87 lines
3.7 KiB
Ruby
87 lines
3.7 KiB
Ruby
# Copyright 2015, Google Inc.
|
|
# All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are
|
|
# met:
|
|
#
|
|
# * Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# * Redistributions in binary form must reproduce the above
|
|
# copyright notice, this list of conditions and the following disclaimer
|
|
# in the documentation and/or other materials provided with the
|
|
# distribution.
|
|
# * Neither the name of Google Inc. nor the names of its
|
|
# contributors may be used to endorse or promote products derived from
|
|
# this software without specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
require 'faraday'
|
|
require 'googleauth/signet'
|
|
require 'memoist'
|
|
|
|
module Google
|
|
# Module Auth provides classes that provide Google-specific authorization
|
|
# used to access Google APIs.
|
|
module Auth
|
|
# Extends Signet::OAuth2::Client so that the auth token is obtained from
|
|
# the GCE metadata server.
|
|
class GCECredentials < Signet::OAuth2::Client
|
|
# The IP Address is used in the URIs to speed up failures on non-GCE
|
|
# systems.
|
|
COMPUTE_AUTH_TOKEN_URI = 'http://169.254.169.254/computeMetadata/v1/'\
|
|
'instance/service-accounts/default/token'
|
|
COMPUTE_CHECK_URI = 'http://169.254.169.254'
|
|
|
|
class << self
|
|
extend Memoist
|
|
|
|
# Detect if this appear to be a GCE instance, by checking if metadata
|
|
# is available
|
|
def on_gce?(options = {})
|
|
c = options[:connection] || Faraday.default_connection
|
|
resp = c.get(COMPUTE_CHECK_URI) do |req|
|
|
# Comment from: oauth2client/client.py
|
|
#
|
|
# Note: the explicit `timeout` below is a workaround. The underlying
|
|
# issue is that resolving an unknown host on some networks will take
|
|
# 20-30 seconds; making this timeout short fixes the issue, but
|
|
# could lead to false negatives in the event that we are on GCE, but
|
|
# the metadata resolution was particularly slow. The latter case is
|
|
# "unlikely".
|
|
req.options.timeout = 0.1
|
|
end
|
|
return false unless resp.status == 200
|
|
return false unless resp.headers.key?('Metadata-Flavor')
|
|
return resp.headers['Metadata-Flavor'] == 'Google'
|
|
rescue Faraday::TimeoutError, Faraday::ConnectionFailed
|
|
return false
|
|
end
|
|
|
|
memoize :on_gce?
|
|
end
|
|
|
|
# Overrides the super class method to change how access tokens are
|
|
# fetched.
|
|
def fetch_access_token(options = {})
|
|
c = options[:connection] || Faraday.default_connection
|
|
c.headers = { 'Metadata-Flavor' => 'Google' }
|
|
resp = c.get(COMPUTE_AUTH_TOKEN_URI)
|
|
Signet::OAuth2.parse_credentials(resp.body,
|
|
resp.headers['content-type'])
|
|
end
|
|
end
|
|
end
|
|
end
|