Add the user's browser languages in the user session (Chainlit#889)

Author: tpatel

backend/chainlit/session.py

@@ -163,6 +163,8 @@ def __init__(
         root_message: Optional["Message"] = None,
         # Chat profile selected before the session was created
         chat_profile: Optional[str] = None,
+        # Languages of the user's browser
+        languages: Optional[str] = None,
     ):
         super().__init__(
             id=id,
@@ -188,6 +190,8 @@ def __init__(
         ws_sessions_id[self.id] = self
         ws_sessions_sid[socket_id] = self
 
+        self.languages = languages
+
     @property
     def files_dir(self):
         from chainlit.config import FILES_DIRECTORY

backend/chainlit/socket.py

@@ -147,6 +147,7 @@ def emit_call_fn(event: Literal["ask", "call_fn"], data, timeout):
         token=token,
         chat_profile=environ.get("HTTP_X_CHAINLIT_CHAT_PROFILE"),
         thread_id=environ.get("HTTP_X_CHAINLIT_THREAD_ID"),
+        languages=environ.get("HTTP_ACCEPT_LANGUAGE"),
     )
 
     trace_event("connection_successful")

backend/chainlit/user_session.py

@@ -27,6 +27,7 @@ def get(self, key, default=None):
         user_session["chat_settings"] = context.session.chat_settings
         user_session["user"] = context.session.user
         user_session["chat_profile"] = context.session.chat_profile
+        user_session["languages"] = context.session.languages
 
         if context.session.root_message:
             user_session["root_message"] = context.session.root_message