Simple Auth

SimpleAuth is an authentication library to be used when everything else is just too complicated.

This library only supports in-site authentication and won't implement OpenID, Facebook Connect and like.

Rails 3.1.0+ is required.

Installation

Just the following line to your Gemfile:

gem "simple_auth"

Then run rails generate simple_auth:install to copy the initializer file.

Usage

Your user model should have the attribute password_digest. The credential field can be anything you want, but SimpleAuth uses [:email, :login] by default.

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :email, null: false
      t.string :login, null: false
      t.string :password_digest, null: false

      t.timestamps
    end

    add_index :users, :email, unique: true
    add_index :users, :login, unique: true
    add_index :users, [:email, :login]
  end
end

In your model, use the authentication macro.

class User < ActiveRecord::Base
  authentication
end

This will add some callbacks and password validations. It will also inject helper methods like Model.authenticate.

Session is valid only when both Model#authorized? and Controller#authorized? methods return true, which is the default behavior. You can override these methods with your own rules:

class User < ActiveRecord::Base
  authentication

  def authorized?
    deleted_at.nil?
  end
end

class Admin::DashboardController < ApplicationController
  private
  def authorized?
    current_user.admin?
  end
end

After you set up the model, you can go to the controller.

class SessionsController < ApplicationController
  def new
    @user_session = SimpleAuth::Session.new
  end

  def create
    @user_session = SimpleAuth::Session.new(params[:session])

    if @user_session.save
      redirect_to return_to(dashboard_path)
    else
      flash[:alert] = "Invalid username or password"
      render :new
    end
  end

  def destroy
    current_session.destroy if logged_in?
    redirect_to root_path
  end
end

The return_to helper will give you the requested url (before the user logged in) or the default url.

You can restrict access by using 2 macros:

class SignupController < ApplicationController
  redirect_logged_user :to => "/"
end

Here's some usage examples:

redirect_logged_user :to => proc { login_path }
redirect_logged_user :to => {:controller => "dashboard"}
redirect_logged_user :only => [:index], :to => login_path
redirect_logged_user :except => [:public], :to => login_path

You can skip the :to option if you set it globally on your initializer:

SimpleAuth::Config.logged_url = {:controller => "session", :action => "new"}
SimpleAuth::Config.logged_url = proc { login_path }

To require a logged user, use the require_logged_user macro:

class DashboardController < ApplicationController
  require_logged_user :to => proc { login_path }
end

Here's some usage examples:

require_logged_user :to => proc { login_path }
require_logged_user :to => {:controller => "session", :action => "new"}
require_logged_user :only => [:index], :to => login_path
require_logged_user :except => [:public], :to => login_path

You can skip the :to option if you set it globally on your initializer:

SimpleAuth::Config.login_url = {:controller => "session", :action => "new"}
SimpleAuth::Config.login_url = proc { login_path }

There are some helpers:

logged_in?              # controller & views
current_user            # controller & views
current_session         # controller & views
when_logged(&block)     # views
find_by_credential      # model
find_by_credential!     # model

If you're having problems to use any helper, include the module SimpleAuth::Helper on your ApplicationHelper.

module ApplicationHelper
  include SimpleAuth::Helper
end

Translations

These are the translations you'll need:

en:
  simple_auth:
    sessions:
      need_to_be_logged: "You need to be logged"
      invalid_credentials: "Invalid username or password"

Compatibility Mode with v1

The previous version was based on hashing with salt. If you want to migrate to the v2 release, you must do some things.

First, add the following line to the configuration initializer (available at config/initializers/simple_auth.rb:

require "simple_auth/compat"

Then create a field called password_digest. This field is required by the ActiveRecord::Base.has_secure_password method. You can create a migration with the following content:

class AddPasswordDigestToUsers < ActiveRecord::Migration
  def up
    add_column :users, :password_digest, :string, null: true
    SimpleAuth.migrate_passwords!
    change_column_null :users, :password_digest, false
  end

  def down
    remove_column :users, :password_digest
  end
end

Apply this migration with rake db:migrate. Go read a book; this is going to take a while.

Check if your application is still working. If so, you can remove the password_hash column. Here's the migration to do it so.

class RemovePasswordHashFromUsers < ActiveRecord::Migration
  def change
    remove_column :users, :password_hash
  end
end

Again, apply this migration with rake db:migrate.

Maintainer

• Nando Vieira (http://simplesideias.com.br)

License:

(The MIT License)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.