Extension:Yahoo

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Please Upgrade to 1.0a or above from all version to prevent a XSS attack

<?php
 
// MediaWiki Yahoo Extension Ver 1.1 (http://wwww.mediawiki.org/wiki/Extension:Yahoo)
 
// Extension credits that show up on Special:Version
$wgExtensionCredits['parserhook'][] = array(
        'name' => 'Yahoo',
        'author' => 'Guy Taylor',
        'url' => 'http://www.mediawiki.org/wiki/Extension:Yahoo',
        'description' => 'Render Yahoo Button showing users online status.'
);
 
// set up MediaWiki to react to the "<yahoo>" tag
$wgExtensionFunctions[] = "wfYahoo";
 
function wfYahoo() {
        global $wgParser;
        $wgParser->setHook( "yahoo", "RenderYahoo" );
}
 
 
// the function that reacts to "<yahoo>"
 
function RenderYahoo( $input, $argv ) {
 
// set your defaults for the style and action (addfriend, call or sendim) (0, 1, 2, 3 and 4)
 
        $style_default = "2" ;
        $action_default = "sendim" ;
 
// escape $input to prevent XSS
        $input = htmlspecialchars($input) ;
 
// the varibles are: <yahoo style="$argv['style']" action="$argv['action']">$input</yahoo>
 
// test to see if the optinal elements of the tags are set and supported. if not set them to the defaults
 
        if( isset( $argv['style'] ) ){
                $style = $argv['style'] ;
                if( !($style == "0" OR $style == "1" OR $style == "2" OR $style == "3" OR $style == "4" OR $style == "5" ) ){
                        $style = $style_default ;
                }
        } else {
                $style = $style_default ;
        }
 
        if( isset( $argv['action'] ) ){
                $action = $argv['action'] ;
                if( !($action == "addfriend" OR $action == "sendim" OR $action == "call") ){
                        $action = $action_default ;
                }
        } else {
                $action = $action_default ;
        }
 
// set the url to the image and the style of the image
        switch( $style ){
 
                case "0":    
                        $image = '<img src="http://opi.yahoo.com/online?u='.$input.'&m=g&t=0" ' ;
                        $image .= ' style="border: none; width: 12px; height: 12px;" alt="My status" />' ;
                break;
 
                case "1":    
                        $image = '<img src="http://opi.yahoo.com/online?u='.$input.'&m=g&t=1" ' ;
                        $image .= ' style="border: none; width: 64px; height: 16px;" alt="My status" />' ;
                break;
 
                case "2":    
                        $image = '<img src="http://opi.yahoo.com/online?u='.$input.'&m=g&t=2" ' ;
                        $image .= ' style="border: none; width: 125px; height: 25px;" alt="My status" />' ;
                break;
 
                case "3":    
                        $image = '<img src="http://opi.yahoo.com/online?u='.$input.'&m=g&t=3" ' ;
                        $image .= ' style="border: none; width: 86px; height: 16px;" alt="My status" />' ;
                break;
 
                case "4":
                        $image = '<img src="http://opi.yahoo.com/online?u='.$input.'&m=g&t=4" ' ;
                        $image .= ' style="border: none; width: 12px; height: 12px;" alt="My status" />' ;                  
                break;
                case "5":
                        $image = '<img src="http://opi.yahoo.com/online?u='.$input.'&m=g&t=5" ' ;
                        $image .= ' style="border: none; width: 12px; height: 12px;" alt="My status" />' ;                  
               break;
 
     }
 
// start the rendering the html outupt
     $output  = '<!-- MediaWiki extension http://www.mediawiki.org/wiki/Extension:Yahoo -->';
     $output .= '<a href="ymsgr:'.$action.'?'.$input.'">'.$image.'</a>';
     $output .= '<!-- end of Yahoo button -->';
 
// send the output to MediaWiki
     return $output;
}