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# Copyright 2015 Google, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License 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.
require "googleauth/compute_engine"
require "googleauth/default_credentials"
module Google
# Module Auth provides classes that provide Google-specific authorization
# used to access Google APIs.
module Auth
NOT_FOUND_ERROR = <<~ERROR_MESSAGE.freeze
Could not load the default credentials. Browse to
https://developers.google.com/accounts/docs/application-default-credentials
for more information
ERROR_MESSAGE
module_function
# Obtains the default credentials implementation to use in this
# environment.
#
# Use this to obtain the Application Default Credentials for accessing
# Google APIs. Application Default Credentials are described in detail
# at https://cloud.google.com/docs/authentication/production.
#
# If supplied, scope is used to create the credentials instance, when it can
# be applied. E.g, on google compute engine and for user credentials the
# scope is ignored.
#
# @param scope [string|array|nil] the scope(s) to access
# @param options [Hash] Connection options. These may be used to configure
# the `Faraday::Connection` used for outgoing HTTP requests. For
# example, if a connection proxy must be used in the current network,
# you may provide a connection with with the needed proxy options.
# The following keys are recognized:
# * `:default_connection` The connection object to use for token
# refresh requests.
# * `:connection_builder` A `Proc` that creates and returns a
# connection to use for token refresh requests.
# * `:connection` The connection to use to determine whether GCE
# metadata credentials are available.
def get_application_default scope = nil, options = {}
creds = DefaultCredentials.from_env(scope, options) ||
DefaultCredentials.from_well_known_path(scope, options) ||
DefaultCredentials.from_system_default_path(scope, options)
return creds unless creds.nil?
unless GCECredentials.on_gce? options
# Clear cache of the result of GCECredentials.on_gce?
GCECredentials.unmemoize_all
raise NOT_FOUND_ERROR
end
GCECredentials.new scope: scope
end
end
end
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