327 lines
8.7 KiB
PHP
327 lines
8.7 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2020, Friendica
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Core;
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use Friendica\DI;
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use Friendica\Network\HTTPException\InternalServerErrorException;
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use Friendica\Util\XML;
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/**
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* Contains the class with system relevant stuff
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*/
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class System
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{
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/**
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* Returns a string with a callstack. Can be used for logging.
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*
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* @param integer $depth optional, default 4
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* @return string
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*/
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public static function callstack($depth = 4)
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{
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$trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
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// We remove the first two items from the list since they contain data that we don't need.
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array_shift($trace);
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array_shift($trace);
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$callstack = [];
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$previous = ['class' => '', 'function' => ''];
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// The ignore list contains all functions that are only wrapper functions
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$ignore = ['fetchUrl', 'call_user_func_array'];
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while ($func = array_pop($trace)) {
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if (!empty($func['class'])) {
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// Don't show multiple calls from the "dba" class to show the essential parts of the callstack
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if ((($previous['class'] != $func['class']) || ($func['class'] != 'Friendica\Database\DBA')) && ($previous['function'] != 'q')) {
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$classparts = explode("\\", $func['class']);
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$callstack[] = array_pop($classparts).'::'.$func['function'];
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$previous = $func;
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}
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} elseif (!in_array($func['function'], $ignore)) {
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$callstack[] = $func['function'];
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$func['class'] = '';
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$previous = $func;
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}
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}
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$callstack2 = [];
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while ((count($callstack2) < $depth) && (count($callstack) > 0)) {
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$callstack2[] = array_pop($callstack);
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}
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return implode(', ', $callstack2);
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}
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/**
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* Generic XML return
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* Outputs a basic dfrn XML status structure to STDOUT, with a <status> variable
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* of $st and an optional text <message> of $message and terminates the current process.
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*
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* @param $st
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* @param string $message
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* @throws \Exception
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*/
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public static function xmlExit($st, $message = '')
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{
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$result = ['status' => $st];
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if ($message != '') {
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$result['message'] = $message;
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}
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if ($st) {
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Logger::log('xml_status returning non_zero: ' . $st . " message=" . $message);
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}
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header("Content-type: text/xml");
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$xmldata = ["result" => $result];
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echo XML::fromArray($xmldata, $xml);
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exit();
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}
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/**
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* Send HTTP status header and exit.
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*
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* @param integer $val HTTP status result value
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* @param string $message Error message. Optional.
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* @param string $content Response body. Optional.
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* @throws \Exception
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*/
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public static function httpExit($val, $message = '', $content = '')
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{
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Logger::log('http_status_exit ' . $val);
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header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $message);
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echo $content;
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exit();
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}
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public static function jsonError($httpCode, $data, $content_type = 'application/json')
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{
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header($_SERVER["SERVER_PROTOCOL"] . ' ' . $httpCode);
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self::jsonExit($data, $content_type);
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}
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/**
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* Encodes content to json.
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*
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* This function encodes an array to json format
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* and adds an application/json HTTP header to the output.
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* After finishing the process is getting killed.
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*
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* @param mixed $x The input content.
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* @param string $content_type Type of the input (Default: 'application/json').
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*/
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public static function jsonExit($x, $content_type = 'application/json') {
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header("Content-type: $content_type");
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echo json_encode($x);
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exit();
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}
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/**
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* Generates a random string in the UUID format
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*
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* @param bool|string $prefix A given prefix (default is empty)
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* @return string a generated UUID
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* @throws \Exception
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*/
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public static function createUUID($prefix = '')
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{
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$guid = System::createGUID(32, $prefix);
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return substr($guid, 0, 8) . '-' . substr($guid, 8, 4) . '-' . substr($guid, 12, 4) . '-' . substr($guid, 16, 4) . '-' . substr($guid, 20, 12);
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}
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/**
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* Generates a GUID with the given parameters
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*
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* @param int $size The size of the GUID (default is 16)
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* @param bool|string $prefix A given prefix (default is empty)
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* @return string a generated GUID
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* @throws \Exception
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*/
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public static function createGUID($size = 16, $prefix = '')
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{
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if (is_bool($prefix) && !$prefix) {
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$prefix = '';
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} elseif (empty($prefix)) {
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$prefix = hash('crc32', DI::baseUrl()->getHostname());
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}
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while (strlen($prefix) < ($size - 13)) {
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$prefix .= mt_rand();
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}
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if ($size >= 24) {
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$prefix = substr($prefix, 0, $size - 22);
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return str_replace('.', '', uniqid($prefix, true));
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} else {
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$prefix = substr($prefix, 0, max($size - 13, 0));
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return uniqid($prefix);
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}
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}
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/**
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* Returns the current Load of the System
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*
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* @return integer
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*/
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public static function currentLoad()
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{
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if (!function_exists('sys_getloadavg')) {
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return false;
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}
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$load_arr = sys_getloadavg();
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if (!is_array($load_arr)) {
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return false;
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}
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return max($load_arr[0], $load_arr[1]);
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}
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/**
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* Redirects to an external URL (fully qualified URL)
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* If you want to route relative to the current Friendica base, use App->internalRedirect()
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*
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* @param string $url The new Location to redirect
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* @param int $code The redirection code, which is used (Default is 302)
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*
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* @throws InternalServerErrorException If the URL is not fully qualified
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*/
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public static function externalRedirect($url, $code = 302)
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{
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if (empty(parse_url($url, PHP_URL_SCHEME))) {
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throw new InternalServerErrorException("'$url' is not a fully qualified URL, please use App->internalRedirect() instead");
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}
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switch ($code) {
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case 302:
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// this is the default code for a REDIRECT
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// We don't need a extra header here
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break;
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case 301:
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header('HTTP/1.1 301 Moved Permanently');
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break;
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case 307:
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header('HTTP/1.1 307 Temporary Redirect');
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break;
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}
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header("Location: $url");
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exit();
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}
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/**
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* Returns the system user that is executing the script
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*
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* This mostly returns something like "www-data".
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*
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* @return string system username
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*/
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public static function getUser()
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{
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if (!function_exists('posix_getpwuid') || !function_exists('posix_geteuid')) {
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return '';
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}
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$processUser = posix_getpwuid(posix_geteuid());
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return $processUser['name'];
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}
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/**
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* Checks if a given directory is usable for the system
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*
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* @param $directory
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* @param bool $check_writable
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*
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* @return boolean the directory is usable
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*/
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public static function isDirectoryUsable($directory, $check_writable = true)
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{
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if ($directory == '') {
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Logger::log('Directory is empty. This shouldn\'t happen.', Logger::DEBUG);
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return false;
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}
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if (!file_exists($directory)) {
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Logger::log('Path "' . $directory . '" does not exist for user ' . static::getUser(), Logger::DEBUG);
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return false;
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}
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if (is_file($directory)) {
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Logger::log('Path "' . $directory . '" is a file for user ' . static::getUser(), Logger::DEBUG);
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return false;
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}
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if (!is_dir($directory)) {
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Logger::log('Path "' . $directory . '" is not a directory for user ' . static::getUser(), Logger::DEBUG);
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return false;
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}
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if ($check_writable && !is_writable($directory)) {
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Logger::log('Path "' . $directory . '" is not writable for user ' . static::getUser(), Logger::DEBUG);
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return false;
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}
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return true;
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}
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/**
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* Exit method used by asynchronous update modules
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*
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* @param string $o
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*/
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public static function htmlUpdateExit($o)
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{
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header("Content-type: text/html");
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echo "<!DOCTYPE html><html><body>\r\n";
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// We can remove this hack once Internet Explorer recognises HTML5 natively
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echo "<section>";
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// reportedly some versions of MSIE don't handle tabs in XMLHttpRequest documents very well
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echo str_replace("\t", " ", $o);
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echo "</section>";
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echo "</body></html>\r\n";
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exit();
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}
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/// @todo Move the following functions from boot.php
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/*
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function local_user()
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function public_contact()
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function remote_user()
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function notice($s)
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function info($s)
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function is_site_admin()
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function get_temppath()
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function get_cachefile($file, $writemode = true)
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function get_itemcachepath()
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function get_spoolpath()
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*/
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}
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