CelerityResourceController.php
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	<?php

	/*
	* Copyright 2012 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/**
	* Delivers CSS and JS resources to the browser. This controller handles all
	* ##/res/## requests, and manages caching, package construction, and resource
	* preprocessing.
	*
	* @group celerity
	*/
	final class CelerityResourceController extends AphrontController {

	private $path;
	private $hash;
	private $package;

	public function willProcessRequest(array $data) {
	$this->path = $data['path'];
	$this->hash = $data['hash'];
	$this->package = !empty($data['package']);
	}

	public function processRequest() {
	$path = $this->path;

	// Sanity checking to keep this from exposing anything sensitive, since it
	// ultimately boils down to disk reads.
	if (preg_match('@(//\|\.\.)@', $path)) {
	return new Aphront400Response();
	}

	$type = CelerityResourceTransformer::getResourceType($path);
	$type_map = $this->getSupportedResourceTypes();

	if (empty($type_map[$type])) {
	throw new Exception("Only static resources may be served.");
	}

	if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) &&
	!PhabricatorEnv::getEnvConfig('celerity.force-disk-reads')) {
	// Return a "304 Not Modified". We don't care about the value of this
	// field since we never change what resource is served by a given URI.
	return $this->makeResponseCacheable(new Aphront304Response());
	}

	$root = dirname(phutil_get_library_root('phabricator'));

	if ($this->package) {
	$map = CelerityResourceMap::getInstance();
	$paths = $map->resolvePackage($this->hash);
	if (!$paths) {
	return new Aphront404Response();
	}

	try {
	$data = array();
	foreach ($paths as $package_path) {
	$data[] = Filesystem::readFile($root.'/webroot/'.$package_path);
	}
	$data = implode("\n\n", $data);
	} catch (Exception $ex) {
	return new Aphront404Response();
	}
	} else {
	try {
	$data = Filesystem::readFile($root.'/webroot/'.$path);
	} catch (Exception $ex) {
	return new Aphront404Response();
	}
	}

	$xformer = new CelerityResourceTransformer();
	$xformer->setMinify(PhabricatorEnv::getEnvConfig('celerity.minify'));
	$xformer->setCelerityMap(CelerityResourceMap::getInstance());

	$data = $xformer->transformResource($path, $data);

	$response = new AphrontFileResponse();
	$response->setContent($data);
	$response->setMimeType($type_map[$type]);
	return $this->makeResponseCacheable($response);
	}

	private function getSupportedResourceTypes() {
	return array(
	'css' => 'text/css; charset=utf-8',
	'js' => 'text/javascript; charset=utf-8',
	'png' => 'image/png',
	'gif' => 'image/gif',
	'jpg' => 'image/jpg',
	'swf' => 'application/x-shockwave-flash',
	);
	}

	private function makeResponseCacheable(AphrontResponse $response) {
	$response->setCacheDurationInSeconds(60 * 60 * 24 * 30);
	$response->setLastModified(time());

	return $response;
	}

	}

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