process new metadata format for whisper

Solidity >= 0.5.11 has new whisper metadata format
Metadata: Update the swarm hash to the current specification,
changes bzzr0 to bzzr1 and urls to use bzz-raw://

https://github.com/ethereum/solidity/blob/develop/Changelog.md#0511-2019-08-12

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

@@ -115,6 +115,14 @@ defmodule Explorer.SmartContract.Verifier do
         |> Enum.reverse()
         |> :binary.list_to_bin()
 
+      # Solidity >= 0.5.11 https://github.com/ethereum/solidity/blob/develop/Changelog.md#0511-2019-08-12
+      # Metadata: Update the swarm hash to the current specification, changes bzzr0 to bzzr1 and urls to use bzz-raw://
+      "a265627a7a72315820" <>
+          <<_::binary-size(64)>> <> "64736f6c6343" <> <<_::binary-size(6)>> <> "0032" <> _constructor_arguments ->
+        extracted
+        |> Enum.reverse()
+        |> :binary.list_to_bin()
+
       <<next::binary-size(2)>> <> rest ->
         do_extract_bytecode([next | extracted], rest)
     end

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

@@ -48,6 +48,16 @@ defmodule Explorer.SmartContract.Verifier.ConstructorArguments do
           extract_constructor_arguments(constructor_arguments, passed_constructor_arguments)
         end
 
+      # Solidity >= 0.5.11 https://github.com/ethereum/solidity/blob/develop/Changelog.md#0511-2019-08-12
+      # Metadata: Update the swarm hash to the current specification, changes bzzr0 to bzzr1 and urls to use bzz-raw://
+      "a265627a7a72315820" <>
+          <<_::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
+
       <<>> ->
         passed_constructor_arguments == ""
 

apps/explorer/test/explorer/smart_contract/verifier_test.exs

@@ -56,6 +56,33 @@ defmodule Explorer.SmartContract.VerifierTest do
       assert abi != nil
     end
 
+    test "verifies smart contract with new `whisper` metadata (bzz0 => bzz1) in solidity 0.5.11" do
+      contract_data =
+        "#{File.cwd!()}/test/support/fixture/smart_contract/solidity_5.11_new_whisper_metadata.json"
+        |> File.read!()
+        |> Jason.decode!()
+
+      compiler_version = contract_data["compiler_version"]
+      name = contract_data["name"]
+      optimize = false
+      contract = contract_data["contract"]
+      expected_bytecode = contract_data["bytecode"]
+      evm_version = contract_data["evm_version"]
+
+      contract_address = insert(:contract_address, contract_code: "0x" <> expected_bytecode)
+
+      params = %{
+        "contract_source_code" => contract,
+        "compiler_version" => compiler_version,
+        "evm_version" => evm_version,
+        "name" => name,
+        "optimization" => optimize
+      }
+
+      assert {:ok, %{abi: abi}} = Verifier.evaluate_authenticity(contract_address.hash, params)
+      assert abi != nil
+    end
+
     test "verifies smart contract with constructor arguments", %{
       contract_code_info: contract_code_info
     } do