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Calendar

GitHub

A little service that fetches iCalendar files from the "Wise Time Table".

Why?

The "Wise Time Table" serves the iCalendar files in an disingenuous way. They open a new page, redirect to a different URL and return the content as application/octet-stream, so the calendar cannot be consumed by other applications (only imported).

Solution

This service downloads the iCalendar file on request and serves it as text/plain.

Usage

The service is live at http://calendar.rwx.si (this link redirects here). You can request the calendar file by calling the calendar endpoint. It accepts a parameter filterId, which you can get by navigating to the timetable website, selecting the options you want and then clicking the little book icon at the upper left corner. You will get a permanent link, then you just need to copy the filterId part.

For example:

http://calendar.rwx.si/calendar?filterId=0;1;0;0;

This URL can be added to Google Calendar, Tunderbird, etc.

Deployment

If you are deploying on NixOS you can refer to the configuration that is used on our server, link. Otherwise you can use the following configuration files:

Service

/etc/systemd/system/calendar.service

[Unit]
Description=calendar
Requires=network-online.target
After=network-online.target

[Service]
Type=simple
ExecStart=/usr/bin/node /opt/calendar/calendar.js
User=calendar
Restart=always
Environment=NODE_ENV=production
Environment=PORT=8080
Environment=HOST=localhost
Environment=BROWSER_PATH=/usr/bin/chromium

[Install]
WantedBy=multi-user.target

Namespace cloning

/etc/sysctl.d/50-namespace-cloning.conf

kernel.unprivileged_userns_clone=1

Notes

The following changes needed to be made to be able to deploy on NixOS, you might want to revert them:

  • puppeteer-core was used instead of puppeteer. The difference is that the first is used in combination with the system version of chromium, thus you need to make sure the versions are compatible.
  • The access log is written to stdout

It doesn't work anymore?

Open an issue or shoot me an email!

License

ISC