handlematrix: implement DeleteChatHandlingNetworkAPI (#851)

Author: 1Conan

pkg/connector/capabilities.go

@@ -50,7 +50,7 @@ func (wa *WhatsAppConnector) GetCapabilities() *bridgev2.NetworkGeneralCapabilit
 }
 
 func (wa *WhatsAppConnector) GetBridgeInfoVersion() (info, caps int) {
-	return 1, 4
+	return 1, 5
 }
 
 const WAMaxFileSize = 2000 * 1024 * 1024
@@ -65,7 +65,7 @@ func supportedIfFFmpeg() event.CapabilitySupportLevel {
 }
 
 func capID() string {
-	base := "fi.mau.whatsapp.capabilities.2025_08_25+1"
+	base := "fi.mau.whatsapp.capabilities.2025_10_07"
 	if ffmpeg.Supported() {
 		return base + "+ffmpeg"
 	}
@@ -176,6 +176,7 @@ var whatsappCaps = &event.RoomFeatures{
 	ReadReceipts:        true,
 	TypingNotifications: true,
 	DisappearingTimer:   waDisappearingCap,
+	DeleteChat:          true,
 }
 
 var whatsappCAGCaps *event.RoomFeatures

pkg/connector/handlematrix.go

@@ -45,6 +45,7 @@ var (
 	_ bridgev2.MuteHandlingNetworkAPI           = (*WhatsAppClient)(nil)
 	_ bridgev2.TagHandlingNetworkAPI            = (*WhatsAppClient)(nil)
 	_ bridgev2.MarkedUnreadHandlingNetworkAPI   = (*WhatsAppClient)(nil)
+	_ bridgev2.DeleteChatHandlingNetworkAPI     = (*WhatsAppClient)(nil)
 )
 
 func (wa *WhatsAppClient) HandleMatrixPollStart(ctx context.Context, msg *bridgev2.MatrixPollStart) (*bridgev2.MatrixMessageResponse, error) {
@@ -595,14 +596,10 @@ func (wa *WhatsAppClient) HandleRoomTag(ctx context.Context, msg *bridgev2.Matri
 	return wa.Client.SendAppState(ctx, appstate.BuildPin(chatJID, isFavorite))
 }
 
-func (wa *WhatsAppClient) HandleMarkedUnread(ctx context.Context, msg *bridgev2.MatrixMarkedUnread) error {
-	chatJID, err := waid.ParsePortalID(msg.Portal.ID)
+func (wa *WhatsAppClient) getLastMessageInfo(ctx context.Context, chatJID types.JID, portalKey networkid.PortalKey) (time.Time, *waCommon.MessageKey, error) {
+	msgs, err := wa.Main.Bridge.DB.Message.GetLastNInPortal(ctx, portalKey, 1)
 	if err != nil {
-		return err
-	}
-	msgs, err := wa.Main.Bridge.DB.Message.GetLastNInPortal(ctx, msg.Portal.PortalKey, 1)
-	if err != nil {
-		return fmt.Errorf("failed to get last message in portal: %w", err)
+		return time.Time{}, nil, fmt.Errorf("failed to get last message in portal: %w", err)
 	}
 	var lastTS time.Time
 	var lastKey *waCommon.MessageKey
@@ -623,5 +620,32 @@ func (wa *WhatsAppClient) HandleMarkedUnread(ctx context.Context, msg *bridgev2.
 			}
 		}
 	}
+	return lastTS, lastKey, nil
+}
+
+func (wa *WhatsAppClient) HandleMarkedUnread(ctx context.Context, msg *bridgev2.MatrixMarkedUnread) error {
+	chatJID, err := waid.ParsePortalID(msg.Portal.ID)
+	if err != nil {
+		return err
+	}
+	lastTS, lastKey, err := wa.getLastMessageInfo(ctx, chatJID, msg.Portal.PortalKey)
+	if err != nil {
+		return err
+	}
 	return wa.Client.SendAppState(ctx, appstate.BuildMarkChatAsRead(chatJID, msg.Content.Unread, lastTS, lastKey))
 }
+
+func (wa *WhatsAppClient) HandleMatrixDeleteChat(ctx context.Context, msg *bridgev2.MatrixDeleteChat) error {
+	chatJID, err := waid.ParsePortalID(msg.Portal.ID)
+	if err != nil {
+		return err
+	}
+	lastTS, lastKey, err := wa.getLastMessageInfo(ctx, chatJID, msg.Portal.PortalKey)
+	if err != nil {
+		return err
+	}
+	if lastKey == nil {
+		return fmt.Errorf("failed to delete chat: no messages found")
+	}
+	return wa.Client.SendAppState(ctx, appstate.BuildDeleteChat(chatJID, lastTS, lastKey))
+}