/// <summary>
/// Process Ajax gateway upload request posted by the jQuery upload client component
/// </summary>
/// <param name="objHostContext"></param>
/// <param name="strAction">The only supported action is "ULPost", posted by the jQuery upload control as Ajax gateway request</param>
/// <returns></returns>
protected override IGatewayHandler ProcessGatewayRequest(Gizmox.WebGUI.Hosting.HostContext objHostContext, string strAction)
{
if (strAction == WGAttributes.UploadControlPost)
{
// The response will be plain text.
objHostContext.Response.ContentType = "text/plain";
try
{
// The byte range of current chunk being posted/uploaded
string strContentRange = (string)objHostContext.Request.Headers["Content-Range"];
// Current implementation as chunked uploads only support one file
if ((strContentRange != null) && (objHostContext.Request.Files.Count > 1))
{
throw new NotSupportedException("Chunked file uploads only supported for one file at a time");
}
// Prepare for list of uploaded file results - since chunked uploads are being used, there will be only one file in list
List <UploadFileResult> objUploadResults = new List <UploadFileResult>();
// Prepare serializer for json serialization of response to Ajax request
JavaScriptSerializer objJS = new JavaScriptSerializer();
// Get the posted file handle. Only one file, since we are using chunked uploads
HttpPostedFile objPostedFile = objHostContext.HttpContext.Request.Files[0] as HttpPostedFile;
string strUploadedFileName = string.Empty;
// Get filename without path
string[] files = objPostedFile.FileName.Split(new char[] { '\\' });
strUploadedFileName = files[files.Length - 1];
#region On first chunk of a new file, build temporary filename
if (strContentRange != null)
{
if (this.isFirstRange(strContentRange))
{
mstrChunkedFileName = System.IO.Path.Combine(this.UploadTempFilePath, Guid.NewGuid().ToString() + "_" + strUploadedFileName);
}
if (mstrChunkedFileName == null)
{
throw new NotSupportedException("Chunked file upload missing initial chunk");
}
}
#endregion
string savedFileName;
if (strContentRange == null)
{
#region If no range, file uploaded in one chunk, so save it
savedFileName = System.IO.Path.Combine(this.UploadTempFilePath, Guid.NewGuid().ToString() + "_" + strUploadedFileName);
objPostedFile.SaveAs(savedFileName);
#endregion
}
else
{
#region If range, save chunk. Assume sequential chunks
savedFileName = mstrChunkedFileName;
using (System.IO.FileStream fs = new System.IO.FileStream(savedFileName, System.IO.FileMode.Append, System.IO.FileAccess.Write))
{
byte[] buffer = new byte[UploadBufferSize];
long l = objPostedFile.InputStream.Read(buffer, 0, UploadBufferSize);
while (l > 0)
{
fs.Write(buffer, 0, (int)l);
l = objPostedFile.InputStream.Read(buffer, 0, UploadBufferSize);
}
fs.Flush();
fs.Close();
}
#endregion
}
// Prepare results for uploaded file request
UploadFileResult objResult = new UploadFileResult(strUploadedFileName, objPostedFile.ContentLength, objPostedFile.ContentType, savedFileName);
objUploadResults.Add(objResult);
#region Fire chunk completed event
if (this.UploadChunkRequestCompletedHandler != null)
{
UploadChunkRequestResult objChunkResult = new UploadChunkRequestResult(
strUploadedFileName,
(long)objPostedFile.ContentLength,
objPostedFile.ContentType,
savedFileName,
strContentRange);
this.UploadChunkRequestCompletedHandler(this, new UploadChunkRequestEventArgs(objChunkResult));
}
#endregion
// Prepare response as json serialized results object
object jsonObj = objJS.Serialize(objUploadResults.ToArray());
objHostContext.Response.Write(jsonObj.ToString());
return(null);
}
catch (Exception ex)
{
#region Unhandled error detected. Throw exception, or call error handler
if (this.UploadErrorHandler != null)
{
this.UploadErrorHandler(this, new UploadErrorEventArgs(ex.Message, ex));
}
else
{
throw;
}
return(null);
#endregion
}
}
// Call base, if action doesn't belong here.
return(base.ProcessGatewayRequest(objHostContext, strAction));
}
/// <summary>
/// Initializes the arguments with UploadFileResults
/// </summary>
/// <param name="objResult"></param>
public UploadChunkRequestEventArgs(UploadChunkRequestResult objResult)
{
mobjResult = objResult;
}