Wednesday, June 1, 2011

Again chines hacker hacked google account !!

On Tuesday, Google revealed on its blog that it had been the target of a phishing campaign seemingly originating in Jinan, China, and aimed at gaining access to the accounts of senior officials in the U.S., Korea and other governments, as well as those of Chinese activists.

This kind of hacking is not new for google. Last year january also it happened where all webmail services–was vulnerable to this sort of spoof attack. That time google was seriously planing to close there operation in china. 

See how this time hacker phishing the account. 

Wednesday, May 25, 2011

CREATE WCF POST Restful service


In my last article to explain about WCF Restful service using HTTP Get method.  This works well as long as you are sending small data as information to the service. But if want to deliver huge data, HTTP GET Method is not a good choice.  

When i write any WCF service, i always use POST. Reason is the advantage of POST over GET. Using HTTP POST method, you can almost achieve everything which you can achieve from GET. Despite of this you will get some additional feature if use POST. We might say that "GET" is basically for just getting (retrieving) data whereas "POST" may involve anything, like storing or updating data, or ordering a product, or sending E-mail etc. 
1) Easy Character Encoding using application/x-www-form-urlencoded
2) No Proxy by default so always actual data from web server. 
3) Data length can be restricted by webserver, not by browser.

1) Character encoding will reduce the amount of data that can be used because of url encoding entities (i.e. three Japanese characters are converted to this: %26%2312454%3B%26%2312455%3B%26%2312502%3B)
2) Running a http request with GET can be cached on your web browser or a configured proxy server.
3) Maximum URL length is 2,083 characters in Internet Explorer (see MaxClientRequestBuffer: Use POST instead of GET to Send Large Amounts of Data in Request)
and lot more  
Extremely long URLs are usually a mistake. URLs over 2,000 characters will not work in the most popular web browser. Sending long information via URL is not a good way of implementation and also there has many restrictions i.e. max length of URL, Information format bla bla bla. For example Internet Explorer has a limitation implemented at 2083 characters. URIs is meant to be readable not to send information. 
So if you are writing any REST service and your information is long enough, better to choose POST instead of GET method.
In this article, i am going to create WCF Restful service using POST method and access it using HTTP Request. So we will have client and server both in this example code. I am creating one service which accepts HTTP Post XML request and response request data in XML format.  

Launch Visual Studio 2010. Click FILE->NEW->PROJECT. Create new "WCF Service Application". .


Once you create the project, you can see in solution that By Default WCF service and interface file are already created. Delete By default created file as we will create our own interface and WCF service file.

Now right click on solution and create one new WCF service file. I have given name to the service file as “RestServiceImpl.svc”.

We will create two DataContract classes for request and response purpose.

RequestData will receive the request from the client and ResponseData response. One very important thing is that POST XML format to the service should be same as RequestData. So the post xml request format can be like below:  

We must have to use namespace for the data contract in POST RESTFul service, which have multiple use i.e. reflects the current version of your code. The Same namespace should use in XML to Post data. Here i have given as namespace which can be changed.

Now we will write the OperationContract in IRestServiceImpl which is an interface.  Below is the code for that. 

As we can see in above code that here, Request and Response format is XML. We can change it to JSON also by changing the WebMessageFormat  from WebMessageFormat.Xml to WebMessageFormat.Json 

Implementation of Auth OperationContract in RestServiceImpl.svc.cs here.

Now let’s move to configuration part which is the last one. There will be two basic parts of the configurations file which we must have to understand.


And that’s it. Our Restful WCF POST RESTful service is ready to test. SERVICE IS READY I have created one Test WebClient in C# which makes Http request with some XML data. My application is hosted on localhost and URL is http://localhost:35798/RestServiceImpl.svc/auth . I launched and invoked service using WebClient. Below is my XML response which is correct one.

This service can be used by any language application (.NET, PHP, JAVA etc) and that is the major reason to use REST service in the application. 

Hope the article is useful for the community. Comments, suggestions and criticisms are all welcome.

You can download the source code from here .   

Thanks a Lot


Thursday, April 14, 2011

Using VS 2010 for developmement? Use Code Map extension. Great one.

Hello All

During development of enterprise application, we always have challenge to visualise the type nesting, implemented interface, member and scope, collection of all the valuable comment etc.
Recently i found one extension file which integrate with Visual Studio Solution and solve all my above mentioned issue.

There has few good tools in the market which solve this issue partially i.e. resharper etc. But they are paid one and expensive also.

VS10x Code Map is a Visual Studio 2010 extension that displays a graphical nested representation of the current code editor window (C# and VB.NET). This extension is free and can be downloaded from here. It’s very light weight (unlike resharper. It sucks :( ) and does not make any impact on your code performance.

So it’s time to evaluate this tool.

Code Visualization
If you see below screen, you can find that the left side there has a Code Visualise Window which is Code Map tool. Once you install Code Map, this tool will appear in every .cs and .vb file of your VS editor. You can see that it display all the method and interface details. Also you can easily navigate to the interface which is used in the method. On the click of each method in left windows, you will be focused on that method implementation.

Global Solution History
This widow will allow you to display all the history of the page including method name which you browsed in current session. It displays in proper format and if you click on the details, it will focus on that method in the VS editor. Please see below:

Bookmark Listing
In large code files, a code elements-based code map might not be enough. If you find yourself looking over and over for certain positions in code, then named bookmarks are for you. Simply start a comment with the BMK token and then type in a meaningful name (this will end up with something like //BMK Some name here in C# or 'BMK Some name here in VB) and VS10x Code Map will pick that up and add the name at the top of the containing element, so that you can find it instantly.

There has lot more in this tool which makes your development process ease and fast. I recommend this software to everyone who is using VS 2010 for development.

Hope this article is useful for you. Comments, suggestions and criticisms are all welcome.