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<?php
namespace FeedWriter;
use \DateTime;
/*
* Copyright (C) 2008 Anis uddin Ahmad <anisniit@gmail.com>
* Copyright (C) 2010-2013, 2015-2016 Michael Bemmerl <mail@mx-server.de>
*
* This file is part of the "Universal Feed Writer" project.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Universal Feed Writer
*
* Item class - Used as feed element in Feed class
*
* @package UniversalFeedWriter
* @author Anis uddin Ahmad <anisniit@gmail.com>
* @link http://www.ajaxray.com/projects/rss
*/
class Item
{
/**
* Collection of feed item elements
*/
private $elements = array();
/**
* Contains the format of this feed.
*/
private $version;
/**
* Is used as a suffix when multiple elements have the same name.
**/
private $_cpt = 0;
/**
* Constructor
*
* @param string $version constant (RSS1/RSS2/ATOM) RSS2 is default.
*/
public function __construct($version = Feed::RSS2)
{
$this->version = $version;
}
/**
* Return an unique number
*
* @access private
* @return int
**/
private function cpt()
{
return $this->_cpt++;
}
/**
* Add an element to elements array
*
* @access public
* @param string $elementName The tag name of an element
* @param string $content The content of tag
* @param array $attributes Attributes (if any) in 'attrName' => 'attrValue' format
* @param boolean $overwrite Specifies if an already existing element is overwritten.
* @param boolean $allowMultiple Specifies if multiple elements of the same name are allowed.
* @return self
* @throws \InvalidArgumentException if the element name is not a string, empty or NULL.
*/
public function addElement($elementName, $content, array $attributes = null, $overwrite = FALSE, $allowMultiple = FALSE)
{
if (empty($elementName))
throw new \InvalidArgumentException('The element name may not be empty or NULL.');
if (!is_string($elementName))
throw new \InvalidArgumentException('The element name must be a string.');
$key = $elementName;
// return if element already exists & if overwriting is disabled
// & if multiple elements are not allowed.
if (isset($this->elements[$elementName]) && !$overwrite) {
if (!$allowMultiple)
return $this;
$key .= '-' . $this->cpt();
}
$this->elements[$key]['name'] = $elementName;
$this->elements[$key]['content'] = $content;
$this->elements[$key]['attributes'] = $attributes;
return $this;
}
/**
* Set multiple feed elements from an array.
* Elements which have attributes cannot be added by this method
*
* @access public
* @param array array of elements in 'tagName' => 'tagContent' format.
* @return self
*/
public function addElementArray(array $elementArray)
{
foreach ($elementArray as $elementName => $content) {
$this->addElement($elementName, $content);
}
return $this;
}
/**
* Return the collection of elements in this feed item
*
* @access public
* @return array All elements of this item.
* @throws InvalidOperationException on ATOM feeds if either a content or link element is missing.
* @throws InvalidOperationException on RSS1 feeds if a title or link element is missing.
*/
public function getElements()
{
// ATOM feeds have some specific requirements...
if ($this->version == Feed::ATOM)
{
// Add an 'id' element, if it was not added by calling the setLink method.
// Use the value of the title element as key, since no link element was specified.
if (!array_key_exists('id', $this->elements))
$this->setId(Feed::uuid($this->elements['title']['content'], 'urn:uuid:'));
// Either a 'link' or 'content' element is needed.
if (!array_key_exists('content', $this->elements) && !array_key_exists('link', $this->elements))
throw new InvalidOperationException('ATOM feed entries need a link or a content element. Call the setLink or setContent method.');
}
// ...same with RSS1 feeds.
else if ($this->version == Feed::RSS1)
{
if (!array_key_exists('title', $this->elements))
throw new InvalidOperationException('RSS1 feed entries need a title element. Call the setTitle method.');
if (!array_key_exists('link', $this->elements))
throw new InvalidOperationException('RSS1 feed entries need a link element. Call the setLink method.');
}
return $this->elements;
}
/**
* Return the type of this feed item
*
* @access public
* @return string The feed type, as defined in Feed.php
*/
public function getVersion()
{
return $this->version;
}
// Wrapper functions ------------------------------------------------------
/**
* Set the 'description' element of feed item
*
* @access public
* @param string $description The content of the 'description' or 'summary' element
* @return self
*/
public function setDescription($description)
{
$tag = ($this->version == Feed::ATOM) ? 'summary' : 'description';
return $this->addElement($tag, $description);
}
/**
* Set the 'content' element of the feed item
* For ATOM feeds only
*
* @access public
* @param string $content Content for the item (i.e., the body of a download post).
* @return self
* @throws InvalidOperationException if this method is called on non-ATOM feeds.
*/
public function setContent($content)
{
if ($this->version != Feed::ATOM)
throw new InvalidOperationException('The content element is supported in ATOM feeds only.');
return $this->addElement('content', $content, array('type' => 'html'));
}
/**
* Set the 'title' element of feed item
*
* @access public
* @param string $title The content of 'title' element
* @return self
*/
public function setTitle($title)
{
return $this->addElement('title', $title);
}
/**
* Set the 'date' element of the feed item.
*
* The value of the date parameter can be either an instance of the
* DateTime class, an integer containing a UNIX timestamp or a string
* which is parseable by PHP's 'strtotime' function.
*
* @access public
* @param DateTime|int|string $date Date which should be used.
* @return self
* @throws \InvalidArgumentException if the given date was not parseable.
*/
public function setDate($date)
{
if (!is_numeric($date)) {
if ($date instanceof DateTime)
$date = $date->getTimestamp();
else {
$date = strtotime($date);
if ($date === FALSE)
throw new \InvalidArgumentException('The given date string was not parseable.');
}
} elseif ($date < 0)
throw new \InvalidArgumentException('The given date is not an UNIX timestamp.');
if ($this->version == Feed::ATOM) {
$tag = 'updated';
$value = date(\DATE_ATOM, $date);
} elseif ($this->version == Feed::RSS2) {
$tag = 'pubDate';
$value = date(\DATE_RSS, $date);
} else {
$tag = 'dc:date';
$value = date("Y-m-d", $date);
}
return $this->addElement($tag, $value);
}
/**
* Set the 'link' element of feed item
*
* @access public
* @param string $link The content of 'link' element
* @return self
*/
public function setLink($link)
{
if ($this->version == Feed::RSS2 || $this->version == Feed::RSS1) {
$this->addElement('link', $link);
} else {
$this->addElement('link','',array('href'=>$link));
$this->setId(Feed::uuid($link,'urn:uuid:'));
}
return $this;
}
/**
* Attach a external media to the feed item.
* Not supported in RSS 1.0 feeds.
*
* See RFC 4288 for syntactical correct MIME types.
*
* Note that you should avoid the use of more than one enclosure in one item,
* since some RSS aggregators don't support it.
*
* @access public
* @param string $url The URL of the media.
* @param integer $length The length of the media.
* @param string $type The MIME type attribute of the media.
* @param boolean $multiple Specifies if multiple enclosures are allowed
* @return self
* @link https://tools.ietf.org/html/rfc4288
* @throws \InvalidArgumentException if the length or type parameter is invalid.
* @throws InvalidOperationException if this method is called on RSS1 feeds.
*/
public function addEnclosure($url, $length, $type, $multiple = TRUE)
{
if ($this->version == Feed::RSS1)
throw new InvalidOperationException('Media attachment is not supported in RSS1 feeds.');
// the length parameter should be set to 0 if it can't be determined
// see http://www.rssboard.org/rss-profile#element-channel-item-enclosure
if (!is_numeric($length) || $length < 0)
throw new \InvalidArgumentException('The length parameter must be an integer and greater or equals to zero.');
// Regex used from RFC 4287, page 41
if (!is_string($type) || preg_match('/.+\/.+/', $type) != 1)
throw new \InvalidArgumentException('type parameter must be a string and a MIME type.');
$attributes = array('length' => $length, 'type' => $type);
if ($this->version == Feed::RSS2) {
$attributes['url'] = $url;
$this->addElement('enclosure', '', $attributes, FALSE, $multiple);
} else {
$attributes['href'] = $url;
$attributes['rel'] = 'enclosure';
$this->addElement('atom:link', '', $attributes, FALSE, $multiple);
}
return $this;
}
/**
* Set the 'author' element of feed item.
* Not supported in RSS 1.0 feeds.
*
* @access public
* @param string $author The author of this item
* @param string|null $email Optional email address of the author
* @param string|null $uri Optional URI related to the author
* @return self
* @throws \InvalidArgumentException if the provided email address is syntactically incorrect.
* @throws InvalidOperationException if this method is called on RSS1 feeds.
*/
public function setAuthor($author, $email = null, $uri = null)
{
if ($this->version == Feed::RSS1)
throw new InvalidOperationException('The author element is not supported in RSS1 feeds.');
// Regex from RFC 4287 page 41
if ($email != null && preg_match('/.+@.+/', $email) != 1)
throw new \InvalidArgumentException('The email address is syntactically incorrect.');
if ($this->version == Feed::RSS2)
{
if ($email != null)
$author = $email . ' (' . $author . ')';
$this->addElement('author', $author);
}
else
{
$elements = array('name' => $author);
if ($email != null)
$elements['email'] = $email;
if ($uri != null)
$elements['uri'] = $uri;
$this->addElement('author', $elements);
}
return $this;
}
/**
* Set the unique identifier of the feed item
*
* On ATOM feeds, the identifier must begin with an valid URI scheme.
*
* @access public
* @param string $id The unique identifier of this item
* @param boolean $permaLink The value of the 'isPermaLink' attribute in RSS 2 feeds.
* @return self
* @throws \InvalidArgumentException if the permaLink parameter is not boolean.
* @throws InvalidOperationException if this method is called on RSS1 feeds.
*/
public function setId($id, $permaLink = false)
{
if ($this->version == Feed::RSS2) {
if (!is_bool($permaLink))
throw new \InvalidArgumentException('The permaLink parameter must be boolean.');
$permaLink = $permaLink ? 'true' : 'false';
$this->addElement('guid', $id, array('isPermaLink' => $permaLink));
} elseif ($this->version == Feed::ATOM) {
// Check if the given ID is an valid URI scheme (see RFC 4287 4.2.6)
// The list of valid schemes was generated from http://www.iana.org/assignments/uri-schemes
// by using only permanent or historical schemes.
$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');
$found = FALSE;
$checkId = strtolower($id);
foreach($validSchemes as $scheme)
if (strrpos($checkId, $scheme . ':', -strlen($checkId)) !== FALSE)
{
$found = TRUE;
break;
}
if (!$found)
throw new \InvalidArgumentException("The ID must begin with an IANA-registered URI scheme.");
$this->addElement('id', $id, NULL, TRUE);
} else
throw new InvalidOperationException('A unique ID is not supported in RSS1 feeds.');
return $this;
}
} // end of class Item