/// <summary>
/// Loops through all services and returns the first matching file.
/// </summary>
/// <param name="context">Context used to locate and return files</param>
public virtual void GetFile(FileContext context)
{
foreach (var fileService in _fileServices)
{
fileService.GetFile(context);
if (context.LastModifiedAtUtc > DateTime.MinValue)
return;
}
}
/// <summary>
/// Handle an message
/// </summary>
/// <param name="context">Context unique for this handler instance</param>
/// <param name="message">Message to process</param>
/// <remarks>
/// All messages that can't be handled MUST be send up the chain using <see cref="IPipelineHandlerContext.SendUpstream"/>.
/// </remarks>
public void HandleUpstream(IPipelineHandlerContext context, IPipelineMessage message)
{
var msg = message as ReceivedHttpRequest;
if (msg == null)
{
context.SendUpstream(message);
return;
}
var ifModifiedSince = DateTime.MinValue;
var header = msg.HttpRequest.Headers["If-Modified-Since"];
if (header != null)
{
ifModifiedSince = DateTime.Parse(header.Value).ToUniversalTime();
// Allow for file systems with subsecond time stamps
ifModifiedSince = new DateTime(ifModifiedSince.Year, ifModifiedSince.Month, ifModifiedSince.Day,
ifModifiedSince.Hour, ifModifiedSince.Minute, ifModifiedSince.Second,
ifModifiedSince.Kind);
}
var fileContext = new FileContext(msg.HttpRequest, ifModifiedSince);
_fileService.GetFile(fileContext);
if (fileContext.LastModifiedAtUtc > DateTime.MinValue)
{
var response = msg.HttpRequest.CreateResponse(HttpStatusCode.OK, "File found");
var filename = msg.HttpRequest.Uri.Segments[msg.HttpRequest.Uri.Segments.Length - 1];
response.ContentType = _mimeTypeProvider.Get(filename);
if (fileContext.FileStream == null)
{
response.StatusDescription = "File have not changed since " + fileContext.LastModifiedAtUtc;
response.StatusCode = (int) HttpStatusCode.NotModified;
}
else
{
response.AddHeader("Last-Modified", fileContext.LastModifiedAtUtc.ToString("R"));
response.Body = fileContext.FileStream;
}
context.SendDownstream(new SendHttpResponse(msg.HttpRequest, response));
return;
}
context.SendUpstream(message);
}