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fab-manager/app/models/chained_element.rb
2023-03-24 17:21:44 +01:00

47 lines
1.4 KiB
Ruby

# frozen_string_literal: true
require 'integrity/checksum'
require 'json'
# ChainedElement saves data about a securly footprinted chained element (like invoices)
class ChainedElement < ApplicationRecord
belongs_to :element, polymorphic: true
belongs_to :previous, class_name: 'ChainedElement'
has_one :next, class_name: 'ChainedElement', inverse_of: :previous, dependent: :restrict_with_exception
before_create :set_content, :chain_record
validates :element_id, :element_type, presence: true
# @return [Boolean]
def corrupted?
comparable(FootprintService.chained_data(element, previous&.footprint, columns)) != comparable(content) ||
footprint != Integrity::Checksum.text(comparable(content).to_json)
end
# return ths list of columns in the saved JSON. This is used to do the comparison with the
# saved item, as it may have changed between (some columns may have been added)
# @return [Array<String>]
def columns
%w[id].concat(content.keys.delete_if do |column|
%w[id previous].concat(element.class.columns_out_of_footprint).include?(column)
end.sort)
end
private
def set_content
self.content = FootprintService.chained_data(element, previous&.footprint)
end
def chain_record
self.footprint = Integrity::Checksum.text(content.to_json)
end
# @param item [Hash]
# @return [Hash]
def comparable(item)
item.sort.to_h.transform_values { |val| val.is_a?(Hash) ? val.sort.to_h : val }
end
end