public async Task ReadSmallFormAsyncPipe()
{
var pipe = new Pipe();
var bytes = Encoding.UTF8.GetBytes("foo=bar&baz=boo");
for (var i = 0; i < 1000; i++)
{
pipe.Writer.Write(bytes);
pipe.Writer.Complete();
var formReader = new FormPipeReader(pipe.Reader);
await formReader.ReadFormAsync();
pipe.Reader.Complete();
pipe.Reset();
}
}
public async Task ResetPipeWorks()
{
// Same test that is in the benchmark
var pipe = new Pipe();
var bytes = Encoding.UTF8.GetBytes("foo=bar&baz=boo");
for (var i = 0; i < 1000; i++)
{
pipe.Writer.Write(bytes);
pipe.Writer.Complete();
var formReader = new FormPipeReader(pipe.Reader);
await formReader.ReadFormAsync();
pipe.Reader.Complete();
pipe.Reset();
}
}
internal virtual Task <Dictionary <string, StringValues> > ReadFormAsync(FormPipeReader reader)
{
return(reader.ReadFormAsync());
}
private async Task <IFormCollection> InnerReadFormAsync(CancellationToken cancellationToken)
{
if (!HasFormContentType)
{
throw new InvalidOperationException("Incorrect Content-Type: " + _request.ContentType);
}
cancellationToken.ThrowIfCancellationRequested();
if (_request.ContentLength == 0)
{
return(FormCollection.Empty);
}
if (_options.BufferBody)
{
_request.EnableRewind(_options.MemoryBufferThreshold, _options.BufferBodyLengthLimit);
}
FormCollection formFields = null;
FormFileCollection files = null;
// Some of these code paths use StreamReader which does not support cancellation tokens.
using (cancellationToken.Register((state) => ((HttpContext)state).Abort(), _request.HttpContext)) {
var contentType = ContentType;
// Check the content-type
if (HasApplicationFormContentType(contentType))
{
var encoding = FilterEncoding(contentType.Encoding);
var formReader = new FormPipeReader(_request.BodyReader, encoding)
{
ValueCountLimit = _options.ValueCountLimit,
KeyLengthLimit = _options.KeyLengthLimit,
ValueLengthLimit = _options.ValueLengthLimit,
};
formFields = new FormCollection(await formReader.ReadFormAsync(cancellationToken));
}
else if (HasMultipartFormContentType(contentType))
{
var formAccumulator = new KeyValueAccumulator();
var boundary = GetBoundary(contentType, _options.MultipartBoundaryLengthLimit);
var multipartReader = new MultipartReader(boundary, _request.Body)
{
HeadersCountLimit = _options.MultipartHeadersCountLimit,
HeadersLengthLimit = _options.MultipartHeadersLengthLimit,
BodyLengthLimit = _options.MultipartBodyLengthLimit,
};
var section = await multipartReader.ReadNextSectionAsync(cancellationToken);
while (section != null)
{
// Parse the content disposition here and pass it further to avoid reparsings
if (!ContentDispositionHeaderValue.TryParse(section.ContentDisposition, out var contentDisposition))
{
throw new InvalidDataException("Form section has invalid Content-Disposition value: " + section.ContentDisposition);
}
if (contentDisposition.IsFileDisposition())
{
var fileSection = new FileMultipartSection(section, contentDisposition);
// Enable buffering for the file if not already done for the full body
section.EnableRewind(
_request.HttpContext.Response.RegisterForDispose,
_options.MemoryBufferThreshold, _options.MultipartBodyLengthLimit);
// Find the end
await section.Body.DrainAsync(cancellationToken);
var name = fileSection.Name;
var fileName = fileSection.FileName;
FormFile file;
if (section.BaseStreamOffset.HasValue)
{
// Relative reference to buffered request body
file = new FormFile(_request.Body, section.BaseStreamOffset.GetValueOrDefault(), section.Body.Length, name, fileName);
}
else
{
// Individually buffered file body
file = new FormFile(section.Body, 0, section.Body.Length, name, fileName);
}
file.Headers = new HeaderDictionary(section.Headers);
if (files == null)
{
files = new FormFileCollection();
}
if (files.Count >= _options.ValueCountLimit)
{
throw new InvalidDataException($"Form value count limit {_options.ValueCountLimit} exceeded.");
}
files.Add(file);
}
else if (contentDisposition.IsFormDisposition())
{
var formDataSection = new FormMultipartSection(section, contentDisposition);
// Content-Disposition: form-data; name="key"
//
// value
// Do not limit the key name length here because the multipart headers length limit is already in effect.
var key = formDataSection.Name;
var value = await formDataSection.GetValueAsync();
formAccumulator.Append(key, value);
if (formAccumulator.ValueCount > _options.ValueCountLimit)
{
throw new InvalidDataException($"Form value count limit {_options.ValueCountLimit} exceeded.");
}
}
else
{
System.Diagnostics.Debug.Assert(false, "Unrecognized content-disposition for this section: " + section.ContentDisposition);
}
section = await multipartReader.ReadNextSectionAsync(cancellationToken);
}
if (formAccumulator.HasValues)
{
formFields = new FormCollection(formAccumulator.GetResults(), files);
}
}
}
// Rewind so later readers don't have to.
if (_request.Body.CanSeek)
{
_request.Body.Seek(0, SeekOrigin.Begin);
}
if (formFields != null)
{
Form = formFields;
}
else if (files != null)
{
Form = new FormCollection(null, files);
}
else
{
Form = FormCollection.Empty;
}
return(Form);
}