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<?php
namespace Zelenin;
use DateTime;
use DOMDocument;
use DOMElement;
use Exception;
class Feed extends DOMDocument
{
const VERSION = '2.1.1';
/** @var DomElement $rss */
private $rss;
/** @var DomElement $channel */
private $channel;
private $title;
/** @var DomElement $item */
private $item;
public function __construct()
{
parent::__construct();
$this->formatOutput = true;
$this->encoding = 'utf-8';
$rssElement = $this->createElement('rss');
$rssElement->setAttribute('version', '2.0');
$rssElement->setAttribute('xmlns:atom', 'http://www.w3.org/2005/Atom');
$this->rss = $this->appendChild($rssElement);
}
public function addChannel($href = null)
{
$channelElement = $this->createElement('channel');
$this->channel = $this->rss->appendChild($channelElement);
$this->addChannelElement('atom:link', '', [
'href' => $href
? $href
: $_SERVER['REQUEST_SCHEME'] . '://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'],
'rel' => 'self',
'type' => 'application/rss+xml'
]);
$this->addChannelGenerator();
$this->addChannelDocs();
return $this;
}
public function addChannelElement($element, $value, $attr = array())
{
$element = $this->createElement($element, $this->normalizeString($value));
foreach ($attr as $key => $value) {
$element->setAttribute($key, $this->normalizeString($value));
}
$this->channel->appendChild($element);
return $this;
}
public function addChannelElementWithSub($element, $sub)
{
$element = $this->createElement($element);
foreach ($sub as $key => $value) {
$subElement = $this->createElement($key, $this->normalizeString($value));
$element->appendChild($subElement);
}
$this->channel->appendChild($element);
return $this;
}
public function addChannelElementWithIdentSub($element, $child, $sub)
{
$element = $this->createElement($element);
foreach ($sub as $value) {
$subElement = $this->createElement($child, $this->normalizeString($value));
$element->appendChild($subElement);
}
$this->channel->appendChild($element);
return $this;
}
public function addChannelTitle($value)
{
$this->title = $value;
return $this->addChannelElement('title', $this->title);
}
public function addChannelLink($value)
{
return $this->addChannelElement('link', $value);
}
public function addChannelDescription($value)
{
return $this->addChannelElement('description', $value);
}
public function addChannelLanguage($value)
{
return $this->addChannelElement('language', $value);
}
public function addChannelCopyright($value)
{
return $this->addChannelElement('copyright', $value);
}
public function addChannelManagingEditor($value)
{
return $this->addChannelElement('managingEditor', $value);
}
public function addChannelWebMaster($value)
{
return $this->addChannelElement('webMaster', $value);
}
public function addChannelPubDate($value)
{
return $this->addChannelElement('pubDate', $this->normalizeDateTime($value));
}
public function addChannelLastBuildDate($value)
{
return $this->addChannelElement('lastBuildDate', $this->normalizeDateTime($value));
}
public function addChannelCategory($value, $domain = null)
{
return $domain
? $this->addChannelElement('category', $value, ['domain' => $domain])
: $this->addChannelElement('category', $value);
}
public function addChannelGenerator()
{
return $this->addChannelElement('generator', 'RSS Generator ' . static::VERSION);
}
public function addChannelDocs()
{
return $this->addChannelElement('docs', 'http://www.rssboard.org/rss-specification');
}
public function addChannelCloud($domain, $port, $path, $registerProcedure, $protocol)
{
return $this->addChannelElement('cloud', '', [
'domain' => $domain,
'port' => $port,
'path' => $path,
'registerProcedure' => $registerProcedure,
'protocol' => $protocol
]);
}
public function addChannelTtl($value)
{
return $this->addChannelElement('ttl', $value);
}
public function addChannelImage($url, $link, $width = 88, $height = 31, $description)
{
if ($width < 1 || $width > 400) {
throw new Exception('Width of the image must be in the range of 1 to 400 pixels. Current value is ' . $width);
}
if ($height < 1 || $height > 144) {
throw new Exception('Height of the image must be in the range of 1 to 144 pixels. Current value is ' . $height);
}
return $this->addChannelElementWithSub('image', [
'url' => $url,
'title' => $this->title,
'link' => $link,
'width' => $width,
'height' => $height,
'description' => $description
]);
}
public function addChannelRating($value)
{
return $this->addChannelElement('rating', $value);
}
public function addChannelTextInput($title, $description, $name, $link)
{
return $this->addChannelElementWithSub('textInput', [
'title' => $title,
'description' => $description,
'name' => $name,
'link' => $link
]);
}
public function addChannelSkipHours($value)
{
return $this->addChannelElementWithIdentSub('skipHours', 'hour', $value);
}
public function addChannelSkipDays($value)
{
return $this->addChannelElementWithIdentSub('skipDays', 'day', $value);
}
public function addItem()
{
$item = $this->createElement('item');
$this->item = $this->channel->appendChild($item);
return $this;
}
public function addItemElement($element, $value, $attr = array())
{
$element = $this->createElement($element, $this->normalizeString($value));
foreach ($attr as $key => $value) {
$element->setAttribute($key, $this->normalizeString($value));
}
$this->item->appendChild($element);
return $this;
}
public function addItemTitle($value)
{
return $this->addItemElement('title', $value);
}
public function addItemLink($value)
{
return $this->addItemElement('link', $value);
}
public function addItemDescription($value)
{
return $this->addItemElement('description', $value);
}
public function addItemAuthor($value)
{
return $this->addItemElement('author', $value);
}
public function addItemCategory($value, $domain = null)
{
return $domain
? $this->addItemElement('category', $value, ['domain' => $domain])
: $this->addItemElement('category', $value);
}
public function addItemComments($value)
{
return $this->addItemElement('comments', $value);
}
public function addItemEnclosure($url, $length, $type)
{
return $this->addItemElement('enclosure', '', [
'url' => $url,
'length' => $length,
'type' => $type
]);
}
public function addItemGuid($value, $isPermaLink = true)
{
return $this->addItemElement('guid', $value, ['isPermaLink' => $isPermaLink === false ? 'false' : 'true']);
}
public function addItemPubDate($value)
{
return $this->addItemElement('pubDate', $this->normalizeDateTime($value));
}
public function addItemSource($value, $url)
{
return $this->addItemElement('source', $value, ['url' => $url]);
}
public function __toString()
{
header('Content-Type: application/rss+xml; charset=utf-8');
return $this->saveXML();
}
private function normalizeDateTime($value)
{
if ($value instanceof DateTime) {
$datetime = $value;
} else {
if (is_numeric($value)) {
$datetime = new DateTime();
$datetime->setTimestamp($value);
} else {
try {
$datetime = new DateTime($value);
} catch (Exception $e) {
echo $e->getMessage();
exit(1);
}
}
}
return $datetime->format(DATE_RSS);
}
private function normalizeString($string)
{
$string = html_entity_decode($string, ENT_HTML5, $this->encoding);
$string = htmlspecialchars($string, ENT_QUOTES, $this->encoding, false);
return $string;
}
}