3 * @copyright Copyright (C) 2010-2021, the Friendica project
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\BadRequestException;
26 use Friendica\Network\HTTPException\FoundException;
27 use Friendica\Network\HTTPException\MovedPermanentlyException;
28 use Friendica\Network\HTTPException\TemporaryRedirectException;
29 use Friendica\Util\XML;
32 * Contains the class with system relevant stuff
37 * Returns a string with a callstack. Can be used for logging.
39 * @param integer $depth How many calls to include in the stacks after filtering
40 * @param int $offset How many calls to shave off the top of the stack, for example if
41 * this is called from a centralized method that isn't relevant to the callstack
44 public static function callstack(int $depth = 4, int $offset = 0)
46 $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
48 // We remove at least the first two items from the list since they contain data that we don't need.
49 $trace = array_slice($trace, 2 + $offset);
52 $previous = ['class' => '', 'function' => '', 'database' => false];
54 // The ignore list contains all functions that are only wrapper functions
55 $ignore = ['call_user_func_array'];
57 while ($func = array_pop($trace)) {
58 if (!empty($func['class'])) {
59 if (in_array($previous['function'], ['insert', 'fetch', 'toArray', 'exists', 'count', 'selectFirst', 'selectToArray',
60 'select', 'update', 'delete', 'selectFirstForUser', 'selectForUser'])
61 && (substr($previous['class'], 0, 15) === 'Friendica\Model')) {
65 // Don't show multiple calls from the Database classes to show the essential parts of the callstack
66 $func['database'] = in_array($func['class'], ['Friendica\Database\DBA', 'Friendica\Database\Database']);
67 if (!$previous['database'] || !$func['database']) {
68 $classparts = explode("\\", $func['class']);
69 $callstack[] = array_pop($classparts).'::'.$func['function'];
72 } elseif (!in_array($func['function'], $ignore)) {
73 $func['database'] = ($func['function'] == 'q');
74 $callstack[] = $func['function'];
81 while ((count($callstack2) < $depth) && (count($callstack) > 0)) {
82 $callstack2[] = array_pop($callstack);
85 return implode(', ', $callstack2);
90 * Outputs a basic dfrn XML status structure to STDOUT, with a <status> variable
91 * of $st and an optional text <message> of $message and terminates the current process.
94 * @param string $message
97 public static function xmlExit($st, $message = '')
99 $result = ['status' => $st];
101 if ($message != '') {
102 $result['message'] = $message;
106 Logger::log('xml_status returning non_zero: ' . $st . " message=" . $message);
109 header("Content-type: text/xml");
111 $xmldata = ["result" => $result];
113 echo XML::fromArray($xmldata, $xml);
119 * Send HTTP status header and exit.
121 * @param integer $val HTTP status result value
122 * @param string $message Error message. Optional.
123 * @param string $content Response body. Optional.
126 public static function httpExit($val, $message = '', $content = '')
129 Logger::debug('Exit with error', ['code' => $val, 'message' => $message, 'callstack' => System::callstack(20), 'method' => $_SERVER['REQUEST_METHOD'], 'agent' => $_SERVER['HTTP_USER_AGENT'] ?? '']);
131 header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $message);
138 public static function jsonError($httpCode, $data, $content_type = 'application/json')
140 if ($httpCode >= 400) {
141 Logger::debug('Exit with error', ['code' => $httpCode, 'content_type' => $content_type, 'callstack' => System::callstack(20), 'method' => $_SERVER['REQUEST_METHOD'], 'agent' => $_SERVER['HTTP_USER_AGENT'] ?? '']);
143 header($_SERVER["SERVER_PROTOCOL"] . ' ' . $httpCode);
144 self::jsonExit($data, $content_type);
148 * Encodes content to json.
150 * This function encodes an array to json format
151 * and adds an application/json HTTP header to the output.
152 * After finishing the process is getting killed.
154 * @param mixed $x The input content.
155 * @param string $content_type Type of the input (Default: 'application/json').
156 * @param integer $options JSON options
158 public static function jsonExit($x, $content_type = 'application/json', int $options = 0) {
159 header("Content-type: $content_type");
160 echo json_encode($x, $options);
165 * Generates a random string in the UUID format
167 * @param bool|string $prefix A given prefix (default is empty)
168 * @return string a generated UUID
171 public static function createUUID($prefix = '')
173 $guid = System::createGUID(32, $prefix);
174 return substr($guid, 0, 8) . '-' . substr($guid, 8, 4) . '-' . substr($guid, 12, 4) . '-' . substr($guid, 16, 4) . '-' . substr($guid, 20, 12);
178 * Generates a GUID with the given parameters
180 * @param int $size The size of the GUID (default is 16)
181 * @param bool|string $prefix A given prefix (default is empty)
182 * @return string a generated GUID
185 public static function createGUID($size = 16, $prefix = '')
187 if (is_bool($prefix) && !$prefix) {
189 } elseif (empty($prefix)) {
190 $prefix = hash('crc32', DI::baseUrl()->getHostname());
193 while (strlen($prefix) < ($size - 13)) {
194 $prefix .= mt_rand();
198 $prefix = substr($prefix, 0, $size - 22);
199 return str_replace('.', '', uniqid($prefix, true));
201 $prefix = substr($prefix, 0, max($size - 13, 0));
202 return uniqid($prefix);
207 * Returns the current Load of the System
211 public static function currentLoad()
213 if (!function_exists('sys_getloadavg')) {
217 $load_arr = sys_getloadavg();
219 if (!is_array($load_arr)) {
223 return max($load_arr[0], $load_arr[1]);
227 * Redirects to an external URL (fully qualified URL)
228 * If you want to route relative to the current Friendica base, use App->internalRedirect()
230 * @param string $url The new Location to redirect
231 * @param int $code The redirection code, which is used (Default is 302)
233 * @throws BadRequestException If the URL is not fully qualified
235 public static function externalRedirect($url, $code = 302)
237 if (empty(parse_url($url, PHP_URL_SCHEME))) {
238 throw new BadRequestException("'$url' is not a fully qualified URL, please use App->internalRedirect() instead");
241 header("Location: $url");
245 throw new FoundException();
247 throw new MovedPermanentlyException();
249 throw new TemporaryRedirectException();
256 * Returns the system user that is executing the script
258 * This mostly returns something like "www-data".
260 * @return string system username
262 public static function getUser()
264 if (!function_exists('posix_getpwuid') || !function_exists('posix_geteuid')) {
268 $processUser = posix_getpwuid(posix_geteuid());
269 return $processUser['name'];
273 * Checks if a given directory is usable for the system
276 * @param bool $check_writable
278 * @return boolean the directory is usable
280 public static function isDirectoryUsable($directory, $check_writable = true)
282 if ($directory == '') {
283 Logger::log('Directory is empty. This shouldn\'t happen.', Logger::DEBUG);
287 if (!file_exists($directory)) {
288 Logger::log('Path "' . $directory . '" does not exist for user ' . static::getUser(), Logger::DEBUG);
292 if (is_file($directory)) {
293 Logger::log('Path "' . $directory . '" is a file for user ' . static::getUser(), Logger::DEBUG);
297 if (!is_dir($directory)) {
298 Logger::log('Path "' . $directory . '" is not a directory for user ' . static::getUser(), Logger::DEBUG);
302 if ($check_writable && !is_writable($directory)) {
303 Logger::log('Path "' . $directory . '" is not writable for user ' . static::getUser(), Logger::DEBUG);
311 * Exit method used by asynchronous update modules
315 public static function htmlUpdateExit($o)
317 header("Content-type: text/html");
318 echo "<!DOCTYPE html><html><body>\r\n";
319 // We can remove this hack once Internet Explorer recognises HTML5 natively
321 // reportedly some versions of MSIE don't handle tabs in XMLHttpRequest documents very well
322 echo str_replace("\t", " ", $o);
324 echo "</body></html>\r\n";
328 /// @todo Move the following functions from boot.php
330 function local_user()
331 function public_contact()
332 function remote_user()
335 function is_site_admin()
336 function get_temppath()
337 function get_spoolpath()