feat: add custodial registration proxy handler

internal/handler/custodial_registration.go

@@ -0,0 +1,66 @@
+package handler
+
+import (
+	"context"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/grassrootseconomics/eth-tracker/pkg/event"
+	"github.com/grassrootseconomics/eth-tracker/pkg/router"
+	"github.com/lmittmann/w3"
+)
+
+const custodialRegistrationEventName = "CUSTODIAL_REGISTRATION"
+
+var (
+	custodialRegistrationEvent = w3.MustNewEvent("NewRegistration(address indexed subject)")
+	custodialRegistrationSig   = w3.MustNewFunc("register(address)", "")
+)
+
+func HandleCustodialRegistrationLog() router.LogHandlerFunc {
+	return func(ctx context.Context, lp router.LogPayload, c router.Callback) error {
+		var account common.Address
+
+		if err := custodialRegistrationEvent.DecodeArgs(lp.Log, &account); err != nil {
+			return err
+		}
+
+		custodialRegistrationEvent := event.Event{
+			Index:           lp.Log.Index,
+			Block:           lp.Log.BlockNumber,
+			ContractAddress: lp.Log.Address.Hex(),
+			Success:         true,
+			Timestamp:       lp.Timestamp,
+			TxHash:          lp.Log.TxHash.Hex(),
+			TxType:          custodialRegistrationEventName,
+			Payload: map[string]any{
+				"account": account.Hex(),
+			},
+		}
+
+		return c(ctx, custodialRegistrationEvent)
+	}
+}
+
+func HandleCustodialRegistrationInputData() router.InputDataHandlerFunc {
+	return func(ctx context.Context, idp router.InputDataPayload, c router.Callback) error {
+		var account common.Address
+
+		if err := custodialRegistrationSig.DecodeArgs(w3.B(idp.InputData), &account); err != nil {
+			return err
+		}
+
+		custodialRegistrationEvent := event.Event{
+			Block:           idp.Block,
+			ContractAddress: idp.ContractAddress,
+			Success:         false,
+			Timestamp:       idp.Timestamp,
+			TxHash:          idp.TxHash,
+			TxType:          custodialRegistrationEventName,
+			Payload: map[string]any{
+				"account": account.Hex(),
+			},
+		}
+
+		return c(ctx, custodialRegistrationEvent)
+	}
+}