public override bool StreamOutput(int tabId, string cacheKey, HttpContext context)
{
bool Succes = false;
try
{
string attribFileName = OpenFileProvider.GetAttribFileName(tabId, cacheKey);
string cachedOutputFileName = OpenFileProvider.GetCachedOutputFileName(tabId, cacheKey);
if (File.Exists(attribFileName) && File.Exists(cachedOutputFileName) && !IsFileExpired(attribFileName))
{
var Response = context.Response;
DateTime lastWriteTimeUtc = File.GetLastWriteTimeUtc(cachedOutputFileName);
Response.Cache.SetLastModified(lastWriteTimeUtc);
bool send304 = false;
HttpRequest request = context.Request;
string ifModifiedSinceHeader = request.Headers["If-Modified-Since"];
string etag = request.Headers["If-None-Match"];
if (ifModifiedSinceHeader != null && etag != null)
{
etag = etag.Trim('"');
try
{
DateTime utcIfModifiedSince = DateTime.Parse(ifModifiedSinceHeader);
if (lastWriteTimeUtc <= utcIfModifiedSince && etag == cacheKey)
{
Response.StatusCode = 304;
Response.StatusDescription = "Not Modified";
Response.SuppressContent = true;
//Response.ClearContent();
Response.AddHeader("Content-Length", "0");
send304 = true;
}
}
catch
{
DnnLog.Error("Ignore If-Modified-Since header, invalid format: " + ifModifiedSinceHeader);
}
}
if (!send304)
{
context.Response.TransmitFile(cachedOutputFileName);
}
Succes = true;
}
else
{
FileSystemUtils.DeleteFileWithWait(attribFileName, 100, 200);
FileSystemUtils.DeleteFileWithWait(cachedOutputFileName, 100, 200);
Succes = false;
}
}
catch (Exception ex)
{
Succes = false;
DnnLog.Error(ex);
}
return(Succes);
}
public override bool IsExpired(int tabId, string cacheKey, out DateTime LastModified)
{
LastModified = Null.NullDate;
string attribFileName = OpenFileProvider.GetAttribFileName(tabId, cacheKey);
string cachedOutputFileName = OpenFileProvider.GetCachedOutputFileName(tabId, cacheKey);
if (File.Exists(attribFileName) && File.Exists(cachedOutputFileName) && !IsFileExpired(attribFileName))
{
LastModified = File.GetLastWriteTimeUtc(cachedOutputFileName);
return(false);
}
return(true);
}
