api + LDAP: use api with LDAP credentials

Currently api may be accessed only with generated API key.

I have a program that has to get list of passwords from TP.
Passwords have to be retrieved according to LDAP users.

That is: LDAP user "andrey" has access to "Item1" and "Item2", and NOT to "Item3".

1) I can't create new api key for each user

2) I can't give user the master key to all passwords

The feature request: allow api to authenticate with users+users from LDAP