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38 lines
1.1 KiB
Ruby
38 lines
1.1 KiB
Ruby
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# 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)) != comparable(content) ||
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footprint != Integrity::Checksum.text(comparable(content).to_json)
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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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