[MM-8497] Ability to set Do Not Disturb for a specified period of time (#17680)

* Revert "Revert "[MM-8497] Ability to set Do Not Disturb for a specified period of time (#16067)" (#17657)"

This reverts commit ff383990f8.

* add debug log for recurring function

* add feature flag for dnd timed status

* refactoring changes

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/status.go

@@ -282,6 +282,28 @@ func (a *App) SetStatusAwayIfNeeded(userID string, manual bool) {
 	a.SaveAndBroadcastStatus(status)
 }
 
+// SetStatusDoNotDisturbTimed takes endtime in unix epoch format in UTC
+// and sets status of given userId to dnd which will be restored back after endtime
+func (a *App) SetStatusDoNotDisturbTimed(userId string, endtime int64) {
+	if !*a.Config().ServiceSettings.EnableUserStatuses {
+		return
+	}
+
+	status, err := a.GetStatus(userId)
+
+	if err != nil {
+		status = &model.Status{UserId: userId, Status: model.STATUS_OFFLINE, Manual: false, LastActivityAt: 0, ActiveChannel: ""}
+	}
+
+	status.PrevStatus = status.Status
+	status.Status = model.STATUS_DND
+	status.Manual = true
+
+	status.DNDEndTime = endtime
+
+	a.SaveAndBroadcastStatus(status)
+}
+
 func (a *App) SetStatusDoNotDisturb(userID string) {
 	if !*a.Config().ServiceSettings.EnableUserStatuses {
 		return
@@ -365,6 +387,21 @@ func (a *App) IsUserAway(lastActivityAt int64) bool {
 	return model.GetMillis()-lastActivityAt >= *a.Config().TeamSettings.UserStatusAwayTimeout*1000
 }
 
+// UpdateDNDStatusOfUsers is a recurring task which is started when server starts
+// which unsets dnd status of users if needed and saves and broadcasts it
+func (a *App) UpdateDNDStatusOfUsers() {
+	mlog.Debug("UpdateDNDStatusOfUsers: scheduled run started")
+	statuses, err := a.UpdateExpiredDNDStatuses()
+	if err != nil {
+		mlog.Warn("Failed to fetch dnd statues from store", mlog.String("err", err.Error()))
+		return
+	}
+	for i := range statuses {
+		a.AddStatusCache(statuses[i])
+		a.BroadcastStatus(statuses[i])
+	}
+}
+
 func (a *App) SetCustomStatus(userID string, cs *model.CustomStatus) *model.AppError {
 	user, err := a.GetUser(userID)
 	if err != nil {