redid some code

web/cgi-bin/backupbot.cgi

@@ -3,30 +3,32 @@ import cgi
 import cgitb
 import os
 import json
+from pathlib import Path
 
 cgitb.enable()
-print("Content-Type: application/json\n")
 
-ENV_FILE = "/config/backupbot.env"
+ENV_FILE = Path("/config/backupbot.env")
+print("Content-Type: application/json\n")
 
 
 def read_env():
     env = {}
-    if os.path.exists(ENV_FILE):
-        with open(ENV_FILE) as f:
+    if ENV_FILE.exists():
+        with ENV_FILE.open() as f:
             for line in f:
                 line = line.strip()
                 if not line or line.startswith("#") or "=" not in line:
                     continue
                 key, val = line.split("=", 1)
-                key = key.strip()
-                val = val.strip().split("#")[0].strip()  # strip inline comments
-                env[key] = val
+                env[key.strip()] = val.strip().split("#")[0].strip()
     return env
 
 
 def write_env(env):
-    with open(ENV_FILE, "w") as f:
+    # Rotate the old env file just in case
+    if ENV_FILE.exists():
+        ENV_FILE.replace(ENV_FILE.with_suffix(".env.bak"))
+    with ENV_FILE.open("w") as f:
         for key, val in env.items():
             f.write(f"{key}={val}\n")
 
@@ -34,17 +36,15 @@ def write_env(env):
 form = cgi.FieldStorage()
 action = form.getvalue("action")
 
-if action == "get":
-    env = read_env()
-    print(json.dumps(env))
-elif action == "set":
-    try:
-        raw = os.environ.get("CONTENT_LENGTH")
-        length = int(raw) if raw else 0
+try:
+    if action == "get":
+        print(json.dumps(read_env()))
+    elif action == "set":
+        length = int(os.environ.get("CONTENT_LENGTH", "0"))
         data = json.loads(os.read(0, length))
         write_env(data)
         print(json.dumps({"status": "ok", "message": "Configuration saved."}))
-    except Exception as e:
-        print(json.dumps({"status": "error", "message": str(e)}))
-else:
+    else:
         print(json.dumps({"status": "error", "message": "Invalid action"}))
+except Exception as e:
+    print(json.dumps({"status": "error", "message": str(e)}))