fix(cardano): stop trimming long messages

[no changelog]

Author: ibz

common/tests/fixtures/cardano/sign_message.json

@@ -105,6 +105,21 @@
         "address": "d9553a4de9c7ad8532abdb1d0a7f425b8007d25c9f1edcf0b5f5c3ba",
         "pub_key": "67e3d14e1e0db2a6ff68832994451f63d3e92a4ee85c3681d72634ccfe889f2c"
       }
+    },
+    {
+      "description": "Long payload",
+      "parameters": {
+        "signing_path": "m/1852'/1815'/4'/0/0",
+        "network_id": 1,
+        "protocol_magic": 764824073,
+        "payload": "aaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff00011100011aaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbddd1bbbdddaafffaaafff000111000111bbbdddaaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff00011100011aaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbdddaaafffaaafff000111000111bbbddd1bbbdddaafffaaafff000111000111bbbdddee",
+        "prefer_hex_display": true
+      },
+      "result": {
+        "signature": "6d1e9bf2f704413b1a99340bb88f27a4a74f00fe7ed891b814a9a0167b6482b0b92982a5eb0be513fe5e432c4a79550d615222cf9ffcf70f42f8e600bf302c0f",
+        "address": "d9553a4de9c7ad8532abdb1d0a7f425b8007d25c9f1edcf0b5f5c3ba",
+        "pub_key": "67e3d14e1e0db2a6ff68832994451f63d3e92a4ee85c3681d72634ccfe889f2c"
+      }
     }
   ]
 }

core/src/apps/cardano/layout.py

@@ -329,8 +329,6 @@ async def confirm_message_payload(
 ) -> None:
     props: list[PropertyType]
 
-    max_displayed_bytes = MAX_CHUNK_SIZE
-
     if not payload:
         assert payload_size == 0
         props = _get_data_chunk_props(
@@ -343,15 +341,15 @@ async def confirm_message_payload(
             title=TR.cardano__message_text,
             first_chunk=payload,
             data_size=payload_size,
-            max_displayed_size=max_displayed_bytes,
+            max_displayed_size=None,
             decoder=lambda chunk: chunk.decode("ascii"),
         )
     else:
         props = _get_data_chunk_props(
             title=TR.cardano__message_hex,
             first_chunk=payload,
             data_size=payload_size,
-            max_displayed_size=max_displayed_bytes,
+            max_displayed_size=None,
         )
 
     await confirm_properties(
@@ -366,10 +364,14 @@ def _get_data_chunk_props(
     title: str,
     first_chunk: bytes,
     data_size: int,
-    max_displayed_size: int = _DEFAULT_MAX_DISPLAYED_CHUNK_SIZE,
+    max_displayed_size: int | None = _DEFAULT_MAX_DISPLAYED_CHUNK_SIZE,
     decoder: Callable[[bytes], bytes | str] | None = None,
 ) -> list[PropertyType]:
-    displayed_bytes = first_chunk[:max_displayed_size]
+    displayed_bytes = (
+        first_chunk[:max_displayed_size]
+        if max_displayed_size is not None
+        else first_chunk
+    )
     bytes_optional_plural = "byte" if data_size == 1 else "bytes"
     props: list[PropertyType] = [
         (
@@ -378,7 +380,7 @@ def _get_data_chunk_props(
             True,
         )
     ]
-    if data_size > max_displayed_size:
+    if max_displayed_size is not None and data_size > max_displayed_size:
         props.append(("...", None, None))
 
     return props