(oidc): Add support for loading tokens via a file, environment variable, and from a file path set in an env var.

litellm/utils.py

@@ -8433,6 +8433,25 @@ def get_secret(
             with open(azure_federated_token_file, "r") as f:
                 oidc_token = f.read()
                 return oidc_token
+        elif oidc_provider == "file":
+            # Load token from a file
+            with open(oidc_aud, "r") as f:
+                oidc_token = f.read()
+                return oidc_token
+        elif oidc_provider == "env":
+            # Load token directly from an environment variable
+            oidc_token = os.getenv(oidc_aud)
+            if oidc_token is None:
+                raise ValueError(f"Environment variable {oidc_aud} not found")
+            return oidc_token
+        elif oidc_provider == "env_path":
+            # Load token from a file path specified in an environment variable
+            token_file_path = os.getenv(oidc_aud)
+            if token_file_path is None:
+                raise ValueError(f"Environment variable {oidc_aud} not found")
+            with open(token_file_path, "r") as f:
+                oidc_token = f.read()
+                return oidc_token
         else:
             raise ValueError("Unsupported OIDC provider")