private async Task RouteRequest(HttpListenerContext httpContext)
{
// Auto-Redirect HTTP to HTTPS if 'HttpsState' is 'Forced'.
if (Context.Https == HttpsStates.Forced && !string.Equals("https", httpContext.Request.Url.Scheme, StringComparison.OrdinalIgnoreCase))
{
RedirectToSecure(httpContext);
return;
}
var path = httpContext.Request.Url.AbsolutePath.TrimEnd('/');
var root = Context.ListenerPath.TrimEnd('/');
if (path.StartsWith(root))
{
path = path.Substring(root.Length);
}
if (path.Length == 0)
{
path = "/";
}
HttpHandlerResult result = null;
var tokenSource = new CancellationTokenSource();
try {
result = await GetRouteResult(httpContext, path, tokenSource.Token)
?? HttpHandlerResult.NotFound().SetText($"No content found matching path '{path}'!");
await result.ApplyAsync(httpContext, tokenSource.Token);
}
catch (Exception) {
tokenSource.Cancel();
throw;
}
finally {
try {
result?.Dispose();
}
catch {}
tokenSource.Dispose();
}
}
private HttpHandlerResult ProcessContent(HttpListenerContext context, string localPath, ContentDirectory directory)
{
if (Path.DirectorySeparatorChar != '/')
{
localPath = localPath.Replace('/', Path.DirectorySeparatorChar);
}
var localFilename = Path.Combine(directory.DirectoryPath, localPath);
// Ensure requested content is within the specified directory
// IE, prevent relative path hacking
var fullRootPath = Path.GetFullPath(directory.DirectoryPath);
var fullLocalFilename = Path.GetFullPath(localFilename);
if (!fullLocalFilename.StartsWith(fullRootPath))
{
return(HttpHandlerResult.NotFound()
.SetText($"Requested file is outisde of the content directory! [{fullLocalFilename}]"));
}
var localFile = new FileInfo(fullLocalFilename);
// Ensure file exists
if (!localFile.Exists)
{
return(HttpHandlerResult.NotFound()
.SetText($"File not found! [{fullLocalFilename}]"));
}
// HTTP Caching - Last-Modified
var ifModifiedSince = context.Request.Headers.Get("If-Modified-Since");
if (DateTime.TryParse(ifModifiedSince, out var ifModifiedSinceValue))
{
if (localFile.LastWriteTime.TrimMilliseconds() <= ifModifiedSinceValue)
{
return(HttpHandlerResult.Status(HttpStatusCode.NotModified));
}
}
return(HttpHandlerResult.File(Context, fullLocalFilename)
.SetHeader("Last-Modified", localFile.LastWriteTimeUtc.ToString("r")));
}
