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Monthly Archives / January 2014

  • Jan 31 / 2014
  • 0
Android, Google Chrome

Set Chrome as default browser on Android

You have just installed Chrome on your Android device, and you now want to define it as default for your browser. Badly, you already have a browser installed on your phone which is the default browser… here are the steps to modify this:

  1. Go in the Settings of your phone
  2. In these settings, open the Applications parameters
  3. Once opened, look for the actual default browser (can be called Browser, Internet, …)
  4. Choose it, and under the Launch by default section, click on Clear defaults
  5. Go back to the Home and try to open any Internet link, the phone will now ask you which is the browser you want to use as default. You just need to choose Chrome

Voila, Chrome is now your default browser !

  • Jan 27 / 2014
  • 0
Python, web2py

Web2py framework

Do you like web development and Python ? You’re looking for a framework free, complete and in a constant evolution (features, security, …) ? So Web2py is for you !

web2py is a free, open-source web framework for agile development of secure database-driven web applications; it is written in Python and programmable in Python. web2py is a full-stack framework, meaning that it contains all the components you need to build fully functional web applications.

web2py is designed to guide a web developer to follow good software engineering practices, such as using the Model View Controller (MVC) pattern. web2py separates the data representation (the model) from the data presentation (the view) and also from the application logic and workflow (the controller). web2py provides libraries to help the developer design, implement, and test each of these three parts separately, and makes them work together.

web2py is built for security. This means that it automatically addresses many of the issues that can lead to security vulnerabilities, by following well established practices. For example, it validates all input (to prevent injections), escapes all output (to prevent cross-site scripting), renames uploaded files (to prevent directory traversal attacks). web2py takes care of main security issues, so developers have less chances of introducing vulnerabilities.

web2py includes a Database Abstraction Layer (DAL) that writes SQL dynamically so that you, the developer, don’t have to. The DAL knows how to generate SQL transparently for SQLite, MySQL, PostgreSQL, MSSQL, FireBird, Oracle, IBM DB2, Informix and Ingres.

The DAL can also generate function calls for the Google Datastore when running on the Google App Engine (GAE). Experimentally we support more databases and new ones are constantly added. Please check on the web2py web site and mailing list for more recent adapters. Once one or more database tables are defined, web2py automatically generates a fully functional web-based database administration interface to access the database and the tables.

web2py differs from other web frameworks in that it is the only framework to fully embrace the Web 2.0 paradigm, where the web is the computer. In fact, web2py does not require installation or configuration; it runs on any architecture that can run Python (Windows, Windows CE, Mac OS X, iOS, and Unix/Linux), and the development, deployment, and maintenance phases for the applications can be done via a local or remote web interface. web2py runs with CPython (the C implementation) and PyPy (Python written in Python), on Python versions 2.5, 2.6, and 2.7.

web2py provides a ticketing system for error events. If an error occurs, a ticket is issued to the user, and the error is logged for the administrator.

web2py is open source and released under the LGPL version 3 license.

Official website : Official Website Web2py
Informations source : Web2py Book

  • Jan 26 / 2014
  • 0
Google Chrome

Uninstall manually a Chrome extension

It can sometimes happen that an extension doesn’t want to be uninstalled with the steps provided by Google Chrome Support (to be tried first): https://support.google.com/chrome/answer/113907?hl=en.

Don’t worry, there’s a workaround available to delete definitely and manually this extension. Here are the steps:

  • Type about:extensions in the address bar and click on Developer Mode in the top-right hand corner
  • You will so find a ID line below any extension name. Copy this extension ID in a external text editor for example (you will need it several times later).
  • Right now, close entirely Chrome
  • Open Windows Start Menu and type the following line in the search box (or in the Execute menu):
    %LOCALAPPDATA%\Google\Chrome\User Data\Default\Extensions
  • In the explorer which has just opened, delete the folder with the ID matching the ID you have previously retrieved.
  • With the same steps, now access to this folder:
    %LOCALAPPDATA%\Google\Chrome\User Data\Default\Local Storage
  • In this folder, check if there is a file with a name such like chrome-extension_ID_0.localstorage (replace the ID value with the good one from your extension). If there is, delete it also.
  • Finally, one last step to be sure that this extension won’t re-install by itself automatically, you can check by typing regedit in the search bar of your Start Menu and then find the following path: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\ExtensionInstallForcelist. Check that there is no entry containing the extension ID.
  • If there is, delete it ; else, everything is good !
  • You can now restart Chrome, and everything should run smoothly and fine !

Here it is, the extension doesn’t exist anymore on your PC ! (Don’t worry, you will be able to re-install it later if you want).

  • Jan 26 / 2014
  • 0

Install FTP server – PureFTPd

You want to set up an FTP server on your Linux installation ?

Here are the main steps you can use to set up very quickly a reliable and secure server under BSD licence : Pure-FTPd. The commands used in this tutorial are the commands available under Ubuntu Server and can so be different depending on the distribution you are using, especially on the packages installation.

Package installation :

sudo apt-get install pure-ftpd pure-ftpd-common

Group ftpgroup creation:

sudo groupadd ftpgroup

User ftpuser creation (linux user):

sudo useradd -g ftpgroup -d /dev/null -s /usr/sbin/nologin ftpuser

We can now create the user myuser (FTP user):

sudo pure-pw useradd myuser -u ftpuser -g ftpgroup -d /var/www/

Les options sont les suivantes :

  • -u uid
  • -g gid
  • -d user home

If you want to change the user password, just use the following command-line:

sudo pure-pw passwd myuser

Any time you perform a change or a creation of any user, you will need to re-generate the users database:

sudo pure-pw mkdb

Then you can activate the authentication linked to Pure-FTPd and restart the server:

sudo ln -s /etc/pure-ftpd/conf/PureDB /etc/pure-ftpd/auth/50pure
sudo /etc/init.d/pure-ftpd restart

For a complete documentation, let’s go to the official PureFTPd website.

  • Jan 22 / 2014
  • 0

Activate developer options on your Android Device

Since Android 4.0, the developer options have disappeared from Android settings.

Actually, they have not really “disappeared”, they have just been hidden to avoid to display them for some users who would not have any usefulness in it and who could be afraid to do an error.

To enable them again, the steps to follow are really simple:

  1. Go in the General settings of Android
  2. Under System section, open the About Phone menu
  3. Tap 7 times on the Build Number (you will see a nice message displayed)
  4. The developer options are now unlocked

You can now use the developer options and use them for development and perform some applications debugging. Enjoy 😉 !

Question ? Contact