Sunday, August 31, 2014

Three steps to wire up your IOC container.

How can you dynamically and flexibly wire up your inversion of control container? Here are three easy steps to consider:

  1. Reflection
  2. Explicit
  3. Configuration

First, use reflection to help wire up your boiler plate or dynamic dependencies. Second, explicitly register and customize any additional dependencies that your application needs Third, use configuration last to dynamically override any of your previous settings, allowing you to make changes to your application in a live environment without having to rebuild or deploy.

Sample Code

Microsoft's Unity offers a last in win container, so if you follow the steps above in order you will have a very flexible configuration for your container!

Sunday, August 24, 2014

xUnit Console Runner - Filter by Test Name

You can now filter by test name with the xUnit Console Runner.

Sample Code

namespace DemoProject
    public class ExampleTests
        public void HelloWorld()
        public void GoodnightMoon()

Sample Command Line

C:\>xunit.console.exe DemoProject.dll -testName "DemoProject.ExampleTests.HelloWorld" console test runner (64-bit .NET 4.0.30319.18449)
Copyright (C) 2014 Outercurve Foundation.

Starting:  DemoProject.dll
Finished: DemoProject.dll

   DemoProject.dll  Total: 1, Failed: 0, Skipped: 0, Time: 0.276s, Errors: 0


Saturday, August 16, 2014

System.Net.CredentialCache supports Digest Auth

In my last post I talked about implementing Digest Authentication in WebAPI. That was a server side implementation, but how do you make requests to that server? Good news: .NET's built in CredentialCache supports Digest Authentication!


Be sure to enable PreAuthenticate, otherwise each request will require a new digest token have to make an additional two requests to get it! Do not worry, the request will not send your credentials without having a token first.

PreAuthenticate = false

PreAuthenticate = true

Sunday, August 3, 2014

Basic and Digest mixed authentication with WebAPI

In my last post I talked about using both Basic and Digest authentication with WebAPI, but not at the same time. So what do you do when you want to used mixed authentication with both?

In principal you can support both Basic and Digest authentication at the same time, but your server has to issue the 401 challenge with Digest. This is because basic requires no token or server information to authenticate, where as digest requires a nonce from the server.

I have updated Rick's Basic authentication and Badri's Digest authentication implementation to work together as a pair of AuthorizationFilterAttributes. Here is the source:

public static class WebApiConfig
    public static void Register(HttpConfiguration config)
        config.Filters.Add(new BasicAuthorizationFilterAttribute(false));
        config.Filters.Add(new DigestAuthorizationFilterAttribute());
            new { controller = "data", id = RouteParameter.Optional }


Thursday, July 31, 2014

WebAPI and Chrome Authentication Types

Google Chrome supports four HTTP authentication types:

  1. Basic
  2. Digest
  3. NTLM
  4. Negotiate

ASP.NET WebAPI has AuthorizationFilterAttributes which can be used to implement both Authentication and Authorization for your APIs. If you want to use Basic or Digest authentication, there are already several open source implementations available to help you out!

Do you need to used mixed authentication and support both Basic and Digest?
If so, be sure to check out my next blog post...


Sunday, July 27, 2014

RavenDB 2.5 vs 3.0 Write Performance (so far)

Is Voron out performing Esent in RavenDB 3.0?

...not yet, at least in terms of write speed. I ran a few tests on my home machine to compare the write and indexing speeds of Raven 2.5 (build 2908) against Raven 3.0 (build 3358). Unfortunately the results were not encouraging. However it is worth pointing out that the Raven team did save their performance updates for last when releasing Raven 2.5, so I do expect that this will improve before we see an RC.

Test Results

Here are the results of my (little) performance tests:

Document Count RavenDB 2.5 RavenDB 3.0 Difference
Elapsed Import Time Elapsed Index Time Elapsed Import Time Elapsed Index Time Import Percent Index Percent
0 - 100k 0:57.48 1:41.45 1:08.59 1:25.39 -19.33% 15.82%
100k - 200k 1:02.68 1:34.85 1:10.87 1:35.65 -13.08% -0.84%
200k - 300k 1:00.34 2:17.84 1:12.94 1:47.20 -20.89% 22.22%
300k - 400k 1:00.85 1:38.59 1:13.46 1:45.61 -20.73% -7.12%
400k - 500k 1:02.03 1:38.70 1:12.03 1:58.51 -16.12% -20.07%

Saturday, July 19, 2014

Python 2.6 and HTTP Basic Authentication

I recently encountered an issue where adding basic authentication to some HTTP calls was breaking a Python application.

Come to find out there is a bug in Python 2.6 that appends a newline character to base 64 encoded strings. That newline character then causes your HTTP request to be malformed, so that the body does not match the content length. When consuming these malformed requests in an ASP.NET sever the body content would cut off early, and in the case of JSON content this made it so that the JSON string was incomplete and could not be parsed.

So what's the fix? You can either update Python, or fix your string after encoding.


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