#!/usr/bin/env ruby

# Author:: Andrew Pennebaker
#
# KOPIMI
#
# == Synopsis
#
# yellosync: sets the time without using NTP

require "open-uri"

require "openssl"

# Fixes certificate verification
# http://situated.wordpress.com/2008/06/10/opensslsslsslerror-certificate-verify-failed-open-uri/
module OpenSSL
	module SSL
		remove_const :VERIFY_PEER
	end
end

OpenSSL::SSL::VERIFY_PEER=OpenSSL::SSL::VERIFY_NONE

require "time"

URL="https://time.yellosoft.us/"

def get_platform
	if RUBY_PLATFORM.include?("mswin")
		return :windows
	elsif RUBY_PLATFORM.include?("linux")
		return :linux
	elsif RUBY_PLATFORM.include?("bsd")
		return :unix
	elsif RUBY_PLATFORM.include?("darwin")
		return :macosx
	end
end

def main
	platform=get_platform

	puts "Requires a privileged environment"

	# gksudo Provides graphical authentication for Linux.
	# Applescript has graphical authentication for Mac OS X.
	# sudo, su provide terminal authentication for Unix, Linux, Mac OS X.
	# Windows has 'runas,' which sucks.
	#
	# Result: This script must be run inside a privileged environment.
	#    It's just too cumbersome to automate the authorization request.

	if platform==:linux or platform==:unix or platform==:macosx
		puts "Run using \'sudo\' or \'su\'"
	elsif platform==:windows
		puts "Run in a Command Prompt as administrator"
	end

	local_time=Time.now
	begin
		data=open(URL).read

		local_time=Time.parse(data).localtime
	rescue Timeout::Error
		puts "Cannot access #{URL}"
	rescue
		puts "Cannot access #{URL}"
	else
		# Windows
		if RUBY_PLATFORM.include?("mswin")
			command=format("time %02d:%02d", local_time.hour, local_time.min)
		# Linux
		elsif RUBY_PLATFORM.include?("linux")
			command=format("date -us \"%s\"", data)
		# Unix and Mac OS X
		elsif RUBY_PLATFORM.include?("bsd") or RUBY_PLATFORM.include?("darwin")
			command="date "+local_time.strftime("%m%d%H%M%Y.%S")
		end

		system(command)
	end
end

if __FILE__==$0
	begin
		main
	rescue Interrupt=>e
		nil
	end
end