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