MoShiro/backend/fleet/tests/Fleet.Tests/IdentityAndRpcTests.cs

using System.Text.Json;
using System.Text.Json.Serialization;
using Fleet.Core;
using Fleet.Identity;
using Fleet.Rpc;

namespace Fleet.Tests;

public sealed class IdentityAndRpcTests
{
    [Fact]
    public void Signatures_VerifyOnlyForTheSameKeyPurposeAndFields()
    {
        using NodeIdentity node = NodeIdentity.Generate();
        using NodeIdentity other = NodeIdentity.Generate();
        byte[] signature = node.Sign(SignaturePurpose.Auth, "node-1", "nonce-1");

        Assert.True(NodeIdentity.Verify(node.PublicKeySpki, signature, SignaturePurpose.Auth, "node-1", "nonce-1"));
        Assert.False(NodeIdentity.Verify(other.PublicKeySpki, signature, SignaturePurpose.Auth, "node-1", "nonce-1"), "another key");
        Assert.False(NodeIdentity.Verify(node.PublicKeySpki, signature, SignaturePurpose.Peer, "node-1", "nonce-1"), "another purpose: a signature must not be reusable across scenarios");
        Assert.False(NodeIdentity.Verify(node.PublicKeySpki, signature, SignaturePurpose.Auth, "node-2", "nonce-1"), "another node id");
        Assert.False(NodeIdentity.Verify(node.PublicKeySpki, signature, SignaturePurpose.Auth, "node-1", "nonce-2"), "another nonce");
    }

    [Fact]
    public void Verify_NeverThrowsOnGarbage()
    {
        using NodeIdentity node = NodeIdentity.Generate();
        Assert.False(NodeIdentity.Verify([1, 2, 3], [4, 5, 6], SignaturePurpose.Auth, "x"));
        Assert.False(NodeIdentity.Verify(node.PublicKeySpki, [], SignaturePurpose.Auth, "x"));
        Assert.False(NodeIdentity.Verify(node.PublicKeySpki, new byte[64], SignaturePurpose.Auth, "x"));
        Assert.False(NodeIdentity.IsValidPublicKey([]));
        Assert.False(NodeIdentity.IsValidPublicKey(new byte[91]));
        Assert.True(NodeIdentity.IsValidPublicKey(node.PublicKeySpki));
    }

    [Fact]
    public void Identity_SurvivesAnExportImportRoundTrip()
    {
        using NodeIdentity original = NodeIdentity.Generate();
        using NodeIdentity restored = NodeIdentity.FromPkcs8(original.ExportPkcs8());
        Assert.Equal(original.PublicKeySpki, restored.PublicKeySpki);
        Assert.True(NodeIdentity.Verify(original.PublicKeySpki, restored.Sign("t", "a"), "t", "a"));
        Assert.Equal(32, NodeIdentity.Fingerprint(original.PublicKeySpki).Length);
    }

    [Fact]
    public void SignatureString_IsPrefixedWithPurpose()
    {
        Assert.Equal("fleet|v1|auth|a|b", SignatureString.Build("auth", "a", "b"));
    }

    [Fact]
    public void OutboxFrame_RoundTrips_AndRejectsShortFrames()
    {
        var id = Guid.CreateVersion7();
        byte[] frame = OutboxFrame.Build(16, id, [1, 2, 3]);
        Assert.True(OutboxFrame.TryParse(frame, out byte channel, out Guid parsed, out ReadOnlyMemory<byte> payload));
        Assert.Equal((byte)16, channel);
        Assert.Equal(id, parsed);
        Assert.Equal(new byte[] { 1, 2, 3 }, payload.ToArray());
        Assert.False(OutboxFrame.TryParse(new byte[OutboxFrame.HeaderBytes - 1], out _, out _, out _));
        Assert.True(OutboxFrame.TryParse(new byte[OutboxFrame.HeaderBytes], out _, out _, out ReadOnlyMemory<byte> empty));
        Assert.Equal(0, empty.Length);
    }

    [Fact]
    public async Task Router_DispatchesTypedRequests_AndReportsStructuredErrors()
    {
        var router = new RpcRouter<string>(RpcSide.Listener, TestTables.Of(TestTables.Req("test.add"), TestTables.Req("test.boom"), TestTables.Req("test.nope")))
            .On("test.add", EchoContext.Default.AddParams, EchoContext.Default.AddResult,
                (caller, p, _) => ValueTask.FromResult(p.A < 0 ? Result<AddResult>.Fail(FleetErrors.Forbidden, "negative") : Result<AddResult>.Ok(new AddResult { Sum = p.A + p.B, Caller = caller })))
            .On<AddParams, AddResult>("test.boom", EchoContext.Default.AddParams, EchoContext.Default.AddResult, (_, _, _) => throw new InvalidOperationException("secret detail"));

        RpcMessage ok = (await router.DispatchAsync("alice", Request(1, "test.add", """{"a":2,"b":3}"""), CancellationToken.None))!;
        Assert.Equal(5, ok.Result!.Value.Deserialize(EchoContext.Default.AddResult)!.Sum);
        Assert.Equal("alice", ok.Result.Value.Deserialize(EchoContext.Default.AddResult)!.Caller);

        RpcMessage denied = (await router.DispatchAsync("alice", Request(2, "test.add", """{"a":-1,"b":3}"""), CancellationToken.None))!;
        Assert.Equal("fleet_forbidden", denied.Error!.Data!.Code);
        Assert.Equal(RpcError.ApplicationError, denied.Error.Code);

        RpcMessage invalid = (await router.DispatchAsync("alice", Request(3, "test.add", """{"a":"x"}"""), CancellationToken.None))!;
        Assert.Equal(RpcError.InvalidParams, invalid.Error!.Code);

        RpcMessage unknown = (await router.DispatchAsync("alice", Request(4, "test.nope", "{}"), CancellationToken.None))!;
        Assert.Equal(RpcError.MethodNotFound, unknown.Error!.Code);
        Assert.Equal("fleet_unsupported", unknown.Error.Data!.Code);
    }

    [Fact]
    public async Task Router_HandlerExceptions_AreContained_AndNeverLeakDetails()
    {
        string? logged = null;
        var router = new RpcRouter<string>(RpcSide.Listener, TestTables.Of(TestTables.Req("test.boom")), onUnhandled: (method, ex) => logged = method + ":" + ex.Message)
            .On<AddParams, AddResult>("test.boom", EchoContext.Default.AddParams, EchoContext.Default.AddResult, (_, _, _) => throw new InvalidOperationException("secret detail"));

        RpcMessage reply = (await router.DispatchAsync("a", Request(1, "test.boom", """{"a":1,"b":1}"""), CancellationToken.None))!;
        Assert.Equal("fleet_internal", reply.Error!.Data!.Code);
        Assert.DoesNotContain("secret", reply.Error.Message);
        Assert.Equal("test.boom:secret detail", logged);
    }

    [Fact]
    public async Task Router_Notifications_ProduceNoResponse_EvenOnFailure()
    {
        int calls = 0;
        var router = new RpcRouter<string>(RpcSide.Listener, TestTables.Of(TestTables.Note("test.note"), TestTables.Note("test.unknown"))).OnNotify("test.note", EchoContext.Default.AddParams, (_, _, _) =>
        {
            calls++;
            return ValueTask.CompletedTask;
        });

        Assert.Null(await router.DispatchAsync("a", Notification("test.note", """{"a":1,"b":2}"""), CancellationToken.None));
        Assert.Null(await router.DispatchAsync("a", Notification("test.note", """{"a":"bad"}"""), CancellationToken.None));
        Assert.Null(await router.DispatchAsync("a", Notification("test.unknown", "{}"), CancellationToken.None));
        Assert.Equal(1, calls);
    }

    [Fact]
    public void Envelope_OmitsAbsentFields_AndRoundTrips()
    {
        string request = JsonSerializer.Serialize(Request(7, "x.y", """{"k":1}"""), FleetRpcContext.Default.RpcMessage);
        Assert.Equal("""{"jsonrpc":"2.0","id":7,"method":"x.y","params":{"k":1}}""", request);
        RpcMessage back = JsonSerializer.Deserialize(request, FleetRpcContext.Default.RpcMessage)!;
        Assert.True(back.IsRequest);
        Assert.False(back.IsResponse);
        Assert.True(Notification("a.b", "{}").IsNotification);

        string failure = JsonSerializer.Serialize(RpcMessage.Failure(3, new FleetError(FleetErrors.Timeout, "slow")), FleetRpcContext.Default.RpcMessage);
        Assert.Contains("\"code\":\"fleet_timeout\"", failure);
        Assert.Equal(FleetErrors.Timeout, JsonSerializer.Deserialize(failure, FleetRpcContext.Default.RpcMessage)!.Error!.ToFleetError().Code);
    }

    private static RpcMessage Request(long id, string method, string json) =>
        new() { Id = id, Method = method, Params = JsonDocument.Parse(json).RootElement.Clone() };

    private static RpcMessage Notification(string method, string json) =>
        new() { Method = method, Params = JsonDocument.Parse(json).RootElement.Clone() };
}

public sealed class AddParams
{
    [JsonPropertyName("a")]
    public int A { get; set; }

    [JsonPropertyName("b")]
    public int B { get; set; }
}

public sealed class AddResult
{
    [JsonPropertyName("sum")]
    public int Sum { get; set; }

    [JsonPropertyName("caller")]
    public string Caller { get; set; } = "";
}

[JsonSerializable(typeof(AddParams))]
[JsonSerializable(typeof(AddResult))]
internal sealed partial class EchoContext : JsonSerializerContext;