Rails Authlogic authentication method - ruby-on-rails

Question

Within Authlogic, is there a way that I can add conditions to the authentication method? I know by using the find_by_login_method I can specify another method to use, but when I use this I need to pass another parameter since the find_by_login_method method only passes the parameter that is deemed the 'login_field'.
What I need to do is check something that is an association of the authentic model.. Here is the method I want to use
# make sure that the user has access to the subdomain that they are
# attempting to login to, subdomains are company names
def self.find_by_email_and_company(email, company)
user = User.find_by_email(email)
companies = []
user.brands.each do |b|
companies << b.company.id
end
user && companies.include?(company)
end
But this fails due to the fact that only one parameter is sent to the find_by_email_and_company method.
The company is actually the subdomain, so in order to get it here I am just placing it in a hidden field in the form (only way I could think to get it to the model)
Is there a method I can override somehow..?
Using the answer below I came up with the following that worked:
User Model (User.rb)
def self.find_by_email_within_company(email)
# find the user
user = self.find_by_email(email)
# no need to continue if the email address is invalid
return false if user.nil?
# collect the subdomains the provided user has access to
company_subdomains = user.brands.map(&:company).map(&:subdomain)
# verify that the user has access to the current subdomain
company_subdomains.include?(Thread.current[:current_subdomain]) && user
end
Application Controller
before_filter :set_subdomain
private
def set_subdomain
# helper that retreives the current subdomain
get_company
Thread.current[:current_subdomain] = #company.subdomain
end
User Session Model (UserSession.rb)
find_by_login_method :find_by_email_within_company
I have read a few things about using Thread.current, and conflicting namespaces.. This is a great solution that worked for me but would love to hear any other suggestions before the bounty expires, otherwise, +100 to Jens Fahnenbruck :)

Answer 1

Authlogic provides API for dealing with sub domain based authentication.
class User < ActiveRecord::Base
has_many :brands
has_many :companies, :through => :brands
acts_as_authentic
end
class Brand < ActiveRecord::Base
belongs_to :user
belongs_to :company
end
class Company < ActiveRecord::Base
has_many :brands
has_many :users, :through => :brands
authenticates_many :user_sessions, :scope_cookies => true
end
Session controller:
class UserSessionsController < ApplicationController
def create
#company = Company.find(params[:user_session][:company])
#user_session = #company.user_sessions.new(params[:user_session])
if #user_session.save
else
end
end
end
On the other hand
Here is a way to solve the problem using your current approach(I would use the first approach):
Set custom data - to the key email of the hash used to create the UserSession object.
AuthLogic will pass this value to find_by_login method. In the find_by_login method access the needed values.
Assumption:
The sub domain id is set in a field called company in the form.
class UserSessionsController < ApplicationController
def create
attrs = params[:user_session].dup #make a copy
attrs[:email] = params[:user_session] # set custom data to :email key
#user_session = UserSession.new(attrs)
if #user_session.save
else
end
end
end
Model code
Your code for finding the user with the given email and subdomain can be simplified and optimized as follows:
class User < ActiveRecord::Base
def find_by_email params={}
# If invoked in the normal fashion then ..
return User.first(:conditions => {:email => params}) unless params.is_a?(Hash)
User.first(:joins => [:brands => :company}],
:conditions => ["users.email = ? AND companies.id = ?",
params[:email], params[:company]])
end
end
Edit 1
Once the user is authenticated, system should provide access to authorized data.
If you maintain data for all the domains in the same table, then you have to scope the data by subdomain and authenticated user.
Lets say you have Post model with company_id and user_id columns. When a user logs in you want to show user's posts for the sub domain. This is one way to scope user's data for the subdomain:
Posts.find_by_company_id_and_user_id(current_company, current_user)
Posts.for_company_and_user(current_company, current_user) # named scope
If you do not scope the data, you will have potential security holes in your system.

Answer 2

In your lib folder add a file with the follwing content:
class Class
def thread_local_accessor name, options = {}
m = Module.new
m.module_eval do
class_variable_set :"###{name}", Hash.new {|h,k| h[k] = options[:default] }
end
m.module_eval %{
FINALIZER = lambda {|id| ###{name}.delete id }
def #{name}
###{name}[Thread.current.object_id]
end
def #{name}=(val)
ObjectSpace.define_finalizer Thread.current, FINALIZER unless ###{name}.has_key? Thread.current.object_id
###{name}[Thread.current.object_id] = val
end
}
class_eval do
include m
extend m
end
end
end
I found this here
Then add code in the controller like this:
class ApplicationController < ActionController
before_filter :set_subdomain
private
def set_subdomain
User.subdomain = request.subdomains[0]
end
end
And now you can do the following in your user model (assuming your company model has a method called subdomain:
class User < ActiveRecord::Base
thread_local_accessor :subdomain, :default => nil
def self.find_by_email_within_company(email)
self.find_by_email(email)
company_subdomains = user.brands.map(&:company).map(&:subdomain)
company_subdomains.include?(self.subdomain) && user
end
end
And FYI:
companies = user.brands.map(&:company).map(&:subdomain)
is the same as
companies = []
user.brands.each do |b|
companies << b.company.subdomain
end

Answer 3

With rails 3 you can use this workaround:
class UserSessionsController < ApplicationController
...
def create
#company = <# YourMethodToGetIt #>
session_hash = params[:user_session].dup
session_hash[:username] = { :login => params[:user_session][:username], :company => #company }
#user_session = UserSession.new(session_hash)
if #user_session.save
flash[:notice] = "Login successful!"
redirect_back_or_default dashboard_url
else
#user_session.username = params[:user_session][:username]
render :action => :new
end
...
end
Then
class UserSession < Authlogic::Session::Base
find_by_login_method :find_by_custom_login
end
and
class User < ActiveRecord::Base
...
def self.find_by_custom_login(hash)
if hash.is_a? Hash
return find_by_username_and_company_id(hash[:login], hash[:company].id) ||
find_by_email_and_company_id(hash[:login], hash[:company].id)
else
raise Exception.new "Error. find_by_custom_login MUST be called with {:login => 'username', :company => <Company.object>}"
end
end
...
end
Which is quite plain and "correct". I take me a lot of time to find out, but it works fine!