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Current File : /home/church/www/wp-content/plugins/event-list/includes/ical.php

<?php
if(!defined('WPINC')) {
	exit;
}

require_once(EL_PATH.'includes/options.php');
require_once(EL_PATH.'includes/events.php');

// This class handles iCal feed
class EL_ICal {
	private static $instance;
	private $options;
	private $events;

	public static function &get_instance() {
		// Create class instance if required
		if(!isset(self::$instance)) {
			self::$instance = new self();
		}

		// Return class instance
		return self::$instance;
	}

	private function __construct() {
		$this->options = EL_Options::get_instance();
		$this->events = EL_Events::get_instance();
		$this->init();
	}

	public function init() {
		// register feed properly with WordPress
		add_feed($this->get_feed_name(), array(&$this, 'print_ical'));
	}

	public function print_ical() {
		header('Content-Type: text/calendar; charset='.get_option('blog_charset'), true);
		$options = array(
			'date_filter' => $this->options->get('el_feed_ical_upcoming_only') ? 'upcoming' : null,
			'order' => array('startdate DESC', 'starttime DESC', 'enddate DESC')
		);

		$events = $this->events->get($options);

		// Print iCal
		$eol = "\r\n";
		echo
		'BEGIN:VCALENDAR'.$eol.
		'VERSION:2.0'.$eol.
		'PRODID:-//'.get_bloginfo('name').'//NONSGML v1.0//EN'.$eol.
		'CALSCALE:GREGORIAN'.$eol.
		'UID:'.md5(uniqid(mt_rand(), true)).'@'.get_bloginfo('name').$eol;

		if(!empty($events)) {
			foreach ($events as $event) {
				echo
					'BEGIN:VEVENT'.$eol.
					'UID:'.md5(uniqid(mt_rand(), true)).'@'.get_bloginfo('name').$eol.
					'DTSTART:'.mysql2date('Ymd', $event->startdate, false).get_gmt_from_date($event->starttime, '\THis\Z').$eol;
				if($event->enddate !== $event->startdate) {
					echo 'DTEND:'.mysql2date('Ymd', $event->enddate, false).$eol;
				}
				echo
					'DTSTAMP:'.date("Ymd\THis\Z").$eol.
					'LOCATION:'.$event->location.$eol.
					'SUMMARY:'.$this->sanitize_feed_text($event->title).$eol;
					if(!empty($event->content)) {
						echo
						'DESCRIPTION:'.$this->sanitize_feed_text(str_replace(array("\r", "\n"), ' ', $event->content)).$eol;
					}
				echo
					'END:VEVENT'.$eol;
			}
		}
		echo 'END:VCALENDAR';
	}

	public function update_ical_rewrite_status() {
		$feeds = array_keys((array)get_option('rewrite_rules'), 'index.php?&feed=$matches[1]');
		$feed_rewrite_status = 0 < count(preg_grep('@[(\|]'.$this->get_feed_name().'[\|)]@', $feeds));
		// if iCal is enabled but rewrite rules do not exist already, flush rewrite rules
		if('1' == $this->options->get('el_feed_enable_ical') && !$feed_rewrite_status) {
			// result: add eventlist ical to rewrite rules
			flush_rewrite_rules(false);
		}
		// if iCal is disabled but rewrite rules do exist already, flush rewrite rules also
		elseif('1' != $this->options->get('el_feed_enable_ical') && $feed_rewrite_status) {
			// result: remove eventlist ical from rewrite rules
			flush_rewrite_rules(false);
		}
	}

	private function sanitize_feed_text($text) {
		return htmlspecialchars($text, ENT_QUOTES, 'UTF-8');
	}

	private function get_feed_name() {
		return $this->options->get('el_feed_ical_name');
	}

	public function feed_url() {
		if(get_option('permalink_structure')) {
			$feed_link = get_bloginfo('url').'/feed/';
		}
		else {
			$feed_link = get_bloginfo('url').'/?feed=';
		}
		return $feed_link . $this->get_feed_name();
	}
}
?>