<?php
/**
* @copyright Copyright (C) 2010-2021, the Friendica project
*
* @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 Dice\Dice;
use Friendica\App;
use Friendica\Capabilities\ICanHandleRequests;
use Friendica\Core;
use Friendica\Core\Config\Capability\IManageConfigValues;
use Friendica\LegacyModule;
use Friendica\Module\Home;
use Friendica\Module\HTTPException\MethodNotAllowed;
use Friendica\Module\HTTPException\PageNotFound;
use Friendica\Network\HTTPException\MethodNotAllowedException;
use Friendica\Network\HTTPException\NoContentException;
use Friendica\Network\HTTPException\NotFoundException;
use Friendica\Util\Profiler;
use Psr\Log\LoggerInterface;
/**
* Holds the common context of the current, loaded module
*/
class ModuleController
{
const DEFAULT = 'home';
const DEFAULT_CLASS = Home::class;
/**
* A list of modules, which are backend methods
*
* @var array
*/
const BACKEND_MODULES = [
'_well_known',
'api',
'dfrn_notify',
'feed',
'fetch',
'followers',
'following',
'hcard',
'hostxrd',
'inbox',
'manifest',
'nodeinfo',
'noscrape',
'objects',
'outbox',
'poco',
'post',
'pubsub',
'pubsubhubbub',
'receive',
'rsd_xml',
'salmon',
'statistics_json',
'xrd',
];
/**
* @var string The module name
*/
private $moduleName;
/**
* @var ?ICanHandleRequests The module object
*/
private $module;
/**
* @var bool true, if the module is a backend module
*/
private $isBackend;
/**
* @var bool true, if the loaded addon is private, so we have to print out not allowed
*/
private $printNotAllowedAddon;
/**
* @return string
*/
public function getName()
{
return $this->moduleName;
}
/**
* @return ?ICanHandleRequests The base module object
*/
public function getModule(): ?ICanHandleRequests
{
return $this->module;
}
/**
* @return bool True, if the current module is a backend module
* @see ModuleController::BACKEND_MODULES for a list
*/
public function isBackend()
{
return $this->isBackend;
}
public function __construct(string $moduleName = self::DEFAULT, ?ICanHandleRequests $module = null, bool $isBackend = false, bool $printNotAllowedAddon = false)
{
$this->moduleName = $moduleName;
$this->module = $module;
$this->isBackend = $isBackend;
$this->printNotAllowedAddon = $printNotAllowedAddon;
}
/**
* Determines the current module based on the App arguments and the server variable
*
* @param Arguments $args The Friendica arguments
*
* @return ModuleController The module with the determined module
*/
public function determineName(Arguments $args)
{
if ($args->getArgc() > 0) {
$module = str_replace('.', '_', $args->get(0));
$module = str_replace('-', '_', $module);
} else {
$module = self::DEFAULT;
}
// Compatibility with the Firefox App
if (($module == "users") && ($args->getCommand() == "users/sign_in")) {
$module = "login";
}
$isBackend = in_array($module, ModuleController::BACKEND_MODULES);
return new ModuleController($module, null, $isBackend, $this->printNotAllowedAddon);
}
/**
* Determine the class of the current module
*
* @param Arguments $args The Friendica execution arguments
* @param Router $router The Friendica routing instance
* @param IManageConfigValues $config The Friendica Configuration
* @param Dice $dice The Dependency Injection container
*
* @return ModuleController The determined module of this call
*
* @throws \Exception
*/
public function determineClass(Arguments $args, Router $router, IManageConfigValues $config, Dice $dice)
{
$printNotAllowedAddon = false;
$module_class = null;
$module_parameters = [];
/**
* ROUTING
*
* From the request URL, routing consists of obtaining the name of a BaseModule-extending class of which the
* post() and/or content() static methods can be respectively called to produce a data change or an output.
**/
try {
$module_class = $router->getModuleClass($args->getCommand());
$module_parameters[] = $router->getModuleParameters();
} catch (MethodNotAllowedException $e) {
$module_class = MethodNotAllowed::class;
} catch (NotFoundException $e) {
// Then we try addon-provided modules that we wrap in the LegacyModule class
if (Core\Addon::isEnabled($this->moduleName) && file_exists("addon/{$this->moduleName}/{$this->moduleName}.php")) {
//Check if module is an app and if public access to apps is allowed or not
$privateapps = $config->get('config', 'private_addons', false);
if ((!local_user()) && Core\Hook::isAddonApp($this->moduleName) && $privateapps) {
$printNotAllowedAddon = true;
} else {
include_once "addon/{$this->moduleName}/{$this->moduleName}.php";
if (function_exists($this->moduleName . '_module')) {
$module_parameters[] = "addon/{$this->moduleName}/{$this->moduleName}.php";
$module_class = LegacyModule::class;
}
}
}
/* Finally, we look for a 'standard' program module in the 'mod' directory
* We emulate a Module class through the LegacyModule class
*/
if (!$module_class && file_exists("mod/{$this->moduleName}.php")) {
$module_parameters[] = "mod/{$this->moduleName}.php";
$module_class = LegacyModule::class;
}
$module_class = $module_class ?: PageNotFound::class;
}
/** @var ICanHandleRequests $module */
$module = $dice->create($module_class, $module_parameters);
return new ModuleController($this->moduleName, $module, $this->isBackend, $printNotAllowedAddon);
}
/**
* Run the determined module class and calls all hooks applied to
*
* @param \Friendica\Core\L10n $l10n The L10n instance
* @param App\BaseURL $baseUrl The Friendica Base URL
* @param LoggerInterface $logger The Friendica logger
* @param array $server The $_SERVER variable
* @param array $post The $_POST variables
*
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
public function run(Core\L10n $l10n, App\BaseURL $baseUrl, LoggerInterface $logger, Profiler $profiler, array $server, array $post)
{
if ($this->printNotAllowedAddon) {
notice($l10n->t("You must be logged in to use addons. "));
}
/* The URL provided does not resolve to a valid module.
*
* On Dreamhost sites, quite often things go wrong for no apparent reason and they send us to '/internal_error.html'.
* We don't like doing this, but as it occasionally accounts for 10-20% or more of all site traffic -
* we are going to trap this and redirect back to the requested page. As long as you don't have a critical error on your page
* this will often succeed and eventually do the right thing.
*
* Otherwise we are going to emit a 404 not found.
*/
if ($this->module === PageNotFound::class) {
$queryString = $server['QUERY_STRING'];
// Stupid browser tried to pre-fetch our Javascript img template. Don't log the event or return anything - just quietly exit.
if (!empty($queryString) && preg_match('/{[0-9]}/', $queryString) !== 0) {
exit();
}
if (!empty($queryString) && ($queryString === 'q=internal_error.html') && isset($dreamhost_error_hack)) {
$logger->info('index.php: dreamhost_error_hack invoked.', ['Original URI' => $server['REQUEST_URI']]);
$baseUrl->redirect($server['REQUEST_URI']);
}
$logger->debug('index.php: page not found.', ['request_uri' => $server['REQUEST_URI'], 'address' => $server['REMOTE_ADDR'], 'query' => $server['QUERY_STRING']]);
}
// @see https://github.com/tootsuite/mastodon/blob/c3aef491d66aec743a3a53e934a494f653745b61/config/initializers/cors.rb
if (substr($_REQUEST['pagename'] ?? '', 0, 12) == '.well-known/') {
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Headers: *');
header('Access-Control-Allow-Methods: ' . Router::GET);
header('Access-Control-Allow-Credentials: false');
} elseif (substr($_REQUEST['pagename'] ?? '', 0, 8) == 'profile/') {
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Headers: *');
header('Access-Control-Allow-Methods: ' . Router::GET);
header('Access-Control-Allow-Credentials: false');
} elseif (substr($_REQUEST['pagename'] ?? '', 0, 4) == 'api/') {
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Headers: *');
header('Access-Control-Allow-Methods: ' . implode(',', Router::ALLOWED_METHODS));
header('Access-Control-Allow-Credentials: false');
header('Access-Control-Expose-Headers: Link');
} elseif (substr($_REQUEST['pagename'] ?? '', 0, 11) == 'oauth/token') {
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Headers: *');
header('Access-Control-Allow-Methods: ' . Router::POST);
header('Access-Control-Allow-Credentials: false');
}
// @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/OPTIONS
// @todo Check allowed methods per requested path
if ($server['REQUEST_METHOD'] === Router::OPTIONS) {
header('Allow: ' . implode(',', Router::ALLOWED_METHODS));
throw new NoContentException();
}
$placeholder = '';
$profiler->set(microtime(true), 'ready');
$timestamp = microtime(true);
Core\Hook::callAll($this->moduleName . '_mod_init', $placeholder);
$profiler->set(microtime(true) - $timestamp, 'init');
if ($server['REQUEST_METHOD'] === Router::DELETE) {
$this->module->delete();
}
if ($server['REQUEST_METHOD'] === Router::PATCH) {
$this->module->patch();
}
if ($server['REQUEST_METHOD'] === Router::POST) {
Core\Hook::callAll($this->moduleName . '_mod_post', $post);
$this->module->post();
}
if ($server['REQUEST_METHOD'] === Router::PUT) {
$this->module->put();
}
// "rawContent" is especially meant for technical endpoints.
// This endpoint doesn't need any theme initialization or other comparable stuff.
$this->module->rawContent();
}
}