support for FQDN conversion

src/Punycode.php

@@ -77,15 +77,27 @@ public function __construct($encoding = 'UTF-8')
     public function encode($input)
     {
         $input = mb_strtolower($input, $this->encoding);
+
+        $isFQDN = false;
+        if (substr($input, -1) === '.') {
+            $isFQDN = true;
+            $input = substr($input, 0, -1);
+        }
         $parts = explode('.', $input);
+
         foreach ($parts as &$part) {
             $length = strlen($part);
             if ($length < 1) {
                 throw new LabelOutOfBoundsException(sprintf('The length of any one label is limited to between 1 and 63 octets, but %s given.', $length));
             }
             $part = $this->encodePart($part);
         }
+
         $output = implode('.', $parts);
+        if ($isFQDN) {
+            $output .= '.';
+        }
+
         $length = strlen($output);
         if ($length > 255) {
             throw new DomainOutOfBoundsException(sprintf('A full domain name is limited to 255 octets (including the separators), %s given.', $length));
@@ -176,7 +188,14 @@ protected function encodePart($input)
     public function decode($input)
     {
         $input = strtolower($input);
+
+        $isFQDN = false;
+        if (substr($input, -1) === '.') {
+            $isFQDN = true;
+            $input = substr($input, 0, -1);
+        }
         $parts = explode('.', $input);
+
         foreach ($parts as &$part) {
             $length = strlen($part);
             if ($length > 63 || $length < 1) {
@@ -190,6 +209,9 @@ public function decode($input)
             $part = $this->decodePart($part);
         }
         $output = implode('.', $parts);
+        if ($isFQDN) {
+            $output .= '.';
+        }
         $length = strlen($output);
         if ($length > 255) {
             throw new DomainOutOfBoundsException(sprintf('A full domain name is limited to 255 octets (including the separators), %s given.', $length));

tests/PunycodeTest.php

@@ -150,6 +150,10 @@ public function domainNamesProvider()
                 'άέήίΰαβγδεζηθικλμνξοπρσστυφχ.com',
                 'xn--hxacdefghijklmnopqrstuvw0caz0a1a2a.com'
             ),
+            array(
+                '你好.世界.',
+                'xn--6qq79v.xn--rhqv96g.'
+            ),
         );
     }
 
@@ -201,6 +205,12 @@ public function invalidUtf8DomainNamesProvider()
                 '\TrueBV\Exception\LabelOutOfBoundsException',
                 'The length of any one label is limited to between 1 and 63 octets, but 0 given.',
             ),
+            array(
+                '你好.世界..',
+                '\TrueBV\Exception\LabelOutOfBoundsException',
+                'The length of any one label is limited to between 1 and 63 octets, but 0 given.',
+            ),
+
 
         );
     }
@@ -253,6 +263,11 @@ public function invalidAsciiDomainNameProvider()
                 '\TrueBV\Exception\DomainOutOfBoundsException',
                 'A full domain name is limited to 255 octets (including the separators), 256 given.',
             ),
+            array(
+                'xn--6qq79v.xn--rhqv96g..',
+                '\TrueBV\Exception\LabelOutOfBoundsException',
+                'The length of any one label is limited to between 1 and 63 octets, but 0 given.',
+            ),
         );
     }
 }