Add support for ics.acmcsuf.com

This commit adds support for parsing ICS calendars using the ICal
standard format in addition to the existing Google Calendar API.

The new commit also contains a hard-coded array of ICS calendar links,
currently only containing ics.acmcsuf.com. In the future, more links may
be added to this.

A hard-coded array was chosen over an environment variable because
environment variables cannot express arrays as easily. That said, if
there are any private calendars, then they can be used as such:

    const KnownCalendars = [
      "public1.ics",
      "public2.ics",
      SECRET_ICS_X,
      SECRET_ICS_Y,
    ]

In the future, if ics.acmcsuf.com is proven to work well enough, the
Google Calendar API could even be completely phased out.

NOTE: It is worth pointing out that this ICS code currently *does not
support recurring events*. This is because ics.acmcsuf.com doesn't do
recurring events.

package.json

@@ -69,6 +69,7 @@
     "@js-temporal/polyfill": "^0.4.4",
     "cropperjs": "^1.5.13",
     "html-to-text": "^9.0.5",
+    "node-ical": "^0.16.1",
     "pomo": "github:ethanthatonekid/pomo#npm",
     "qrcode": "^1.5.3",
     "rrule": "^2.7.2",

src/lib/server/events/data/known-ics.ts

@@ -0,0 +1,2 @@
+const knownICS = ['https://ics.acmcsuf.com/guilds/710225099923521558/events.ics'];
+export default knownICS;

src/lib/server/events/gcal.test.ts

@@ -7,7 +7,7 @@ import CLUB_EVENTS from './data/club-events.json?raw';
 
 test('transforms GCalEvent list to ClubEvent list', async () => {
   const input = JSON.parse(GCAL_EVENTS) as GCalEvent[];
-  const actual = fromGCal(input);
+  const actual = fromGCal(input, 'America/Los_Angeles');
 
   // To generate 'src/lib/server/events/data/club-events.json', uncomment the
   // following lines of code then run 'npm t' (and 'npm run all'):

src/lib/server/events/gcal.ts

@@ -4,9 +4,9 @@ import { calendar } from '@googleapis/calendar';
 import { makeClubEvent } from './event';
 import { GCAL_API_KEY, GCAL_ID } from '$lib/server/env';
 
-export function fromGCal(events: GCalEvent[]): ClubEvent[] {
+export function fromGCal(events: GCalEvent[], timezone: string): ClubEvent[] {
   const sortedEvents: ClubEvent[] = [];
-  const refDate = Temporal.Now.zonedDateTimeISO('America/Los_Angeles');
+  const refDate = Temporal.Now.zonedDateTimeISO(timezone);
 
   for (const event of events) {
     const clubEvent = makeClubEvent(event, refDate);