Added possibility to export the calendar in iCal format (closes #141)

controllers/CalendarApiController.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace Grocy\Controllers;
+
+use \Grocy\Services\CalendarService;
+use \Grocy\Services\ApiKeyService;
+
+class CalendarApiController extends BaseApiController
+{
+	public function __construct(\Slim\Container $container)
+	{
+		parent::__construct($container);
+		$this->CalendarService = new CalendarService();
+		$this->ApiKeyService = new ApiKeyService();
+	}
+
+	protected $CalendarService;
+	protected $ApiKeyService;
+
+	public function Ical(\Slim\Http\Request $request, \Slim\Http\Response $response, array $args)
+	{
+		try
+		{
+			$vCalendar = new \Eluceo\iCal\Component\Calendar('grocy');
+
+			$events = $this->CalendarService->GetEvents();
+			foreach($events as $event)
+			{
+				$vEvent = new \Eluceo\iCal\Component\Event();
+				$vEvent->setDtStart(new \DateTime($event['start']))
+					->setDtEnd(new \DateTime($event['start']))
+					->setSummary($event['title'])
+					->setNoTime($event['date_format'] === 'date')
+					->setUseUtc(false);
+				
+				$vCalendar->addComponent($vEvent);
+			}
+
+			$response->write($vCalendar->render());
+			$response = $response->withHeader('Content-Type', 'text/calendar; charset=utf-8');
+			return $response->withHeader('Content-Disposition', 'attachment; filename="grocy.ics"');
+		}
+		catch (\Exception $ex)
+		{
+			return $this->GenericErrorResponse($response, $ex->getMessage());
+		}
+	}
+
+	public function IcalSharingLink(\Slim\Http\Request $request, \Slim\Http\Response $response, array $args)
+	{
+		try
+		{
+			return $this->ApiResponse(array(
+				'url' => $this->AppContainer->UrlManager->ConstructUrl('/api/calendar/ical?secret=' . $this->ApiKeyService->GetOrCreateApiKey(ApiKeyService::API_KEY_TYPE_SPECIAL_PURPOSE_CALENDAR_ICAL))
+			));
+		}
+		catch (\Exception $ex)
+		{
+			return $this->GenericErrorResponse($response, $ex->getMessage());
+		}
+	}
+}