class Google::Auth::ClientId

def self.from_file file
  raise "File can not be nil." if file.nil?
  File.open file.to_s do |f|
    json = f.read
    config = MultiJson.load json
    from_hash config
  end
end

def self.from_hash config
  raise "Hash can not be nil." if config.nil?
  raw_detail = config[INSTALLED_APP] || config[WEB_APP]
  raise MISSING_TOP_LEVEL_ELEMENT_ERROR if raw_detail.nil?
  ClientId.new raw_detail[CLIENT_ID], raw_detail[CLIENT_SECRET]
end

def initialize id, secret
  raise "Client id can not be nil" if id.nil?
  raise "Client secret can not be nil" if secret.nil?
  @id = id
  @secret = secret
end