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using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Formats;
using System;
using System.Linq;
using System.Threading.Tasks;
namespace Timeline.Services
{
public interface IImageValidator
{
/// <summary>
/// Validate a image data.
/// </summary>
/// <param name="data">The data of the image. Can't be null.</param>
/// <param name="requestType">If not null, the real image format will be check against the requested format and throw if not match. If null, then do not check.</param>
/// <param name="square">If true, image must be square.</param>
/// <returns>The format.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="data"/> is null.</exception>
/// <exception cref="ImageException">Thrown when image data can't be decoded or real type does not match request type or image is not square when required.</exception>
Task<IImageFormat> Validate(byte[] data, string? requestType = null, bool square = false);
}
public class ImageValidator : IImageValidator
{
public ImageValidator()
{
}
public async Task<IImageFormat> Validate(byte[] data, string? requestType = null, bool square = false)
{
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.NotSquare, data, requestType, format.DefaultMimeType);
return format;
}
catch (UnknownImageFormatException e)
{
throw new ImageException(e, ImageException.ErrorReason.CantDecode, data, requestType, null);
}
});
return format;
}
}
}
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