change collections controller authentication

app/controllers/collections_controller.rb

 class CollectionsController < ApplicationController
   before_action :set_collection, only: [:show, :update, :destroy, :like, :add_learning_object]
-  before_action :authenticate_user!, except: [:index, :show]
+  before_action :authenticate_user!, only: [:show, :update, :destroy, :like, :add_learning_object]
 
   # GET /collections
   # GET /collections.json
   def index
-    @collections = collection_repository.all current_user
+    if user_signed_in?
+      @collections = collection_repository.all Collections::UserPublicContext.new(current_user)
+    else
+      @collections = collection_repository.all
+    end
   end
 
   # GET /collections/1