# Google Auth Library for Ruby
Homepage
http://www.github.com/googleapis/google-auth-library-ruby
Authors
Tim Emiola
Copyright
Copyright © 2015 Google, Inc.
License
Apache 2.0
[![Gem Version](https://badge.fury.io/rb/googleauth.svg)](http://badge.fury.io/rb/googleauth) ## 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: ```bash $ gem install googleauth ``` ## Example Usage ```ruby 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][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](https://developers.google.com/identity/) ### Example (Web) ```ruby 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) ```ruby 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 => '/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) ```ruby 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! ``` ### Example (Environment Variables) ```bash export GOOGLE_ACCOUNT_TYPE=service_account export GOOGLE_CLIENT_ID=000000000000000000000 export GOOGLE_CLIENT_EMAIL=xxxx@xxxx.iam.gserviceaccount.com export GOOGLE_PRIVATE_KEY="-----BEGIN PRIVATE KEY-----\n...\n-----END PRIVATE KEY-----\n" ``` ```ruby require 'googleauth' require 'google/apis/drive_v3' Drive = ::Google::Apis::DriveV3 drive = Drive::DriveService.new # Auths with ENV vars: # "GOOGLE_CLIENT_ID", # "GOOGLE_CLIENT_EMAIL", # "GOOGLE_ACCOUNT_TYPE", # "GOOGLE_PRIVATE_KEY" auth = ::Google::Auth::ServiceAccountCredentials .make_creds(scope: 'https://www.googleapis.com/auth/drive') drive.authorization = auth list_files = drive.list_files() ``` ### 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](https://googleapis.dev/ruby/googleauth/latest/Google/Auth/TokenStore.html) for additional details. ## Supported Ruby Versions This library requires Ruby 2.4 or later. In general, this library supports Ruby versions that are considered current and supported by Ruby Core (that is, Ruby versions that are either in normal maintenance or in security maintenance). See https://www.ruby-lang.org/en/downloads/branches/ for further details. ## License This library is licensed under Apache 2.0. Full license text is available in [COPYING][copying]. ## Contributing See [CONTRIBUTING][contributing]. ## Support Please [report bugs at the project on Github](https://github.com/google/google-auth-library-ruby/issues). Don't hesitate to [ask questions](http://stackoverflow.com/questions/tagged/google-auth-library-ruby) about the client or APIs on [StackOverflow](http://stackoverflow.com). [application default credentials]: https://developers.google.com/accounts/docs/application-default-credentials [contributing]: https://github.com/googleapis/google-auth-library-ruby/tree/master/.github/CONTRIBUTING.md [copying]: https://github.com/googleapis/google-auth-library-ruby/tree/master/COPYING