/// <summary>
/// The function responsible for handling each request. This function can be implemented by subclassing
/// of this class and using override. The function is provided with the request header, request body, and
/// the response encoder which allows setting of headers and data if any.
/// </summary>
/// <param name="header"></param>
/// <param name="body"></param>
/// <param name="encoder"></param>
/// <returns></returns>
public virtual async Task <Task> HandleRequest(Dictionary <String, String> header, Stream body, IProxyHTTPEncoder encoder)
{
var outheader = new Dictionary <String, String>();
outheader.Add("$response_code", "200");
outheader.Add("$response_text", "OK");
await encoder.WriteHeader(outheader);
MemoryStream ms = new MemoryStream();
byte[] something = Encoding.UTF8.GetBytes("hello world\n");
ms.Write(something, 0, something.Length);
ms.Write(something, 0, something.Length);
ms.Write(something, 0, something.Length);
ms.Write(something, 0, something.Length);
ms.Write(something, 0, something.Length);
ms.Position = 0;
//await encoder.BodyWriteSingleChunk("response test body");
await encoder.BodyWriteStream(ms);
return(Task.CompletedTask);
}
public async Task <Task> SendStream(Stream s)
{
header.Add("$response_code", response_code.ToString());
header.Add("$response_text", response_text);
await proxy.WriteHeader(header);
return(await proxy.BodyWriteStream(s));
}
static public async Task <Task> Action(ServerHandler shandler, HTTPRequest request, Stream body, IProxyHTTPEncoder encoder)
{
// This URL route was never implemented with user security. The security ID itself is the security, but that
// could be revised.
//var auth = await ReadMessageFromStreamAndAuthenticate(1024 * 16, body);
//if (!auth.success)
//{
// throw new UnauthorizedException();
//}
String download_sid;
if (request.query_string.Length > 0)
{
download_sid = request.query_string;
}
else
{
//req = JsonConvert.DeserializeObject<HandleDownloadRequest>(auth.payload);
//download_sid = req.security_id;
throw new InvalidArgumentException();
}
Item item;
lock (shandler.items)
{
if (!shandler.items.ContainsKey(download_sid))
{
throw new InvalidArgumentException();
}
item = shandler.items[download_sid];
}
var item_data_path = Path.Combine(shandler.data_path, item.node);
var fd = File.OpenRead(item_data_path);
ulong offset_start = 0;
// How can a stream be negative? Could this stream ever be negative? What purpose does it suit?
ulong offset_size = (ulong)fd.Length;
ulong total_size = (ulong)fd.Length;
String response_code = "200";
if (request.internal_headers.ContainsKey("range"))
{
var range_str = request.internal_headers["range"];
var eqndx = range_str.IndexOf("=");
if (eqndx > -1)
{
var range_sub_str = range_str.Substring(eqndx + 1).Trim();
var range_nums_strs = range_sub_str.Split("-");
if (range_nums_strs.Length > 1)
{
offset_start = ulong.Parse(range_nums_strs[0]);
if (range_nums_strs[1].Equals(""))
{
offset_size = (ulong)fd.Length - offset_start;
}
else
{
offset_size = ulong.Parse(range_nums_strs[1]) - offset_start + 1;
}
response_code = "206";
}
}
}
checked
{
fd.Seek((long)offset_start, SeekOrigin.Begin);
}
fd.Seek((long)offset_start, SeekOrigin.Begin);
String mime_type = null;
switch (item.datatype)
{
case "mp4":
mime_type = "video/mp4";
break;
case "jpg":
mime_type = "image/jpeg";
break;
}
using (var de_stream = new LimitedStream(fd, offset_size))
{
var header = new Dictionary <String, String>();
header.Add("$response_code", response_code);
header.Add("$response_text", "Partial Content");
header.Add("content-disposition",
String.Format("inline; filename=\"{0}_{1}_{2}_{3}.{4}\"",
item.datestr,
item.userstr,
item.devicestr,
item.timestr,
item.datatype
)
);
header.Add("accept-ranges", "bytes");
header.Add("content-range",
String.Format("bytes {0}-{1}/{2}",
offset_start,
offset_size + offset_start - 1,
total_size
)
);
if (mime_type != null)
{
header.Add("content-type", mime_type);
}
await encoder.WriteHeader(header);
await encoder.BodyWriteStream(de_stream);
return(Task.CompletedTask);
}
}