1 files changed, 38 insertions, 0 deletions
diff --git a/app/validators/abstract_path_validator.rb b/app/validators/abstract_path_validator.rb
new file mode 100644
index 00000000000..adbccb65a84
--- /dev/null
+++ b/app/validators/abstract_path_validator.rb
@@ -0,0 +1,38 @@
+class AbstractPathValidator < ActiveModel::EachValidator
+  extend Gitlab::EncodingHelper
+
+  def self.path_regex
+    raise NotImplementedError
+  end
+
+  def self.format_regex
+    raise NotImplementedError
+  end
+
+  def self.format_error_message
+    raise NotImplementedError
+  end
+
+  def self.full_path(record, value)
+    value
+  end
+
+  def self.valid_path?(path)
+    encode!(path)
+    "#{path}/" =~ path_regex
+  end
+
+  def validate_each(record, attribute, value)
+    unless value =~ self.class.format_regex
+      record.errors.add(attribute, self.class.format_error_message)
+      return
+    end
+
+    full_path = self.class.full_path(record, value)
+    return unless full_path
+
+    unless self.class.valid_path?(full_path)
+      record.errors.add(attribute, "#{value} is a reserved name")
+    end
+  end
+end