class Google::Auth::DefaultCredentials

which type of credentials should be loaded.
DefaultCredentials is used to preload the credentials file, to determine

def self.determine_creds_class json_key_io = nil

Raises:
  • (Google::Auth::InitializationError) - If the JSON is missing the type field or has an unsupported type,

Returns:
  • (Array(Hash, Class)) - The JSON key (or nil if from environment) and the credential class to use

Parameters:
  • json_key_io (IO, nil) -- An optional IO object containing the JSON key. 
def self.determine_creds_class json_key_io = nil
  if json_key_io
    json_key = MultiJson.load json_key_io.read
    key = "type"
    raise InitializationError, "the json is missing the '#{key}' field" unless json_key.key? key
    type = json_key[key]
  else
    env_var = CredentialsLoader::ACCOUNT_TYPE_VAR
    type = ENV[env_var]
    raise InitializationError, "#{env_var} is undefined in env" unless type
    json_key = nil
  end
  clz = case type
        when ServiceAccountCredentials::CREDENTIAL_TYPE_NAME
          ServiceAccountCredentials
        when UserRefreshCredentials::CREDENTIAL_TYPE_NAME
          UserRefreshCredentials
        when ExternalAccount::Credentials::CREDENTIAL_TYPE_NAME
          ExternalAccount::Credentials
        when ImpersonatedServiceAccountCredentials::CREDENTIAL_TYPE_NAME
          ImpersonatedServiceAccountCredentials
        else
          raise InitializationError, "credentials type '#{type}' is not supported"
        end
  [json_key, clz]
end

def self.make_creds options = {}

Raises:
  • (Google::Auth::InitializationError) - If the credentials cannot be determined

Returns:
  • (Google::Auth::Credentials) - The credentials instance

Parameters:
  • options (Hash) -- Options for creating the credentials

Other tags:
    See: Google::Auth::ServiceAccountCredentials.make_creds -

Deprecated:
  • This method is deprecated and will be removed in a future version.
def self.make_creds options = {}
  json_key_io = options[:json_key_io]
  json_key, clz = determine_creds_class json_key_io
  if json_key
    io = StringIO.new MultiJson.dump(json_key)
    clz.make_creds options.merge(json_key_io: io)
  else
    clz.make_creds options
  end
end