Jazzatola/app.rb

## app.rb
require 'sinatra'
require 'warden'

class User

  def initialize(id = nil)
    @id = id
  end

  def self.find_by_username(username)
    User.new
  end

  def authenticate?(password)
    password == 'password'
  end

  def id
    @id ||= SecureRandom.random_number(100)
  end

end

enable :sessions

use Warden::Manager do |config|
  config.default_strategies :password
  config.failure_app = Sinatra::Application
  config.serialize_into_session {|user| user.id }
  config.serialize_from_session {|id| User.new(id) }
end

Warden::Manager.before_failure do |env, opts|
  env['REQUEST_METHOD'] = 'POST'
end

Warden::Manager.before_logout do |user,auth,opts|
  auth.env['rack.logger'].info "Logging out user with id #{user.id}"
end

Warden::Strategies.add(:password) do
  def valid?
    params['username'] && params['password']
  end

  def authenticate!
    user = User.find_by_username(params['username'])
    if user.authenticate?(params['password'])
      success!(user)
    else
      fail!
    end
  end
end

get '/' do
  if env['warden'].authenticated?
    "Logged in as user with id #{env['warden'].user.id}. <a href=\"/logout\">Logout</a>"
  else
    'Unknown user. <a href="/session">Login</a>'
  end
end

get '/session' do
  erb :login
end

post '/session' do
  env['warden'].authenticate!
  redirect '/'
end

get '/logout' do
  env['warden'].logout
  redirect '/'
end

post '/unauthenticated/?' do
  redirect '/'
end

__END__

@@ login
<html>
<head><title>Login</title></head>
<body>
<form method="post" action="/session">
<p>
  <label for="username">Username</label> <input type="text" name="username"/>
</p>
<p>
  <label for="password">Password</label> <input type="password" name="password" required/>
</p>
<p>
  <button type="submit">Login</button>
</p>
</form>
</body>
</html>
	require 'sinatra'
	require 'warden'

	class User

	def initialize(id = nil)
	@id = id
	end

	def self.find_by_username(username)
	User.new
	end

	def authenticate?(password)
	password == 'password'
	end

	def id
	@id \|\|= SecureRandom.random_number(100)
	end

	end

	enable :sessions

	use Warden::Manager do \|config\|
	config.default_strategies :password
	config.failure_app = Sinatra::Application
	config.serialize_into_session {\|user\| user.id }
	config.serialize_from_session {\|id\| User.new(id) }
	end

	Warden::Manager.before_failure do \|env, opts\|
	env['REQUEST_METHOD'] = 'POST'
	end

	Warden::Manager.before_logout do \|user,auth,opts\|
	auth.env['rack.logger'].info "Logging out user with id #{user.id}"
	end

	Warden::Strategies.add(:password) do
	def valid?
	params['username'] && params['password']
	end

	def authenticate!
	user = User.find_by_username(params['username'])
	if user.authenticate?(params['password'])
	success!(user)
	else
	fail!
	end
	end
	end

	get '/' do
	if env['warden'].authenticated?
	"Logged in as user with id #{env['warden'].user.id}. <a href=\"/logout\">Logout</a>"
	else
	'Unknown user. <a href="/session">Login</a>'
	end
	end

	get '/session' do
	erb :login
	end

	post '/session' do
	env['warden'].authenticate!
	redirect '/'
	end

	get '/logout' do
	env['warden'].logout
	redirect '/'
	end

	post '/unauthenticated/?' do
	redirect '/'
	end

	__END__

	@@ login
	<html>
	<head><title>Login</title></head>
	<body>
	<form method="post" action="/session">
	<p>
	<label for="username">Username</label> <input type="text" name="username"/>
	</p>
	<p>
	<label for="password">Password</label> <input type="password" name="password" required/>
	</p>
	<p>
	<button type="submit">Login</button>
	</p>
	</form>
	</body>
	</html>