Can I associate a submitted FormFunction data with a user ( by $WolframID or whatever)?

It can be restricted to the case where "Permissions" to execute are given to the list of users or to "Authenticated" users. E.g.:

 FormFunction[{"first" -> "String"}, $WolframID &]
 Permissions -> {"Authenticated" -> "Execute"}

Here $WolframID will evaluate to the ID of the account where the CloudObject is.

  • 2
    $\begingroup$ What about $RequesterWolframID? $\endgroup$ – C. E. Jun 22 '16 at 14:13
  • $\begingroup$ @C.E. That I have missed. Consider voting to close or posting an answer, up to you :) $\endgroup$ – Kuba Jun 22 '16 at 14:18
  • 3
    $\begingroup$ @Kuba -- For my part I think you've asked a good and useful question. We can't expect everyone to keep the entire contents of the documentation and their applications in their heads. $\endgroup$ – Jagra Jun 22 '16 at 14:49
  • $\begingroup$ @Kuba I didn't know what to do, luckily someone else posted so now it's up to others to decide what to do. $\endgroup$ – C. E. Jun 22 '16 at 18:30

You may be looking for something like:

      If[$RequesterWolframID === None,
         HTTPResponse[ExportForm["Please login ...", "JSON"], <|"StatusCode"->403|> ],
         processformfunctioninput]& ],
    FileNameJoin[{$CloudRootDirectory,"RequireAuthentication"}] ]

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