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							28 lines
						
					
					
						
							520 B
						
					
					
				# frozen_string_literal: true
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module EmailVerificationCodes
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  DRIFT_BEHIND = 5.minutes
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  module_function
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  def generate(value)
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    totp = ROTP::TOTP.new(build_totp_secret(value))
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    totp.at(Time.current)
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  end
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  def verify(code, value)
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    totp = ROTP::TOTP.new(build_totp_secret(value))
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    totp.verify(code, drift_behind: DRIFT_BEHIND)
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  end
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  def build_totp_secret(value)
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    ROTP::Base32.encode(
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      Digest::SHA1.digest(
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        [Rails.application.secret_key_base, value].join(':')
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      )
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    )
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  end
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end
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