fix: refresh auth issue

pkg/connector/handle_message.go

@@ -23,6 +23,8 @@ import (
 	"github.com/highesttt/matrix-line-messenger/pkg/line"
 )
 
+const lineDecryptFallbackText = "[Unable to decrypt message. Open an issue on GitHub.]"
+
 func (lc *LineClient) newMessageHandler() *handlers.Handler {
 	return &handlers.Handler{
 		Log:               lc.UserLogin.Bridge.Log,
@@ -208,8 +210,8 @@ func (lc *LineClient) parseMessageTimestamp(msg *line.Message) time.Time {
 func (lc *LineClient) decryptMessageBody(msg *line.Message, portalIDStr string, opType int) (bodyText, unwrappedText string) {
 	// Handle Content
 	bodyText = msg.Text
-	if bodyText == "" && len(msg.Chunks) > 0 {
-		bodyText = "[Unable to decrypt message. Open an issue on GitHub.]"
+	if len(msg.Chunks) > 0 && (bodyText == "" || isLineDecryptFallbackText(bodyText)) {
+		bodyText = ""
 		if lc.E2EE != nil {
 			// Ensure peer keys are available before attempting decryption
 			lc.ensurePeerKeyForMessage(context.Background(), msg)
@@ -304,6 +306,10 @@ func (lc *LineClient) decryptMessageBody(msg *line.Message, portalIDStr string,
 	return bodyText, unwrappedText
 }
 
+func isLineDecryptFallbackText(text string) bool {
+	return strings.TrimSpace(text) == lineDecryptFallbackText
+}
+
 // convertLineMessage converts an inbound LINE message into a Matrix
 // ConvertedMessage. bodyText/unwrappedText are the (decrypted) message text as
 // returned by decryptMessageBody. Shared by the live message path and backfill.

pkg/connector/handle_message_test.go

@@ -0,0 +1,42 @@
+package connector
+
+import (
+	"testing"
+
+	"github.com/highesttt/matrix-line-messenger/pkg/line"
+)
+
+func TestDecryptMessageBodySkipsGeneratedFallbackWhenDecryptUnavailable(t *testing.T) {
+	msg := &line.Message{
+		Text:   "",
+		Chunks: []string{"encrypted"},
+	}
+
+	bodyText, unwrappedText := (&LineClient{}).decryptMessageBody(msg, "chat-mid", int(OpReceiveMessage))
+	if bodyText != "" || unwrappedText != "" {
+		t.Fatalf("decryptMessageBody returned body=%q unwrapped=%q, want empty strings", bodyText, unwrappedText)
+	}
+}
+
+func TestDecryptMessageBodyTreatsLineFallbackAsEncryptedFailure(t *testing.T) {
+	msg := &line.Message{
+		Text:   lineDecryptFallbackText,
+		Chunks: []string{"encrypted"},
+	}
+
+	bodyText, unwrappedText := (&LineClient{}).decryptMessageBody(msg, "chat-mid", int(OpReceiveMessage))
+	if bodyText != "" || unwrappedText != "" {
+		t.Fatalf("decryptMessageBody returned body=%q unwrapped=%q, want empty strings", bodyText, unwrappedText)
+	}
+}
+
+func TestDecryptMessageBodyKeepsFallbackTextWithoutEncryptedChunks(t *testing.T) {
+	msg := &line.Message{
+		Text: lineDecryptFallbackText,
+	}
+
+	bodyText, unwrappedText := (&LineClient{}).decryptMessageBody(msg, "chat-mid", int(OpReceiveMessage))
+	if bodyText != lineDecryptFallbackText || unwrappedText != lineDecryptFallbackText {
+		t.Fatalf("decryptMessageBody returned body=%q unwrapped=%q, want fallback text", bodyText, unwrappedText)
+	}
+}