fix crash on empty/new config file

fix crash on empty/new config file

caused by import-time unavailability of config registry (due to ordering). so move the code to runtime.

Author: mueslo

pythonbits/api_utils.py

@@ -3,12 +3,15 @@
 
 from .config import config
 
-seed = config.get('Tracker', 'domain').encode('utf8')
-test = sha224(seed).hexdigest()
-if not test.endswith('f280f') and not test.endswith('5abc3'):
-    raise Exception('Wrong domain! Manually fix {}'.format(config.config_path))
-psk = sha256(seed).hexdigest()
 
+def get_psk():
+    seed = config.get('Tracker', 'domain').encode('utf8')
+    test = sha224(seed).hexdigest()
+    if not test.endswith('f280f') and not test.endswith('5abc3'):
+        raise Exception('Wrong domain! '
+                        'Manually fix {}'.format(config.config_path))
+    return sha256(seed).hexdigest()
 
 def d(a):
+    psk = get_psk()
     return "".join([chr(ord(a[i]) ^ ord(psk[i])) for i in range(len(a))])