3 * @copyright Copyright (C) 2020, Friendica
5 * @license GNU AGPL version 3 or any later version
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Affero General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Affero General Public License for more details.
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <https://www.gnu.org/licenses/>.
22 namespace Friendica\Core;
25 use Friendica\Network\HTTPException\InternalServerErrorException;
26 use Friendica\Util\XML;
29 * Contains the class with system relevant stuff
34 * Returns a string with a callstack. Can be used for logging.
36 * @param integer $depth optional, default 4
39 public static function callstack($depth = 4)
41 $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
43 // We remove the first two items from the list since they contain data that we don't need.
48 $previous = ['class' => '', 'function' => '', 'database' => false];
50 // The ignore list contains all functions that are only wrapper functions
51 $ignore = ['fetchUrl', 'call_user_func_array'];
53 while ($func = array_pop($trace)) {
54 if (!empty($func['class'])) {
55 // Don't show multiple calls from the Database classes to show the essential parts of the callstack
56 $func['database'] = in_array($func['class'], ['Friendica\Database\DBA', 'Friendica\Database\Database']);
57 if (!$previous['database'] || !$func['database']) {
58 $classparts = explode("\\", $func['class']);
59 $callstack[] = array_pop($classparts).'::'.$func['function'];
62 } elseif (!in_array($func['function'], $ignore)) {
63 $func['database'] = ($func['function'] == 'q');
64 $callstack[] = $func['function'];
71 while ((count($callstack2) < $depth) && (count($callstack) > 0)) {
72 $callstack2[] = array_pop($callstack);
75 return implode(', ', $callstack2);
80 * Outputs a basic dfrn XML status structure to STDOUT, with a <status> variable
81 * of $st and an optional text <message> of $message and terminates the current process.
84 * @param string $message
87 public static function xmlExit($st, $message = '')
89 $result = ['status' => $st];
92 $result['message'] = $message;
96 Logger::log('xml_status returning non_zero: ' . $st . " message=" . $message);
99 header("Content-type: text/xml");
101 $xmldata = ["result" => $result];
103 echo XML::fromArray($xmldata, $xml);
109 * Send HTTP status header and exit.
111 * @param integer $val HTTP status result value
112 * @param string $message Error message. Optional.
113 * @param string $content Response body. Optional.
116 public static function httpExit($val, $message = '', $content = '')
118 Logger::log('http_status_exit ' . $val);
119 header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $message);
126 public static function jsonError($httpCode, $data, $content_type = 'application/json')
128 header($_SERVER["SERVER_PROTOCOL"] . ' ' . $httpCode);
129 self::jsonExit($data, $content_type);
133 * Encodes content to json.
135 * This function encodes an array to json format
136 * and adds an application/json HTTP header to the output.
137 * After finishing the process is getting killed.
139 * @param mixed $x The input content.
140 * @param string $content_type Type of the input (Default: 'application/json').
142 public static function jsonExit($x, $content_type = 'application/json') {
143 header("Content-type: $content_type");
144 echo json_encode($x);
149 * Generates a random string in the UUID format
151 * @param bool|string $prefix A given prefix (default is empty)
152 * @return string a generated UUID
155 public static function createUUID($prefix = '')
157 $guid = System::createGUID(32, $prefix);
158 return substr($guid, 0, 8) . '-' . substr($guid, 8, 4) . '-' . substr($guid, 12, 4) . '-' . substr($guid, 16, 4) . '-' . substr($guid, 20, 12);
162 * Generates a GUID with the given parameters
164 * @param int $size The size of the GUID (default is 16)
165 * @param bool|string $prefix A given prefix (default is empty)
166 * @return string a generated GUID
169 public static function createGUID($size = 16, $prefix = '')
171 if (is_bool($prefix) && !$prefix) {
173 } elseif (empty($prefix)) {
174 $prefix = hash('crc32', DI::baseUrl()->getHostname());
177 while (strlen($prefix) < ($size - 13)) {
178 $prefix .= mt_rand();
182 $prefix = substr($prefix, 0, $size - 22);
183 return str_replace('.', '', uniqid($prefix, true));
185 $prefix = substr($prefix, 0, max($size - 13, 0));
186 return uniqid($prefix);
191 * Returns the current Load of the System
195 public static function currentLoad()
197 if (!function_exists('sys_getloadavg')) {
201 $load_arr = sys_getloadavg();
203 if (!is_array($load_arr)) {
207 return max($load_arr[0], $load_arr[1]);
211 * Redirects to an external URL (fully qualified URL)
212 * If you want to route relative to the current Friendica base, use App->internalRedirect()
214 * @param string $url The new Location to redirect
215 * @param int $code The redirection code, which is used (Default is 302)
217 * @throws InternalServerErrorException If the URL is not fully qualified
219 public static function externalRedirect($url, $code = 302)
221 if (empty(parse_url($url, PHP_URL_SCHEME))) {
222 throw new InternalServerErrorException("'$url' is not a fully qualified URL, please use App->internalRedirect() instead");
227 // this is the default code for a REDIRECT
228 // We don't need a extra header here
231 header('HTTP/1.1 301 Moved Permanently');
234 header('HTTP/1.1 307 Temporary Redirect');
238 header("Location: $url");
243 * Returns the system user that is executing the script
245 * This mostly returns something like "www-data".
247 * @return string system username
249 public static function getUser()
251 if (!function_exists('posix_getpwuid') || !function_exists('posix_geteuid')) {
255 $processUser = posix_getpwuid(posix_geteuid());
256 return $processUser['name'];
260 * Checks if a given directory is usable for the system
263 * @param bool $check_writable
265 * @return boolean the directory is usable
267 public static function isDirectoryUsable($directory, $check_writable = true)
269 if ($directory == '') {
270 Logger::log('Directory is empty. This shouldn\'t happen.', Logger::DEBUG);
274 if (!file_exists($directory)) {
275 Logger::log('Path "' . $directory . '" does not exist for user ' . static::getUser(), Logger::DEBUG);
279 if (is_file($directory)) {
280 Logger::log('Path "' . $directory . '" is a file for user ' . static::getUser(), Logger::DEBUG);
284 if (!is_dir($directory)) {
285 Logger::log('Path "' . $directory . '" is not a directory for user ' . static::getUser(), Logger::DEBUG);
289 if ($check_writable && !is_writable($directory)) {
290 Logger::log('Path "' . $directory . '" is not writable for user ' . static::getUser(), Logger::DEBUG);
298 * Exit method used by asynchronous update modules
302 public static function htmlUpdateExit($o)
304 header("Content-type: text/html");
305 echo "<!DOCTYPE html><html><body>\r\n";
306 // We can remove this hack once Internet Explorer recognises HTML5 natively
308 // reportedly some versions of MSIE don't handle tabs in XMLHttpRequest documents very well
309 echo str_replace("\t", " ", $o);
311 echo "</body></html>\r\n";
315 /// @todo Move the following functions from boot.php
317 function local_user()
318 function public_contact()
319 function remote_user()
322 function is_site_admin()
323 function get_temppath()
324 function get_cachefile($file, $writemode = true)
325 function get_itemcachepath()
326 function get_spoolpath()