Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 

298 lines
8.4 KiB

<?php
/**
* @file src/Core/System.php
*/
namespace Friendica\Core;
use Friendica\BaseObject;
use Friendica\Core\Logger;
use Friendica\Core\Renderer;
use Friendica\Network\HTTPException\InternalServerErrorException;
use Friendica\Util\XML;
/**
* @file include/Core/System.php
*
* @brief Contains the class with system relevant stuff
*/
/**
* @brief System methods
*/
class System extends BaseObject
{
/**
* @brief Retrieves the Friendica instance base URL
*
* @param bool $ssl Whether to append http or https under SSL_POLICY_SELFSIGN
* @return string Friendica server base URL
*/
public static function baseUrl($ssl = false)
{
return self::getApp()->getBaseURL($ssl);
}
/**
* @brief Removes the baseurl from an url. This avoids some mixed content problems.
*
* @param string $orig_url The url to be cleaned
*
* @return string The cleaned url
*/
public static function removedBaseUrl($orig_url)
{
return self::getApp()->removeBaseURL($orig_url);
}
/**
* @brief Returns a string with a callstack. Can be used for logging.
* @param integer $depth optional, default 4
* @return string
*/
public static function callstack($depth = 4)
{
$trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
// We remove the first two items from the list since they contain data that we don't need.
array_shift($trace);
array_shift($trace);
$callstack = [];
$counter = 0;
$previous = ['class' => '', 'function' => ''];
// The ignore list contains all functions that are only wrapper functions
$ignore = ['fetchUrl', 'call_user_func_array'];
while ($func = array_pop($trace)) {
if (!empty($func['class'])) {
// Don't show multiple calls from the "dba" class to show the essential parts of the callstack
if ((($previous['class'] != $func['class']) || ($func['class'] != 'Friendica\Database\DBA')) && ($previous['function'] != 'q')) {
$classparts = explode("\\", $func['class']);
$callstack[] = array_pop($classparts).'::'.$func['function'];
$previous = $func;
}
} elseif (!in_array($func['function'], $ignore)) {
$callstack[] = $func['function'];
$func['class'] = '';
$previous = $func;
}
}
$callstack2 = [];
while ((count($callstack2) < $depth) && (count($callstack) > 0)) {
$callstack2[] = array_pop($callstack);
}
return implode(', ', $callstack2);
}
/**
* Generic XML return
* Outputs a basic dfrn XML status structure to STDOUT, with a <status> variable
* of $st and an optional text <message> of $message and terminates the current process.
*/
public static function xmlExit($st, $message = '')
{
$result = ['status' => $st];
if ($message != '') {
$result['message'] = $message;
}
if ($st) {
Logger::log('xml_status returning non_zero: ' . $st . " message=" . $message);
}
header("Content-type: text/xml");
$xmldata = ["result" => $result];
echo XML::fromArray($xmldata, $xml);
killme();
}
/**
* @brief Send HTTP status header and exit.
*
* @param integer $val HTTP status result value
* @param array $description optional message
* 'title' => header title
* 'description' => optional message
*/
public static function httpExit($val, $description = [])
{
$err = '';
if ($val >= 400) {
if (!empty($description['title'])) {
$err = $description['title'];
} else {
$title = [
'400' => L10n::t('Error 400 - Bad Request'),
'401' => L10n::t('Error 401 - Unauthorized'),
'403' => L10n::t('Error 403 - Forbidden'),
'404' => L10n::t('Error 404 - Not Found'),
'500' => L10n::t('Error 500 - Internal Server Error'),
'503' => L10n::t('Error 503 - Service Unavailable'),
];
$err = defaults($title, $val, 'Error ' . $val);
$description['title'] = $err;
}
if (empty($description['description'])) {
// Explanations are taken from https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
$explanation = [
'400' => L10n::t('The server cannot or will not process the request due to an apparent client error.'),
'401' => L10n::t('Authentication is required and has failed or has not yet been provided.'),
'403' => L10n::t('The request was valid, but the server is refusing action. The user might not have the necessary permissions for a resource, or may need an account.'),
'404' => L10n::t('The requested resource could not be found but may be available in the future.'),
'500' => L10n::t('An unexpected condition was encountered and no more specific message is suitable.'),
'503' => L10n::t('The server is currently unavailable (because it is overloaded or down for maintenance). Please try again later.'),
];
if (!empty($explanation[$val])) {
$description['description'] = $explanation[$val];
}
}
}
if ($val >= 200 && $val < 300) {
$err = 'OK';
}
Logger::log('http_status_exit ' . $val);
header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err);
if (isset($description["title"])) {
$tpl = Renderer::getMarkupTemplate('http_status.tpl');
echo Renderer::replaceMacros($tpl, ['$title' => $description["title"],
'$description' => defaults($description, 'description', '')]);
}
exit();
}
/**
* @brief Encodes content to json.
*
* This function encodes an array to json format
* and adds an application/json HTTP header to the output.
* After finishing the process is getting killed.
*
* @param array $x The input content.
* @param string $content_type Type of the input (Default: 'application/json').
*/
public static function jsonExit($x, $content_type = 'application/json') {
header("Content-type: $content_type");
echo json_encode($x);
killme();
}
/**
* Generates a random string in the UUID format
*
* @param bool|string $prefix A given prefix (default is empty)
* @return string a generated UUID
*/
public static function createUUID($prefix = '')
{
$guid = System::createGUID(32, $prefix);
return substr($guid, 0, 8). '-' . substr($guid, 8, 4) . '-' . substr($guid, 12, 4) . '-' . substr($guid, 16, 4) . '-' . substr($guid, 20, 12);
}
/**
* Generates a GUID with the given parameters
*
* @param int $size The size of the GUID (default is 16)
* @param bool|string $prefix A given prefix (default is empty)
* @return string a generated GUID
*/
public static function createGUID($size = 16, $prefix = '')
{
if (is_bool($prefix) && !$prefix) {
$prefix = '';
} elseif (empty($prefix)) {
$prefix = hash('crc32', self::getApp()->getHostName());
}
while (strlen($prefix) < ($size - 13)) {
$prefix .= mt_rand();
}
if ($size >= 24) {
$prefix = substr($prefix, 0, $size - 22);
return str_replace('.', '', uniqid($prefix, true));
} else {
$prefix = substr($prefix, 0, max($size - 13, 0));
return uniqid($prefix);
}
}
/**
* Generates a process identifier for the logging
*
* @param string $prefix A given prefix
*
* @return string a generated process identifier
*/
public static function processID($prefix)
{
// We aren't calling any other function here.
// Doing so could easily create an endless loop
$trailer = $prefix . ':' . getmypid() . ':';
return substr($trailer . uniqid('') . mt_rand(), 0, 26);
}
/**
* Returns the current Load of the System
*
* @return integer
*/
public static function currentLoad()
{
if (!function_exists('sys_getloadavg')) {
return false;
}
$load_arr = sys_getloadavg();
if (!is_array($load_arr)) {
return false;
}
return max($load_arr[0], $load_arr[1]);
}
/**
* Redirects to an external URL (fully qualified URL)
* If you want to route relative to the current Friendica base, use App->internalRedirect()
*
* @param string $url The new Location to redirect
* @throws InternalServerErrorException If the URL is not fully qualified
*/
public static function externalRedirect($url)
{
if (empty(parse_url($url, PHP_URL_SCHEME))) {
throw new InternalServerErrorException("'$url' is not a fully qualified URL, please use App->internalRedirect() instead");
}
header("Location: $url");
exit();
}
/// @todo Move the following functions from boot.php
/*
function killme()
function local_user()
function public_contact()
function remote_user()
function notice($s)
function info($s)
function is_site_admin()
function get_server()
function get_temppath()
function get_cachefile($file, $writemode = true)
function get_itemcachepath()
function get_spoolpath()
*/
}