private static void SendFile(HttpContext context, Rock.CMS.File file)
{
context.Response.ContentType = file.MimeType;
context.Response.AddHeader("content-disposition", "inline;filename=" + file.FileName);
context.Response.BinaryWrite(file.Data);
context.Response.Flush();
}
private static bool FetchFromCache(Rock.CMS.File file, string physFilePath)
{
bool cached = false;
if (System.IO.File.Exists(physFilePath) && file.CreatedDateTime < System.IO.File.GetCreationTime(physFilePath))
{
try
{
using (BinaryReader binReader = new BinaryReader(System.IO.File.Open(physFilePath, FileMode.Open, FileAccess.Read, System.IO.FileShare.Read)))
{
file.Data = System.IO.File.ReadAllBytes(physFilePath);
}
cached = true;
}
catch { /* ok, so we'll just skip using the cache, but TODO: log this */ }
}
return(cached);
}
private static void ResizeAndCache(HttpContext context, Rock.CMS.File file, string physFilePath)
{
ResizeSettings settings = new ResizeSettings(context.Request.QueryString);
MemoryStream resizedStream = new MemoryStream();
ImageBuilder.Current.Build(new MemoryStream(file.Data), resizedStream, settings);
file.Data = resizedStream.GetBuffer();
// now cache the file for later use
try
{
using (BinaryWriter binWriter = new BinaryWriter(System.IO.File.Open(physFilePath, FileMode.Create)))
{
binWriter.Write(file.Data);
}
}
catch { /* do nothing, not critical if this fails, although TODO: log */ }
}
public void ProcessRequest(HttpContext context)
{
if (context.Request.QueryString == null || context.Request.QueryString.Count == 0)
{
return;
}
context.Response.Clear();
FileService fileService = new FileService();
string anID = context.Request.QueryString[0];
int id;
try
{
// Fetch the file...
Rock.CMS.File file = (int.TryParse(anID, out id)) ? fileService.Get(id) : fileService.GetByEncryptedKey(anID);
// is it cached?
string cacheName = Uri.EscapeDataString(context.Request.Url.Query);
string physFilePath = context.Request.MapPath(string.Format("~/Cache/{0}", cacheName));
bool cached = FetchFromCache(file, physFilePath);
// Image resizing requested?
if (!cached && WantsImageResizing(context))
{
ResizeAndCache(context, file, physFilePath);
}
// Post process
SendFile(context, file);
}
catch (Exception ex)
{
// TODO: log this error
context.Response.StatusDescription = ex.Message;
context.Response.StatusCode = 500;
context.Response.End();
}
}
