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70 lines
1.9 KiB
70 lines
1.9 KiB
# frozen_string_literal: true
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module Submissions
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class TimestampHandler
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HASH_ALGORITHM = 'SHA256'
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TimestampError = Class.new(StandardError)
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attr_reader :tsa_url, :tsa_fallback_url
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def initialize(tsa_url:)
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@tsa_url, @tsa_fallback_url = tsa_url.split(',')
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end
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def finalize_objects(_signature_field, signature)
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signature.document.version = '2.0'
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signature[:Type] = :DocTimeStamp
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signature[:Filter] = :'Adobe.PPKLite'
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signature[:SubFilter] = :'ETSI.RFC3161'
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end
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# rubocop:disable Metrics
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def sign(io, byte_range)
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digest = OpenSSL::Digest.new(HASH_ALGORITHM)
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io.pos = byte_range[0]
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digest << io.read(byte_range[1])
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io.pos = byte_range[2]
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digest << io.read(byte_range[3])
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uri = Addressable::URI.parse(tsa_url)
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conn = Faraday.new(uri.origin) do |c|
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c.basic_auth(uri.user, uri.password) if uri.password.present?
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end
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response = conn.post(uri.request_uri, build_payload(digest.digest),
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'content-type' => 'application/timestamp-query')
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if response.status != 200 || response.body.blank?
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raise TimestampError if tsa_fallback_url.blank?
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Rollbar.error('TimestampError: use fallback URL') if defined?(Rollbar)
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response = Faraday.post(tsa_fallback_url, build_payload(digest.digest),
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'content-type' => 'application/timestamp-query')
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raise TimestampError if response.status != 200 || response.body.blank?
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end
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OpenSSL::Timestamp::Response.new(response.body).token.to_der
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rescue StandardError => e
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Rollbar.error(e) if defined?(Rollbar)
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Rails.logger.error(e)
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OpenSSL::ASN1::GeneralizedTime.new(Time.now.utc).to_der
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end
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# rubocop:enable Metrics
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def build_payload(digest)
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req = OpenSSL::Timestamp::Request.new
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req.algorithm = HASH_ALGORITHM
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req.message_imprint = digest
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req.to_der
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end
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end
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end
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