Typo; easier QR code png saving

docs/howto/auth.md

@@ -205,26 +205,19 @@ and a plain secret code.
 - Enter this code into your 2FA application
 **or** save the QR into a file:
 ```python
-import base64
-
-url = response.get('secret', '')
-encoded = url.removeprefix('data:image/png;base64,')
-
-png = base64.b64decode(encoded)
-
-with open('test.png', 'wb') as f:
-    f.write(png)
+>>> qr = response.get('qrcode', '')
+>>> at.save_qr(qr, 'test.png')
 ```
 
 - Confirm:
 ```python
-at.enable_2fa(123456)
+>>> at.enable_2fa(123456)
 ```
 Where 123456 is an OTP code from the app.
 
 ### Disable 2FA
 It's pretty easy:
 ```python
-at.disable_2fa(123456)
+>>> at.disable_2fa(123456)
 ```
 And, of course, pass a real OTP code as an argument.

python_aternos/atclient.py

@@ -6,6 +6,8 @@ import re
 import hashlib
 import logging
 
+import base64
+
 from typing import List, Dict, Optional
 
 import lxml.html
@@ -398,7 +400,23 @@ class Client:
             'GET', sendtoken=True
         ).json()
     
-    def enbale_2fa(self, code: int) -> None:
+    def save_qr(self, qrcode: str, filename: str) -> None:
+
+        """Writes a 2FA QR code into a png-file
+
+        Args:
+            qrcode (str): Base64 encoded png image from `qrcode_2fa()`
+            filename (str): Where the QR code image must be saved.
+                Existing file will be rewritten.
+        """
+
+        data = qrcode.removeprefix('data:image/png;base64,')
+        png = base64.b64decode(data)
+
+        with open(filename, 'wb') as f:
+            f.write(png)
+
+    def enable_2fa(self, code: int) -> None:
 
         """Enables Two-Factor Authentication