Mission Impossible / How to create datatypes which cannot contain invalid state


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In this program, the class AuthenticationProcedure implements the logic for the following passwordless login procedure:

  1. The user goes to the login form
  2. The user enters his email address
  3. The user gets an email with a randomly generated token
  4. The user enters the received token on the login form
  5. The user is logged in

Refactor the example with your newly aqcuired knowledge.

Authentication Procedure
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