Revert changes in json driver

pkg/publicshare/manager/json/json.go

@@ -49,6 +49,30 @@ import (
 	"go.opencensus.io/trace"
 )
 
+type janitor struct {
+	m        *manager
+	interval time.Duration
+}
+
+func (j *janitor) run() {
+	ticker := time.NewTicker(j.interval)
+	work := make(chan os.Signal, 1)
+	signal.Notify(work, syscall.SIGHUP, syscall.SIGINT, syscall.SIGQUIT)
+
+	for {
+		select {
+		case <-work:
+			return
+		case <-ticker.C:
+			j.m.cleanupExpiredShares()
+		}
+	}
+}
+
+var j = janitor{
+	interval: time.Minute, // TODO we want this interval configurable
+}
+
 func init() {
 	registry.Register("json", New)
 }
@@ -90,15 +114,15 @@ func New(c map[string]interface{}) (publicshare.Manager, error) {
 		}
 	}
 
-	go m.startJanitorRun()
+	j.m = &m
+	go j.run()
 
 	return &m, nil
 }
 
 type config struct {
 	File                  string `mapstructure:"file"`
 	SharePasswordHashCost int    `mapstructure:"password_hash_cost"`
-	JanitorRunInterval    int    `mapstructure:"janitor_run_interval"`
 }
 
 func (c *config) init() {
@@ -108,34 +132,15 @@ func (c *config) init() {
 	if c.SharePasswordHashCost == 0 {
 		c.SharePasswordHashCost = 11
 	}
-	if c.JanitorRunInterval == 0 {
-		c.JanitorRunInterval = 60
-	}
 }
 
 type manager struct {
 	mutex *sync.Mutex
 	file  string
 
-	marshaler          jsonpb.Marshaler
-	unmarshaler        jsonpb.Unmarshaler
-	passwordHashCost   int
-	janitorRunInterval int
-}
-
-func (m *manager) startJanitorRun() {
-	ticker := time.NewTicker(time.Duration(m.janitorRunInterval) * time.Second)
-	work := make(chan os.Signal, 1)
-	signal.Notify(work, syscall.SIGHUP, syscall.SIGINT, syscall.SIGQUIT)
-
-	for {
-		select {
-		case <-work:
-			return
-		case <-ticker.C:
-			m.cleanupExpiredShares()
-		}
-	}
+	marshaler        jsonpb.Marshaler
+	unmarshaler      jsonpb.Unmarshaler
+	passwordHashCost int
 }
 
 // CreatePublicShare adds a new entry to manager.shares
@@ -168,6 +173,11 @@ func (m *manager) CreatePublicShare(ctx context.Context, u *user.User, rInfo *pr
 		Nanos:   uint32(now % 1000000000),
 	}
 
+	modifiedAt := &typespb.Timestamp{
+		Seconds: uint64(now / 1000000000),
+		Nanos:   uint32(now % 1000000000),
+	}
+
 	s := link.PublicShare{
 		Id:                id,
 		Owner:             rInfo.GetOwner(),
@@ -176,7 +186,7 @@ func (m *manager) CreatePublicShare(ctx context.Context, u *user.User, rInfo *pr
 		Token:             tkn,
 		Permissions:       g.Permissions,
 		Ctime:             createdAt,
-		Mtime:             createdAt,
+		Mtime:             modifiedAt,
 		PasswordProtected: passwordProtected,
 		Expiration:        g.Expiration,
 		DisplayName:       displayName,