public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "image/JPEG";
int size = int.Parse(context.Request["size"]);
string gravatarID = context.Request["gravatar_id"];
if (size != 16 && size != 50 && size != 80)
{
throw new ArgumentException("The size must be either 16, 50 or 80");
}
string gravatarFileName = String.Format("{0}_{1}.jpg", gravatarID, size);
string cachedGravatarFolderPath = Path.Combine(context.Request.PhysicalApplicationPath, @"Static\Images\Cache\Gravatars\");
string defaultGravatarFolderPath = Path.Combine(context.Request.PhysicalApplicationPath, @"Static\Images\Cache\DefaultGravatars\");
string cachedGravatarFilePath = Path.Combine(cachedGravatarFolderPath, gravatarFileName);
string gravatarCopyPath = cachedGravatarFilePath.Replace(".jpg", ".copy.jpg");
string gravatarToReturnPath = cachedGravatarFilePath;
if (File.Exists(gravatarToReturnPath) && (File.GetLastWriteTime(gravatarToReturnPath).AddMinutes(GRAVATAR_CACHE_DURATION_IN_MINUTES) < DateTime.Now))
{
if (!File.Exists(gravatarCopyPath) && new FileInfo(cachedGravatarFilePath).Length > 0)
{
File.Copy(cachedGravatarFilePath, gravatarCopyPath, true); //create a copy for tempory serving
}
try {
File.Delete(cachedGravatarFilePath);
} catch (System.IO.IOException) { }
gravatarToReturnPath = gravatarCopyPath;
}
if (File.Exists(gravatarToReturnPath))
{
context.Response.Cache.SetExpires(DateTime.Now.AddHours(24));
context.Response.Cache.SetValidUntilExpires(true);
context.Response.Cache.SetCacheability(HttpCacheability.Public);
}
else
{
if (File.Exists(gravatarCopyPath))
{
gravatarToReturnPath = gravatarCopyPath;
}
else
{
gravatarToReturnPath = Path.Combine(defaultGravatarFolderPath, String.Format("gravatar_{0}.jpg", size));
}
//Asynchronously download the gravatars to the cache
GravatarHelper.DownloadGravatar_Begin(gravatarID, size, cachedGravatarFilePath);
}
try {
context.Response.WriteFile(gravatarToReturnPath);
} catch (System.IO.IOException) { //The file may be locked
try {
context.Response.WriteFile(gravatarCopyPath);
} catch (System.IO.IOException) {
context.Response.WriteFile(Path.Combine(defaultGravatarFolderPath, String.Format("gravatar_{0}.jpg", size)));
}
}
}