Can't get claims from JWT token with ASP.NET Core

Question

I\'m trying to do a really simple implementation of JWT bearer authentication with ASP.NET Core. I return a response from a controller a bit like this:

    var i         


        

Answer 1

With this solution, you can access the User.Identity and its claims in controllers when you're using JWT tokens:

Step 1: create a JwtTokenMiddleware:

public static class JwtTokenMiddleware
{
    public static IApplicationBuilder UseJwtTokenMiddleware(
      this IApplicationBuilder app,
      string schema = "Bearer")
    {
        return app.Use((async (ctx, next) =>
        {
            IIdentity identity = ctx.User.Identity;
            if ((identity != null ? (!identity.IsAuthenticated ? 1 : 0) : 1) != 0)
            {
                AuthenticateResult authenticateResult = await ctx.AuthenticateAsync(schema);
                if (authenticateResult.Succeeded && authenticateResult.Principal != null)
                    ctx.User = authenticateResult.Principal;
            }
            await next();
        }));
    }
}

Step 2: use it in Startup.cs:

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    app.UseAuthentication();
    app.UseJwtTokenMiddleware();
}