A simple ICS events notifier by email

ics-notifier.conf.json

{
    "url": "http://an/ics/file/uri.ics",
    "mailfile": "/tmp/ics-notifier.email.txt",
    "subject": "Évènement",
    "tzone": "Europe/Paris",
    "mails": [
        "email1@example.com",
        "email2@example.com"
    ]
}

ics-notifier.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from ics import Calendar
from urllib2 import urlopen
import arrow
import subprocess
import codecs
import json


# simple mail sending function
def send_message(recipient, subject, mailbodyfile):
    try:
        command = "cat %s | mail -s '%s' '%s'" % (mailbodyfile, subject, recipient)
        process = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE)
    except Exception, error:
        print error


def main():
    # read config
    json_data=json.load(open('./ics-notifier.conf.json'))
    url = json_data["url"]
    mailfile = json_data["mailfile"]
    maildest = json_data["mails"]
    tzone = json_data["tzone"]
    subject = json_data["subject"]

    # init calendar
    c = Calendar(urlopen(url).read().decode('utf-8'))

    # limits
    today = arrow.now(tzone)
    tomorrow = today.replace(days=+1)

    # process events
    for event in c.events:
        if event.begin > arrow.now(tzone).replace(minutes=-50):
            event_delay = None

            # get events for each our delay
            if event.begin < arrow.now(tzone).replace(hours=+3):
                event_delay = "dans moins de 3 heures"
            if event.begin < arrow.now(tzone).replace(hours=+1):
                event_delay = "dans moins de 60 minutes"
            if event.begin < arrow.now(tzone):
                event_delay = "maintenant !"
            
            if event_delay:
                subject = u"%s %s" % (subject, event_delay)
                # init file
                mailbody = codecs.open(mailfile, "w", "utf-8")
                # fill mail
                mailbody.write(subject)
                mailbody.write(u"    %s\n" % event.name)
                mailbody.write(u"\nà %s\n" % event.begin.to('local'))
                mailbody.write(u"\n--------------\n")
                mailbody.write(event.description + u"\n")
                mailbody.close()

                # send alerts
                for user in maildest:
                    send_message(user, subject, mailfile)

main()