[Enhancement] Add exit dialog when entering passphrase

src/seedsigner/gui/screens/seed_screens.py

@@ -844,17 +844,18 @@ def _run(self):
             keyboard_swap = False
 
             # Check our two possible exit conditions
+            # TODO: note the unusual return value, consider refactoring to a Response object in the future
             if input == HardwareButtonsConstants.KEY3:
                 # Save!
                 # First light up key3
                 self.hw_button3.is_selected = True
                 self.hw_button3.render()
                 self.renderer.show_image()
-                return self.passphrase
+                return dict(passphrase=self.passphrase)
 
             elif input == HardwareButtonsConstants.KEY_PRESS and self.top_nav.is_selected:
                 # Back button clicked
-                return self.top_nav.selected_button
+                return dict(passphrase=self.passphrase, is_back_button=True)
 
             # Check for keyboard swaps
             if input == HardwareButtonsConstants.KEY1:

src/seedsigner/views/seed_views.py

@@ -355,20 +355,55 @@ def __init__(self):
 
     def run(self):
         passphrase_title=self.seed.passphrase_label
-        ret = self.run_screen(seed_screens.SeedAddPassphraseScreen, passphrase=self.seed.passphrase, title=passphrase_title)
+        ret_dict = self.run_screen(seed_screens.SeedAddPassphraseScreen, passphrase=self.seed.passphrase, title=passphrase_title)
 
-        if ret == RET_CODE__BACK_BUTTON:
-            return Destination(BackStackView)
-
         # The new passphrase will be the return value; it might be empty.
-        self.seed.set_passphrase(ret)
-        if len(self.seed.passphrase) > 0:
+        self.seed.set_passphrase(ret_dict["passphrase"])
+
+        if "is_back_button" in ret_dict:
+            if len(self.seed.passphrase) > 0:
+                return Destination(SeedAddPassphraseExitDialogView)
+            else:
+                return Destination(BackStackView)
+
+        elif len(self.seed.passphrase) > 0:
             return Destination(SeedReviewPassphraseView)
+
         else:
             return Destination(SeedFinalizeView)
 
 
 
+class SeedAddPassphraseExitDialogView(View):
+    EDIT = "Edit passphrase"
+    DISCARD = ("Discard passphrase", None, None, "red")
+
+    def __init__(self):
+        super().__init__()
+        self.seed = self.controller.storage.get_pending_seed()
+
+
+    def run(self):
+        button_data = [self.EDIT, self.DISCARD]
+
+        selected_menu_num = self.run_screen(
+            WarningScreen,
+            title="Discard passphrase?",
+            status_headline=None,
+            text=f"Your current passphrase entry will be erased",
+            show_back_button=False,
+            button_data=button_data,
+        )
+
+        if button_data[selected_menu_num] == self.EDIT:
+            return Destination(SeedAddPassphraseView)
+
+        elif button_data[selected_menu_num] == self.DISCARD:
+            self.seed.set_passphrase("")
+            return Destination(SeedFinalizeView)
+
+
+
 class SeedReviewPassphraseView(View):
     """
         Display the completed passphrase back to the user.

tests/screenshot_generator/generator.py

@@ -166,6 +166,7 @@ def add_op_return_to_psbt(psbt: PSBT, raw_payload_data: bytes):
             seed_views.SeedMnemonicInvalidView,
             seed_views.SeedFinalizeView,
             seed_views.SeedAddPassphraseView,
+            seed_views.SeedAddPassphraseExitDialogView,
             seed_views.SeedReviewPassphraseView,
 
             (seed_views.SeedOptionsView, dict(seed_num=0)),

tests/test_flows_psbt.py

@@ -82,7 +82,7 @@ def load_seed_into_decoder(view: scan_views.ScanView):
 			FlowStep(psbt_views.PSBTSelectSeedView, button_data_selection=psbt_views.PSBTSelectSeedView.SCAN_SEED),
 			FlowStep(scan_views.ScanSeedQRView, before_run=load_seed_into_decoder),
 			FlowStep(seed_views.SeedFinalizeView, button_data_selection=SettingsConstants.LABEL__BIP39_PASSPHRASE),
-			FlowStep(seed_views.SeedAddPassphraseView, screen_return_value="abc"),
+			FlowStep(seed_views.SeedAddPassphraseView, screen_return_value=dict(passphrase="abc")),
 			FlowStep(seed_views.SeedReviewPassphraseView, button_data_selection=seed_views.SeedReviewPassphraseView.DONE),
 			FlowStep(seed_views.SeedOptionsView, is_redirect=True),
 			FlowStep(psbt_views.PSBTOverviewView),

tests/test_flows_seed.py

@@ -41,9 +41,14 @@ def test_passphrase_entry_flow(self):
             FlowStep(MainMenuView, button_data_selection=MainMenuView.SCAN),
             FlowStep(scan_views.ScanView, before_run=load_seed_into_decoder),  # simulate read SeedQR; ret val is ignored
             FlowStep(seed_views.SeedFinalizeView, button_data_selection=SettingsConstants.LABEL__BIP39_PASSPHRASE),
-            FlowStep(seed_views.SeedAddPassphraseView, screen_return_value="muhpassphrase"),
+            FlowStep(seed_views.SeedAddPassphraseView, screen_return_value=dict(passphrase="muhpassphrase", is_back_button=True)),
+            FlowStep(seed_views.SeedAddPassphraseExitDialogView, button_data_selection=seed_views.SeedAddPassphraseExitDialogView.DISCARD),
+            FlowStep(seed_views.SeedFinalizeView, button_data_selection=SettingsConstants.LABEL__BIP39_PASSPHRASE),
+            FlowStep(seed_views.SeedAddPassphraseView, screen_return_value=dict(passphrase="muhpassphrase", is_back_button=True)),
+            FlowStep(seed_views.SeedAddPassphraseExitDialogView, button_data_selection=seed_views.SeedAddPassphraseExitDialogView.EDIT),
+            FlowStep(seed_views.SeedAddPassphraseView, screen_return_value=dict(passphrase="muhpassphrase")),
             FlowStep(seed_views.SeedReviewPassphraseView, button_data_selection=seed_views.SeedReviewPassphraseView.EDIT),
-            FlowStep(seed_views.SeedAddPassphraseView, screen_return_value="muhpassphrase2"),
+            FlowStep(seed_views.SeedAddPassphraseView, screen_return_value=dict(passphrase="muhpassphrase")),
             FlowStep(seed_views.SeedReviewPassphraseView, button_data_selection=seed_views.SeedReviewPassphraseView.DONE),
             FlowStep(seed_views.SeedOptionsView),
         ])

tests/test_flows_tools.py

@@ -65,7 +65,7 @@ def load_seed_into_decoder(view: scan_views.ScanView):
         self.run_sequence(
             sequence=[
                 FlowStep(seed_views.SeedFinalizeView, button_data_selection=SettingsConstants.LABEL__BIP39_PASSPHRASE),
-                FlowStep(seed_views.SeedAddPassphraseView, screen_return_value="mypassphrase"),
+                FlowStep(seed_views.SeedAddPassphraseView, screen_return_value=dict(passphrase="mypassphrase")),
                 FlowStep(seed_views.SeedReviewPassphraseView, button_data_selection=seed_views.SeedReviewPassphraseView.DONE),
                 FlowStep(seed_views.SeedOptionsView, is_redirect=True),
                 FlowStep(seed_views.SeedExportXpubScriptTypeView),