diff --git a/core/api.go b/core/api.go
index 179c51e..a5ea1d2 100644
--- a/core/api.go
+++ b/core/api.go
@@ -18,7 +18,7 @@ import (
 	"time"
 	"unsafe"
 
-	common "repositories.action2quare.com/ayo/gocommon"
+	"repositories.action2quare.com/ayo/gocommon"
 	"repositories.action2quare.com/ayo/gocommon/logger"
 
 	"go.mongodb.org/mongo-driver/bson"
@@ -66,9 +66,9 @@ func (fd *FileDocumentDesc) Save() error {
 	if fd.Extract {
 		switch path.Ext(destFile) {
 		case ".zip":
-			err = common.Unzip(destFile)
+			err = gocommon.Unzip(destFile)
 		case ".tar":
-			err = common.Untar(destFile)
+			err = gocommon.Untar(destFile)
 		}
 	}
 	return err
@@ -435,9 +435,9 @@ func (mg *Maingate) api(w http.ResponseWriter, r *http.Request) {
 	ptr := atomic.LoadPointer(&mg.admins)
 	adminsptr := (*globalAdmins)(ptr)
 
-	if adminsptr.modtime != common.ConfigModTime() {
+	if adminsptr.modtime != gocommon.ConfigModTime() {
 		var config globalAdmins
-		if err := common.LoadConfig(&config); err == nil {
+		if err := gocommon.LoadConfig(&config); err == nil {
 			config.parse()
 			adminsptr = &config
 			atomic.StorePointer(&mg.admins, unsafe.Pointer(adminsptr))
diff --git a/core/service.go b/core/service.go
index 3127cbb..56b0d46 100644
--- a/core/service.go
+++ b/core/service.go
@@ -2,20 +2,18 @@ package core
 
 import (
 	"context"
-	"crypto/md5"
 	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
 	"net/http"
-	"path"
 	"strings"
 	"sync/atomic"
 	"time"
 	"unsafe"
 
-	common "repositories.action2quare.com/ayo/gocommon"
+	"repositories.action2quare.com/ayo/gocommon"
 	"repositories.action2quare.com/ayo/gocommon/logger"
 
 	"go.mongodb.org/mongo-driver/bson"
@@ -139,9 +137,9 @@ type serviceDescription struct {
 	ServerApiTokens           []primitive.ObjectID `bson:"api_tokens" json:"api_tokens"`
 	Admins                    []string             `bson:"admins" json:"admins"`
 
-	auths                 *common.AuthCollection
+	auths                 *gocommon.AuthCollection
 	wl                    *whitelist
-	mongoClient           common.MongoClient
+	mongoClient           gocommon.MongoClient
 	sessionTTL            time.Duration
 	MaximumNumLinkAccount int64
 
@@ -238,11 +236,16 @@ func (sh *serviceDescription) prepare(mg *Maingate) error {
 				} else if strings.HasPrefix(div.Maintenance.Notice, "http") {
 					div.Maintenance.link = div.Maintenance.Notice
 				} else {
-					hasher := md5.New()
-					hasher.Write(sh.Id[:])
-					subfolder := hex.EncodeToString(hasher.Sum(nil))[:8]
+					var fd FileDocumentDesc
+					if err := sh.mongoClient.FindOneAs(CollectionFile, bson.M{
+						"key": div.Maintenance.Notice,
+					}, &fd, options.FindOne().SetProjection(bson.M{"link": 1})); err != nil {
+						logger.Println(err)
+						return err
+					}
 
-					div.Maintenance.link = path.Join("static", subfolder, div.Maintenance.Notice)
+					div.Maintenance.link = fd.Link
+					logger.Println("div.Maintenance.link :", fd.Link)
 				}
 			}
 		} else {
@@ -687,7 +690,7 @@ func (sh *serviceDescription) authorize(w http.ResponseWriter, r *http.Request)
 
 		newsession := primitive.NewObjectID()
 		expired := primitive.NewDateTimeFromTime(time.Now().UTC().Add(sh.sessionTTL))
-		newauth := common.Authinfo{
+		newauth := gocommon.Authinfo{
 			Accid:       accid,
 			ServiceCode: sh.ServiceCode,
 			Platform:    authtype,
diff --git a/core/watch.go b/core/watch.go
index 42b23cc..3e6c30e 100644
--- a/core/watch.go
+++ b/core/watch.go
@@ -10,7 +10,7 @@ import (
 	"time"
 	"unsafe"
 
-	common "repositories.action2quare.com/ayo/gocommon"
+	"repositories.action2quare.com/ayo/gocommon"
 	"repositories.action2quare.com/ayo/gocommon/logger"
 
 	"go.mongodb.org/mongo-driver/bson"
@@ -24,7 +24,7 @@ type authPipelineDocument struct {
 	DocumentKey   struct {
 		Id primitive.ObjectID `bson:"_id"`
 	} `bson:"documentKey"`
-	Authinfo *common.Authinfo `bson:"fullDocument"`
+	Authinfo *gocommon.Authinfo `bson:"fullDocument"`
 }
 
 type servicePipelineDocument struct {
@@ -289,7 +289,7 @@ func (mg *Maingate) watchServiceCollection(parentctx context.Context, serveMux *
 						logger.Println("service is on the board! :", data.Service)
 						atomic.StorePointer(&mg.serviceptr, unsafe.Pointer(data.Service))
 						if !already {
-							serveMux.Handle(common.MakeHttpHandlerPattern(prefix, data.Service.ServiceCode, "/"), mg.service())
+							serveMux.Handle(gocommon.MakeHttpHandlerPattern(prefix, data.Service.ServiceCode, "/"), mg.service())
 						}
 					}
 
@@ -321,7 +321,7 @@ func (mg *Maingate) watchServiceCollection(parentctx context.Context, serveMux *
 	}
 }
 
-func watchAuthCollection(parentctx context.Context, ac *common.AuthCollection, mongoClient common.MongoClient) {
+func watchAuthCollection(parentctx context.Context, ac *gocommon.AuthCollection, mongoClient gocommon.MongoClient) {
 	defer func() {
 		s := recover()
 		if s != nil {
diff --git a/main.go b/main.go
index 195cf96..7de2944 100644
--- a/main.go
+++ b/main.go
@@ -6,7 +6,7 @@ import (
 	"net/http"
 	"time"
 
-	common "repositories.action2quare.com/ayo/gocommon"
+	"repositories.action2quare.com/ayo/gocommon"
 	"repositories.action2quare.com/ayo/gocommon/flagx"
 	"repositories.action2quare.com/ayo/gocommon/logger"
 	"repositories.action2quare.com/ayo/maingate/core"
@@ -36,7 +36,7 @@ func main() {
 		panic(err)
 	}
 
-	server := common.NewHTTPServer(serveMux)
+	server := gocommon.NewHTTPServer(serveMux)
 	logger.Println("maingate is started")
 	if err := server.Start(); err != nil {
 		logger.Error("maingate is stopped with error :", err)