jellyfin-plugin-floatplane/Jellyfin.Plugin.Floatplane.Tests/ProxySignatureTests.cs

using Jellyfin.Plugin.Floatplane.Api;
using Xunit;

namespace Jellyfin.Plugin.Floatplane.Tests;

public class ProxySignatureTests
{
    [Fact]
    public void Create_Verify_roundtrip()
    {
        var sig = ProxySignature.Create("hls", "post1", "video1", "1080");

        Assert.Equal(64, sig.Length);
        Assert.True(ProxySignature.Verify(sig, "hls", "post1", "video1", "1080"));
        Assert.Equal(sig, ProxySignature.Create("hls", "post1", "video1", "1080"));
    }

    [Fact]
    public void Tampered_parts_or_signature_fail()
    {
        var sig = ProxySignature.Create("hls", "post1", "video1", "1080");

        Assert.False(ProxySignature.Verify(sig, "hls", "post1", "video1", "2160"));
        Assert.False(ProxySignature.Verify(sig, "mp4", "post1", "video1", "1080"));
        Assert.False(ProxySignature.Verify(sig[..^1] + (sig[^1] == 'a' ? 'b' : 'a'), "hls", "post1", "video1", "1080"));
        Assert.False(ProxySignature.Verify(null, "hls", "post1", "video1", "1080"));
        Assert.False(ProxySignature.Verify(string.Empty, "hls", "post1", "video1", "1080"));
    }

    [Theory]
    [InlineData("https://www.floatplane.com/api/video/watchKey?token=abc")]
    [InlineData("https://cdn-vod-drm2.floatplane.com/Videos/x/1080.mp4/chunk.m3u8?token=a.b.c&x=y%20z")]
    [InlineData("å ä ö")]
    public void EncodeUrl_DecodeUrl_roundtrip(string value)
    {
        var encoded = ProxySignature.EncodeUrl(value);

        Assert.DoesNotContain('+', encoded);
        Assert.DoesNotContain('/', encoded);
        Assert.DoesNotContain('=', encoded);
        Assert.Equal(value, ProxySignature.DecodeUrl(encoded));
    }

    [Fact]
    public void DecodeUrl_rejects_garbage()
    {
        Assert.Null(ProxySignature.DecodeUrl(null));
        Assert.Null(ProxySignature.DecodeUrl(string.Empty));
        Assert.Null(ProxySignature.DecodeUrl("!!!not base64!!!"));
    }
}