35 lines
876 B
Ruby
35 lines
876 B
Ruby
# frozen_string_literal: true
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class SiretFormatValidator < ActiveModel::EachValidator
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def validate_each(record, attribute, value)
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if !format_is_valid(value)
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record.errors.add(attribute, :length)
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elsif !luhn_passed(value)
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record.errors.add(attribute, :checksum)
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end
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end
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private
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LA_POSTE_SIREN = '356000000'
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def format_is_valid(value)
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value&.match?(/^\d{14}$/)
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end
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def luhn_passed(value)
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# Do not enforce Luhn for La Poste SIRET numbers, the only exception to this rule
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siret_is_attached_to_la_poste(value) || (luhn_checksum(value) % 10 == 0)
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end
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def siret_is_attached_to_la_poste(value)
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value[0..8] == LA_POSTE_SIREN
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end
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def luhn_checksum(value)
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value.reverse.each_char.map(&:to_i).map.with_index do |digit, index|
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t = index.even? ? digit : digit * 2
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t < 10 ? t : t - 9
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end.sum
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end
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end
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