qt: easier import/export of channel backups

electrum/gui/kivy/uix/dialogs/lightning_channels.py

@@ -9,6 +9,7 @@ from kivy.clock import Clock
 
 from electrum.util import bh2u
 from electrum.lnutil import LOCAL, REMOTE, format_short_channel_id
+from electrum.lnchannel import AbstractChannel, Channel
 from electrum.gui.kivy.i18n import _
 from .question import Question
 
@@ -285,7 +286,7 @@ Builder.load_string(r'''
 
 class ChannelBackupPopup(Popup):
 
-    def __init__(self, chan, app, **kwargs):
+    def __init__(self, chan: AbstractChannel, app: 'ElectrumWindow', **kwargs):
         super(ChannelBackupPopup,self).__init__(**kwargs)
         self.chan = chan
         self.app = app
@@ -320,7 +321,7 @@ class ChannelBackupPopup(Popup):
 
 class ChannelDetailsPopup(Popup):
 
-    def __init__(self, chan, app, **kwargs):
+    def __init__(self, chan: Channel, app: 'ElectrumWindow', **kwargs):
         super(ChannelDetailsPopup,self).__init__(**kwargs)
         self.is_closed = chan.is_closed()
         self.is_redeemed = chan.is_redeemed()

electrum/gui/qt/channels_list.py

@@ -132,7 +132,8 @@ class ChannelsList(MyTreeView):
             _("If you lose your wallet file, the only thing you can do with a backup is to request your channel to be closed, so that your funds will be sent on-chain."),
         ])
         data = self.lnworker.export_channel_backup(channel_id)
-        self.main_window.show_qrcode(data, 'channel backup', help_text=msg)
+        self.main_window.show_qrcode(data, 'channel backup', help_text=msg,
+                                     show_copy_text_btn=True)
 
     def request_force_close(self, channel_id):
         def task():
@@ -147,6 +148,8 @@ class ChannelsList(MyTreeView):
         menu.setSeparatorsCollapsible(True)  # consecutive separators are merged together
         selected = self.selected_in_column(self.Columns.NODE_ALIAS)
         if not selected:
+            menu.addAction(_("Import channel backup"), lambda: self.parent.do_process_from_text_channel_backup())
+            menu.exec_(self.viewport().mapToGlobal(position))
             return
         multi_select = len(selected) > 1
         if multi_select:

electrum/gui/qt/main_window.py

@@ -585,7 +585,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
 
     def select_backup_dir(self, b):
         name = self.config.get('backup_dir', '')
-        dirname = QFileDialog.getExistingDirectory(self, "Select your SSL certificate file", name)
+        dirname = QFileDialog.getExistingDirectory(self, "Select your wallet backup directory", name)
         if dirname:
             self.config.set_key('backup_dir', dirname)
             self.backup_dir_e.setText(dirname)
@@ -2395,10 +2395,12 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
         d = SeedDialog(self, seed, passphrase)
         d.exec_()
 
-    def show_qrcode(self, data, title = _("QR code"), parent=None, help_text=None):
+    def show_qrcode(self, data, title = _("QR code"), parent=None, *,
+                    help_text=None, show_copy_text_btn=False):
         if not data:
             return
-        d = QRDialog(data, parent or self, title, help_text=help_text)
+        d = QRDialog(data, parent or self, title, help_text=help_text,
+                     show_copy_text_btn=show_copy_text_btn)
         d.exec_()
 
     @protected
@@ -2605,7 +2607,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
             self.show_critical(_("Electrum was unable to parse your transaction") + ":\n" + repr(e))
             return
 
-    def import_channel_backup(self, encrypted):
+    def import_channel_backup(self, encrypted: str):
         if not self.question('Import channel backup?'):
             return
         try:
@@ -2658,6 +2660,13 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
         if tx:
             self.show_transaction(tx)
 
+    def do_process_from_text_channel_backup(self):
+        text = text_dialog(self, _('Input channel backup'), _("Channel Backup:"), _("Load backup"))
+        if not text:
+            return
+        if text.startswith('channel_backup:'):
+            self.import_channel_backup(text)
+
     def do_process_from_file(self):
         tx = self.read_tx_from_file()
         if tx:

electrum/gui/qt/qrcodewidget.py

@@ -93,7 +93,16 @@ class QRCodeWidget(QWidget):
 
 class QRDialog(WindowModalDialog):
 
-    def __init__(self, data, parent=None, title = "", show_text=False, help_text=None):
+    def __init__(
+            self,
+            data,
+            parent=None,
+            title="",
+            show_text=False,
+            *,
+            help_text=None,
+            show_copy_text_btn=False,
+    ):
         WindowModalDialog.__init__(self, parent, title)
 
         vbox = QVBoxLayout()
@@ -119,14 +128,23 @@ class QRDialog(WindowModalDialog):
             p.save(filename, 'png')
             self.show_message(_("QR code saved to file") + " " + filename)
 
-        def copy_to_clipboard():
+        def copy_image_to_clipboard():
             p = qrw.grab()
             QApplication.clipboard().setPixmap(p)
             self.show_message(_("QR code copied to clipboard"))
 
-        b = QPushButton(_("Copy"))
+        def copy_text_to_clipboard():
+            QApplication.clipboard().setText(data)
+            self.show_message(_("Text copied to clipboard"))
+
+        b = QPushButton(_("Copy Image"))
         hbox.addWidget(b)
-        b.clicked.connect(copy_to_clipboard)
+        b.clicked.connect(copy_image_to_clipboard)
+
+        if show_copy_text_btn:
+            b = QPushButton(_("Copy Text"))
+            hbox.addWidget(b)
+            b.clicked.connect(copy_text_to_clipboard)
 
         b = QPushButton(_("Save"))
         hbox.addWidget(b)