How to implement this in nodejs?

I am new to nodejs and working on a proof of concept just for fun.

Background: I have a cloud directory of user information (like username, password and other info). This cloud directory can be used to authenticate a user only via restful API (i.e. no direct connectivity using LDAP or JDBC etc.).

Aim: To build an LDAP interface for this cloud directory. To start with I am interested only in authentication (LDAP bind).

Intended Flow:

1. LDAPClient initiates a standard LDAP simple BIND request: Host: host where my nodejs app will run Port: 1389 (port that my nodejs app will be bound to) Username: a user from cloud directory Password: user's password

2. This request is received by my NodeJS app (I am using ldapjs module).

   // process ldap bind operation
   myLdapServer.bind(searchBase, function (bindReq, bindRes, next) {
     // bind creds
     var userDn = req.dn.toString();
     var userPw = req.credentials;
     console.log('bind DN: ' + req.dn.toString());
   ...
   ...
   }
   
   

3. Within the above callback, I must use http.request to fire a restful API (POST) to the cloud directory with the details I received from the BIND request (i.e. username, password).

4. If restful api response status is 200 (auth success), then I must return success to the LDAPClient, else I must return invalid credentials error.

Success:

    bindRes.end();
    return next();

Failure:

    Console.log("returning error");
    return next(new ldap.InvalidCredentialsError());

Questions:

Is this possible using NodeJS? Asking because of the nesting involved as evident above (calling of REST API from within a callback). Also since this is an authentication operation, this is meant to be a blocking operation(?)

Thanks, Jatin

via Jatin