1 files changed, 37 insertions, 0 deletions
diff --git a/app/validators/branch_filter_validator.rb b/app/validators/branch_filter_validator.rb
new file mode 100644
index 00000000000..6a0899be850
--- /dev/null
+++ b/app/validators/branch_filter_validator.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+# BranchFilterValidator
+#
+# Custom validator for branch names. Squishes whitespace and ignores empty
+# string.  This only checks that a string is a valid git branch name. It does
+# not check whether a branch already exists.
+#
+# Example:
+#
+#   class Webhook < ActiveRecord::Base
+#     validates :push_events_branch_filter, branch_name: true
+#   end
+#
+class BranchFilterValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    value.squish! unless value.nil?
+
+    if value.present?
+      value_without_wildcards = value.tr('*', 'x')
+
+      unless Gitlab::GitRefValidator.validate(value_without_wildcards)
+        record.errors[attribute] << "is not a valid branch name"
+      end
+
+      unless value.length <= 4000
+        record.errors[attribute] << "is longer than the allowed length of 4000 characters."
+      end
+    end
+  end
+
+  private
+
+  def contains_wildcard?(value)
+    value.include?('*')
+  end
+end