Creating a custom Devise Strategy - ruby-on-rails

Question

Been fighting with this for a while now, not sure why it isn't working.
The gist is looking to use Devise with LDAP. I don't need to do anything except for authenticate so I have no need to use anything except for a custom strategy.
I created one based on https://github.com/plataformatec/devise/wiki/How-To:-Authenticate-via-LDAP and as far as I can tell everything should work except whenever I try to run the server (or rake route) I get a NameError
lib/devise/models.rb:88:in `const_get': uninitialized constant Devise::Models::LdapAuthenticatable (NameError)
I've traced the error down to my app/models/user.rb
class User < ActiveRecord::Base
devise :ldap_authenticatable, :rememberable, :trackable, :timeoutable
end
If I remove :ldap_authenticatable then the crash goes away but I have no routes to user#session and a login prompt cannot be accessed.
My supporting files:
lib/ldap_authenticatable.rb
require 'net/ldap'
require 'devise/strategies/authenticatable'
module Devise
module Strategies
class LdapAuthenticatable < Authenticatable
def authenticate!
if params[:user]
ldap = Net::LDAP.new
ldap.host = 'redacted'
ldap.port = 389
ldap.auth login, password
if ldap.bind
user = User.where(login: login).first_or_create do |user|
success!(user)
else
fail(:invalid_login)
end
end
end
def login
params[:user][:login]
end
def password
params[:user][:password]
end
end
end
end
Warden::Strategies.add(:ldap_authenticatable, Devise::Strategies::LdapAuthenticatable)
And finally, inside config/initializers/devise.rb
Devise.setup do |config|
# ==> LDAP Configuration
require 'ldap_authenticatable'
config.warden do |manager|
manager.default_strategies(:scope => :user).unshift :ldap_authenticatable
end
end
I've exhausted my searches, maybe someone can see something I am missing.
Cheers

Answer 1

Is your lib/ldap_authenticatable.rb is in the autoload path or explicitly required? Since Rails 3 code in lib folder isn't autoloaded by default any more. Here is one way on how to solve it
IMHO Devise is a great gem. However in order to write your own strategy you have to be familiar not only with Devise but with Warden source code as well, and a lot of boilerplate code needs to be written in various places, so I start to investigate how to make customizations easier for Devise and come up with this gem devise_custom_authenticatable. You can check it and probably it'll solve your problem in a different way. This gem is used in production code base for rather busy application, so it battle proven :)

Answer 2

File paths should match namespaces. You need to add 2 levels of directories.
mkdir lib/devise
mkdir lib/devise/strategies
mv lib/ldap_authenticatable.rb lib/devise/strategies/ldap_authenticatable.rb
Since you are namespaced to
module Devise
module Strategies
class LdapAuthenticatable < Authenticatable
...

Answer 3

few steps to take care while creating custom strategy:
you will have to take care of the strategies folder as #csi mentioned along with it create a models folder and inside models create ldap_authenticatable.rb . so the structure will look like this.
lib/devise/strategies/ldap_authenticatable.rb
lib/devise/models/ldap_authenticatable.rb
Add these lines to lib/devise/models/ldap_authenticatable.rb
require Rails.root.join('lib/devise/strategies/ldap_authenticatable')
module Devise
module Models
module LdapAuthenticatable
extend ActiveSupport::Concern
end
end
end
In config/initializers/devise.rb add these lines to the top.
Devise.add_module(:ldap_authenticatable, {
strategy: true,
controller: :sessions,
model: 'devise/models/ldap_authenticatable',
route: :session
})
This should take care of the custom auth.