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Example of very simple password authentication.
<!-- layout file -->
<% if current_user %>
Welcome <%= current_user.username %>. Not you? <%= link_to "Log out", logout_path %>
<% else %>
<%= link_to "Sign up", signup_path %> or <%= link_to "log in", login_path %>.
<% end %>
class ApplicationController < ActionController::Base
helper_method, :current_user
private
def current_user
@current_user ||= User.find(session[:user_id]) if session[:user_id]
end
# call this as a before_filter to require them to be logged in
def login_required
if current_user.nil?
redirect_to login_url, :alert => "You must first log in or sign up before accessing this page."
end
end
end
<!-- login form under views/sessions/new.html.erb -->
<%= form_tag sessions_path do %>
<p>
<%= label_tag :login, "Username or Email Address" %><br />
<%= text_field_tag :login, params[:login] %>
</p>
<p>
<%= label_tag :password %><br />
<%= password_field_tag :password %>
</p>
<p><%= submit_tag "Log in" %></p>
<% end %>
match 'signup' => 'users#new', :as => :signup
match 'logout' => 'sessions#destroy', :as => :logout
match 'login' => 'sessions#new', :as => :login
resources :sessions
resources :users
class SessionsController < ApplicationController
def new
end
def create
user = User.authenticate(params[:login], params[:password])
if user
session[:user_id] = user.id
redirect_to root_url, :notice => "Logged in successfully."
else
flash.now[:alert] = "Invalid login or password."
render :action => 'new'
end
end
def destroy
session[:user_id] = nil
redirect_to root_url, :notice => "You have been logged out."
end
end
# run: rails g model User username:string email:string password_hash:string password_salt:string
class User < ActiveRecord::Base
# new columns need to be added here to be writable through mass assignment
attr_accessible :username, :email, :password, :password_confirmation
attr_accessor :password
before_save :prepare_password
validates_presence_of :password, :on => :create
validates_confirmation_of :password
validates_length_of :password, :minimum => 4, :allow_blank => true
# you may want to add validations to email/username here too
# login can be either username or email address
def self.authenticate(login, pass)
user = find_by_username(login) || find_by_email(login)
return user if user && user.matching_password?(pass)
end
def matching_password?(pass)
self.password_hash == encrypt_password(pass)
end
private
def prepare_password
unless password.blank?
self.password_salt = BCrypt::Engine.generate_salt
self.password_hash = encrypt_password(password)
end
end
def encrypt_password(pass)
BCrypt::Engine.hash_secret(pass, password_salt) # add to Gemfile: gem "bcrypt-ruby", :require => "bcrypt"
end
end
@ryanb

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@ryanb ryanb commented Jan 19, 2011

This is a simplified version of the nifty:authentication generator in Nifty Generators. I did not include the Users controller to handle registration/editing but that is fairly straight forward.

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@ryanb ryanb commented Jan 19, 2011

I highly recommend adding OmniAuth in here as well. That is simple to do as shown here.

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