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<?php
/**
* AtomFormat - RFC 4287: The Atom Syndication Format
* https://tools.ietf.org/html/rfc4287
*
* Validator:
* https://validator.w3.org/feed/
*/
class AtomFormat extends FormatAbstract{
const LIMIT_TITLE = 140;
public function stringify(){
$urlPrefix = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? 'https://' : 'http://';
$urlHost = (isset($_SERVER['HTTP_HOST'])) ? $_SERVER['HTTP_HOST'] : '';
$urlPath = (isset($_SERVER['PATH_INFO'])) ? $_SERVER['PATH_INFO'] : '';
$urlRequest = (isset($_SERVER['REQUEST_URI'])) ? $_SERVER['REQUEST_URI'] : '';
$feedUrl = $this->xml_encode($urlPrefix . $urlHost . $urlRequest);
$extraInfos = $this->getExtraInfos();
$title = $this->xml_encode($extraInfos['name']);
$uri = !empty($extraInfos['uri']) ? $extraInfos['uri'] : REPOSITORY;
// since we can't guarantee that all items have an author,
// a global feed author is mandatory
$feedAuthor = 'RSS-Bridge';
$uriparts = parse_url($uri);
if(!empty($extraInfos['icon'])) {
$icon = $extraInfos['icon'];
} else {
$icon = $this->xml_encode($uriparts['scheme'] . '://' . $uriparts['host'] . '/favicon.ico');
}
$uri = $this->xml_encode($uri);
$entries = '';
foreach($this->getItems() as $item) {
$entryTimestamp = $item->getTimestamp();
$entryTitle = $item->getTitle();
$entryContent = $item->getContent();
$entryUri = $item->getURI();
$entryID = '';
if (!empty($item->getUid()))
$entryID = 'urn:sha1:' . $item->getUid();
if (empty($entryID)) // Fallback to provided URI
$entryID = $this->xml_encode($entryUri);
if (empty($entryID)) // Fallback to title and content
$entryID = 'urn:sha1:' . hash('sha1', $entryTitle . $entryContent);
if (empty($entryTimestamp))
$entryTimestamp = $this->lastModified;
if (empty($entryTitle)) {
$entryTitle = str_replace("\n", ' ', strip_tags($entryContent));
if (strlen($entryTitle) > self::LIMIT_TITLE) {
$wrapPos = strpos(wordwrap($entryTitle, self::LIMIT_TITLE), "\n");
$entryTitle = substr($entryTitle, 0, $wrapPos) . '...';
}
}
if (empty($entryContent))
$entryContent = $entryTitle;
$entryAuthor = $this->xml_encode($item->getAuthor());
$entryTitle = $this->xml_encode($entryTitle);
$entryUri = $this->xml_encode($entryUri);
$entryTimestamp = $this->xml_encode(gmdate(DATE_ATOM, $entryTimestamp));
$entryContent = $this->xml_encode($this->sanitizeHtml($entryContent));
$entryEnclosures = '';
foreach($item->getEnclosures() as $enclosure) {
$entryEnclosures .= '<link rel="enclosure" href="'
. $this->xml_encode($enclosure)
. '" type="' . getMimeType($enclosure) . '" />'
. PHP_EOL;
}
$entryCategories = '';
foreach($item->getCategories() as $category) {
$entryCategories .= '<category term="'
. $this->xml_encode($category)
. '"/>'
. PHP_EOL;
}
$entryLinkAlternate = '';
if (!empty($entryUri)) {
$entryLinkAlternate = '<link rel="alternate" type="text/html" href="'
. $entryUri
. '"/>';
}
if (!empty($entryAuthor)) {
$entryAuthor = '<author><name>'
. $entryAuthor
. '</name></author>';
}
$entries .= <<<EOD
<entry>
<title type="html">{$entryTitle}</title>
<published>{$entryTimestamp}</published>
<updated>{$entryTimestamp}</updated>
<id>{$entryID}</id>
{$entryLinkAlternate}
{$entryAuthor}
<content type="html">{$entryContent}</content>
{$entryEnclosures}
{$entryCategories}
</entry>
EOD;
}
$feedTimestamp = gmdate(DATE_ATOM, $this->lastModified);
$charset = $this->getCharset();
/* Data are prepared, now let's begin the "MAGIE !!!" */
$toReturn = <<<EOD
<?xml version="1.0" encoding="{$charset}"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title type="text">{$title}</title>
<id>{$feedUrl}</id>
<icon>{$icon}</icon>
<logo>{$icon}</logo>
<updated>{$feedTimestamp}</updated>
<author>
<name>{$feedAuthor}</name>
</author>
<link rel="alternate" type="text/html" href="{$uri}" />
<link rel="self" type="application/atom+xml" href="{$feedUrl}" />
{$entries}
</feed>
EOD;
// Remove invalid characters
ini_set('mbstring.substitute_character', 'none');
$toReturn = mb_convert_encoding($toReturn, $this->getCharset(), 'UTF-8');
return $toReturn;
}
public function display(){
$this
->setContentType('application/atom+xml; charset=' . $this->getCharset())
->callContentType();
return parent::display();
}
private function xml_encode($text){
return htmlspecialchars($text, ENT_XML1);
}
}
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