public static IEnumerable <Upload> AsFileDescriptors(this IEnumerable <Base64FilePayload> files, IContentTypeTestUtility contentTypeTestUtility)
{
var number = 0U;
foreach (var rawFile in files)
{
string contentType;
var data = rawFile.RawData.AsSpan();
ReadOnlyMemory <byte> byteArr;
if (data.StartsWith(Base64FilePayload.DataToken.AsSpan(), StringComparison.InvariantCultureIgnoreCase))
{
(contentType, byteArr) = Base64Parser.Parse(data, rawFile.Name);
}
else
{
byteArr = Base64ConvertHelper.ConvertToBytes(data);
contentType = string.Empty;
}
if (string.IsNullOrEmpty(contentType))
{
contentType = contentTypeTestUtility.DetectContentType(byteArr.Slice(0, 4).Span);
}
if (contentTypeTestUtility.IsAllowed(contentType))
{
yield return(new Upload(
id: Guid.NewGuid(),
previewId: Guid.NewGuid(),
num: number++,
name: rawFile.Name,
contentType: contentType,
streamAdapter: new ByteaStreamAdapter(byteArr)));
}
}
}