242 lines
8.7 KiB
Ruby
242 lines
8.7 KiB
Ruby
# frozen_string_literal: true
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#
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# Cascading attributes enables managing settings in a flexible way.
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#
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# - Instance administrator can define an instance-wide default setting, or
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# lock the setting to prevent change by group owners.
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# - Group maintainers/owners can define a default setting for their group, or
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# lock the setting to prevent change by sub-group maintainers/owners.
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#
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# Behavior:
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#
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# - When a group does not have a value (value is `nil`), cascade up the
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# hierarchy to find the first non-nil value.
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# - Settings can be locked at any level to prevent groups/sub-groups from
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# overriding.
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# - If the setting isn't locked, the default can be overridden.
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# - An instance administrator or group maintainer/owner can push settings values
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# to groups/sub-groups to override existing values, even when the setting
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# is not otherwise locked.
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#
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module CascadingNamespaceSettingAttribute
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extend ActiveSupport::Concern
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include Gitlab::Utils::StrongMemoize
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class_methods do
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private
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# Facilitates the cascading lookup of values and,
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# similar to Rails' `attr_accessor`, defines convenience methods such as
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# a reader, writer, and validators.
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#
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# Example: `cascading_attr :delayed_project_removal`
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#
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# Public methods defined:
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# - `delayed_project_removal`
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# - `delayed_project_removal=`
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# - `delayed_project_removal_locked?`
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# - `delayed_project_removal_locked_by_ancestor?`
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# - `delayed_project_removal_locked_by_application_setting?`
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# - `delayed_project_removal?` (only defined for boolean attributes)
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# - `delayed_project_removal_locked_ancestor` - Returns locked namespace settings object (only namespace_id)
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#
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# Defined validators ensure attribute value cannot be updated if locked by
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# an ancestor or application settings.
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#
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# Requires database columns be present in both `namespace_settings` and
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# `application_settings`.
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def cascading_attr(*attributes)
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attributes.map(&:to_sym).each do |attribute|
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# public methods
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define_attr_reader(attribute)
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define_attr_writer(attribute)
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define_lock_attr_writer(attribute)
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define_lock_methods(attribute)
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alias_boolean(attribute)
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# private methods
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define_validator_methods(attribute)
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define_after_update(attribute)
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validate :"#{attribute}_changeable?"
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validate :"lock_#{attribute}_changeable?"
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after_update :"clear_descendant_#{attribute}_locks", if: -> { saved_change_to_attribute?("lock_#{attribute}", to: true) }
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end
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end
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# The cascading attribute reader method handles lookups
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# with the following criteria:
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#
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# 1. Returns the dirty value, if the attribute has changed.
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# 2. Return locked ancestor value.
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# 3. Return locked instance-level application settings value.
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# 4. Return this namespace's attribute, if not nil.
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# 5. Return value from nearest ancestor where value is not nil.
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# 6. Return instance-level application setting.
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def define_attr_reader(attribute)
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define_method(attribute) do
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strong_memoize(attribute) do
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next self[attribute] if will_save_change_to_attribute?(attribute)
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next locked_value(attribute) if cascading_attribute_locked?(attribute, include_self: false)
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next self[attribute] unless self[attribute].nil?
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cascaded_value = cascaded_ancestor_value(attribute)
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next cascaded_value unless cascaded_value.nil?
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application_setting_value(attribute)
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end
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end
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end
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def define_attr_writer(attribute)
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define_method("#{attribute}=") do |value|
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return value if value == cascaded_ancestor_value(attribute)
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clear_memoization(attribute)
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super(value)
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end
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end
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def define_lock_attr_writer(attribute)
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define_method("lock_#{attribute}=") do |value|
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attr_value = public_send(attribute) # rubocop:disable GitlabSecurity/PublicSend
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write_attribute(attribute, attr_value) if self[attribute].nil?
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super(value)
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end
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end
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def define_lock_methods(attribute)
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define_method("#{attribute}_locked?") do |include_self: false|
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cascading_attribute_locked?(attribute, include_self: include_self)
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end
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define_method("#{attribute}_locked_by_ancestor?") do
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locked_by_ancestor?(attribute)
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end
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define_method("#{attribute}_locked_by_application_setting?") do
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locked_by_application_setting?(attribute)
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end
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define_method("#{attribute}_locked_ancestor") do
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locked_ancestor(attribute)
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end
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end
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def alias_boolean(attribute)
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return unless Gitlab::Database.exists? && type_for_attribute(attribute).type == :boolean
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alias_method :"#{attribute}?", attribute
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end
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# Defines two validations - one for the cascadable attribute itself and one
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# for the lock attribute. Only allows the respective value to change if
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# an ancestor has not already locked the value.
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def define_validator_methods(attribute)
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define_method("#{attribute}_changeable?") do
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return unless cascading_attribute_changed?(attribute)
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return unless cascading_attribute_locked?(attribute, include_self: false)
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errors.add(attribute, s_('CascadingSettings|cannot be changed because it is locked by an ancestor'))
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end
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define_method("lock_#{attribute}_changeable?") do
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return unless cascading_attribute_changed?("lock_#{attribute}")
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if cascading_attribute_locked?(attribute, include_self: false)
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return errors.add(:"lock_#{attribute}", s_('CascadingSettings|cannot be changed because it is locked by an ancestor'))
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end
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# Don't allow locking a `nil` attribute.
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# Even if the value being locked is currently cascaded from an ancestor,
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# it should be copied to this record to avoid the ancestor changing the
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# value unexpectedly later.
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return unless self[attribute].nil? && public_send("lock_#{attribute}?") # rubocop:disable GitlabSecurity/PublicSend
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errors.add(attribute, s_('CascadingSettings|cannot be nil when locking the attribute'))
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end
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private :"#{attribute}_changeable?", :"lock_#{attribute}_changeable?"
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end
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# When a particular group locks the attribute, clear all sub-group locks
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# since the higher lock takes priority.
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def define_after_update(attribute)
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define_method("clear_descendant_#{attribute}_locks") do
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self.class.where(namespace_id: descendants).update_all("lock_#{attribute}" => false)
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end
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private :"clear_descendant_#{attribute}_locks"
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end
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end
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private
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def locked_value(attribute)
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ancestor = locked_ancestor(attribute)
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return ancestor.read_attribute(attribute) if ancestor
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Gitlab::CurrentSettings.public_send(attribute) # rubocop:disable GitlabSecurity/PublicSend
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end
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def locked_ancestor(attribute)
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return unless namespace.has_parent?
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strong_memoize(:"#{attribute}_locked_ancestor") do
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self.class
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.select(:namespace_id, "lock_#{attribute}", attribute)
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.where(namespace_id: namespace_ancestor_ids)
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.where(self.class.arel_table["lock_#{attribute}"].eq(true))
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.limit(1).load.first
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end
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end
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def locked_by_ancestor?(attribute)
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locked_ancestor(attribute).present?
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end
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def locked_by_application_setting?(attribute)
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Gitlab::CurrentSettings.public_send("lock_#{attribute}") # rubocop:disable GitlabSecurity/PublicSend
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end
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def cascading_attribute_locked?(attribute, include_self:)
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locked_by_self = include_self ? public_send("lock_#{attribute}?") : false # rubocop:disable GitlabSecurity/PublicSend
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locked_by_self || locked_by_ancestor?(attribute) || locked_by_application_setting?(attribute)
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end
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def cascading_attribute_changed?(attribute)
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public_send("#{attribute}_changed?") # rubocop:disable GitlabSecurity/PublicSend
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end
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def cascaded_ancestor_value(attribute)
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return unless namespace.has_parent?
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# rubocop:disable GitlabSecurity/SqlInjection
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self.class
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.select(attribute)
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.joins("join unnest(ARRAY[#{namespace_ancestor_ids.join(',')}]) with ordinality t(namespace_id, ord) USING (namespace_id)")
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.where("#{attribute} IS NOT NULL")
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.order('t.ord')
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.limit(1).first&.read_attribute(attribute)
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# rubocop:enable GitlabSecurity/SqlInjection
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end
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def application_setting_value(attribute)
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Gitlab::CurrentSettings.public_send(attribute) # rubocop:disable GitlabSecurity/PublicSend
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end
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def namespace_ancestor_ids
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strong_memoize(:namespace_ancestor_ids) do
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namespace.ancestor_ids(hierarchy_order: :asc)
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end
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end
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def descendants
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strong_memoize(:descendants) do
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namespace.descendants.pluck(:id)
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end
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end
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end
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