/// <summary>
/// Parses the request into files then parses the files into form fields and uploaded files.
/// </summary>
/// <param name="r">The r.</param>
/// <returns></returns>
Mapper ParseRequest(HttpWorkerRequest r)
{
// get the ID of the upload from the querystring if any
var qid = r.GetQueryString();
Guid id;
if(!Guid.TryParse(qid, out id)) {
throw new HttpParseException("Upload contains no ID.");
}
var d = new HttpUploadStatusEventArgs() {
Id = id,
StartedOn = DateTime.Now,
LastUpdated = DateTime.Now,
Message = "Beginning Upload."
};
var isIdFound = false;
var isMapFound = false;
var e = new UTF8Encoding();
// bytes for "Content-Disposition: form-data; "
var mapSig = new byte[] {
67,111,110,116,101,110,116,45,68,105,115,112,111,
115,105,116,105,111,110,58,32,102,111,114,109,
45,100,97,116,97,59,32,110,97,109,101,61,
34,109,97,112,34,13,10,13,10
};
var idSig = new byte[] {
67,111,110,116,101,110,116,45,68,105,115,112,111,115,105,116,105,
111,110,58,32,102,111,114,109,45,100,97,116,97,59,32,110,
97,109,101,61,34,105,100,34,13,10,13,10};
var m = new Mapper();
// first 46 bytes = boundary signature
const int f = 131072; // 128kb = 131072b
var l = r.GetTotalEntityBodyLength();
d.BytesTotal = l;
var p = r.GetPreloadedEntityBody();
var b = GetBoundary(p);
updateUploadStatus(ref d,l,"Uploading preloaded entity body.");
// load stream into temp file
var fst = Path.GetTempFileName();
using (var fs = new FileStream(fst, FileMode.OpenOrCreate)) {
// write preloaded body to file
Debug.Assert(p != null, "GetPreloadedEntityBody != null");
fs.Write(p, 0, p.Length);
var c = p.Length;
var q = 0;
var u = new byte[f];
updateUploadStatus(ref d, l, "Uploading.");
while (l - c > q) {
q = r.ReadEntityBody(u, 0, f);
fs.Write(u, 0, q);
c += q;
updateUploadStatus(ref d, c, "Uploading.");
}
if (l - c > 0) {
var ux = new byte[l - c];
q = r.ReadEntityBody(ux, 0, l - c);
fs.Write(ux, 0, q);
}
fs.Flush();
fs.Position = 0;
updateUploadStatus(ref d, c, "Upload Complete, Parsing upload.");
// read the entire file finding all boundaries
var s = new List<long>();
while (fs.Position < fs.Length) {
s.Add(FindPosition(fs, b, fs.Position));
}
fs.Position = 0;
// the last boundary is the eof
for (var i = 0; s.Count - 1 > i; i++) {
// indexes between boundaries - this is the new file size in bytes
if (s[i + 1] == -1) {
break;
}
var z = s[i + 1] - s[i];
// this is the size of the object between the boundaries (including current boundary)
var g = (z) < f ? z : f;
// chunk size (g) = 131072 (f) or next boundary pos - current boundary pos (z)
var n = Path.GetTempFileName();
fs.Position = s[i]; // start reading from the beginning position of the object (including boundary)
using (var a = new FileStream(n, FileMode.OpenOrCreate)) {
q = 0;
c = 0;
while (z - c > q) {
//read blocks while position - mod block size is less than end position
q = fs.Read(u, 0, (int)g);
a.Write(u, 0, q);
c += q;
}
q = fs.Read(u, 0, (int)z - c);
a.Write(u, 0, q);
a.Position = 0;
// read in form data
if (!isMapFound) {
if (FindPosition(a, mapSig, 0) > -1) {
// this is the map field
var mapBytes = new byte[a.Length - a.Position - 2]; // -2 to drop the \r\n
a.Read(mapBytes, 0, mapBytes.Length);
m.Map = e.GetString(mapBytes);
isMapFound = true;
continue;
}
}
if (!isIdFound) {
if (FindPosition(a, idSig, 0) > -1) {
// id is always 36 bytes
var idBytes = new byte[36];
a.Read(idBytes, 0, 36);
m.Id = Guid.Parse(e.GetString(idBytes));
isIdFound = true;
continue;
}
}
// this must be a binary file attachment, rip file apart
a.Position = 0;
//1) remove boundary
while (a.ReadByte() != 13) { }
a.Position++; // read past lf
//2) parse form data
var startOfFormData = a.Position;
while (a.ReadByte() != 13) { }
a.Position++; // read past lf
var endOfFormdata = a.Position;
a.Position = startOfFormData;
// create a byte array to hold form data
var formDataBuffer = new byte[endOfFormdata - startOfFormData];
a.Read(formDataBuffer, 0, formDataBuffer.Length);
var formData = e.GetString(formDataBuffer);
// form data looks like Content-Disposition: form-data; name="Authentication.CreateAccount_files_0_0"; filename="tiny.gif"
//3) parse content type
a.Position = endOfFormdata;
while (a.ReadByte() != 13) { }
a.Position++; // read past lf
var endOfContentType = a.Position - 2; // -2 so we don't capture \r\n in content type string
var contentTypeBuffer = new byte[endOfContentType - endOfFormdata];
a.Position = endOfFormdata;
a.Read(contentTypeBuffer, 0, contentTypeBuffer.Length);
var contentType = e.GetString(contentTypeBuffer);
//4) remove extra \r\n\r\n
a.Position = endOfContentType + 4;
//5) the rest is the binary file
// read it and store it in a new file
var binLength = a.Length - a.Position;
var bufferSize = f > binLength ? binLength : f;
var remainingChunckSize = binLength % bufferSize;
var bytesRead = 0L;
var tempFileName = Path.GetTempFileName();
using (var bin = new FileStream(tempFileName, FileMode.OpenOrCreate)) {
while (binLength - remainingChunckSize > bytesRead) {
var buffer = new byte[bufferSize];
bytesRead += a.Read(buffer, 0, (int)bufferSize);
bin.Write(buffer, 0, (int)bufferSize);
}
if (remainingChunckSize > 0) {
var buffer = new byte[remainingChunckSize];
a.Read(buffer, 0, (int)remainingChunckSize);
bin.Write(buffer, 0, (int)remainingChunckSize);
}
// make mapper ref
var regex = new Regex(@".*name=""([^""]+)""; filename=""([^""]+)""");
var matches = regex.Match(formData);
var methodSig = matches.Groups[1].Value;
var oFileName = matches.Groups[2].Value;
regex = new Regex(@"file:::(.*)_(\d)_files_(\d+)_(\d+)");
var matchesMetthod = regex.Match(methodSig);
var method = matchesMetthod.Groups[1].Value;
var methodInstance = matchesMetthod.Groups[2].Value;
var fileField = matchesMetthod.Groups[3].Value;
var fileNumber = matchesMetthod.Groups[4].Value;
var fm = new UploadedFile {
ContentType = contentType.Replace("Content-Type: ", ""),
// remove the words "Content-Type: " from value
Path = tempFileName,
FileNumber = int.Parse(fileNumber),
Instance = int.Parse(methodInstance),
Method = method,
FieldNumber = int.Parse(fileField),
OriginalFileName = oFileName
};
m.Files.Add(fm);
}
}
// delete temp file
File.Delete(n);
}
}
File.Delete(fst);
d.BytesTotal = 0;
d.BytesRead = 0;
d.Complete = true;
d.LastUpdated = DateTime.Now;
d.Message = "Upload Complete.";
RaiseOnUploadStatus(d);
return m;
}