Fix: create auth file if no exists

src/fw_api.py

@@ -1,9 +1,27 @@
 from src.mpv_control import set_http_header
 import requests, json, time
+import os
 from loguru import logger
 
-with open('.auth.json', 'rt') as f:
+auth_file = '.auth.json'
+if os.path.exists(auth_file):
+    with open('.auth.json', 'rt') as f:
         auth = json.loads(f.read())
+else:
+    # The default umask is 0o22 which turns off write permission of group and others
+    os.umask(0)
+
+    descriptor = os.open(
+        path=auth_file,
+        flags=(
+            os.O_WRONLY  # access mode: write only
+            | os.O_CREAT  # create if not exists
+            | os.O_TRUNC  # truncate the file to zero
+        ),
+        mode=0o600)
+    with open(descriptor, 'wt') as f:
+        f.write('{}')
+        auth = {}
 
 s = requests.Session()
 instance = 'fw.ponychord.rocks'
@@ -24,7 +42,7 @@ else:
 def select_instance(new_instance=None):
     global instance
     instance = new_instance
-    with open('.auth.json', 'rt') as f:
+    with open(auth_file, 'rt') as f:
         auth = json.loads(f.read())
     new_token = auth.get(instance)
     s.headers.update({"Authorization": None,