Google Auth Library for Ruby

Homepage: http://www.github.com/google/google-auth-library-ruby
Authors: Tim Emiola
Copyright: Copyright © 2015 Google, Inc.
License: Apache 2.0

Description

This is Google’s officially supported ruby client library for using OAuth 2.0
authorization and authentication with Google APIs.

Alpha

This library is in Alpha. We will make an effort to support the library, but
we reserve the right to make incompatible changes when necessary.

Install

Be sure https://rubygems.org/ is in your gem sources.

For normal client usage, this is sufficient:

$ gem install googleauth

Example Usage

require 'googleauth'

# Get the environment configured authorization
scopes =  ['https://www.googleapis.com/auth/cloud-platform',
           'https://www.googleapis.com/auth/compute']
authorization = Google::Auth.get_application_default(scopes)

# Add the the access token obtained using the authorization to a hash, e.g
# headers.
some_headers = {}
authorization.apply(some_headers)

Application Default Credentials

This library provides an implementation of
application default credentials for Ruby.

The Application Default Credentials provide a simple way to get authorization
credentials for use in calling Google APIs.

They are best suited for cases when the call needs to have the same identity
and authorization level for the application independent of the user. This is
the recommended approach to authorize calls to Cloud APIs, particularly when
you’re building an application that uses Google Compute Engine.

User Credentials

The library also provides support for requesting and storing user
credentials (3-Legged OAuth2.) Two implementations are currently available,
a generic authorizer useful for command line apps or custom integrations as
well as a web variant tailored toward Rack-based applications.

The authorizers are intended for authorization use cases. For sign-on,
see Google Identity Platform

Example (Web)

require 'googleauth'
require 'googleauth/web_user_authorizer'
require 'googleauth/stores/redis_token_store'
require 'redis'

client_id = Google::Auth::ClientId.from_file('/path/to/client_secrets.json')
scope = ['https://www.googleapis.com/auth/drive']
token_store = Google::Auth::Stores::RedisTokenStore.new(redis: Redis.new)
authorizer = Google::Auth::WebUserAuthorizer.new(
  client_id, scope, token_store, '/oauth2callback')


get('/authorize') do
  # NOTE: Assumes the user is already authenticated to the app
  user_id = request.session['user_id']
  credentials = authorizer.get_credentials(user_id, request)
  if credentials.nil?
    redirect authorizer.get_authorization_url(login_hint: user_id, request: request)
  end
  # Credentials are valid, can call APIs
  # ...
end

get('/oauth2callback') do
  target_url = Google::Auth::WebUserAuthorizer.handle_auth_callback_deferred(
    request)
  redirect target_url
end

Example (Command Line)

require 'googleauth'
require 'googleauth/stores/file_token_store'

OOB_URI = 'urn:ietf:wg:oauth:2.0:oob'

scope = 'https://www.googleapis.com/auth/drive'
client_id = Google::Auth::ClientId.from_file('/path/to/client_secrets.json')
token_store = Google::Auth::Stores::FileTokenStore.new(
  :file =&gt; '/path/to/tokens.yaml')
authorizer = Google::Auth::UserAuthorizer.new(client_id, scope, token_store)

credentials = authorizer.get_credentials(user_id)
if credentials.nil?
  url = authorizer.get_authorization_url(base_url: OOB_URI )
  puts "Open #{url} in your browser and enter the resulting code:"
  code = gets
  credentials = authorizer.get_and_store_credentials_from_code(
    user_id: user_id, code: code, base_url: OOB_URI)
end

# OK to use credentials

Example (Service Account)

scope = 'https://www.googleapis.com/auth/androidpublisher'

authorizer = Google::Auth::ServiceAccountCredentials.make_creds(
  json_key_io: File.open('/path/to/service_account_json_key.json'),
  scope: scope)

authorizer.fetch_access_token!

Storage

Authorizers require a storage instance to manage long term persistence of
access and refresh tokens. Two storage implementations are included:

Google::Auth::Stores::FileTokenStore
Google::Auth::Stores::RedisTokenStore

Custom storage implementations can also be used. See
token_store.rb for additional details.

License

This library is licensed under Apache 2.0. Full license text is
available in COPYING.

Contributing

See CONTRIBUTING.

Support

Please
report bugs at the project on Github. Don’t
hesitate to
ask questions
about the client or APIs on StackOverflow.

Modules

Classes