DBMS_LDAP equivalent utility in PostgreSQL

Hi All,
We are migrating pl/sql code from Oracle to PostgreSQL. We
have the package DBMS_LDAP in oracle pl/sql code and need to migrate it to
PostgreSQL pl/pgsql. Please let me know if DBMS_LDAP equivalent code/
utility is available in PostgreSQL also.

My second related question is regarding ldap. Do we have any open source
ldap equivalent extension/ utility in PostgreSQL which is supported in AWS
RDS for PostgreSQLtoo? I can use AWS IAM for this purpose but I am looking
for some extension/ open source utility for ldap etc which suffice this
purpose.

Thanks in advance.

Thanks
Mukesh