private async Task<IDictionary<string, string[]>> ReadHeadersAsync(CancellationToken cancellationToken)
{
int totalSize = 0;
var accumulator = new KeyValueAccumulator<string, string>(StringComparer.OrdinalIgnoreCase);
var line = await _stream.ReadLineAsync(HeaderLengthLimit, cancellationToken);
while (!string.IsNullOrEmpty(line))
{
totalSize += line.Length;
if (totalSize > TotalHeaderSizeLimit)
{
throw new InvalidOperationException("Total header size limit exceeded: " + TotalHeaderSizeLimit);
}
int splitIndex = line.IndexOf(':');
Debug.Assert(splitIndex > 0, "Invalid header line: " + line);
if (splitIndex >= 0)
{
var name = line.Substring(0, splitIndex);
var value = line.Substring(splitIndex + 1, line.Length - splitIndex - 1).Trim();
accumulator.Append(name, value);
}
line = await _stream.ReadLineAsync(HeaderLengthLimit, cancellationToken);
}
return accumulator.GetResults();
}
/// <summary>
/// Parse a query string into its component key and value parts.
/// </summary>
/// <param name="text">The raw query string value, with or without the leading '?'.</param>
/// <returns>A collection of parsed keys and values.</returns>
public static IDictionary<string, string[]> ParseQuery(string queryString)
{
if (!string.IsNullOrEmpty(queryString) && queryString[0] == '?')
{
queryString = queryString.Substring(1);
}
var accumulator = new KeyValueAccumulator<string, string>(StringComparer.OrdinalIgnoreCase);
int textLength = queryString.Length;
int equalIndex = queryString.IndexOf('=');
if (equalIndex == -1)
{
equalIndex = textLength;
}
int scanIndex = 0;
while (scanIndex < textLength)
{
int delimiterIndex = queryString.IndexOf('&', scanIndex);
if (delimiterIndex == -1)
{
delimiterIndex = textLength;
}
if (equalIndex < delimiterIndex)
{
while (scanIndex != equalIndex && char.IsWhiteSpace(queryString[scanIndex]))
{
++scanIndex;
}
string name = queryString.Substring(scanIndex, equalIndex - scanIndex);
string value = queryString.Substring(equalIndex + 1, delimiterIndex - equalIndex - 1);
accumulator.Append(
Uri.UnescapeDataString(name.Replace('+', ' ')),
Uri.UnescapeDataString(value.Replace('+', ' ')));
equalIndex = queryString.IndexOf('=', delimiterIndex);
if (equalIndex == -1)
{
equalIndex = textLength;
}
}
scanIndex = delimiterIndex + 1;
}
return accumulator.GetResults();
}
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;
}
/// <summary>
/// Parses an HTTP form body.
/// </summary>
/// <param name="stream">The HTTP form body to parse.</param>
/// <returns>The collection containing the parsed HTTP form body.</returns>
public static async Task<IDictionary<string, string[]>> ReadFormAsync(Stream stream, Encoding encoding, CancellationToken cancellationToken = new CancellationToken())
{
var reader = new FormReader(stream, encoding);
var accumulator = new KeyValueAccumulator<string, string>(StringComparer.OrdinalIgnoreCase);
var pair = await reader.ReadNextPairAsync(cancellationToken);
while (pair.HasValue)
{
accumulator.Append(pair.Value.Key, pair.Value.Value);
pair = await reader.ReadNextPairAsync(cancellationToken);
}
return accumulator.GetResults();
}
/// <summary>
/// Parses text from an HTTP form body.
/// </summary>
/// <param name="text">The HTTP form body to parse.</param>
/// <returns>The collection containing the parsed HTTP form body.</returns>
public static IDictionary<string, string[]> ReadForm(string text)
{
var reader = new FormReader(text);
var accumulator = new KeyValueAccumulator<string, string>(StringComparer.OrdinalIgnoreCase);
var pair = reader.ReadNextPair();
while (pair.HasValue)
{
accumulator.Append(pair.Value.Key, pair.Value.Value);
pair = reader.ReadNextPair();
}
return accumulator.GetResults();
}
/// <summary>
/// Parse a query string into its component key and value parts.
/// </summary>
/// <param name="queryString">The raw query string value, with or without the leading '?'.</param>
/// <returns>A collection of parsed keys and values, null if there are no entries.</returns>
public static Dictionary<string, StringValues> ParseNullableQuery(string queryString)
{
var accumulator = new KeyValueAccumulator();
if (string.IsNullOrEmpty(queryString) || queryString == "?")
{
return null;
}
int scanIndex = 0;
if (queryString[0] == '?')
{
scanIndex = 1;
}
int textLength = queryString.Length;
int equalIndex = queryString.IndexOf('=');
if (equalIndex == -1)
{
equalIndex = textLength;
}
while (scanIndex < textLength)
{
int delimiterIndex = queryString.IndexOf('&', scanIndex);
if (delimiterIndex == -1)
{
delimiterIndex = textLength;
}
if (equalIndex < delimiterIndex)
{
while (scanIndex != equalIndex && char.IsWhiteSpace(queryString[scanIndex]))
{
++scanIndex;
}
string name = queryString.Substring(scanIndex, equalIndex - scanIndex);
string value = queryString.Substring(equalIndex + 1, delimiterIndex - equalIndex - 1);
accumulator.Append(
Uri.UnescapeDataString(name.Replace('+', ' ')),
Uri.UnescapeDataString(value.Replace('+', ' ')));
equalIndex = queryString.IndexOf('=', delimiterIndex);
if (equalIndex == -1)
{
equalIndex = textLength;
}
}
scanIndex = delimiterIndex + 1;
}
if (!accumulator.HasValues)
{
return null;
}
return accumulator.GetResults();
}
/// <summary>
/// Parses text from an HTTP form body.
/// </summary>
/// <param name="text">The HTTP form body to parse.</param>
/// <returns>The collection containing the parsed HTTP form body.</returns>
public static Dictionary<string, StringValues> ReadForm(string text)
{
var reader = new FormReader(text);
var accumulator = new KeyValueAccumulator();
var pair = reader.ReadNextPair();
while (pair.HasValue)
{
accumulator.Append(pair.Value.Key, pair.Value.Value);
pair = reader.ReadNextPair();
}
return accumulator.GetResults();
}