Monday, January 25, 2010

YATC (yet another twitter client)

image My twitter followers have probably realize by now that I’ve been playing around with the Twitter API. I’ve been trying out the API and I created a command line tool to update my twitter status.
I tried lots of clients but it is still a pain in the a*s to go to a different application or web browser to update my status.
I have a command line window open all the time so now I’ll be easier to update my status. In case you want to give it a try you can download it from here. The use is real simple, just type twit <your status> and that’s it. If it is the first time you run it it’ll ask you for your twitter credentials.

Edit: as of today (Jan 28th, 2010) twit has integration. Just type your status with a url and twit will post the short version of it. Yes! I like playing with web APIs.
As always, this bits have the “works on my machine” warranty :)

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Monday, January 18, 2010

Moving from basicHttpBinding to customBinding

We’ve been having a few issues with some users that cannot authenticate to Genexus Server. Logging the server side, thanks to SvcConfigEditor, I found that the probles had nothing to do with the user credentials themselves but with some WCF configuration that prevent packages “from the future” to reach the server.

How did that happen, and most important, how do I change it?  It happened because of daylight saving (global warming is everywhere). WCF has a under the hood feature that prevents your server to be reached by packages with a timestamp away 5 minutes (default value) from the server’s time (taken to UTC). Apparently, not everybody has its computer set up correctly with the correct date/time setting, so when one of them changed (the client or the server) the server would not validate the client.

So, how do you change that with your existante basicHttpBinding? you can’t! :( What you have to do is creating a customBinding and modify the maxClockSkew attribute of the security tag. And how do you do that? Well, lucky us there’s a tool that does that for us. It’s called WcfBindingBox (hopefully will stay there for a while) and you simply paste your current binding configuration and when you click ‘Convert to CustomBinding!’ well… it does just that!

After using that new config on my dev server I had the following error while authenticating:

“A supporting token that satisfies parameters 'System.ServiceModel.Security.Tokens.UserNameSecurityTokenParameters:
InclusionMode: AlwaysToRecipient
ReferenceStyle: Internal
RequireDerivedKeys: False' and attachment mode 'SignedEncrypted' was not provided.”

And the problem was exactly what the message says (unbelievable). All I did to fix it was creating an instance of the UserNameSecurityTokenParameters class, configure the properties mentioned on the message and add it to my TransportSecurityBindingElement.

I lost a whole with this so I hope it will be useful to someone else.

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