ft: add caller mw

pkg/server/mw.go

@@ -0,0 +1,33 @@
+package server
+
+import (
+	"context"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/labstack/echo/v4"
+)
+
+const (
+	_headerCaller = "X-Caller"
+)
+
+type Caller struct{}
+
+func SetResponseHeaderMw(next echo.HandlerFunc) echo.HandlerFunc {
+	return func(c echo.Context) error {
+		c.Response().Header().Set("Content-Type", "application/json")
+		return next(c)
+	}
+}
+
+func SetCallerContextMw(next echo.HandlerFunc) echo.HandlerFunc {
+	return func(c echo.Context) error {
+		caller := c.Request().Header.Get(_headerCaller)
+		if common.IsHexAddress(caller) {
+			ctx := context.WithValue(c.Request().Context(), Caller{}, common.HexToAddress(caller))
+			c.SetRequest(c.Request().WithContext(ctx))
+		}
+
+		return next(c)
+	}
+}