Validating File Uploads in Kohana 3.2

five.php

echo Form::open( null, array( 'enctype' => 'multipart/form-data' ) );

four.php

$errors = Arr::merge( $post->errors( 'some/messages/post' ), $file->errors( 'some/messages/file' ) );

one.php

$post = Validation::factory( $_POST );
$file = Validation::factory( $_FILES );

three.php

if ( Request::current()->method() == Request::POST && $post->check() && $file->check() ) {
	// the request is valid, do your processing

	// save the uploaded file with the name 'form' to our destination
	$filename = Upload::save( $file['form'] );

	if ( $filename === false ) {
		throw new Exception( 'Unable to save uploaded file!' );
	}
}

two.php

$file->rule( 'form', array( 'Upload', 'not_empty' ) );
$file->rule( 'form', array( 'Upload', 'valid' ) );