fullstackhero/dotnet-starter-kit · error · UnauthorizedException

no current user

Error message

no current user

What it means

CreateChannelCommandHandler throws UnauthorizedException when the current user id resolves to Guid.Empty (compared via its string form), meaning the request had no authenticated user. A channel cannot be created without an owner/creator identity.

Solutions

1. Authenticate the request with a valid bearer token
2. Handle 401/expiry in the client by refreshing the session
3. In tests, configure ICurrentUser.GetUserId() to return a real Guid

Example fix

// before
var userId = currentUser.GetUserId().ToString();
if (userId == Guid.Empty.ToString()) throw new UnauthorizedException("no current user");
// after (robust check)
var userId = currentUser.GetUserId();
if (userId == Guid.Empty) throw new UnauthorizedException("no current user");

var userId = currentUser.GetUserId();
if (userId == Guid.Empty) throw new UnauthorizedException("no current user");

bool isAuthenticated = currentUser.GetUserId() != Guid.Empty;

try { await handler.Handle(cmd, ct); }
catch (UnauthorizedException) { /* return 401 / re-login */ }

When it happens

Trigger: Calling CreateChannel without a valid JWT, with an anonymous or expired identity, or unit-testing the handler with an ICurrentUser stub returning Guid.Empty.

Common situations: Missing Authorization header; token expired mid-session; test fixtures that never set up ICurrentUser.

Related errors

• no current user
• no current user
• no current user
• no current user
• no current user

AI-assisted analysis of fullstackhero/dotnet-starter-kit@3f2959e683 (2026-09-15). Data as JSON: /api/errors/2d3604a3af57b339. Report an issue: GitHub.

Appendix: source

Thrown at src/Modules/Chat/Modules.Chat/Features/v1/Channels/CreateChannel/CreateChannelCommandHandler.cs:21

using FSH.Modules.Chat.Contracts.v1.Commands;
using FSH.Modules.Chat.Data;
using FSH.Modules.Chat.Domain;
using Mediator;

namespace FSH.Modules.Chat.Features.v1.Channels.CreateChannel;

public sealed class CreateChannelCommandHandler(
    ChatDbContext db,
    ICurrentUser currentUser)
    : ICommandHandler<CreateChannelCommand, Guid>
{
    public async ValueTask<Guid> Handle(CreateChannelCommand cmd, CancellationToken cancellationToken)
    {
        ArgumentNullException.ThrowIfNull(cmd);
        var userId = currentUser.GetUserId().ToString();
        if (userId == Guid.Empty.ToString())
        {
            throw new UnauthorizedException("no current user");
        }

        var channel = ChatChannel.CreateChannel(cmd.Name, cmd.Description, cmd.IsPrivate, userId);
        db.Channels.Add(channel);
        await db.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
        return channel.Id;
    }
}

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