Google Calendar Event

event.google_calendar_import.php

<?php

	require_once EXTENSIONS . '/xmlimporter/extension.driver.php';
	require_once EXTENSIONS . '/google_calendar_api/lib/class.json_to_xml.php';
	require_once TOOLKIT . '/class.gateway.php';

	Class eventgoogle_calendar_import extends Event {

		const ROOTELEMENT = 'google-calendar-import';
		const GOOGLE_ENDPOINT = 'https://www.googleapis.com/calendar/v3/calendars/%s/events?fields=%s&key=%s';
		const GOOGLE_COLOURS_ENDPOINT = 'https://www.googleapis.com/calendar/v3/colors?fields=event&key=%s';

		public $eParamFILTERS = array(
			'admin-only',
			'xss-fail'
		);

		public static function about(){
			return array(
				'name' => 'Google Calendar: Import Events',
				'author' => array(
					'name' => 'Brendan Abbott',
					'website' => 'http://localhost/aitc.qld.edu.au',
					'email' => '[email protected]'),
				'version' => 'Symphony 2.2.5',
				'release-date' => '2012-02-14T11:46:32+00:00'
			);
		}

		public static function getSource(){
			return '20';
		}

		public static function documentation(){
			return 'Pulls in the latest events for the given Calendar ID (described by <code>$_GET[\'calendar-id\']</code>)';
		}

		public function load() {
			if(isset($_GET['calendar-id'])) {
				return $this->__trigger();
			}
		}

		protected function __trigger(){
			// Get the JSON from the Google Calendar API and convert to XML
			$return = new XMLElement(self::ROOTELEMENT);

			try {
				$ch = new Gateway;
				$url = sprintf(self::GOOGLE_ENDPOINT,
					$_GET['calendar-id'], // Calendar ID
					'items(description,end,id,start,summary,updated,colorId)', // Fields
					Symphony::Configuration()->get('app-key', 'google-calendar-api') // API KEY
				);

				$ch->init($url);
				$result = $ch->exec();
				$info = $ch->getInfoLast();

				if($info['http_code'] === 200) {
					// Get the colours
					$ch->init(sprintf(self::GOOGLE_COLOURS_ENDPOINT,
						Symphony::Configuration()->get('app-key', 'google-calendar-api') // API KEY
					));
					$colours = $ch->exec();

					// Replace the colorId with the actual Hex code
					$colours = json_decode($colours);
					$events = json_decode($result);
					foreach($events->items as $event) {
						$event->colorId = $colours->event->{$event->colorId}->background;

						// iCal standard adds 1 day for a range.
						// This code will - 1 second to make the range correct
						$event->start->date = date('Y-m-d H:i:s', strtotime($event->start->date));
						$event->end->date = date('Y-m-d H:i:s', strtotime($event->end->date . ' - 1 second'));
					}

					$result = json_encode($events);

					$data = Json_to_xml::convert($result, false);
					$return->setValue($data);
				}
				else {
					throw new Exception(sprintf(
						'Failed to reach %s, code returned %d',
						$_GET['calendar-id'],
						$info['http_code']
					));
				}
			}
			catch (Exception $ex) {
				$return->setAttribute('status', 'failed');
				$return->setValue("Import Failed :: " . $ex->getMessage());
			}

			return $return;
		}
	}