google-auth-library-ruby/lib/googleauth.rb

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# 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 'multi_json'
require 'stringio'
require 'googleauth/credentials_loader'
require 'googleauth/compute_engine'
require 'googleauth/service_account'
require 'googleauth/user_refresh'
module Google
# Module Auth provides classes that provide Google-specific authorization
# used to access Google APIs.
module Auth
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NOT_FOUND_ERROR = <<END
Could not load the default credentials. Browse to
https://developers.google.com/accounts/docs/application-default-credentials
for more information
END
# DefaultCredentials is used to preload the credentials file, to determine
# which type of credentials should be loaded.
class DefaultCredentials
extend CredentialsLoader
# override CredentialsLoader#make_creds to use the class determined by
# loading the json.
def self.make_creds(options = {})
json_key_io, scope = options.values_at(:json_key_io, :scope)
if json_key_io
json_key, clz = determine_creds_class(json_key_io)
clz.new(json_key_io: StringIO.new(MultiJson.dump(json_key)),
scope: scope)
else
clz = read_creds
clz.new(scope: scope)
end
end
def self.read_creds
env_var = CredentialsLoader::ACCOUNT_TYPE_VAR
type = ENV[env_var]
fail "#{ACCOUNT_TYPE_VAR} is undefined in env" unless type
case type
when 'service_account'
ServiceAccountCredentials
when 'authorized_user'
UserRefreshCredentials
else
fail "credentials type '#{type}' is not supported"
end
end
# Reads the input json and determines which creds class to use.
def self.determine_creds_class(json_key_io)
json_key = MultiJson.load(json_key_io.read)
key = 'type'
fail "the json is missing the '#{key}' field" unless json_key.key?(key)
type = json_key[key]
case type
when 'service_account'
[json_key, ServiceAccountCredentials]
when 'authorized_user'
[json_key, UserRefreshCredentials]
else
fail "credentials type '#{type}' is not supported"
end
end
end
# 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 http://goo.gl/IUuyuX.
#
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# 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.
#
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# @param scope [string|array|nil] the scope(s) to access
# @param options [hash] allows override of the connection being used
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def get_application_default(scope = nil, options = {})
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creds = DefaultCredentials.from_env(scope) ||
DefaultCredentials.from_well_known_path(scope)
return creds unless creds.nil?
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fail NOT_FOUND_ERROR unless GCECredentials.on_gce?(options)
GCECredentials.new
end
module_function :get_application_default
end
end