Key the web_server warning off the OTA platform and tell plaintext uploaders about the offer

tests/component_tests/ota/test_esphome_ota.py

@@ -387,6 +387,47 @@ def test_password_without_static_api_key_no_warning(
         fv.full_config.reset(token)
 
 
+def test_web_server_component_without_ota_platform_does_not_warn(
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """The web_server component alone has no /update endpoint."""
+    full_conf = {
+        "web_server": {},
+        CONF_OTA: [
+            _make_ota_config(port=3232, **{CONF_ENCRYPTION: {CONF_KEY: OTHER_KEY}})
+        ],
+    }
+    token = fv.full_config.set(full_conf)
+    try:
+        with caplog.at_level(logging.WARNING):
+            ota_esphome_final_validate({})
+        assert not any(
+            "OTA encryption does not cover" in r.message for r in caplog.records
+        )
+    finally:
+        fv.full_config.reset(token)
+
+
+def test_web_server_ota_platform_alone_warns(
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """An explicit web_server ota platform exposes /update permanently, with
+    or without the web_server component."""
+    full_conf = {
+        CONF_OTA: [
+            _make_ota_config(port=3232, **{CONF_ENCRYPTION: {CONF_KEY: OTHER_KEY}}),
+            {CONF_PLATFORM: "web_server", CONF_ID: ID("ota_ws", is_manual=False)},
+        ],
+    }
+    token = fv.full_config.set(full_conf)
+    try:
+        with caplog.at_level(logging.WARNING):
+            ota_esphome_final_validate({})
+        assert any("plaintext /update" in r.message for r in caplog.records)
+    finally:
+        fv.full_config.reset(token)
+
+
 def test_web_server_ota_without_encryption_unaffected() -> None:
     """web_server ota stays valid alongside an unencrypted esphome entry."""
     full_conf = {