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374 lines
11 KiB
374 lines
11 KiB
<?php
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namespace FeedWriter;
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use \DateTime;
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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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/**
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* Universal Feed Writer
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*
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* Item class - Used as feed element in Feed class
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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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class Item
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{
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/**
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* Collection of feed item elements
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*/
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private $elements = 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;
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/**
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* Is used as a suffix when multiple elements have the same name.
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**/
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private $_cpt = 0;
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/**
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* Constructor
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*
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* @param constant (RSS1/RSS2/ATOM) RSS2 is default.
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*/
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public function __construct($version = Feed::RSS2)
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{
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$this->version = $version;
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}
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/**
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* Return an unique number
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*
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* @access private
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* @return int
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**/
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private function cpt()
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{
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return $this->_cpt++;
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}
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/**
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* Add an element to elements array
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*
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* @access public
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* @param string The tag name of an element
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* @param string The content of tag
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* @param array Attributes (if any) in 'attrName' => 'attrValue' format
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* @param boolean Specifies if an already existing element is overwritten.
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* @param boolean Specifies if multiple elements of the same name are allowed.
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* @return self
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*/
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public function addElement($elementName, $content, $attributes = null, $overwrite = FALSE, $allowMultiple = FALSE)
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{
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$key = $elementName;
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// return if element already exists & if overwriting is disabled
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// & if multiple elements are not allowed.
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if (isset($this->elements[$elementName]) && !$overwrite) {
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if (!$allowMultiple)
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return;
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$key .= '-' . $this->cpt();
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}
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$this->elements[$key]['name'] = $elementName;
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$this->elements[$key]['content'] = $content;
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$this->elements[$key]['attributes'] = $attributes;
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return $this;
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}
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/**
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* Set multiple feed elements from an array.
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* Elements which have attributes cannot be added by this method
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*
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* @access public
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* @param array array of elements in 'tagName' => 'tagContent' format.
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* @return self
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*/
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public function addElementArray($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 => $content) {
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$this->addElement($elementName, $content);
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}
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return $this;
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}
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/**
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* Return the collection of elements in this feed item
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*
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* @access public
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* @return array All elements of this item.
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*/
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public function getElements()
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{
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return $this->elements;
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}
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/**
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* Return the type of this feed item
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*
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* @access public
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* @return string The feed type, as defined in Feed.php
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*/
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public function getVersion()
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{
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return $this->version;
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}
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// Wrapper functions ------------------------------------------------------
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/**
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* Set the 'description' element of feed item
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*
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* @access public
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* @param string The content of 'description' or 'summary' element
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* @return self
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*/
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public function setDescription($description)
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{
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$tag = ($this->version == Feed::ATOM) ? 'summary' : 'description';
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return $this->addElement($tag, $description);
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}
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/**
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* Set the 'content' element of the feed item
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* For ATOM feeds only
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*
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* @access public
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* @param string Content for the item (i.e., the body of a blog post).
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* @return self
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*/
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public function setContent($content)
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{
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if ($this->version != Feed::ATOM)
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die('The content element is supported in ATOM feeds only.');
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return $this->addElement('content', $content, array('type' => 'html'));
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}
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/**
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* Set the 'title' element of feed item
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*
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* @access public
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* @param string The content of 'title' element
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* @return self
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*/
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public function setTitle($title)
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{
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return $this->addElement('title', $title);
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}
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/**
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* Set the 'date' element of the feed item.
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*
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* The value of the date parameter can be either an instance of the
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* DateTime class, an integer containing a UNIX timestamp or a string
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* which is parseable by PHP's 'strtotime' function.
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*
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* @access public
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* @param DateTime|int|string Date which should be used.
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* @return self
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*/
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public function setDate($date)
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{
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if (!is_numeric($date)) {
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if ($date instanceof DateTime)
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$date = $date->getTimestamp();
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else {
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$date = strtotime($date);
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if ($date === FALSE)
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die('The given date string was not parseable.');
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}
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} elseif ($date < 0)
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die('The given date is not an UNIX timestamp.');
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if ($this->version == Feed::ATOM) {
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$tag = 'updated';
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$value = date(\DATE_ATOM, $date);
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} elseif ($this->version == Feed::RSS2) {
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$tag = 'pubDate';
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$value = date(\DATE_RSS, $date);
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} else {
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$tag = 'dc:date';
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$value = date("Y-m-d", $date);
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}
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return $this->addElement($tag, $value);
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}
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/**
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* Set the 'link' element of feed item
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*
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* @access public
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* @param string The content of 'link' element
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* @return void
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*/
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public function setLink($link)
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{
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if ($this->version == Feed::RSS2 || $this->version == Feed::RSS1) {
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$this->addElement('link', $link);
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} else {
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$this->addElement('link','',array('href'=>$link));
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$this->addElement('id', Feed::uuid($link,'urn:uuid:'));
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}
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return $this;
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}
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/**
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* Attach a external media to the feed item.
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* Not supported in RSS 1.0 feeds.
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*
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* See RFC 4288 for syntactical correct MIME types.
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*
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* Note that you should avoid the use of more than one enclosure in one item,
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* since some RSS aggregators don't support it.
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*
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* @access public
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* @param string The URL of the media.
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* @param integer The length of the media.
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* @param string The MIME type attribute of the media.
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* @param boolean Specifies, if multiple enclosures are allowed
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* @return self
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* @link https://tools.ietf.org/html/rfc4288
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*/
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public function addEnclosure($url, $length, $type, $multiple = TRUE)
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{
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if ($this->version == Feed::RSS1)
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die('Media attachment is not supported in RSS1 feeds.');
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// the length parameter should be set to 0 if it can't be determined
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// see http://www.rssboard.org/rss-profile#element-channel-item-enclosure
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if (!is_numeric($length) || $length < 0)
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die('The length parameter must be an integer and greater or equals to zero.');
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// Regex used from RFC 4287, page 41
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if (!is_string($type) || preg_match('/.+\/.+/', $type) != 1)
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die('type parameter must be a string and a MIME type.');
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$attributes = array('length' => $length, 'type' => $type);
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if ($this->version == Feed::RSS2) {
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$attributes['url'] = $url;
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$this->addElement('enclosure', '', $attributes, FALSE, $multiple);
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} else {
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$attributes['href'] = $url;
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$attributes['rel'] = 'enclosure';
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$this->addElement('atom:link', '', $attributes, FALSE, $multiple);
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}
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return $this;
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}
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/**
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* Alias of addEnclosure, for backward compatibility. Using only this
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* method ensures that the 'enclosure' element will be present only once.
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*
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* @access public
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* @param string The URL of the media.
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* @param integer The length of the media.
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* @param string The MIME type attribute of the media.
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* @return self
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* @link https://tools.ietf.org/html/rfc4288
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* @deprecated Use the addEnclosure method instead.
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*
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**/
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public function setEnclosure($url, $length, $type)
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{
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return $this->addEnclosure($url, $length, $type, false);
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}
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/**
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* Set the 'author' element of feed item.
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* Not supported in RSS 1.0 feeds.
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*
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* @access public
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* @param string The author of this item
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* @param string Optional email address of the author
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* @param string Optional URI related to the author
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* @return self
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*/
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public function setAuthor($author, $email = null, $uri = null)
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{
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switch ($this->version) {
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case Feed::RSS1: die('The author element is not supported in RSS1 feeds.');
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break;
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case Feed::RSS2:
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if ($email != null)
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$author = $email . ' (' . $author . ')';
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$this->addElement('author', $author);
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break;
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case Feed::ATOM:
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$elements = array('name' => $author);
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// Regex from RFC 4287 page 41
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if ($email != null && preg_match('/.+@.+/', $email) == 1)
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$elements['email'] = $email;
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if ($uri != null)
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$elements['uri'] = $uri;
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$this->addElement('author', $elements);
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break;
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}
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return $this;
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}
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/**
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* Set the unique identifier of the feed item
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*
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* @access public
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* @param string The unique identifier of this item
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* @param boolean The value of the 'isPermaLink' attribute in RSS 2 feeds.
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* @return self
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*/
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public function setId($id, $permaLink = false)
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{
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if ($this->version == Feed::RSS2) {
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if (!is_bool($permaLink))
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die('The permaLink parameter must be boolean.');
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$permaLink = $permaLink ? 'true' : 'false';
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$this->addElement('guid', $id, array('isPermaLink' => $permaLink));
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} elseif ($this->version == Feed::ATOM) {
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$this->addElement('id', Feed::uuid($id,'urn:uuid:'), NULL, TRUE);
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} else
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die('A unique ID is not supported in RSS1 feeds.');
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return $this;
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}
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} // end of class Item
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