From 309956e472189f70e56bdccaa7ae4b43422ec7bf Mon Sep 17 00:00:00 2001
From: Sebastian Serth <Sebastian.Serth@hpi.de>
Date: Wed, 24 Aug 2022 12:41:49 +0200
Subject: [PATCH] Remove NULL byte before saving strings

---
 app/models/application_record.rb | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/app/models/application_record.rb b/app/models/application_record.rb
index 2852279e..ae82f5a8 100644
--- a/app/models/application_record.rb
+++ b/app/models/application_record.rb
@@ -4,6 +4,7 @@ class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
 
   before_validation :strip_strings
+  before_validation :remove_null_bytes
 
   def strip_strings
     # trim whitespace from beginning and end of string attributes
@@ -16,6 +17,15 @@ class ApplicationRecord < ActiveRecord::Base
     end
   end
 
+  def remove_null_bytes
+    # remove null bytes from string attributes
+    attribute_names.each do |name|
+      if send(name.to_sym).respond_to?(:tr)
+        send("#{name}=".to_sym, send(name).tr("\0", ''))
+      end
+    end
+  end
+
   def self.ransackable_associations(_auth_object = nil)
     []
   end