Cal-Funnel

Merge multiple iCalendar feeds into one and serve the result over HTTP. Built with mergecal and designed to run behind Traefik.

Quick start

1. Copy the environment template:

   cp .env.example .env
   

2. Edit .env and set your calendar URLs and Traefik host.

3. Start behind Traefik (requires external proxy network):

   docker compose up -d
   

4. Subscribe your calendar client to:

   https://<TRAEFIK_HOST>/calendar.ics
   

Local testing (without Traefik)

Create docker-compose.override.yml (gitignored) with a port mapping:

services:
  cal-funnel:
    ports:
      - "8080:8080"

Then run:

docker compose up -d
curl http://localhost:8080/health
curl http://localhost:8080/calendar.ics

Configuration

Variable	Default	Description
CALENDAR_URLS	(required)	Comma-separated iCal feed URLs
FETCH_INTERVAL_SECONDS	900	How often feeds are re-fetched
PORT	8080	HTTP listen port
CALENDAR_PATH	/calendar.ics	Path served to calendar clients
HTTP_TIMEOUT_SECONDS	30	Per-feed fetch timeout
PRODID	(optional)	RFC5545 PRODID for merged calendar
TRAEFIK_HOST	(compose only)	Hostname for Traefik routing
TRAEFIK_CERT_RESOLVER	(compose only)	Traefik cert resolver name

Endpoints

Path	Description
/calendar.ics	Merged iCalendar feed
/health	Health check (200 when ready)
/	Short HTML page with subscription link

Build image

docker build -t cal-funnel:latest .

License note

mergecal is licensed under GPL-3.0. This project uses it as a self-hosted calendar merge tool.