Class: Distelli::RequestSigner

Inherits:
Object
  • Object
show all
Defined in:
lib/distelli/clientframework.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ RequestSigner

Returns a new instance of RequestSigner.



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# File 'lib/distelli/clientframework.rb', line 27

def initialize()
  @logger = Logging::Logger['RequestSigner']
end

Instance Method Details

#get_signature(secret_key, request_info) ⇒ Object 



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# File 'lib/distelli/clientframework.rb', line 91

def get_signature(secret_key, request_info)
  string_to_sign = get_string_to_sign(request_info)
  @logger.debug("StringToSign:\n"+string_to_sign)
  return hmacsha(secret_key, string_to_sign)
end

#get_string_to_sign(request_info) ⇒ Object 



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# File 'lib/distelli/clientframework.rb', line 31

def get_string_to_sign(request_info)
  string_to_sign = Array.new
  string_to_sign.push(request_info.http_method)
  if request_info.contains_header(ServiceConstants::CONTENT_MD5_HEADER)
    string_to_sign.push(request_info.headers[ServiceConstants::CONTENT_MD5_HEADER])
  else
    string_to_sign.push("")
  end

  if request_info.contains_header(ServiceConstants::CONTENT_TYPE_HEADER)
    string_to_sign.push(request_info.headers[ServiceConstants::CONTENT_TYPE_HEADER])
  else
    string_to_sign.push("")
  end

  if request_info.contains_header(ServiceConstants::DATE_HEADER)
    string_to_sign.push(request_info.headers[ServiceConstants::DATE_HEADER])
  else
    string_to_sign.push("")
  end

  sorted_headers = Array.new
  request_info.headers.each do |header|
    if header[0].to_s().downcase().start_with?("x-dstli")
      sorted_headers.push(header[0])
    end
  end

  sorted_headers.sort!()
  sorted_headers.each do |header|
    string_to_sign.push(header.downcase()+":"+request_info.headers[header.to_s])
  end

  # Canonicalize the resource
  if request_info.resource == nil
    string_to_sign.push("")
  else
    string_to_sign.push(request_info.resource)
  end

  sorted_params = Array.new
  if request_info.query_params != nil
    request_info.query_params.each_pair do |param, values|
      if values == nil or values.length() == 0
        next
      end
      values.sort!()
      query_param_list = Array.new
      values.each do |value|
        query_param_list.push(value.to_s)
      end
      sorted_params.push(param+"="+query_param_list.join(','))
    end
  end

  sorted_params.sort!()
  string_to_sign.push(sorted_params.join('&'))
  return string_to_sign.join("\n")
end

#hmacsha(secret_key, string_to_sign) ⇒ Object 



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# File 'lib/distelli/clientframework.rb', line 97

def hmacsha(secret_key, string_to_sign)
  digest = OpenSSL::Digest::Digest.new("sha256")
  hmac = OpenSSL::HMAC.digest(digest, secret_key, string_to_sign)
  return Base64.encode64(hmac)
end