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DN API \| ldapjs

ldapjs DN API

This document covers the ldapjs DN API and assumes that you are familiar with LDAP. If you're not, read the guide first.

DNs are LDAP distinguished names, and are composed of a set of RDNs (relative distinguished names). RFC2253 has the complete specification, but basically an RDN is an attribute value assertion with = as the seperator, like: cn=foo where 'cn' is 'commonName' and 'foo' is the value. You can have compound RDNs by using the + character: cn=foo+sn=bar. As stated above, DNs are a set of RDNs, typically separated with the , character, like: cn=foo, ou=people, o=example. This uniquely identifies an entry in the tree, and is read "bottom up".

parseDN(dnString)

The parseDN API converts a string representation of a DN into an ldapjs DN object; in most cases this will be handled for you under the covers of the ldapjs framework, but if you need it, it's there.

const parseDN = require('ldapjs').parseDN;

const dn = parseDN('cn=foo+sn=bar, ou=people, o=example');
console.log(dn.toString());

DN

The DN object is largely what you'll be interacting with, since all the server APIs are setup to give you a DN object.

childOf(dn)

Returns a boolean indicating whether 'this' is a child of the passed in dn. The dn argument can be either a string or a DN.

server.add('o=example', (req, res, next) => {
  if (req.dn.childOf('ou=people, o=example')) {
    ...
  } else {
    ...
  }
});

parentOf(dn)

The inverse of childOf; returns a boolean on whether or not this is a parent of the passed in dn. Like childOf, can take either a string or a DN.

server.add('o=example', (req, res, next) => {
  const dn = parseDN('ou=people, o=example');
  if (dn.parentOf(req.dn)) {
    ...
  } else {
    ...
  }
});

equals(dn)

Returns a boolean indicating whether this is equivalent to the passed in dn argument. dn can be a string or a DN.

server.add('o=example', (req, res, next) => {
  if (req.dn.equals('cn=foo, ou=people, o=example')) {
    ...
  } else {
    ...
  }
});

parent()

Returns a DN object that is the direct parent of this. If there is no parent this can return null (e.g. parseDN('o=example').parent() will return null).

format(options)

Convert a DN object to string according to specified formatting options. These options are divided into two types. Preservation Options use data recorded during parsing to preserve details of the original DN. Modification options alter string formatting defaults. Preservation options always take precedence over Modification Options.

Preservation Options:

keepOrder: Order of multi-value RDNs.
keepQuote: RDN values which were quoted will remain so.
keepSpace: Leading/trailing spaces will be output.
keepCase: Parsed attribute name will be output instead of lowercased version.

Modification Options:

upperName: RDN names will be uppercased instead of lowercased.
skipSpace: Disable trailing space after RDN separators

setFormat(options)

Sets the default options for string formatting when toString is called. It accepts the same parameters as format.

toString()

Returns the string representation of this.

server.add('o=example', (req, res, next) => {
  console.log(req.dn.toString());
});

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