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<?php
class FeedItem_Atom extends FeedItem_Common {
const NS_XML = "http://www.w3.org/XML/1998/namespace";
function get_id(): string {
$id = $this->elem->getElementsByTagName("id")->item(0);
if ($id) {
return $id->nodeValue;
} else {
return clean($this->get_link());
}
}
/**
* @return int|false a timestamp on success, false otherwise
*/
function get_date() {
$updated = $this->elem->getElementsByTagName("updated")->item(0);
if ($updated) {
return strtotime($updated->nodeValue ?? '');
}
$published = $this->elem->getElementsByTagName("published")->item(0);
if ($published) {
return strtotime($published->nodeValue ?? '');
}
$date = $this->xpath->query("dc:date", $this->elem)->item(0);
if ($date) {
return strtotime($date->nodeValue ?? '');
}
// consistent with strtotime failing to parse
return false;
}
function get_link(): string {
$links = $this->elem->getElementsByTagName("link");
foreach ($links as $link) {
/** @phpstan-ignore-next-line */
if ($link->hasAttribute("href") &&
(!$link->hasAttribute("rel")
|| $link->getAttribute("rel") == "alternate"
|| $link->getAttribute("rel") == "standout")) {
$base = $this->xpath->evaluate("string(ancestor-or-self::*[@xml:base][1]/@xml:base)", $link);
if ($base)
return UrlHelper::rewrite_relative($base, clean(trim($link->getAttribute("href"))));
else
return clean(trim($link->getAttribute("href")));
}
}
return '';
}
function get_title(): string {
$title = $this->elem->getElementsByTagName("title")->item(0);
return $title ? clean(trim($title->nodeValue)) : '';
}
/**
* @param string|null $base optional (returns $content if $base is null)
* @param string $content an HTML string
*
* @return string the rewritten XML or original $content
*/
private function rewrite_content_to_base(?string $base = null, ?string $content = '') {
if (!empty($base) && !empty($content)) {
$tmpdoc = new DOMDocument();
if (@$tmpdoc->loadHTML('<?xml encoding="UTF-8">' . $content)) {
$tmpxpath = new DOMXPath($tmpdoc);
$elems = $tmpxpath->query("(//*[@href]|//*[@src])");
foreach ($elems as $elem) {
if ($elem->hasAttribute("href")) {
$elem->setAttribute("href",
UrlHelper::rewrite_relative($base, $elem->getAttribute("href")));
} else if ($elem->hasAttribute("src")) {
$elem->setAttribute("src",
UrlHelper::rewrite_relative($base, $elem->getAttribute("src")));
}
}
// Fall back to $content if saveXML somehow fails (i.e. returns false)
$modified_content = $tmpdoc->saveXML();
return $modified_content !== false ? $modified_content : $content;
}
}
return $content;
}
function get_content(): string {
/** @var DOMElement|null */
$content = $this->elem->getElementsByTagName("content")->item(0);
if ($content) {
$base = $this->xpath->evaluate("string(ancestor-or-self::*[@xml:base][1]/@xml:base)", $content);
if ($content->hasAttribute('type')) {
if ($content->getAttribute('type') == 'xhtml') {
for ($i = 0; $i < $content->childNodes->length; $i++) {
$child = $content->childNodes->item($i);
if ($child->hasChildNodes()) {
return $this->rewrite_content_to_base($base, $this->doc->saveHTML($child));
}
}
}
}
return $this->rewrite_content_to_base($base, $this->subtree_or_text($content));
}
return '';
}
// TODO: duplicate code should be merged with get_content()
function get_description(): string {
/** @var DOMElement|null */
$content = $this->elem->getElementsByTagName("summary")->item(0);
if ($content) {
$base = $this->xpath->evaluate("string(ancestor-or-self::*[@xml:base][1]/@xml:base)", $content);
if ($content->hasAttribute('type')) {
if ($content->getAttribute('type') == 'xhtml') {
for ($i = 0; $i < $content->childNodes->length; $i++) {
$child = $content->childNodes->item($i);
if ($child->hasChildNodes()) {
return $this->rewrite_content_to_base($base, $this->doc->saveHTML($child));
}
}
}
}
return $this->rewrite_content_to_base($base, $this->subtree_or_text($content));
}
return '';
}
/**
* @return array<int, string>
*/
function get_categories(): array {
$categories = $this->elem->getElementsByTagName("category");
$cats = [];
foreach ($categories as $cat) {
if ($cat->hasAttribute("term"))
array_push($cats, $cat->getAttribute("term"));
}
$categories = $this->xpath->query("dc:subject", $this->elem);
foreach ($categories as $cat) {
array_push($cats, $cat->nodeValue);
}
return $this->normalize_categories($cats);
}
/**
* @return array<int, FeedEnclosure>
*/
function get_enclosures(): array {
$links = $this->elem->getElementsByTagName("link");
$encs = [];
foreach ($links as $link) {
/** @phpstan-ignore-next-line */
if ($link->hasAttribute("href") && $link->hasAttribute("rel")) {
$base = $this->xpath->evaluate("string(ancestor-or-self::*[@xml:base][1]/@xml:base)", $link);
if ($link->getAttribute("rel") == "enclosure") {
$enc = new FeedEnclosure();
$enc->type = clean($link->getAttribute("type"));
$enc->length = clean($link->getAttribute("length"));
$enc->link = clean($link->getAttribute("href"));
if (!empty($base)) {
$enc->link = UrlHelper::rewrite_relative($base, $enc->link);
}
array_push($encs, $enc);
}
}
}
array_push($encs, ...parent::get_enclosures());
return $encs;
}
function get_language(): string {
$lang = $this->elem->getAttributeNS(self::NS_XML, "lang");
if (!empty($lang)) {
return clean($lang);
} else {
// Fall back to the language declared on the feed, if any.
foreach ($this->doc->childNodes as $child) {
if (method_exists($child, "getAttributeNS")) {
return clean($child->getAttributeNS(self::NS_XML, "lang"));
}
}
}
return '';
}
}
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