Add offline subaddress generation

monero/backends/offline.py

@@ -0,0 +1,72 @@
+from .. import exceptions
+from ..account import Account
+from ..address import Address
+from ..seed import Seed
+
+
+class WalletIsOffline(exceptions.BackendException):
+    pass
+
+
+class OfflineWallet(object):
+    """
+    Offline backend for Monero wallet. Provides support for address generation.
+    """
+    _address = None
+    _svk = None
+    _ssk = None
+
+    def __init__(self, address, view_key=None, spend_key=None):
+        self._address = Address(address)
+        self._svk = view_key or self._svk
+        self._ssk = spend_key or self._ssk
+
+    def height(self):
+        raise WalletIsOffline()
+
+    def spend_key(self):
+        return self._ssk
+
+    def view_key(self):
+        return self._svk
+
+    def seed(self):
+        return Seed(self._ssk)
+
+    def accounts(self):
+        return [Account(self, 0)]
+
+    def new_account(self, label=None):
+        raise WalletIsOffline()
+
+    def addresses(self, account=0):
+        if account == 0:
+            return [self._address]
+        raise WalletIsOffline()
+
+    def new_address(self, account=0, label=None):
+        raise WalletIsOffline()
+
+    def balances(self, account=0):
+        raise WalletIsOffline()
+
+    def transfers_in(self, account, pmtfilter):
+        raise WalletIsOffline()
+
+    def transfers_out(self, account, pmtfilter):
+        raise WalletIsOffline()
+
+    def export_outputs(self):
+        raise WalletIsOffline()
+
+    def import_outputs(self, outputs_hex):
+        raise WalletIsOffline()
+
+    def export_key_images(self):
+        raise WalletIsOffline()
+
+    def import_key_images(self, key_images):
+        raise WalletIsOffline()
+
+    def transfer(self, *args, **kwargs):
+        raise WalletIsOffline()