koblog/bl-plugins/rss/plugin.php

<?php

class pluginRSS extends Plugin {

	public function init() {
		$this->dbFields = array(
			'numberOfItems'=>5
		);
	}

	public function form() {
		global $L;

        $html  = '<div class="mb-3">';
        $html .= '<label class="form-label" for="label">'.$L->get('RSS URL').'</label>';
        $html .= '<a href="'.DOMAIN_BASE.'rss.xml">'.DOMAIN_BASE.'rss.xml</a>';
        $html .= '</div>';

        $html  = '<div class="mb-3">';
        $html .= '<label class="form-label" for="numberOfItems">'.$L->get('Number of items').'</label>';
        $html .= '<input class="form-control" id="numberOfItems" name="numberOfItems" type="text" value="'.$this->getValue('numberOfItems').'">';
        $html .= '<div class="form-text">'.$L->get('The number of items to display in the feed').'</div>';
        $html .= '</div>';

		return $html;
	}

    private function encodeURL($url) {
        return preg_replace_callback('/[^\x20-\x7f]/', function($match) { return urlencode($match[0]); }, $url);
    }

	private function createXML() {
		global $site;
		global $pages;
		global $url;

		// Number of pages to show
		$numberOfItems = $this->getValue('numberOfItems');

		// Get the list of public pages (sticky and static included)
		$list = $pages->getList(
			$pageNumber=1,
			$numberOfItems,
			$published=true,
			$static=true,
			$sticky=true,
			$draft=false,
			$scheduled=false
		);

		$xml = '<?xml version="1.0" encoding="UTF-8" ?>';
		$xml .= '<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">';
		$xml .= '<channel>';
		$xml .= '<atom:link href="'.DOMAIN_BASE.'rss.xml" rel="self" type="application/rss+xml" />';
		$xml .= '<title>'.$site->title().'</title>';
		$xml .= '<link>'.$this->encodeURL($site->url()).'</link>';
		$xml .= '<description>'.$site->description().'</description>';
		$xml .= '<lastBuildDate>'.date(DATE_RSS).'</lastBuildDate>';

		// Get keys of pages
		foreach ($list as $pageKey) {
			try {
				// Create the page object from the page key
				$page = new Page($pageKey);
				$xml .= '<item>';
				$xml .= '<title>'.$page->title().'</title>';
				$xml .= '<link>'.$this->encodeURL($page->permalink()).'</link>';
				if ($page->coverImage()) {
					$xml .= '<image>'.$page->coverImage().'</image>';
				}
				$xml .= '<description>'.Sanitize::html($page->contentBreak()).'</description>';
				$xml .= '<pubDate>'.date(DATE_RSS,strtotime($page->getValue('dateRaw'))).'</pubDate>';
				$xml .= '<guid isPermaLink="false">'.$page->uuid().'</guid>';
				$xml .= '</item>';
			} catch (Exception $e) {
				// Continue
			}
		}

		$xml .= '</channel></rss>';

		// New DOM document
		$doc = new DOMDocument();
		$doc->formatOutput = true;
		$doc->loadXML($xml);
		return $doc->save($this->workspace().'rss.xml');
	}

	public function install($position=0) {
		parent::install($position);
		return $this->createXML();
	}

	public function afterPageCreate() {
		$this->createXML();
	}

	public function afterPageModify() {
		$this->createXML();
	}

	public function afterPageDelete() {
		$this->createXML();
	}

	public function siteHead() {
		return '<link rel="alternate" type="application/rss+xml" href="'.DOMAIN_BASE.'rss.xml" title="RSS Feed">'.PHP_EOL;
	}

	public function beforeAll() {
		$webhook = 'rss.xml';
		if ($this->webhook($webhook)) {
			// Send XML header
			header('Content-type: text/xml');
			$doc = new DOMDocument();

			// Load XML
			libxml_disable_entity_loader(false);
			$doc->load($this->workspace().'rss.xml');
			libxml_disable_entity_loader(true);

			// Print the XML
			echo $doc->saveXML();

			// Stop Bludit execution
			exit(0);
		}
	}

}