entry>' . PHP_EOL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sanitizes data which will be later on returned as CDATA in the feed.
|
|
*
|
|
* A "]]>" respectively "<![CDATA" in the data would break the CDATA in the
|
|
* XML, so the brackets are converted to a HTML entity.
|
|
*
|
|
* @access private
|
|
* @param string Data to be sanitized
|
|
* @return string Sanitized data
|
|
*/
|
|
private function sanitizeCDATA($text)
|
|
{
|
|
$text = str_replace("]]>", "]]>", $text);
|
|
$text = str_replace("<![CDATA[", "<![CDATA[", $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
// End # private functions ----------------------------------------------
|
|
|
|
} // end of class Feed
|