new command: signtx (offline transaction signing)

electrum

@@ -67,6 +67,7 @@ options:
 Syntax: mktx <recipient> <amount> [label]
 options:\n  --fee, -f: set transaction fee\n  --fromaddr, -s: send from address -\n  --changeaddr, -c: send change to address
         """,
+    'signtx':"Sign an unsigned transaction created by a deseeded wallet\nSyntax: signtx <filename>",
     'seed':
             "Print the generation seed of your wallet.",
     'import': 
@@ -93,7 +94,7 @@ options:\n  --fee, -f: set transaction fee\n  --fromaddr, -s: send from address
 
 
 
-offline_commands = [ 'password', 'mktx',
+offline_commands = [ 'password', 'mktx', 'signtx',
                      'label', 'contacts',
                      'help', 'validateaddress',
                      'signmessage', 'verifymessage',
@@ -104,7 +105,7 @@ offline_commands = [ 'password', 'mktx',
                      'prioritize','unprioritize']
 
 
-protected_commands = ['payto', 'password', 'mktx', 'seed', 'import','signmessage' ]
+protected_commands = ['payto', 'password', 'mktx', 'signtx', 'seed', 'import','signmessage' ]
 
 # get password routine
 def prompt_password(prompt, confirm=True):
@@ -594,6 +595,17 @@ if __name__ == '__main__':
             del(wallet.history[from_addr])
         wallet.save()
 
+    elif cmd == 'signtx':
+        import ast
+        filename = args[1]
+        f = open(filename, 'r')
+        d = ast.literal_eval(f.read())
+        f.close()
+        inputs = d['inputs']
+        outputs = d['outputs']
+        tx = wallet.signed_tx( inputs, outputs, password )
+        print_msg(tx)
+
     elif cmd == 'sendtx':
         tx = args[1]
         r, h = wallet.sendtx( tx )

lib/gui_qt.py

@@ -308,8 +308,7 @@ class ElectrumWindow(QMainWindow):
 
         self.tabs = tabs = QTabWidget(self)
         tabs.addTab(self.create_history_tab(), _('History') )
-        if self.wallet.seed:
-            tabs.addTab(self.create_send_tab(), _('Send') )
+        tabs.addTab(self.create_send_tab(), _('Send') )
         tabs.addTab(self.create_receive_tab(), _('Receive') )
         tabs.addTab(self.create_contacts_tab(), _('Contacts') )
         tabs.addTab(self.create_wall_tab(), _('Wall') )
@@ -772,17 +771,23 @@ class ElectrumWindow(QMainWindow):
         except BaseException, e:
             self.show_message(str(e))
             return
-            
-        h = self.wallet.send_tx(tx)
-        waiting_dialog(lambda: False if self.wallet.tx_event.isSet() else _("Please wait..."))
-        status, msg = self.wallet.receive_tx( h )
 
-        if status:
-            QMessageBox.information(self, '', _('Payment sent.')+'\n'+msg, _('OK'))
-            self.do_clear()
-            self.update_contacts_tab()
+        if self.wallet.seed:
+            h = self.wallet.send_tx(tx)
+            waiting_dialog(lambda: False if self.wallet.tx_event.isSet() else _("Please wait..."))
+            status, msg = self.wallet.receive_tx( h )
+            if status:
+                QMessageBox.information(self, '', _('Payment sent.')+'\n'+msg, _('OK'))
+                self.do_clear()
+                self.update_contacts_tab()
+            else:
+                QMessageBox.warning(self, _('Error'), msg, _('OK'))
         else:
-            QMessageBox.warning(self, _('Error'), msg, _('OK'))
+            filename = 'unsigned_tx'
+            f = open(filename,'w')
+            f.write(tx)
+            f.close()
+            QMessageBox.information(self, _('Unsigned transaction'), _("Unsigned transaction was saved to file:") + " " +filename, _('OK'))
 
 
     def set_url(self, url):

lib/wallet.py

@@ -776,10 +776,11 @@ class Wallet:
             change_addr = inputs[-1][0]
             print_error( "Sending change to", change_addr )
         outputs = self.add_tx_change(outputs, amount, fee, total, change_addr)
-        
-        s_inputs = self.sign_inputs( inputs, outputs, password )
 
-        tx = filter( raw_tx( s_inputs, outputs ) )
+        if not self.seed:
+            return {'inputs':inputs, 'outputs':outputs}
+        
+        tx = repr(self.signed_tx(inputs, outputs, password))
 
         for address, x in outputs:
             if address not in self.addressbook and not self.is_mine(address):
@@ -791,6 +792,11 @@ class Wallet:
 
         return tx
 
+    def signed_tx(self, inputs, outputs, password):
+        s_inputs = self.sign_inputs( inputs, outputs, password )
+        tx = filter( raw_tx( s_inputs, outputs ) )
+        return tx
+
     def sendtx(self, tx):
         # synchronous
         h = self.send_tx(tx)