whmcsZimbraSingle/zimbraAddressAvailable.php

<?php
/**
 * Helper script to check the availibility of a Zimbra mailbox useable with ajax requests
 * 
 * @see https://www.zimbra.com
 * @copyright Copyright (c) Thurdata GmbH 2020
 * @license GPL
 * 
 */


$pos = strpos($_SERVER['HTTP_REFERER'],getenv('HTTP_HOST'));
if($pos===false) {
    die('Restricted access');
}

/**
 * Requires the whmcs init
 * Requires this PHP api to make soap calls and parse responses
 */
require_once(__DIR__ . '/../../../init.php');
require_once(__DIR__ . '/api/Zm/Auth.php');
require_once(__DIR__ . '/api/Zm/Account.php');
use WHMCS\Database\Capsule;

$whmcs = App::self();
$accountName = $_GET['name'] . '@' .  $_GET['domain'];
$productID = $_GET['pid'];
if(!filter_var($accountName, FILTER_VALIDATE_EMAIL)) {
    echo "invalid";
    exit;
}

$accessData = array('zimbraServer' => '', 'adminUser' => '', 'adminPass' => '');
$serverGroupIDObj = Capsule::table('tblproducts')
	->select('servergroup')
	->where('id', '=', $productID)
	->get();
$serverGroupID = $serverGroupIDObj[0]->servergroup;
$serverIDObj = Capsule::table('tblservergroupsrel')
    ->select('serverid')
    ->where('groupid', '=', $serverGroupID)
    ->get();
$serverID = $serverIDObj[0]->serverid;
$server = Capsule::table('tblservers')
	->select('hostname', 'username', 'password')
	->where('id', '=', $serverID)
	->where('active', '=', 1)
	->get();
$accessData['zimbraServer'] = $server[0]->hostname;
$accessData['adminUser'] = $server[0]->username;
$adminPassDecrypt = localAPI('DecryptPassword', array('password2' => $server[0]->password));
if ($adminPassDecrypt['result'] == 'success') {
	$accessData['adminPass'] = $adminPassDecrypt['password'];
}
$api = new Zm_Auth($accessData['zimbraServer'], $accessData['adminUser'], $accessData['adminPass'], 'admin');
$login = $api->login();
if(is_a($login, 'Exception')) {
	logModuleCall(
		'zimbrasingle',
		__FUNCTION__,
		$accessData,
		'Error: cannot login to ' . $accessData['zimbraServer'],
		$login->getMessage()
	);
	exit();
} else {
	$apiAccountManager = new Zm_Account($api);
	if( $apiAccountManager->accountExists($accountName)) {
		echo 'no';
	} else {
		echo 'yes';
	}
}