friendica/src/BaseModule.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;
use Friendica\App\Router;
use Friendica\Capabilities\ICanHandleRequests;
use Friendica\Core\L10n;
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use Friendica\Core\Logger;
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use Friendica\Model\User;
use Friendica\Module\HTTPException\PageNotFound;
use Friendica\Network\HTTPException\NoContentException;
use Friendica\Util\Profiler;
use Psr\Log\LoggerInterface;
/**
* All modules in Friendica should extend BaseModule, although not all modules
* need to extend all the methods described here
*
* The filename of the module in src/Module needs to match the class name
* exactly to make the module available.
*
* @author Hypolite Petovan <hypolite@mrpetovan.com>
*/
abstract class BaseModule implements ICanHandleRequests
{
/** @var array */
protected $parameters = [];
/** @var L10n */
protected $l10n;
public function __construct(L10n $l10n, array $parameters = [])
{
$this->parameters = $parameters;
$this->l10n = $l10n;
}
/**
* Wraps the L10n::t() function for Modules
*
* @see L10n::t()
*/
protected function t(string $s, ...$args): string
{
return $this->l10n->t($s, ...$args);
}
/**
* Wraps the L10n::tt() function for Modules
*
* @see L10n::tt()
*/
protected function tt(string $singular, string $plurarl, int $count): string
{
return $this->l10n->tt($singular, $plurarl, $count);
}
/**
* {@inheritDoc}
*/
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public function rawContent()
{
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// echo '';
// exit;
}
/**
* {@inheritDoc}
*/
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public function content(): string
{
return '';
}
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/**
* {@inheritDoc}
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*/
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public function delete()
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{
}
/**
* {@inheritDoc}
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*/
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public function patch()
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{
}
/**
* {@inheritDoc}
*/
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public function post()
{
// DI::baseurl()->redirect('module');
}
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/**
* {@inheritDoc}
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*/
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public function put()
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{
}
/** Gets the name of the current class */
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public function getClassName(): string
{
return static::class;
}
public function run(App\BaseURL $baseUrl, App\Arguments $args, LoggerInterface $logger, Profiler $profiler, array $server, array $post)
{
/* 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 (static::class === 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');
$timestamp = microtime(true);
Core\Hook::callAll($args->getModuleName() . '_mod_init', $placeholder);
$profiler->set(microtime(true) - $timestamp, 'init');
if ($server['REQUEST_METHOD'] === Router::DELETE) {
$this->delete();
}
if ($server['REQUEST_METHOD'] === Router::PATCH) {
$this->patch();
}
if ($server['REQUEST_METHOD'] === Router::POST) {
Core\Hook::callAll($args->getModuleName() . '_mod_post', $post);
$this->post();
}
if ($server['REQUEST_METHOD'] === Router::PUT) {
$this->put();
}
// "rawContent" is especially meant for technical endpoints.
// This endpoint doesn't need any theme initialization or other comparable stuff.
$this->rawContent();
}
/*
* Functions used to protect against Cross-Site Request Forgery
* The security token has to base on at least one value that an attacker can't know - here it's the session ID and the private key.
* In this implementation, a security token is reusable (if the user submits a form, goes back and resubmits the form, maybe with small changes;
* or if the security token is used for ajax-calls that happen several times), but only valid for a certain amount of time (3hours).
* The "typename" separates the security tokens of different types of forms. This could be relevant in the following case:
* A security token is used to protect a link from CSRF (e.g. the "delete this profile"-link).
* If the new page contains by any chance external elements, then the used security token is exposed by the referrer.
* Actually, important actions should not be triggered by Links / GET-Requests at all, but sometimes they still are,
* so this mechanism brings in some damage control (the attacker would be able to forge a request to a form of this type, but not to forms of other types).
*/
public static function getFormSecurityToken($typename = '')
{
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$user = User::getById(DI::app()->getLoggedInUserId(), ['guid', 'prvkey']);
$timestamp = time();
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$sec_hash = hash('whirlpool', ($user['guid'] ?? '') . ($user['prvkey'] ?? '') . session_id() . $timestamp . $typename);
return $timestamp . '.' . $sec_hash;
}
public static function checkFormSecurityToken($typename = '', $formname = 'form_security_token')
{
$hash = null;
if (!empty($_REQUEST[$formname])) {
/// @TODO Careful, not secured!
$hash = $_REQUEST[$formname];
}
if (!empty($_SERVER['HTTP_X_CSRF_TOKEN'])) {
/// @TODO Careful, not secured!
$hash = $_SERVER['HTTP_X_CSRF_TOKEN'];
}
if (empty($hash)) {
return false;
}
$max_livetime = 10800; // 3 hours
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$user = User::getById(DI::app()->getLoggedInUserId(), ['guid', 'prvkey']);
$x = explode('.', $hash);
if (time() > (intval($x[0]) + $max_livetime)) {
return false;
}
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$sec_hash = hash('whirlpool', ($user['guid'] ?? '') . ($user['prvkey'] ?? '') . session_id() . $x[0] . $typename);
return ($sec_hash == $x[1]);
}
public static function getFormSecurityStandardErrorMessage()
{
return DI::l10n()->t("The form security token was not correct. This probably happened because the form has been opened for too long \x28>3 hours\x29 before submitting it.") . EOL;
}
public static function checkFormSecurityTokenRedirectOnError($err_redirect, $typename = '', $formname = 'form_security_token')
{
if (!self::checkFormSecurityToken($typename, $formname)) {
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Logger::notice('checkFormSecurityToken failed: user ' . DI::app()->getLoggedInUserNickname() . ' - form element ' . $typename);
Logger::debug('checkFormSecurityToken failed', ['request' => $_REQUEST]);
notice(self::getFormSecurityStandardErrorMessage());
DI::baseUrl()->redirect($err_redirect);
}
}
public static function checkFormSecurityTokenForbiddenOnError($typename = '', $formname = 'form_security_token')
{
if (!self::checkFormSecurityToken($typename, $formname)) {
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Logger::notice('checkFormSecurityToken failed: user ' . DI::app()->getLoggedInUserNickname() . ' - form element ' . $typename);
Logger::debug('checkFormSecurityToken failed', ['request' => $_REQUEST]);
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throw new \Friendica\Network\HTTPException\ForbiddenException();
}
}
protected static function getContactFilterTabs(string $baseUrl, string $current, bool $displayCommonTab)
{
$tabs = [
[
'label' => DI::l10n()->t('All contacts'),
'url' => $baseUrl . '/contacts',
'sel' => !$current || $current == 'all' ? 'active' : '',
],
[
'label' => DI::l10n()->t('Followers'),
'url' => $baseUrl . '/contacts/followers',
'sel' => $current == 'followers' ? 'active' : '',
],
[
'label' => DI::l10n()->t('Following'),
'url' => $baseUrl . '/contacts/following',
'sel' => $current == 'following' ? 'active' : '',
],
[
'label' => DI::l10n()->t('Mutual friends'),
'url' => $baseUrl . '/contacts/mutuals',
'sel' => $current == 'mutuals' ? 'active' : '',
],
];
if ($displayCommonTab) {
$tabs[] = [
'label' => DI::l10n()->t('Common'),
'url' => $baseUrl . '/contacts/common',
'sel' => $current == 'common' ? 'active' : '',
];
}
return $tabs;
}
}