Handle decrypted text from encrypted QR codes

Author: earthdiver

src/seedsigner/gui/screens/tools_screens.py

@@ -1136,14 +1136,16 @@ def _run(self):
 class ToolsTextQRReviewTextScreen(ButtonListScreen):
     textToEncode: str = None
     title: str = None
+    max_lines: int = 5
+    visible_space: bool = True
 
     def __post_init__(self):
         # Customize defaults
         self.is_bottom_list = True
 
         super().__post_init__()
 
-        if " " in self.textToEncode:
+        if self.visible_space and " " in self.textToEncode:
             self.textToEncode = self.textToEncode.replace(" ", "\u2589")
 
         review_font_name = (
@@ -1155,7 +1157,7 @@ def __post_init__(self):
         max_font_size = GUIConstants.get_top_nav_title_font_size() + 8
         min_font_size = GUIConstants.get_top_nav_title_font_size() - 4
         font_size = max_font_size
-        max_lines = 5
+        max_lines = self.max_lines
         max_chars_per_line = -1
         found_solution = False
         for font_size in range(max_font_size, min_font_size-1, -2):

src/seedsigner/views/scan_views.py

@@ -839,6 +839,18 @@ def _route_decrypted_payload(self, word_bytes: bytes) -> Destination:
                 skip_current_view=True,
             )
 
+        try:
+            decoded_text = word_bytes.decode("utf-8")
+        except UnicodeDecodeError:
+            decoded_text = None
+
+        if decoded_text:
+            return Destination(
+                ScanDecryptedTextView,
+                view_args=dict(text=decoded_text),
+                skip_current_view=True,
+            )
+
         return Destination(ScanInvalidQRTypeView)
 
 
@@ -905,3 +917,26 @@ def run(self):
         )
 
         return Destination(MainMenuView, clear_history=True)
+
+
+class ScanDecryptedTextView(View):
+    def __init__(self, text: str):
+        super().__init__()
+        self.text = text
+
+    def run(self):
+        from seedsigner.gui.screens.tools_screens import ToolsTextQRReviewTextScreen
+
+        DONE = ButtonOption("Done")
+
+        self.run_screen(
+            ToolsTextQRReviewTextScreen,
+            title=_("Decrypted Text"),
+            textToEncode=self.text,
+            max_lines=8,
+            visible_space=False,
+            button_data=[DONE],
+            show_back_button=False,
+        )
+
+        return Destination(MainMenuView, clear_history=True)

tests/test_seedqr_ambiguity.py

@@ -155,3 +155,25 @@ def test_decrypt_route_returns_prompt_for_nested_ambiguous_payload(self, monkeyp
             QRType.SEED__ENCRYPTEDQR,
         ]
         assert destination.view_args["public_data"] == ENCRYPTED_PUBLIC_DATA
+
+    def test_decrypt_route_shows_text_when_payload_is_not_known_qr_type(self, monkeypatch):
+        monkeypatch.setattr(
+            DecodeQR,
+            "analyze_bytedata_payload",
+            staticmethod(
+                lambda segment: PayloadAnalysis(
+                    segment=segment,
+                    candidate_types=[],
+                    public_data=None,
+                    encrypted_qr=None,
+                )
+            ),
+        )
+        monkeypatch.setattr(DecodeQR, "resolve_payload_type", staticmethod(lambda _analysis: None))
+
+        view = scan_views.ScanDecryptEncryptedQRView(encryption_key="outer key", encrypted_data=b"unused")
+        destination = view._route_decrypted_payload(b"UTF-8 TEXT")
+
+        assert isinstance(destination, Destination)
+        assert destination.View_cls == scan_views.ScanDecryptedTextView
+        assert destination.view_args["text"] == "UTF-8 TEXT"