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# frozen_string_literal: true
module Gitlab
module Ci
class Config
class Extendable
class Entry
InvalidExtensionError = Class.new(Extendable::ExtensionError)
CircularDependencyError = Class.new(Extendable::ExtensionError)
NestingTooDeepError = Class.new(Extendable::ExtensionError)
MAX_NESTING_LEVELS = 10
attr_reader :key
def initialize(key, context, parent = nil)
@key = key
@context = context
@parent = parent
unless @context.key?(@key)
raise StandardError, _('Invalid entry key!')
end
end
def extensible?
value.is_a?(Hash) && value.key?(:extends)
end
def value
@value ||= @context.fetch(@key)
end
def base_hash!
@base ||= Extendable::Entry
.new(extends_key, @context, self)
.extend!
end
def extends_key
value.fetch(:extends).to_s.to_sym if extensible?
end
def ancestors
@ancestors ||= Array(@parent&.ancestors) + Array(@parent&.key)
end
def extend!
return value unless extensible?
if unknown_extension?
raise Entry::InvalidExtensionError,
"#{key}: unknown key in `extends`"
end
if invalid_base?
raise Entry::InvalidExtensionError,
"#{key}: invalid base hash in `extends`"
end
if nesting_too_deep?
raise Entry::NestingTooDeepError,
"#{key}: nesting too deep in `extends`"
end
if circular_dependency?
raise Entry::CircularDependencyError,
"#{key}: circular dependency detected in `extends`"
end
@context[key] = base_hash!.deep_merge(value)
end
private
def nesting_too_deep?
ancestors.count > MAX_NESTING_LEVELS
end
def circular_dependency?
ancestors.include?(key)
end
def unknown_extension?
!@context.key?(extends_key)
end
def invalid_base?
!@context[extends_key].is_a?(Hash)
end
end
end
end
end
end
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