private static void DownloadFile(HttpContext context)
{
var flushed = false;
try
{
var id = context.Request[FilesLinkUtility.FileId];
var doc = context.Request[FilesLinkUtility.DocShareKey] ?? "";
using (var fileDao = Global.DaoFactory.GetFileDao())
{
File file;
var readLink = FileShareLink.Check(doc, true, fileDao, out file);
if (!readLink && file == null)
{
fileDao.InvalidateCache(id);
int version;
file = int.TryParse(context.Request[FilesLinkUtility.Version], out version) && version > 0
? fileDao.GetFile(id, version)
: fileDao.GetFile(id);
}
if (file == null)
{
context.Response.StatusCode = (int)HttpStatusCode.NotFound;
return;
}
if (!readLink && !Global.GetFilesSecurity().CanRead(file))
{
context.Response.StatusCode = (int)HttpStatusCode.Forbidden;
return;
}
if (!string.IsNullOrEmpty(file.Error))
{
throw new Exception(file.Error);
}
if (!fileDao.IsExistOnStorage(file))
{
Global.Logger.ErrorFormat("Download file error. File is not exist on storage. File id: {0}.", file.ID);
context.Response.StatusCode = (int)HttpStatusCode.NotFound;
return;
}
FileMarker.RemoveMarkAsNew(file);
context.Response.Clear();
context.Response.ClearHeaders();
context.Response.Charset = "utf-8";
FilesMessageService.Send(file, context.Request, MessageAction.FileDownloaded, file.Title);
if (string.Equals(context.Request.Headers["If-None-Match"], GetEtag(file)))
{
//Its cached. Reply 304
context.Response.StatusCode = (int)HttpStatusCode.NotModified;
context.Response.Cache.SetETag(GetEtag(file));
}
else
{
context.Response.CacheControl = "public";
context.Response.Cache.SetETag(GetEtag(file));
context.Response.Cache.SetCacheability(HttpCacheability.Public);
Stream fileStream = null;
try
{
var title = file.Title;
if (file.ContentLength <= SetupInfo.AvailableFileSize)
{
var ext = FileUtility.GetFileExtension(file.Title);
var outType = (context.Request[FilesLinkUtility.OutType] ?? "").Trim();
if (!string.IsNullOrEmpty(outType) &&
FileUtility.ExtsConvertible.Keys.Contains(ext) &&
FileUtility.ExtsConvertible[ext].Contains(outType))
{
ext = outType;
}
long offset = 0;
long length;
if (!file.ProviderEntry &&
string.Equals(context.Request["convpreview"], "true", StringComparison.InvariantCultureIgnoreCase) &&
FFmpegService.IsConvertable(ext))
{
const string mp4Name = "content.mp4";
var mp4Path = FileDao.GetUniqFilePath(file, mp4Name);
var store = Global.GetStore();
if (!store.IsFile(mp4Path))
{
fileStream = fileDao.GetFileStream(file);
Global.Logger.InfoFormat("Converting {0} (fileId: {1}) to mp4", file.Title, file.ID);
var stream = FFmpegService.Convert(fileStream, ext);
store.Save(string.Empty, mp4Path, stream, mp4Name);
}
var fullLength = store.GetFileSize(string.Empty, mp4Path);
length = ProcessRangeHeader(context, fullLength, ref offset);
fileStream = store.GetReadStream(string.Empty, mp4Path, (int)offset);
title = FileUtility.ReplaceFileExtension(title, ".mp4");
}
else
{
if (!FileConverter.EnableConvert(file, ext))
{
if (!readLink && fileDao.IsSupportedPreSignedUri(file))
{
context.Response.Redirect(fileDao.GetPreSignedUri(file, TimeSpan.FromHours(1)).ToString(), true);
return;
}
fileStream = fileDao.GetFileStream(file); // getStream to fix file.ContentLength
if (fileStream.CanSeek)
{
var fullLength = file.ContentLength;
length = ProcessRangeHeader(context, fullLength, ref offset);
fileStream.Seek(offset, SeekOrigin.Begin);
}
else
{
length = file.ContentLength;
}
}
else
{
title = FileUtility.ReplaceFileExtension(title, ext);
fileStream = FileConverter.Exec(file, ext);
length = fileStream.Length;
}
}
SendStreamByChunks(context, length, title, fileStream, ref flushed);
}
else
{
if (!readLink && fileDao.IsSupportedPreSignedUri(file))
{
context.Response.Redirect(fileDao.GetPreSignedUri(file, TimeSpan.FromHours(1)).ToString(), true);
return;
}
fileStream = fileDao.GetFileStream(file); // getStream to fix file.ContentLength
long offset = 0;
var length = file.ContentLength;
if (fileStream.CanSeek)
{
length = ProcessRangeHeader(context, file.ContentLength, ref offset);
fileStream.Seek(offset, SeekOrigin.Begin);
}
SendStreamByChunks(context, length, title, fileStream, ref flushed);
}
}
catch (ThreadAbortException tae)
{
Global.Logger.Error("DownloadFile", tae);
}
catch (HttpException e)
{
Global.Logger.Error("DownloadFile", e);
throw new HttpException((int)HttpStatusCode.BadRequest, e.Message);
}
finally
{
if (fileStream != null)
{
fileStream.Close();
fileStream.Dispose();
}
}
try
{
context.Response.Flush();
context.Response.SuppressContent = true;
context.ApplicationInstance.CompleteRequest();
flushed = true;
}
catch (HttpException ex)
{
Global.Logger.Error("DownloadFile", ex);
}
}
}
}
catch (ThreadAbortException tae)
{
Global.Logger.Error("DownloadFile", tae);
}
catch (Exception ex)
{
// Get stack trace for the exception with source file information
var st = new StackTrace(ex, true);
// Get the top stack frame
var frame = st.GetFrame(0);
// Get the line number from the stack frame
var line = frame.GetFileLineNumber();
Global.Logger.ErrorFormat("Url: {0} {1} IsClientConnected:{2}, line number:{3} frame:{4}", context.Request.Url, ex, context.Response.IsClientConnected, line, frame);
if (!flushed && context.Response.IsClientConnected)
{
context.Response.StatusCode = 400;
context.Response.Write(HttpUtility.HtmlEncode(ex.Message));
}
}
}
