feat: Add function to process the passcmd for API key retrieval.

Author: Gopinath-Mahendiran

zulip/zulip/__init__.py

@@ -425,7 +425,8 @@ def __init__(
             with open(config_file) as f:
                 config.read_file(f, config_file)
             if api_key is None:
-                api_key = config.get("api", "key")
+                passcmd = config.get("api", "passcmd")
+                api_key = self.get_api_key(passcmd)
             if email is None:
                 email = config.get("api", "email")
             if site is None and config.has_option("api", "site"):
@@ -512,6 +513,14 @@ def __init__(
         self.feature_level: int = server_settings.get("zulip_feature_level", 0)
         assert self.zulip_version is not None
 
+    def get_api_key(self, passcmd: str) -> Optional[str]:
+        # run the passcmd command and get the API key
+        result = subprocess.run(passcmd.split(), capture_output=True)
+        if result.returncode == 0:
+            return result.stdout.decode().strip()
+        else:
+            raise RuntimeError("Error: Unable to retrieve API key.")
+
     def ensure_session(self) -> None:
         # Check if the session has been created already, and return
         # immediately if so.