Ticket #41934: is_bad_request_test_revision2.php

<?php
// Load the WordPress Environment
// define( 'WP_DEBUG', true ); /* uncomment for debug mode */


require('./wp-load.php');

/**
 * Check if we have received a junk request, based on file extension.
 *
 * Use the 'wp_is_bad_request_extensions' filter to add or remove allowed file extensions.
 *
 * Use the 'wp_is_bad_request' filter to return the boolean value of a custom evaluation.
 *
 * As a 'best practice', plugin developers should utilize this function as a
 * way to prevent running plugin code unnecessarily.
 *
 * @uses wp_get_mime_types() to retrieve list of mime types and file extensions.
 *
 * @author Robert D Payne <rpayne@rdptechsolutions.com>
 *
 * @param string $extension Extension of requested file
 * @return bool True if the the HTTP request is considered junk, false otherwise
 */
function wp_is_bad_request($extension = '') {
    $isBad = false;

        if(empty($extension)):
                $url = (isset($_SERVER['REQUEST_URI']))? $_SERVER['REQUEST_URI'] : '';
                $url_parts = parse_url($url);
                $path = (empty($url_parts["path"]))? '' : $url_parts["path"];
                $extension = pathinfo($path, PATHINFO_EXTENSION);
        endif;


    if(!empty($extension)):
        $ext = strtolower($extension);
        $mimes = apply_filters('wp_is_bad_request_extensions', wp_get_mime_types()) ;
                $extList = array();

        foreach ($mimes as $key => $value) {
            $ak = explode('|', $key);
            $extList = array_merge($extList,$ak)  ;
        }

                $isBad = in_array($ext, $extList);
    endif;

    return apply_filters( 'wp_is_bad_request', $isBad);
}//is_bad_request


// allow HTTP requests for audio files
add_filter('wp_is_bad_request_extensions', 'rdp_mime_types_filter');
function rdp_mime_types_filter($mimes){
        echo 'apply filter to allow HTTP requests for audio files';
    unset($mimes['mp3|m4a|m4b']);
    unset($mimes['ra|ram']);
    unset($mimes['wav']);
    unset($mimes['ogg|oga']);
    unset($mimes['mid|midi']);
    unset($mimes['wma']);
    unset($mimes['wax']);
    unset($mimes['mka']);
    return $mimes;
}

echo "test: wp_is_bad_request()<br>";
echo 'expected value: false<br>';
$isBad = wp_is_bad_request();
var_dump($isBad);

// ico extension
echo "test: wp_is_bad_request('ico')<br>";
echo 'expected value: true<br>';
$isBad = wp_is_bad_request('ico');
var_dump($isBad);

// wav extension
echo "test: wp_is_bad_request('wav')<br>";
echo 'expected value: false<br>';
$isBad = wp_is_bad_request('wav');
var_dump($isBad);




/**
 * Don't load all of WordPress when handling a favicon.ico request.
 *
 * Instead, send the headers for a zero-length favicon and bail.
 *
 * @since 3.0.0
 */
function wp_favicon_request_x() {
        $isBad = wp_is_bad_request();
        if($isBad){
                header('Content-Type: image/vnd.microsoft.icon');
                exit;
        }
}