feat: add network account status (nonce, balance)

cmd/service/api.go

@@ -50,6 +50,7 @@ func initApiServer(custodialContainer *custodial.Custodial) *echo.Echo {
 	apiRoute := server.Group("/api", systemGlobalLock)
 
 	apiRoute.POST("/account/create", api.HandleAccountCreate)
+	apiRoute.GET("/account/status/:address", api.HandleNetworkAccountStatus)
 	apiRoute.POST("/sign/transfer", api.HandleSignTransfer)
 	apiRoute.GET("/track/:trackingId", api.HandleTrackTx)
 

internal/api/network.go

@@ -0,0 +1,51 @@
+package api
+
+import (
+	"fmt"
+	"math/big"
+	"net/http"
+
+	"github.com/grassrootseconomics/cic-custodial/internal/custodial"
+	"github.com/grassrootseconomics/w3-celo-patch"
+	"github.com/grassrootseconomics/w3-celo-patch/module/eth"
+	"github.com/labstack/echo/v4"
+)
+
+func HandleNetworkAccountStatus(c echo.Context) error {
+	var (
+		cu                   = c.Get("cu").(*custodial.Custodial)
+		accountStatusRequest struct {
+			Address string `param:"address" validate:"required,eth_checksum"`
+		}
+		networkBalance big.Int
+		networkNonce   uint64
+	)
+
+	if err := c.Bind(&accountStatusRequest); err != nil {
+		return NewBadRequestError(ErrInvalidJSON)
+	}
+
+	if err := c.Validate(accountStatusRequest); err != nil {
+		return err
+	}
+
+	if err := cu.CeloProvider.Client.CallCtx(
+		c.Request().Context(),
+		eth.Nonce(w3.A(accountStatusRequest.Address), nil).Returns(&networkNonce),
+		eth.Balance(w3.A(accountStatusRequest.Address), nil).Returns(&networkBalance),
+	); err != nil {
+		return err
+	}
+
+	if networkNonce > 0 {
+		networkNonce--
+	}
+
+	return c.JSON(http.StatusOK, OkResp{
+		Ok: true,
+		Result: H{
+			"balance": fmt.Sprintf("%s CELO", w3.FromWei(&networkBalance, 18)),
+			"nonce":   networkNonce,
+		},
+	})
+}