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# frozen_string_literal: true
module Gitlab
module Graphql
module Authorize
module AuthorizeResource
extend ActiveSupport::Concern
RESOURCE_ACCESS_ERROR = "The resource that you are attempting to access does not exist or you don't have permission to perform this action"
class_methods do
def required_permissions
# If the `#authorize` call is used on multiple classes, we add the
# permissions specified on a subclass, to the ones that were specified
# on it's superclass.
@required_permissions ||= if self.respond_to?(:superclass) && superclass.respond_to?(:required_permissions)
superclass.required_permissions.dup
else
[]
end
end
def authorize(*permissions)
required_permissions.concat(permissions)
end
end
def find_object(*args)
raise NotImplementedError, "Implement #find_object in #{self.class.name}"
end
def authorized_find!(*args, **kwargs)
object = Graphql::Lazy.force(find_object(*args, **kwargs))
authorize!(object)
object
end
def authorize!(object)
unless authorized_resource?(object)
raise_resource_not_available_error!
end
end
# this was named `#authorized?`, however it conflicts with the native
# graphql gem version
# TODO consider adopting the gem's built in authorization system
# https://gitlab.com/gitlab-org/gitlab/issues/13984
def authorized_resource?(object)
# Sanity check. We don't want to accidentally allow a developer to authorize
# without first adding permissions to authorize against
if self.class.required_permissions.empty?
raise Gitlab::Graphql::Errors::ArgumentError, "#{self.class.name} has no authorizations"
end
self.class.required_permissions.all? do |ability|
# The actions could be performed across multiple objects. In which
# case the current user is common, and we could benefit from the
# caching in `DeclarativePolicy`.
Ability.allowed?(current_user, ability, object, scope: :user)
end
end
def raise_resource_not_available_error!
raise Gitlab::Graphql::Errors::ResourceNotAvailable, RESOURCE_ACCESS_ERROR
end
end
end
end
end
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