Token Master
Minimal and Simple user management for Ruby and Rails applications.
Motivation
Whenever your application manages users, you will inevitably need to handle email confirmation, password reset, user invitations, and other authentication flows. While not too complicated, they are sort of annoying to implement and some great libraries have our backs. Devise and Sorcery are great options that we have used in the past, but we found ourselves wanting both a little less and a little more.
Devise
Devise is an amazing gem! It is perfect when you want an all-in-one solution that handles user authentication and associated flows for your Rails/ERB app. Everything is in the box, including the routes, controllers, views, and even mailers to handle user auth. But we often use Rails as an API and/or wanted more control over all those pieces and it became difficult to peel back all the layers to just to confirm a user's email.
Sorcery
Sorcery is great and we highly recommend it. It is closer to what we wanted but still was a bit more than we needed and even the < 20 methods seemed like more than necessary.
User Authentication Flows
Email confirmation, password reset, user invitations are all variations of the same process:
- Create a unique token that allows the user temporary and limited access to your application
- Notify the user with a link to redeem the token
- Redeem or reject the token based on certain conditions (ex. validity, expiration, etc)
- Update the user with any new information
- Revoke the token
They are all tokenable activities, and all you need to do them is a Token Master!
Enter the Token Master
Front-end agnostic
No routing, views, controllers, or mailers, just logic that you can use wherever and whenever you want.
Authentication strategy agnostic
Token Master does not handle user authentication, it assumes you have this covered with has_secure_password
, Devise, Sorcery, or other solutions
Unobtrusive
Does not take over your app, minimal magic, and only if you want it. Token Master works with your existing authentication solution.
Flexible
Works for APIs, ERB apps and everything in between.
Simple
Only 6 methods and you may not even use them all!
Helpful errors
We take the approach of raising an error whenever anything unexpected happens and provide a specific error with a helpful message to aid your debugging and testing experience.
Quick Start
Installation
Add this line to your application's Gemfile:
gem 'token_master'
And then execute:
$ bundle
Or install it yourself as:
$ gem install token_master
Add a tokenable
These examples assume Rails 5, but anything >= 4 will work.
Let's say you want to add email confirmation flow to your User.
Create and run a migration to add the necessary columns to the
users
tablebundle exec rails generate token_master User confirm bundle exec rails db:migrate
Add Token Master to the User class
class User < ApplicationRecord
token_master :confirm
end
- Somewhere during the signup flow, generate and send the token
class UsersController < ApplicationController
...
def create
# Creating the user is up to you, here is an example
user = User.create!(
email: params[:email],
password: params[:password],
password_confirmation: params[:password_confirmation]
)
# Generate and save a unique token
token = user.set_confirm_token!
# Mark the token as sent
user.send_confirm_instructions! do
# Sending the email is up to you
UserMailer.send_confirm(user) # or some other logic
end
end
...
end
- Somewhere during the confirmation flow, find and confirm the User
class UsersController < ApplicationController
...
def confirm
# find the user by the token and mark the token as completed
user = User.confirm_by_token!(params[:token])
...
end
...
end
Details
Let's revisit the Quick Start and fill in the details.
The Generator
When you ran the generator
bundle exec rails generate token_master User confirm
you provided 2 variables:
User
- The class name of the model to which you are adding the tokenableconfirm
- The name of the tokenable
Both of these could be anything, as long as you use the same class and name later on. If you like, you can create multiple tokenables at the same time, just add more space-separated tokenable names when calling the generator:
bundle exec rails generate token_master User confirm invite reset ...
Running the generator does 2 things:
- Creates a migration file in
#{Rails.root}/db/migrate
that looks like:
class AddConfirmTokenableToUsers < ActiveRecord::Migration[5.0]
def change
add_column :users, :confirm_token, :string, default: nil
add_column :users, :confirm_created_at, :timestamp, default: nil
add_column :users, :confirm_completed_at, :timestamp, default: nil
add_column :users, :confirm_sent_at, :timestamp, default: nil
add_index :users, :confirm_token
end
end
where the :users
table is determined from the User
argument and :confirm_*
is determined from the confirm
argument.
- Creates an initializer
#{Rails.root}/config/initializers/token_master.rb
that looks like:
TokenMaster.config do |config|
# Set up your configurations for each *tokenable* using the methods at the bottom of this file.
# Example: For `confirm` logic:
#
# config.add_tokenable_options :confirm,
# token_lifetime: 15, # days
# required_params: [:email],
# token_length: 30 # characters
#
# Default values:
# token_lifetime = 15 # days
# required_params = []
# token_length = 20 # characters
#
end
The default values will be used unless you configure them otherwise. These options can be set for each tokenable.
The Model
When you added the tokenable to your model
class User < ApplicationRecord
token_master :confirm
end
just make sure the class User
and tokenable(s) :confirm
(this can be multiple tokenables) match what you used in your generator.
Ex.
token_master :confirm, :invite, :reset, ...
There are 2 tiny bits of magic here:
In Rails apps by default, the Token Master module is included in your
ApplicationRecord
base class. However, if necessary, you can add this yourself by including the following in your class:include TokenMaster::Model
This adds the
token_master
class method we used above.When you call the
token_master
class method, for each tokenable you provide, 5 methods are added to the class (assuming the tokenable below isconfirm
):
Instance methods
set_confirm_token!
send_confirm_instructions!
confirm_status
force_confirm!
Class methods
confirm_by_token!
In addition to the 3 you have already seen in action, there is also:
confirm_status
- returns the current status of the tokenable. This is one of:
- 'no token'
- 'created'
- 'sent'
- 'completed'
- 'expired'
force_confirm!
- forcibly completes the given tokenable
See the Api Docs for more details.
Advanced
Sometimes in order to redeem a token, we want to make sure some additional information is present and possibly save that to our model. For example, when implementing a password reset flow, we want to update the User with the new password and make sure that its valid.
Assuming we are using has_secure_password
or something similar all we need to do is:
- Configure the tokenable to require these fields when redeeming the token ``` # in ../initializers/token_master.rb
TokenMaster.config do |config|
...
config.add_tokenable_options :reset_password, required_params: [:password, :password_confirmation]
...
end
2. Include those parameters when redeeming the token (If you don't you will get an error!)
User.reset_password_by_token!( token, password: password, password_confirmation: password_confirmation )
Under the hood, Token Master calls `update!` on the model, so if the model is not valid, it won't be saved and the token will not be redeemed.
## FAQ
### Can I use this without Rails?
Yes! However, there is a small dependency on ActiveRecord, see below.
### Can I use this without ActiveRecord?
Almost! There is only a slight dependence on a few ActiveRecord methods and its on our radar to refactor this a bit. In the meantime, a workaround is to make sure the class you are using implements `update`, `update!`, `save`, and `find_by`. In addition, you have to either add Token Master to your class with `include TokenMaster::Model` or use the Token Master core module explicitly:
`user.set_confirm_token!(token)` == `TokenMaster::Core.set_token!(User, :confirm)`
See the [Api Docs][docs] for more details.
### Who is Launchpad Lab?
We are product builders, check us out at [Launchpad Lab][lpl]
## Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/LaunchpadLab/token-master.
## License
The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).
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