Update main.go

main.go

@@ -1722,9 +1722,10 @@ func generateSignature(messageText string, requestID string, timestampMs int64,
 	derivedHex := fmt.Sprintf("%x", h.Sum(nil))
 
 	// Layer2: 生成签名
+	encodedMessage := base64.StdEncoding.EncodeToString([]byte(messageText))
 	canonicalString := fmt.Sprintf(
 		"requestId,%s,timestamp,%d,user_id,%s|%s|%d",
-		requestID, timestampMs, userID, messageText, timestampMs,
+		requestID, timestampMs, userID, encodedMessage, timestampMs,
 	)
 	h2 := hmac.New(sha256.New, []byte(derivedHex))
 	h2.Write([]byte(canonicalString))