Extension:Facebook

Facebook for Websites enables you to make your wiki more social. With this extension installed, users can log in with their Facebook accounts and access other features provided by this extension.

This extension was not developed by Facebook. The original author is no longer actively maintaining it, however the bugfixes (a list of which is here) by the Wikia development team are backported by the author once a year.

As of 2012, development has moved to GitHub. The new project page can be found at github.com/garbear/facebook-mediawiki.

Download
The extension has moved to GitHub. It can be obtained from the original developer at his GitHub page. Additional bugfixes may be found in forks by other users.
 * 1) https://github.com/garbear/facebook-mediawiki

If you would like to obtain an old version from SourceForge, you may use one of these links.
 * 1) Download SVN files via SourceForge tarball
 * 2) Browse the source code
 * 1) Browse the source code

Installation
First, like any extension, you will need to place the folder containing the PHP source files into the extensions folder of your MediaWiki installation. Make your wiki aware of the extension by including it in your Localsettings.php.

Database update
Note(1/1/12): Tables fbconnect_event_show.sql and fbconnect_event_stats.sql are not used in the latest version. If these tables exist they will be safely ignored.

Your database will need to be updated to work with Facebook. This process will probably be made much simpler for MediaWiki 1.17, but until then the update must be done from the command line. It will only work with PHP 5. Some web servers still default to PHP 4, which you can check using the following command:

$ php --version PHP 5.2.15 (cli) (built: Dec 15 2010 14:09:31)

Assuming PHP 5, run MediaWiki's update script.

$ cd path/to/site/w/ $ php maintenance/update.php

Fixing Database prefix problems
If you use a database prefix, the maintenance update script may fail. In that case, add your database prefix to the file-names in the folder /extensions/Facebook/sql to the following files: fbconnect_event_show.sql fbconnect_event_stats.sql user_fbconnect.sql and run the maintenance/update script again.

You may notice that your facebook extension is still not functional. When going to special pages -> Log in with Facebook, you get a database error, where you can observe that you have a duplicated database prefix. To fix this, edit the file extensions/Facebook/FacebookDB.php, and find the function getPrefix around line 212. Modify the return value as follows: return self::sharedDB ? $wgSharedPrefix : ""; // bugfix for $wgDBprefix; This should eliminate your double prefix issue.

Alternatively, if you are checking out via SVN or GitHub, updating to any revision above r404/48d16dd (Mar 7, 2011) will contain this fix.

Configuration
The file config.default.php contains the steps for creating a new Facebook application and different ways to customize your setup. You may edit config.default.php directly, but in order to preserve changes across updates it is recommended that you save the modified file as config.php. Alternatively, you may include your settings in Localsettings.php after the  statement above.

It is highly recommended that you enable the "Remember my login" option by default so that the user doesn't have to go through the Facebook login process each time.

Upgrading

 * Take care upgrading from older versions of this extension (from r91, pre-March 2010). Unfortunately, due to the new database layout, backwards compatibility was unable to be retained and considerable user renaming might have to be done. Updating from r100+ is safe and recommended.
 * When updating from an older version, consider bumping $wgStyleVersion.
 * Note that if you are using a version from 2011 (v3.0+), the name of the extension folder has changed from "extensions/FBConnect" to "extensions/Facebook". Simply overwriting the files in the old directory won't work because some JavaScript and CSS paths are hard-coded.

Modifying User Login form
If you want to have a Facebook Login button on the user login page, you will need to edit the nologin message at MediaWiki:Nologin. Change Don't have an account? $1. to Don't have an account? $1. You can also log in with Facebook.



The extension will automatically fill in scope="auto" with the correct permissions as determined by your configuration parameters (see FacebookAPI::getPermissions), or you can specify these explicitly.

If you have a dark-themed wiki, make sure to add colorscheme="dark" to the login button code. As far as Special:Connect goes, you have two options: search the code for fb:login-button and modify it yourself, or send the author a message on GitHub with the name of your custom skin and he'll case it separately.

Facebook Open Graph
By setting $wgFbOpenGraph</tt> to true (default) in the newest version, your wiki will be integrated into the social graph. To verify that this process is working, go to the Facebook Object Debugger and insert the link to your main page. If everything works, scroll down to "URLs" and click the link next to "Graph API". What you are seeing here us your Main Page's representation in the Open Graph. Every page on your wiki is now an endpoint in the Open Graph.