Month: April 2017

11 Apr

Domain verification using Let’s Encrypt DNS Challenge Type (dns-01)

From the link, we will get a nice script to create SSL Certificates. The script has code to verify domain after uploading a file to a folder .well-known/acme-challenge in the document root. If the domain is not yet hosted , we have to verify the domain using DNS TXT record.

This post explains about domain verification using DNS method.

First of all download the script from the link
Then we can use most of it’s code for domain verification using DNS too.

We have to use response we get for

$response = $this->signedRequest(
                    "/acme/new-authz", array("resource" => "new-authz",
                "identifier" => array("type" => "dns", "value" => $domain)

This array will have challenge details for domain verification using http, dns etc.

To get dns challenge details, use the below code

$dns_challenge = array_reduce($response['challenges'], function ($v, $w) use (&$self) {
                return $v ? $v : ($w['type'] == "dns-01" ? $w : false);

From the dns challenge we can collect token and key authorization.

$dns_token = $dns_challenge['token'];

$dns_payload = $dns_token . '.' 
                    . Base64UrlSafeEncoder::encode(hash('sha256', json_encode($header), true));

You can see that token and key authorization are creating just like we create for http-01. Now the main difference is, how we calculate the DNS TXT Record.

For domain verification using http-01, we create a file named
and we put the payload as content of the file.

But for dns-01 domain verification, we are not adding TXT value as payload, but we calculate a string by below code.

// name of the domain
$name = '_acme-challenge'. $domain;

//points to
$dns_txt_record = Base64UrlSafeEncoder::encode(hash('sha256',$dns_payload, true));

Then we have to add $name and $dns_txt_record to the dns zone TXT record.
We can check weather the value is added correctly or not by typing below command in terminal.

dig txt _acme-challenge.[domain]

Then we can invoke the domain verification using dns-01 type.

$result = $this->signedRequest_dns(
                $challenge_uri, array(
            "resource" => "challenge",
            "type" => "dns-01",
            "keyAuthorization" => $dns_payload,
            "token" => $dns_token

If anybody need more explanation or help, please do post comments.
Will answer asap.

3 Apr

WHMCS 6 Addon Module Development Using Smarty

Main aim of this post is not to discuss all steps of WHMCS addon module development. We are discussing two points that are not well explained in many blogs.

1)How to create and delete tables using new WHMCS database component. As full_query is deprecated, we have to use Illuminate Database. This post explains how to do table creation and deletion using WHMCS Illuminate Database.

2)When creating WHMCS addon without using Smarty, We are making html code complicated with mix of single and double quotes. So in this post we are discussing how to write HTML content using Smarty.

Assume that we have to develop an addon with name ‘example’. Steps to create the addon module is explained below.

1)create a folder named `example`.
In the folder create two files.

Also create folders named `lang` and `templates`

2)Now let’s open the file example.php and add the below code.


if (!defined("WHMCS"))
    die("This file cannot be accessed directly");

use Illuminate\Database\Capsule\Manager as Capsule;

   function example_config() {
    $configarray = array(
        "name" => "Sample Addon",
        "description" => "Sample Addon is just an addon to explain you",
        "version" => "1.0",
        "author" => "WHMCSTools",
        "language" => "english",

    return $configarray;

//Table is creating here
function example_activate() {
   if (!Capsule::schema()->hasTable('sample_table')) {
        Capsule::schema()->create('sample_table', function($table) {
            $table->string('name', 100);
            $table->float('amount', 8, 2);

    return array('status' => 'success', 'description' => 'Module activated');
function example_deactivate() {

    return array('status' => 'success', 'description' => 'Module deactivated');


function example_output($vars) {

function example_clientarea($vars) {

3)Now we can write what we have to display in admin side of the module
in the function example_output() {.

For example we can define the function as

function example_output($vars) {
   echo '<p>The date & time are currently ' . date("Y-m-d H:i:s") . '</p>';

But if we have much more HTML content to display, we have to create a big string and then echo it. Better way to display the HTML content is using a Smarty file.

For that let’s create a file named time.tpl in the folder templates.
Let’s discuss the template usage with the same simple content. But we can extend that for complex contents too.

Content of the tpl file is

 <p>The date & time are currently {$date}</p>

Now let’s discuss how to use the tpl from the example_output function.

 function example_output($vars) {
   $smarty = new Smarty();
   $smarty->assign('date', date("Y-m-d H:i:s") );
   $smarty->caching = false;
   $smarty->compile_dir = $GLOBALS['templates_compiledir'];
   $smarty->display(dirname(__FILE__) . '/templates/time.tpl');