Sorry, that is impenetrable ;;; even with a live system to play with
This part
unless ( $class->valid_password($username, $password, $r)) {
unset_cookie($r);
return login_form($r);
}
says show login form unless username/password is valid (like any one of the two is empty)
Then immediately after that the same logic is repeated
Basically you need to contact whomever is supporting this application
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