thalos-service/tests/Thalos.Service.Application.UnitTests/HmacIdentitySessionTokenCodecTests.cs

using BuildingBlock.Identity.Contracts.Conventions;
using Thalos.Service.Application.Secrets;
using Thalos.Service.Application.Sessions;

namespace Thalos.Service.Application.UnitTests;

public class HmacIdentitySessionTokenCodecTests
{
    [Fact]
    public void EncodeAndTryDecode_WhenTokenValid_RoundTripsDescriptor()
    {
        var codec = new HmacIdentitySessionTokenCodec(new FakeSecretMaterialProvider());
        var descriptor = new IdentitySessionDescriptor(
            "user-9",
            "tenant-9",
            IdentityAuthProvider.AzureAd,
            DateTimeOffset.UtcNow.AddMinutes(5));

        var token = codec.Encode(descriptor);
        var ok = codec.TryDecode(token, out var decoded);

        Assert.True(ok);
        Assert.Equal("user-9", decoded.SubjectId);
        Assert.Equal("tenant-9", decoded.TenantId);
        Assert.Equal(IdentityAuthProvider.AzureAd, decoded.Provider);
    }

    [Fact]
    public void TryDecode_WhenTokenTampered_ReturnsFalse()
    {
        var codec = new HmacIdentitySessionTokenCodec(new FakeSecretMaterialProvider());
        var descriptor = new IdentitySessionDescriptor(
            "user-9",
            "tenant-9",
            IdentityAuthProvider.InternalJwt,
            DateTimeOffset.UtcNow.AddMinutes(5));

        var token = codec.Encode(descriptor) + "tamper";

        var ok = codec.TryDecode(token, out _);

        Assert.False(ok);
    }

    private sealed class FakeSecretMaterialProvider : IIdentitySecretMaterialProvider
    {
        public string GetSecret(string secretKey) => "unit-test-secret";
    }
}