gistfile1.txt

  # Login
  post "/login" do
    @user = User.find_by_username(params[:username])
    if @user.password == params[:password]
      post to("/user?username=#{@user.username}")
    else
      redirect to("/login_or_signup?error=#{params[:username]}")
    end
  end
  
  post "/user" do
    @user = User.find_by_username(params[:username])
    erb :user
  end