update check base64

utils/util.go

@@ -116,7 +116,15 @@ func IsBase64ImageStr(imageStr string) (bool, []byte, string, string) {
 		log.WithError(err).Error("base64 decode string failed")
 		return false, nil, "", ""
 	}
-	formatStr := strings.Split(strings.Split(base64CodePrefix, ";")[0], ":")[1]
+	dataSuffix := strings.Split(base64CodePrefix, ";")
+	if len(dataSuffix) < 1 {
+		return false, nil, "", ""
+	}
+	formatStrArr := strings.Split(dataSuffix[0], ":")
+	if len(formatStrArr) < 2 {
+		return false, nil, "", ""
+	}
+	formatStr := formatStrArr[1]
 	suffix := strings.Split(formatStr, "/")[1]
 	return true, decodeBytes, formatStr, suffix
 }