This example calculates request MAC according to "HTTP Authentication: MAC Access Authentication (draft 00)

draft-ietf-oauth-v2-http-mac-00-example.rb

# author: Justas Janauskas, 
# Aug 5, 2012
#
# This example calculates request MAC according to "HTTP Authentication: MAC Access Authentication (draft 00)"
# example in section 1.2
#
# ref: http://tools.ietf.org/pdf/draft-ietf-oauth-v2-http-mac-00.pdf 

require 'base64'
require 'openssl'

normalized_request_string = [
	'264095:dj83hs9s',
  'GET',
  '/resource/1?b=1&a=2',
  'example.com',
  80,
  nil,
  nil,
  nil
].join("\n")

puts normalized_request_string
hmac = OpenSSL::HMAC.digest(
  OpenSSL::Digest::SHA1.new,
  '489dks293j39',
  normalized_request_string
)

mac = Base64.encode64(hmac).gsub(/\n/, '') 

puts "I get \"#{mac}\", example has \"SLDJd4mg43cjQfElUs3Qub4L6xE=\""

# output:
# I get "SLDJd4mg43cjQfElUs3Qub4L6xE=", example has "SLDJd4mg43cjQfElUs3Qub4L6xE="