Thursday, May 30, 2013

Good Website / Links for command line one liners

Monday, May 27, 2013

XSS Filter and Modifying POST data for Spring controller

The Context :

In some cases we have to intercept the request for which we use filter concept in J2EE framework. A typical case is the one where we have to prevent XSS attacks. I was able to take care of the common stuff by implementing httpservletresponsewrapper however there were certain cases where we were posting data in a http post request .

To read this data from the request we can use the following code.

1:  StringBuffer jb = new StringBuffer();  
2:   String line = null;  
3:   try {  
4:    BufferedReader reader = request.getReader();  
5:    while ((line = reader.readLine()) != null)  
6:     jb.append(line);  
7:   } catch (Exception e) { /*report an error*/ }   
Next step is bit complicated as the following  post explains
Much thanks to original contributor. 
My code 
All i did was searched and replaced nay script tag using the following regex

private static String scriptStartpattern = "(?i)<\\s*script\\s*>";
private static String scriptEndpattern = "(?i)<\\s*/\\s*script\\s*>";

Saturday, May 4, 2013

Coursera Data science Course

Had to choose a setup for python as the course uses python.
I chose pydev as i am already well aquainted with Eclipse.
I also downloaded and installed Python.
However when i copy pasted a sample code i got some errors for imported oauth module.

as i was totally new to python i had no idea how to install modules . I soon discovered that there are two ways of doing it.

Using the following command
python.exe C:\Downloads\oauth2-1.5.211.tar\oauth2-1.5.211\oauth2-1.5.211\ install

but oauth requires setup tools
for that i had to do the following was downloaded from

python.exe C:\

THe other way is to download the module and specify the path in Eclipse.
In the properties for your pydev project, there's a pane called "PyDev - PYTHONPATH", with a sub-pane called "External Libraries". You can add source folders (any folder that has an to the path using that pane. Your project code will then be able to import modules from those source folders.