Закрыты задачи бэклога по неочевидному поведению UI при ошибках отправки сообщений и блокировках со стороны Message-safety + добалено ограничение на размер сообщения

codebase/backend/api-backend/app/chat_settings.py

@@ -0,0 +1,21 @@
+from collections.abc import Mapping
+
+CHAT_MESSAGE_MAX_LENGTH_KEY = "chat.message.max_length"
+CHAT_MESSAGE_TRANSPORT_MAX_LENGTH = 10_000
+
+
+def validate_chat_settings(values: Mapping[str, str]) -> None:
+    raw = values.get(CHAT_MESSAGE_MAX_LENGTH_KEY)
+    if raw is None:
+        return
+    try:
+        value = int(raw)
+    except (TypeError, ValueError) as error:
+        raise ValueError(f"{CHAT_MESSAGE_MAX_LENGTH_KEY}: integer value expected") from error
+    if str(value) != raw:
+        raise ValueError(f"{CHAT_MESSAGE_MAX_LENGTH_KEY}: canonical integer value expected")
+    if not 1 <= value <= CHAT_MESSAGE_TRANSPORT_MAX_LENGTH:
+        raise ValueError(
+            f"{CHAT_MESSAGE_MAX_LENGTH_KEY}: value must be between 1 "
+            f"and {CHAT_MESSAGE_TRANSPORT_MAX_LENGTH}"
+        )