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                            # Below are snippets from an authentication script used by the Gluu Server to enforce two-factor authentication (2FA) using Duo Security.

import duo_web
import json

        if (step == 1):
            print "Duo. Authenticate for step 1"

            credentials = identity.getCredentials()
            user_name = credentials.getUsername()
            user_password = credentials.getPassword()

            logged_in = False
            if (StringHelper.isNotEmptyString(user_name) and StringHelper.isNotEmptyString(user_password)):
                userService = CdiUtil.bean(UserService)
                logged_in = authenticationService.authenticate(user_name, user_password)

            if (not logged_in):
                return False

            user = authenticationService.getAuthenticatedUser()
            if (self.use_duo_group):
                print "Duo. Authenticate for step 1. Checking if user belong to Duo group"
                is_member_duo_group = self.isUserMemberOfGroup(user, self.audit_attribute, self.duo_group)
                if (is_member_duo_group):
                    print "Duo. Authenticate for step 1. User '" + user.getUserId() + "' member of Duo group"
                    duo_count_login_steps = 2
                else:
                    self.processAuditGroup(user)
                    duo_count_login_steps = 1

                identity.setWorkingParameter("duo_count_login_steps", duo_count_login_steps)

            return True
        elif (step == 2):
            print "Duo. Authenticate for step 2"
            user = authenticationService.getAuthenticatedUser()
            if user == None:
                print "Duo. Authenticate for step 2. Failed to determine user name"
                return False

            user_name = user.getUserId()

            sig_response_array = requestParameters.get("sig_response")
            if ArrayHelper.isEmpty(sig_response_array):
                print "Duo. Authenticate for step 2. sig_response is empty"
                return False

            duo_sig_response = sig_response_array[0]

        if (step == 1):
            print "Duo. Prepare for step 1"

            return True
        elif (step == 2):
            print "Duo. Prepare for step 2"

            user = authenticationService.getAuthenticatedUser()
            if (user == None):
                print "Duo. Prepare for step 2. Failed to determine user name"
                return False
            user_name = user.getUserId()

            duo_sig_request = duo_web.sign_request(self.ikey, self.skey, self.akey, user_name)
            print "Duo. Prepare for step 2. duo_sig_request: " + duo_sig_request
            
            identity.setWorkingParameter("duo_host", duo_host)
            identity.setWorkingParameter("duo_sig_request", duo_sig_request)

            return True
        else:
            return False

    def getExtraParametersForStep(self, configurationAttributes, step):
        return None

    def getCountAuthenticationSteps(self, configurationAttributes):
        identity = CdiUtil.bean(Identity)
        if (identity.isSetWorkingParameter("duo_count_login_steps")):
            return identity.getWorkingParameter("duo_count_login_steps")

        return 2

    def getPageForStep(self, configurationAttributes, step):
        if (step == 2):
            return "/auth/duo/duologin.xhtml"
        return ""

    def logout(self, configurationAttributes, requestParameters):
        return True

    def isUserMemberOfGroup(self, user, attribute, group):
        is_member = False
        member_of_list = user.getAttributeValues(attribute)
        if (member_of_list != None):
            for member_of in member_of_list:
                if StringHelper.equalsIgnoreCase(group, member_of) or member_of.endswith(group):
                    is_member = True
                    break

        return is_member

    def processAuditGroup(self, user):
        if (self.use_audit_group):
            is_member = self.isUserMemberOfGroup(user, self.audit_attribute, self.audit_group)
            if (is_member):
                print "Duo. Authenticate for processAuditGroup. User '" + user.getUserId() + "' member of audit group"
                print "Duo. Authenticate for processAuditGroup. Sending e-mail about user '" + user.getUserId() + "' login to", self.audit_email
                
                # Send e-mail to administrator
                user_id = user.getUserId()
                mailService = CdiUtil.bean(MailService)
                subject = "User log in: " + user_id
                body = "User log in: " + user_id
                mailService.sendMail(self.audit_email, subject, body)