By Plataformatec.
This README is also available in a friendly navigable format.
Devise is a flexible authentication solution for Rails based on Warden. It:
- Is Rack based;
- Is a complete MVC solution based on Rails engines;
- Allows you to have multiple models signed in at the same time;
- Is based on a modularity concept: use only what you really need.
It's composed of 10 modules:
- Database Authenticatable: encrypts and stores a password in the database to validate the authenticity of a user while signing in. The authentication can be done both through POST requests or HTTP Basic Authentication.
- Omniauthable: adds OmniAuth (https://github.com/intridea/omniauth) support.
- Confirmable: sends emails with confirmation instructions and verifies whether an account is already confirmed during sign in.
- Recoverable: resets the user password and sends reset instructions.
- Registerable: handles signing up users through a registration process, also allowing them to edit and destroy their account.
- Rememberable: manages generating and clearing a token for remembering the user from a saved cookie.
- Trackable: tracks sign in count, timestamps and IP address.
- Timeoutable: expires sessions that have not been active in a specified period of time.
- Validatable: provides validations of email and password. It's optional and can be customized, so you're able to define your own validations.
- Lockable: locks an account after a specified number of failed sign-in attempts. Can unlock via email or after a specified time period.
Devise is guaranteed to be thread-safe on YARV. Thread-safety support on JRuby is in progress.
Information
The Devise wiki
The Devise Wiki has lots of additional information about Devise including many "how-to" articles and answers to the most frequently asked questions. Please browse the Wiki after finishing this README:
https://github.com/plataformatec/devise/wiki
Bug reports
If you discover a problem with Devise, we would like to know about it. However, we ask that you please review these guidelines before submitting a bug report:
https://github.com/plataformatec/devise/wiki/Bug-reports
If you have discovered a security related bug, please do NOT use the GitHub issue tracker. Send an email to [email protected].
Mailing list
If you have any questions, comments, or concerns, please use the Google Group instead of the GitHub issue tracker:
https://groups.google.com/group/plataformatec-devise
RDocs
You can view the Devise documentation in RDoc format here:
http://rubydoc.info/github/plataformatec/devise/master/frames
If you need to use Devise with previous versions of Rails, you can always run "gem server" from the command line after you install the gem to access the old documentation.
Example applications
There are a few example applications available on GitHub that demonstrate various features of Devise with different versions of Rails. You can view them here:
https://github.com/plataformatec/devise/wiki/Example-Applications
Extensions
Our community has created a number of extensions that add functionality above and beyond what is included with Devise. You can view a list of available extensions and add your own here:
https://github.com/plataformatec/devise/wiki/Extensions
Contributing
We hope that you will consider contributing to Devise. Please read this short overview for some information about how to get started:
https://github.com/plataformatec/devise/wiki/Contributing
You will usually want to write tests for your changes. To run the test suite, go into Devise's top-level directory and run "bundle install" and "rake". For the tests to pass, you will need to have a MongoDB server (version 2.0 or newer) running on your system.
Starting with Rails?
If you are building your first Rails application, we recommend you do not use Devise. Devise requires a good understanding of the Rails Framework. In such cases, we advise you to start a simple authentication system from scratch. Today, we have three resources that should help you get started:
- Michael Hartl's online book: https://www.railstutorial.org/book/modeling_users
- Ryan Bates' Railscast: http://railscasts.com/episodes/250-authentication-from-scratch
- Codecademy's Ruby on Rails: Authentication and Authorization: http://www.codecademy.com/en/learn/rails-auth
Once you have solidified your understanding of Rails and authentication mechanisms, we assure you Devise will be very pleasant to work with. 😃
Getting started
Devise 3.0 works with Rails 3.2 onwards. You can add it to your Gemfile with:
gem 'devise'
Run the bundle command to install it.
After you install Devise and add it to your Gemfile, you need to run the generator:
rails generate devise:install
The generator will install an initializer which describes ALL of Devise's configuration options. It is imperative that you take a look at it. When you are done, you are ready to add Devise to any of your models using the generator:
rails generate devise MODEL
Replace MODEL with the class name used for the application’s users (it’s frequently User
but could also be Admin
). This will create a model (if one does not exist) and configure it with default Devise modules. The generator also configures your config/routes.rb
file to point to the Devise controller.
Next, check the MODEL for any additional configuration options you might want to add, such as confirmable or lockable. If you add an option, be sure to inspect the migration file (created by the generator if your ORM supports them) and uncomment the appropriate section. For example, if you add the confirmable option in the model, you'll need to uncomment the Confirmable section in the migration. Then run rake db:migrate
Next, you need to set up the default URL options for the Devise mailer in each environment. Here is a possible configuration for config/environments/development.rb
:
config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
You should restart your application after changing Devise's configuration options. Otherwise, you will run into strange errors, for example, users being unable to login and route helpers being undefined.
Controller filters and helpers
Devise will create some helpers to use inside your controllers and views. To set up a controller with user authentication, just add this before_action (assuming your devise model is 'User'):
before_action :authenticate_user!
If your devise model is something other than User, replace "_user" with "_yourmodel". The same logic applies to the instructions below.
To verify if a user is signed in, use the following helper:
user_signed_in?
For the current signed-in user, this helper is available:
current_user
You can access the session for this scope:
user_session
After signing in a user, confirming the account or updating the password, Devise will look for a scoped root path to redirect to. For instance, when using a :user
resource, the user_root_path
will be used if it exists; otherwise, the default root_path
will be used. This means that you need to set the root inside your routes:
root to: "home#index"
You can also override after_sign_in_path_for
and after_sign_out_path_for
to customize your redirect hooks.
Notice that if your Devise model is called Member
instead of User
, for example, then the helpers available are:
before_action :authenticate_member!
member_signed_in?
current_member
member_session
Configuring Models
The Devise method in your models also accepts some options to configure its modules. For example, you can choose the cost of the encryption algorithm with:
devise :database_authenticatable, :registerable, :confirmable, :recoverable, stretches: 20
Besides :stretches
, you can define :pepper
, :encryptor
, :confirm_within
, :remember_for
, :timeout_in
, :unlock_in
among other options. For more details, see the initializer file that was created when you invoked the "devise:install" generator described above. This file is usually located at /config/initializers/devise.rb
.
Strong Parameters
When you customize your own views, you may end up adding new attributes to forms. Rails 4 moved the parameter sanitization from the model to the controller, causing Devise to handle this concern at the controller as well.
There are just three actions in Devise that allows any set of parameters to be passed down to the model, therefore requiring sanitization. Their names and the permitted parameters by default are:
sign_in
(Devise::SessionsController#create
) - Permits only the authentication keys (likeemail
)sign_up
(Devise::RegistrationsController#create
) - Permits authentication keys pluspassword
andpassword_confirmation
account_update
(Devise::RegistrationsController#update
) - Permits authentication keys pluspassword
,password_confirmation
andcurrent_password
In case you want to permit additional parameters (the lazy way™), you can do so using a simple before filter in your ApplicationController
:
class ApplicationController < ActionController::Base
before_action :configure_permitted_parameters, if: :devise_controller?
protected
def configure_permitted_parameters
devise_parameter_sanitizer.for(:sign_up) << :username
end
end
The above works for any additional fields where the parameters are simple scalar types. If you have nested attributes (say you're using accepts_nested_attributes_for
), then you will need to tell devise about those nestings and types. Devise allows you to completely change Devise defaults or invoke custom behaviour by passing a block:
To permit simple scalar values for username and email, use this
def configure_permitted_parameters
devise_parameter_sanitizer.for(:sign_in) { |u| u.permit(:username, :email) }
end
If you have some checkboxes that express the roles a user may take on registration, the browser will send those selected checkboxes as an array. An array is not one of Strong Parameters' permitted scalars, so we need to configure Devise in the following way:
def configure_permitted_parameters
devise_parameter_sanitizer.for(:sign_up) { |u| u.permit({ roles: [] }, :email, :password, :password_confirmation) }
end
For the list of permitted scalars, and how to declare permitted keys in nested hashes and arrays, see
https://github.com/rails/strong_parameters#nested-parameters
If you have multiple Devise models, you may want to set up a different parameter sanitizer per model. In this case, we recommend inheriting from Devise::ParameterSanitizer
and adding your own logic:
class User::ParameterSanitizer < Devise::ParameterSanitizer
def sign_in
default_params.permit(:username, :email)
end
end
And then configure your controllers to use it:
class ApplicationController < ActionController::Base
protected
def devise_parameter_sanitizer
if resource_class == User
User::ParameterSanitizer.new(User, :user, params)
else
super # Use the default one
end
end
end
The example above overrides the permitted parameters for the user to be both :username
and :email
. The non-lazy way to configure parameters would be by defining the before filter above in a custom controller. We detail how to configure and customize controllers in some sections below.
Configuring views
We built Devise to help you quickly develop an application that uses authentication. However, we don't want to be in your way when you need to customize it.
Since Devise is an engine, all its views are packaged inside the gem. These views will help you get started, but after some time you may want to change them. If this is the case, you just need to invoke the following generator, and it will copy all views to your application:
rails generate devise:views
If you have more than one Devise model in your application (such as User
and Admin
), you will notice that Devise uses the same views for all models. Fortunately, Devise offers an easy way to customize views. All you need to do is set config.scoped_views = true
inside the config/initializers/devise.rb
file.
After doing so, you will be able to have views based on the role like users/sessions/new
and admins/sessions/new
. If no view is found within the scope, Devise will use the default view at devise/sessions/new
. You can also use the generator to generate scoped views:
rails generate devise:views users
If you would like to generate only a few sets of views, like the ones for the registerable
and confirmable
module,
you can pass a list of modules to the generator with the -v
flag.
rails generate devise:views -v registrations confirmations
Configuring controllers
If the customization at the views level is not enough, you can customize each controller by following these steps:
-
Create your custom controllers using the generator which requires a scope:
rails generate devise:controllers [scope]
If you specify
users
as the scope, controllers will be created inapp/controllers/users/
. And the sessions controller will look like this:class Users::SessionsController < Devise::SessionsController # GET /resource/sign_in # def new # super # end ... end
-
Tell the router to use this controller:
devise_for :users, controllers: { sessions: "users/sessions" }
-
Copy the views from
devise/sessions
tousers/sessions
. Since the controller was changed, it won't use the default views located indevise/sessions
. -
Finally, change or extend the desired controller actions.
You can completely override a controller action:
class Users::SessionsController < Devise::SessionsController def create # custom sign-in code end end
Or you can simply add new behaviour to it:
class Users::SessionsController < Devise::SessionsController def create super do |resource| BackgroundWorker.trigger(resource) end end end
This is useful for triggering background jobs or logging events during certain actions.
Remember that Devise uses flash messages to let users know if sign in was successful or unsuccessful. Devise expects your application to call flash[:notice]
and flash[:alert]
as appropriate. Do not print the entire flash hash, print only specific keys. In some circumstances, Devise adds a :timedout
key to the flash hash, which is not meant for display. Remove this key from the hash if you intend to print the entire hash.
Configuring routes
Devise also ships with default routes. If you need to customize them, you should probably be able to do it through the devise_for method. It accepts several options like :class_name, :path_prefix and so on, including the possibility to change path names for I18n:
devise_for :users, path: "auth", path_names: { sign_in: 'login', sign_out: 'logout', password: 'secret', confirmation: 'verification', unlock: 'unblock', registration: 'register', sign_up: 'cmon_let_me_in' }
Be sure to check devise_for
documentation for details.
If you have the need for more deep customization, for instance to also allow "/sign_in" besides "/users/sign_in", all you need to do is to create your routes normally and wrap them in a devise_scope
block in the router:
devise_scope :user do
get "sign_in", to: "devise/sessions#new"
end
This way, you tell Devise to use the scope :user
when "/sign_in" is accessed. Notice devise_scope
is also aliased as as
in your router.
I18n
Devise uses flash messages with I18n, in conjunction with the flash keys :notice and :alert. To customize your app, you can set up your locale file:
en:
devise:
sessions:
signed_in: 'Signed in successfully.'
You can also create distinct messages based on the resource you've configured using the singular name given in routes:
en:
devise:
sessions:
user:
signed_in: 'Welcome user, you are signed in.'
admin:
signed_in: 'Hello admin!'
The Devise mailer uses a similar pattern to create subject messages:
en:
devise:
mailer:
confirmation_instructions:
subject: 'Hello everybody!'
user_subject: 'Hello User! Please confirm your email'
reset_password_instructions:
subject: 'Reset instructions'
Take a look at our locale file to check all available messages. You may also be interested in one of the many translations that are available on our wiki:
https://github.com/plataformatec/devise/wiki/I18n
Caution: Devise Controllers inherit from ApplicationController. If your app uses multiple locales, you should be sure to set I18n.locale in ApplicationController.
Test helpers
Devise includes some test helpers for functional specs. In order to use them, you need to include Devise in your functional tests by adding the following to the bottom of your test/test_helper.rb
file:
class ActionController::TestCase
include Devise::TestHelpers
end
If you're using RSpec, you can put the following inside a file named spec/support/devise.rb
or in your spec/spec_helper.rb
(or spec/rails_helper.rb
if you are using rspec-rails):
RSpec.configure do |config|
config.include Devise::TestHelpers, type: :controller
end
Just be sure that this inclusion is made after the require 'rspec/rails'
directive.
Now you are ready to use the sign_in
and sign_out
methods. Such methods have the same signature as in controllers:
sign_in :user, @user # sign_in(scope, resource)
sign_in @user # sign_in(resource)
sign_out :user # sign_out(scope)
sign_out @user # sign_out(resource)
There are two things that are important to keep in mind:
-
These helpers are not going to work for integration tests driven by Capybara or Webrat. They are meant to be used with functional tests only. Instead, fill in the form or explicitly set the user in session;
-
If you are testing Devise internal controllers or a controller that inherits from Devise's, you need to tell Devise which mapping should be used before a request. This is necessary because Devise gets this information from the router, but since functional tests do not pass through the router, it needs to be stated explicitly. For example, if you are testing the user scope, simply use:
@request.env["devise.mapping"] = Devise.mappings[:user] get :new
You can read more about testing your Rails 3 - Rails 4 controllers with RSpec in the wiki:
OmniAuth
Devise comes with OmniAuth support out of the box to authenticate with other providers. To use it, simply specify your OmniAuth configuration in config/initializers/devise.rb
:
config.omniauth :github, 'APP_ID', 'APP_SECRET', scope: 'user,public_repo'
You can read more about OmniAuth support in the wiki:
Configuring multiple models
Devise allows you to set up as many Devise models as you want. If you want to have an Admin model with just authentication and timeout features, in addition to the User model above, just run:
# Create a migration with the required fields
create_table :admins do |t|
t.string :email
t.string :encrypted_password
t.timestamps null: false
end
# Inside your Admin model
devise :database_authenticatable, :timeoutable
# Inside your routes
devise_for :admins
# Inside your protected controller
before_filter :authenticate_admin!
# Inside your controllers and views
admin_signed_in?
current_admin
admin_session
Alternatively, you can simply run the Devise generator.
Keep in mind that those models will have completely different routes. They do not and cannot share the same controller for sign in, sign out and so on. In case you want to have different roles sharing the same actions, we recommend that you use a role-based approach, by either providing a role column or using a dedicated gem for authorization.
ActiveJob Integration
If you are using Rails 4.2 and ActiveJob to deliver ActionMailer messages in the
background through a queuing back-end, you can send Devise emails through your
existing queue by overriding the send_devise_notification
method in your model.
def send_devise_notification(notification, *args)
devise_mailer.send(notification, self, *args).deliver_later
end
Password reset tokens and Rails logs
If you enable the Recoverable module, note that a stolen password reset token could give an attacker access to your application. Devise takes effort to generate random, secure tokens, and stores only token digests in the database, never plaintext. However the default logging behavior in Rails can cause plaintext tokens to leak into log files:
- Action Mailer logs the entire contents of all outgoing emails to the DEBUG level. Password reset tokens delivered to users in email will be leaked.
- Active Job logs all arguments to every enqueued job at the INFO level. If you configure Devise to use
deliver_later
to send password reset emails, password reset tokens will be leaked.
Rails sets the production logger level to DEBUG by default. Consider changing your production logger level to WARN if you wish to prevent tokens from being leaked into your logs. In config/environments/production.rb
:
config.log_level = :warn
Other ORMs
Devise supports ActiveRecord (default) and Mongoid. To select another ORM, simply require it in the initializer file.
Additional information
Heroku
Using Devise on Heroku with Ruby on Rails 3.2 requires setting:
config.assets.initialize_on_precompile = false
Read more about the potential issues at http://guides.rubyonrails.org/asset_pipeline.html
Warden
Devise is based on Warden, which is a general Rack authentication framework created by Daniel Neighman. We encourage you to read more about Warden here:
https://github.com/hassox/warden
Contributors
We have a long list of valued contributors. Check them all at:
https://github.com/plataformatec/devise/graphs/contributors
License
MIT License. Copyright 2009-2015 Plataformatec. http://plataformatec.com.br
You are not granted rights or licenses to the trademarks of Plataformatec, including without limitation the Devise name or logo.