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							28 lines
						
					
					
						
							520 B
						
					
					
				| # frozen_string_literal: true
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| 
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| module EmailVerificationCodes
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|   DRIFT_BEHIND = 5.minutes
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| 
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|   module_function
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| 
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|   def generate(value)
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|     totp = ROTP::TOTP.new(build_totp_secret(value))
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| 
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|     totp.at(Time.current)
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|   end
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| 
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|   def verify(code, value)
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|     totp = ROTP::TOTP.new(build_totp_secret(value))
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| 
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|     totp.verify(code, drift_behind: DRIFT_BEHIND)
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|   end
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| 
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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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