Implement User Authentication with Aikotoba

[kei-mag]

Functions

• createNewAikotoba(issuerUserId) -> newAikotobaString || false (busy)
• authenticate(aikotoba) -> isSuccussed
• invalidateAikotoba()

Data

• aikotobaString (String || null)
• expirationTime (DateTime || null)
• issuerUserId (String || null)

Process of authentication

A: user, B: new comer

1. A request to create new aikotoba.
2. A got new aikotoba.
3. A tell aikotoba string to B.
4. B requests authentication
5. System replies "Start authentication. Please send me aikotoba".
   (And adds B to UserData database for state management)
6. B send aikotoba string. If B send correct aikotoba
7. B is added to user list. [END] If B send wrong aikotoba
8. System replies "Your aikotoba is not correct. Please ask user to recreate aikotoba."
9. System variable aikotobaString is set to null.
10. If B resend the same wrong aikotoba.
11. System replies "Your aikotoba is not correct. Please ask user to recreate aikotoba."
    (when aikotobaString==null, system always replies 'not correct.')
12. Back to step 1.