public async Task <FileModel> DownloadUrlAsync(Uri url, string userAgent = null, CancellationToken ct = default(CancellationToken))
{
if (url == null)
{
throw new ArgumentNullException(nameof(url));
}
if (string.IsNullOrEmpty(userAgent))
{
userAgent = null;
}
var fm = new FileModel {
ObjectName = url.ToObjectName(),
};
using (var httpClient = new HttpClient()) {
var ua = userAgent ?? _config.GetValue("DOWNLOAD_USER_AGENT");
var response = await httpClient.SendAsync(HttpMethod.Get, url, ua, _sizeLimit, ct : ct);
fm.Content = response.Content;
fm.ContentType = response.ContentType;
if (string.IsNullOrEmpty(fm.ContentType) && fm.Content != null && fm.Content.Length > 1)
{
var contentType = MimeTypes.GetFileType(() => fm.Content, null, fm.Content);
if (contentType != null && !string.IsNullOrWhiteSpace(contentType.Mime))
{
fm.ContentType = contentType.Mime;
}
}
}
return(fm);
}
public static string GetMimeFromStream(Stream stream)
{
if (null == stream)
{
throw new ArgumentNullException("stream");
}
long originalPosition = 0;
if (stream.CanSeek)
{
originalPosition = stream.Position;
stream.Position = 0;
}
try
{
var bufferSize = stream.Length > MaxHeaderLength ? MaxHeaderLength : stream.Length;
var buffer = new byte[bufferSize];
stream.Read(buffer, 0, MaxHeaderLength);
var fileType = MimeTypes.GetFileType(buffer);
return(fileType.Mime);
}
catch (Exception)
{
return("unknown/unknown");
}
finally
{
if (stream.CanSeek)
{
stream.Position = originalPosition;
}
}
}
