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Validate mimeType in ImageContentBlock.FromBytes and AudioContentBlock.FromBytes (#1321)

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
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Copilot 2026-02-20 03:47:08 +00:00 • committed by GitHub
commit 539481f999
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2 changed files with 26 additions and 2 deletions
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10
src/ModelContextProtocol.Core/Protocol/ContentBlock.cs
View file

@ -425,9 +425,12 @@ public sealed class ImageContentBlock : ContentBlock
/// <remarks>
/// This method stores the provided bytes as <see cref="DecodedData"/> and encodes them to base64 UTF-8 bytes for <see cref="Data"/>.
/// </remarks>
/// <exception cref="InvalidOperationException"></exception>
/// <exception cref="ArgumentNullException"><paramref name="mimeType"/> is <see langword="null"/>.</exception>
/// <exception cref="ArgumentException"><paramref name="mimeType"/> is empty or composed entirely of whitespace.</exception>
public static ImageContentBlock FromBytes(ReadOnlyMemory<byte> bytes, string mimeType)
{
Throw.IfNullOrWhiteSpace(mimeType);
ReadOnlyMemory<byte> data = EncodingUtilities.EncodeToBase64Utf8(bytes);
return new()
@ -510,9 +513,12 @@ public sealed class AudioContentBlock : ContentBlock
/// <remarks>
/// This method stores the provided bytes as <see cref="DecodedData"/> and encodes them to base64 UTF-8 bytes for <see cref="Data"/>.
/// </remarks>
/// <exception cref="InvalidOperationException"></exception>
/// <exception cref="ArgumentNullException"><paramref name="mimeType"/> is <see langword="null"/>.</exception>
/// <exception cref="ArgumentException"><paramref name="mimeType"/> is empty or composed entirely of whitespace.</exception>
public static AudioContentBlock FromBytes(ReadOnlyMemory<byte> bytes, string mimeType)
{
Throw.IfNullOrWhiteSpace(mimeType);
ReadOnlyMemory<byte> data = EncodingUtilities.EncodeToBase64Utf8(bytes);
return new()

18
tests/ModelContextProtocol.Tests/Protocol/ContentBlockTests.cs
View file

@ -272,4 +272,22 @@ public class ContentBlockTests
Assert.Equal("Paris", result.Input.GetProperty("city").GetString());
Assert.Equal("metric", result.Input.GetProperty("units").GetString());
}
[Theory]
[InlineData(null)]
[InlineData("")]
[InlineData(" ")]
public void ImageContentBlock_FromBytes_ThrowsForNullOrWhiteSpaceMimeType(string? mimeType)
{
Assert.ThrowsAny<ArgumentException>(() => ImageContentBlock.FromBytes((byte[])[1, 2, 3], mimeType!));
}
[Theory]
[InlineData(null)]
[InlineData("")]
[InlineData(" ")]
public void AudioContentBlock_FromBytes_ThrowsForNullOrWhiteSpaceMimeType(string? mimeType)
{
Assert.ThrowsAny<ArgumentException>(() => AudioContentBlock.FromBytes((byte[])[1, 2, 3], mimeType!));
}
}