private static async Task ProvideThumbnail(HttpListenerRequest request, HttpListenerResponse response)
{
var param = request.RequestUri.ParseQueryParameters();
var sessionId = param.GetByKey(Consts.SessionId);
var itemId = param.GetByKey(Consts.ItemId);
//Env.Logger.Log("Get Thumbnail start " + itemId, "Http");
bool provided = false;
BrowseResponder br = SuperDriveCore.Conversations.GetByKey(sessionId) as BrowseResponder;
if (br != null)
{
DirItem dir = br.CurrentFolder;
var f = dir?.Children.FirstOrDefault(d => d.Id == itemId) as FileItem;
if (f != null)
{
//不能在这里关闭流。因为response的close函数里面会使用这个流。想要关闭，除非
//把内容复制给OutputStream.
using (var rep = response)
{
response.OutputStream = await Env.FileSystem.GetThumbnailStream(f);
provided = true;
Env.Logger.Log("Get Thumbnail End " + itemId, "Http");
}
}
}
if (!provided)
{
response.NotFound();
response.Dispose();
}
}
private static async Task ProvideItem(HttpListenerRequest request, HttpListenerResponse response)
{
var param = request.RequestUri.ParseQueryParameters();
var sessionId = param.GetByKey(Consts.SessionId);
var itemId = param.GetByKey(Consts.ItemId);
bool provided = false;
//能够提供文件的会话，可能是SendItemsRequester,或者是BrowseResponder,或者是GetItemsResponder(不再需要这个了？)
IItemProviderConversation br = SuperDriveCore.Conversations.GetByKey(sessionId) as IItemProviderConversation;
FileItem fi = br?.FindItem(itemId) as FileItem;
if (fi != null)
{
try
{
response.Headers.ContentLength = fi.Length;
response.UseMemoryStream = false;
await response.WriteHeaders();
var buffer = new byte[1024 * 1024];
using (var stream = fi.Open(FileMode.Open, FileAccess.Read))
{
int count;
while (!fi.IsTransferEnd() && (count = await fi.ReadAsync(buffer)) != 0)
{
await response.GetSocketStream().WriteAsync(buffer, 0, count);
provided = true;
Env.Logger.Log("Get Item End " + itemId, "Http");
}
}
response.Dispose();
}
catch (Exception e)
{
Env.Logger.Log($"Provide item[{fi}] exception", stackTrace: e.StackTrace);
//TODO 这里没机会改Stats code了。只能强制关闭socket。
response.CloseSocket();
}
}
if (!provided)
{
response.Forbidden();
response.Dispose();
}
}