Report abuse 

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require 'rubygems'
require 'sinatra'
require 'json'

configure do
  enable :sessions
end

get '/' do
  headers['Cache-Control'] = 'max-age=60, must-revalidate'
  PAGE
end

get '/userinfo' do
  if session[:user]
    JSON.dump(:user => session[:user])
  else
    halt 401
  end
end

get '/login' do
  session[:user] = 'rock'
  redirect '/'
end

get '/logout' do
  session.clear
  redirect '/'
end


PAGE = %(
<html>
<head>
<title>Hi</title>
<script src='http://www.scramble.com/javascripts/jquery-1.3.1.js'></script>
<script>
$(function() {
  $.getJSON('/userinfo', function(data) {
    $('h1').text('Hi ' + data.user);
    $('#nav .login-control').attr('href', '/logout').html('logout');
  })
})
</script>
</head>
<body>
<h1>Hi</h1>
<div id="nav">
<a href="/login" class='login-control'>Login</a>
</div>
<p>Non session specific content</p>
</body>
</html>
)