fix nested constructor arguments

apps/explorer/lib/explorer/smart_contract/verifier/constructor_arguments.ex

@@ -6,30 +6,37 @@ defmodule Explorer.SmartContract.Verifier.ConstructorArguments do
   alias Explorer.Chain
 
   def verify(address_hash, arguments_data) do
-    arguments_data = String.replace(arguments_data, "0x", "")
+    arguments_data =
+      arguments_data |> String.trim_trailing() |> String.trim_leading() |> String.replace("0x", "") |> IO.inspect()
 
     address_hash
     |> Chain.contract_creation_input_data()
     |> String.replace("0x", "")
-    |> extract_constructor_arguments()
-    |> Kernel.==(arguments_data)
+    |> extract_constructor_arguments(arguments_data)
   end
 
-  defp extract_constructor_arguments(<<>>), do: ""
+  defp extract_constructor_arguments(code, passed_constructor_arguments) do
+    case code do
+      "a165627a7a72305820" <> <<_::binary-size(64)>> <> "0029" <> constructor_arguments ->
+        if passed_constructor_arguments == constructor_arguments do
+          true
+        else
+          extract_constructor_arguments(constructor_arguments, passed_constructor_arguments)
+        end
 
-  defp extract_constructor_arguments("a165627a7a72305820" <> <<_::binary-size(64)>> <> "0029" <> constructor_arguments) do
-    constructor_arguments
-  end
+      "a265627a7a72305820" <>
+          <<_::binary-size(64)>> <> "64736f6c6343" <> <<_::binary-size(6)>> <> "0032" <> constructor_arguments ->
+        if passed_constructor_arguments == constructor_arguments do
+          true
+        else
+          extract_constructor_arguments(constructor_arguments, passed_constructor_arguments)
+        end
 
-  # Solidity >= 0.5.9; https://github.com/ethereum/solidity/blob/aa4ee3a1559ebc0354926af962efb3fcc7dc15bd/docs/metadata.rst
-  defp extract_constructor_arguments(
-         "a265627a7a72305820" <>
-           <<_::binary-size(64)>> <> "64736f6c6343" <> <<_::binary-size(6)>> <> "0032" <> constructor_arguments
-       ) do
-    constructor_arguments
-  end
+      <<>> ->
+        false
 
-  defp extract_constructor_arguments(<<_::binary-size(2)>> <> rest) do
-    extract_constructor_arguments(rest)
+      <<_::binary-size(2)>> <> rest ->
+        extract_constructor_arguments(rest, passed_constructor_arguments)
+    end
   end
 end

apps/explorer/test/explorer/smart_contract/verifier/constructor_arguments_test.exs

@@ -24,4 +24,24 @@ defmodule Explorer.SmartContract.Verifier.ConstructorArgumentsTest do
 
     assert ConstructorArguments.verify(address.hash, constructor_arguments)
   end
+
+  test "verifies with multiple nested constructor arguments" do
+    address = insert(:address)
+
+    constructor_arguments =
+      "000000000000000000000000314159265dd8dbb310642f98f50c066173c1259b93cdeb708b7545dc668eb9280176169d1c33cfd8ed6f04690a0bcc88a93fc4ae00000000000000000000000000000000000000000000000000000000590b09b0"
+
+    input =
+      "a165627a7a72305820fbfa6f8a2024760ef0e0eb29a332c9a820526e92f8b4fbcce6f00c7643234b1400297b6c4b278d165a6b33958f8ea5dfb00c8c9d4d0acf1985bef5d10786898bc3e7a165627a7a723058203c2db82e7c80cd1e371fe349b03d49b812c324ba4a3fcd063b7bc2662353c5de0029000000000000000000000000314159265dd8dbb310642f98f50c066173c1259b93cdeb708b7545dc668eb9280176169d1c33cfd8ed6f04690a0bcc88a93fc4ae00000000000000000000000000000000000000000000000000000000590b09b0"
+
+    input_data = %Data{
+      bytes: Base.decode16!(input, case: :lower)
+    }
+
+    :transaction
+    |> insert(created_contract_address_hash: address.hash, input: input_data)
+    |> with_block()
+
+    assert ConstructorArguments.verify(address.hash, constructor_arguments)
+  end
 end