コード例 #1
0
        public async Task<IFormCollection> ReadFormAsync(CancellationToken cancellationToken)
        {
            if (Form != null)
            {
                return Form;
            }

            if (!HasFormContentType)
            {
                throw new InvalidOperationException("Incorrect Content-Type: " + _request.ContentType);
            }

            cancellationToken.ThrowIfCancellationRequested();

            _request.EnableRewind();

            IDictionary<string, StringValues> formFields = null;
            var files = new FormFileCollection();

            // Some of these code paths use StreamReader which does not support cancellation tokens.
            using (cancellationToken.Register(_request.HttpContext.Abort))
            {
                var contentType = ContentType;
                // Check the content-type
                if (HasApplicationFormContentType(contentType))
                {
                    var encoding = FilterEncoding(contentType.Encoding);
                    formFields = await FormReader.ReadFormAsync(_request.Body, encoding, cancellationToken);
                }
                else if (HasMultipartFormContentType(contentType))
                {
                    var formAccumulator = new KeyValueAccumulator();

                    var boundary = GetBoundary(contentType);
                    var multipartReader = new MultipartReader(boundary, _request.Body);
                    var section = await multipartReader.ReadNextSectionAsync(cancellationToken);
                    while (section != null)
                    {
                        var headers = new HeaderDictionary(section.Headers);
                        ContentDispositionHeaderValue contentDisposition;
                        ContentDispositionHeaderValue.TryParse(headers[HeaderNames.ContentDisposition], out contentDisposition);
                        if (HasFileContentDisposition(contentDisposition))
                        {
                            // Find the end
                            await section.Body.DrainAsync(cancellationToken);

                            var file = new FormFile(_request.Body, section.BaseStreamOffset.Value, section.Body.Length)
                            {
                                Headers = headers,
                            };
                            files.Add(file);
                        }
                        else if (HasFormDataContentDisposition(contentDisposition))
                        {
                            // Content-Disposition: form-data; name="key"
                            //
                            // value

                            var key = HeaderUtilities.RemoveQuotes(contentDisposition.Name);
                            MediaTypeHeaderValue mediaType;
                            MediaTypeHeaderValue.TryParse(headers[HeaderNames.ContentType], out mediaType);
                            var encoding = FilterEncoding(mediaType?.Encoding);
                            using (var reader = new StreamReader(section.Body, encoding, detectEncodingFromByteOrderMarks: true, bufferSize: 1024, leaveOpen: true))
                            {
                                var value = await reader.ReadToEndAsync();
                                formAccumulator.Append(key, value);
                            }
                        }
                        else
                        {
                            System.Diagnostics.Debug.Assert(false, "Unrecognized content-disposition for this section: " + headers[HeaderNames.ContentDisposition]);
                        }

                        section = await multipartReader.ReadNextSectionAsync(cancellationToken);
                    }

                    formFields = formAccumulator.GetResults();
                }
            }

            // Rewind so later readers don't have to.
            _request.Body.Seek(0, SeekOrigin.Begin);

            Form = new FormCollection(formFields, files);
            return Form;
        }
コード例 #2
0
        public async Task <IFormCollection> ReadFormAsync(CancellationToken cancellationToken)
        {
            if (Form != null)
            {
                return(Form);
            }

            if (!HasFormContentType)
            {
                throw new InvalidOperationException("Incorrect Content-Type: " + _request.ContentType);
            }

            cancellationToken.ThrowIfCancellationRequested();

            _request.EnableRewind();

            IDictionary <string, StringValues> formFields = null;
            var files = new FormFileCollection();

            // Some of these code paths use StreamReader which does not support cancellation tokens.
            using (cancellationToken.Register(_request.HttpContext.Abort))
            {
                var contentType = ContentType;
                // Check the content-type
                if (HasApplicationFormContentType(contentType))
                {
                    var encoding = FilterEncoding(contentType.Encoding);
                    formFields = await FormReader.ReadFormAsync(_request.Body, encoding, cancellationToken);
                }
                else if (HasMultipartFormContentType(contentType))
                {
                    var formAccumulator = new KeyValueAccumulator();

                    var boundary        = GetBoundary(contentType);
                    var multipartReader = new MultipartReader(boundary, _request.Body);
                    var section         = await multipartReader.ReadNextSectionAsync(cancellationToken);

                    while (section != null)
                    {
                        var headers = new HeaderDictionary(section.Headers);
                        ContentDispositionHeaderValue contentDisposition;
                        ContentDispositionHeaderValue.TryParse(headers[HeaderNames.ContentDisposition], out contentDisposition);
                        if (HasFileContentDisposition(contentDisposition))
                        {
                            // Find the end
                            await section.Body.DrainAsync(cancellationToken);

                            var file = new FormFile(_request.Body, section.BaseStreamOffset.Value, section.Body.Length)
                            {
                                Headers = headers,
                            };
                            files.Add(file);
                        }
                        else if (HasFormDataContentDisposition(contentDisposition))
                        {
                            // Content-Disposition: form-data; name="key"
                            //
                            // value

                            var key = HeaderUtilities.RemoveQuotes(contentDisposition.Name);
                            MediaTypeHeaderValue mediaType;
                            MediaTypeHeaderValue.TryParse(headers[HeaderNames.ContentType], out mediaType);
                            var encoding = FilterEncoding(mediaType?.Encoding);
                            using (var reader = new StreamReader(section.Body, encoding, detectEncodingFromByteOrderMarks: true, bufferSize: 1024, leaveOpen: true))
                            {
                                var value = await reader.ReadToEndAsync();

                                formAccumulator.Append(key, value);
                            }
                        }
                        else
                        {
                            System.Diagnostics.Debug.Assert(false, "Unrecognized content-disposition for this section: " + headers[HeaderNames.ContentDisposition]);
                        }

                        section = await multipartReader.ReadNextSectionAsync(cancellationToken);
                    }

                    formFields = formAccumulator.GetResults();
                }
            }

            // Rewind so later readers don't have to.
            _request.Body.Seek(0, SeekOrigin.Begin);

            Form = new FormCollection(formFields, files);
            return(Form);
        }