Implement session module

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

internal/session/session.go

@@ -0,0 +1,65 @@
+package session
+
+import (
+	"encoding/json"
+	"honoka-chan/internal/utils"
+	"honoka-chan/pkg/db"
+
+	"github.com/gin-gonic/gin"
+	"xorm.io/xorm"
+)
+
+type Session struct {
+	Ctx     *gin.Context
+	MainEng *xorm.Session
+	UserEng *xorm.Session
+}
+
+func New(ctx *gin.Context) *Session {
+	ss := &Session{
+		Ctx: ctx,
+	}
+
+	ss.MainEng = db.MainEng.NewSession()
+
+	ss.UserEng = db.UserEng.NewSession()
+	ss.UserEng.Begin()
+
+	return ss
+}
+
+func (ss *Session) Finalize() {
+	ss.MainEng.Close()
+
+	ss.UserEng.Commit()
+	ss.UserEng.Close()
+}
+
+func (ss *Session) Abort(err error) {
+	ss.MainEng.Close()
+
+	ss.UserEng.Rollback()
+	ss.UserEng.Close()
+
+	ss.Ctx.JSON(500, gin.H{"error": err.Error()})
+	ss.Ctx.Abort()
+}
+
+func (ss *Session) CheckErr(err error) bool {
+	if err != nil {
+		ss.Abort(err)
+		return true
+	}
+	return false
+}
+
+func (ss *Session) Respond(resp any) {
+	data, err := json.Marshal(resp)
+	if err != nil {
+		ss.Abort(err)
+		return
+	}
+
+	ss.Ctx.Header("X-Message-Sign", utils.GenXMS(data))
+	ss.Ctx.String(200, string(data))
+}