public static Task<FormData> ParseMultipart(Stream stream, string boundary) {
if (stream == null) {
throw new ArgumentNullException("stream");
}
if (boundary == null) {
throw new ArgumentNullException("boundary");
}
if (boundary.Length == 0) {
throw new ArgumentException("Boundary cannot be empty", "boundary");
}
var form = new FormData();
boundary = "--" + boundary;
var boundaryBytes = Encoding.UTF8.GetBytes("\r\n" + boundary);
string currentLine = stream.ReadLine(Encoding.UTF8);
if (currentLine != boundary) {
form.IsValid = false;
return TaskHelper.Completed(form);
}
while (true) {
currentLine = stream.ReadLine(Encoding.UTF8);
// parse ContentDisposition line
var match = ContentDispositionFormDataRegex.Match(currentLine);
if (!match.Success) {
form.IsValid = false;
return TaskHelper.Completed(form);
}
string fieldName = match.Groups[1].Value;
string fileName = match.Groups[2].Success ? match.Groups[3].Value : null;
if (fileName != null) {
if (!ParseMultipartFile(stream, form, fieldName, fileName, boundaryBytes)) {
form.IsValid = false;
return TaskHelper.Completed(form);
}
}
else {
if (!ParseMultipartField(stream, form, fieldName, boundaryBytes)) {
form.IsValid = false;
return TaskHelper.Completed(form);
}
}
// check end or next
currentLine = stream.ReadLine(Encoding.UTF8);
// --boundary-- end
if (currentLine == "--") {
break;
}
// --boundary between
if (currentLine != string.Empty) {
form.IsValid = false;
return TaskHelper.Completed(form);
}
}
return TaskHelper.Completed(form);
}
public static Task <FormData> ParseMultipart(Stream stream, string boundary)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (boundary == null)
{
throw new ArgumentNullException("boundary");
}
if (boundary.Length == 0)
{
throw new ArgumentException("Boundary cannot be empty", "boundary");
}
var form = new FormData();
boundary = "--" + boundary;
var boundaryBytes = Encoding.UTF8.GetBytes("\r\n" + boundary);
string currentLine = stream.ReadLine(Encoding.UTF8);
if (currentLine != boundary)
{
form.IsValid = false;
return(TaskHelper.Completed(form));
}
while (true)
{
currentLine = stream.ReadLine(Encoding.UTF8);
// parse ContentDisposition line
var match = ContentDispositionFormDataRegex.Match(currentLine);
if (!match.Success)
{
form.IsValid = false;
return(TaskHelper.Completed(form));
}
string fieldName = match.Groups[1].Value;
string fileName = match.Groups[2].Success ? match.Groups[3].Value : null;
if (fileName != null)
{
if (!ParseMultipartFile(stream, form, fieldName, fileName, boundaryBytes))
{
form.IsValid = false;
return(TaskHelper.Completed(form));
}
}
else
{
if (!ParseMultipartField(stream, form, fieldName, boundaryBytes))
{
form.IsValid = false;
return(TaskHelper.Completed(form));
}
}
// check end or next
currentLine = stream.ReadLine(Encoding.UTF8);
// --boundary-- end
if (currentLine == "--")
{
break;
}
// --boundary between
if (currentLine != string.Empty)
{
form.IsValid = false;
return(TaskHelper.Completed(form));
}
}
return(TaskHelper.Completed(form));
}
private static bool ParseMultipartField(Stream stream, FormData form, string fieldName, byte[] boundaryBytes)
{
string contentType = null;
string headerLine;
Match match;
while ((headerLine = stream.ReadLine(Encoding.UTF8)) != string.Empty)
{
// parse 'Content-" headers
match = ContentTypeFormDataRegex.Match(headerLine);
if (match.Success)
{
// nested: Content-Type: multipart/mixed; boundary=BbC04y
contentType = match.Groups[1].Value.Trim();
if (match.Groups[2].Success)
{
string fileBoundary = match.Groups[4].Value;
byte[] fileBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + fileBoundary);
byte[] temp;
if (!stream.ReadTo(fileBoundaryBytes, out temp))
{
return(false);
}
if (stream.ReadLine(Encoding.UTF8) != string.Empty)
{
return(false);
}
bool moreFiles = true;
while (moreFiles)
{
string line = stream.ReadLine(Encoding.UTF8);
match = ContentDispositionFileRegex.Match(line);
if (!match.Success)
{
return(false);
}
string filename = match.Groups[1].Value;
if (!ParseMultipartFile(stream, form, fieldName, filename, fileBoundaryBytes))
{
return(false);
}
line = stream.ReadLine(Encoding.UTF8);
if (line == "--")
{
moreFiles = false;
}
else if (line != string.Empty)
{
return(false);
}
}
// NB: CrLf already ripped here
var boundaryNoCrLf = new byte[boundaryBytes.Length - 2];
Array.Copy(boundaryBytes, 2, boundaryNoCrLf, 0, boundaryBytes.Length - 2);
if (!stream.ReadTo(boundaryNoCrLf, out temp))
{
return(false);
}
if (temp.Length != 0)
{
return(false);
}
return(true);
}
}
}
if (contentType == null)
{
contentType = "text/plain";
}
byte[] value;
if (!stream.ReadTo(boundaryBytes, out value))
{
return(false);
}
// handle charset: content-type: text/plain;charset=windows-1250
match = CharsetRegex.Match(contentType);
Encoding encoding = match.Success ? Encoding.GetEncoding(match.Groups[2].Value) : Encoding.UTF8;
form[fieldName] = encoding.GetString(value);
return(true);
}
private static bool ParseMultipartFile(Stream stream, FormData form, string fieldName, string fileName, byte[] boundaryBytes) {
string contentType = null;
string headerLine;
while ((headerLine = stream.ReadLine(Encoding.UTF8)) != string.Empty) {
// parse 'Content-" headers
var match = ContentTypeFileRegex.Match(headerLine);
if (match.Success) {
contentType = match.Groups[1].Value.Trim();
}
}
if (contentType == null) {
//todo: infer from file type (extension)
contentType = "application/octet-stream";
}
byte[] data;
if (!stream.ReadTo(boundaryBytes, out data)) {
return false;
}
form.Files.Add(new PostedFile(fieldName, fileName, data, contentType));
return true;
}
private static bool ParseMultipartField(Stream stream, FormData form, string fieldName, byte[] boundaryBytes) {
string contentType = null;
string headerLine;
Match match;
while ((headerLine = stream.ReadLine(Encoding.UTF8)) != string.Empty) {
// parse 'Content-" headers
match = ContentTypeFormDataRegex.Match(headerLine);
if (match.Success) {
// nested: Content-Type: multipart/mixed; boundary=BbC04y
contentType = match.Groups[1].Value.Trim();
if (match.Groups[2].Success) {
string fileBoundary = match.Groups[4].Value;
byte[] fileBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + fileBoundary);
byte[] temp;
if (!stream.ReadTo(fileBoundaryBytes, out temp)) {
return false;
}
if (stream.ReadLine(Encoding.UTF8) != string.Empty) {
return false;
}
bool moreFiles = true;
while (moreFiles) {
string line = stream.ReadLine(Encoding.UTF8);
match = ContentDispositionFileRegex.Match(line);
if (!match.Success) {
return false;
}
string filename = match.Groups[1].Value;
if (!ParseMultipartFile(stream, form, fieldName, filename, fileBoundaryBytes)) {
return false;
}
line = stream.ReadLine(Encoding.UTF8);
if (line == "--") {
moreFiles = false;
}
else if (line != string.Empty) {
return false;
}
}
// NB: CrLf already ripped here
var boundaryNoCrLf = new byte[boundaryBytes.Length - 2];
Array.Copy(boundaryBytes, 2, boundaryNoCrLf, 0, boundaryBytes.Length - 2);
if (!stream.ReadTo(boundaryNoCrLf, out temp)) {
return false;
}
if (temp.Length != 0) {
return false;
}
return true;
}
}
}
if (contentType == null) {
contentType = "text/plain";
}
byte[] value;
if (!stream.ReadTo(boundaryBytes, out value)) {
return false;
}
// handle charset: content-type: text/plain;charset=windows-1250
match = CharsetRegex.Match(contentType);
Encoding encoding = match.Success ? Encoding.GetEncoding(match.Groups[2].Value) : Encoding.UTF8;
form[fieldName] = encoding.GetString(value);
return true;
}
/// <summary>
/// Builds a FormData from the specified input stream,
/// which is assumed to be in x-www-form-urlencoded format.
/// </summary>
/// <param name="stream">the input stream</param>
/// <returns>a populated FormData object</returns>
public static Task<FormData> ParseUrlEncoded(Stream stream) {
var form = new FormData();
string input = stream.ReadAll();
var pairs = input.Split(UrlSplitTokens, StringSplitOptions.RemoveEmptyEntries);
foreach (var pair in pairs) {
var nameValue = pair.Split('=');
form[nameValue[0]] = UrlHelper.Decode(nameValue[1]);
}
return TaskHelper.Completed(form);
}
public void HandleMultipartData()
{
string httpContent = @"--AaB03x
Content-Disposition: form-data; name=""SingleFile""; filename=""single.txt""
Content-Type: text/plain
Just a text file.
--AaB03x
Content-Disposition: form-data; name=""Test""
Pass
--AaB03x
Content-Disposition: form-data; name=""MultipleFiles""
Content-Type: multipart/mixed; boundary=BbC04y
--BbC04y
Content-Disposition: file; filename=""file1.txt""
Content-Type: text/plain
...contents of file1.txt...
--BbC04y
Content-Disposition: file; filename=""file2.gif""
Content-Type: image/gif
Content-Transfer-Encoding: binary
...contents of file2.gif...
--BbC04y--
--AaB03x--";
var host = new TestHostAndServer(FormsMiddleware.ParseFormData, Pipeline.ReturnDone);
var request = TestRequest.Post("/")
.WithContentType(FormData.GetMultipartContentType("AaB03x"))
.WithContent(httpContent);
IContext context = host.Process(request);
var form = context.Request.FormData;
form.IsValid.ShouldBeTrue();
form.Files.Count.ShouldEqual(3);
var file = form.Files[0];
file.FieldName.ShouldEqual("SingleFile");
file.FileName.ShouldEqual("single.txt");
file.ContentType.ShouldEqual("text/plain");
file.ContentLength.ShouldEqual(17);
file.InputStream.ReadAll()
.ShouldEqual("Just a text file.");
file = form.Files[1];
file.FieldName.ShouldEqual("MultipleFiles");
file.FileName.ShouldEqual("file1.txt");
file.ContentType.ShouldEqual("text/plain");
file.ContentLength.ShouldEqual(27);
file.InputStream.ReadAll()
.ShouldEqual("...contents of file1.txt...");
file = form.Files[2];
file.FieldName.ShouldEqual("MultipleFiles");
file.FileName.ShouldEqual("file2.gif");
file.ContentType.ShouldEqual("image/gif");
file.ContentLength.ShouldEqual(27);
file.InputStream.ReadAll()
.ShouldEqual("...contents of file2.gif...");
form.Values.Count.ShouldEqual(1);
form["Test"].ShouldEqual("Pass");
}
