Category: tutorials

find . -name .DS_Store -printf \"%p\"\ \ | xargs rm
15 1 * * * root find / -name ".DS_Store" -depth -exec rm {} \;

This is a fast forward tutorial which will guide you through django installation on virtualenv. Detailed installation instructions using source codes can be found on respective package’s official site.

Pre- Requirements:
Make sure you have easy_install on MAC
Install pip using easy_install pip

1) Installing Virtualenv: Run following lines in terminal:

[code lang=”bash” gutter=”false”]
pip install virtualenv
pip install virtualenvwrapper

# Use a text editor to edit .profile and Insert following lines. Eg using vim:
# $ vim .profile
export WORKON_HOME=$HOME/.virtualenvs
export PROJECT_HOME=$HOME/Devel
source /usr/local/bin/virtualenvwrapper.sh

# Now open a new terminal window and Type:
mkvirtualenv myfirstproject

# You will see something like:
(myfirstproject) $

# This means you are now working isolatedly in myfirstproject
# The location of this project is ~/.virtualenvs/myfirstproject
[/code]

2) Installing Django and South:

[code lang=”bash” gutter=”false”]

# [info] Make sure you are inside myfirstproject:
# $ workon myfirstproject
# Now run in terminal:

pip install Django
pip install south

# This installs Django in: .virtualenvs/myfirstproject/lib/python2.6/site-packages/django/

[/code]

3) Starting first django project:

• [info] Type workon myfirstproject if you are not already in your virtual environment.
• [info] you can directly go to your site packages dir by typing cdsitepackages
• [info] can check the location of django-admin by which django-admin.py
• Initiating django project now. Assuming you are at .virtualenvs/myfirstproject/ Type:
• django-admin.py startproject mydjangoproject
• This will start your first django project.
• Now start server by
• python manage.py runserver Default port is 8000. If you have to change port, just write port number after runserver
• Now, Visit browser at localhost:8000
• Congrats, we have just installed a basic django app.

Recently, I wanted to obfuscate HTML text for some reasons. I found this link http://www.voormedia.com/en/tools/html-obfuscate-scrambler.php
for scrambling text.

My HTML document was:

[code lang=”html”]
<div id=”pictures”>
<h2>Exterior</h2>
<a class=”hyperlinks” href=”link”> link1 inside Exterior</a>
<a class=”hyperlinks” href=”link”> link2 inside Exterior</a>
<a class=”hyperlinks” href=”link”> link3 inside Exterior</a>
<h2>Interior</h2>
<a class=”hyperlinks” href=”link”> link1 inside Interior</a>
<a class=”hyperlinks” href=”link”> link2 inside Interior</a>
<a class=”hyperlinks” href=”link”> link3 inside Interior</a>
<a class=”hyperlinks” href=”link”> link4 inside Interior</a>
<h2>Specific text 3</h2>
<a class=”hyperlinks” href=”link”> link1 inside specific text 3</a>
<a class=”hyperlinks” href=”link”> link2 inside specific text 3</a>
</div>
[/code]

The obfuscated code generated by http://www.voormedia.com/en/tools/html-obfuscate-scrambler.php:

[code lang=”js”]
<script type=”text/javascript” language=”JavaScript”>
var i,y,x=”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”;
y=”;
for(i=0;i<x.length;i+=2)
{y+=unescape(‘%’+x.substr(i,2));}
document.write(y);
</script>
[/code]

Basically the obfuscation script thinly disguised each character as hexadecimal value and puked out the unescaped version via a simple document.write js call.

Now, I decided to deobfuscate this obfuscated code. For this, I needed to HTML encode the value of “y” before passing it to document.write(). To my surprise, there is no native HTML encode function in javascript. Apparently, there is not much use of HTML encode function as its assumed that all HTML encoding comes from server side itself. But you can clearly feel its requirement if you are a pro developer, as illustrated in this example here.

Fortunately, a tweaked version of HTML encode can be constructed by appending normal unescaped string inside text node of a psuedo div element. Then returning the innerhtml of this div.
Here is the function code:

[code lang=”js”]
<script type=”text/javascript” language=”JavaScript”>
function HTMLencode(value)
{
var div = document.createElement(‘div’);
var text = document.createTextNode(value);
div.appendChild(text);
return div.innerHTML;
}
</script>
[/code]

Finally, here’s the complete code to deobfuscate:

[code lang=”js”]
<script type=”text/javascript” language=”JavaScript”>
function HTMLencode(value)
{
var div = document.createElement(‘div’);
var text = document.createTextNode(value);
div.appendChild(text);
return div.innerHTML;
}

var i,y,x=”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”;
y=”;
for(i=0;i<x.length;i+=2)
{y+=unescape(‘%’+x.substr(i,2));}
document.write(HTMLencode(y));
</script>
[/code]