1 files changed, 34 insertions, 0 deletions
diff --git a/app/validators/web_hooks/wildcard_branch_filter_validator.rb b/app/validators/web_hooks/wildcard_branch_filter_validator.rb
new file mode 100644
index 00000000000..12ec78f05de
--- /dev/null
+++ b/app/validators/web_hooks/wildcard_branch_filter_validator.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+# WildcardBranchFilterValidator
+#
+# Custom validator for wildcard branch filter. Squishes whitespace and ignores
+# empty string. This only checks that a string is a valid wildcard git branch
+# like "feature/login" and "feature/*". It doesn't check whether a branch already
+# exists.
+#
+# Example:
+#
+#   class Webhook < ActiveRecord::Base
+#     validates :push_events_branch_filter, "web_hooks/wildcard_branch_filter": true
+#   end
+#
+module WebHooks
+  class WildcardBranchFilterValidator < ActiveModel::EachValidator
+    def validate_each(record, attribute, value)
+      value.squish! unless value.nil?
+
+      return unless value.present?
+
+      value_without_wildcards = value.tr('*', 'x')
+
+      unless Gitlab::GitRefValidator.validate(value_without_wildcards)
+        record.errors.add(attribute, "is not a valid branch name")
+      end
+
+      return if value.length <= 4000
+
+      record.errors.add(attribute, "is longer than the allowed length of 4000 characters.")
+    end
+  end
+end