gcalsync.rb

require 'rubygems'
require 'webrick'
require 'webrick/httpservlet/webdavhandler'
require 'icalendar'
require 'googlecalendar'

class WEBrick::HTTPServlet::WebDAVHandler
  def do_PUT(req,resp)
    c = File.new(req.path.delete('/$'), 'w+') # Open / create the file iCal has given us  {File::RDWR|File::CREAT}
    previous_file = ''
    eachline = c.each {|l| previous_file << l} # Read file contents into 'previous_file'
    puts req.body
  end
end

class WEBrick::HTTPServlet::WebDAVHandler
  def do_PUT(req,resp)
    if req.raw_header.to_s =~ /text\/calendar/ # If iCal gives us something...

      c = File.new(req.path.delete('/$'), 'w+') # Open / create the file iCal has given us  {File::RDWR|File::CREAT}
      previous_file = ''
      eachline = c.each {|l| previous_file << l} # Read file contents into 'previous_file'

      if previous_file != req.body # If the new PUT body differs from the last saved version...
        puts 'Calendar is different.'
        c.puts req.body
        c.close
        puts req.body
      else # Otherwise ignore
        puts 'Calendar is unchanged.'
      end
    end
  end
end

# Crank up the server
server = WEBrick::HTTPServer.new({:Port => 6453})
server.mount("/", WEBrick::HTTPServlet::WebDAVHandler, Dir.pwd)
trap(:INT){ server.shutdown } # Trap kill commands so we can shut down cleanly
server.start