Add auth-token class

app/controllers/api/v1/registrant/auth_controller.rb

@@ -1,4 +1,5 @@
 require 'rails5_api_controller_backport'
+require 'auth_token'
 
 module Api
   module V1
@@ -7,11 +8,24 @@ module Api
         def eid
           login_params = set_eid_params
 
-          render json: login_params
+          user = RegistrantUser.find_or_create_by_api_data(login_params)
+
+          unless user.valid?
+            render json: user.errors, status: :bad_request
+          else
+            token = create_token(user)
+            render json: token
+          end
         end
 
         def set_eid_params
-          params.permit(:ident, :first_name, :last_name, :country)
+          params.permit(:ident, :first_name, :last_name)
+        end
+
+        def create_token(user)
+          token = AuthToken.new
+          hash = token.generate_token(user)
+          hash
         end
       end
     end