# Copyright 2011-2012 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
#     http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.

module AWS
  module Core
    
    # Mixed into clients that use signature v2 authorization.
    # @private
    module AuthorizeV2

      def string_to_sign
        parts = [http_method,
                 host,
                 path,
                 params.sort.collect { |p| p.encoded }.join('&')]
        parts.join("\n")
      end

      def add_authorization! signer
        self.access_key_id = signer.access_key_id
        add_param('AWSAccessKeyId', access_key_id)
        add_param('SignatureVersion', '2')
        add_param('SignatureMethod', 'HmacSHA256')
        add_param('Signature', signer.sign(string_to_sign))
      end

    end
  end
end