public void should_build_etag()
{
var fileModifiedAtUtc = DateTime.Parse("2002/2/13 0:00:00");
var etag = _tagBuilder.EntityTagBuild(fileModifiedAtUtc, 4166);
Assert.Equal("\"1c1b4216127d046\"", etag.Tag.ToString());
}
public async Task <IActionResult> DownloadFile(string slug, [FromQuery] bool?download)
{
var fileRecord = _fileRepo.All().FirstOrDefault(f => f.Slug.ToLower() == slug.ToLower());
if (fileRecord == null)
{
return(NotFound());
}
var file = await _fileSystem.GetFileAsync(fileRecord.StoragePath);
if (file == null)
{
return(NotFound());
}
var shouldDownload = download.HasValue && download.Value;
var entityTag = _tagbuilder.EntityTagBuild(fileRecord.ModifiedAtUtc, file.GetSize());
if (!shouldDownload)
{
var modifiedSinceHeader = Request.Headers["If-Modified-Since"];
var modifiedSinceUtc = DateTimeOffset.MinValue;
var formatValid = modifiedSinceHeader.Any() &&
DateTimeOffset.TryParseExact(modifiedSinceHeader.ToString(), "R", CultureInfo.InvariantCulture, DateTimeStyles.None, out modifiedSinceUtc);
if (formatValid && modifiedSinceUtc.UtcDateTime >= fileRecord.ModifiedAtUtc)
{
return(new StatusCodeResult(304));
}
var etagHeader = Request.Headers["If-None-Match"];
if (etagHeader.Any() && entityTag.Tag.Value.Trim('\"').Equals(etagHeader.ToString().Trim('\"')))
{
return(new StatusCodeResult(304));
}
}
var buffered = new BufferedStream(await file.OpenReadAsync(), 8 * 1024);
if (!_contentTypeProvider.TryGetContentType(fileRecord.OriginalName, out var contentType))
{
contentType = "application/octet-stream";
}
return(new FileStreamResult(buffered, contentType)
{
FileDownloadName = shouldDownload ? fileRecord.OriginalName : null,
EntityTag = entityTag,
LastModified = new DateTimeOffset(fileRecord.ModifiedAtUtc, TimeSpan.Zero)
});
}