Skip to main content

Shared Access Signature and URL encoding on Windows Azure

Playing a little with Shared Access Signature was quite nice. In this moment this new functionality has a great potential. Playing a little with it I found an odd bug that I introduce from the code. From the start you need to know that this bug was generated by me and the cause of it was not Windows Azure.
Normally after we generate the access signature we are adding it to the URL that we want to access and we get a code similar to this:
var accessSignature = myTable.GetSharedAccessSignature(…);
string accessURL = tableAccessURL + … + accessSignature;
Uri accessUri = new Uri(accessURL);
string myAccessLink = accessUri.ToString();
The only problem here is that the accessSignature can contains specials characters like ‘=’ or ‘+’. This kind of characters needs to be encoded in the URL. Because of this from time to time we will get an URL that is not valid. In my case last time I got an access signature that contained this kind of specials characters for 4 times in a row. Because of this we cannot accept this kind of solutions.
A better way to get the string of an Uri object is to use AbsoluteUri for example. Or any other method that know to encode the URL characters. Using this method we will not need to worry about encoding problems. The code should look like this:
var accessSignature = myTable.GetSharedAccessSignature(…);
string accessURL = tableAccessURL + … + accessSignature;
Uri accessUri = new Uri(accessURL);
string myAccessLink = accessUri.AbsoluteUri();
Another solution for our problem is to use “EscapeUriString” method of the uri. This will do the same think for us.
In conclusion we should be carefully about how we convert any kind of Uri to a string and know very well what kind of characters can appear in it. If the URL that is generated doesn’t need to be read by a user I will also try to escape the uri string using any solutions that is available.


Popular posts from this blog

ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded

Today blog post will be started with the following error when running DB tests on the CI machine:
threw exception: System.InvalidOperationException: The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See for more information. at System.Data.Entity.Infrastructure.DependencyResolution.ProviderServicesFactory.GetInstance(String providerTypeName, String providerInvariantName) This error happened only on the Continuous Integration machine. On the devs machines, everything has fine. The classic problem – on my machine it’s working. The CI has the following configuration:

TeamCity.NET 4.51EF 6.0.2VS2013
It seems that there …

How to check in AngularJS if a service was register or not

There are cases when you need to check in a service or a controller was register in AngularJS.
For example a valid use case is when you have the same implementation running on multiple application. In this case, you may want to intercept the HTTP provider and add a custom step there. This step don’t needs to run on all the application, only in the one where the service exist and register.
A solution for this case would be to have a flag in the configuration that specify this. In the core you would have an IF that would check the value of this flag.
Another solution is to check if a specific service was register in AngularJS or not. If the service was register that you would execute your own logic.
To check if a service was register or not in AngularJS container you need to call the ‘has’ method of ‘inhector’. It will return TRUE if the service was register.
if ($injector.has('httpInterceptorService')) { $httpProvider.interceptors.push('httpInterceptorService&#…

Fundamental Books of a Software Engineer (version 2018)

More then six years ago I wrote a blog post about fundamental books that any software engineer (developer) should read. Now it is an excellent time to update this list with new entries.

There are 5 different categories of books, that represent the recommended path. For example, you start with Coding books, after that, you read books about Programming, Design and so on.
There are some books about C++ that I recommend not because you shall know C++, only because the concepts that you can learn from it.


Writing solid codeCode completeProgramming Pearls, more programming pearls(recommended)[NEW] Introduction to Algorithms


Refactoring (M. Fowler)Pragmatic ProgrammerClean code[NEW] Software Engineering: A Practitioner's Approach[NEW] The Mythical Man-Month[NEW] The Art of Computer Programming


Applying UML and Patterns (GRASP patterns)C++ coding standards (Sutter, Alexandrescu)The C++ programming language (Stroustrup, Part IV)Object-oriented programming (Peter Coad)P…