Uploading images without a file extension to WP

WP Core hacking

I used this code recently to hack wordpress’s core to allow image uploads that have no file extension.

I was getting a invalid file type security error and had tried all sorts of httaccess trickery to get it to work when I finally resorted to hacking the core of WordPress MU 3.0. This is pretty easy as I found out and only required me to add one line of code. Some of the issues I’m having are that the file size isn’t reported and neither is the dimensions. Any advice or a way for me to make this into a plugin would be very nice, as I’ve never made a wordpress plugin before.

In wp-includes/functions.php find line #2359 and look for this code, and make it look like the code below.

function wp_check_filetype( $filename, $mimes = null ) {
	if ( empty($mimes) )
		$mimes = get_allowed_mime_types();
	$type = false;
	$ext = false;

	foreach ( $mimes as $ext_preg => $mime_match ) {
		$ext_preg = '!.(' . $ext_preg . ')$!i';
		if ( preg_match( $ext_preg, $filename, $ext_matches ) ) {
			$type = $mime_match;
			$ext = $ext_matches[1];
			break;
		}
	}
// http://Green.cx (Allow Uploading of Images without Extension )
if ($ext==''){$ext='jpg'; $type='image/jpg';}
// End WordPress Core Hack
	return compact( 'ext', 'type' );
}