support UTF-8 email addresses

setup.cfg

@@ -20,6 +20,7 @@ install_requires =
     deltachat-rpc-server
     wkdhash
     requests
+    email-validator
 
 [options.packages.find]
 where = src

src/keyserver_bot/hooks.py

@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
-import re
-
 from deltachat_rpc_client import events, run_bot_cli, EventType, Message
+from email_validator import validate_email, EmailNotValidError
 
 from keyserver_bot.wkd import request_from_wkd
 from keyserver_bot.koo import request_from_koo
@@ -20,8 +19,9 @@ def command(event):
     snapshot = event.message_snapshot
 
     email = snapshot.text
-    regex = r'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$'
-    if not re.match(regex, email):
+    try:
+        validate_email(email, check_deliverability=False)
+    except EmailNotValidError:
         snapshot.chat.send_text(HELP_MSG)
         return
 

tests/test_hooks.py

@@ -1,4 +1,5 @@
 import os
+from email_validator import validate_email, EmailNotValidError
 
 import pytest
 from keyserver_bot.hooks import request_key_by_email, delete_data
@@ -34,3 +35,22 @@ def test_delete_data(acfactory):
     delete_data(msg.get_snapshot())
     assert bot.get_contacts() == []
     assert len(bot.get_chatlist()) == 2
+
+
+@pytest.mark.parametrize(
+    ("email", "valid"),
+    [
+        ("test", False),
+        ("test@example", False),
+        ("@example", False),
+        ("@example.org", False),
+        ("test+asdf@example.org", True),
+        ("test@example.org", True),
+        ("ätsch@ツ.life", True),
+    ]
+)
+def test_validate_email(email, valid):
+    try:
+        validate_email(email, check_deliverability=False)
+    except EmailNotValidError:
+        assert not valid