amazeprice

require 'vacuum'

ACCESS_IDENTIFIER = ''
SECRET_IDENTIFIER = ''

def aws_escape(s)
  s.gsub(/[^A-Za-z0-9_.~-]/) { |c| '%' + c.ord.to_s(16).upcase }
end

def signing_logic(params)
  amazon_endpoint= "webservices.amazon.in"
  amazon_path = "/onca/xml"

  signing_params = {
    :AWSAccessKeyId => ACCESS_IDENTIFIER,
    :Timestamp => Time.now.gmtime.iso8601
  }
  params.merge!(signing_params)
  canonical_querystring = params.sort.collect do |key, value|
    [aws_escape(key.to_s), aws_escape(value.to_s)].join('=')
  end.join('&')
  string_to_sign = "GET\n#{amazon_endpoint}\n#{amazon_path}\n#{canonical_querystring}"

  hmac = HMAC::SHA256.new(SECRET_IDENTIFIER)
  hmac.update(string_to_sign)
  signature = Base64.encode64(hmac.digest).chomp

  params[:Signature] = signature
  querystring = params.sort.collect do |key, value|
    [aws_escape(key.to_s), aws_escape(value.to_s)].join('=')
  end.join('&')

  signed_url = URI("http://#{amazon_endpoint}#{amazon_path}?#{querystring}")
end


request = Vacuum::Request.new('US')

request.associate_tag = 'tag'


response = request.browse_node_lookup(
  query: {
    'BrowseNodeId' => 123
  }
)