forked from ZwiiCMS-Team/ZwiiCampus
414 lines
15 KiB
PHP
414 lines
15 KiB
PHP
<?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, 2015-2016 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 string $version constant (RSS1/RSS2/ATOM) RSS2 is default.
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*/
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public function __construct($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 $elementName The tag name of an element
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* @param string $content The content of tag
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* @param array $attributes Attributes (if any) in 'attrName' => 'attrValue' format
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* @param boolean $overwrite Specifies if an already existing element is overwritten.
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* @param boolean $allowMultiple Specifies if multiple elements of the same name are allowed.
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* @return self
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* @throws \InvalidArgumentException if the element name is not a string, empty or NULL.
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*/
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public function addElement($elementName, $content, array $attributes = null, $overwrite = FALSE, $allowMultiple = FALSE)
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{
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if (empty($elementName))
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throw new \InvalidArgumentException('The element name may not be empty or NULL.');
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if (!is_string($elementName))
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throw new \InvalidArgumentException('The element name must be a string.');
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$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 $this;
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$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(array $elementArray)
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{
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foreach ($elementArray as $elementName => $content) {
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$this->addElement($elementName, $content);
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}
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return $this;
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}
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/**
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* Return the collection of elements in this feed item
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*
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* @access public
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* @return array All elements of this item.
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* @throws InvalidOperationException on ATOM feeds if either a content or link element is missing.
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* @throws InvalidOperationException on RSS1 feeds if a title or link element is missing.
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*/
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public function getElements()
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{
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// ATOM feeds have some specific requirements...
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if ($this->version == Feed::ATOM)
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{
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// Add an 'id' element, if it was not added by calling the setLink method.
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// Use the value of the title element as key, since no link element was specified.
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if (!array_key_exists('id', $this->elements))
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$this->setId(Feed::uuid($this->elements['title']['content'], 'urn:uuid:'));
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// Either a 'link' or 'content' element is needed.
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if (!array_key_exists('content', $this->elements) && !array_key_exists('link', $this->elements))
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throw new InvalidOperationException('ATOM feed entries need a link or a content element. Call the setLink or setContent method.');
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}
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// ...same with RSS1 feeds.
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else if ($this->version == Feed::RSS1)
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{
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if (!array_key_exists('title', $this->elements))
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throw new InvalidOperationException('RSS1 feed entries need a title element. Call the setTitle method.');
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if (!array_key_exists('link', $this->elements))
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throw new InvalidOperationException('RSS1 feed entries need a link element. Call the setLink method.');
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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 $description The content of the 'description' or 'summary' element
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* @return self
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*/
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public function setDescription($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 $content Content for the item (i.e., the body of a blog post).
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* @return self
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* @throws InvalidOperationException if this method is called on non-ATOM feeds.
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*/
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public function setContent($content)
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{
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if ($this->version != Feed::ATOM)
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throw new InvalidOperationException('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 $title The content of 'title' element
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* @return self
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*/
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public function setTitle($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 $date Date which should be used.
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* @return self
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* @throws \InvalidArgumentException if the given date was not parseable.
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*/
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public function setDate($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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throw new \InvalidArgumentException('The given date string was not parseable.');
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}
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} elseif ($date < 0)
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throw new \InvalidArgumentException('The given date is not an UNIX timestamp.');
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if ($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 $link The content of 'link' element
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* @return self
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*/
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public function setLink($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->setId(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 $url The URL of the media.
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* @param integer $length The length of the media.
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* @param string $type The MIME type attribute of the media.
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* @param boolean $multiple Specifies if multiple enclosures are allowed
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* @return self
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* @link https://tools.ietf.org/html/rfc4288
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* @throws \InvalidArgumentException if the length or type parameter is invalid.
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* @throws InvalidOperationException if this method is called on RSS1 feeds.
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*/
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public function addEnclosure($url, $length, $type, $multiple = TRUE)
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{
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if ($this->version == Feed::RSS1)
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throw new InvalidOperationException('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) || $length < 0)
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throw new \InvalidArgumentException('The length parameter must be an integer and greater or equals to zero.');
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// Regex used from RFC 4287, page 41
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if (!is_string($type) || preg_match('/.+\/.+/', $type) != 1)
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throw new \InvalidArgumentException('type parameter must be a string and a MIME type.');
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$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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* 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 $author The author of this item
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* @param string|null $email Optional email address of the author
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* @param string|null $uri Optional URI related to the author
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* @return self
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* @throws \InvalidArgumentException if the provided email address is syntactically incorrect.
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* @throws InvalidOperationException if this method is called on RSS1 feeds.
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*/
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public function setAuthor($author, $email = null, $uri = null)
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{
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if ($this->version == Feed::RSS1)
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throw new InvalidOperationException('The author element is not supported in RSS1 feeds.');
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// Regex from RFC 4287 page 41
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if ($email != null && preg_match('/.+@.+/', $email) != 1)
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throw new \InvalidArgumentException('The email address is syntactically incorrect.');
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if ($this->version == Feed::RSS2)
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{
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if ($email != null)
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$author = $email . ' (' . $author . ')';
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$this->addElement('author', $author);
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}
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else
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{
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$elements = array('name' => $author);
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if ($email != null)
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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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}
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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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* On ATOM feeds, the identifier must begin with an valid URI scheme.
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*
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* @access public
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* @param string $id The unique identifier of this item
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* @param boolean $permaLink The value of the 'isPermaLink' attribute in RSS 2 feeds.
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* @return self
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* @throws \InvalidArgumentException if the permaLink parameter is not boolean.
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* @throws InvalidOperationException if this method is called on RSS1 feeds.
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*/
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public function setId($id, $permaLink = false)
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{
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if ($this->version == Feed::RSS2) {
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if (!is_bool($permaLink))
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throw new \InvalidArgumentException('The permaLink parameter must be boolean.');
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$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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// Check if the given ID is an valid URI scheme (see RFC 4287 4.2.6)
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// The list of valid schemes was generated from http://www.iana.org/assignments/uri-schemes
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// by using only permanent or historical schemes.
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$validSchemes = array('aaa', 'aaas', 'about', 'acap', 'acct', 'cap', 'cid', 'coap', 'coaps', 'crid', 'data', 'dav', 'dict', 'dns', 'example', 'fax', 'file', 'filesystem', 'ftp', 'geo', 'go', 'gopher', 'h323', 'http', 'https', 'iax', 'icap', 'im', 'imap', 'info', 'ipp', 'ipps', 'iris', 'iris.beep', 'iris.lwz', 'iris.xpc', 'iris.xpcs', 'jabber', 'ldap', 'mailserver', 'mailto', 'mid', 'modem', 'msrp', 'msrps', 'mtqp', 'mupdate', 'news', 'nfs', 'ni', 'nih', 'nntp', 'opaquelocktoken', 'pack', 'pkcs11', 'pop', 'pres', 'prospero', 'reload', 'rtsp', 'rtsps', 'rtspu', 'service', 'session', 'shttp', 'sieve', 'sip', 'sips', 'sms', 'snews', 'snmp', 'soap.beep', 'soap.beeps', 'stun', 'stuns', 'tag', 'tel', 'telnet', 'tftp', 'thismessage', 'tip', 'tn3270', 'turn', 'turns', 'tv', 'urn', 'vemmi', 'videotex', 'vnc', 'wais', 'ws', 'wss', 'xcon', 'xcon-userid', 'xmlrpc.beep', 'xmlrpc.beeps', 'xmpp', 'z39.50', 'z39.50r', 'z39.50s');
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$found = FALSE;
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$checkId = strtolower($id);
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foreach($validSchemes as $scheme)
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if (strrpos($checkId, $scheme . ':', -strlen($checkId)) !== FALSE)
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{
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$found = TRUE;
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break;
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}
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if (!$found)
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throw new \InvalidArgumentException("The ID must begin with an IANA-registered URI scheme.");
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$this->addElement('id', $id, NULL, TRUE);
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} else
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throw new InvalidOperationException('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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