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Separate feed type detection from init, don't subscribe on failures.

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Also some FeedParser tweaks.
This commit is contained in:
wn_
2025-06-22 16:31:50 +00:00
parent 46e05583a9
commit 0cd788220d
4 changed files with 85 additions and 67 deletions
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136
classes/FeedParser.php
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@@ -14,8 +14,8 @@ class FeedParser {
private ?string $title = null;
/** @var FeedParser::FEED_*|null */
private ?int $type = null;
/** @var FeedParser::FEED_* */
private int $type;
private ?DOMXPath $xpath = null;
@@ -27,6 +27,9 @@ class FeedParser {
function __construct(string $data) {
libxml_use_internal_errors(true);
libxml_clear_errors();
$this->type = $this::FEED_UNKNOWN;
$this->doc = new DOMDocument();
$this->doc->loadXML($data);
@@ -43,71 +46,54 @@ class FeedParser {
}
}
}
libxml_clear_errors();
if ($this->error)
return;
$this->xpath = new DOMXPath($this->doc);
$this->xpath->registerNamespace('atom', 'http://www.w3.org/2005/Atom');
$this->xpath->registerNamespace('atom03', 'http://purl.org/atom/ns#');
$this->xpath->registerNamespace('media', 'http://search.yahoo.com/mrss/');
$this->xpath->registerNamespace('rdf', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#');
$this->xpath->registerNamespace('slash', 'http://purl.org/rss/1.0/modules/slash/');
$this->xpath->registerNamespace('dc', 'http://purl.org/dc/elements/1.1/');
$this->xpath->registerNamespace('content', 'http://purl.org/rss/1.0/modules/content/');
$this->xpath->registerNamespace('thread', 'http://purl.org/syndication/thread/1.0');
}
function init() : void {
$xpath = new DOMXPath($this->doc);
$xpath->registerNamespace('atom', 'http://www.w3.org/2005/Atom');
$xpath->registerNamespace('atom03', 'http://purl.org/atom/ns#');
$xpath->registerNamespace('media', 'http://search.yahoo.com/mrss/');
$xpath->registerNamespace('rdf', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#');
$xpath->registerNamespace('slash', 'http://purl.org/rss/1.0/modules/slash/');
$xpath->registerNamespace('dc', 'http://purl.org/dc/elements/1.1/');
$xpath->registerNamespace('content', 'http://purl.org/rss/1.0/modules/content/');
$xpath->registerNamespace('thread', 'http://purl.org/syndication/thread/1.0');
/**
* @return bool false if initialization couldn't occur (e.g. parsing error or unrecognized feed type), otherwise true
*/
function init(): bool {
if ($this->error)
return false;
$this->xpath = $xpath;
$type = $this->get_type();
$root_list = $xpath->query("(//atom03:feed|//atom:feed|//channel|//rdf:rdf|//rdf:RDF)");
if ($type === self::FEED_UNKNOWN)
return false;
if (!empty($root_list) && $root_list->length > 0) {
$xpath = $this->xpath;
/** @var DOMElement|null $root */
$root = $root_list->item(0);
if ($root) {
$this->type = match (mb_strtolower($root->tagName)) {
'rdf:rdf' => $this::FEED_RDF,
'channel' => $this::FEED_RSS,
'feed', 'atom:feed' => $this::FEED_ATOM,
default => $this::FEED_UNKNOWN,
};
if ($this->type === $this::FEED_UNKNOWN) {
$this->error ??= 'Unknown/unsupported feed type';
return;
}
}
switch ($this->type) {
switch ($type) {
case $this::FEED_ATOM:
$title = $xpath->query("//atom:feed/atom:title")->item(0);
if (!$title)
$title = $xpath->query("//atom03:feed/atom03:title")->item(0);
$title = $xpath->query('//atom:feed/atom:title')->item(0)
?? $xpath->query('//atom03:feed/atom03:title')->item(0);
if ($title) {
$this->title = $title->nodeValue;
}
$link = $xpath->query("//atom:feed/atom:link[not(@rel)]")->item(0);
if (!$link)
$link = $xpath->query("//atom:feed/atom:link[@rel='alternate']")->item(0);
if (!$link)
$link = $xpath->query("//atom03:feed/atom03:link[not(@rel)]")->item(0);
if (!$link)
$link = $xpath->query("//atom03:feed/atom03:link[@rel='alternate']")->item(0);
/** @var DOMElement|null $link */
if ($link && $link->hasAttributes()) {
$this->link = $link->getAttribute("href");
}
$link = $xpath->query('//atom:feed/atom:link[not(@rel)]')->item(0)
?? $xpath->query("//atom:feed/atom:link[@rel='alternate']")->item(0)
?? $xpath->query('//atom03:feed/atom03:link[not(@rel)]')->item(0)
?? $xpath->query("//atom03:feed/atom03:link[@rel='alternate']")->item(0);
if ($link?->getAttribute('href'))
$this->link = $link->getAttribute('href');
$articles = $xpath->query("//atom:entry");
@@ -165,16 +151,15 @@ class FeedParser {
}
break;
}
if ($this->title) $this->title = trim($this->title);
if ($this->link) $this->link = trim($this->link);
} else {
$this->error ??= "Unknown/unsupported feed type";
return;
}
if ($this->title)
$this->title = trim($this->title);
if ($this->link)
$this->link = trim($this->link);
return true;
}
/** @deprecated use Errors::format_libxml_error() instead */
@@ -192,6 +177,33 @@ class FeedParser {
return $this->libxml_errors;
}
/**
* @return FeedParser::FEED_*
*/
function get_type(): int {
if ($this->type !== self::FEED_UNKNOWN || $this->error)
return $this->type;
$root_list = $this->xpath->query('(//atom03:feed|//atom:feed|//channel|//rdf:rdf|//rdf:RDF)');
if ($root_list && $root_list->length > 0) {
/** @var DOMElement $root */
$root = $root_list->item(0);
$this->type = match (mb_strtolower($root->tagName)) {
'rdf:rdf' => self::FEED_RDF,
'channel' => self::FEED_RSS,
'feed', 'atom:feed' => self::FEED_ATOM,
default => self::FEED_UNKNOWN,
};
}
if ($this->type === self::FEED_UNKNOWN)
$this->error ??= 'Unknown/unsupported feed type';
return $this->type;
}
function get_link() : string {
return clean($this->link ?? '');
}