Use injected keycloak token from onyxia in toolbelt auth client

src/dapla/auth.py

@@ -302,13 +302,19 @@ def fetch_google_credentials(force_token_exchange: bool = False) -> Credentials:
 
     @staticmethod
     def fetch_personal_token() -> str:
-        """Fetches the personal access token for the current user."""
-        try:
-            personal_token = AuthClient.fetch_local_user_from_jupyter()["access_token"]
-            return t.cast(str, personal_token)
-        except AuthError as err:
-            err._print_warning()
-            raise err
+        """Retrieve the OIDC token/Keycloak token from the environment.
+
+        Returns:
+            str: The OIDC token.
+
+        Raises:
+            MissingConfigurationException: If the OIDC_TOKEN environment variable is not set.
+        """
+        keycloak_token = os.getenv("OIDC_TOKEN")
+        if not keycloak_token:
+            raise MissingConfigurationException("OIDC_TOKEN")
+        else:
+            return keycloak_token
 
     @staticmethod
     @lru_cache(maxsize=1)
@@ -336,3 +342,23 @@ def _print_warning(self) -> None:
                 )
             )
         )
+
+
+class MissingConfigurationException(Exception):
+    """Exception raised when a required environment variable or configuration is missing."""
+
+    def __init__(self, variable_name: str) -> None:
+        """Initializes a new instance of the MissingConfigurationException class.
+
+        Args:
+        variable_name (str): The name of the missing environment variable or configuration.
+        message (str): The error message to be displayed. Defaults to an empty string.
+
+        """
+        self.variable_name = variable_name
+        self.message = f"Missing required environment variable: {variable_name}"
+        super().__init__(self.message)
+
+    def __str__(self) -> str:
+        """Returns a string representation of the exception."""
+        return f"Configuration error: {self.message}"