feat: enhance image decoding logic to handle base64 file types and improve error handling

service/token_counter.go

@@ -120,11 +120,12 @@ func getImageToken(info *relaycommon.RelayInfo, imageUrl *dto.MessageImageUrl, m
 	var config image.Config
 	var err error
 	var format string
+	var b64str string
 	if strings.HasPrefix(imageUrl.Url, "http") {
 		config, format, err = DecodeUrlImageData(imageUrl.Url)
 	} else {
 		common.SysLog(fmt.Sprintf("decoding image"))
-		config, format, _, err = DecodeBase64ImageData(imageUrl.Url)
+		config, format, b64str, err = DecodeBase64ImageData(imageUrl.Url)
 	}
 	if err != nil {
 		return 0, err
@@ -132,7 +133,12 @@ func getImageToken(info *relaycommon.RelayInfo, imageUrl *dto.MessageImageUrl, m
 	imageUrl.MimeType = format
 
 	if config.Width == 0 || config.Height == 0 {
-		return 0, errors.New(fmt.Sprintf("fail to decode image config: %s", imageUrl.Url))
+		// not an image
+		if format != "" && b64str != "" {
+			// file type
+			return 3 * baseTokens, nil
+		}
+		return 0, errors.New(fmt.Sprintf("fail to decode base64 config: %s", imageUrl.Url))
 	}
 
 	shortSide := config.Width