/// <summary>
/// The start of an Http request
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
public void BeginRequest(object sender, EventArgs e)
{
// begin request events
var hArgs = new HttpEventArgs(HttpApplication);
RaiseOnBeginRequest(hArgs);
var results = new Dictionary<string, JsonResponse>();
var request = HttpContext.Current.Request;
var response = HttpContext.Current.Response;
// check for Json requests made to the JsonMethodUrl
// and clear the requests
if(request.FilePath.Equals(JsonMethodUrl)) {
// a request was made to the responder Url
// deserialize the request and execute the requested methods
// gather the results and add them to the results collection
// do post - Don't use the request.Form object because it is silly.
var workerRequest = (HttpWorkerRequest)HttpContext.Current.GetType().GetProperty("WorkerRequest",BindingFlags.Instance | BindingFlags.NonPublic).GetValue(HttpContext.Current, null);
var bodyLength = workerRequest.GetPreloadedEntityBodyLength();
if (bodyLength>0) {
var contentType = workerRequest.GetKnownRequestHeader(HttpWorkerRequest.HeaderContentType);
if (contentType == null) { throw new NullReferenceException("Header Content-Type cannot be empty. Acceptable post values are multipart/form-data or application/json."); }
var filePathsAndMap = ParseRequest(workerRequest);
try {
JsonResponse.InvokeJsonMethods(filePathsAndMap, ref results);
// after methods have been invoked, remove files from temp
foreach (var f in filePathsAndMap.Files) {
File.Delete(f.Path);
}
} catch(Exception ex) {
var iex = GetInnermostException(ex);
var errorResult = new JsonResponse(3, string.Format("Error invoking method. Source: {1}{0} Message: {2}{0} Stack Trace: {3}",
Environment.NewLine, iex.Source ,iex.Message, iex.StackTrace));
results.Add("Exception", errorResult);
}
} else {
// if there was no post
// do QueryString (get)
if (request.QueryString.Keys.Count == 1) {
try {
var m = new Mapper() {Map = HttpUtility.UrlDecode(request.QueryString.ToString())};
JsonResponse.InvokeJsonMethods(m, ref results);
} catch (Exception ex) {
var iex = GetInnermostException(ex);
var errorResult = new JsonResponse(3, string.Format("Error invoking method. Source: {1}{0} Message: {2}{0} Stack Trace: {3}",
Environment.NewLine, iex.Source, iex.Message, iex.StackTrace));
results.Add("Exception", errorResult);
}
}
}
}
// if one or more Json methods returned a result
// respond with that result
if (results.Count <= 0) return;
foreach(var r in results) {
var result = r.Value;
if (result.SupressResponse) continue;
response.Status = result.Status;
response.StatusCode = result.StatusCode;
response.ContentType = result.ContentType;
response.ContentEncoding = result.ContentEncoding;
response.HeaderEncoding = result.HeaderEncoding;
if(result.HttpCookie != null) {
response.AppendCookie(result.HttpCookie);
}
if(result.ContentDisposition == JsonContentDisposition.Attachment || result.ContentDisposition == JsonContentDisposition.Normal) {
if(result.ContentDisposition == JsonContentDisposition.Attachment) {
response.AddHeader("Content-Disposition", string.Format(@"attachment; filename=""{0}""", result.AttachmentFileName));
}
if(result.AttachmentContent.Length > 0) {
result.ContentLength = result.AttachmentContent.Length;
response.AddHeader("Content-Length", result.ContentLength.ToString(CultureInfo.InvariantCulture));
response.Write(result.AttachmentContent);
} else if(result.AttachmentStream.Length > 0) {
result.ContentLength = (int)result.AttachmentStream.Length;
response.AddHeader("Content-Length", result.ContentLength.ToString(CultureInfo.InvariantCulture));
var bytes = new byte[result.AttachmentStream.Length];
result.AttachmentStream.Read(bytes, 0, (int)result.AttachmentStream.Length);
response.BinaryWrite(bytes);
}
response.Flush();
HttpContext.Current.ApplicationInstance.CompleteRequest();
return;// Only one file can be output at a time.
}
}
response.Write(JsonResponse.ToJson(results));
response.Flush();
HttpContext.Current.ApplicationInstance.CompleteRequest();
}
/// <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;
}
