All entries for Thursday 04 May 2006

May 04, 2006

csv–to–ical in ruby

I've inheritted a list of SSL certificates that we maintain for various (about 30 odd) different servers. What's irksome about it is that I need to remember in advance to renew the certificates. The excel spreadsheet I've got isn't much good for that. Clearly, something that's calendar–based would be simpler. So, excel would give me a CSV easily enough, but how to get that into iCal / Evolution / google calendar / whatever ?

Simple. Watch:

require 'CSV'
require 'rubygems'
require_gem 'icalendar'

cal =

CSV::Reader.parse("65279certs.csv")) do |field|

cname = field[0]
serverType = field[2]
owner = field[1]
expiry = Date.strptime(field[10],"%d/%m/%Y")
certID = field[8]

reminder =
reminder.summary = cname +" Certificate expiry"
reminder.uid = certID
reminder.dtstart = expiry -14
reminder.dtend = expiry -14
reminder.description = "#{cname} (#{serverType}) expires #{expiry.to_s}\n#{owner}"
cal.add reminder

puts cal.to_ical

(please excuse the wonky indentation )

Then all I need to do is chuck the results on the web somewhere and not only can I subscribe to it, but so can anyone else who wants to know when their certificates expire.

Seems to me that that strikes the balance between a write–only perl one–liner, and a bazillion lines of java. Yay for ruby.

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