small fixups for Python 3.7 compat

admin/cloud.py

@@ -1,6 +1,7 @@
 import logging
 
 from os import getenv
+from typing import List
 from ipaddress import IPv4Address
 
 from pydantic import UUID4
@@ -34,7 +35,7 @@ def get_ts_instance(tunnel_id: UUID4) -> compute_v1.Instance:
     instance_client = compute_v1.InstancesClient()
     return instance_client.get(project=PROJECT_ID, zone=ZONE, instance=f"{INSTANCE_NAME_PREFIX}-{tunnel_id}")
 
-def list_ts_instances() -> list[compute_v1.Instance]:
+def list_ts_instances() -> List[compute_v1.Instance]:
     """ Lists tunnel server instances. At present, it just uses the 
         INSTANCE_NAME_PREFIX to determine if it is a tunnel server.
     """
@@ -53,7 +54,7 @@ def _create_ts_boot_disk() -> compute_v1.AttachedDisk:
     disk.boot = True
     return disk
 
-def _create_ts_network_interfaces() -> list[compute_v1.NetworkInterface]:
+def _create_ts_network_interfaces() -> List[compute_v1.NetworkInterface]:
     """ create a list of network interface descriptions """
     # create network interface & external access configs
     netiface = compute_v1.NetworkInterface()

api/device.py

@@ -50,7 +50,8 @@ def get_tunnel_id(token: str = Depends(oauth2_scheme)) -> UUID:
     try:
         payload = TunnelRequestTokenData(
             **jwt.decode(token, JWT_SECRET, algorithms=[JWT_ALGO]))
-        tunnel_id_str = payload.sub.removeprefix("tunnel_id:")
+        prefix_len = len("tunnel_id:")
+        tunnel_id_str = payload.sub[prefix_len:]
         logging.debug(f"tunnel_id_str: {tunnel_id_str}")
         tunnel_id = UUID(hex=tunnel_id_str)
     except JWTError: