add unified wallet password support

electrum/gui/qml/components/Wallets.qml

@@ -42,7 +42,7 @@ Pane {
 
     function changePassword() {
         // trigger dialog via wallet (auth then signal)
-        Daemon.currentWallet.start_change_password()
+        Daemon.start_change_password()
     }
 
     property QtObject menu: Menu {
@@ -307,6 +307,19 @@ Pane {
             Daemon.availableWallets.reload()
             app.stack.pop()
         }
+        function onRequestNewPassword() { // new unified password (all wallets)
+            var dialog = app.passwordDialog.createObject(app,
+                    {
+                        'confirmPassword': true,
+                        'title': qsTr('Enter new password'),
+                        'infotext': qsTr('If you forget your password, you\'ll need to\
+                        restore from seed. Please make sure you have your seed stored safely')
+                    } )
+            dialog.accepted.connect(function() {
+                Daemon.set_password(dialog.password)
+            })
+            dialog.open()
+        }
     }
 
     Connections {

electrum/gui/qml/qedaemon.py

@@ -6,7 +6,7 @@ from PyQt5.QtCore import Qt, QAbstractListModel, QModelIndex
 
 from electrum.util import register_callback, get_new_wallet_name, WalletFileException
 from electrum.logging import get_logger
-from electrum.wallet import Wallet, Abstract_Wallet
+from electrum.wallet import Wallet, Abstract_Wallet, update_password_for_directory
 from electrum.storage import WalletStorage, StorageReadWriteError
 from electrum.wallet_db import WalletDB
 
@@ -104,7 +104,8 @@ class QEDaemon(AuthMixin, QObject):
     _available_wallets = None
     _current_wallet = None
     _path = None
-
+    _use_single_password = False
+    _password = None
 
     walletLoaded = pyqtSignal()
     walletRequiresPassword = pyqtSignal()
@@ -144,6 +145,12 @@ class QEDaemon(AuthMixin, QObject):
                 self._loaded_wallets.add_wallet(wallet=wallet)
                 self._current_wallet = QEWallet.getInstanceFor(wallet)
                 self.walletLoaded.emit()
+
+                if self.daemon.config.get('single_password'):
+                    self._use_single_password = update_password_for_directory(self.daemon.config, password, password)
+                    self._password = password
+                self._logger.info(f'use single password: {self._use_single_password}')
+
                 self.daemon.config.save_last_wallet(wallet)
             else:
                 self._logger.info('could not open wallet')
@@ -195,3 +202,17 @@ class QEDaemon(AuthMixin, QObject):
             i = i + 1
         return f'wallet_{i}'
 
+    requestNewPassword = pyqtSignal()
+    @pyqtSlot()
+    @auth_protect
+    def start_change_password(self):
+        if self._use_single_password:
+            self.requestNewPassword.emit()
+        else:
+            self.currentWallet.requestNewPassword.emit()
+
+    @pyqtSlot(str)
+    def set_password(self, password):
+        assert self._use_single_password
+        self._logger.debug('about to set password to %s for ALL wallets' % password)
+        update_password_for_directory(self.daemon.config, self._password, password)

electrum/gui/qml/qewallet.py

@@ -57,6 +57,7 @@ class QEWallet(AuthMixin, QObject):
     invoiceCreateError = pyqtSignal([str,str], arguments=['code','error'])
     paymentSucceeded = pyqtSignal([str], arguments=['key'])
     paymentFailed = pyqtSignal([str,str], arguments=['key','reason'])
+    requestNewPassword = pyqtSignal()
 
     _network_signal = pyqtSignal(str, object)
 
@@ -499,12 +500,6 @@ class QEWallet(AuthMixin, QObject):
         except InvalidPassword as e:
             return False
 
-    requestNewPassword = pyqtSignal()
-    @pyqtSlot()
-    @auth_protect
-    def start_change_password(self):
-        self.requestNewPassword.emit()
-
     @pyqtSlot(str)
     def set_password(self, password):
         storage = self.wallet.storage