add 'donate to server' menu item

gui/qt/main_window.py

@@ -450,9 +450,17 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         help_menu.addSeparator()
         help_menu.addAction(_("&Documentation"), lambda: webbrowser.open("http://docs.electrum.org/")).setShortcut(QKeySequence.HelpContents)
         help_menu.addAction(_("&Report Bug"), self.show_report_bug)
+        help_menu.addSeparator()
+        help_menu.addAction(_("&Donate to server"), self.donate_to_server)
 
         self.setMenuBar(menubar)
 
+    def donate_to_server(self):
+        if self.network.is_connected():
+            d = self.network.get_donation_address()
+            host = self.network.get_parameters()[0]
+            self.pay_to_URI('bitcoin:%s?message=donation for %s'%(d, host))
+
     def show_about(self):
         QMessageBox.about(self, "Electrum",
             _("Version")+" %s" % (self.wallet.electrum_version) + "\n\n" + _("Electrum's focus is speed, with low resource usage and simplifying Bitcoin. You do not need to perform regular backups, because your wallet can be recovered from a secret phrase that you can memorize or write on paper. Startup times are instant because it operates in conjunction with high-performance servers that handle the most complicated parts of the Bitcoin system."))

lib/network.py

@@ -167,6 +167,7 @@ class Network(util.DaemonThread):
         self.recent_servers = self.read_recent_servers()
 
         self.banner = ''
+        self.donation_address = ''
         self.fee = None
         self.relay_fee = None
         self.heights = {}
@@ -289,6 +290,7 @@ class Network(util.DaemonThread):
         for addr in self.subscribed_addresses:
             self.queue_request('blockchain.address.subscribe', [addr])
         self.queue_request('server.banner', [])
+        self.queue_request('server.donation_address', [])
         self.queue_request('server.peers.subscribe', [])
         self.queue_request('blockchain.estimatefee', [2])
         self.queue_request('blockchain.relayfee', [])
@@ -318,6 +320,10 @@ class Network(util.DaemonThread):
         host, port, protocol = deserialize_server(self.default_server)
         return host, port, protocol, self.proxy, self.auto_connect
 
+    def get_donation_address(self):
+        if self.is_connected():
+            return self.donation_address
+
     def get_interfaces(self):
         '''The interfaces that are in connected state'''
         return self.interfaces.keys()
@@ -485,6 +491,9 @@ class Network(util.DaemonThread):
             if error is None:
                 self.banner = result
                 self.notify('banner')
+        elif method == 'server.donation_address':
+            if error is None:
+                self.donation_address = result
         elif method == 'blockchain.estimatefee':
             if error is None:
                 self.fee = int(result * COIN)