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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 MIME_TYPE = 'application/atom+xml';
protected const ATOM_NS = 'http://www.w3.org/2005/Atom';
protected const MRSS_NS = 'http://search.yahoo.com/mrss/';
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 = $urlPrefix . $urlHost . $urlRequest;
$extraInfos = $this->getExtraInfos();
$uri = !empty($extraInfos['uri']) ? $extraInfos['uri'] : REPOSITORY;
$document = new DomDocument('1.0', $this->getCharset());
$document->formatOutput = true;
$feed = $document->createElementNS(self::ATOM_NS, 'feed');
$document->appendChild($feed);
$feed->setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:media', self::MRSS_NS);
$title = $document->createElement('title');
$feed->appendChild($title);
$title->setAttribute('type', 'text');
$title->appendChild($document->createTextNode($extraInfos['name']));
$id = $document->createElement('id');
$feed->appendChild($id);
$id->appendChild($document->createTextNode($feedUrl));
$uriparts = parse_url($uri);
if (!empty($extraInfos['icon'])) {
$iconUrl = $extraInfos['icon'];
} else {
$iconUrl = $uriparts['scheme'] . '://' . $uriparts['host'] . '/favicon.ico';
}
$icon = $document->createElement('icon');
$feed->appendChild($icon);
$icon->appendChild($document->createTextNode($iconUrl));
$logo = $document->createElement('logo');
$feed->appendChild($logo);
$logo->appendChild($document->createTextNode($iconUrl));
$feedTimestamp = gmdate(DATE_ATOM, $this->lastModified);
$updated = $document->createElement('updated');
$feed->appendChild($updated);
$updated->appendChild($document->createTextNode($feedTimestamp));
// since we can't guarantee that all items have an author,
// a global feed author is mandatory
$feedAuthor = 'RSS-Bridge';
$author = $document->createElement('author');
$feed->appendChild($author);
$authorName = $document->createElement('name');
$author->appendChild($authorName);
$authorName->appendChild($document->createTextNode($feedAuthor));
$linkAlternate = $document->createElement('link');
$feed->appendChild($linkAlternate);
$linkAlternate->setAttribute('rel', 'alternate');
$linkAlternate->setAttribute('type', 'text/html');
$linkAlternate->setAttribute('href', $uri);
$linkSelf = $document->createElement('link');
$feed->appendChild($linkSelf);
$linkSelf->setAttribute('rel', 'self');
$linkSelf->setAttribute('type', 'application/atom+xml');
$linkSelf->setAttribute('href', $feedUrl);
foreach ($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 = $entryUri;
}
if (empty($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 = ' ';
}
$entry = $document->createElement('entry');
$feed->appendChild($entry);
$title = $document->createElement('title');
$entry->appendChild($title);
$title->setAttribute('type', 'html');
$title->appendChild($document->createTextNode($entryTitle));
$entryTimestamp = gmdate(DATE_ATOM, $entryTimestamp);
$published = $document->createElement('published');
$entry->appendChild($published);
$published->appendChild($document->createTextNode($entryTimestamp));
$updated = $document->createElement('updated');
$entry->appendChild($updated);
$updated->appendChild($document->createTextNode($entryTimestamp));
$id = $document->createElement('id');
$entry->appendChild($id);
$id->appendChild($document->createTextNode($entryID));
if (!empty($entryUri)) {
$entryLinkAlternate = $document->createElement('link');
$entry->appendChild($entryLinkAlternate);
$entryLinkAlternate->setAttribute('rel', 'alternate');
$entryLinkAlternate->setAttribute('type', 'text/html');
$entryLinkAlternate->setAttribute('href', $entryUri);
}
if (!empty($item->getAuthor())) {
$author = $document->createElement('author');
$entry->appendChild($author);
$authorName = $document->createElement('name');
$author->appendChild($authorName);
$authorName->appendChild($document->createTextNode($item->getAuthor()));
}
$content = $document->createElement('content');
$content->setAttribute('type', 'html');
$content->appendChild($document->createTextNode($this->sanitizeHtml($entryContent)));
$entry->appendChild($content);
foreach ($item->getEnclosures() as $enclosure) {
$entryEnclosure = $document->createElement('link');
$entry->appendChild($entryEnclosure);
$entryEnclosure->setAttribute('rel', 'enclosure');
$entryEnclosure->setAttribute('type', getMimeType($enclosure));
$entryEnclosure->setAttribute('href', $enclosure);
}
foreach ($item->getCategories() as $category) {
$entryCategory = $document->createElement('category');
$entry->appendChild($entryCategory);
$entryCategory->setAttribute('term', $category);
}
if (!empty($item->thumbnail)) {
$thumbnail = $document->createElementNS(self::MRSS_NS, 'thumbnail');
$entry->appendChild($thumbnail);
$thumbnail->setAttribute('url', $item->thumbnail);
}
}
$toReturn = $document->saveXML();
// Remove invalid characters
ini_set('mbstring.substitute_character', 'none');
$toReturn = mb_convert_encoding($toReturn, $this->getCharset(), 'UTF-8');
return $toReturn;
}
}
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