Refactor: use SecretStr for palm chat-model (#15100)

libs/community/langchain_community/chat_models/google_palm.py

@@ -20,8 +20,8 @@ from langchain_core.outputs import (
     ChatGeneration,
     ChatResult,
 )
-from langchain_core.pydantic_v1 import BaseModel, root_validator
-from langchain_core.utils import get_from_dict_or_env
+from langchain_core.pydantic_v1 import BaseModel, SecretStr, root_validator
+from langchain_core.utils import convert_to_secret_str, get_from_dict_or_env
 from tenacity import (
     before_sleep_log,
     retry,
@@ -233,7 +233,7 @@ class ChatGooglePalm(BaseChatModel, BaseModel):
     client: Any  #: :meta private:
     model_name: str = "models/chat-bison-001"
     """Model name to use."""
-    google_api_key: Optional[str] = None
+    google_api_key: Optional[SecretStr] = None
     temperature: Optional[float] = None
     """Run inference with this temperature. Must by in the closed
        interval [0.0, 1.0]."""
@@ -263,13 +263,13 @@ class ChatGooglePalm(BaseChatModel, BaseModel):
     @root_validator()
     def validate_environment(cls, values: Dict) -> Dict:
         """Validate api key, python package exists, temperature, top_p, and top_k."""
-        google_api_key = get_from_dict_or_env(
-            values, "google_api_key", "GOOGLE_API_KEY"
+        google_api_key = convert_to_secret_str(
+            get_from_dict_or_env(values, "google_api_key", "GOOGLE_API_KEY")
         )
         try:
             import google.generativeai as genai
 
-            genai.configure(api_key=google_api_key)
+            genai.configure(api_key=google_api_key.get_secret_value())
         except ImportError:
             raise ChatGooglePalmError(
                 "Could not import google.generativeai python package. "