Simple configurable middleware for ApiKey authentication

Adding authentication

    // Add service
    services
        .AddAuthentication()
        .AddApiKeyAuth(options =>
        {
            if(!Configuration.GetChildren().Any(x => x.Key == "ApiAuthentication"))
                throw new InvalidOperationException($"Expected 'ApiAuthentication' section.");

            var keys = Configuration.GetSection("ApiAuthentication:Keys")
                .AsEnumerable()
                .Where(x => x.Value != null)
                .Select(x => x.Value);

            options.ValidApiKeys = keys;
        });

    // Or .AddApiKeyAuth("here_is_apikey", "here_is_apikey2" ...)
    // Or .AddApiKeyAuth(new [] { "apikey1", "apikey2" })

    // Configuration (this comes from net core 2.x+, not from this library.)
    app.UseAuthentication();

Using on authorization

    [Authorize(AuthenticationSchemes = ApiKey.Scheme)]
    public class ExampleController : Controller
    {
    }

    public class ExampleController : Controller
    {
        [Authorize(AuthenticationSchemes = ApiKey.Scheme)]
        [HttpPost("...")]
        public IActionResult Method() {}
    }

Support for swagger documentation

Package adds support for webapi fields on swagger documentation. However this version requires Swashbuckle.AspNetCore of attleast version 5.0.0-beta.

    services.AddSwaggerGen(c =>
    {
        c.AddSecurityDefinition("ApiKey", ApiKey.OpenApiSecurityScheme);
        c.AddSecurityRequirement(ApiKey.OpenApiSecurityRequirement("ApiKey"));
    });

See Swagger UI for further examples.