Treat anonymous admins as admins for /bridge, /thread etc.

When a group owner/admin enables "Remain anonymous", their messages
are sent from @GroupAnonymousBot with msg.SenderChat pointing to the
group itself. GetChatMember was then checking the bot's status (not
admin) and rejecting valid owners with "only for admins".

New helper isTgAnonymousAdmin(msg) returns true when SenderChat.ID
equals Chat.ID; in that case we skip the GetChatMember check and
treat the user as admin.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin.go

@@ -17,6 +17,16 @@ func isTgAdmin(memberStatus string) bool {
 	return memberStatus == "creator" || memberStatus == "administrator"
 }
 
+// isTgAnonymousAdmin returns true if the message was sent by an anonymous admin
+// (owner/admin with "Remain anonymous" enabled). In this case msg.From is
+// @GroupAnonymousBot and msg.SenderChat is the group itself.
+func isTgAnonymousAdmin(msg *TGMessage) bool {
+	if msg == nil || msg.SenderChat == nil {
+		return false
+	}
+	return msg.SenderChat.ID == msg.Chat.ID
+}
+
 // isMaxGroup returns true if the MAX chat type indicates a group.
 func isMaxGroup(chatType maxschemes.ChatType) bool {
 	return chatType == maxschemes.CHAT || chatType == maxschemes.CHANNEL

admin_test.go

@@ -50,6 +50,27 @@ func TestIsTgAdmin(t *testing.T) {
 	}
 }
 
+func TestIsTgAnonymousAdmin(t *testing.T) {
+	chat := ChatInfo{ID: -100123, Type: "supergroup"}
+	tests := []struct {
+		name string
+		msg  *TGMessage
+		want bool
+	}{
+		{"nil", nil, false},
+		{"no sender chat", &TGMessage{Chat: chat}, false},
+		{"different sender chat", &TGMessage{Chat: chat, SenderChat: &ChatInfo{ID: -999}}, false},
+		{"same sender chat (anonymous)", &TGMessage{Chat: chat, SenderChat: &ChatInfo{ID: chat.ID}}, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := isTgAnonymousAdmin(tt.msg); got != tt.want {
+				t.Errorf("got %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
 func TestIsMaxGroup(t *testing.T) {
 	tests := []struct {
 		name     string

telegram.go

@@ -289,10 +289,15 @@ func (b *Bridge) listenTelegram(ctx context.Context) {
 			// Проверка прав админа в группах
 			isGroup := isTgGroup(msg.Chat.Type)
 			isAdmin := false
-			if isGroup && msg.From != nil {
-				status, err := b.tg.GetChatMember(ctx, msg.Chat.ID, msg.From.ID)
-				if err == nil {
-					isAdmin = isTgAdmin(status)
+			if isGroup {
+				if isTgAnonymousAdmin(msg) {
+					// Владелец/админ с "Remain anonymous" — шлёт от имени группы
+					isAdmin = true
+				} else if msg.From != nil {
+					status, err := b.tg.GetChatMember(ctx, msg.Chat.ID, msg.From.ID)
+					if err == nil {
+						isAdmin = isTgAdmin(status)
+					}
 				}
 			}