.NET でダイナミック画像圧縮 API を作成する方法

using Aspose.Imaging;

Metered license = new Metered();
license.SetMeteredKey("<your public key>", "<your private key>");
Console.WriteLine("Metered license configured successfully.");

using Microsoft.AspNetCore.Mvc;
using Aspose.Imaging;
using Aspose.Imaging.ImageOptions;

[ApiController]
[Route("api/[controller]")]
public class ImageCompressionController : ControllerBase
{
    [HttpPost("compress")]
    public IActionResult CompressImage(IFormFile file, [FromQuery] string format = "jpeg", [FromQuery] int quality = 75)
    {
        if (file == null || file.Length == 0)
        {
            return BadRequest("No file uploaded.");
        }

        try
        {
            using (var stream = file.OpenReadStream())
            using (var image = Image.Load(stream))
            {
                ImageOptionsBase options = GetCompressionOptions(format, quality);
                string outputPath = Path.Combine("wwwroot/compressed", file.FileName);

                image.Save(outputPath, options);

                return Ok($"Compressed image saved at: {outputPath}");
            }
        }
        catch (Exception ex)
        {
            return StatusCode(500, $"An error occurred: {ex.Message}");
        }
    }

    private ImageOptionsBase GetCompressionOptions(string format, int quality)
    {
        return format.ToLower() switch
        {
            "jpeg" => new JpegOptions { Quality = quality },
            "png" => new PngOptions { CompressionLevel = 9 },
            "webp" => new WebPOptions { Lossless = false, Quality = quality },
            _ => throw new NotSupportedException($"Format {format} is not supported.")
        };
    }
}