246 lines
6.0 KiB
PHP
246 lines
6.0 KiB
PHP
<?php
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class FeedParser {
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/** @var DOMDocument */
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private $doc;
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/** @var string|null */
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private $error = null;
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/** @var array<string> */
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private $libxml_errors = [];
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/** @var array<FeedItem> */
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private $items = [];
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/** @var string|null */
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private $link;
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/** @var string|null */
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private $title;
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/** @var FeedParser::FEED_*|null */
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private $type;
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/** @var DOMXPath|null */
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private $xpath;
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const FEED_RDF = 0;
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const FEED_RSS = 1;
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const FEED_ATOM = 2;
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function __construct(string $data) {
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libxml_use_internal_errors(true);
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libxml_clear_errors();
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$this->doc = new DOMDocument();
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$this->doc->loadXML($data);
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mb_substitute_character("none");
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$error = libxml_get_last_error();
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if ($error) {
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foreach (libxml_get_errors() as $error) {
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if ($error->level == LIBXML_ERR_FATAL) {
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// currently only the first error is reported
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$this->error ??= Errors::format_libxml_error($error);
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$this->libxml_errors[] = Errors::format_libxml_error($error);
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}
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}
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}
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libxml_clear_errors();
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}
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function init() : void {
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$root = $this->doc->firstChild;
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$xpath = new DOMXPath($this->doc);
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$xpath->registerNamespace('atom', 'http://www.w3.org/2005/Atom');
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$xpath->registerNamespace('atom03', 'http://purl.org/atom/ns#');
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$xpath->registerNamespace('media', 'http://search.yahoo.com/mrss/');
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$xpath->registerNamespace('rdf', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#');
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$xpath->registerNamespace('slash', 'http://purl.org/rss/1.0/modules/slash/');
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$xpath->registerNamespace('dc', 'http://purl.org/dc/elements/1.1/');
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$xpath->registerNamespace('content', 'http://purl.org/rss/1.0/modules/content/');
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$xpath->registerNamespace('thread', 'http://purl.org/syndication/thread/1.0');
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$this->xpath = $xpath;
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$root_list = $xpath->query("(//atom03:feed|//atom:feed|//channel|//rdf:rdf|//rdf:RDF)");
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if (!empty($root_list) && $root_list->length > 0) {
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/** @var DOMElement|null $root */
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$root = $root_list->item(0);
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if ($root) {
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switch (mb_strtolower($root->tagName)) {
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case "rdf:rdf":
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$this->type = $this::FEED_RDF;
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break;
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case "channel":
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$this->type = $this::FEED_RSS;
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break;
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case "feed":
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case "atom:feed":
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$this->type = $this::FEED_ATOM;
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break;
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default:
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$this->error ??= "Unknown/unsupported feed type";
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return;
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}
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}
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switch ($this->type) {
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case $this::FEED_ATOM:
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$title = $xpath->query("//atom:feed/atom:title")->item(0);
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if (!$title)
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$title = $xpath->query("//atom03:feed/atom03:title")->item(0);
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if ($title) {
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$this->title = $title->nodeValue;
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}
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$link = $xpath->query("//atom:feed/atom:link[not(@rel)]")->item(0);
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if (!$link)
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$link = $xpath->query("//atom:feed/atom:link[@rel='alternate']")->item(0);
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if (!$link)
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$link = $xpath->query("//atom03:feed/atom03:link[not(@rel)]")->item(0);
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if (!$link)
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$link = $xpath->query("//atom03:feed/atom03:link[@rel='alternate']")->item(0);
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/** @var DOMElement|null $link */
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if ($link && $link->hasAttributes()) {
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$this->link = $link->getAttribute("href");
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}
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$articles = $xpath->query("//atom:entry");
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if (empty($articles) || $articles->length == 0)
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$articles = $xpath->query("//atom03:entry");
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foreach ($articles as $article) {
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array_push($this->items, new FeedItem_Atom($article, $this->doc, $this->xpath));
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}
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break;
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case $this::FEED_RSS:
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$title = $xpath->query("//channel/title")->item(0);
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if ($title) {
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$this->title = $title->nodeValue;
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}
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/** @var DOMElement|null $link */
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$link = $xpath->query("//channel/link")->item(0);
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if ($link) {
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if ($link->getAttribute("href"))
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$this->link = $link->getAttribute("href");
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else if ($link->nodeValue)
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$this->link = $link->nodeValue;
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}
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$articles = $xpath->query("//channel/item");
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foreach ($articles as $article) {
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array_push($this->items, new FeedItem_RSS($article, $this->doc, $this->xpath));
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}
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break;
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case $this::FEED_RDF:
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$xpath->registerNamespace('rssfake', 'http://purl.org/rss/1.0/');
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$title = $xpath->query("//rssfake:channel/rssfake:title")->item(0);
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if ($title) {
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$this->title = $title->nodeValue;
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}
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$link = $xpath->query("//rssfake:channel/rssfake:link")->item(0);
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if ($link) {
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$this->link = $link->nodeValue;
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}
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$articles = $xpath->query("//rssfake:item");
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foreach ($articles as $article) {
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array_push($this->items, new FeedItem_RSS($article, $this->doc, $this->xpath));
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}
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break;
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}
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if ($this->title) $this->title = trim($this->title);
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if ($this->link) $this->link = trim($this->link);
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} else {
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$this->error ??= "Unknown/unsupported feed type";
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return;
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}
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}
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/** @deprecated use Errors::format_libxml_error() instead */
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function format_error(LibXMLError $error) : string {
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return Errors::format_libxml_error($error);
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}
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// libxml may have invalid unicode data in error messages
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function error() : string {
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return UConverter::transcode($this->error ?? '', 'UTF-8', 'UTF-8');
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}
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/** @return array<string> - WARNING: may return invalid unicode data */
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function errors() : array {
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return $this->libxml_errors;
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}
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function get_link() : string {
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return clean($this->link ?? '');
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}
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function get_title() : string {
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return clean($this->title ?? '');
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}
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/** @return array<FeedItem> */
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function get_items() : array {
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return $this->items;
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}
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/** @return array<string> */
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function get_links(string $rel) : array {
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$rv = array();
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switch ($this->type) {
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case $this::FEED_ATOM:
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$links = $this->xpath->query("//atom:feed/atom:link");
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foreach ($links as $link) {
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if (!$rel || $link->hasAttribute('rel') && $link->getAttribute('rel') == $rel) {
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array_push($rv, clean(trim($link->getAttribute('href'))));
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}
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}
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break;
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case $this::FEED_RSS:
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$links = $this->xpath->query("//atom:link");
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foreach ($links as $link) {
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if (!$rel || $link->hasAttribute('rel') && $link->getAttribute('rel') == $rel) {
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array_push($rv, clean(trim($link->getAttribute('href'))));
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}
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}
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break;
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}
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return $rv;
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}
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}
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