Add iCal converter

2022-12-24 17:44:28 +01:00
parent 96f04c6de4
commit b00a37eb17
4 changed files with 172 additions and 4 deletions
@@ -0,0 +1,132 @@
+import {Event} from './event.interface';
+
+export const convertToIcal = async (events: Event[]): Promise<string> => {
+	try {
+		let ical: iCalFile = {body: []};
+		generateHeaderInfo(ical);
+		generateFooterInfo(ical);
+		for (let event of events) {
+			addEventToFile(ical, event);
+		}
+
+		return serializeIcalFile(ical);
+	} catch (err) {
+		throw err;
+	}
+};
+
+const serializeIcalFile = (ical: iCalFile): string => {
+	let returnString = '';
+
+	returnString += ical.header;
+	for (let event of ical.body) {
+		returnString += serializeIcalEvent(event);
+	}
+	returnString += ical.footer;
+
+	return returnString;
+};
+
+const serializeIcalEvent = (icalevent: iCalEvent): string => {
+	let returnString = '';
+
+	returnString += icalevent.header;
+	returnString += 'UID:' + icalevent.uid;
+	returnString += 'DTSTAMP:' + icalevent.created;
+	returnString += 'ORGANIZER:' + icalevent.organizer;
+	returnString += 'DTSTART;TZID=Europe/Berlin:' + icalevent.start;
+	returnString += 'DTEND;TZID=Europe/Berlin:' + icalevent.end;
+	returnString += 'SUMMARY:' + icalevent.summary;
+	returnString += 'DESCRIPTION:' + icalevent.description;
+	returnString += 'LOCATION:' + icalevent.location;
+	returnString += 'URL:' + icalevent.url;
+	returnString += icalevent.footer;
+
+	return returnString;
+};
+
+
+const generateHeaderInfo = (ical: iCalFile) => {
+	ical.header = 'BEGIN:VCALENDAR\n' +
+		'VERSION:2.0\n' +
+		'PRODID:-//hacksw/handcal//NONSGML v1.0//EN\n' +
+		'CALSCALE:GREGORIAN\n' +
+		'BEGIN:VTIMEZONE\n' +
+		'TZID:Europe/Berlin\n' +
+		'LAST-MODIFIED:20201011T015911Z\n' +
+		'TZURL:http://tzurl.org/zoneinfo-outlook/Europe/Berlin\n' +
+		'X-LIC-LOCATION:Europe/Berlin\n' +
+		'BEGIN:DAYLIGHT\n' +
+		'TZNAME:CEST\n' +
+		'TZOFFSETFROM:+0100\n' +
+		'TZOFFSETTO:+0200\n' +
+		'DTSTART:19700329T020000\n' +
+		'RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU\n' +
+		'END:DAYLIGHT\n' +
+		'BEGIN:STANDARD\n' +
+		'TZNAME:CET\n' +
+		'TZOFFSETFROM:+0200\n' +
+		'TZOFFSETTO:+0100\n' +
+		'DTSTART:19701025T030000\n' +
+		'RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU\n' +
+		'END:STANDARD\n' +
+		'END:VTIMEZONE\n';
+};
+
+const generateFooterInfo = (ical: iCalFile) => {
+	ical.footer = 'END:VCALENDAR';
+};
+
+const addEventToFile = (ical: iCalFile, event: Event) => {
+	ical.body.push(createIcalEvent(event));
+};
+
+const createIcalEvent = (event: Event): iCalEvent => {
+	return {
+		header: 'BEGIN:VEVENT\n',
+		uid: event.uuid + '\n',
+		created: formatDate(event.created_date) + 'Z\n',
+		organizer: event.created_by + '\n',
+		start: formatDate(event.start_datetime) + '\n',
+		end: formatDate(event.end_datetime) + '\n',
+		summary: event.name + '\n',
+		description: event.description + '\n',
+		location: event.location + '\n',
+		url: event.url + '\n',
+		footer: 'END:VEVENT\n'
+	};
+};
+
+const formatDate = (date: Date): string => {
+	let returnString = '';
+
+	returnString += date.getFullYear();
+	returnString += (date.getMonth() + 1).toString().padStart(2, '0'); // +1 Because JS sucks
+	returnString += date.getDate().toString().padStart(2, '0');
+	returnString += 'T';
+	returnString += date.getHours().toString().padStart(2, '0');
+	returnString += date.getMinutes().toString().padStart(2, '0');
+	returnString += date.getSeconds().toString().padStart(2, '0');
+
+	return returnString;
+};
+
+export interface iCalFile {
+	header?: string;
+	body: iCalEvent[];
+	footer?: string;
+}
+
+export interface iCalEvent {
+	header: string;
+	uid: string;
+	created: string;
+	organizer: string;
+	start: string;
+	end: string;
+	summary: string;
+	description: string;
+	location: string;
+	url: string;
+	footer: string;
+}