feat(core/mercury): impl flow_request_passphrase

This commit replaces request_passphrase with flow_request_passphrase.
The added benefit is that the user is prompted for confirmation if they
want to proceed with an empty passphrase.

core/.changelog.d/4054.added

@@ -0,0 +1 @@
+[T3T1] Added reassuring screen when entering empty passphrase

core/embed/rust/librust_qstr.h

@@ -248,6 +248,7 @@ static void _librust_qstrs(void) {
   MP_QSTR_flow_get_address;
   MP_QSTR_flow_prompt_backup;
   MP_QSTR_flow_request_number;
+  MP_QSTR_flow_request_passphrase;
   MP_QSTR_flow_show_share_words;
   MP_QSTR_flow_warning_hi_prio;
   MP_QSTR_get_language;
@@ -346,6 +347,7 @@ static void _librust_qstrs(void) {
   MP_QSTR_paint;
   MP_QSTR_passphrase__access_wallet;
   MP_QSTR_passphrase__always_on_device;
+  MP_QSTR_passphrase__continue_with_empty_passphrase;
   MP_QSTR_passphrase__from_host_not_shown;
   MP_QSTR_passphrase__hide;
   MP_QSTR_passphrase__next_screen_will_show_passphrase;

core/embed/rust/src/translations/generated/translated_string.rs

@@ -1357,6 +1357,7 @@ pub enum TranslatedString {
     words__title_done = 956,  // "Done"
     reset__slip39_checklist_more_info_threshold = 957,  // "The threshold sets the minumum number of shares needed to recover your wallet."
     reset__slip39_checklist_more_info_threshold_example_template = 958,  // "If you set {0} out of {1} shares, you'll need {2} backup shares to recover your wallet."
+    passphrase__continue_with_empty_passphrase = 959,  // "Continue with empty passphrase?"
 }
 
 impl TranslatedString {
@@ -2708,6 +2709,7 @@ impl TranslatedString {
             Self::words__title_done => "Done",
             Self::reset__slip39_checklist_more_info_threshold => "The threshold sets the minumum number of shares needed to recover your wallet.",
             Self::reset__slip39_checklist_more_info_threshold_example_template => "If you set {0} out of {1} shares, you'll need {2} backup shares to recover your wallet.",
+            Self::passphrase__continue_with_empty_passphrase => "Continue with empty passphrase?",
         }
     }
 
@@ -4060,6 +4062,7 @@ impl TranslatedString {
             Qstr::MP_QSTR_words__title_done => Some(Self::words__title_done),
             Qstr::MP_QSTR_reset__slip39_checklist_more_info_threshold => Some(Self::reset__slip39_checklist_more_info_threshold),
             Qstr::MP_QSTR_reset__slip39_checklist_more_info_threshold_example_template => Some(Self::reset__slip39_checklist_more_info_threshold_example_template),
+            Qstr::MP_QSTR_passphrase__continue_with_empty_passphrase => Some(Self::passphrase__continue_with_empty_passphrase),
             _ => None,
         }
     }

core/embed/rust/src/ui/model_mercury/component/keyboard/passphrase.rs

@@ -1,5 +1,5 @@
 use crate::{
-    strutil::TString,
+    strutil::{ShortString, TString},
     translations::TR,
     ui::{
         component::{
@@ -26,7 +26,7 @@ use core::cell::Cell;
 use num_traits::ToPrimitive;
 
 pub enum PassphraseKeyboardMsg {
-    Confirmed,
+    Confirmed(ShortString),
     Cancelled,
 }
 

core/embed/rust/src/ui/model_mercury/flow/mod.rs

@@ -8,6 +8,7 @@ pub mod continue_recovery;
 pub mod get_address;
 pub mod prompt_backup;
 pub mod request_number;
+pub mod request_passphrase;
 pub mod set_brightness;
 pub mod show_share_words;
 pub mod show_tutorial;
@@ -25,6 +26,7 @@ pub use continue_recovery::new_continue_recovery;
 pub use get_address::GetAddress;
 pub use prompt_backup::PromptBackup;
 pub use request_number::RequestNumber;
+pub use request_passphrase::RequestPassphrase;
 pub use set_brightness::SetBrightness;
 pub use show_share_words::ShowShareWords;
 pub use show_tutorial::ShowTutorial;

core/embed/rust/src/ui/model_mercury/layout.rs

@@ -4,10 +4,9 @@ use super::{
     component::{
         AddressDetails, Bip39Input, Button, CancelConfirmMsg, CancelInfoConfirmMsg,
         CoinJoinProgress, FidoConfirm, FidoMsg, Frame, FrameMsg, Homescreen, HomescreenMsg,
-        Lockscreen, MnemonicInput, MnemonicKeyboard, MnemonicKeyboardMsg, PassphraseKeyboard,
-        PassphraseKeyboardMsg, PinKeyboard, PinKeyboardMsg, Progress, PromptScreen,
-        SelectWordCount, SelectWordCountMsg, Slip39Input, StatusScreen, SwipeUpScreen,
-        SwipeUpScreenMsg, VerticalMenu, VerticalMenuChoiceMsg,
+        Lockscreen, MnemonicInput, MnemonicKeyboard, MnemonicKeyboardMsg, PinKeyboard,
+        PinKeyboardMsg, Progress, PromptScreen, SelectWordCount, SelectWordCountMsg, Slip39Input,
+        StatusScreen, SwipeUpScreen, SwipeUpScreenMsg, VerticalMenu, VerticalMenuChoiceMsg,
     },
     flow, theme,
 };
@@ -124,15 +123,6 @@ impl ComponentMsgObj for PinKeyboard<'_> {
     }
 }
 
-impl ComponentMsgObj for PassphraseKeyboard {
-    fn msg_try_into_obj(&self, msg: Self::Msg) -> Result<Obj, Error> {
-        match msg {
-            PassphraseKeyboardMsg::Confirmed => self.passphrase().try_into(),
-            PassphraseKeyboardMsg::Cancelled => Ok(CANCELLED.as_obj()),
-        }
-    }
-}
-
 impl<T> ComponentMsgObj for MnemonicKeyboard<T>
 where
     T: MnemonicInput,
@@ -954,16 +944,6 @@ extern "C" fn new_request_pin(n_args: usize, args: *const Obj, kwargs: *mut Map)
     unsafe { util::try_with_args_and_kwargs(n_args, args, kwargs, block) }
 }
 
-extern "C" fn new_request_passphrase(n_args: usize, args: *const Obj, kwargs: *mut Map) -> Obj {
-    let block = move |_args: &[Obj], kwargs: &Map| {
-        let _prompt: TString = kwargs.get(Qstr::MP_QSTR_prompt)?.try_into()?;
-        let _max_len: u32 = kwargs.get(Qstr::MP_QSTR_max_len)?.try_into()?;
-        let obj = LayoutObj::new(PassphraseKeyboard::new())?;
-        Ok(obj.into())
-    };
-    unsafe { util::try_with_args_and_kwargs(n_args, args, kwargs, block) }
-}
-
 extern "C" fn new_request_bip39(n_args: usize, args: *const Obj, kwargs: *mut Map) -> Obj {
     let block = move |_args: &[Obj], kwargs: &Map| {
         let prompt: TString = kwargs.get(Qstr::MP_QSTR_prompt)?.try_into()?;
@@ -1570,13 +1550,13 @@ pub static mp_module_trezorui2: Module = obj_module! {
     ///     """Request pin on device."""
     Qstr::MP_QSTR_request_pin => obj_fn_kw!(0, new_request_pin).as_obj(),
 
-    /// def request_passphrase(
+    /// def flow_request_passphrase(
     ///     *,
     ///     prompt: str,
     ///     max_len: int,
     /// ) -> LayoutObj[str | UiResult]:
     ///     """Passphrase input keyboard."""
-    Qstr::MP_QSTR_request_passphrase => obj_fn_kw!(0, new_request_passphrase).as_obj(),
+    Qstr::MP_QSTR_flow_request_passphrase => obj_fn_kw!(0, flow::request_passphrase::new_request_passphrase).as_obj(),
 
     /// def request_bip39(
     ///     *,

core/mocks/generated/trezorui2.pyi

@@ -349,7 +349,7 @@ def request_pin(
 
 
 # rust/src/ui/model_mercury/layout.rs
-def request_passphrase(
+def flow_request_passphrase(
     *,
     prompt: str,
     max_len: int,

core/mocks/trezortranslate_keys.pyi

@@ -487,6 +487,7 @@ class TR:
     nem__unknown_mosaic: str = "Unknown mosaic!"
     passphrase__access_wallet: str = "Access passphrase wallet?"
     passphrase__always_on_device: str = "Always enter your passphrase on Trezor?"
+    passphrase__continue_with_empty_passphrase: str = "Continue with empty passphrase?"
     passphrase__from_host_not_shown: str = "Passphrase provided by host will be used but will not be displayed due to the device settings."
     passphrase__hide: str = "Hide passphrase coming from host?"
     passphrase__next_screen_will_show_passphrase: str = "The next screen shows your passphrase."

core/src/trezor/ui/layouts/mercury/__init__.py

@@ -1374,7 +1374,7 @@ def show_wait_text(message: str) -> None:
 async def request_passphrase_on_device(max_len: int) -> str:
     result = await interact(
         RustLayout(
-            trezorui2.request_passphrase(
+            trezorui2.flow_request_passphrase(
                 prompt=TR.passphrase__title_enter, max_len=max_len
             )
         ),
@@ -1384,8 +1384,18 @@ async def request_passphrase_on_device(max_len: int) -> str:
     if result is CANCELLED:
         raise ActionCancelled("Passphrase entry cancelled")
 
-    assert isinstance(result, str)
-    return result
+    if __debug__:
+        if not isinstance(result, tuple):
+            # TODO: DebugLink problem, better comment or solution?
+            result = (CONFIRMED, str(result))
+
+    status, value = result
+    if status == CONFIRMED:
+        assert isinstance(value, str)
+        return value
+    else:
+        # flow_request_pin returns either CANCELLED or (CONFIRMED, str) so this branch shouldn't be taken
+        raise ActionCancelled("Passphrase entry cancelled")
 
 
 async def request_pin_on_device(

core/translations/en.json

@@ -489,6 +489,7 @@
     "nem__unknown_mosaic": "Unknown mosaic!",
     "passphrase__access_wallet": "Access passphrase wallet?",
     "passphrase__always_on_device": "Always enter your passphrase on Trezor?",
+    "passphrase__continue_with_empty_passphrase": "Continue with empty passphrase?",
     "passphrase__from_host_not_shown": "Passphrase provided by host will be used but will not be displayed due to the device settings.",
     "passphrase__wallet": "Passphrase wallet",
     "passphrase__hide": "Hide passphrase coming from host?",

core/translations/order.json

@@ -957,5 +957,6 @@
   "955": "brightness__change_title",
   "956": "words__title_done",
   "957": "reset__slip39_checklist_more_info_threshold",
-  "958": "reset__slip39_checklist_more_info_threshold_example_template"
+  "958": "reset__slip39_checklist_more_info_threshold_example_template",
+  "959": "passphrase__continue_with_empty_passphrase"
 }

tests/buttons.py

@@ -13,6 +13,20 @@ def grid(dim: int, grid_cells: int, cell: int) -> int:
     return cell * step + ofs
 
 
+def grid35(x: int, y: int) -> Coords:
+    return grid(DISPLAY_WIDTH, 3, x), grid(DISPLAY_HEIGHT, 5, y)
+
+
+def grid34(x: int, y: int) -> Coords:
+    return grid(DISPLAY_WIDTH, 3, x), grid(DISPLAY_HEIGHT, 4, y)
+
+
+def _grid34_from_index(idx: int) -> Coords:
+    grid_x = idx % 3
+    grid_y = idx // 3 + 1  # first line is empty
+    return grid34(grid_x, grid_y)
+
+
 LEFT = grid(DISPLAY_WIDTH, 3, 0)
 MID = grid(DISPLAY_WIDTH, 3, 1)
 RIGHT = grid(DISPLAY_WIDTH, 3, 2)
@@ -31,6 +45,9 @@ CORNER_BUTTON = (215, 25)
 CONFIRM_WORD = (MID, TOP)
 TOP_ROW = (MID, TOP)
 
+MERCURY_YES = grid34(2, 2)
+MERCURY_NO = grid34(0, 2)
+
 
 def reset_minus(model_internal_name: str) -> Coords:
     RESET_MINUS_T3T1 = (LEFT, grid(DISPLAY_HEIGHT, 5, 3))
@@ -109,20 +126,6 @@ def pin_passphrase_grid(idx: int) -> Coords:
     return grid35(grid_x, grid_y)
 
 
-def grid35(x: int, y: int) -> Coords:
-    return grid(DISPLAY_WIDTH, 3, x), grid(DISPLAY_HEIGHT, 5, y)
-
-
-def grid34(x: int, y: int) -> Coords:
-    return grid(DISPLAY_WIDTH, 3, x), grid(DISPLAY_HEIGHT, 4, y)
-
-
-def _grid34_from_index(idx: int) -> Coords:
-    grid_x = idx % 3
-    grid_y = idx // 3 + 1  # first line is empty
-    return grid34(grid_x, grid_y)
-
-
 def type_word(word: str, is_slip39: bool = False) -> Iterator[Coords]:
     if is_slip39:
         yield from _type_word_slip39(word)

tests/click_tests/test_passphrase_mercury.py

@@ -168,8 +168,11 @@ def input_passphrase(debug: "DebugLink", passphrase: str, check: bool = True) ->
 
 def enter_passphrase(debug: "DebugLink") -> None:
     """Enter a passphrase"""
-    coords = buttons.grid35(2, 0)  # top-right corner
+    is_empty: bool = len(debug.read_layout().passphrase()) == 0
+    coords = buttons.CORNER_BUTTON  # top-right corner
     debug.click(coords, wait=True)
+    if is_empty:
+        debug.click(buttons.MERCURY_YES)
 
 
 def delete_char(debug: "DebugLink") -> None:

tests/input_flows.py

@@ -1597,7 +1597,7 @@ class InputFlowSlip39BasicResetRecovery(InputFlowBase):
         # Mnemonic phrases
         self.mnemonics = yield from load_N_shares(self.debug, 5)
 
-        br = yield  # safety warning
+        br = yield  # success screen
         assert br.code == B.Success
         self.debug.press_yes()