webdap/app/controllers/auth.rb

class AuthController < Sinatra::Base

  get '/login' do
    erb :'auth/login', :locals => {
      :title => 'Login to your account'
    }
  end

  post '/login' do
    ldap = Net::LDAP.new
    ldap.host = cnf['ldap']['server_url']
    ldap.port = 389
    ldap.auth(params[:login_username], params[:login_password])
    if ldap.bind()
      session['ldap_uid'] = params[:username]
      redirect '/account/view'
    else
      # Authentication failure
      erb :'auth/login', :locals => {
        :title => 'Login to your account',
        :fail => true
      }
    end
  end

end