Add Maskable concern for CI variables

This adds a concern that abstracts the concept of masking a variable,
including the RegEx for validation.

2 files changed, 25 insertions, 3 deletions

diff --git a/app/models/concerns/has_variable.rb b/app/models/concerns/has_variable.rb
index dfbe413a878..2ec42a1029b 100644
--- a/app/models/concerns/has_variable.rb
+++ b/app/models/concerns/has_variable.rb
@@ -21,9 +21,9 @@ module HasVariable
     def key=(new_key)
       super(new_key.to_s.strip)
     end
+  end
 
-    def to_runner_variable
-      { key: key, value: value, public: false }
-    end
+  def to_runner_variable
+    { key: key, value: value, public: false }
   end
 end
diff --git a/app/models/concerns/maskable.rb b/app/models/concerns/maskable.rb
new file mode 100644
index 00000000000..8793f0ec965
--- /dev/null
+++ b/app/models/concerns/maskable.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module Maskable
+  extend ActiveSupport::Concern
+
+  # * Single line
+  # * No escape characters
+  # * No variables
+  # * No spaces
+  # * Minimal length of 8 characters
+  # * Absolutely no fun is allowed
+  REGEX = /\A\w{8,}\z/
+
+  included do
+    validates :masked, inclusion: { in: [true, false] }
+    validates :value, format: { with: REGEX }, if: :masked?
+  end
+
+  def to_runner_variable
+    super.merge(masked: masked?)
+  end
+end