Trustedcoin: prepaid-only billing

plugins/trustedcoin/qt.py

@@ -142,7 +142,7 @@ class Plugin(TrustedCoinPlugin):
         vbox.addLayout(hbox)
         vbox.addStretch(10)
 
-        msg = _('TrustedCoin charges a fee per co-signed transaction. You may pay on each transaction (an extra output will be added to your transaction), or you may purchase prepaid transaction using this dialog.') + '<br/>'
+        msg = _('TrustedCoin charges a small fee to co-sign transactions. The fee depends on how many prepaid transactions you buy. An extra output is added to your transaction everytime you run out of prepaid transactions.') + '<br/>'
         label = QLabel(msg)
         label.setWordWrap(1)
         vbox.addWidget(label)
@@ -152,35 +152,21 @@ class Plugin(TrustedCoinPlugin):
         vbox.addLayout(grid)
 
         price_per_tx = wallet.price_per_tx
-        v = price_per_tx.get(1)
-        grid.addWidget(QLabel(_("Price per transaction (not prepaid):")), 0, 0)
-        grid.addWidget(QLabel(window.format_amount(v) + ' ' + window.base_unit()), 0, 1)
-
-        i = 1
-
+        n_prepay = wallet.num_prepay(self.config)
+        i = 0
         for k, v in sorted(price_per_tx.items()):
             if k == 1:
                 continue
-            grid.addWidget(QLabel("Price for %d prepaid transactions:"%k), i, 0)
-            grid.addWidget(QLabel("%d x "%k + window.format_amount(v/k) + ' ' + window.base_unit()), i, 1)
-            b = QPushButton(_("Buy"))
-            b.clicked.connect(lambda b, k=k, v=v: self.on_buy(window, k, v, d))
+            grid.addWidget(QLabel("Pay every %d transactions:"%k), i, 0)
+            grid.addWidget(QLabel(window.format_amount(v/k) + ' ' + window.base_unit() + "/tx"), i, 1)
+            b = QRadioButton()
+            b.setChecked(k == n_prepay)
+            b.clicked.connect(lambda b, k=k: self.config.set_key('trustedcoin_prepay', k, True))
             grid.addWidget(b, i, 2)
             i += 1
 
         n = wallet.billing_info.get('tx_remaining', 0)
         grid.addWidget(QLabel(_("Your wallet has %d prepaid transactions.")%n), i, 0)
-
-        # tranfer button
-        #def on_transfer():
-        #    server.transfer_credit(self.user_id, recipient, otp, signature_callback)
-        #    pass
-        #b = QPushButton(_("Transfer"))
-        #b.clicked.connect(on_transfer)
-        #grid.addWidget(b, 1, 2)
-
-        #grid.addWidget(QLabel(_("Next Billing Address:")), i, 0)
-        #grid.addWidget(QLabel(self.billing_info['billing_address']), i, 1)
         vbox.addLayout(Buttons(CloseButton(d)))
         d.exec_()
 

plugins/trustedcoin/trustedcoin.py

@@ -209,7 +209,7 @@ class Wallet_2fa(Multisig_Wallet):
         sendable = sum(map(lambda x:x['value'], inputs))
         for i in inputs:
             self.add_input_info(i)
-        xf = self.extra_fee()
+        xf = self.extra_fee(config)
         _type, addr = recipient
         if xf and sendable >= xf:
             billing_address = self.billing_info['billing_address']
@@ -224,22 +224,33 @@ class Wallet_2fa(Multisig_Wallet):
         amount = max(0, sendable - fee)
         return amount, fee
 
-    def extra_fee(self):
+    def min_prepay(self):
+        return min(self.price_per_tx.keys())
+
+    def num_prepay(self, config):
+        default = self.min_prepay()
+        n = config.get('trustedcoin_prepay', default)
+        if n not in self.price_per_tx:
+            n = default
+        return n
+
+    def extra_fee(self, config):
         if self.can_sign_without_server():
             return 0
         if self.billing_info.get('tx_remaining'):
             return 0
         if self.is_billing:
             return 0
-        price = int(self.price_per_tx.get(1))
-        assert price <= 100000
+        n = self.num_prepay(config)
+        price = int(self.price_per_tx[n])
+        assert price <= 100000 * n
         return price
 
     def make_unsigned_transaction(self, coins, outputs, config,
                                   fixed_fee=None, change_addr=None):
         mk_tx = lambda o: Multisig_Wallet.make_unsigned_transaction(
             self, coins, o, config, fixed_fee, change_addr)
-        fee = self.extra_fee()
+        fee = self.extra_fee(config)
         if fee:
             address = self.billing_info['billing_address']
             fee_output = (TYPE_ADDRESS, address, fee)
@@ -329,6 +340,7 @@ class TrustedCoinPlugin(BasePlugin):
         assert billing_address == billing_info['billing_address']
         wallet.billing_info = billing_info
         wallet.price_per_tx = dict(billing_info['price_per_tx'])
+        wallet.price_per_tx.pop(1)
         return True
 
     def make_seed(self):