friendica/src/BaseModule.php

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<?php
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/**
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* @copyright Copyright (C) 2010-2023, 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;
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use Friendica\Capabilities\ICanCreateResponses;
use Friendica\Core\Hook;
use Friendica\Core\L10n;
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use Friendica\Core\Logger;
use Friendica\Core\System;
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use Friendica\Model\User;
use Friendica\Module\Response;
use Friendica\Module\Special\HTTPException as ModuleHTTPException;
use Friendica\Network\HTTPException;
use Friendica\Util\Profiler;
use Psr\Http\Message\ResponseInterface;
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;
/** @var App\BaseURL */
protected $baseUrl;
/** @var App\Arguments */
protected $args;
/** @var LoggerInterface */
protected $logger;
/** @var Profiler */
protected $profiler;
/** @var array */
protected $server;
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/** @var ICanCreateResponses */
protected $response;
public function __construct(L10n $l10n, App\BaseURL $baseUrl, App\Arguments $args, LoggerInterface $logger, Profiler $profiler, Response $response, array $server, array $parameters = [])
{
$this->parameters = $parameters;
$this->l10n = $l10n;
$this->baseUrl = $baseUrl;
$this->args = $args;
$this->logger = $logger;
$this->profiler = $profiler;
$this->server = $server;
$this->response = $response;
}
/**
* 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 $plural, int $count): string
{
return $this->l10n->tt($singular, $plural, $count);
}
/**
* Module GET method to display raw content from technical endpoints
*
* Extend this method if the module is supposed to return communication data,
* e.g. from protocol implementations.
*
* @param string[] $request The $_REQUEST content
* @return void
*/
protected function rawContent(array $request = [])
{
// $this->httpExit(...);
}
/**
* Module GET method to display any content
*
* Extend this method if the module is supposed to return any display
* through a GET request. It can be an HTML page through templating or a
* XML feed or a JSON output.
*
* @param string[] $request The $_REQUEST content
* @return string
*/
protected function content(array $request = []): string
{
return '';
}
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/**
* Module DELETE method to process submitted data
*
* Extend this method if the module is supposed to process DELETE requests.
* Doesn't display any content
*
* @param string[] $request The $_REQUEST content
* @return void
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*/
protected function delete(array $request = [])
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{
}
/**
* Module PATCH method to process submitted data
*
* Extend this method if the module is supposed to process PATCH requests.
* Doesn't display any content
*
* @param string[] $request The $_REQUEST content
* @return void
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*/
protected function patch(array $request = [])
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{
}
/**
* Module POST method to process submitted data
*
* Extend this method if the module is supposed to process POST requests.
* Doesn't display any content
*
* @param string[] $request The $_REQUEST content
* @return void
*/
protected function post(array $request = [])
{
// $this->baseUrl->redirect('module');
}
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/**
* Module PUT method to process submitted data
*
* Extend this method if the module is supposed to process PUT requests.
* Doesn't display any content
*
* @param string[] $request The $_REQUEST content
* @return void
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*/
protected function put(array $request = [])
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{
}
/**
* {@inheritDoc}
*/
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public function run(ModuleHTTPException $httpException, array $request = []): ResponseInterface
{
// @see https://github.com/tootsuite/mastodon/blob/c3aef491d66aec743a3a53e934a494f653745b61/config/initializers/cors.rb
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if (substr($this->args->getQueryString(), 0, 12) == '.well-known/') {
$this->response->setHeader('*', 'Access-Control-Allow-Origin');
$this->response->setHeader('*', 'Access-Control-Allow-Headers');
$this->response->setHeader(Router::GET, 'Access-Control-Allow-Methods');
$this->response->setHeader('false', 'Access-Control-Allow-Credentials');
} elseif (substr($this->args->getQueryString(), 0, 9) == 'nodeinfo/') {
$this->response->setHeader('*', 'Access-Control-Allow-Origin');
$this->response->setHeader('*', 'Access-Control-Allow-Headers');
$this->response->setHeader(Router::GET, 'Access-Control-Allow-Methods');
$this->response->setHeader('false', 'Access-Control-Allow-Credentials');
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} elseif (substr($this->args->getQueryString(), 0, 8) == 'profile/') {
$this->response->setHeader('*', 'Access-Control-Allow-Origin');
$this->response->setHeader('*', 'Access-Control-Allow-Headers');
$this->response->setHeader(Router::GET, 'Access-Control-Allow-Methods');
$this->response->setHeader('false', 'Access-Control-Allow-Credentials');
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} elseif (substr($this->args->getQueryString(), 0, 4) == 'api/') {
$this->response->setHeader('*', 'Access-Control-Allow-Origin');
$this->response->setHeader('*', 'Access-Control-Allow-Headers');
$this->response->setHeader(implode(',', Router::ALLOWED_METHODS), 'Access-Control-Allow-Methods');
$this->response->setHeader('false', 'Access-Control-Allow-Credentials');
$this->response->setHeader('Link', 'Access-Control-Expose-Headers');
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} elseif (substr($this->args->getQueryString(), 0, 11) == 'oauth/token') {
$this->response->setHeader('*', 'Access-Control-Allow-Origin');
$this->response->setHeader('*', 'Access-Control-Allow-Headers');
$this->response->setHeader(Router::POST, 'Access-Control-Allow-Methods');
$this->response->setHeader('false', 'Access-Control-Allow-Credentials');
}
$placeholder = '';
$this->profiler->set(microtime(true), 'ready');
$timestamp = microtime(true);
Core\Hook::callAll($this->args->getModuleName() . '_mod_init', $placeholder);
$this->profiler->set(microtime(true) - $timestamp, 'init');
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switch ($this->args->getMethod()) {
case Router::DELETE:
$this->delete($request);
break;
case Router::PATCH:
$this->patch($request);
break;
case Router::POST:
Core\Hook::callAll($this->args->getModuleName() . '_mod_post', $request);
$this->post($request);
break;
case Router::PUT:
$this->put($request);
break;
}
$timestamp = microtime(true);
// "rawContent" is especially meant for technical endpoints.
// This endpoint doesn't need any theme initialization or
// templating and is expected to exit on its own if it is set.
$this->rawContent($request);
try {
$arr = ['content' => ''];
Hook::callAll(static::class . '_mod_content', $arr);
$this->response->addContent($arr['content']);
$this->response->addContent($this->content($request));
} catch (HTTPException $e) {
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// In case of System::externalRedirects(), we don't want to prettyprint the exception
// just redirect to the new location
if (($e instanceof HTTPException\FoundException) ||
($e instanceof HTTPException\MovedPermanentlyException) ||
($e instanceof HTTPException\TemporaryRedirectException)) {
throw $e;
}
$this->response->setStatus($e->getCode(), $e->getMessage());
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$this->response->addContent($httpException->content($e));
} finally {
$this->profiler->set(microtime(true) - $timestamp, 'content');
}
return $this->response->generate();
}
/**
* Checks request inputs and sets default parameters
*
* @param array $defaults Associative array of expected request keys and their default typed value. A null
* value will remove the request key from the resulting value array.
* @param array $input Custom REQUEST array, superglobal instead
*
* @return array Request data
*/
protected function checkDefaults(array $defaults, array $input): array
{
$request = [];
foreach ($defaults as $parameter => $defaultvalue) {
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$request[$parameter] = $this->getRequestValue($input, $parameter, $defaultvalue);
}
foreach ($input ?? [] as $parameter => $value) {
if ($parameter == 'pagename') {
continue;
}
if (!in_array($parameter, array_keys($defaults))) {
$this->logger->notice('Unhandled request field', ['parameter' => $parameter, 'value' => $value, 'command' => $this->args->getCommand()]);
}
}
$this->logger->debug('Got request parameters', ['request' => $request, 'command' => $this->args->getCommand()]);
return $request;
}
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/**
* Fetch a request value and apply default values and check against minimal and maximal values
*
* @param array $input Input fields
* @param string $parameter Parameter
* @param mixed $default Default
* @param mixed $minimal_value Minimal value
* @param mixed $maximum_value Maximum value
* @return mixed null on error anything else on success (?)
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*/
public function getRequestValue(array $input, string $parameter, $default = null, $minimal_value = null, $maximum_value = null)
{
if (is_string($default)) {
$value = (string)($input[$parameter] ?? $default);
} elseif (is_int($default)) {
$value = filter_var($input[$parameter] ?? $default, FILTER_VALIDATE_INT);
if (!is_null($minimal_value)) {
$value = max(filter_var($minimal_value, FILTER_VALIDATE_INT), $value);
}
if (!is_null($maximum_value)) {
$value = min(filter_var($maximum_value, FILTER_VALIDATE_INT), $value);
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}
} elseif (is_float($default)) {
$value = filter_var($input[$parameter] ?? $default, FILTER_VALIDATE_FLOAT);
if (!is_null($minimal_value)) {
$value = max(filter_var($minimal_value, FILTER_VALIDATE_FLOAT), $value);
}
if (!is_null($maximum_value)) {
$value = min(filter_var($maximum_value, FILTER_VALIDATE_FLOAT), $value);
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}
} elseif (is_array($default)) {
$value = filter_var($input[$parameter] ?? $default, FILTER_DEFAULT, ['flags' => FILTER_FORCE_ARRAY]);
} elseif (is_bool($default)) {
$value = filter_var($input[$parameter] ?? $default, FILTER_VALIDATE_BOOLEAN);
} elseif (is_null($default)) {
$value = $input[$parameter] ?? null;
} else {
$this->logger->notice('Unhandled default value type', ['parameter' => $parameter, 'type' => gettype($default)]);
$value = null;
}
return $value;
}
/**
* 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).
*
* @param string $typename Type name
* @return string Security hash with timestamp
*/
public static function getFormSecurityToken(string $typename = ''): string
{
$user = User::getById(DI::app()->getLoggedInUserId(), ['guid', 'prvkey']);
$timestamp = time();
$sec_hash = hash('whirlpool', ($user['guid'] ?? '') . ($user['prvkey'] ?? '') . session_id() . $timestamp . $typename);
return $timestamp . '.' . $sec_hash;
}
/**
* Checks if form's security (CSRF) token is valid.
*
* @param string $typename ???
* @param string $formname Name of form/field (???)
* @return bool Whether it is valid
*/
public static function checkFormSecurityToken(string $typename = '', string $formname = 'form_security_token'): bool
{
$hash = null;
if (!empty($_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(): string
{
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.");
}
public static function checkFormSecurityTokenRedirectOnError(string $err_redirect, string $typename = '', string $formname = 'form_security_token')
{
if (!self::checkFormSecurityToken($typename, $formname)) {
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Logger::notice('checkFormSecurityToken failed: user ' . DI::app()->getLoggedInUserNickname() . ' - form element ' . $typename);
Logger::debug('checkFormSecurityToken failed', ['request' => $_REQUEST]);
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DI::sysmsg()->addNotice(self::getFormSecurityStandardErrorMessage());
DI::baseUrl()->redirect($err_redirect);
}
}
public static function checkFormSecurityTokenForbiddenOnError(string $typename = '', string $formname = 'form_security_token')
{
if (!self::checkFormSecurityToken($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): array
{
$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;
}
/**
* This function adds the content and a content-type HTTP header to the output.
* After finishing the process is getting killed.
*
* @param string $content
* @param string $type
* @param string|null $content_type
* @return void
* @throws HTTPException\InternalServerErrorException
*/
public function httpExit(string $content, string $type = Response::TYPE_HTML, ?string $content_type = null)
{
$this->response->setType($type, $content_type);
$this->response->addContent($content);
System::echoResponse($this->response->generate());
System::exit();
}
/**
* Send HTTP status header and exit.
*
* @param integer $httpCode HTTP status result value
* @param string $message Error message. Optional.
* @param mixed $content Response body. Optional.
* @throws \Exception
*/
public function httpError(int $httpCode, string $message = '', $content = '')
{
if ($httpCode >= 400) {
$this->logger->debug('Exit with error', ['code' => $httpCode, 'message' => $message, 'method' => $this->args->getMethod(), 'agent' => $this->server['HTTP_USER_AGENT'] ?? '']);
}
$this->response->setStatus($httpCode, $message);
$this->httpExit($content);
}
/**
* Display the response using JSON to encode the content
*
* @param mixed $content
* @param string $content_type
* @param int $options A combination of json_encode() binary flags
* @return void
* @throws HTTPException\InternalServerErrorException
* @see json_encode()
*/
public function jsonExit($content, string $content_type = 'application/json', int $options = JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT)
{
$this->httpExit(json_encode($content, $options), ICanCreateResponses::TYPE_JSON, $content_type);
}
/**
* Display a non-200 HTTP code response using JSON to encode the content and exit
*
* @param int $httpCode
* @param mixed $content
* @param string $content_type
* @return void
* @throws HTTPException\InternalServerErrorException
*/
public function jsonError(int $httpCode, $content, string $content_type = 'application/json')
{
if ($httpCode >= 400) {
$this->logger->debug('Exit with error', ['code' => $httpCode, 'content_type' => $content_type, 'method' => $this->args->getMethod(), 'agent' => $this->server['HTTP_USER_AGENT'] ?? '']);
}
$this->response->setStatus($httpCode);
$this->jsonExit($content, $content_type);
}
}