private void HandleFatalWebException(WebException e, FtpDownloadRequest request)
{
switch ((e.Response as FtpWebResponse).StatusCode)
{
case FtpStatusCode.ActionNotTakenFileUnavailable:
throw new InvalidFtpFileAccessException(request.FileName);
default:
throw new UnknownException(e);
}
}
public IActionResult Get(string id, string type)
{
FtpDownloadRequest request = new FtpDownloadRequest()
{
FileName = id,
Folder = ImageTypeFolderResolver[type == null ? "" : type],
FtpInfo = AppConfig.GetFtpConnectionInformation()
};
FtpDownloadResponse <byte[]> response = null;
try
{
response = FtpDownloaderLogic.DownloadImage(request);
return(File(response.FileContent, "image/jpeg"));
}
catch (Exception e)
{
string errorText = CreateErrorTextForFileQueryException(e);
return(new JsonResult(new { error = errorText, fileName = id }));
}
}
public FtpDownloadResponse <string> DownloadText(FtpDownloadRequest request)
{
throw new NotImplementedException();
}
public FtpDownloadResponse <byte[]> DownloadImage(FtpDownloadRequest request)
{
if (request.FtpInfo == null)
{
throw new InvalidFtpConnectionInformationException(request.FtpInfo);
}
string uri = $"ftp://{request.FtpInfo.Host}:{request.FtpInfo.Port}/";
if (string.IsNullOrWhiteSpace(request.Folder))
{
uri += request.FileName;
}
else
{
uri += $"{request.Folder}/{request.FileName}";
}
FtpWebRequest ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(uri);
ftpWebRequest.Credentials = new NetworkCredential(request.FtpInfo.UserName, request.FtpInfo.Password);
ftpWebRequest.KeepAlive = false;
ftpWebRequest.UseBinary = true;
ftpWebRequest.EnableSsl = request.FtpInfo.EnableSsl;
ftpWebRequest.Method = WebRequestMethods.Ftp.DownloadFile;
byte[] fileContent = null;
try
{
using (Stream stream = GetStream(ftpWebRequest, request.FileName))
{
List <byte> fileContentList = new List <byte>();
byte[] buffer = new byte[102400];
int bytes = 0;
do
{
bytes = stream.Read(buffer, 0, buffer.Length);
if (bytes == buffer.Length)
{
fileContentList.AddRange(buffer);
}
else
{
byte[] tempBuffer = new byte[bytes];
for (int i = 0; i < bytes; i++)
{
tempBuffer[i] = buffer[i];
}
fileContentList.AddRange(tempBuffer);
}
} while (bytes != 0);
fileContent = fileContentList.ToArray();
}
}
catch (Exception e)
{
if (e is WebException)
{
HandleFatalWebException(e as WebException, request);
}
}
return(new FtpDownloadResponse <byte[]>()
{
FileContent = fileContent,
FileName = request.FileName
});
}
