sweep/import key: show error in Qt GUI to user as tooltip

electrum/base_wizard.py

@@ -199,7 +199,7 @@ class BaseWizard(object):
         self.choice_dialog(title=title, message=message, choices=choices, run_next=self.run)
 
     def import_addresses_or_keys(self):
-        v = lambda x: keystore.is_address_list(x) or keystore.is_private_key_list(x)
+        v = lambda x: keystore.is_address_list(x) or keystore.is_private_key_list(x, raise_on_error=True)
         title = _("Import Bitcoin Addresses")
         message = _("Enter a list of Bitcoin addresses (this will create a watching-only wallet), or a list of private keys.")
         self.add_xpub_dialog(title=title, message=message, run_next=self.on_import,

electrum/bitcoin.py

@@ -615,11 +615,13 @@ def is_address(addr: str, *, net=None) -> bool:
            or is_b58_address(addr, net=net)
 
 
-def is_private_key(key: str) -> bool:
+def is_private_key(key: str, *, raise_on_error=False) -> bool:
     try:
-        k = deserialize_privkey(key)
-        return k is not False
-    except:
+        deserialize_privkey(key)
+        return True
+    except BaseException as e:
+        if raise_on_error:
+            raise
         return False
 
 

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

@@ -899,7 +899,12 @@ class AddXpubDialog(WizardDialog):
 
     def __init__(self, wizard, **kwargs):
         WizardDialog.__init__(self, wizard, **kwargs)
-        self.is_valid = kwargs['is_valid']
+        def is_valid(x):
+            try:
+                return kwargs['is_valid'](x)
+            except:
+                return False
+        self.is_valid = is_valid
         self.title = kwargs['title']
         self.message = kwargs['message']
         self.allow_multi = kwargs.get('allow_multi', False)

electrum/gui/qt/main_window.py

@@ -2669,14 +2669,22 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
             if bitcoin.is_address(addr):
                 return addr
 
-        def get_pk():
+        def get_pk(*, raise_on_error=False):
             text = str(keys_e.toPlainText())
-            return keystore.get_private_keys(text)
+            return keystore.get_private_keys(text, raise_on_error=raise_on_error)
 
-        f = lambda: button.setEnabled(get_address() is not None and get_pk() is not None)
+        def on_edit():
+            valid_privkeys = False
+            try:
+                valid_privkeys = get_pk(raise_on_error=True) is not None
+            except Exception as e:
+                button.setToolTip(f'{_("Error")}: {str(e)}')
+            else:
+                button.setToolTip('')
+            button.setEnabled(get_address() is not None and valid_privkeys)
         on_address = lambda text: address_e.setStyleSheet((ColorScheme.DEFAULT if get_address() else ColorScheme.RED).as_stylesheet())
-        keys_e.textChanged.connect(f)
-        address_e.textChanged.connect(f)
+        keys_e.textChanged.connect(on_edit)
+        address_e.textChanged.connect(on_edit)
         address_e.textChanged.connect(on_address)
         on_address(str(address_e.text()))
         if not d.exec_():

electrum/gui/qt/seed_dialog.py

@@ -198,8 +198,14 @@ class KeysLayout(QVBoxLayout):
         return self.text_e.text()
 
     def on_edit(self):
-        b = self.is_valid(self.get_text())
-        self.parent.next_button.setEnabled(b)
+        valid = False
+        try:
+            valid = self.is_valid(self.get_text())
+        except Exception as e:
+            self.parent.next_button.setToolTip(f'{_("Error")}: {str(e)}')
+        else:
+            self.parent.next_button.setToolTip('')
+        self.parent.next_button.setEnabled(valid)
 
 
 class SeedDialog(WindowModalDialog):

electrum/keystore.py

@@ -752,19 +752,21 @@ def is_address_list(text):
     return bool(parts) and all(bitcoin.is_address(x) for x in parts)
 
 
-def get_private_keys(text, *, allow_spaces_inside_key=True):
+def get_private_keys(text, *, allow_spaces_inside_key=True, raise_on_error=False):
     if allow_spaces_inside_key:  # see #1612
         parts = text.split('\n')
         parts = map(lambda x: ''.join(x.split()), parts)
         parts = list(filter(bool, parts))
     else:
         parts = text.split()
-    if bool(parts) and all(bitcoin.is_private_key(x) for x in parts):
+    if bool(parts) and all(bitcoin.is_private_key(x, raise_on_error=raise_on_error) for x in parts):
         return parts
 
 
-def is_private_key_list(text, *, allow_spaces_inside_key=True):
-    return bool(get_private_keys(text, allow_spaces_inside_key=allow_spaces_inside_key))
+def is_private_key_list(text, *, allow_spaces_inside_key=True, raise_on_error=False):
+    return bool(get_private_keys(text,
+                                 allow_spaces_inside_key=allow_spaces_inside_key,
+                                 raise_on_error=raise_on_error))
 
 
 is_mpk = lambda x: is_old_mpk(x) or is_xpub(x)

electrum/wallet.py

@@ -1472,8 +1472,8 @@ class Imported_Wallet(Simple_Wallet):
         for key in keys:
             try:
                 txin_type, pubkey = self.keystore.import_privkey(key, password)
-            except Exception:
-                bad_keys.append((key, _('invalid private key')))
+            except Exception as e:
+                bad_keys.append((key, _('invalid private key') + f': {e}'))
                 continue
             if txin_type not in ('p2pkh', 'p2wpkh', 'p2wpkh-p2sh'):
                 bad_keys.append((key, _('not implemented type') + f': {txin_type}'))