void IHttpHandler.ProcessRequest(HttpContext context)
{
BlobHandlerInfo handler = BlobHandlerInfo.Current;
if (handler == null)
{
throw new HttpException(404, String.Empty);
}
if (handler.Mode == BlobMode.Upload)
{
RenderUploader(context, handler, handler.SaveFile(context));
}
else
{
string tempFileName = Path.GetTempFileName();
Stream stream = File.Create(tempFileName);
handler.LoadFile(stream);
CopyToOutput(context, stream, handler);
stream.Close();
File.Delete(tempFileName);
}
if (handler.Mode != BlobMode.Thumbnail)
{
context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
}
}
private void RenderUploader(HttpContext context, BlobHandlerInfo handler, bool uploadSuccess)
{
HtmlTextWriter writer = new HtmlTextWriter(context.Response.Output);
writer.WriteLine("<!DOCTYPE html PUBLIC \\\"-//W3C//DTD XHTML 1.0 Transitional//EN\\\" \\\"http://www.w3." +
"org/TR/xhtml1/DTD/xhtml1-transitional.dtd\\\">");
writer.AddAttribute("xmlns", "http://www.w3.org/1999/xhtml");
writer.RenderBeginTag(HtmlTextWriterTag.Html);
// head
writer.RenderBeginTag(HtmlTextWriterTag.Head);
writer.RenderBeginTag(HtmlTextWriterTag.Title);
writer.Write("Uploader");
writer.RenderEndTag();
writer.AddAttribute(HtmlTextWriterAttribute.Type, "text/javascript");
writer.RenderBeginTag(HtmlTextWriterTag.Script);
writer.WriteLine(@"
function ShowUploadControls() {
document.getElementById('UploadControlsPanel').style.display ='block';
document.getElementById('StartUploadPanel').style.display = 'none';
document.getElementById('FileUpload').focus();
}
function Owner() {
var m = window.location.href.match(/owner=(.+?)&/);
return m ? parent.$find(m[1]) : null;
}
function StartUpload(msg) {
if (msg && !window.confirm(msg)) return;
if (parent && parent.window.Web) {
var m = window.location.href.match(/&index=(\d+)$/);
if (m) Owner()._showUploadProgress(m[1]);
}
document.forms[0].submit();
}
function UploadSuccess(key, message) {
if (parent && parent.window.Web) {
parent.Web.DataView.showMessage(message);
Owner().refresh();
}
else
alert('Success');
}");
writer.RenderEndTag();
writer.AddAttribute(HtmlTextWriterAttribute.Type, "text/css");
writer.RenderBeginTag(HtmlTextWriterTag.Style);
writer.WriteLine("body{font-family:tahoma;font-size:8.5pt;margin:4px;background-color:white;}");
writer.WriteLine("input{font-family:tahoma;font-size:8.5pt;}");
writer.WriteLine("input.FileUpload{padding:3px}");
writer.RenderEndTag();
writer.RenderEndTag();
// body
string message = null;
if (uploadSuccess)
{
if (HttpContext.Current.Request.Files[0].ContentLength > 0)
{
message = String.Format("<b>Confirmation:</b> {0} has been uploaded successfully. <b>It may take up to {1}" +
" minutes for the thumbnail to reflect the uploaded content.</b>", handler.Text.ToLower(), Blob.ThumbnailCacheTimeout);
}
else
{
message = String.Format("<b>Confirmation:</b> {0} has been cleared.", handler.Text.ToLower());
}
}
else
if (!(String.IsNullOrEmpty(handler.Error)))
{
message = String.Format("<b>Error:</b> failed to upload {0}. {1}", handler.Text.ToLower(), handler.Error.Replace("\'", "\\\'"));
}
if (!(String.IsNullOrEmpty(message)))
{
writer.AddAttribute("onload", String.Format("UploadSuccess(\'{0}={1}\', \'{2}\')", handler.Key, handler.Value.Replace("u|", "t|"), message));
}
writer.RenderBeginTag(HtmlTextWriterTag.Body);
// form
writer.AddAttribute(HtmlTextWriterAttribute.Name, "form1");
writer.AddAttribute("method", "post");
writer.AddAttribute("action", context.Request.RawUrl);
writer.AddAttribute(HtmlTextWriterAttribute.Id, "form1");
writer.AddAttribute("enctype", "multipart/form-data");
writer.RenderBeginTag(HtmlTextWriterTag.Form);
writer.RenderBeginTag(HtmlTextWriterTag.Div);
// begin "start upload" controls
writer.AddAttribute(HtmlTextWriterAttribute.Id, "StartUploadPanel");
writer.RenderBeginTag(HtmlTextWriterTag.Div);
writer.Write("Click ");
writer.AddAttribute(HtmlTextWriterAttribute.Href, "#");
writer.AddAttribute(HtmlTextWriterAttribute.Onclick, "ShowUploadControls();return false");
writer.RenderBeginTag(HtmlTextWriterTag.A);
writer.Write("here");
writer.RenderEndTag();
writer.Write(" to upload or clear {0} file.", handler.Text.ToLower());
// end of "start upload" controls
writer.RenderEndTag();
// begin "upload controls"
writer.AddAttribute(HtmlTextWriterAttribute.Id, "UploadControlsPanel");
writer.AddAttribute(HtmlTextWriterAttribute.Style, "display:none");
writer.RenderBeginTag(HtmlTextWriterTag.Div);
// "FileUpload" input
writer.AddAttribute(HtmlTextWriterAttribute.Type, "File");
writer.AddAttribute(HtmlTextWriterAttribute.Name, "FileUpload");
writer.AddAttribute(HtmlTextWriterAttribute.Id, "FileUpload");
writer.AddAttribute(HtmlTextWriterAttribute.Class, "FileUpload");
writer.AddAttribute(HtmlTextWriterAttribute.Onchange, "StartUpload()");
writer.RenderBeginTag(HtmlTextWriterTag.Input);
writer.RenderEndTag();
// "FileClear" input
writer.AddAttribute(HtmlTextWriterAttribute.Type, "button");
writer.AddAttribute(HtmlTextWriterAttribute.Id, "FileClear");
writer.AddAttribute(HtmlTextWriterAttribute.Class, "FileClear");
writer.AddAttribute(HtmlTextWriterAttribute.Onclick, "StartUpload(\'Clear?\')");
writer.AddAttribute(HtmlTextWriterAttribute.Value, "Clear");
writer.RenderBeginTag(HtmlTextWriterTag.Input);
writer.RenderEndTag();
// end of "upload controls"
writer.RenderEndTag();
// close "div"
writer.RenderEndTag();
// close "form"
writer.RenderEndTag();
// close "body"
writer.RenderEndTag();
// close "html"
writer.RenderEndTag();
writer.Close();
}
private void CopyToOutput(HttpContext context, Stream stream, BlobHandlerInfo handler)
{
int offset = 0;
stream.Position = offset;
byte[] buffer = null;
Image img = null;
// attempt to auto-detect content type as an image
if (String.IsNullOrEmpty(handler.ContentType) && (stream.Length > 0))
{
try
{
img = Image.FromStream(stream);
}
catch (Exception)
{
try
{
// Correction for Northwind database image format
offset = 78;
stream.Position = offset;
buffer = new byte[(stream.Length - offset)];
stream.Read(buffer, 0, buffer.Length);
img = Image.FromStream(new MemoryStream(buffer, 0, buffer.Length));
}
catch (Exception ex)
{
context.Trace.Write(ex.ToString());
}
}
}
// send an original or a thumbnail to the output
if (handler.Mode == BlobMode.Thumbnail)
{
// draw a thumbnail
Bitmap thumbnail = new Bitmap(92, 71);
Graphics g = Graphics.FromImage(thumbnail);
Rectangle r = new Rectangle(0, 0, 91, 70);
g.FillRectangle(Brushes.White, r);
g.DrawRectangle(Pens.Silver, r);
double thumbnailAspect = (Convert.ToDouble(r.Height) / Convert.ToDouble(r.Width));
if (img != null)
{
r.Inflate(-2, -2);
if (img.Width > img.Height)
{
r.Height = Convert.ToInt32((Convert.ToDouble(r.Width) * thumbnailAspect));
r.Width = Convert.ToInt32((Convert.ToDouble(r.Height)
* (Convert.ToDouble(img.Width) / Convert.ToDouble(img.Height))));
}
else
if (img.Height > img.Width)
{
r.Width = Convert.ToInt32((Convert.ToDouble(r.Height) * thumbnailAspect));
r.Height = Convert.ToInt32((Convert.ToDouble(r.Width)
* (Convert.ToDouble(img.Height) / Convert.ToDouble(img.Width))));
}
else
{
r.Width = Convert.ToInt32((Convert.ToDouble(img.Height) * thumbnailAspect));
r.Height = r.Width;
}
double aspect = (Convert.ToDouble((thumbnail.Width - 4)) / r.Width);
if (r.Width <= r.Height)
{
aspect = (Convert.ToDouble((thumbnail.Height - 4)) / r.Height);
}
if (aspect > 1)
{
aspect = 1;
}
r.Width = Convert.ToInt32((Convert.ToDouble(r.Width) * aspect));
r.Height = Convert.ToInt32((Convert.ToDouble(r.Height) * aspect));
r.Location = new Point(((thumbnail.Width - r.Width)
/ 2), ((thumbnail.Height - r.Height)
/ 2));
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.DrawImage(img, r);
}
else
{
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
Font f = new Font("Arial", ((float)(7.5)));
g.DrawString(handler.Text, f, Brushes.Black, r);
}
// produce thumbnail data
MemoryStream ts = new MemoryStream();
thumbnail.Save(ts, ImageFormat.Png);
ts.Flush();
ts.Position = 0;
byte[] td = new byte[ts.Length];
ts.Read(td, 0, td.Length);
ts.Close();
// Send thumbnail to the output
context.Response.AddHeader("Content-Length", td.Length.ToString());
context.Response.ContentType = "image/png";
context.Response.OutputStream.Write(td, 0, td.Length);
if (img == null)
{
context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
}
else
{
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.Cache.SetExpires(DateTime.Now.AddMinutes(Blob.ThumbnailCacheTimeout));
}
}
else
{
string contentType = handler.ContentType;
if (img != null)
{
contentType = ImageFormats[img.RawFormat.Guid];
}
if (String.IsNullOrEmpty(contentType))
{
contentType = "application/octet-stream";
}
string fileName = handler.FileName;
if (String.IsNullOrEmpty(fileName))
{
fileName = String.Format("{0}{1}.{2}", handler.Key, handler.Reference, contentType.Substring((contentType.IndexOf("/") + 1)));
}
context.Response.ContentType = contentType;
//context.Response.AddHeader("Content-Disposition", ("filename=" + fileName));
//context.Response.AppendHeader("content-disposition", "attachment; filename=" + fileName);
context.Response.AppendHeader("content-disposition", "filename=" + fileName);
//context.Response.AddHeader("Content-Length", stream.Length.ToString());
//context.Response.AddHeader("content-length", stream.Length.ToString());
stream.Position = offset;
buffer = new byte[(1024 * 32)];
int bytesRead = stream.Read(buffer, 0, buffer.Length);
while (bytesRead > 0)
{
context.Response.OutputStream.Write(buffer, 0, bytesRead);
offset = (offset + bytesRead);
bytesRead = stream.Read(buffer, 0, buffer.Length);
}
}
}