[PY312] Add support for ssl.OP_LEGACY_SERVER_CONNECT (#2489)

ChangeLog

@@ -19,6 +19,9 @@ Release date: TBA
 
 * Implement inference for JoinedStr and FormattedValue
 
+* Add support for ``ssl.OP_LEGACY_SERVER_CONNECT`` (new in Python 3.12).
+
+  Closes pylint-dev/pylint#9849
 
 
 What's New in astroid 3.2.5?

astroid/brain/brain_ssl.py

@@ -6,7 +6,7 @@
 
 from astroid import parse
 from astroid.brain.helpers import register_module_extender
-from astroid.const import PY310_PLUS
+from astroid.const import PY310_PLUS, PY312_PLUS
 from astroid.manager import AstroidManager
 
 
@@ -42,13 +42,16 @@ class Options(_IntFlag):
         OP_NO_COMPRESSION = 11
         OP_NO_TICKET = 12
         OP_NO_RENEGOTIATION = 13
-        OP_ENABLE_MIDDLEBOX_COMPAT = 14"""
+        OP_ENABLE_MIDDLEBOX_COMPAT = 14
+        """
+    if PY312_PLUS:
+        enum += "OP_LEGACY_SERVER_CONNECT = 15"
     return enum
 
 
 def ssl_transform():
     return parse(
-        """
+        f"""
     # Import necessary for conversion of objects defined in C into enums
     from enum import IntEnum as _IntEnum, IntFlag as _IntFlag
 
@@ -71,6 +74,8 @@ def ssl_transform():
                       OP_NO_TLSv1, OP_NO_TLSv1_1, OP_NO_TLSv1_2,
                       OP_SINGLE_DH_USE, OP_SINGLE_ECDH_USE)
 
+    {"from _ssl import OP_LEGACY_SERVER_CONNECT" if PY312_PLUS else ""}
+
     from _ssl import (ALERT_DESCRIPTION_ACCESS_DENIED, ALERT_DESCRIPTION_BAD_CERTIFICATE,
                       ALERT_DESCRIPTION_BAD_CERTIFICATE_HASH_VALUE,
                       ALERT_DESCRIPTION_BAD_CERTIFICATE_STATUS_RESPONSE,

tests/brain/test_ssl.py

@@ -4,7 +4,10 @@
 
 """Tests for the ssl brain."""
 
+import pytest
+
 from astroid import bases, nodes, parse
+from astroid.const import PY312_PLUS
 
 
 def test_ssl_brain() -> None:
@@ -41,3 +44,21 @@ def test_ssl_brain() -> None:
     inferred_cert_required = next(module.body[4].value.infer())
     assert isinstance(inferred_cert_required, bases.Instance)
     assert inferred_cert_required._proxied.name == "CERT_REQUIRED"
+
+
+@pytest.mark.skipif(not PY312_PLUS, reason="Uses new 3.12 constant")
+def test_ssl_brain_py312() -> None:
+    """Test ssl brain transform."""
+    module = parse(
+        """
+    import ssl
+    ssl.OP_LEGACY_SERVER_CONNECT
+    ssl.Options.OP_LEGACY_SERVER_CONNECT
+    """
+    )
+
+    inferred_constant = next(module.body[1].value.infer())
+    assert isinstance(inferred_constant, nodes.Const)
+
+    inferred_instance = next(module.body[2].value.infer())
+    assert isinstance(inferred_instance, bases.Instance)