mirror of https://github.com/danoloan10/rss-bridge
463 lines
17 KiB
PHP
463 lines
17 KiB
PHP
<?php
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class CssSelectorComplexBridge extends BridgeAbstract
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{
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const MAINTAINER = 'Lars Stegman';
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const NAME = 'CSS Selector Complex Bridge';
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const URI = 'https://github.com/RSS-Bridge/rss-bridge/';
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const DESCRIPTION = <<<EOT
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Convert any site to RSS feed using CSS selectors (Advanced Users). The bridge first selects
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the element describing the article entries. It then extracts the links to the articles from
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these elements. It then, depending on the setting "Load article from page", either parses
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the selected elements, or downloads the page for each article and parses those. Parsing the
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elements or page is done using the provided selectors.
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EOT;
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const PARAMETERS = [
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[
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'home_page' => [
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'name' => 'Site URL: Page with latest articles',
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'exampleValue' => 'https://example.com/blog/',
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'required' => true
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],
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'cookie' => [
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'name' => '[Optional] Cookie',
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'title' => <<<EOT
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Use when the website does not send the page contents, unless a static cookie is included.
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EOT,
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'exampleValue' => 'sessionId=deadb33f'
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],
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'title_cleanup' => [
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'name' => '[Optional] Text to remove from feed title',
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'title' => <<<EOT
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Text to remove from the feed title, which is read from the article list page.
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EOT,
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'exampleValue' => ' | BlogName',
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],
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'entry_element_selector' => [
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'name' => 'Selector for article entry elements',
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'title' => <<<EOT
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This bridge works using CSS selectors, e.g. "div.article" will match all
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<div class="article">...</div> on home page, each one being treated as a feed item.
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Use the URL selector option to select the `a` element with the
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`href` to the article link. If this option is not configured, the first encountered
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`a` element is used.
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EOT,
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'exampleValue' => 'div.article',
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'required' => true
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],
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'url_selector' => [
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'name' => '[Optional] Selector for link elements',
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'title' => <<<EOT
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The selector to find `a` elements in the entry element. If empty,
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the first encountered `a` element is used. The `href` property
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is used to create entries in the feed.
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EOT,
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'exampleValue' => 'a.article',
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'defaultValue' => 'a'
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],
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'url_pattern' => [
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'name' => '[Optional] Pattern for site URLs to keep in feed',
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'title' => 'Optionally filter items by applying a regular expression on their URL',
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'exampleValue' => '/blog/article/.*',
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],
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'limit' => self::LIMIT,
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'use_article_pages' => [
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'name' => 'Load article from page',
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'title' => <<<EOT
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If true, the article page is load and parsed to get the article contents using
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the css selectors. (Slower!)
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Otherwise, the element selected by the article entry selector is used.
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EOT,
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'type' => 'checkbox'
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],
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'article_page_content_selector' => [
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'name' => '[Optional] Selector to select article element',
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'title' => 'Extract the article from its page using the provided selector',
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'exampleValue' => 'article.content',
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],
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'content_cleanup' => [
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'name' => '[Optional] Content cleanup: selector for items to remove',
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'title' => 'Selector for unnecessary elements to remove inside article contents.',
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'exampleValue' => 'div.ads, div.comments',
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],
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'title_selector' => [
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'name' => '[Optional] Selector for the article title',
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'title' => 'Selector to select the article title',
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'defaultValue' => 'h1'
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],
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'category_selector' => [
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'name' => '[Optional] Categories',
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'title' => <<<EOT
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Selector to extract the catgories the article has
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EOT,
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'exampleValue' => 'span.category, #main-category'
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],
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'author_selector' => [
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'name' => '[Optional] Author',
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'title' => <<<EOT
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Selector to extract the author of the article. If multiple elements are selected
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the first one is used.
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EOT,
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'exampleValue' => 'span#author'
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],
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'time_selector' => [
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'name' => '[Optional] Time selector',
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'title' => <<<EOT
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Selector to extract the timestamp of the article. If the element
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is an html5 `time` element, the value for the `datetime` attribute is used.
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EOT,
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],
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'time_format' => [
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'name' => '[Optional] Format string for parsing time',
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'title' => <<<EOT
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The format to use to parse the timestamp. See
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https://www.php.net/manual/en/datetimeimmutable.createfromformat.php
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for the format specification.
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EOT
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],
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'remove_styling' => [
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'name' => '[Optional] Remove styling',
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'title' => 'Remove class and style attributes from the page elements',
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'type' => 'checkbox'
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]
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]
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];
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private $feedName = '';
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public function getURI()
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{
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$url = $this->getInput('home_page');
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if (empty($url)) {
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$url = parent::getURI();
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}
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return $url;
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}
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public function getName()
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{
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if (!empty($this->feedName)) {
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return $this->feedName;
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}
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return parent::getName();
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}
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protected function getHeaders()
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{
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$headers = [];
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$cookie = $this->getInput('cookie');
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if (!empty($cookie)) {
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$headers[] = 'Cookie: ' . $cookie;
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}
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return $headers;
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}
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public function collectData()
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{
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$url = $this->getInput('home_page');
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$headers = $this->getHeaders();
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$entry_element_selector = $this->getInput('entry_element_selector');
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$url_selector = $this->getInput('url_selector');
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$url_pattern = $this->getInput('url_pattern');
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$limit = $this->getInput('limit') ?? 10;
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$use_article_pages = $this->getInput('use_article_pages');
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$article_page_content_selector = $this->getInput('article_page_content_selector');
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$content_cleanup = $this->getInput('content_cleanup');
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$title_selector = $this->getInput('title_selector');
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$title_cleanup = $this->getInput('title_cleanup');
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$time_selector = $this->getInput('time_selector');
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$time_format = $this->getInput('time_format');
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$category_selector = $this->getInput('category_selector');
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$author_selector = $this->getInput('author_selector');
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$remove_styling = $this->getInput('remove_styling');
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$html = defaultLinkTo(getSimpleHTMLDOM($url, $headers), $url);
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$this->feedName = $this->getTitle($html, $title_cleanup);
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$entry_elements = $this->htmlFindEntryElements($html, $entry_element_selector, $url_selector, $url_pattern, $limit);
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if (empty($entry_elements)) {
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return;
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}
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// Fetch the elements from the article pages.
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if ($use_article_pages) {
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if (empty($article_page_content_selector)) {
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returnClientError('`Article selector` is required when `Load article page` is enabled');
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}
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foreach (array_keys($entry_elements) as $uri) {
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$entry_elements[$uri] = $this->fetchArticleElementFromPage($uri, $article_page_content_selector);
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}
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}
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foreach ($entry_elements as $uri => $element) {
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$entry = $this->parseEntryElement(
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$element,
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$title_selector,
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$author_selector,
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$category_selector,
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$time_selector,
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$time_format,
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$content_cleanup,
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$this->feedName,
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$remove_styling
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);
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$entry['uri'] = $uri;
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$this->items[] = $entry;
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}
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}
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/**
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* Filter a list of URLs using a pattern and limit
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* @param array $links List of URLs
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* @param string $url_pattern Pattern to look for in URLs
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* @param int $limit Optional maximum amount of URLs to return
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* @return array Array of URLs
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*/
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protected function filterUrlList($links, $url_pattern, $limit = 0)
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{
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if (!empty($url_pattern)) {
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$url_pattern = '/' . str_replace('/', '\/', $url_pattern) . '/';
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$links = array_filter($links, function ($url) use ($url_pattern) {
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return preg_match($url_pattern, $url) === 1;
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});
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}
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if ($limit > 0 && count($links) > $limit) {
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$links = array_slice($links, 0, $limit);
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}
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return $links;
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}
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/**
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* Retrieve title from webpage URL or DOM
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* @param string|object $page URL or DOM to retrieve title from
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* @param string $title_cleanup optional string to remove from webpage title, e.g. " | BlogName"
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* @return string Webpage title
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*/
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protected function getTitle($page, $title_cleanup)
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{
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if (is_string($page)) {
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$page = getSimpleHTMLDOMCached($page);
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}
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$title = html_entity_decode($page->find('title', 0)->plaintext);
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if (!empty($title)) {
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$title = trim(str_replace($title_cleanup, '', $title));
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}
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return $title;
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}
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/**
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* Remove all elements from HTML content matching cleanup selector
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* @param string|object $content HTML content as HTML object or string
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* @return string|object Cleaned content (same type as input)
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*/
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protected function cleanArticleContent($content, $cleanup_selector, $remove_styling)
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{
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$string_convert = false;
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if (is_string($content)) {
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$string_convert = true;
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$content = str_get_html($content);
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}
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if (!empty($cleanup_selector)) {
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foreach ($content->find($cleanup_selector) as $item_to_clean) {
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$item_to_clean->outertext = '';
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}
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}
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if ($remove_styling) {
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foreach (['class', 'style'] as $attribute_to_remove) {
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foreach ($content->find('[' . $attribute_to_remove . ']') as $item_to_clean) {
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$item_to_clean->removeAttribute($attribute_to_remove);
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}
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}
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}
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if ($string_convert) {
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$content = $content->outertext;
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}
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return $content;
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}
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/**
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* Retrieve first N link+element from webpage URL or DOM satisfying the specified criteria
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* @param string|object $page URL or DOM to retrieve feed items from
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* @param string $entry_selector DOM selector for matching HTML elements that contain article
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* entries
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* @param string $url_selector DOM selector for matching links
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* @param string $url_pattern Optional filter to keep only links matching the pattern
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* @param int $limit Optional maximum amount of URLs to return
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* @return array of items { <uri> => <html-element> }
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*/
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protected function htmlFindEntryElements($page, $entry_selector, $url_selector, $url_pattern = '', $limit = 0)
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{
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if (is_string($page)) {
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$page = getSimpleHTMLDOM($page);
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}
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$entryElements = $page->find($entry_selector);
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if (empty($entryElements)) {
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returnClientError('No entry elements for entry selector');
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}
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// Extract URIs with the associated entry element
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$links_with_elements = [];
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foreach ($entryElements as $entry) {
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$url_element = $entry->find($url_selector, 0);
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if (is_null($url_element)) {
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// No `a` element found in this entry
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if ($entry->tag == 'a') {
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$url_element = $entry;
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} else {
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continue;
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}
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}
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$links_with_elements[$url_element->href] = $entry;
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}
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if (empty($links_with_elements)) {
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returnClientError('The provided URL selector matches some elements, but they do not
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contain links.');
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}
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// Filter using the URL pattern
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$filtered_urls = $this->filterUrlList(array_keys($links_with_elements), $url_pattern, $limit);
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if (empty($filtered_urls)) {
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returnClientError('No results for URL pattern');
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}
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$items = [];
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foreach ($filtered_urls as $link) {
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$items[$link] = $links_with_elements[$link];
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}
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return $items;
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}
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/**
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* Retrieve article element from its URL using content selector and return the DOM element
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* @param string $entry_url URL to retrieve article from
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* @param string $content_selector HTML selector for extracting content, e.g. "article.content"
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* @return article DOM element
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*/
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protected function fetchArticleElementFromPage($entry_url, $content_selector)
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{
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$entry_html = getSimpleHTMLDOMCached($entry_url);
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$article_content = $entry_html->find($content_selector, 0);
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if (is_null($article_content)) {
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returnClientError('Could not get article content at URL: ' . $entry_url);
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}
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$article_content = defaultLinkTo($article_content, $entry_url);
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return $article_content;
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}
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protected function parseTimeStrAsTimestamp($timeStr, $format)
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{
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$date = date_parse_from_format($format, $timeStr);
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if ($date['error_count'] != 0) {
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returnClientError('Error while parsing time string');
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}
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$timestamp = mktime(
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$date['hour'],
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$date['minute'],
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$date['second'],
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$date['month'],
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$date['day'],
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$date['year']
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);
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if ($timestamp == false) {
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returnClientError('Error while creating timestamp');
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}
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return $timestamp;
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}
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/**
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* Retrieve article content from its URL using content selector and return a feed item
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* @param object $entry_html A DOM element containing the article
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* @param string $title_selector A selector to the article title from the article
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* @param string $author_selector A selector to find the article author
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* @param string $time_selector A selector to get the article publication time.
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* @param string $time_format The format to parse the time_selector.
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* @param string $content_cleanup Optional selector for removing elements, e.g. "div.ads,
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* div.comments"
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* @param string $title_default Optional title to use when could not extract title reliably
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* @param bool $remove_styling Whether to remove class and style attributes from the HTML
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* @return array Entry data: uri, title, content
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*/
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protected function parseEntryElement(
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$entry_html,
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$title_selector = null,
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$author_selector = null,
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$category_selector = null,
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$time_selector = null,
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$time_format = null,
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$content_cleanup = null,
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$title_default = null,
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$remove_styling = false
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) {
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$article_content = convertLazyLoading($entry_html);
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$article_title = '';
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if (is_null($title_selector)) {
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$article_title = $title_default;
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} else {
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$titleElement = $entry_html->find($title_selector, 0);
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if ($titleElement) {
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$article_title = trim($titleElement->innertext);
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}
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}
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$author = null;
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if (!is_null($author_selector) && $author_selector != '') {
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$author = trim($entry_html->find($author_selector, 0)->innertext);
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}
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$categories = [];
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if (!is_null($category_selector && $category_selector != '')) {
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$category_elements = $entry_html->find($category_selector);
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foreach ($category_elements as $category_element) {
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$categories[] = trim($category_element->innertext);
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}
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}
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$time = null;
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if (!is_null($time_selector) && $time_selector != '') {
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$time_element = $entry_html->find($time_selector, 0);
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$time = $time_element->getAttribute('datetime');
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if (is_null($time)) {
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$time = $time_element->innertext;
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}
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$this->parseTimeStrAsTimestamp($time, $time_format);
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}
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$article_content = $this->cleanArticleContent($article_content, $content_cleanup, $remove_styling);
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$item = [];
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$item['title'] = $article_title;
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$item['content'] = $article_content;
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$item['categories'] = $categories;
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$item['timestamp'] = $time;
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$item['author'] = $author;
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return $item;
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}
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}
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