has_protected_token

Current version: 0.0.0beta. This gem is currently in pre-release beta and a stable release will be made real soon now.

What?

Abstracts away generating, storing and validating user auth tokens. Use it if you need to deal with shared secrets, etc.

Installation

Requirements: Ruby >= 2.2, ActiveRecord >= 4.2

From the command line:

$ gem install has_protected_token

In your project gemfile:

  gem 'has_protected_token'

Usage

Adding it to your model

Add it to your model as you would with has_secure_password:

class User < ActiveRecord::Base
  has_protected_token
end

The gem assumes the existance of a token attribute on the model. If you would like to use a different name, you can pass an optional hash:

has_protected_token column_name: :my_column_name

The gem will replace 'token' with 'my_column_name' in all instance methods described below. Thus, #token becomes #my_column_name, #regenerate_token becomes #regenerate_my_column_name, etc.

Generating and validating tokens

To automatically generate a new random token and save it to your model, call #regenerate_token:

user = User.new
user.regenerate_token
  # => 'e13d0bbd4a12d2aea673127c7e995a67'
user.token
  # => '$2a$12$5xVuny6Z79bYfgMMU7nyzeaOSjygRnXfsJjeJHzRZ0vUYRGeUjo6u'

If you would like to supply your own token:

user = User.new
user.token = 'happiness is a cup of coffee'
  # => 'happiness is a cup of coffee'
user.save!
  # => true
user.token
  # => '$2a$12$5zWuBy3279hYfgOMU2nyz3aQWjygTnXfsJjeJHzRZ0vUYZGeUgY6W'

To validate a token against the hashed value stored in the database:

user.validate_token('correct value')
  # => true
user.validate_token('incorrect value')
  # => false

More advanced features

has_protected_token uses BCrypt to hash the token before storage. By default, it uses BCrypt's default cost (currently 12) during hashing. You can lower this value to speed up the hashing process at the cost of lower security, or raise it for the opposite effect. Simply add a cost parameter to the options hash when calling has_protected_token:

has_protected_token cost: 16