1 files changed, 25 insertions, 0 deletions
diff --git a/app/validators/domain_validator.rb b/app/validators/domain_validator.rb
new file mode 100644
index 000000000..6e4a854ff
--- /dev/null
+++ b/app/validators/domain_validator.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class DomainValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    return if value.blank?
+
+    domain = begin
+      if options[:acct]
+        value.split('@').last
+      else
+        value
+      end
+    end
+
+    record.errors.add(attribute, I18n.t('domain_validator.invalid_domain')) unless compliant?(domain)
+  end
+
+  private
+
+  def compliant?(value)
+    Addressable::URI.new.tap { |uri| uri.host = value }
+  rescue Addressable::URI::InvalidURIError, IDN::Idna::IdnaError
+    false
+  end
+end