ldap_client.js

// Pass in username, password as normal
// customLdapOptions should be passed in if you want to override LDAP_DEFAULTS
// on any particular call (if you have multiple ldap servers you'd like to connect to)
// You'll likely want to set the dn value here {dn: "..."}
Meteor.loginWithLDAP = function (user, password, customLdapOptions, callback) {
    // Retrieve arguments as array
    var args = [];
    for (var i = 0; i < arguments.length; i++) {
        args.push(arguments[i]);
    }
    // Pull username and password
    user = args.shift();
    password = args.shift();

    // Check if last argument is a function
    // if it is, pop it off and set callback to it
    if (typeof args[args.length - 1] == 'function') callback = args.pop(); else callback = null;

    // if args still holds options item, grab it
    if (args.length > 0) customLdapOptions = args.shift(); else customLdapOptions = {};

    // Set up loginRequest object
    var loginRequest = _.defaults({
        username: user,
        ldapPass: password
    }, {
        ldap: true,
        ldapOptions: customLdapOptions
    });

    Accounts.callLoginMethod({
        // Call login method with ldap = true
        // This will hook into our login handler for ldap
        methodArguments: [loginRequest],
        userCallback: function (error, result) {
            if (error) {
                callback && callback(error);
            } else {
                callback && callback();
            }
        }
    });
};