Fix issue #6201:

- Pass a proper callback to WalletDialog
   (we used to call load_wallet_by_name recursively)
 - Do not cache PasswordDialog instances

electrum/gui/kivy/main_window.py

@@ -34,7 +34,7 @@ from kivy.clock import Clock
 from kivy.factory import Factory
 from kivy.metrics import inch
 from kivy.lang import Builder
-from .uix.dialogs.password_dialog import PasswordDialog, PincodeDialog
+from .uix.dialogs.password_dialog import OpenWalletDialog, ChangePasswordDialog, PincodeDialog
 
 ## lazy imports for factory so that widgets can be used in kv
 #Factory.register('InstallWizard', module='electrum.gui.kivy.uix.dialogs.installwizard')
@@ -379,8 +379,6 @@ class ElectrumWindow(App):
 
         # cached dialogs
         self._settings_dialog = None
-        self._pincode_dialog = None
-        self._password_dialog = None
         self._channels_dialog = None
         self._addresses_dialog = None
         self.fee_status = self.electrum_config.get_fee_status()
@@ -635,43 +633,10 @@ class ElectrumWindow(App):
             return
         if self.wallet and self.wallet.storage.path == path:
             return
-        wallet = self.daemon.load_wallet(path, None)
-        if wallet:
-            if wallet.has_password():
-                def on_success(x):
-                    # save password in memory
-                    self.password = x
-                    self.load_wallet(wallet)
-                self.password_dialog(
-                    basename = wallet.basename(),
-                    check_password=wallet.check_password,
-                    on_success=on_success,
-                    on_failure=self.stop)
-            else:
-                self.load_wallet(wallet)
         else:
             def launch_wizard():
-                storage = WalletStorage(path)
-                if not storage.file_exists():
-                    wizard = Factory.InstallWizard(self.electrum_config, self.plugins)
-                    wizard.path = path
-                    wizard.bind(on_wizard_complete=self.on_wizard_complete)
-                    wizard.run('new')
-                else:
-                    if storage.is_encrypted():
-                        if not storage.is_encrypted_with_user_pw():
-                            raise Exception("Kivy GUI does not support this type of encrypted wallet files.")
-                        def on_password(pw):
-                            self.password = pw
-                            storage.decrypt(pw)
-                            self._on_decrypted_storage(storage)
-                        self.password_dialog(
-                            basename = storage.basename(),
-                            check_password=storage.check_password,
-                            on_success=on_password,
-                            on_failure=self.stop)
-                        return
-                    self._on_decrypted_storage(storage)
+                d = OpenWalletDialog(self, path, self.on_open_wallet)
+                d.open()
             if not ask_if_wizard:
                 launch_wizard()
             else:
@@ -685,6 +650,21 @@ class ElectrumWindow(App):
                 d = Question(_('Do you want to launch the wizard again?'), handle_answer)
                 d.open()
 
+    def on_open_wallet(self, pw, storage):
+        if not storage.file_exists():
+            wizard = Factory.InstallWizard(self.electrum_config, self.plugins)
+            wizard.path = storage.path
+            wizard.bind(on_wizard_complete=self.on_wizard_complete)
+            wizard.run('new')
+        else:
+            try:
+                storage.decrypt(pw)
+            except StorageReadWriteError:
+                app.show_error(_("R/W error accessing path"))
+                return
+            self.password = pw
+            self._on_decrypted_storage(storage)
+
     def on_stop(self):
         Logger.info('on_stop')
         self.stop_wallet()
@@ -749,8 +729,8 @@ class ElectrumWindow(App):
 
     def wallets_dialog(self):
         from .uix.dialogs.wallets import WalletDialog
-        d = WalletDialog()
-        d.path = os.path.dirname(self.electrum_config.get_wallet_path())
+        dirname = os.path.dirname(self.electrum_config.get_wallet_path())
+        d = WalletDialog(dirname, self.load_wallet_by_name)
         d.open()
 
     def popup_dialog(self, name):
@@ -969,7 +949,8 @@ class ElectrumWindow(App):
     def on_resume(self):
         now = time.time()
         if self.wallet and self.wallet.has_password() and now - self.pause_time > 5*60:
-            self.pincode_dialog(check_password=self.check_pin_code, on_success=None, on_failure=self.stop)
+            d = PincodeDialog(check_password=self.check_pin_code, on_success=None, on_failure=self.stop)
+            d.open()
         if self.nfcscanner:
             self.nfcscanner.nfc_enable()
 
@@ -1150,11 +1131,12 @@ class ElectrumWindow(App):
         if self.electrum_config.get('pin_code'):
             msg += "\n" + _("Enter your PIN code to proceed")
             on_success = lambda pw: f(*args, self.password)
-            self.pincode_dialog(
+            d = PincodeDialog(
                 message = msg,
                 check_password=self.check_pin_code,
                 on_success=on_success,
                 on_failure=lambda: None)
+            d.open()
         else:
             d = Question(
                 msg,
@@ -1242,45 +1224,28 @@ class ElectrumWindow(App):
         if pin != self.electrum_config.get('pin_code'):
             raise InvalidPassword
 
-    def password_dialog(self, **kwargs):
-        if self._password_dialog is None:
-            self._password_dialog = PasswordDialog()
-        self._password_dialog.init(self, **kwargs)
-        self._password_dialog.open()
-
-    def pincode_dialog(self, **kwargs):
-        if self._pincode_dialog is None:
-            self._pincode_dialog = PincodeDialog()
-        self._pincode_dialog.init(self, **kwargs)
-        self._pincode_dialog.open()
-
     def change_password(self, cb):
         def on_success(old_password, new_password):
             self.wallet.update_password(old_password, new_password)
             self.password = new_password
             self.show_info(_("Your password was updated"))
         on_failure = lambda: self.show_error(_("Password not updated"))
-        self.password_dialog(
-            basename = self.wallet.basename(),
-            check_password = self.wallet.check_password,
-            on_success=on_success, on_failure=on_failure,
-            is_change=True,
-            has_password=self.wallet.has_password())
+        d = ChangePasswordDialog(self, self.wallet, on_success, on_failure)
+        d.open()
 
     def change_pin_code(self, cb):
-        if self._pincode_dialog is None:
-            self._pincode_dialog = PincodeDialog()
         def on_success(old_password, new_password):
             self.electrum_config.set_key('pin_code', new_password)
             cb()
             self.show_info(_("PIN updated") if new_password else _('PIN disabled'))
         on_failure = lambda: self.show_error(_("PIN not updated"))
-        self._pincode_dialog.init(
+
+        d = PincodeDialog(
             self, check_password=self.check_pin_code,
             on_success=on_success, on_failure=on_failure,
             is_change=True,
             has_password = self.has_pin_code())
-        self._pincode_dialog.open()
+        d.open()
 
     def save_backup(self):
         if platform != 'android':

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

@@ -1168,9 +1168,8 @@ class InstallWizard(BaseWizard, Widget):
         def on_failure():
             self.show_error(_('Password mismatch'))
             self.run('request_password', run_next)
-        popup = PasswordDialog()
         app = App.get_running_app()
-        popup.init(
+        popup = PasswordDialog(
             app,
             check_password=lambda x:True,
             on_success=on_success,

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

@@ -1,4 +1,5 @@
 from typing import Callable, TYPE_CHECKING, Optional, Union
+import os
 
 from kivy.app import App
 from kivy.factory import Factory
@@ -8,8 +9,11 @@ from decimal import Decimal
 from kivy.clock import Clock
 
 from electrum.util import InvalidPassword
+from electrum.wallet import WalletStorage
 from electrum.gui.kivy.i18n import _
 
+from .wallets import WalletDialog
+
 if TYPE_CHECKING:
     from ...main_window import ElectrumWindow
     from electrum.wallet import Abstract_Wallet
@@ -23,6 +27,7 @@ Builder.load_string('''
     message: ''
     basename:''
     is_change: False
+    require_password: True
     BoxLayout:
         size_hint: 1, 1
         orientation: 'vertical'
@@ -57,6 +62,8 @@ Builder.load_string('''
         BoxLayout:
             orientation: 'horizontal'
             id: box_generic_password
+            disabled: not root.require_password
+            opacity: int(root.require_password)
             size_hint_y: 0.05
             height: '40dp'
             TextInput:
@@ -79,6 +86,20 @@ Builder.load_string('''
                     textinput_generic_password.password = False if textinput_generic_password.password else True
         Widget:
             size_hint: 1, 1
+        BoxLayout:
+            orientation: 'horizontal'
+            size_hint: 1, 0.5
+            Button:
+                text: 'Cancel'
+                size_hint: 0.5, None
+                height: '48dp'
+                on_release: popup.dismiss()
+            Button:
+                text: 'Next'
+                size_hint: 0.5, None
+                height: '48dp'
+                on_release:
+                    popup.on_password(textinput_generic_password.text)
 
 
 <PincodeDialog@Popup>
@@ -142,9 +163,9 @@ Builder.load_string('''
 ''')
 
 
-class AbstractPasswordDialog:
+class AbstractPasswordDialog(Factory.Popup):
 
-    def init(self, app: 'ElectrumWindow', *,
+    def __init__(self, app: 'ElectrumWindow', *,
              check_password = None,
              on_success: Callable = None, on_failure: Callable = None,
              is_change: bool = False,
@@ -152,6 +173,7 @@ class AbstractPasswordDialog:
              has_password: bool = False,
              message: str = '',
              basename:str=''):
+        Factory.Popup.__init__(self)
         self.app = app
         self.pw_check = check_password
         self.message = message
@@ -234,17 +256,26 @@ class AbstractPasswordDialog:
             self.clear_password()
 
 
-class PasswordDialog(AbstractPasswordDialog, Factory.Popup):
+class PasswordDialog(AbstractPasswordDialog):
     enter_pw_message = _('Enter your password')
     enter_new_pw_message = _('Enter new password')
     confirm_new_pw_message = _('Confirm new password')
     wrong_password_message = _('Wrong password')
     allow_disable = False
 
+    def __init__(self, app, **kwargs):
+        AbstractPasswordDialog.__init__(self, app, **kwargs)
+
     def clear_password(self):
         self.ids.textinput_generic_password.text = ''
 
     def on_password(self, pw: str):
+        #
+        if not self.require_password:
+            self.success = True
+            self.message = _('Please wait...')
+            self.dismiss()
+            return
         # if setting new generic password, enforce min length
         if self.level > 0:
             if len(pw) < 6:
@@ -253,17 +284,18 @@ class PasswordDialog(AbstractPasswordDialog, Factory.Popup):
         # don't enforce minimum length on existing
         self.do_check(pw)
 
-    def select_file(self):
-        self.app.wallets_dialog()
 
 
-class PincodeDialog(AbstractPasswordDialog, Factory.Popup):
+class PincodeDialog(AbstractPasswordDialog):
     enter_pw_message = _('Enter your PIN')
     enter_new_pw_message = _('Enter new PIN')
     confirm_new_pw_message = _('Confirm new PIN')
     wrong_password_message = _('Wrong PIN')
     allow_disable = True
 
+    def __init__(self, app, **kwargs):
+        AbstractPasswordDialog.__init__(self, app, **kwargs)
+
     def clear_password(self):
         self.ids.kb.password = ''
 
@@ -271,3 +303,51 @@ class PincodeDialog(AbstractPasswordDialog, Factory.Popup):
         # PIN codes are exactly 6 chars
         if len(pw) >= 6:
             self.do_check(pw)
+
+
+class ChangePasswordDialog(PasswordDialog):
+
+    def __init__(self, app, wallet, on_success, on_failure):
+        PasswordDialog.__init__(self, app,
+            basename = wallet.basename(),
+            check_password = wallet.check_password,
+            on_success=on_success,
+            on_failure=on_failure,
+            is_change=True,
+            has_password=wallet.has_password())
+
+
+class OpenWalletDialog(PasswordDialog):
+
+    def __init__(self, app, path, callback):
+        self.app = app
+        self.callback = callback
+        PasswordDialog.__init__(self, app,
+            on_success=lambda pw: self.callback(pw, self.storage),
+            on_failure=self.app.stop)
+        self.init_storage_from_path(path)
+
+    def select_file(self):
+        dirname = os.path.dirname(self.app.electrum_config.get_wallet_path())
+        d = WalletDialog(dirname, self.init_storage_from_path)
+        d.open()
+
+    def init_storage_from_path(self, path):
+        self.storage = WalletStorage(path)
+        self.basename = self.storage.basename()
+        if not self.storage.file_exists():
+            self.require_password = False
+            self.message = _('Press Next to create')
+        elif self.storage.is_encrypted():
+            if not self.storage.is_encrypted_with_user_pw():
+                raise Exception("Kivy GUI does not support this type of encrypted wallet files.")
+            self.require_password = True
+            self.pw_check = self.storage.check_password
+            self.message = self.enter_pw_message
+        else:
+            # it is a bit wasteful load the wallet here and load it again in main_window,
+            # but that is fine, because we are progressively enforcing storage encryption.
+            wallet = self.app.daemon.load_wallet(path, None)
+            self.require_password = wallet.has_password()
+            self.pw_check = wallet.check_password
+            self.message = self.enter_pw_message if self.require_password else _('Wallet not encrypted')

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

@@ -12,7 +12,6 @@ from ...i18n import _
 from .label_dialog import LabelDialog
 
 Builder.load_string('''
-#:import os os
 <WalletDialog@Popup>:
     title: _('Wallets')
     id: popup
@@ -40,7 +39,7 @@ Builder.load_string('''
                 text: _('New')
                 on_release:
                     popup.dismiss()
-                    root.new_wallet(app, wallet_selector.path)
+                    root.new_wallet(wallet_selector.path)
             Button:
                 id: open_button
                 size_hint: 0.1, None
@@ -49,26 +48,21 @@ Builder.load_string('''
                 disabled: not wallet_selector.selection
                 on_release:
                     popup.dismiss()
-                    root.open_wallet(app)
+                    root.callback(wallet_selector.selection[0])
 ''')
 
 class WalletDialog(Factory.Popup):
 
-    def new_wallet(self, app, dirname):
+    def __init__(self, path, callback):
+        Factory.Popup.__init__(self)
+        self.path = path
+        self.callback = callback
+
+    def new_wallet(self, dirname):
         def cb(filename):
             if not filename:
                 return
             # FIXME? "filename" might contain ".." (etc) and hence sketchy path traversals are possible
-            try:
-                app.load_wallet_by_name(os.path.join(dirname, filename))
-            except StorageReadWriteError:
-                app.show_error(_("R/W error accessing path"))
+            self.callback(os.path.join(dirname, filename))
         d = LabelDialog(_('Enter wallet name'), '', cb)
         d.open()
-
-    def open_wallet(self, app):
-        try:
-            app.load_wallet_by_name(self.ids.wallet_selector.selection[0])
-        except StorageReadWriteError:
-            app.show_error(_("R/W error accessing path"))
-