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verify_uploads_are_usable

headless_lms_server::domain::exercise_services::answer_uploads

Function verify_uploads_are_usable 

Source 
pub fn verify_uploads_are_usable(
    requested: &[Uuid],
    found: &[AnswerUpload],
) -> Result<(), ControllerError>
Expand description

Rejects a submit naming a file the host has no usable upload record of.

Ownership alone would not be enough: without the exercise binding, any of the user’s uploads could be replayed into any other exercise’s submission. A reaped upload is reported distinctly from an unrecognised one, because only the former is a race a client can recover from by uploading again.