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<?php
namespace PicoFeed\Syndication;
use DomDocument;
use DomElement;
use DomAttr;
/**
* Atom writer class
*
* @author Frederic Guillot
* @package Syndication
*/
class Atom extends Writer
{
/**
* List of required properties for each feed
*
* @access private
* @var array
*/
private $required_feed_properties = array(
'title',
'site_url',
'feed_url',
);
/**
* List of required properties for each item
*
* @access private
* @var array
*/
private $required_item_properties = array(
'title',
'url',
);
/**
* Get the Atom document
*
* @access public
* @param string $filename Optional filename
* @return string
*/
public function execute($filename = '')
{
$this->checkRequiredProperties($this->required_feed_properties, $this);
$this->dom = new DomDocument('1.0', 'UTF-8');
$this->dom->formatOutput = true;
// <feed/>
$feed = $this->dom->createElement('feed');
$feed->setAttributeNodeNS(new DomAttr('xmlns', 'http://www.w3.org/2005/Atom'));
// <generator/>
$generator = $this->dom->createElement('generator', 'PicoFeed');
$generator->setAttribute('uri', 'https://github.com/fguillot/picoFeed');
$feed->appendChild($generator);
// <title/>
$title = $this->dom->createElement('title');
$title->appendChild($this->dom->createTextNode($this->title));
$feed->appendChild($title);
// <id/>
$id = $this->dom->createElement('id');
$id->appendChild($this->dom->createTextNode($this->site_url));
$feed->appendChild($id);
// <updated/>
$this->addUpdated($feed, $this->updated);
// <link rel="alternate" type="text/html" href="http://example.org/"/>
$this->addLink($feed, $this->site_url);
// <link rel="self" type="application/atom+xml" href="http://example.org/feed.atom"/>
$this->addLink($feed, $this->feed_url, 'self', 'application/atom+xml');
// <author/>
if (isset($this->author)) $this->addAuthor($feed, $this->author);
// <entry/>
foreach ($this->items as $item) {
$this->checkRequiredProperties($this->required_item_properties, $item);
$feed->appendChild($this->createEntry($item));
}
$this->dom->appendChild($feed);
if ($filename) {
$this->dom->save($filename);
}
else {
return $this->dom->saveXML();
}
}
/**
* Create item entry
*
* @access public
* @param arrray $item Item properties
* @return DomElement
*/
public function createEntry(array $item)
{
$entry = $this->dom->createElement('entry');
// <title/>
$title = $this->dom->createElement('title');
$title->appendChild($this->dom->createTextNode($item['title']));
$entry->appendChild($title);
// <id/>
$id = $this->dom->createElement('id');
$id->appendChild($this->dom->createTextNode(isset($item['id']) ? $item['id'] : $item['url']));
$entry->appendChild($id);
// <updated/>
$this->addUpdated($entry, isset($item['updated']) ? $item['updated'] : '');
// <published/>
if (isset($item['published'])) {
$entry->appendChild($this->dom->createElement('published', date(DATE_ATOM, $item['published'])));
}
// <link rel="alternate" type="text/html" href="http://example.org/"/>
$this->addLink($entry, $item['url']);
// <summary/>
if (isset($item['summary'])) {
$summary = $this->dom->createElement('summary');
$summary->appendChild($this->dom->createTextNode($item['summary']));
$entry->appendChild($summary);
}
// <content/>
if (isset($item['content'])) {
$content = $this->dom->createElement('content');
$content->setAttribute('type', 'html');
$content->appendChild($this->dom->createCDATASection($item['content']));
$entry->appendChild($content);
}
// <author/>
if (isset($item['author'])) {
$this->addAuthor($entry, $item['author']);
}
return $entry;
}
/**
* Add Link
*
* @access public
* @param DomElement $xml XML node
* @param string $url URL
* @param string $rel Link rel attribute
* @param string $type Link type attribute
*/
public function addLink(DomElement $xml, $url, $rel = 'alternate', $type = 'text/html')
{
$link = $this->dom->createElement('link');
$link->setAttribute('rel', $rel);
$link->setAttribute('type', $type);
$link->setAttribute('href', $url);
$xml->appendChild($link);
}
/**
* Add publication date
*
* @access public
* @param DomElement $xml XML node
* @param integer $value Timestamp
*/
public function addUpdated(DomElement $xml, $value = 0)
{
$xml->appendChild($this->dom->createElement(
'updated',
date(DATE_ATOM, $value ?: time())
));
}
/**
* Add author
*
* @access public
* @param DomElement $xml XML node
* @param array $values Author name and email
*/
public function addAuthor(DomElement $xml, array $values)
{
$author = $this->dom->createElement('author');
if (isset($values['name'])) {
$name = $this->dom->createElement('name');
$name->appendChild($this->dom->createTextNode($values['name']));
$author->appendChild($name);
}
if (isset($values['email'])) {
$email = $this->dom->createElement('email');
$email->appendChild($this->dom->createTextNode($values['email']));
$author->appendChild($email);
}
if (isset($values['url'])) {
$uri = $this->dom->createElement('uri');
$uri->appendChild($this->dom->createTextNode($values['url']));
$author->appendChild($uri);
}
$xml->appendChild($author);
}
}
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