Revoke authentication tokens when a user is deleted

app/models/user.rb

@@ -210,6 +210,7 @@ class User < ApplicationRecord
     # Mark the account as deleted and remove personal data
     event :soft_destroy do
       before do
+        revoke_authentication_tokens
         remove_personal_data
       end
 
@@ -299,6 +300,13 @@ class User < ApplicationRecord
     blocks.active.detect(&:needs_view?)
   end
 
+  ##
+  # revoke any authentication tokens
+  def revoke_authentication_tokens
+    oauth_tokens.authorized.each(&:invalidate!)
+    access_tokens.not_expired.each(&:revoke)
+  end
+
   ##
   # remove personal data - leave the account but purge most personal data
   def remove_personal_data