feat(core): allow for going back to previous word in recovery process

core/.changelog.d/3458.added

@@ -0,0 +1 @@
+Allow for going back to previous word in recovery process

core/embed/rust/librust_qstr.h

@@ -143,6 +143,7 @@ static void _librust_qstrs(void) {
   MP_QSTR_buttons__try_again;
   MP_QSTR_buttons__turn_off;
   MP_QSTR_buttons__turn_on;
+  MP_QSTR_can_go_back;
   MP_QSTR_cancel_arrow;
   MP_QSTR_cancel_cross;
   MP_QSTR_cardano__addr_base;
@@ -431,6 +432,7 @@ static void _librust_qstrs(void) {
   MP_QSTR_inputs__cancel;
   MP_QSTR_inputs__delete;
   MP_QSTR_inputs__enter;
+  MP_QSTR_inputs__previous;
   MP_QSTR_inputs__return;
   MP_QSTR_inputs__show;
   MP_QSTR_inputs__space;
@@ -595,6 +597,7 @@ static void _librust_qstrs(void) {
   MP_QSTR_plurals__transaction_of_x_operations;
   MP_QSTR_plurals__x_groups_needed;
   MP_QSTR_plurals__x_shares_needed;
+  MP_QSTR_prefill_word;
   MP_QSTR_progress__authenticity_check;
   MP_QSTR_progress__done;
   MP_QSTR_progress__loading_transaction;

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

@@ -843,6 +843,7 @@ pub enum TranslatedString {
     words__writable = 830,
     words__yes = 831,
     reboot_to_bootloader__just_a_moment = 832,
+    inputs__previous = 833,
 }
 
 impl TranslatedString {
@@ -1681,6 +1682,7 @@ impl TranslatedString {
             Self::words__writable => "Writable",
             Self::words__yes => "Yes",
             Self::reboot_to_bootloader__just_a_moment => "Just a moment...",
+            Self::inputs__previous => "PREVIOUS",
         }
     }
 
@@ -2520,6 +2522,7 @@ impl TranslatedString {
             Qstr::MP_QSTR_words__writable => Some(Self::words__writable),
             Qstr::MP_QSTR_words__yes => Some(Self::words__yes),
             Qstr::MP_QSTR_reboot_to_bootloader__just_a_moment => Some(Self::reboot_to_bootloader__just_a_moment),
+            Qstr::MP_QSTR_inputs__previous => Some(Self::inputs__previous),
             _ => None,
         }
     }

core/embed/rust/src/ui/component/maybe.rs

@@ -11,7 +11,8 @@ pub struct Maybe<T> {
 }
 
 impl<T> Maybe<T> {
-    pub fn new(pad: Pad, inner: T, visible: bool) -> Self {
+    pub fn new(bg_color: Color, inner: T, visible: bool) -> Self {
+        let pad = Pad::with_background(bg_color);
         Self {
             inner,
             visible,
@@ -19,12 +20,12 @@ impl<T> Maybe<T> {
         }
     }
 
-    pub fn visible(clear: Color, inner: T) -> Self {
-        Self::new(Pad::with_background(clear), inner, true)
+    pub fn visible(bg_color: Color, inner: T) -> Self {
+        Self::new(bg_color, inner, true)
     }
 
-    pub fn hidden(clear: Color, inner: T) -> Self {
-        Self::new(Pad::with_background(clear), inner, false)
+    pub fn hidden(bg_color: Color, inner: T) -> Self {
+        Self::new(bg_color, inner, false)
     }
 }
 

core/embed/rust/src/ui/model_tr/component/input_methods/wordlist.rs

@@ -15,6 +15,7 @@ enum WordlistAction {
     Letter(char),
     Word(&'static str),
     Delete,
+    Previous,
 }
 
 const MAX_WORD_LENGTH: usize = 10;
@@ -47,6 +48,9 @@ struct ChoiceFactoryWordlist {
     offer_words: bool,
     /// We want to randomize the order in which we show the words
     word_random_order: Vec<usize, OFFER_WORDS_THRESHOLD>,
+    /// Whether the input is empty - and we should show PREVIOUS instead of
+    /// DELETE
+    empty_input: bool,
 }
 
 impl ChoiceFactoryWordlist {
@@ -72,6 +76,7 @@ impl ChoiceFactoryWordlist {
             wordlist,
             offer_words,
             word_random_order,
+            empty_input: prefix.is_empty(),
         }
     }
 }
@@ -93,17 +98,31 @@ impl ChoiceFactory for ChoiceFactoryWordlist {
         // Putting DELETE as the first option in both cases
         // (is a requirement for WORDS, doing it for LETTERS as well to unite it)
         if choice_index == DELETE_INDEX {
-            return (
-                TR::inputs__delete.map_translated(|t| {
-                    ChoiceItem::new(
-                        t,
-                        ButtonLayout::arrow_armed_arrow(TR::buttons__confirm.into()),
-                    )
-                    .with_icon(theme::ICON_DELETE)
-                    .with_middle_action_without_release()
-                }),
-                WordlistAction::Delete,
-            );
+            if self.empty_input {
+                return (
+                    TR::inputs__previous.map_translated(|t| {
+                        ChoiceItem::new(
+                            t,
+                            ButtonLayout::arrow_armed_arrow(TR::buttons__select.into()),
+                        )
+                        .with_icon(theme::ICON_DELETE)
+                        .with_middle_action_without_release()
+                    }),
+                    WordlistAction::Previous,
+                );
+            } else {
+                return (
+                    TR::inputs__delete.map_translated(|t| {
+                        ChoiceItem::new(
+                            t,
+                            ButtonLayout::arrow_armed_arrow(TR::buttons__select.into()),
+                        )
+                        .with_icon(theme::ICON_DELETE)
+                        .with_middle_action_without_release()
+                    }),
+                    WordlistAction::Delete,
+                );
+            }
         }
         if self.offer_words {
             // Taking a random (but always the same) word on this position
@@ -140,10 +159,12 @@ pub struct WordlistEntry {
     textbox: TextBox<MAX_WORD_LENGTH>,
     offer_words: bool,
     wordlist_type: WordlistType,
+    /// Whether going back is allowed (is not on the very first word).
+    can_go_back: bool,
 }
 
 impl WordlistEntry {
-    pub fn new(wordlist_type: WordlistType) -> Self {
+    pub fn new(wordlist_type: WordlistType, can_go_back: bool) -> Self {
         let choices = ChoiceFactoryWordlist::new(wordlist_type, "");
         let choices_count = <ChoiceFactoryWordlist as ChoiceFactory>::count(&choices);
         Self {
@@ -156,6 +177,27 @@ impl WordlistEntry {
             textbox: TextBox::empty(),
             offer_words: false,
             wordlist_type,
+            can_go_back,
+        }
+    }
+
+    pub fn prefilled_word(word: &str, wordlist_type: WordlistType, can_go_back: bool) -> Self {
+        // Word may be empty string, fallback to normal input
+        if word.is_empty() {
+            return Self::new(wordlist_type, can_go_back);
+        }
+
+        let choices = ChoiceFactoryWordlist::new(wordlist_type, word);
+        Self {
+            // Showing the chosen word at index 1
+            choice_page: ChoicePage::new(choices)
+                .with_incomplete(true)
+                .with_initial_page_counter(1),
+            chosen_letters: Child::new(ChangingTextLine::center_mono(String::from(word))),
+            textbox: TextBox::new(String::from(word)),
+            offer_words: false,
+            wordlist_type,
+            can_go_back,
         }
     }
 
@@ -238,6 +280,11 @@ impl Component for WordlistEntry {
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         if let Some((action, long_press)) = self.choice_page.event(ctx, event) {
             match action {
+                WordlistAction::Previous => {
+                    if self.can_go_back {
+                        return Some("");
+                    }
+                }
                 WordlistAction::Delete => {
                     // Deleting all when long-pressed
                     if long_press {

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

@@ -1347,9 +1347,19 @@ extern "C" fn new_request_passphrase(n_args: usize, args: *const Obj, kwargs: *m
 extern "C" fn new_request_bip39(n_args: usize, args: *const Obj, kwargs: *mut Map) -> Obj {
     let block = |_args: &[Obj], kwargs: &Map| {
         let prompt: StrBuffer = kwargs.get(Qstr::MP_QSTR_prompt)?.try_into()?;
+        let prefill_word: StrBuffer = kwargs.get(Qstr::MP_QSTR_prefill_word)?.try_into()?;
+        let can_go_back: bool = kwargs.get(Qstr::MP_QSTR_can_go_back)?.try_into()?;
 
         let obj = LayoutObj::new(
-            Frame::new(prompt, WordlistEntry::new(WordlistType::Bip39)).with_title_centered(),
+            Frame::new(
+                prompt,
+                WordlistEntry::prefilled_word(
+                    prefill_word.as_ref(),
+                    WordlistType::Bip39,
+                    can_go_back,
+                ),
+            )
+            .with_title_centered(),
         )?;
         Ok(obj.into())
     };
@@ -1359,9 +1369,19 @@ extern "C" fn new_request_bip39(n_args: usize, args: *const Obj, kwargs: *mut Ma
 extern "C" fn new_request_slip39(n_args: usize, args: *const Obj, kwargs: *mut Map) -> Obj {
     let block = |_args: &[Obj], kwargs: &Map| {
         let prompt: StrBuffer = kwargs.get(Qstr::MP_QSTR_prompt)?.try_into()?;
+        let prefill_word: StrBuffer = kwargs.get(Qstr::MP_QSTR_prefill_word)?.try_into()?;
+        let can_go_back: bool = kwargs.get(Qstr::MP_QSTR_can_go_back)?.try_into()?;
 
         let obj = LayoutObj::new(
-            Frame::new(prompt, WordlistEntry::new(WordlistType::Slip39)).with_title_centered(),
+            Frame::new(
+                prompt,
+                WordlistEntry::prefilled_word(
+                    prefill_word.as_ref(),
+                    WordlistType::Slip39,
+                    can_go_back,
+                ),
+            )
+            .with_title_centered(),
         )?;
         Ok(obj.into())
     };
@@ -1972,6 +1992,8 @@ pub static mp_module_trezorui2: Module = obj_module! {
     /// def request_bip39(
     ///     *,
     ///     prompt: str,
+    ///     prefill_word: str,
+    ///     can_go_back: bool,
     /// ) -> str:
     ///     """Get recovery word for BIP39."""
     Qstr::MP_QSTR_request_bip39 => obj_fn_kw!(0, new_request_bip39).as_obj(),
@@ -1979,6 +2001,8 @@ pub static mp_module_trezorui2: Module = obj_module! {
     /// def request_slip39(
     ///     *,
     ///     prompt: str,
+    ///     prefill_word: str,
+    ///     can_go_back: bool,
     /// ) -> str:
     ///    """SLIP39 word input keyboard."""
     Qstr::MP_QSTR_request_slip39 => obj_fn_kw!(0, new_request_slip39).as_obj(),

core/embed/rust/src/ui/model_tr/theme/mod.rs

@@ -63,6 +63,7 @@ pub fn textstyle_number(num: i32) -> &'static TextStyle {
 include_icon!(ICON_ARM_LEFT, "model_tr/res/arm_left.toif"); // 10*6
 include_icon!(ICON_ARM_RIGHT, "model_tr/res/arm_right.toif"); // 10*6
 include_icon!(ICON_ARROW_LEFT, "model_tr/res/arrow_left.toif"); // 4*7
+include_icon!(ICON_ARROW_LEFT_BIG, "model_tr/res/arrow_left_big.toif"); // 8*7
 include_icon!(ICON_ARROW_RIGHT, "model_tr/res/arrow_right.toif"); // 4*7
 include_icon!(ICON_ARROW_RIGHT_FAT, "model_tr/res/arrow_right_fat.toif"); // 4*8
 include_icon!(

core/embed/rust/src/ui/model_tt/component/keyboard/bip39.rs

@@ -16,6 +16,7 @@ use crate::{
         },
     },
 };
+use heapless::String;
 
 const MAX_LENGTH: usize = 8;
 
@@ -171,6 +172,23 @@ impl Bip39Input {
         }
     }
 
+    pub fn prefilled_word(word: &str) -> Self {
+        // Word may be empty string, fallback to normal input
+        if word.is_empty() {
+            return Self::new();
+        }
+
+        // Styling the input to reflect already filled word
+        Self {
+            button: Button::with_icon(theme::ICON_LIST_CHECK).styled(theme::button_pin_confirm()),
+            textbox: TextBox::new(String::from(word)),
+            multi_tap: MultiTapKeyboard::new(),
+            options_num: bip39::options_num(word),
+            suggested_word: bip39::complete_word(word),
+            button_suggestion: Button::empty().styled(theme::button_suggestion_confirm()),
+        }
+    }
+
     /// Compute a bitmask of all letters contained in given key text. Lowest bit
     /// is 'a', second lowest 'b', etc.
     fn key_mask(key: usize) -> u32 {

core/embed/rust/src/ui/model_tt/component/keyboard/mnemonic.rs

@@ -2,7 +2,7 @@ use crate::ui::{
     component::{maybe::paint_overlapping, Child, Component, Event, EventCtx, Label, Maybe},
     geometry::{Alignment2D, Grid, Offset, Rect},
     model_tt::{
-        component::{Button, ButtonMsg},
+        component::{Button, ButtonMsg, Swipe, SwipeDirection},
         theme,
     },
 };
@@ -11,6 +11,7 @@ pub const MNEMONIC_KEY_COUNT: usize = 9;
 
 pub enum MnemonicKeyboardMsg {
     Confirmed,
+    Previous,
 }
 
 pub struct MnemonicKeyboard<T, U> {
@@ -22,6 +23,10 @@ pub struct MnemonicKeyboard<T, U> {
     input: Child<Maybe<T>>,
     /// Key buttons.
     keys: [Child<Button<&'static str>>; MNEMONIC_KEY_COUNT],
+    /// Swipe controller - allowing for going to the previous word.
+    swipe: Swipe,
+    /// Whether going back is allowed (is not on the very first word).
+    can_go_back: bool,
 }
 
 impl<T, U> MnemonicKeyboard<T, U>
@@ -29,13 +34,17 @@ where
     T: MnemonicInput,
     U: AsRef<str>,
 {
-    pub fn new(input: T, prompt: U) -> Self {
+    pub fn new(input: T, prompt: U, can_go_back: bool) -> Self {
+        // Input might be already pre-filled
+        let prompt_visible = input.is_empty();
+
         Self {
-            prompt: Child::new(Maybe::visible(
+            prompt: Child::new(Maybe::new(
                 theme::BG,
                 Label::centered(prompt, theme::label_keyboard_prompt()),
+                prompt_visible,
             )),
-            back: Child::new(Maybe::hidden(
+            back: Child::new(Maybe::new(
                 theme::BG,
                 Button::with_icon_blend(
                     theme::IMAGE_BG_BACK_BTN_TALL,
@@ -44,11 +53,14 @@ where
                 )
                 .styled(theme::button_reset())
                 .with_long_press(theme::ERASE_HOLD_DURATION),
+                !prompt_visible,
             )),
-            input: Child::new(Maybe::hidden(theme::BG, input)),
+            input: Child::new(Maybe::new(theme::BG, input, !prompt_visible)),
             keys: T::keys()
                 .map(|t| Button::with_text(t).styled(theme::button_pin()))
                 .map(Child::new),
+            swipe: Swipe::new().right(),
+            can_go_back,
         }
     }
 
@@ -106,6 +118,7 @@ where
         let prompt_size = self.prompt.inner().inner().max_size();
         let prompt_area = Rect::snap(prompt_center, prompt_size, Alignment2D::CENTER);
 
+        self.swipe.place(bounds);
         self.prompt.place(prompt_area);
         self.back.place(back_area);
         self.input.place(input_area);
@@ -116,6 +129,13 @@ where
     }
 
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
+        // Swipe will cause going back to the previous word when allowed.
+        if self.can_go_back {
+            if let Some(SwipeDirection::Right) = self.swipe.event(ctx, event) {
+                return Some(MnemonicKeyboardMsg::Previous);
+            }
+        }
+
         match self.input.event(ctx, event) {
             Some(MnemonicInputMsg::Confirmed) => {
                 // Confirmed, bubble up.

core/embed/rust/src/ui/model_tt/component/keyboard/pin.rs

@@ -79,8 +79,7 @@ where
         let erase_btn = Maybe::hidden(theme::BG, erase_btn).into_child();
 
         let cancel_btn = Button::with_icon(theme::ICON_CANCEL).styled(theme::button_cancel());
-        let cancel_btn =
-            Maybe::new(Pad::with_background(theme::BG), cancel_btn, allow_cancel).into_child();
+        let cancel_btn = Maybe::new(theme::BG, cancel_btn, allow_cancel).into_child();
 
         Self {
             allow_cancel,

core/embed/rust/src/ui/model_tt/component/keyboard/slip39.rs

@@ -203,6 +203,61 @@ impl Slip39Input {
         }
     }
 
+    pub fn prefilled_word(word: &str) -> Self {
+        // Word may be empty string, fallback to normal input
+        if word.is_empty() {
+            return Self::new();
+        }
+
+        let (buff, input_mask, final_word) = Self::setup_from_prefilled_word(word);
+
+        Self {
+            // Button has the same style the whole time
+            button: Button::empty().styled(theme::button_pin_confirm()),
+            textbox: TextBox::new(buff),
+            multi_tap: MultiTapKeyboard::new(),
+            final_word,
+            input_mask,
+        }
+    }
+
+    fn setup_from_prefilled_word(
+        word: &str,
+    ) -> (String<MAX_LENGTH>, Slip39Mask, Option<&'static str>) {
+        let mut buff: String<MAX_LENGTH> = String::new();
+
+        // Gradually appending encoded key digits to the buffer and checking if
+        // have not already formed a final word.
+        for ch in word.chars() {
+            let mut index = 0;
+            for (i, key) in Self::keys().iter().enumerate() {
+                if key.contains(ch) {
+                    index = i;
+                    break;
+                }
+            }
+            buff.push(Self::key_digit(index))
+                .assert_if_debugging_ui("Text buffer is too small");
+
+            let sequence: Option<u16> = buff.parse().ok();
+            let input_mask = sequence
+                .and_then(slip39::word_completion_mask)
+                .map(Slip39Mask)
+                .unwrap_or_else(Slip39Mask::full);
+            let final_word = if input_mask.is_final() {
+                sequence.and_then(slip39::button_sequence_to_word)
+            } else {
+                None
+            };
+
+            // As soon as we have a final word, we can stop.
+            if final_word.is_some() {
+                return (buff, input_mask, final_word);
+            }
+        }
+        (buff, Slip39Mask::full(), None)
+    }
+
     /// Convert a key index into the key digit. This is what we push into the
     /// input buffer.
     ///

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

@@ -177,6 +177,7 @@ where
                     panic!("invalid mnemonic")
                 }
             }
+            MnemonicKeyboardMsg::Previous => "".try_into(),
         }
     }
 }
@@ -1270,7 +1271,13 @@ extern "C" fn new_request_passphrase(n_args: usize, args: *const Obj, kwargs: *m
 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: StrBuffer = kwargs.get(Qstr::MP_QSTR_prompt)?.try_into()?;
-        let obj = LayoutObj::new(MnemonicKeyboard::new(Bip39Input::new(), prompt))?;
+        let prefill_word: StrBuffer = kwargs.get(Qstr::MP_QSTR_prefill_word)?.try_into()?;
+        let can_go_back: bool = kwargs.get(Qstr::MP_QSTR_can_go_back)?.try_into()?;
+        let obj = LayoutObj::new(MnemonicKeyboard::new(
+            Bip39Input::prefilled_word(prefill_word.as_ref()),
+            prompt,
+            can_go_back,
+        ))?;
         Ok(obj.into())
     };
     unsafe { util::try_with_args_and_kwargs(n_args, args, kwargs, block) }
@@ -1279,7 +1286,13 @@ extern "C" fn new_request_bip39(n_args: usize, args: *const Obj, kwargs: *mut Ma
 extern "C" fn new_request_slip39(n_args: usize, args: *const Obj, kwargs: *mut Map) -> Obj {
     let block = move |_args: &[Obj], kwargs: &Map| {
         let prompt: StrBuffer = kwargs.get(Qstr::MP_QSTR_prompt)?.try_into()?;
-        let obj = LayoutObj::new(MnemonicKeyboard::new(Slip39Input::new(), prompt))?;
+        let prefill_word: StrBuffer = kwargs.get(Qstr::MP_QSTR_prefill_word)?.try_into()?;
+        let can_go_back: bool = kwargs.get(Qstr::MP_QSTR_can_go_back)?.try_into()?;
+        let obj = LayoutObj::new(MnemonicKeyboard::new(
+            Slip39Input::prefilled_word(prefill_word.as_ref()),
+            prompt,
+            can_go_back,
+        ))?;
         Ok(obj.into())
     };
     unsafe { util::try_with_args_and_kwargs(n_args, args, kwargs, block) }
@@ -1936,6 +1949,8 @@ pub static mp_module_trezorui2: Module = obj_module! {
     /// def request_bip39(
     ///     *,
     ///     prompt: str,
+    ///     prefill_word: str,
+    ///     can_go_back: bool,
     /// ) -> str:
     ///     """BIP39 word input keyboard."""
     Qstr::MP_QSTR_request_bip39 => obj_fn_kw!(0, new_request_bip39).as_obj(),
@@ -1943,6 +1958,8 @@ pub static mp_module_trezorui2: Module = obj_module! {
     /// def request_slip39(
     ///     *,
     ///     prompt: str,
+    ///     prefill_word: str,
+    ///     can_go_back: bool,
     /// ) -> str:
     ///     """SLIP39 word input keyboard."""
     Qstr::MP_QSTR_request_slip39 => obj_fn_kw!(0, new_request_slip39).as_obj(),

core/mocks/generated/trezorui2.pyi

@@ -308,6 +308,8 @@ def request_passphrase(
 def request_bip39(
     *,
     prompt: str,
+    prefill_word: str,
+    can_go_back: bool,
 ) -> str:
     """Get recovery word for BIP39."""
 
@@ -316,6 +318,8 @@ def request_bip39(
 def request_slip39(
     *,
     prompt: str,
+    prefill_word: str,
+    can_go_back: bool,
 ) -> str:
    """SLIP39 word input keyboard."""
 
@@ -756,6 +760,8 @@ def request_passphrase(
 def request_bip39(
     *,
     prompt: str,
+    prefill_word: str,
+    can_go_back: bool,
 ) -> str:
     """BIP39 word input keyboard."""
 
@@ -764,6 +770,8 @@ def request_bip39(
 def request_slip39(
     *,
     prompt: str,
+    prefill_word: str,
+    can_go_back: bool,
 ) -> str:
     """SLIP39 word input keyboard."""
 

core/mocks/trezortranslate_keys.pyi

@@ -337,6 +337,7 @@ class TR:
     inputs__cancel: str = "CANCEL"
     inputs__delete: str = "DELETE"
     inputs__enter: str = "ENTER"
+    inputs__previous: str = "PREVIOUS"
     inputs__return: str = "RETURN"
     inputs__show: str = "SHOW"
     inputs__space: str = "SPACE"

core/src/apps/management/recovery_device/layout.py

@@ -50,15 +50,35 @@ async def request_mnemonic(
 
     await button_request("mnemonic", code=ButtonRequestType.MnemonicInput)
 
-    words: list[str] = []
-    for i in range(word_count):
+    # Allowing to go back to previous words, therefore cannot use just loop over range(word_count)
+    words: list[str] = [""] * word_count
+    i = 0
+    while True:
+        # All the words have been entered
+        if i >= word_count:
+            break
+
+        # Prefilling the previously inputted word in case of going back
         word = await request_word(
-            i, word_count, is_slip39=backup_types.is_slip39_word_count(word_count)
+            i,
+            word_count,
+            is_slip39=backup_types.is_slip39_word_count(word_count),
+            prefill_word=words[i],
         )
-        words.append(word)
+
+        # User has decided to go back
+        if not word:
+            if i > 0:
+                i -= 1
+            continue
+
+        words[i] = word
+
+        i += 1
 
         try:
-            word_validity.check(backup_type, words)
+            non_empty_words = [word for word in words if word]
+            word_validity.check(backup_type, non_empty_words)
         except word_validity.AlreadyAdded:
             # show_share_already_added
             await show_recovery_warning(

core/src/trezor/ui/layouts/tr/recovery.py

@@ -18,15 +18,27 @@ async def request_word_count(dry_run: bool) -> int:
     return int(count)
 
 
-async def request_word(word_index: int, word_count: int, is_slip39: bool) -> str:
+async def request_word(
+    word_index: int, word_count: int, is_slip39: bool, prefill_word: str = ""
+) -> str:
     from trezor.wire.context import wait
 
     prompt = TR.recovery__word_x_of_y_template.format(word_index + 1, word_count)
 
+    can_go_back = word_index > 0
+
     if is_slip39:
-        word_choice = RustLayout(trezorui2.request_slip39(prompt=prompt))
+        word_choice = RustLayout(
+            trezorui2.request_slip39(
+                prompt=prompt, prefill_word=prefill_word, can_go_back=can_go_back
+            )
+        )
     else:
-        word_choice = RustLayout(trezorui2.request_bip39(prompt=prompt))
+        word_choice = RustLayout(
+            trezorui2.request_bip39(
+                prompt=prompt, prefill_word=prefill_word, can_go_back=can_go_back
+            )
+        )
 
     word: str = await wait(word_choice)
     return word

core/src/trezor/ui/layouts/tt/recovery.py

@@ -32,12 +32,23 @@ async def request_word_count(dry_run: bool) -> int:
     return int(count)
 
 
-async def request_word(word_index: int, word_count: int, is_slip39: bool) -> str:
+async def request_word(
+    word_index: int, word_count: int, is_slip39: bool, prefill_word: str = ""
+) -> str:
     prompt = TR.recovery__type_word_x_of_y_template.format(word_index + 1, word_count)
+    can_go_back = word_index > 0
     if is_slip39:
-        keyboard = RustLayout(trezorui2.request_slip39(prompt=prompt))
+        keyboard = RustLayout(
+            trezorui2.request_slip39(
+                prompt=prompt, prefill_word=prefill_word, can_go_back=can_go_back
+            )
+        )
     else:
-        keyboard = RustLayout(trezorui2.request_bip39(prompt=prompt))
+        keyboard = RustLayout(
+            trezorui2.request_bip39(
+                prompt=prompt, prefill_word=prefill_word, can_go_back=can_go_back
+            )
+        )
 
     word: str = await ctx_wait(keyboard)
     return word

core/tools/translations/translate_missing.py

@@ -19,7 +19,7 @@ def translate_dict(
                 translated_text = translator.translate(
                     value, src=from_lang, dest=to_lang
                 ).text
-                new_dict[key] = translated_text + " (TODO)"
+                new_dict[key] = translated_text
             except Exception as e:
                 print(f"Error translating {value}: {e}")
                 new_dict[key] = MISSING_VALUE

core/translations/cs.json

@@ -355,6 +355,7 @@
     "inputs__cancel": "ZRUŠIT",
     "inputs__delete": "SMAZAT",
     "inputs__enter": "ZADAT",
+    "inputs__previous": "PŘEDCHOZÍ",
     "inputs__return": "VRÁTIT",
     "inputs__show": "UKÁZAT",
     "inputs__space": "MEZERNÍK",
@@ -512,6 +513,7 @@
     "progress__signing_transaction": "Podpis transakce...",
     "progress__syncing": "Synchronizace...",
     "progress__x_seconds_left_template": "Zbývá {} sekund",
+    "reboot_to_bootloader__just_a_moment": "Jenom chvilku...",
     "reboot_to_bootloader__restart": "Chcete restartovat Trezor v režimu bootloader?",
     "reboot_to_bootloader__title": "PŘEJÍT DO REŽIMU BOOTLOADER",
     "reboot_to_bootloader__version_by_template": "Verze firmwaru {}\nod {}",

core/translations/de.json

@@ -355,6 +355,7 @@
     "inputs__cancel": "ABBRECHEN",
     "inputs__delete": "LÖSCHEN",
     "inputs__enter": "EINGEBEN",
+    "inputs__previous": "VORHERIGE",
     "inputs__return": "ZURÜCK",
     "inputs__show": "ANZEIGEN",
     "inputs__space": "LEER",
@@ -512,6 +513,7 @@
     "progress__signing_transaction": "Transaktion wird signiert...",
     "progress__syncing": "Wird synchronisiert...",
     "progress__x_seconds_left_template": "{} Sekunden verbleibend",
+    "reboot_to_bootloader__just_a_moment": "Einen Augenblick...",
     "reboot_to_bootloader__restart": "Möchtest du Trezor im Bootloader-Modus neu starten?",
     "reboot_to_bootloader__title": "ZUM BOOTLOADER",
     "reboot_to_bootloader__version_by_template": "Firmware Version {}\nvon {}",

core/translations/en.json

@@ -343,6 +343,7 @@
     "inputs__delete": "DELETE",
     "inputs__enter": "ENTER",
     "inputs__return": "RETURN",
+    "inputs__previous": "PREVIOUS",
     "inputs__show": "SHOW",
     "inputs__space": "SPACE",
     "joint__title": "JOINT TRANSACTION",

core/translations/es.json

@@ -355,6 +355,7 @@
     "inputs__cancel": "CANCELAR",
     "inputs__delete": "ELIMINAR",
     "inputs__enter": "INTRODUCIR",
+    "inputs__previous": "ANTERIOR",
     "inputs__return": "VOLVER",
     "inputs__show": "MOSTRAR",
     "inputs__space": "ESPACIO",
@@ -512,6 +513,7 @@
     "progress__signing_transaction": "Firmando transacción...",
     "progress__syncing": "Sincronizando...",
     "progress__x_seconds_left_template": "Quedan {} segundos",
+    "reboot_to_bootloader__just_a_moment": "Sólo un momento...",
     "reboot_to_bootloader__restart": "¿Deseas reiniciar el Trezor en modo bootloader?",
     "reboot_to_bootloader__title": "IR A BOOTLOADER",
     "reboot_to_bootloader__version_by_template": "Versión de firmware {}\npor {}",

core/translations/fr.json

@@ -355,6 +355,7 @@
     "inputs__cancel": "ANNULER",
     "inputs__delete": "SUPPRIMER",
     "inputs__enter": "SAISIR",
+    "inputs__previous": "PREVIOUS",
     "inputs__return": "RETOUR",
     "inputs__show": "AFFICHER",
     "inputs__space": "ESPACE",
@@ -512,6 +513,7 @@
     "progress__signing_transaction": "Signature de la transaction en cours",
     "progress__syncing": "Synchronisation en cours",
     "progress__x_seconds_left_template": "{} secondes restantes",
+    "reboot_to_bootloader__just_a_moment": "Juste un moment...",
     "reboot_to_bootloader__restart": "Voulez-vous redémarrer Trezor en mode bootloader?",
     "reboot_to_bootloader__title": "ACCÉDER BOOTLOADER",
     "reboot_to_bootloader__version_by_template": "Version du firmware {}\npar {}",

core/translations/order.json

@@ -831,5 +831,6 @@
   "829": "words__warning",
   "830": "words__writable",
   "831": "words__yes",
-  "832": "reboot_to_bootloader__just_a_moment"
+  "832": "reboot_to_bootloader__just_a_moment",
+  "833": "inputs__previous"
 }

tests/buttons.py

@@ -24,6 +24,8 @@ OK = (RIGHT, BOTTOM)
 CANCEL = (LEFT, BOTTOM)
 INFO = (MID, BOTTOM)
 
+RECOVERY_DELETE = (LEFT, TOP)
+
 CORNER_BUTTON = (215, 25)
 
 CONFIRM_WORD = (MID, TOP)

tests/click_tests/common.py

@@ -4,6 +4,7 @@ from enum import Enum
 from typing import TYPE_CHECKING
 
 from .. import buttons
+from .. import translations as TR
 
 if TYPE_CHECKING:
     from trezorlib.debuglink import DebugLink, LayoutContent
@@ -147,3 +148,7 @@ def _move_one_closer(
             return debug.press_left(wait=True)
         else:
             return debug.press_right(wait=True)
+
+
+def get_possible_btn_texts(path: str) -> str:
+    return "|".join(TR.translate(path))

tests/click_tests/recovery.py

@@ -2,12 +2,17 @@ from typing import TYPE_CHECKING
 
 from .. import buttons
 from .. import translations as TR
-from .common import go_next
+from .common import get_possible_btn_texts, go_next
 
 if TYPE_CHECKING:
     from trezorlib.debuglink import DebugLink, LayoutContent
 
 
+DELETE_BTN_TEXTS = get_possible_btn_texts("inputs__delete") + get_possible_btn_texts(
+    "inputs__previous"
+)
+
+
 def enter_word(
     debug: "DebugLink", word: str, is_slip39: bool = False
 ) -> "LayoutContent":
@@ -117,6 +122,60 @@ def enter_shares(debug: "DebugLink", shares: list[str]) -> None:
 
 
 def enter_seed(debug: "DebugLink", seed_words: list[str]) -> None:
+    prepare_enter_seed(debug)
+
+    for word in seed_words:
+        enter_word(debug, word, is_slip39=False)
+
+    TR.assert_in(debug.read_layout().text_content(), "recovery__wallet_recovered")
+
+
+def enter_seed_previous_correct(
+    debug: "DebugLink", seed_words: list[str], bad_indexes: dict[int, str]
+) -> None:
+    prepare_enter_seed(debug)
+
+    i = 0
+    go_back = False
+    bad_word = ""
+    while True:
+        assert i >= 0
+
+        if i >= len(seed_words):
+            break
+
+        if go_back:
+            go_back = False
+            if debug.model == "T":
+                debug.swipe_right(wait=True)
+                for _ in range(len(bad_word)):
+                    debug.click(buttons.RECOVERY_DELETE, wait=True)
+            elif debug.model == "Safe 3":
+                layout = debug.read_layout()
+
+                while layout.get_middle_choice() not in DELETE_BTN_TEXTS:
+                    layout = debug.press_right(wait=True)
+                layout = debug.press_middle(wait=True)
+
+                for _ in range(len(bad_word)):
+                    while layout.get_middle_choice() not in DELETE_BTN_TEXTS:
+                        layout = debug.press_left(wait=True)
+                    layout = debug.press_middle(wait=True)
+            continue
+
+        if i in bad_indexes:
+            word = bad_indexes.pop(i)
+            bad_word = word
+            go_back = True
+        else:
+            word = seed_words[i]
+            i += 1
+        layout = enter_word(debug, word, is_slip39=False)
+
+    TR.assert_in(debug.read_layout().text_content(), "recovery__wallet_recovered")
+
+
+def prepare_enter_seed(debug: "DebugLink") -> None:
     TR.assert_in(debug.read_layout().text_content(), "recovery__enter_backup")
     if debug.model == "T":
         debug.click(buttons.OK, wait=True)
@@ -124,14 +183,8 @@ def enter_seed(debug: "DebugLink", seed_words: list[str]) -> None:
         debug.press_right(wait=True)
         TR.assert_equals(debug.read_layout().title(), "recovery__title_recover")
         debug.press_right()
-
-        debug.press_right(wait=True)
-
-    assert "MnemonicKeyboard" in debug.read_layout().all_components()
-    for word in seed_words:
-        enter_word(debug, word, is_slip39=False)
-
-    TR.assert_in(debug.read_layout().text_content(), "recovery__wallet_recovered")
+        layout = debug.press_right(wait=True)
+        assert "MnemonicKeyboard" in layout.all_components()
 
 
 def finalize(debug: "DebugLink") -> None:

tests/click_tests/test_pin.py

@@ -24,7 +24,12 @@ from trezorlib import device, exceptions
 
 from .. import buttons
 from .. import translations as TR
-from .common import go_back, go_next, navigate_to_action_and_press
+from .common import (
+    get_possible_btn_texts,
+    go_back,
+    go_next,
+    navigate_to_action_and_press,
+)
 
 if TYPE_CHECKING:
     from trezorlib.debuglink import DebugLink
@@ -42,14 +47,9 @@ PIN24 = "875163065288639289952973"
 PIN50 = "31415926535897932384626433832795028841971693993751"
 PIN60 = PIN50 + "9" * 10
 
-
-def _get_possible_btns(path: str) -> str:
-    return "|".join(TR.translate(path))
-
-
-DELETE = _get_possible_btns("inputs__delete")
-SHOW = _get_possible_btns("inputs__show")
-ENTER = _get_possible_btns("inputs__enter")
+DELETE = get_possible_btn_texts("inputs__delete")
+SHOW = get_possible_btn_texts("inputs__show")
+ENTER = get_possible_btn_texts("inputs__enter")
 
 
 TR_PIN_ACTIONS = [

tests/click_tests/test_recovery.py

@@ -68,3 +68,15 @@ def test_recovery_bip39(device_handler: "BackgroundDeviceHandler"):
         recovery.select_number_of_words(debug, num_of_words=12)
         recovery.enter_seed(debug, MNEMONIC12.split())
         recovery.finalize(debug)
+
+
+@pytest.mark.setup_client(uninitialized=True)
+def test_recovery_bip39_previous_word(device_handler: "BackgroundDeviceHandler"):
+    with prepare_recovery_and_evaluate(device_handler) as debug:
+        recovery.confirm_recovery(debug)
+
+        recovery.select_number_of_words(debug, num_of_words=12)
+        seed_words: list[str] = MNEMONIC12.split()
+        bad_indexes = {1: seed_words[-1], 7: seed_words[0]}
+        recovery.enter_seed_previous_correct(debug, seed_words, bad_indexes)
+        recovery.finalize(debug)

tests/ui_tests/fixtures.json

@@ -848,8 +848,9 @@
 "TR_en_test_pin.py::test_pin_short": "a87619c455ec81763cbb133279f9e7fbb3b9a5a02c58e1da63640d51a4e107c3",
 "TR_en_test_pin.py::test_wipe_code_same_as_pin": "329962b3b949dc1429d361e4ae6c5224b4a75c981ae833fd3bf1618df44fbd2a",
 "TR_en_test_pin.py::test_wipe_code_setup": "4afe5ceb8f953892eea8b6b7c6997a1b5afa40b81372265a84a567b61773d89b",
-"TR_en_test_recovery.py::test_recovery_bip39": "43a56fb1dea38503cfddf55c4a6e8d5a5188be7354bd5c2b31fde197f2af3443",
-"TR_en_test_recovery.py::test_recovery_slip39_basic": "40df8fd6302577ff4f1d1d6d214d1ffd22791912ee4225ae86460a3fa3f3ac0f",
+"TR_en_test_recovery.py::test_recovery_bip39": "f70c19e62380af74f43fbfa5fb75c03db47417348477298c51c88e37f1240444",
+"TR_en_test_recovery.py::test_recovery_bip39_previous_word": "c3b2bd8858c6ab627905cb49f122281b08e2ce6965f49baabdcd419c68affe09",
+"TR_en_test_recovery.py::test_recovery_slip39_basic": "a5afe54583805edf3b9f5f07778237b6a2f1b5c6d20db998cde78f5a3714c0de",
 "TR_en_test_reset_bip39.py::test_reset_bip39": "5ae502b3041376c4dac8de8b315242e20c29e76cbd93acc81790b61a65bb2401",
 "TR_en_test_reset_slip39_advanced.py::test_reset_slip39_advanced[16of16]": "53763c7177a26069cc164a84d93c6b6b53bfe3f58a770913b4b62b537fd9301d",
 "TR_en_test_reset_slip39_advanced.py::test_reset_slip39_advanced[2of2]": "ae94835bc49ebce6fdaa05671734701f6d2911cdee54e99e083edddbb070ffa7",
@@ -7637,6 +7638,7 @@
 "TT_en_test_pin.py::test_wipe_code_same_as_pin": "f13b6559d4d73c2853218fee85dc951c41c5b4e3867ee0e989443940233f2f96",
 "TT_en_test_pin.py::test_wipe_code_setup": "3d6a04cc7c8d3a061758a9559277a548bf4492ef59afd1d040693372d197383c",
 "TT_en_test_recovery.py::test_recovery_bip39": "65a138f634806c6483c55c6ce5365b8a7a4073a3c0c340b1826042262faa8545",
+"TT_en_test_recovery.py::test_recovery_bip39_previous_word": "a009899ccd3305cb6737c8fa645cc9eedf4e46d6669a621a07d8cd9447d80f2f",
 "TT_en_test_recovery.py::test_recovery_slip39_basic": "9b0f5a7b8d2ab0fed1e5389076bc035e24dce377d275824220f1aa61e9bb4810",
 "TT_en_test_reset_bip39.py::test_reset_bip39": "19fd9f6233d72224696c547528a0079934a86cb41539b6f7149aab57b0aaec42",
 "TT_en_test_reset_slip39_advanced.py::test_reset_slip39_advanced[16of16]": "1d604f1766ce861e616745dcb5c89122165eb26ecc7f40039e50b8fe8c61a861",