private bool LookupFileInfo(
PathString subPath,
string contentType,
out StaticFileInfo staticFileInfo)
{
var fileInfo = _fileProvider.GetFileInfo(subPath.Value);
if (fileInfo.Exists)
{
var length = fileInfo.Length;
DateTimeOffset last = fileInfo.LastModified;
// Truncate to the second.
var lastModified = new DateTimeOffset(
last.Year, last.Month, last.Day, last.Hour,
last.Minute, last.Second, last.Offset)
.ToUniversalTime();
long etagHash = lastModified.ToFileTime() ^ length;
var etag = new EntityTagHeaderValue('\"' + Convert.ToString(etagHash, 16) + '\"');
staticFileInfo = new StaticFileInfo(fileInfo, etag, contentType);
return(true);
}
staticFileInfo = default;
return(false);
}
private async Task SendAsync(HttpContext context, StaticFileInfo fileInfo)
{
SetCompressionMode(context);
context.Response.StatusCode = 200;
context.Response.ContentLength = fileInfo.File.Length;
context.Response.ContentType = fileInfo.ContentType;
ResponseHeaders headers = context.Response.GetTypedHeaders();
headers.LastModified = fileInfo.File.LastModified;
headers.ETag = fileInfo.EntityTagHeader;
headers.Headers[HeaderNames.AcceptRanges] = "bytes";
try
{
await context.Response.SendFileAsync(
fileInfo.File,
0,
fileInfo.File.Length,
context.RequestAborted);
}
catch (OperationCanceledException)
{
context.Abort();
}
}
