public override async Task <Stream> Handle(HttpRequest request, HttpResponse response)
{
Log.LogDebug("HandleStream get file");
string file = string.Empty;
if (request.Query.ContainsKey(string.Empty))
{
file = request.Query[string.Empty][0];
file = HttpUtility.UrlDecode(file);
}
if (ProgramSettings.Settings.Dlna && !string.IsNullOrEmpty(file))
{
try {
var fileRequest = await FileRequest.Create(request, file);
if (fileRequest.File.Exists && Tools.Tools.CheckAccessPath(fileRequest.File.FullName))
{
response.Headers.Add("Accept-Ranges", "bytes");
if (ValidateRanges(response, fileRequest) &&
ValidateModificationDate(request, response, fileRequest) &&
ValidateEntityTag(request, response, fileRequest))
{
response.Headers.Add("Last-Modified", fileRequest.File.LastWriteTime.ToString("r"));
response.Headers["Etag"] = fileRequest.EntityTag;
if (!fileRequest.RangeRequest)
{
response.ContentLength = fileRequest.File.Length;
response.ContentType = fileRequest.ContentType;
response.StatusCode = (int)HttpStatusCode.OK;
var fileStream = fileRequest.File.OpenRead();
fileStream.Position = 0;
return(fileStream);
}
else
{
response.ContentLength = fileRequest.GetContentLength();
if (!fileRequest.MultipartRequest)
{
response.Headers.Add("Content-Range",
$"bytes {fileRequest.RangesStartIndexes[0]}-{fileRequest.RangesEndIndexes[0]}/{fileRequest.File.Length}");
response.ContentType = fileRequest.ContentType;
}
else
{
response.ContentType =
$"multipart/byteranges; boundary={fileRequest.Boundary}";
}
response.StatusCode = (int)HttpStatusCode.PartialContent;
var fileStream = fileRequest.File.OpenRead();
fileStream.Position = fileRequest.RangesStartIndexes[0];
return(fileStream);
}
}
}
else
{
Log.LogDebug("File not found: {0}", file);
response.StatusCode = (int)HttpStatusCode.NotFound;
}
} catch (Exception exception) {
Log.LogError(exception);
response.StatusCode = (int)HttpStatusCode.NotFound;
}
}
else
{
Log.LogDebug("Incorrect parameter: {0}", file);
response.StatusCode = (int)HttpStatusCode.NoContent;
}
return(null);
}
private static bool ValidateEntityTag(HttpRequest request, HttpResponse response, FileRequest fileRequest)
{
if (request.Headers.ContainsKey("If-Match"))
{
string matchHeader = request.Headers["If-Match"];
if (matchHeader != "*")
{
var entitiesTags = matchHeader.Split(FileRequest.CommaSplitArray);
int entitieTagIndex = 0;
for (; entitieTagIndex < entitiesTags.Length; entitieTagIndex++)
{
if (fileRequest.EntityTag == entitiesTags[entitieTagIndex])
{
break;
}
}
if (entitieTagIndex >= entitiesTags.Length)
{
response.StatusCode = (int)HttpStatusCode.PreconditionFailed;
return(false);
}
}
}
if (request.Headers.ContainsKey("If-None-Match"))
{
string noneMatchHeader = request.Headers["If-None-Match"];
if (!string.IsNullOrEmpty(noneMatchHeader))
{
if (noneMatchHeader == "*")
{
response.StatusCode = (int)HttpStatusCode.PreconditionFailed;
return(false);
}
var entitiesTags = noneMatchHeader.Split(FileRequest.CommaSplitArray);
if (entitiesTags.All(entityTag => fileRequest.EntityTag == entityTag))
{
response.Headers["Etag"] = fileRequest.EntityTag;
response.StatusCode = (int)HttpStatusCode.NotModified;
return(false);
}
}
}
return(true);
}