public static string Get(string disposition)
{
if (string.IsNullOrWhiteSpace(disposition))
{
return(string.Empty);
}
var result = string.Empty;
try {
result = new ContentDisposition(disposition).FileName;
const string B64 = "?B?";
var b64Index = result.IndexOf(B64, StringComparison.InvariantCultureIgnoreCase);
if (b64Index > -1)
{
result = result.Substring(b64Index + B64.Length, result.Length - b64Index - B64.Length).Trim('\"').Replace("?=", "");
result = Encoding.UTF8.GetString(Convert.FromBase64String(result));
}
} catch {
foreach (var item in disposition.Split(";").Select(i => i.Trim()))
{
const string FILENAME = "filename";
var fileNameIndex = item.IndexOf(FILENAME, StringComparison.InvariantCultureIgnoreCase);
if (fileNameIndex > -1)
{
var quotesIndex = item.IndexOf("''", fileNameIndex, StringComparison.InvariantCultureIgnoreCase);
if (quotesIndex > -1)
{
result = item.Substring(quotesIndex + 2, item.Length - quotesIndex - 2);
}
else
{
quotesIndex = item.IndexOf("\"", fileNameIndex, StringComparison.InvariantCultureIgnoreCase);
if (quotesIndex > -1)
{
result = item.Substring(quotesIndex + 1, item.Length - quotesIndex - 2);
}
else
{
result = item.Substring(fileNameIndex + FILENAME.Length + 1, item.Length - FILENAME.Length - 1);
}
}
}
if (!string.IsNullOrWhiteSpace(result))
{
break;
}
}
}
if (string.IsNullOrEmpty(result))
{
_logger.Warn($"Не удалось получить имя файла из {disposition}");
}
return(HttpUtility.UrlDecode(result));
}