Allow brakets for arrays for contract input data, fix decoding for multiple inputs

CHANGELOG.md

@@ -1,11 +1,13 @@
 ## Current
 
 ### Features
+- [#3513](https://github.com/poanetwork/blockscout/pull/3513) - Allow square brackets for an array input data in contracts interaction
 - [#3480](https://github.com/poanetwork/blockscout/pull/3480) - Add support of Autonity client
 - [#3470](https://github.com/poanetwork/blockscout/pull/3470) - Display sum of tokens' USD value at tokens holder's address page
 - [#3462](https://github.com/poanetwork/blockscout/pull/3462) - Display price for bridged tokens
 
 ### Fixes
+- [#3513](https://github.com/poanetwork/blockscout/pull/3513) - Fix input data processing for method call (array type of data)
 - [#3509](https://github.com/poanetwork/blockscout/pull/3509) - Fix QR code tooltip appearance in mobile view
 - [#3507](https://github.com/poanetwork/blockscout/pull/3507), [#3510](https://github.com/poanetwork/blockscout/pull/3510) - Fix left margin of balance card in mobile view
 - [#3506](https://github.com/poanetwork/blockscout/pull/3506) - Fix token trasfer's tile styles: prevent overlapping of long names

apps/block_scout_web/assets/js/lib/smart_contract/functions.js

@@ -135,6 +135,9 @@ function callMethod (isWalletEnabled, $functionInputs, explorerChainId, $form, f
     let preparedVal
     if (isNonSpaceInputType(inputType)) { preparedVal = val.replace(/\s/g, '') } else { preparedVal = val }
     if (isArrayInputType(inputType)) {
+      if (preparedVal.startsWith('[') && preparedVal.endsWith(']')) {
+        preparedVal = preparedVal.substring(1, preparedVal.length - 1)
+      }
       return preparedVal.split(',')
     } else { return preparedVal }
   })

apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/contract.ex

@@ -78,10 +78,11 @@ defmodule EthereumJSONRPC.Contract do
   end
 
   defp format_args(function, args) do
+    types = function.types
+
     args
     |> Enum.with_index()
     |> Enum.map(fn {arg, index} ->
-      types = function.types
       type = Enum.at(types, index)
 
       convert_string_to_array(type, arg)
@@ -97,26 +98,54 @@ defmodule EthereumJSONRPC.Contract do
         convert_int_string_to_array(arg)
 
       {:array, _} ->
-        if arg && arg !== "" do
-          String.split(arg, ",")
-        else
-          []
-        end
+        convert_string_to_array(arg)
 
       _ ->
         arg
     end
   end
 
-  defp convert_int_string_to_array(arg) do
-    if arg && arg !== "" do
+  defp convert_int_string_to_array(arg) when is_nil(arg), do: true
+
+  defp convert_int_string_to_array(arg) when not is_nil(arg) do
+    cond do
+      String.starts_with?(arg, "[") && String.ends_with?(arg, "]") ->
+        arg
+        |> String.trim_leading("[")
+        |> String.trim_trailing("]")
+        |> convert_int_string_to_array_inner()
+
+      arg !== "" ->
+        convert_int_string_to_array_inner(arg)
+
+      true ->
+        []
+    end
+  end
+
+  defp convert_int_string_to_array_inner(arg) do
     arg
     |> String.split(",")
     |> Enum.map(fn el ->
       {int, _} = Integer.parse(el)
       int
     end)
-    else
+  end
+
+  defp convert_string_to_array(arg) when is_nil(arg), do: true
+
+  defp convert_string_to_array(arg) when not is_nil(arg) do
+    cond do
+      String.starts_with?(arg, "[") && String.ends_with?(arg, "]") ->
+        arg
+        |> String.trim_leading("[")
+        |> String.trim_trailing("]")
+        |> String.split(",")
+
+      arg !== "" ->
+        String.split(arg, ",")
+
+      true ->
         []
     end
   end
@@ -151,11 +180,13 @@ defmodule EthereumJSONRPC.Contract do
         block_number -> integer_to_quantity(block_number)
       end
 
-    request(%{
+    full_params = %{
       id: id,
       method: "eth_call",
       params: [%{to: contract_address, data: data, from: from}, block]
-    })
+    }
+
+    request(full_params)
   end
 
   def eth_get_storage_at_request(contract_address, storage_pointer, block_number, json_rpc_named_arguments) do

apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/encoder.ex

@@ -13,9 +13,11 @@ defmodule EthereumJSONRPC.Encoder do
   """
   @spec encode_function_call(%ABI.FunctionSelector{}, [term()]) :: String.t()
   def encode_function_call(function_selector, args) do
+    parsed_args = parse_args(args)
+
     encoded_args =
       function_selector
-      |> ABI.encode(parse_args(args))
+      |> ABI.encode(parsed_args)
       |> Base.encode16(case: :lower)
 
     "0x" <> encoded_args
@@ -28,7 +30,15 @@ defmodule EthereumJSONRPC.Encoder do
         Base.decode16!(hexadecimal_digits, case: :mixed)
 
       item ->
+        if is_list(item) do
           item
+          |> Enum.map(fn el ->
+            <<"0x", hexadecimal_digits::binary>> = el
+            Base.decode16!(hexadecimal_digits, case: :mixed)
+          end)
+        else
+          item
+        end
     end)
   end
 

apps/explorer/lib/explorer/smart_contract/reader.ex

@@ -259,18 +259,18 @@ defmodule Explorer.SmartContract.Reader do
     |> Enum.with_index()
     |> Enum.all?(fn {target_type, index} ->
       type_to_compare = Map.get(Enum.at(Map.get(target_method, "inputs"), index), "type")
-      target_type_formatted = format_input_type(target_type)
+      target_type_formatted = format_type(target_type)
       target_type_formatted == type_to_compare
     end)
   end
 
-  defp format_input_type(input_type) do
+  defp format_type(input_type) do
     case input_type do
       {:array, type, array_size} ->
-        format_input_type(type) <> "[" <> Integer.to_string(array_size) <> "]"
+        format_type(type) <> "[" <> Integer.to_string(array_size) <> "]"
 
       {:array, type} ->
-        format_input_type(type) <> "[]"
+        format_type(type) <> "[]"
 
       {:tuple, tuple} ->
         format_tuple_type(tuple)
@@ -288,9 +288,9 @@ defmodule Explorer.SmartContract.Reader do
       tuple
       |> Enum.reduce(nil, fn tuple_item, acc ->
         if acc do
-          acc <> "," <> format_input_type(tuple_item)
+          acc <> "," <> format_type(tuple_item)
         else
-          format_input_type(tuple_item)
+          format_type(tuple_item)
         end
       end)
 
@@ -378,6 +378,15 @@ defmodule Explorer.SmartContract.Reader do
     returns
     |> Enum.map(fn output ->
       case output do
+        {:array, type, array_size} ->
+          %{"type" => format_type(type) <> "[" <> Integer.to_string(array_size) <> "]"}
+
+        {:array, type} ->
+          %{"type" => format_type(type) <> "[]"}
+
+        {:tuple, tuple} ->
+          %{"type" => format_tuple_type(tuple)}
+
         {type, size} ->
           full_type = Atom.to_string(type) <> Integer.to_string(size)
           %{"type" => full_type}