Monban 門番
Monban is designed to be a very simple and extensible user authentication
library for rails. Its goal is to give all the power to the developer instead
of forcing them to make Monban work with their system.
Why use Monban?
Monban makes authentication simple:
- Easy to use in tests with dependency injection
- Provides convenient controller helpers
- Very customizable
Monban doesn't do the following:
- Doesn't automatically add routes to your application
- Doesn't force you to use engine based controllers or views
- Doesn't require you to make changes to your user model
Documentation
You can read the full documentation at rubydoc
Installation
Monban was designed to work with Rails > 4.0. Add this line to your Gemfile:
gem 'monban'
Then inside of your ApplicationController add the following:
include Monban::ControllerHelpers
And you're ready to start designing your authentication system.
Generators
If you'd like a good starting point for building an app using Monban, it is suggested to use the monban generators
Usage
Monban does currently have some out-of-the-box expectations, but you can
configure and change any of these:
- By default the model should be called
User
- Monban expects your user model to respond to
create
, id
, and find_by
- You should have an
email
and password_digest
column on your User
- Passwords will be handled with BCrypt
Suggestions
Console Usage
If you're trying to sign up a User in a console you won't be able to call User#new or User#create because the User model does not know how to encrypt passwords.
You should instead use the sign up service in order to create the user:
Monban.config.sign_up_service.new(email: "foo@example.com", password: "password").perform
Validations
Monban doesn't add validations to your user model unless you're using monban generators so it's suggested to add the following validations:
validates :email, presence: true, uniqueness: true
validates :password_digest, presence: true
In addition to that you'll want to add the following to your config/locale/en.yml
:
en:
activerecord:
attributes:
user:
password_digest: "Password"
Which will generate the error message Password can't be blank
instead of Password digest can't be blank
.
Layout changes
It is suggested you add something like this to your application layout:
<% if signed_in? %>
<%= link_to "Sign out", session_path, method: :delete %>
<% else %>
<%= link_to "Sign in", new_session_path %>
<%= link_to "Sign up", new_user_path %>
<% end %>
Guest user
If you want to introduce a Guest object when a user is not signed in, you can override Monban's current_user
method in your ApplicationController
:
def current_user
super || Guest.new
end
In app/models/
, define a Guest
class:
class Guest
def name
"Guest"
end
end
This article on the Null Object Pattern provides a good explanation of why you might want to do this.
Using I18n for sign in notice
If you want to use I18n for the notice instructing users to sign in when they try to access an unauthorized page you can do so with the following configuration:
Monban.configure do |config|
config.sign_in_notice = -> { I18n.t("sign_in_notice") }
end
It is suggested to store this file at config/initializers/monban.rb
Controller Additions
Monban provides the following controller methods:
sign_in(user)
sign_out
sign_up(user_params)
authenticate(user, password)
authenticate_session(session_params)
reset_password(user, password)
These helpers:
And this filter:
Routing Constraints
To authorize users in config/routes.rb
:
require "monban/constraints/signed_in"
require "monban/constraints/signed_out"
Blog::Application.routes.draw do
constraints Monban::Constraints::SignedIn.new do
root "dashboards#show", as: :dashboard
end
constraints Monban::Constraints::SignedOut.new do
root "landings#show"
end
end
Usage in Tests
Test mode
Monban provides the following:
Monban.test_mode!
Which will change password hashing method to provide plaintext responses instead of using BCrypt. This will allow you to write factories using the password_digest field:
FactoryBot.define do
factory :user do
username 'wombat'
password_digest 'password'
end
end
Spec helpers
A couple of convenience methods are available in your tests. In order to set this up you'll want to add the following to rails_helper.rb
or if that doesn't exist spec_helper.rb
Monban.test_mode!
RSpec.configure do |config|
config.include Monban::Test::Helpers, type: :feature
config.after :each do
Monban.test_reset!
end
end
Then you can use any of the test helpers in your scenarios
feature "A feature spec" do
scenario "that requires login" do
user = create(:user)
sign_in(user)
sign_out
end
end
Monban Backdoor
Similar to clearance's backdoor you can visit a path and sign in quickly via
user = create(:user)
visit dashboard_path(as: user)
To enable this functionality you'll want to add the following to config/environments/test.rb
:
config.middleware.insert_after Warden::Manager, Monban::BackDoor
If you'd like to find your User model by a field other than id
, insert the
middleware with a block that accepts the as
query parameter and returns an
instance of your User model:
config.middleware.insert_after Warden::Manager, Monban::BackDoor do |user_param|
User.find_by(username: user_param)
end
Controller Specs
If you are going to write controller tests, helpers are provided for those as well:
Monban.test_mode!
RSpec.configure do |config|
config.include Monban::Test::ControllerHelpers, type: :controller
config.after :each do
Monban.test_reset!
end
end
require 'spec_helper'
describe ProtectedController do
describe "GET 'index'" do
it "returns http success when signed in" do
user = create(:user)
sign_in(user)
get 'index'
response.should be_success
end
it "redirects when not signed in" do
get 'index'
response.should be_redirect
end
end
end
Advanced Functionality
Authentication with username instead of email
If you want to sign in with username instead of email just change the configuration option
Monban.configure do |config|
config.user_lookup_field = :username
end
If you used the monban:scaffold generator from monban generators you'll have to change the following four references to email.
- In SessionsController#session_params
- In UsersController#user_params
- The email form field on sessions#new
- The email form field on users#new
Using multiple lookup fields
You may perform a look up on a user using multiple fields by doing something like the following:
class SessionsController < ApplicationController
def create
user = authenticate_session(session_params, email_or_username: [:email, :username])
if sign_in(user)
redirect_to(root_path)
else
render :new
end
end
private
def session_params
params.require(:session).permit(:email_or_username, :password)
end
end
This will allow the user to enter either their username or email to login
Configuration
Monban::Configuration has lots of options for changing how monban works. Currently the options you can change are as follows:
User values
- user_lookup_field: (default
:email
) Field in the database to lookup a user by. - user_token_field: (default
:password
) Field the form submits containing the undigested password. - user_token_store_field: (default:
:password_digest
) Field in the database that stores the user's digested password. - user_class: (default:
'User'
) The user class.
Services
- sign_in_notice: (default:
You must be signed in
) Rails flash message to set when user signs in. - sign_in_service: (default:
Monban::Services::SignIn
) Service for signing a user in. - sign_up_service: (default:
Monban::Services::SignUp
) Service for signing a user up. - sign_out_service: (default:
Monban::Services::SignOut
) Service for signing a user out. - authentication_service: (default:
Monban::Services::Authentication
) Service for authenticated a user. - password_reset_service: (default:
Monban::Services::PasswordReset
) Service for resetting a user's password.
Rails values
- no_login_handler: A before_action for rails that handles when a user is not signed in.
- no_login_redirect: Used by the no_login_handler to redirect the user
Methods
- hashing_method: Method to hash an undigested password.
- token_comparison: Method to compare a digested and undigested password.
- creation_method: Method for creating a user.
- find_method: Method for finding a user.
Warden Settings
- failure_app: Necessary for warden to work. A rack app that handles failures in authentication.
Limitations
Here are a few of the current limitations of monban:
- Monban assumes you only have one user model.
Contributing
- Fork it
- Create your feature branch (
git checkout -b my-new-feature
) - Commit your changes (
git commit -am 'Add some feature'
) - Push to the branch (
git push origin my-new-feature
) - Create new Pull Request