cla fix and add token verify

app/controllers/users/clas_controller.rb

@@ -11,14 +11,16 @@ class Users::ClasController <  Users::BaseController
 
     def create
         @user_cla = current_user.user_clas.find_by(cla_id: params[:cla_id])
-        if @user_cla
-            @user_cla.update_attributes(state: 1)
-        else
+        if @user_cla.nil?
             ActiveRecord::Base.transaction do
                 Users::UserClaForm.new(user_cla_params).validate!
                 @user_cla = UserCla.build(user_cla_params, current_user.id)
                 
             end
+        elsif @user_cla.state == "failed"
+            @user_cla.update_by_params(user_cla_params)
+        elsif @user_cla.state == "signed"
+            return render_error('协议生效中，请勿重复签署') 
         end
         render_ok
         rescue Exception => e