stylesheet.php
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stylesheet.php
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	<?php

	class Assets {
	const ASSETS_DIRECTORY = 'resources/assets/';

	static public function getAssetsDirectory () {
	return dirname(__DIR__) . "/" . static::ASSETS_DIRECTORY;
	}

	static private function getAssetExtension ($type) {
	return $type;
	}

	static public function getAssetFilename ($type, $name) {
	return
	static::getAssetsDirectory()
	.
	"$type/$name."
	.
	static::getAssetExtension($type)
	;
	}

	/**
	* Checks the resource has a valid format for sanity and to avoid
	* exploits trying to load an arbitrary resource URL.
	*
	* @param $name string The resource name
	* @return bool true if the resource name is valid; otherwise, false.
	*/
	static public function isValidAssetName ($name) {
	return preg_match('/^[A-Za-z0-9\-_]*$/', $name);
	}
	}

	class Stylesheet {
	///
	/// CSS
	///

	static private function printHeaders () {
	header("Content-type: text/css");
	header("X-Content-Type-Options: nosniff");
	}

	static public function compileLess ($file) {
	return `plessc $file`;
	}

	static public function printLess ($name) {
	$file = Assets::getAssetFilename('less', $name);

	if (file_exists($file)) {
	static::printHeaders();
	echo static::compileLess($file);
	} else {
	static::print404();
	}
	}

	///
	/// 404
	///

	static private function print404Headers () {
	header("HTTP/1.0 404 Not Found");
	}

	static private function print404 () {
	static::print404Headers();
	echo "/* 404 - Stylesheet not found. */";
	exit;
	}

	///
	/// Routes
	///

	static public function handleRequest () {
	$name = $_GET['name'];

	if (!Assets::isValidAssetName($name)) {
	die("Invalid resource name: $name");
	}

	switch ($_GET['resource']) {
	case 'less':
	static::printLess($name);
	break;

	default;
	die("Resource not found.");
	}
	}
	}

	Stylesheet::handleRequest();

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