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Handling TOTP

#authentication
WestKeys

WestKeys

Handling TOTP

Currently building authentication for a mobile app, and the flow goes as follows:

User inputs phone # > User receives TOTP SMS > User inputs TOTP > User is logged in

Would you store TOTP in DB or in memory (ETS or GenServer)?

17 comments
#authentication
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benwilson512

benwilson512

Author of Craft GraphQL APIs in Elixir with Absinthe

Database. It lets you run multiple versions of your app easily, and if your app goes offline, that doesn’t nuke people’s code.

GenServers / ets are a great way to store ephemeral state or cache values. TOTP codes are short lived but not ephemeral.

7
Post #2
Exadra37

Exadra37

It means that if you store them in memory and your server goes off or restarts before the user receives the TOPT and inputs it, then the application will not recognize the valid TOPT and the user is forced to repeat the process.

4
Post #4
benwilson512

benwilson512

Author of Craft GraphQL APIs in Elixir with Absinthe

Definitely a separate table. You want to track individual issuances of these codes.

3
Post #5

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