mirror of
https://github.com/RSS-Bridge/rss-bridge.git
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310 lines
12 KiB
PHP
310 lines
12 KiB
PHP
<?php
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class CssSelectorBridge extends BridgeAbstract
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{
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const MAINTAINER = 'ORelio';
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const NAME = 'CSS Selector Bridge';
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const URI = 'https://github.com/RSS-Bridge/rss-bridge/';
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const DESCRIPTION = 'Convert any site to RSS feed using CSS selectors (Advanced Users)';
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const PARAMETERS = [
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[
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'home_page' => [
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'name' => 'Site URL: Home 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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'url_selector' => [
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'name' => 'Selector for article links or their parent elements',
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'title' => <<<EOT
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This bridge works using CSS selectors, e.g. "a.article" will match all <a class="article"
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href="URL">TITLE</a> on home page, each one being treated as a feed item.
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Instead of just a link you can selet one of its parent element. Everything inside that
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element becomes feed item content, e.g. image and summary present on home page.
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When doing so, the first link inside the selected element becomes feed item URL/Title.
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EOT,
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'exampleValue' => 'a.article',
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'required' => true
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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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'content_selector' => [
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'name' => '[Optional] Selector to expand each article content',
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'title' => <<<EOT
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When specified, the bridge will fetch each article from its URL
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and extract content using the provided selector (Slower!)
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EOT,
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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: List of 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_cleanup' => [
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'name' => '[Optional] Text to remove from expanded article title',
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'title' => <<<EOT
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When fetching each article page, feed item title comes from page title.
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Specify here some text from page title that need to be removed, e.g. " | BlogName".
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EOT,
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'exampleValue' => ' | BlogName',
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],
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'discard_thumbnail' => [
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'name' => '[Optional] Discard thumbnail set by site author',
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'title' => 'Some sites set their logo as thumbnail for every article. Use this option to discard it.',
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'type' => 'checkbox',
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],
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'thumbnail_as_header' => [
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'name' => '[Optional] Insert thumbnail as article header',
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'title' => 'Insert article main image on top of article contents.',
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'type' => 'checkbox',
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],
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'limit' => self::LIMIT
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]
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];
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protected $feedName = '';
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protected $homepageUrl = '';
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public function getURI()
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{
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$url = $this->homepageUrl;
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if (empty($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 $this->feedName;
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}
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return parent::getName();
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}
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public function collectData()
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{
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$this->homepageUrl = $this->getInput('home_page');
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$url_selector = $this->getInput('url_selector');
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$url_pattern = $this->getInput('url_pattern');
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$content_selector = $this->getInput('content_selector');
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$content_cleanup = $this->getInput('content_cleanup');
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$title_cleanup = $this->getInput('title_cleanup');
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$discard_thumbnail = $this->getInput('discard_thumbnail');
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$thumbnail_as_header = $this->getInput('thumbnail_as_header');
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$limit = $this->getInput('limit') ?? 10;
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$html = defaultLinkTo(getSimpleHTMLDOM($this->homepageUrl), $this->homepageUrl);
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$this->feedName = $this->titleCleanup($this->getPageTitle($html), $title_cleanup);
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$items = $this->htmlFindEntries($html, $url_selector, $url_pattern, $limit, $content_cleanup);
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if (empty($content_selector)) {
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$this->items = $items;
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} else {
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foreach ($items as $item) {
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$item = $this->expandEntryWithSelector(
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$item['uri'],
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$content_selector,
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$content_cleanup,
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$title_cleanup,
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$item['title']
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);
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if ($discard_thumbnail && isset($item['enclosures'])) {
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unset($item['enclosures']);
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}
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if ($thumbnail_as_header && isset($item['enclosures'][0])) {
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$item['content'] = '<p><img src="' . $item['enclosures'][0] . '" /></p>' . $item['content'];
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}
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$this->items[] = $item;
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}
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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 $page URL or DOM to retrieve title from
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* @return string Webpage title
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*/
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protected function getPageTitle($page)
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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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return $title;
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}
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/**
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* Clean Article title. Remove constant part that appears in every title such as blog name.
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* @param string $title Title to clean, e.g. "Article Name | BlogName"
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* @param string $title_cleanup string to remove from webpage title, e.g. " | BlogName"
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* @return string Cleaned Title
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*/
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protected function titleCleanup($title, $title_cleanup)
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{
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if (!empty($title) && !empty($title_cleanup)) {
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return trim(str_replace($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, $cleanup_selector)
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{
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$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 ($string_convert) {
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$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+title+truncated-content 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 $url_selector DOM selector for matching links or their parent element
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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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* @param string $content_cleanup Optional selector for removing elements, e.g. "div.ads, div.comments"
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* @return array of items {'uri': entry_url, 'title': entry_title, ['content': when present in DOM] }
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*/
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protected function htmlFindEntries($page, $url_selector, $url_pattern = '', $limit = 0, $content_cleanup = null)
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{
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if (is_string($page)) {
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$page = getSimpleHTMLDOM($page);
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}
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$links = $page->find($url_selector);
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if (empty($links)) {
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returnClientError('No results for URL selector');
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}
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$link_to_item = [];
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foreach ($links as $link) {
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$item = [];
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if ($link->innertext != $link->plaintext) {
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$item['content'] = $link->innertext;
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}
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if ($link->tag != 'a') {
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$link = $link->find('a', 0);
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if (is_null($link)) {
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continue;
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}
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}
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$item['uri'] = $link->href;
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$item['title'] = $link->plaintext;
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if (isset($item['content'])) {
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$item['content'] = convertLazyLoading($item['content']);
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$item['content'] = defaultLinkTo($item['content'], $item['uri']);
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$item['content'] = $this->cleanArticleContent($item['content'], $content_cleanup);
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}
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$link_to_item[$link->href] = $item;
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}
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if (empty($link_to_item)) {
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returnClientError('The provided URL selector matches some elements, but they do not contain links.');
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}
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$links = $this->filterUrlList(array_keys($link_to_item), $url_pattern, $limit);
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if (empty($links)) {
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returnClientError('No results for URL pattern');
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}
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$items = [];
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foreach ($links as $link) {
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$items[] = $link_to_item[$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 content from its URL using content selector and return a feed item
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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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* @param string $content_cleanup Optional selector for removing elements, e.g. "div.ads, div.comments"
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* @param string $title_cleanup Optional string to remove from article title, e.g. " | BlogName"
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* @param string $title_default Optional title to use when could not extract title reliably
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* @return array Entry data: uri, title, content
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*/
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protected function expandEntryWithSelector($entry_url, $content_selector, $content_cleanup = null, $title_cleanup = null, $title_default = null)
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{
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if (empty($content_selector)) {
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returnClientError('Please specify a content selector');
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}
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$entry_html = getSimpleHTMLDOMCached($entry_url);
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$item = html_find_seo_metadata($entry_html);
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if (empty($item['uri'])) {
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$item['uri'] = $entry_url;
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}
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if (empty($item['title'])) {
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$article_title = $this->getPageTitle($entry_html, $title_cleanup);
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if (!empty($title_default) && (empty($article_title) || $article_title === $this->feedName)) {
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$article_title = $title_default;
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}
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$item['title'] = $article_title;
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}
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$item['title'] = $this->titleCleanup($item['title'], $title_cleanup);
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$article_content = $entry_html->find($content_selector);
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if (!empty($article_content)) {
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$article_content = $article_content[0];
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$article_content = convertLazyLoading($article_content);
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$article_content = defaultLinkTo($article_content, $entry_url);
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$article_content = $this->cleanArticleContent($article_content, $content_cleanup);
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$item['content'] = $article_content;
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} else if (!empty($item['content'])) {
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$item['content'] .= '<br /><p><em>Could not extract full content, selector may need to be updated.</em></p>';
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}
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return $item;
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}
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}
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