Merge pull request #232 from jabarihunt/improved-email-validator

Add emailDNS validator

README.md

@@ -121,6 +121,7 @@ V::lang('ar');
  * `notIn` - Negation of `in` rule (not in array of values)
  * `ip` - Valid IP address
  * `email` - Valid email address
+ * `emailDNS` - Valid email address with active DNS record
  * `url` - Valid URL
  * `urlActive` - Valid URL with active DNS record
  * `alpha` - Alphabetic characters only

src/Valitron/Validator.php

@@ -500,6 +500,26 @@ class Validator
         return filter_var($value, \FILTER_VALIDATE_EMAIL) !== false;
     }
 
+    /**
+     * Validate that a field is a valid e-mail address and the domain name is active
+     *
+     * @param  string $field
+     * @param  mixed  $value
+     * @return bool
+     */
+    protected function validateEmailDNS($field, $value)
+    {
+        if ($this->validateEmail($field, $value)) {
+            $domain = ltrim(stristr($value, '@'), '@') . '.';
+            if (function_exists('idn_to_ascii') && defined('INTL_IDNA_VARIANT_UTS46')) {
+                $domain = idn_to_ascii($domain, 0, INTL_IDNA_VARIANT_UTS46);
+            }
+            return checkdnsrr($domain, 'ANY');
+        }
+
+        return false;
+    }
+
     /**
      * Validate that a field is a valid URL by syntax
      *

tests/Valitron/ValidateTest.php

@@ -560,6 +560,18 @@ class ValidateTest extends BaseTestCase
         $this->assertFalse($v->validate());
     }
 
+    public function testEmailDnsValid(){
+        $v = new Validator(array('name' => 'Chester Tester', 'email' => 'chester@tester.com'));
+        $v->rule('emailDNS', 'email');
+        $this->assertTrue($v->validate());
+    }
+
+    public function testEmailDnsInvalid(){
+        $v = new Validator(array('name' => 'Chester Tester', 'email' => 'chester@tester.zyx'));
+        $v->rule('emailDNS', 'email');
+        $this->assertFalse($v->validate());
+    }
+
     public function testUrlValid()
     {
         $v = new Validator(array('website' => 'http://google.com'));