Sinatra authentication helpers

sinatra_basic_auth.rb

def auth
  @auth ||= Rack::Auth::Basic::Request.new(request.env)
end

def current_user
  @current_user
end

def authenticated?
  request.env['REMOTE_USER']
end

def authenticate(email, password)
  if @current_user = User.find_by_email(email)
    @current_user.valid_password?(password)
  end
end

def authenticate!
  return if authenticated?
  halt_with_401_authorization_required unless auth.provided?
  handle_authentication_credentials
end

def permit_authentication
  return if authenticated?
  handle_authentication_credentials if auth.provided?
end

def handle_authentication_credentials
  halt_with_400_bad_request unless auth.basic? && auth.credentials
  halt_with_401_authorization_required("Bad credentials") unless authenticate(*auth.credentials)
  request.env['REMOTE_USER'] = auth.username
end