fixup! feat: Support Ethereum EIP-712 Sign Typed Data

Add test for nested arrays.
Not supported in Trezor Model T as of 2.4.3,
but might be added in the future.

Author: aloisklink

src/js/core/methods/helpers/__fixtures__/ethereumSignTypedData.js

@@ -19,6 +19,17 @@ export const parseArrayType = [
             arraySize: null,
         },
     },
+    {
+        // Decode last [] first
+        // Can't find an official source, but this is what Metamask's signTypedData_v4 does:
+        // https://github.com/MetaMask/eth-sig-util/blob/5f2259463990050606cd58b43e64e4bffcb715f4/src/sign-typed-data.ts#L202-L211
+        description: 'should parse nested arrays',
+        input: 'int32[5][12]',
+        output: {
+            entryTypeName: 'int32[5]',
+            arraySize: 12,
+        },
+    },
     {
         description: 'should throw error for non-array type',
         input: 'bytes',
@@ -121,6 +132,26 @@ export const getFieldType = [
             },
         },
     },
+    {
+        // Unsupported in Trezor firmware as of v2.4.3
+        description: 'should parse nested arrays',
+        input: {
+            typeName: 'int32[5][12]',
+            types: {},
+        },
+        output: {
+            data_type: Enum_EthereumDataType.ARRAY,
+            size: 12,
+            entry_type: {
+                data_type: Enum_EthereumDataType.ARRAY,
+                size: 5,
+                entry_type: {
+                    data_type: Enum_EthereumDataType.INT,
+                    size: 4,
+                },
+            },
+        },
+    },
     {
         description: `should parse Struct types`,
         input: {

src/js/core/methods/helpers/ethereumSignTypedData.js

@@ -146,9 +146,6 @@ export function getFieldType(
     if (arrayMatch) {
         const [_, arrayItemTypeName, arraySize] = arrayMatch;
         const entryType = getFieldType(arrayItemTypeName, types);
-        if (entryType.data_type === Enum_EthereumDataType.ARRAY) {
-            throw ERRORS.TypedError('Method_InvalidParameter', 'Nested arrays are not supported');
-        }
         return {
             data_type: Enum_EthereumDataType.ARRAY,
             size: parseInt(arraySize, 10) || undefined,