Public registration with validation in existing tokens list

Hi,

We have a use case for internal eVoting which would require to validate a user before creating and sending a token.

So for instance, we would:

- upload a list of eligible users (email addresses)

- publish the survey with the public registration feature enabled

- then when a user registers the system will validate it against the list of eligible users

- if the user is in the list, the email with the token information will be sent to the user

- if the user is not in the list, an email proposing to contact the administrator will be sent to the user


Could this be done with a plugin? (we could pay for that

Thanks,
Lo

Thanks for your reply @holch and sorry to follow up only now...

Potential users are thousands while respondents may be hundreds so we wanted to avoid the creation of token for everybody when we know that only a percentage will submit an answer.
This feature already exists partially in LimeSurvey with the "Allow public registration" but our use case requires a validation before creating a token for the requestor.
That's why I thought it would not be too much work to have a plugin doing that but apparently not...