A little sinatra gem that implements user authentication, with support for DataMapper.

(Forked from maxjustus' version. I don't need TC or Mongo, nor Facebook integration)

INSTALLATION:

In your sinatra app simply require "dm-core", "digest/sha1", 'rack-flash' (if you want flash messages) and then "sinatra-authentication" and turn on session storage with a super secret key, like so:

require "dm-core"
#for using auto_migrate!
require "dm-migrations"
require "digest/sha1"
require 'rack-flash'
require "sinatra-authentication"

use Rack::Session::Cookie, :secret => 'A1 sauce 1s so good you should use 1t on a11 yr st34ksssss'
#if you want flash messages
use Rack::Flash

DEFAULT ROUTES:

• get '/login'
• get '/logout'
• get '/signup'
• get/post '/users'
• get '/users/:id'
• get/post '/users/:id/edit'
• get '/users/:id/delete'

If you fetch any of the user pages using ajax, they will automatically render without a layout

FLASH MESSAGES

Flash messages are implemented using rack-flash. To set them up add this to your code:

require 'rack-flash'

#be sure and do this after after 'use Rack:Session:Cookie...'
use Rack::Flash

And then sinatra-authentication related flash messages will be made available through flash[:notice]

-# somewhere in a haml view:
= flash[:notice]

HELPER METHODS:

This plugin provides the following helper methods for your sinatra app:

• login_required

  which you place at the beginning of any routes you want to be protected

• current_user
• logged_in?
• render_login_logout(html_attributes)

  Which renders login/logout and singup/edit account links. If you pass a hash of html parameters to render_login_logout all the links will get set to them. Which is useful for if you're using some sort of lightbox

SIMPLE PERMISSIONS:

By default the user class includes a method called admin? which simply checks if user.permission_level == -1.

you can take advantage of this method in your views or controllers by calling current_user.admin? i.e.

- if current_user.admin?
  %a{:href => "/adminey_link_route_thing"} do something adminey

(these view examples are in HAML, by the way)

You can also extend the user class with any convenience methods for determining permissions. i.e.

#somewhere in the murky depths of your sinatra app
class User
  def peasant?
    self.permission_level == 0
  end
end

then in your views you can do

- if current_user.peasant?
  %h1 hello peasant!
  %p Welcome to the caste system! It's very depressing.

if no one is logged in, current_user returns a GuestUser instance, which responds to current_user.guest? with true, current_user.permission_level with 0 and any other method calls with false

This makes some view logic easier since you don't always have to check if the user is logged in, although a logged_in? helper method is still provided

OVERRIDING DEFAULT VIEWS

Right now if you're going to override sinatra-authentication's views, you have to override all of them. This is something I hope to change in a future release.

To override the default view path do something like this:

set :sinatra_authentication_view_path, Pathname(__FILE__).dirname.expand_path + "my_views/"

And then the views you'll need to define are:

• show.haml
• index.haml
• signup.haml
• login.haml
• edit.haml

The signup and edit form fields are named so they pass a hash called 'user' to the server:

%input{:name => "user[email]", :size => 30, :type => "text", :value => @user.email}
%input{:name => "user[password]", :size => 30, :type => "password"}
%input{:name => "user[password_confirmation]", :size => 30, :type => "password"}

%select{:name => "user[permission_level]"}
  %option{:value => -1, :selected => @user.admin?}
    Admin
  %option{:value => 1, :selected => @user.permission_level == 1}
    Authenticated user

if you add attributes to the User class and pass them in the user hash your new attributes will be set along with the others.

The login form fields just pass a field called email and a field called password:

%input{:name => "email", :size => 30, :type => "text"}
%input{:name => "password", :size => 30, :type => "password"}

To add methods or properties to the User class, you have to access the underlying database user class, like so:

class DmUser
  property :name, String
  property :has_dog, Boolean, :default => false
end

And then to access/update your newly defined attributes you use the User class:

current_user.name
current_user.has_dog

current_user.update({:has_dog => true})

new_user = User.set({:email => 'max@max.com' :password => 'hi', :password_confirmation => 'hi', :name => 'Max', :has_dog => false})

User.all(:has_dog => true).each do |user|
  user.update({has_dog => false})
end

User.all(:has_dog => false).each do |user|
  user.delete
end

the User class passes additional method calls along to the interfacing database class, so calls to Datamapper functions should work as expected.

The database user class is named

DmUser