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administrator/components/com_convertforms/ConvertForms/Validate.php

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+<?php
+
+/**
+ * @package         Convert Forms
+ * @version         3.2.12 Free
+ * 
+ * @author          Tassos Marinos <info@tassos.gr>
+ * @link            http://www.tassos.gr
+ * @copyright       Copyright © 2020 Tassos Marinos All Rights Reserved
+ * @license         GNU GPLv3 <http://www.gnu.org/licenses/gpl.html> or later
+*/
+
+namespace ConvertForms;
+
+// No direct access to this file
+defined('_JEXEC') or die;
+
+class Validate
+{
+	/**
+	 *  Check if given email address is valid
+	 *
+	 *  @param   String  $email  The email address to check
+	 *
+	 *  @return  Boolean         Return true if the email address is valid
+	 */
+	public static function email($email)
+	{
+		return filter_var($email, FILTER_VALIDATE_EMAIL);
+	}
+	
+	/**
+	 *  Check DNS records corresponding to a given email address
+	 *
+	 *  @param   String  $email  The email address to check
+	 *
+	 *  @return  Boolean         Return true if the email address has valid MX records
+	 */
+	public static function emaildns($email)
+	{
+		// Check if it's an email address format
+		if (!self::email($email))
+		{
+			return false;
+		}
+
+		list($user, $domain) = explode('@', $email, 2);
+		
+		// checkdnsrr for PHP < 5.3.0
+		if (!function_exists('checkdnsrr') && function_exists('exec') && is_callable('exec'))
+		{
+			@exec('nslookup -type=MX ' . escapeshellcmd($domain), $output);
+
+			foreach($output as $line)
+			{
+				if (preg_match('/^' . preg_quote($domain) . '/', $line))
+				{
+					return true;
+				}
+			}
+			
+			return false;
+		}
+
+		// fallback method...
+		if (!function_exists('checkdnsrr') || !is_callable('checkdnsrr'))
+		{
+			return true;
+		}
+
+		return checkdnsrr($domain, substr(PHP_OS, 0, 3) == 'WIN' ? 'A' : 'MX');
+	}
+
+	/**
+	 *  Validates the given date. 
+	 * 
+	 *  Note: This method is limited to validate only english-based dates 
+	 *  as the Date PHP class doesn't respect current locale without using hacks
+	 *
+	 *  @param   String  $date    The date string
+	 *  @param   String  $format  The date format to be used
+	 *
+	 *  @return  boolean
+	 */
+	public static function dateFormat($date, $format = null)
+	{
+		return \JDate::createFromFormat($format, trim($date));
+	}
+
+	/**
+	 * Validates URL
+	 *
+	 * @param	string	$url
+	 *
+	 * @return	void
+	 */
+	public static function url($url)
+	{
+		return filter_var($url, FILTER_VALIDATE_URL);
+	}
+}