72 lines
2.4 KiB
C#
72 lines
2.4 KiB
C#
 
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using NetVips;
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using PrivaPub.Domain.Media;
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namespace PrivaPub.Tests.Domain
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{
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public class MediaProcessingTests
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{
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static byte[] JpegWithMetadata(int width, int height)
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{
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using var image = (Image.Black(width, height, bands: 3) + new double[] { 200, 40, 90 }).Cast(Enums.BandFormat.Uchar);
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using var tagged = image.Mutate(m =>
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{
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m.Set(GValue.GStrType, "exif-ifd0-ImageDescription", "where I live");
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m.Set(GValue.GStrType, "exif-ifd0-Artist", "Alice Smith");
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m.Set(GValue.GStrType, "exif-ifd2-UserComment", "at home");
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m.Set(GValue.BlobType, "xmp-data", System.Text.Encoding.UTF8.GetBytes("<x:xmpmeta xmlns:x='adobe:ns:meta/'><secret/></x:xmpmeta>"));
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});
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return tagged.WriteToBuffer(".jpg");
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}
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[Fact]
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public void Uploaded_images_lose_every_kind_of_metadata()
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{
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var input = JpegWithMetadata(800, 600);
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using (var original = Image.NewFromBuffer(input))
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Assert.Contains("exif-data", original.GetFields());
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var processed = MediaService.ProcessImage(input, 4096, 640, animated: false);
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using var output = Image.NewFromBuffer(processed.Bytes);
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var fields = output.GetFields();
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Assert.DoesNotContain("exif-data", fields);
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Assert.DoesNotContain("xmp-data", fields);
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Assert.DoesNotContain("iptc-data", fields);
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Assert.DoesNotContain(fields, f => f.StartsWith("exif-ifd"));
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Assert.Equal((800, 600), (processed.Width, processed.Height));
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Assert.Equal("image/jpeg", processed.ContentType);
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using var preview = Image.NewFromBuffer(processed.Preview);
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Assert.Equal(640, Math.Max(preview.Width, preview.Height));
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Assert.DoesNotContain("exif-data", preview.GetFields());
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}
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[Fact]
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public void Large_images_are_capped()
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{
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var processed = MediaService.ProcessImage(JpegWithMetadata(5000, 2500), 4096, 640, animated: false);
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Assert.Equal((4096, 2048), (processed.Width, processed.Height));
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}
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[Fact]
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public void A_blurhash_is_well_formed()
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{
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var processed = MediaService.ProcessImage(JpegWithMetadata(64, 64), 4096, 640, animated: false);
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Assert.Equal(28, processed.Blurhash.Length);
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Assert.Equal('L', processed.Blurhash[0]);
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}
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[Fact]
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public void A_white_image_encodes_white_as_its_average()
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{
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var pixels = Enumerable.Range(0, 16 * 16).SelectMany(_ => new byte[] { 255, 255, 255 }).ToArray();
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var hash = Blurhash.Encode(pixels, 16, 16);
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Assert.Equal(28, hash.Length);
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Assert.Equal("TSUA", hash[2..6]);
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}
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}
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}
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