private async Task <HttpResponseMessage> HandleGetRequest(FlowRequestContext context)
{
FlowRequest request = await _requestReader.ReadGetAsync(context.HttpRequest);
if (!IsValidRequest(context, request))
{
return(context.HttpRequest.CreateErrorResponse(
HttpStatusCode.BadRequest,
"Invalid flow GET request"));
}
string filePath = GetChunkFilePath(context, request);
if (!await _fileSystem.ExistsAsync(filePath))
{
return(context.HttpRequest.CreateErrorResponse(
HttpStatusCode.NoContent,
"No Content"));
}
return(context.HttpRequest.CreateResponse(HttpStatusCode.OK));
}
private async Task <HttpResponseMessage> HandlePostRequest(FlowRequestContext context)
{
// read request
FlowRequest request = await _requestReader.ReadPostAsync(
context,
_fileSystem);
// is valid request?
if (!IsValidRequest(context, request))
{
await _fileSystem.DeleteAsync(request.TemporaryFile.Item1);
return(context.HttpRequest.CreateErrorResponse(
HttpStatusCode.BadRequest,
"Invalid flow POST request"));
}
// upload temporary to chunks
var chunkFilePath = GetChunkFilePath(context, request);
using (Stream chunkStream = await _fileSystem.OpenWriteAsync(chunkFilePath))
{
using (Stream tempStream = await _fileSystem.OpenReadAsync(request.TemporaryFile.Item1))
{
await tempStream.CopyToAsync(chunkStream);
}
}
// delete temporary
await _fileSystem.DeleteAsync(request.TemporaryFile.Item1);
// if last chunk combine and move to files
if (request.IsLastChunk)
{
await CombineAsync(context, request);
}
return(context.HttpRequest.CreateResponse(HttpStatusCode.OK));
}
private bool IsValidRequest(FlowRequestContext context, FlowRequest request)
{
if (!request.FlowChunkNumber.HasValue ||
!request.FlowChunkSize.HasValue ||
!request.FlowTotalSize.HasValue)
{
return(false);
}
ulong chunkNumber = request.FlowChunkNumber.Value;
ulong chunkSize = request.FlowChunkSize.Value;
ulong totalSize = request.FlowTotalSize.Value;
if (chunkNumber == 0 || chunkSize == 0 || totalSize == 0)
{
return(false);
}
double numberOfChunks =
Math.Max(Math.Floor(request.FlowTotalSize.Value / (request.FlowChunkSize.Value * 1.0)), 1);
if (chunkNumber > numberOfChunks)
{
return(false);
}
if (totalSize > context.MaxFileSize)
{
return(false);
}
if (chunkSize > context.MaxFileSize)
{
return(false);
}
return(true);
}