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using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Formats;
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace Timeline.Services.Imaging
{
public class ImageService : IImageService
{
public async Task<IImageFormat> DetectFormatAsync(byte[] data, CancellationToken cancellationToken = default)
{
if (data == null)
throw new ArgumentNullException(nameof(data));
var format = await Task.Run(() =>
{
var format = Image.DetectFormat(data);
if (format is null)
{
throw new ImageException(ImageException.ErrorReason.CantDecode, data, null, null, null);
}
return format;
}, cancellationToken);
return format;
}
public async Task<IImageFormat> ValidateAsync(byte[] data, string? requestType = null, bool square = false, CancellationToken cancellationToken = default)
{
if (data == null)
throw new ArgumentNullException(nameof(data));
var format = await Task.Run(() =>
{
try
{
using var image = Image.Load(data, out IImageFormat format);
if (requestType != null && !format.MimeTypes.Contains(requestType))
throw new ImageException(ImageException.ErrorReason.UnmatchedFormat, data, requestType, format.DefaultMimeType);
if (square && image.Width != image.Height)
throw new ImageException(ImageException.ErrorReason.BadSize, data, requestType, format.DefaultMimeType);
return format;
}
catch (UnknownImageFormatException e)
{
throw new ImageException(ImageException.ErrorReason.CantDecode, data, requestType, null, null, e);
}
}, cancellationToken);
return format;
}
}
}
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