mirror of https://github.com/friendica/friendica
299 lines
8.4 KiB
PHP
299 lines
8.4 KiB
PHP
<?php
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/**
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* @file src/Core/System.php
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*/
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namespace Friendica\Core;
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use Friendica\BaseObject;
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use Friendica\Core\Logger;
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use Friendica\Core\Renderer;
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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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* @file include/Core/System.php
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*
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* @brief Contains the class with system relevant stuff
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*/
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/**
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* @brief System methods
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*/
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class System extends BaseObject
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{
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/**
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* @brief Retrieves the Friendica instance base URL
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*
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* @param bool $ssl Whether to append http or https under SSL_POLICY_SELFSIGN
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* @return string Friendica server base URL
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*/
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public static function baseUrl($ssl = false)
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{
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return self::getApp()->getBaseURL($ssl);
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}
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/**
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* @brief Removes the baseurl from an url. This avoids some mixed content problems.
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*
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* @param string $orig_url The url to be cleaned
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*
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* @return string The cleaned url
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*/
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public static function removedBaseUrl($orig_url)
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{
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return self::getApp()->removeBaseURL($orig_url);
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}
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/**
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* @brief Returns a string with a callstack. Can be used for logging.
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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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$counter = 0;
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$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 $message and terminates the current process.
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*/
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public static function xmlExit($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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killme();
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}
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/**
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* @brief 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 array $description optional message
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* 'title' => header title
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* 'description' => optional message
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*/
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public static function httpExit($val, $description = [])
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{
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$err = '';
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if ($val >= 400) {
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if (!empty($description['title'])) {
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$err = $description['title'];
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} else {
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$title = [
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'400' => L10n::t('Error 400 - Bad Request'),
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'401' => L10n::t('Error 401 - Unauthorized'),
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'403' => L10n::t('Error 403 - Forbidden'),
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'404' => L10n::t('Error 404 - Not Found'),
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'500' => L10n::t('Error 500 - Internal Server Error'),
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'503' => L10n::t('Error 503 - Service Unavailable'),
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];
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$err = defaults($title, $val, 'Error ' . $val);
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$description['title'] = $err;
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}
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if (empty($description['description'])) {
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// Explanations are taken from https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
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$explanation = [
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'400' => L10n::t('The server cannot or will not process the request due to an apparent client error.'),
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'401' => L10n::t('Authentication is required and has failed or has not yet been provided.'),
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'403' => L10n::t('The request was valid, but the server is refusing action. The user might not have the necessary permissions for a resource, or may need an account.'),
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'404' => L10n::t('The requested resource could not be found but may be available in the future.'),
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'500' => L10n::t('An unexpected condition was encountered and no more specific message is suitable.'),
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'503' => L10n::t('The server is currently unavailable (because it is overloaded or down for maintenance). Please try again later.'),
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];
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if (!empty($explanation[$val])) {
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$description['description'] = $explanation[$val];
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}
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}
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}
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if ($val >= 200 && $val < 300) {
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$err = 'OK';
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}
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Logger::log('http_status_exit ' . $val);
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header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err);
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if (isset($description["title"])) {
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$tpl = Renderer::getMarkupTemplate('http_status.tpl');
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echo Renderer::replaceMacros($tpl, ['$title' => $description["title"],
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'$description' => defaults($description, 'description', '')]);
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}
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exit();
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}
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/**
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* @brief 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 array $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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killme();
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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 $prefix A given prefix (default is empty)
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* @return string a generated UUID
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*/
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public static function createUUID($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 $prefix A given prefix (default is empty)
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* @return string a generated GUID
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*/
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public static function createGUID($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', self::getApp()->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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* Generates a process identifier for the logging
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*
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* @param string $prefix A given prefix
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*
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* @return string a generated process identifier
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*/
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public static function processID($prefix)
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{
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// We aren't calling any other function here.
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// Doing so could easily create an endless loop
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$trailer = $prefix . ':' . getmypid() . ':';
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return substr($trailer . uniqid('') . mt_rand(), 0, 26);
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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 $url The new Location to redirect
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* @throws InternalServerErrorException If the URL is not fully qualified
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*/
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public static function externalRedirect($url)
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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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header("Location: $url");
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exit();
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}
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/// @todo Move the following functions from boot.php
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/*
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function killme()
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function local_user()
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function public_contact()
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function remote_user()
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function notice($s)
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function info($s)
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function is_site_admin()
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function get_server()
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function get_temppath()
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function get_cachefile($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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