Аутентификация Swagger в службе приложений Azure

Внимание: минимальное тестирование (и обязательно измените способ подтверждения пользователя/пароля)

public class BasicAuthMessageHandler : DelegatingHandler
{
    private const string BasicAuthResponseHeader = "WWW-Authenticate";
    private const string BasicAuthResponseHeaderValue = "Basic";

    public BasicAuthMessageHandler(HttpMessageHandler innerHandler)
    {
        this.InnerHandler = innerHandler;
    }

    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        AuthenticationHeaderValue authValue = request.Headers.Authorization;
        HttpResponseMessage unauthorizedResponse = request.CreateUnauthorizedResponse();

        if (authValue != null && !string.IsNullOrWhiteSpace(authValue.Parameter))
        {
            Credentials parsedCredentials = ParseAuthorizationHeader(authValue.Parameter);
            if (parsedCredentials != null)
            {
                // TODO: Check that the user/pass are valid
                if (parsedCredentials.Username == "user" &&
                    parsedCredentials.Password == "pass")
                {
                    // If match, pass along to the inner handler
                    return base.SendAsync(request, cancellationToken);
                }
            }
        }
        else
        {
            // Prompt for creds
            unauthorizedResponse.Headers.Add(BasicAuthResponseHeader, BasicAuthResponseHeaderValue);
        }

        return Task.FromResult(unauthorizedResponse);
    }

    private Credentials ParseAuthorizationHeader(string authHeader)
    {
        string[] credentials = Encoding.ASCII.GetString(Convert
                                                        .FromBase64String(authHeader))
                                                        .Split(
                                                        new[] { ':' });
        if (credentials.Length != 2 || string.IsNullOrEmpty(credentials[0])
            || string.IsNullOrEmpty(credentials[1])) return null;
        return new Credentials()
        {
            Username = credentials[0],
            Password = credentials[1],
        };
    }
}

Регистрация на маршруте Swagger

// Do this after calling ConfigureSwagger
ConfigureSwagger(config);

// Remove the swagger_ui route and re-add it with the wrapped handler.
var route = config.Routes["swagger_ui"];
config.Routes.Remove("swagger_ui");
config.Routes.MapHttpRoute("swagger_ui", route.RouteTemplate, route.Defaults, route.Constraints, new BasicAuthMessageHandler(route.Handler));