friendica/src/App/Router.php

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<?php
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/**
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* @copyright Copyright (C) 2010-2021, the Friendica project
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*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\App;
use FastRoute\DataGenerator\GroupCountBased;
use FastRoute\Dispatcher;
use FastRoute\RouteCollector;
use FastRoute\RouteParser\Std;
use Friendica\Core\Cache\Enum\Duration;
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use Friendica\Core\Cache\Capability\ICanCache;
use Friendica\Core\Hook;
use Friendica\Core\L10n;
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use Friendica\Core\Lock\Capability\ICanLock;
use Friendica\Network\HTTPException;
/**
* Wrapper for FastRoute\Router
*
* This wrapper only makes use of a subset of the router features, mainly parses a route rule to return the relevant
* module class.
*
* Actual routes are defined in App->collectRoutes.
*
* @package Friendica\App
*/
class Router
{
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const DELETE = 'DELETE';
const GET = 'GET';
const PATCH = 'PATCH';
const POST = 'POST';
const PUT = 'PUT';
const OPTIONS = 'OPTIONS';
const ALLOWED_METHODS = [
self::DELETE,
self::GET,
self::PATCH,
self::POST,
self::PUT,
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self::OPTIONS
];
/** @var RouteCollector */
protected $routeCollector;
/**
* @var string The HTTP method
*/
private $httpMethod;
/**
* @var array Module parameters
*/
private $parameters = [];
/** @var L10n */
private $l10n;
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/** @var ICanCache */
private $cache;
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/** @var ICanLock */
private $lock;
/** @var string */
private $baseRoutesFilepath;
/**
* @param array $server The $_SERVER variable
* @param string $baseRoutesFilepath The path to a base routes file to leverage cache, can be empty
* @param L10n $l10n
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* @param ICanCache $cache
* @param RouteCollector|null $routeCollector
*/
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public function __construct(array $server, string $baseRoutesFilepath, L10n $l10n, ICanCache $cache, ICanLock $lock, RouteCollector $routeCollector = null)
{
$this->baseRoutesFilepath = $baseRoutesFilepath;
$this->l10n = $l10n;
$this->cache = $cache;
$this->lock = $lock;
$httpMethod = $server['REQUEST_METHOD'] ?? self::GET;
$this->httpMethod = in_array($httpMethod, self::ALLOWED_METHODS) ? $httpMethod : self::GET;
$this->routeCollector = isset($routeCollector) ?
$routeCollector :
new RouteCollector(new Std(), new GroupCountBased());
if ($this->baseRoutesFilepath && !file_exists($this->baseRoutesFilepath)) {
throw new HTTPException\InternalServerErrorException('Routes file path does\'n exist.');
}
}
/**
* This will be called either automatically if a base routes file path was submitted,
* or can be called manually with a custom route array.
*
* @param array $routes The routes to add to the Router
*
* @return self The router instance with the loaded routes
*
* @throws HTTPException\InternalServerErrorException In case of invalid configs
*/
public function loadRoutes(array $routes)
{
$routeCollector = (isset($this->routeCollector) ?
$this->routeCollector :
new RouteCollector(new Std(), new GroupCountBased()));
$this->addRoutes($routeCollector, $routes);
$this->routeCollector = $routeCollector;
// Add routes from addons
Hook::callAll('route_collection', $this->routeCollector);
return $this;
}
private function addRoutes(RouteCollector $routeCollector, array $routes)
{
foreach ($routes as $route => $config) {
if ($this->isGroup($config)) {
$this->addGroup($route, $config, $routeCollector);
} elseif ($this->isRoute($config)) {
$routeCollector->addRoute($config[1], $route, $config[0]);
} else {
throw new HTTPException\InternalServerErrorException("Wrong route config for route '" . print_r($route, true) . "'");
}
}
}
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/**
* Adds a group of routes to a given group
*
* @param string $groupRoute The route of the group
* @param array $routes The routes of the group
* @param RouteCollector $routeCollector The route collector to add this group
*/
private function addGroup(string $groupRoute, array $routes, RouteCollector $routeCollector)
{
$routeCollector->addGroup($groupRoute, function (RouteCollector $routeCollector) use ($routes) {
$this->addRoutes($routeCollector, $routes);
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});
}
/**
* Returns true in case the config is a group config
*
* @param array $config
*
* @return bool
*/
private function isGroup(array $config)
{
return
is_array($config) &&
is_string(array_keys($config)[0]) &&
// This entry should NOT be a BaseModule
(substr(array_keys($config)[0], 0, strlen('Friendica\Module')) !== 'Friendica\Module') &&
// The second argument is an array (another routes)
is_array(array_values($config)[0]);
}
/**
* Returns true in case the config is a route config
*
* @param array $config
*
* @return bool
*/
private function isRoute(array $config)
{
return
// The config array should at least have one entry
!empty($config[0]) &&
// This entry should be a BaseModule
(substr($config[0], 0, strlen('Friendica\Module')) === 'Friendica\Module') &&
// Either there is no other argument
(empty($config[1]) ||
// Or the second argument is an array (HTTP-Methods)
is_array($config[1]));
}
/**
* The current route collector
*
* @return RouteCollector|null
*/
public function getRouteCollector()
{
return $this->routeCollector;
}
/**
* Returns the relevant module class name for the given page URI or NULL if no route rule matched.
*
* @param string $cmd The path component of the request URL without the query string
*
* @return string A Friendica\BaseModule-extending class name if a route rule matched
*
* @throws HTTPException\InternalServerErrorException
* @throws HTTPException\MethodNotAllowedException If a rule matched but the method didn't
* @throws HTTPException\NotFoundException If no rule matched
*/
public function getModuleClass($cmd)
{
$cmd = '/' . ltrim($cmd, '/');
$dispatcher = new Dispatcher\GroupCountBased($this->getCachedDispatchData());
$moduleClass = null;
$this->parameters = [];
$routeInfo = $dispatcher->dispatch($this->httpMethod, $cmd);
if ($routeInfo[0] === Dispatcher::FOUND) {
$moduleClass = $routeInfo[1];
$this->parameters = $routeInfo[2];
} elseif ($routeInfo[0] === Dispatcher::METHOD_NOT_ALLOWED) {
throw new HTTPException\MethodNotAllowedException($this->l10n->t('Method not allowed for this module. Allowed method(s): %s', implode(', ', $routeInfo[1])));
} else {
throw new HTTPException\NotFoundException($this->l10n->t('Page not found.'));
}
return $moduleClass;
}
/**
* Returns the module parameters.
*
* @return array parameters
*/
public function getModuleParameters()
{
return $this->parameters;
}
/**
* If a base routes file path has been provided, we can load routes from it if the cache misses.
*
* @return array
* @throws HTTPException\InternalServerErrorException
*/
private function getDispatchData()
{
$dispatchData = [];
if ($this->baseRoutesFilepath) {
$dispatchData = require $this->baseRoutesFilepath;
if (!is_array($dispatchData)) {
throw new HTTPException\InternalServerErrorException('Invalid base routes file');
}
}
$this->loadRoutes($dispatchData);
return $this->routeCollector->getData();
}
/**
* We cache the dispatch data for speed, as computing the current routes (version 2020.09)
* takes about 850ms for each requests.
*
* The cached "routerDispatchData" lasts for a day, and must be cleared manually when there
* is any changes in the enabled addons list.
*
* Additionally, we check for the base routes file last modification time to automatically
* trigger re-computing the dispatch data.
*
* @return array|mixed
* @throws HTTPException\InternalServerErrorException
*/
private function getCachedDispatchData()
{
$routerDispatchData = $this->cache->get('routerDispatchData');
$lastRoutesFileModifiedTime = $this->cache->get('lastRoutesFileModifiedTime');
$forceRecompute = false;
if ($this->baseRoutesFilepath) {
$routesFileModifiedTime = filemtime($this->baseRoutesFilepath);
$forceRecompute = $lastRoutesFileModifiedTime != $routesFileModifiedTime;
}
if (!$forceRecompute && $routerDispatchData) {
return $routerDispatchData;
}
if (!$this->lock->acquire('getCachedDispatchData', 0)) {
// Immediately return uncached data when we can't aquire a lock
return $this->getDispatchData();
}
$routerDispatchData = $this->getDispatchData();
$this->cache->set('routerDispatchData', $routerDispatchData, Duration::DAY);
if (!empty($routesFileModifiedTime)) {
$this->cache->set('lastRoutesFileModifiedTime', $routesFileModifiedTime, Duration::MONTH);
}
if ($this->lock->isLocked('getCachedDispatchData')) {
$this->lock->release('getCachedDispatchData');
}
return $routerDispatchData;
}
}