Add SPV request body json protocol. (#137)

Co-authored-by: Edwin Guayacan <80716239+EdwinGuayacan@users.noreply.github.com>

lib/types/spv_request_body.ex

@@ -3,6 +3,7 @@ defmodule Kadena.Types.SPVRequestBody do
   `SPVRequestBody` struct definition.
   """
 
+  alias Kadena.Chainweb.Pact.JSONPayload
   alias Kadena.Types.{Base64Url, ChainID}
 
   @behaviour Kadena.Types.Spec
@@ -48,4 +49,29 @@ defmodule Kadena.Types.SPVRequestBody do
       {:error, reasons} -> {:error, [target_chain_id: :invalid] ++ reasons}
     end
   end
+
+  defimpl JSONPayload do
+    alias Kadena.Types.SPVRequestBody
+    alias Kadena.Utils.MapCase
+
+    @type request_key :: Base64Url.t()
+    @type target_chain_id :: ChainID.t()
+    @type value :: String.t()
+
+    @impl true
+    def parse(%SPVRequestBody{request_key: request_key, target_chain_id: chain_id}) do
+      request_key = extract_key(request_key)
+      chain_id = extract_chain_id(chain_id)
+
+      %{request_key: request_key, target_chain_id: chain_id}
+      |> MapCase.to_camel!()
+      |> Jason.encode!()
+    end
+
+    @spec extract_key(request_key()) :: value()
+    defp extract_key(%Base64Url{url: url}), do: url
+
+    @spec extract_chain_id(target_chain_id()) :: value()
+    defp extract_chain_id(%ChainID{id: id}), do: id
+  end
 end

test/types/spv_request_body_test.exs

@@ -5,6 +5,7 @@ defmodule Kadena.Types.SPVRequestBodyTest do
 
   use ExUnit.Case
 
+  alias Kadena.Chainweb.Pact.JSONPayload
   alias Kadena.Types.{Base64Url, ChainID, SPVRequestBody}
 
   describe "new/1" do
@@ -42,4 +43,25 @@ defmodule Kadena.Types.SPVRequestBodyTest do
       {:error, [spv_request_body: :not_a_list]} = SPVRequestBody.new("invalid_param")
     end
   end
+
+  describe "JSONPayload.parse/1" do
+    setup do
+      %{
+        json_result:
+          "{\"requestKey\":\"7af34f24d55d2fcf5de6fccfeeb837698ebff4598303237c64348a47806c8646\",\"targetChainId\":\"1\"}"
+      }
+    end
+
+    test "with a valid SPVRequestBody", %{
+      json_result: json_result
+    } do
+      spv_request_body =
+        SPVRequestBody.new(
+          request_key: "7af34f24d55d2fcf5de6fccfeeb837698ebff4598303237c64348a47806c8646",
+          target_chain_id: "1"
+        )
+
+      ^json_result = JSONPayload.parse(spv_request_body)
+    end
+  end
 end