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require 'time'
require 'base64'
require 'ostruct'
require 'digest/sha2'
require 'hmac'
require 'hmac-sha2'
require 'mixlib/authentication'
require 'mixlib/authentication/digester'
module Mixlib
module Authentication
module SignedHeaderAuth
SIGNING_DESCRIPTION = 'version=1.0'
# This is a module meant to be mixed in but can be used standalone
# with the simple OpenStruct extended with the auth functions
class << self
def signing_object(args={ })
OpenStruct.new(args).extend SignedHeaderAuth
end
end
# Build the canonicalized request based on the method, other headers, etc.
# compute the signature from the request, using the looked-up user secret
# ====Parameters
# private_key<OpenSSL::PKey::RSA>:: user's RSA private key.
def sign(private_key)
digester = Mixlib::Authentication::Digester.new
@hashed_body = if self.file
digester.hash_file(self.file)
else
digester.hash_body(self.body)
end
signature = Base64.encode64(private_key.private_encrypt(canonicalize_request)).chomp.gsub!(/\n/,"\n\t")
header_hash = {
"X-Ops-Sign" => SIGNING_DESCRIPTION,
"X-Ops-Userid" => user_id,
"X-Ops-Timestamp" => canonical_time,
"X-Ops-Content-Hash" =>@hashed_body,
"Authorization" => signature,
}
Mixlib::Authentication::Log.debug "Header hash: #{header_hash.inspect}"
header_hash
end
# Build the canonicalized time based on utc & iso8601
#
# ====Parameters
#
def canonical_time
Time.parse(timestamp).utc.iso8601
end
# Takes HTTP request method & headers and creates a canonical form
# to create the signature
#
# ====Parameters
#
#
def canonicalize_request
"Method:#{http_method.to_s.upcase}\nX-Ops-Content-Hash:#{@hashed_body}\nX-Ops-Timestamp:#{canonical_time}\nX-Ops-UserId:#{user_id}"
end
# Parses signature version information, algorithm used, etc.
#
# ====Parameters
#
def parse_signing_description
parts = @signing_description.strip.split(";").inject({ }) do |memo, part|
field_name, field_value = part.split("=")
memo[field_name.to_sym] = field_value.strip
memo
end
Mixlib::Authentication::Log.debug "Parsed signing description: #{parts.inspect}"
end
private :canonical_time, :canonicalize_request, :parse_signing_description
end
end
end
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