/// <summary>
/// Parses url encoded form data
/// </summary>
/// <returns>An awaitable task.</returns>
/// <param name="reader">The stream to read from.</param>
/// <param name="config">The server configuration.</param>
/// <param name="idletime">The maximum idle time.</param>
/// <param name="timeouttask">A task that signals request timeout.</param>
/// <param name="stoptask">A task that signals server stop.</param>
internal async Task ParseFormData(BufferedStreamReader reader, ServerConfig config, TimeSpan idletime, Task timeouttask, Task stoptask)
{
if (this.IsContentType("application/x-www-form-urlencoded"))
{
if (this.ContentLength != 0)
{
if (this.ContentLength > config.MaxUrlEncodedFormSize)
{
throw new HttpException(HttpStatusCode.PayloadTooLarge);
}
var enc = this.GetEncodingForContentType();
ParseQueryString(
enc.GetString(
this.ContentLength > 0
? await reader.RepeatReadAsync(this.ContentLength, idletime, timeouttask, stoptask)
: await reader.ReadUntilCrlfAsync(config.MaxRequestLineSize, config.MaxUrlEncodedFormSize, idletime, timeouttask, stoptask)
), this.Form);
}
this.Body = new LimitedBodyStream(reader, 0, idletime, timeouttask, stoptask);
}
else if (RequestUtility.IsMultipartRequest(this.ContentType) && this.ContentLength > 0 && this.ContentLength < config.MaxUrlEncodedFormSize && config.AutoParseMultipartFormData)
{
await ParseMultiPart(
async (headers, stream) =>
{
var dispositionItems = RequestUtility.SplitHeaderLine(headers["Content-Disposition"]);
if (!string.Equals(dispositionItems.FirstOrDefault().Key, "form-data", StringComparison.OrdinalIgnoreCase))
{
throw new HttpException(HttpStatusCode.BadRequest);
}
var name = RequestUtility.GetHeaderComponent(headers["Content-Disposition"], "name");
if (string.IsNullOrWhiteSpace("name"))
{
throw new HttpException(HttpStatusCode.BadRequest);
}
var filename = RequestUtility.GetHeaderComponent(headers["Content-Disposition"], "filename");
var charset = RequestUtility.GetHeaderComponent(headers["Content-Type"], "charset") ?? "ascii";
if (string.IsNullOrWhiteSpace(filename))
{
using (var sr = new StreamReader(stream, RequestUtility.GetEncodingForCharset(charset)))
{
var rtask = sr.ReadToEndAsync();
var rt = await Task.WhenAny(timeouttask, stoptask, rtask);
if (rt != rtask)
{
if (rt == stoptask)
{
throw new TaskCanceledException();
}
else
{
throw new HttpException(HttpStatusCode.RequestTimeout);
}
}
this.Form[name] = rtask.Result;
}
}
else
{
var me = new MultipartItem(headers)
{
Name = name,
Filename = filename,
Data = new MemoryStream()
};
Task rtask;
Task rt;
using (var cs = new CancellationTokenSource(idletime))
{
rtask = stream.CopyToAsync(me.Data, 8 * 1024, cs.Token);
rt = await Task.WhenAny(timeouttask, stoptask, rtask);
}
if (rt != rtask)
{
if (rt == stoptask)
{
throw new TaskCanceledException();
}
else
{
throw new HttpException(HttpStatusCode.RequestTimeout);
}
}
rtask.GetAwaiter().GetResult();
me.Data.Position = 0;
this.Files.Add(me);
}
},
reader,
config,
idletime,
timeouttask,
stoptask
);
this.Body = new LimitedBodyStream(reader, 0, idletime, timeouttask, stoptask);
}
else
{
this.Body = new LimitedBodyStream(reader, this.ContentLength, idletime, timeouttask, stoptask);
}
}
/// <summary>
/// Parses the stream items, if sent as multipart encoded
/// </summary>
/// <param name="itemparser">The parser method</param>
/// <param name="reader">The stream to read from.</param>
/// <param name="config">The server configuration.</param>
/// <param name="idletime">The maximum idle time.</param>
/// <param name="timeouttask">A task that signals request timeout.</param>
/// <param name="stoptask">A task that signals server stop.</param>
/// <returns>An awaitable task</returns>
private async Task ParseMultiPart(Func <IDictionary <string, string>, Stream, Task> itemparser, BufferedStreamReader reader, ServerConfig config, TimeSpan idletime, Task timeouttask, Task stoptask)
{
if ((this.ContentType ?? "").StartsWith("multipart/form-data", StringComparison.OrdinalIgnoreCase))
{
if (this.ContentLength > config.MaxPostSize)
{
throw new HttpException(HttpStatusCode.PayloadTooLarge);
}
var startpos = reader.Position;
var trail = new byte[2];
var parts = this.ContentType.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
var bndpart = parts.FirstOrDefault(x => x.Trim().StartsWith("boundary", StringComparison.OrdinalIgnoreCase)) ?? string.Empty;
var boundary = bndpart.Split(new char[] { '=' }, 2, StringSplitOptions.RemoveEmptyEntries).LastOrDefault();
if (string.IsNullOrWhiteSpace(boundary))
{
throw new HttpException(HttpStatusCode.BadRequest);
}
// Since we have read the headers, we have consumed the initial CRLF
// so we adjust the initial boundary reading to skip the CRLF
var itemboundary = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary);
var tmp = await reader.RepeatReadAsync(itemboundary.Length - 2, idletime, timeouttask, stoptask);
if (!Enumerable.SequenceEqual(itemboundary.Skip(2), tmp))
{
throw new HttpException(HttpStatusCode.BadRequest);
}
await reader.RepeatReadAsync(trail, 0, 2, idletime, timeouttask, stoptask);
if (trail[0] != '\r' || trail[1] != '\n')
{
throw new HttpException(HttpStatusCode.BadRequest);
}
do
{
var headers = new Dictionary <string, string>(StringComparer.OrdinalIgnoreCase).WithDefaultValue(null);
await reader.ReadHeaders(
config.MaxRequestLineSize,
config.MaxRequestHeaderSize,
idletime,
line =>
{
var components = line.Split(new char[] { ':' }, 2);
if (components.Length != 2 || string.IsNullOrWhiteSpace(components[0]))
{
throw new HttpException(HttpStatusCode.BadRequest);
}
headers[components[0].Trim()] = (components[1] ?? string.Empty).Trim();
},
timeouttask,
stoptask
);
await itemparser(headers, reader.GetDelimitedSubStream(itemboundary, idletime, timeouttask, stoptask));
await reader.RepeatReadAsync(trail, 0, 2, idletime, timeouttask, stoptask);
}while (trail[0] == '\r' && trail[1] == '\n');
if (trail[0] != '-' || trail[1] != '-')
{
throw new HttpException(HttpStatusCode.BadRequest);
}
await reader.RepeatReadAsync(trail, 0, 2, idletime, timeouttask, stoptask);
if (trail[0] != '\r' || trail[1] != '\n')
{
throw new HttpException(HttpStatusCode.BadRequest);
}
if (this.ContentLength > 0 && this.ContentLength != (reader.Position - startpos))
{
throw new HttpException(HttpStatusCode.BadRequest);
}
}
}
