Added restriction in uploading file

hyrax/app/models/hyrax/uploaded_file.rb

@@ -15,7 +15,9 @@ module Hyrax
     belongs_to :user, class_name: '::User'
     
     before_create :set_characterization_data
-    ##
+
+    validate :uploaded_file_name, on: :create
+    ## 
     # Associate a {FileSet} with this uploaded file.
     #
     # @param [Hyrax::Resource, ActiveFedora::Base] file_set
@@ -44,5 +46,15 @@ module Hyrax
       self.characterization_data[:file_size]  = file.size
       self.characterization_data[:original_checksum] = Digest::SHA1.file(file.path).to_s
     end
+
+    def uploaded_file_name
+      parsed_file =  YAML.load_file(Rails.root.join('config', 'restricted_files.yml'))
+
+      file_name = file.file.original_filename
+      
+      if parsed_file['restricted_file_names'].include?(file_name.gsub(/[\s_\-]/, '').downcase) || file_name.start_with?('.')
+        errors.add(:base, "This file name is restricted.")
+      end
+    end
   end
 end
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hyrax/config/restricted_files.yml

+restricted_file_names:
+  - metadata.json
+  - meta.json
+  - .DS_Store
+  - desktop.ini
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