Moved IsUserAdmin from Update, added Chat method

dispatcher.go

@@ -30,7 +30,7 @@ func (d *Dispatcher) HandleCommand(command *Command, handler UpdateHandler) *Dis
 		if !strings.HasPrefix(u.Text(), command.String()) {
 			return false, nil
 		}
-		if command.IsAdminOnly && !u.IsUserAdmin() && u.ChatID() < 0 {
+		if command.IsAdminOnly && !IsUserAdmin(u) && u.ChatID() < 0 {
 			return false, nil
 		}
 		err := handler(u)

update.go

@@ -33,6 +33,26 @@ func (u *Update) Upd() *echotron.Update {
 	return (*echotron.Update)(&u.U)
 }
 
+func (u *Update) Chat() echotron.Chat {
+	if u.IsMessage() {
+		return u.Message.Chat
+	}
+	if u.IsCallback() {
+		return u.CallbackQuery.Message.Chat
+	}
+	if u.EditedMessage != nil {
+		return u.EditedMessage.Chat
+	}
+	if u.ChatMember != nil {
+		return u.ChatMember.Chat
+	}
+	if u.MyChatMember != nil {
+		return u.MyChatMember.Chat
+	}
+	log.Fatalf("[%s] Can't get ChatID of update %v+", u.UpdateID, u.U)
+	return echotron.Chat{}
+}
+
 func (u *Update) ChatID() int64 {
 	if u.IsMessage() {
 		return u.Message.Chat.ID
@@ -160,6 +180,15 @@ func (u *Update) From() *echotron.User {
 	if u.IsMessage() {
 		return u.Message.From
 	}
+	if u.EditedMessage != nil {
+		return u.EditedMessage.From
+	}
+	if u.ChatMember != nil {
+		return &u.ChatMember.From
+	}
+	if u.MyChatMember != nil {
+		return &u.MyChatMember.From
+	}
 	return u.CallbackQuery.From
 }
 
@@ -177,7 +206,10 @@ func (u *Update) Entities() []*echotron.MessageEntity {
 	return u.Message.CaptionEntities
 }
 
-func (u *Update) IsUserAdmin() bool {
+func IsUserAdmin(u *Update) bool {
+	if IsPrivate(u) {
+		return true
+	}
 	member, err := u.Bot.GetChatMember(u.ChatID(), u.From().ID)
 	if err != nil {
 		return false
@@ -185,6 +217,14 @@ func (u *Update) IsUserAdmin() bool {
 	return member.Result.Status == "administrator" || member.Result.Status == "creator"
 }
 
+func IsPrivate(u *Update) bool {
+	return u.ChatID() > 0
+}
+
+func IsForum(u *Update) bool {
+	return u.Chat().IsForum
+}
+
 func (u *Update) LogError(text string, e error, send bool) {
 	if text != "" {
 		text = "Ошибка: " + text