app/models/token.rb
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 require 'ipaddr'
 
 class Token
 	include Mongoid::Document
 	include Mongoid::Timestamps::Created
 
 	index({ token: 1 })
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     belongs_to :user
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 	field :token, type: String
 	field :date_expiring, type: DateTime
 	field :ip, type: Integer
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     field :user_id, type: Moped::BSON::ObjectId
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     ##
     # @return [Token]
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 	def self.authenticate(session)
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 		if session[:created_at].nil?
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 			return false
 		end
 
 		matched_token = self.where(:token				=> session[:token],
 								   :ip					=> IPAddr.new(session[:ip]).to_i,
 								   :date_expiring.lte	=> session[:created_at] + Rails.application.config.max_lifetime,
 								   :created_at			=> session[:created_at]
 				).limit(1).first
 
 		matched_token
 	end
 
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 	def save_session(session, user)
         self.token         = session[:token]
         self.date_expiring = session[:created_at] + Rails.application.config.max_lifetime
         self.created_at    = session[:created_at]
         self.ip			   = IPAddr.new(session[:ip]).to_i
         self.user_id       = user
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         save
     end
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 	#def self.remove_old_session(token)
 	#	self.delete_all(token: token)
 	#end
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     def self.fing_user_accounts_having_to_token(token)
         where(token: token).first().user.jids
     end
 
     private
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 	def self.generate_token
 		begin
 			token = SecureRandom.urlsafe_base64
 		end while Token.where(token: token).exists?
 
 		token
 	end
 end