better code organization

function parameters should be lowercase

Fix crash on invalid labels import

Added invoice exporting and reduced duplicate code

Better exception handling

removed json module import

some more cleanup

Cleaned up some stuff

Added exporting contacts

lib/contacts.py

@@ -25,10 +25,11 @@ import dns
 import json
 import traceback
 import sys
+import os
 
 from . import bitcoin
 from . import dnssec
-from .util import FileImportFailed, FileImportFailedEncrypted
+from .util import export_meta, import_meta
 
 
 class Contacts(dict):
@@ -51,18 +52,15 @@ class Contacts(dict):
         self.storage.put('contacts', dict(self))
 
     def import_file(self, path):
-        try:
-            with open(path, 'r') as f:
-                d = self._validate(json.loads(f.read()))
-        except json.decoder.JSONDecodeError:
-            traceback.print_exc(file=sys.stderr)
-            raise FileImportFailedEncrypted()
-        except BaseException:
-            traceback.print_exc(file=sys.stdout)
-            raise FileImportFailed()
-        self.update(d)
+        import_meta(path, self.validate, self.load_meta)
+
+    def load_meta(self, data):
+        self.update(data)
         self.save()
 
+    def export_file(self, fileName):
+        export_meta(self, fileName)
+
     def __setitem__(self, key, value):
         dict.__setitem__(self, key, value)
         self.save()
@@ -119,7 +117,7 @@ class Contacts(dict):
         except AttributeError:
             return None
             
-    def _validate(self, data):
+    def validate(self, data):
         for k,v in list(data.items()):
             if k == 'contacts':
                 return self._validate(v)