Implement session module

Signed-off-by: Sean Du <do4suki@gmail.com>

internal/handler/background.go

@@ -1,31 +1,33 @@
 package handler
 
 import (
-	"encoding/json"
 	"honoka-chan/internal/model"
+	"honoka-chan/internal/session"
 	"honoka-chan/internal/tools"
-	"honoka-chan/internal/utils"
-	"net/http"
 
 	"github.com/gin-gonic/gin"
 	"github.com/tidwall/gjson"
 )
 
 func BackgroundSet(ctx *gin.Context) {
+	ss := session.New(ctx)
+	defer ss.Finalize()
+
 	req := gjson.Parse(ctx.PostForm("request_data"))
 	pref := tools.UserPref{
 		BackgroundID: int(req.Get("background_id").Int()),
 	}
-	_, err := UserEng.Table("user_preference_m").Where("user_id = ?", ctx.GetString("userid")).Update(&pref)
-	utils.CheckErr(err)
+
+	_, err := ss.UserEng.Table("user_preference_m").Where("user_id = ?", ctx.GetString("userid")).Update(&pref)
+	if ss.CheckErr(err) {
+		return
+	}
+
 	backgroundResp := model.BackgroundSetResp{
 		ResponseData: []any{},
 		ReleaseInfo:  []any{},
 		StatusCode:   200,
 	}
-	resp, err := json.Marshal(backgroundResp)
-	utils.CheckErr(err)
 
-	ctx.Header("X-Message-Sign", utils.GenXMS(resp))
-	ctx.String(http.StatusOK, string(resp))
+	ss.Respond(backgroundResp)
 }