refactor(backend): optimize code organization structure

backend/internal/api/middleware/error.go

@@ -0,0 +1,63 @@
+package middleware
+
+import (
+	"bytes"
+	"encoding/json"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"github.com/nicksnyder/go-i18n/v2/i18n"
+
+	"github.com/veops/oneterm/internal/api/controller"
+	myi18n "github.com/veops/oneterm/internal/i18n"
+)
+
+type bodyWriter struct {
+	gin.ResponseWriter
+	body *bytes.Buffer
+}
+
+func (w bodyWriter) Write(b []byte) (int, error) {
+	return w.body.Write(b)
+}
+
+func Error2RespMiddleware() gin.HandlerFunc {
+	return func(ctx *gin.Context) {
+		if strings.Contains(ctx.Request.URL.String(), "session/replay") {
+			ctx.Next()
+			return
+		}
+
+		wb := &bodyWriter{
+			body:           &bytes.Buffer{},
+			ResponseWriter: ctx.Writer,
+		}
+		ctx.Writer = wb
+
+		ctx.Next()
+
+		obj := make(map[string]any)
+		json.Unmarshal(wb.body.Bytes(), &obj)
+		if len(ctx.Errors) > 0 {
+			if v, ok := obj["code"]; !ok || v == 0 {
+				obj["code"] = ctx.Writer.Status()
+			}
+
+			if v, ok := obj["message"]; !ok || v == "" {
+				e := ctx.Errors.Last().Err
+				obj["message"] = e.Error()
+
+				ae, ok := e.(*controller.ApiError)
+				if ok {
+					lang := ctx.PostForm("lang")
+					accept := ctx.GetHeader("Accept-Language")
+					localizer := i18n.NewLocalizer(myi18n.Bundle, lang, accept)
+					obj["message"] = ae.Message(localizer)
+
+				}
+			}
+		}
+		bs, _ := json.Marshal(obj)
+		wb.ResponseWriter.Write(bs)
+	}
+}