I just came across a problem when i tried to add a Bitcoin Donation Button to my WordPress installation.
Always when i tried to add a link which started with „bitcoin:“ so it is recognized by the Wallet Software on my Desktop WordPress totally crippled the link, stripping out the „bitcoin:“ URI.
Would not have been a big deal but i wanted to have this resolved. It seems that WordPress filter that URI so that only „valid“ URI’s are accepted like http or ftp.
Now i searched for a solution where i don’t have to change core files (which is bad) or theme files so that it also would work after an updated. After researching a bit i found a solution using WordPress „Must-use-plugins“.
So what you have to do? Simply FTP to your WordPress install directory and add a directory called mu-plugins inside your wp-content folder.
Now create a textfile called bitcoin-uri-enabler.php and paste this content into it:
<?php
/**
* Plugin Name: Bitcoin URI enabler
* Plugin URI: http://blog.sengotta.net
* Description: This plugin enables the Bitcoin URI on your WordPress installation
* Author: Björn Sengotta
* Author URI: http://blog.sengotta.net
* Version: 0.1.0
*/
function ss_allow_bitcoin_protocol( $protocols ){
$protocols[] = 'bitcoin';
return $protocols;
}
add_filter( 'kses_allowed_protocols' , 'ss_allow_bitcoin_protocol' );
?>
Upload that file to the mu-plugins folder. The plugins is activated be default and you can find it in your Dashboard under Plugins- Must-Use.
The bitcoin URI should now be correctly recognized by WordPress.
To achieve the following infos were really helpful:
http://justintadlock.com/archives/2011/02/02/creating-a-custom-functions-plugin-for-end-users
http://sevenspark.com/tutorials/skype-uri-link-wordpress-menu