From d680c3b0484cf3b0df6de2b4aee0a0ece93a8322 Mon Sep 17 00:00:00 2001
From: Wannaphong Phatthiyaphaibun <wannaphong@yahoo.com>
Date: Sun, 3 Dec 2023 19:01:23 +0700
Subject: [PATCH] Add pythainlp.util.thai_to_idn

---
 docs/api/util.rst          |  5 +++++
 pythainlp/util/__init__.py |  3 ++-
 pythainlp/util/encoding.py | 19 +++++++++++++++++++
 tests/test_util.py         |  4 ++++
 4 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/docs/api/util.rst b/docs/api/util.rst
index 41b635d93..401169feb 100644
--- a/docs/api/util.rst
+++ b/docs/api/util.rst
@@ -218,6 +218,11 @@ Modules
 
     The `thai_to_eng` function is a text conversion tool for translating Thai text into its English transliterated form. This is beneficial for rendering Thai words and phrases in an English context.
 
+.. autofunction:: thai_to_idn
+    :noindex:
+
+    The `thai_to_idn` function is a text conversion tool for translating Thai text into its  International Domain Name (IDN) for Thai domain name.
+
 .. autofunction:: thai_word_tone_detector
     :noindex:
 
diff --git a/pythainlp/util/__init__.py b/pythainlp/util/__init__.py
index 55302507b..5ac977ade 100644
--- a/pythainlp/util/__init__.py
+++ b/pythainlp/util/__init__.py
@@ -62,6 +62,7 @@
     "thai_strptime",
     "thai_strftime",
     "thai_to_eng",
+    "thai_to_idn",
     "thai_word_tone_detector",
     "thaiword_to_date",
     "thaiword_to_num",
@@ -128,7 +129,7 @@
     syllable_open_close_detector,
 )
 from pythainlp.util.phoneme import nectec_to_ipa, ipa_to_rtgs, remove_tone_ipa
-from pythainlp.util.encoding import tis620_to_utf8
+from pythainlp.util.encoding import thai_to_idn, tis620_to_utf8
 from pythainlp.util import spell_words
 from pythainlp.util.abbreviation import abbreviation_to_full_text
 from pythainlp.util.pronounce import rhyme
diff --git a/pythainlp/util/encoding.py b/pythainlp/util/encoding.py
index 91f18f411..3853dbaac 100644
--- a/pythainlp/util/encoding.py
+++ b/pythainlp/util/encoding.py
@@ -29,3 +29,22 @@ def tis620_to_utf8(text: str)->str:
         # output: 'กระทรวงอุตสาหกรรม'
     """
     return text.encode("cp1252", "ignore").decode("tis-620")
+
+
+def thai_to_idn(text: str)->str:
+    """
+    Convert Thai text to International Domain Name (IDN) for Thai domain name.
+
+    :param str text: Thai text
+    :return: Text that uses IDNA encoding
+    :rtype: str
+
+    :Example:
+    ::
+
+        from pythainlp.util import thai_to_idn
+
+        thai_to_idn("คนละครึ่ง.com")
+        # output: 'xn--42caj4e6bk1f5b1j.com'
+    """
+    return text.encode("idna").decode("utf-8")
diff --git a/tests/test_util.py b/tests/test_util.py
index e45319c99..95cf0c87f 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -45,6 +45,7 @@
     thaiword_to_time,
     time_to_thaiword,
     thai_to_eng,
+    thai_to_idn,
     thaiword_to_num,
     thai_keyboard_dist,
     text_to_num,
@@ -780,6 +781,9 @@ def test_syllable_open_close_detector(self):
         self.assertEqual(syllable_open_close_detector("มาก"), "close")
         self.assertEqual(syllable_open_close_detector("คะ"), "open")
 
+    def test_thai_to_idn(self):
+        self.assertEqual(thai_to_idn("คนละครึ่ง.com"), "xn--42caj4e6bk1f5b1j.com")
+
     def test_thai_word_tone_detector(self):
         self.assertIsNotNone(thai_word_tone_detector("คนดี"))
         self.assertEqual(