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1 <?php
2 /**
3  * @file src/App.php
4  */
5 namespace Friendica;
6
7 use Detection\MobileDetect;
8 use DOMDocument;
9 use DOMXPath;
10 use Exception;
11 use Friendica\Core\Config\Cache\ConfigCacheLoader;
12 use Friendica\Core\Config\Cache\IConfigCache;
13 use Friendica\Core\Config\Configuration;
14 use Friendica\Database\DBA;
15 use Friendica\Network\HTTPException\InternalServerErrorException;
16 use Friendica\Util\Profiler;
17 use Psr\Log\LoggerInterface;
18
19 /**
20  *
21  * class: App
22  *
23  * @brief Our main application structure for the life of this page.
24  *
25  * Primarily deals with the URL that got us here
26  * and tries to make some sense of it, and
27  * stores our page contents and config storage
28  * and anything else that might need to be passed around
29  * before we spit the page out.
30  *
31  */
32 class App
33 {
34         public $module_loaded = false;
35         public $module_class = null;
36         public $query_string = '';
37         public $page = [];
38         public $profile;
39         public $profile_uid;
40         public $user;
41         public $cid;
42         public $contact;
43         public $contacts;
44         public $page_contact;
45         public $content;
46         public $data = [];
47         public $error = false;
48         public $cmd = '';
49         public $argv;
50         public $argc;
51         public $module;
52         public $timezone;
53         public $interactive = true;
54         public $identities;
55         public $is_mobile = false;
56         public $is_tablet = false;
57         public $theme_info = [];
58         public $category;
59         // Allow themes to control internal parameters
60         // by changing App values in theme.php
61
62         public $sourcename = '';
63         public $videowidth = 425;
64         public $videoheight = 350;
65         public $force_max_items = 0;
66         public $theme_events_in_profile = true;
67
68         public $stylesheets = [];
69         public $footerScripts = [];
70
71         /**
72          * @var App\Mode The Mode of the Application
73          */
74         private $mode;
75
76         /**
77          * @var string The App base path
78          */
79         private $basePath;
80
81         /**
82          * @var string The App URL path
83          */
84         private $urlPath;
85
86         /**
87          * @var bool true, if the call is from the Friendica APP, otherwise false
88          */
89         private $isFriendicaApp;
90
91         /**
92          * @var bool true, if the call is from an backend node (f.e. worker)
93          */
94         private $isBackend;
95
96         /**
97          * @var string The name of the current theme
98          */
99         private $currentTheme;
100
101         /**
102          * @var bool check if request was an AJAX (xmlhttprequest) request
103          */
104         private $isAjax;
105
106         /**
107          * @var MobileDetect
108          */
109         public $mobileDetect;
110
111         /**
112          * @var Configuration The config
113          */
114         private $config;
115
116         /**
117          * @var LoggerInterface The logger
118          */
119         private $logger;
120
121         /**
122          * @var Profiler The profiler of this app
123          */
124         private $profiler;
125
126         /**
127          * Returns the current config cache of this node
128          *
129          * @return IConfigCache
130          */
131         public function getConfigCache()
132         {
133                 return $this->config->getCache();
134         }
135
136         /**
137          * The basepath of this app
138          *
139          * @return string
140          */
141         public function getBasePath()
142         {
143                 return $this->basePath;
144         }
145
146         /**
147          * The Logger of this app
148          *
149          * @return LoggerInterface
150          */
151         public function getLogger()
152         {
153                 return $this->logger;
154         }
155
156         /**
157          * The profiler of this app
158          *
159          * @return Profiler
160          */
161         public function getProfiler()
162         {
163                 return $this->profiler;
164         }
165
166         /**
167          * Register a stylesheet file path to be included in the <head> tag of every page.
168          * Inclusion is done in App->initHead().
169          * The path can be absolute or relative to the Friendica installation base folder.
170          *
171          * @see initHead()
172          *
173          * @param string $path
174          * @throws InternalServerErrorException
175          */
176         public function registerStylesheet($path)
177         {
178                 $url = str_replace($this->basePath . DIRECTORY_SEPARATOR, '', $path);
179
180                 $this->stylesheets[] = trim($url, '/');
181         }
182
183         /**
184          * Register a javascript file path to be included in the <footer> tag of every page.
185          * Inclusion is done in App->initFooter().
186          * The path can be absolute or relative to the Friendica installation base folder.
187          *
188          * @see initFooter()
189          *
190          * @param string $path
191          * @throws InternalServerErrorException
192          */
193         public function registerFooterScript($path)
194         {
195                 $url = str_replace($this->basePath . DIRECTORY_SEPARATOR, '', $path);
196
197                 $this->footerScripts[] = trim($url, '/');
198         }
199
200         public $process_id;
201         public $queue;
202         private $scheme;
203         private $hostname;
204
205         /**
206          * @brief App constructor.
207          *
208          * @param Configuration    $config    The Configuration
209          * @param LoggerInterface  $logger    The current app logger
210          * @param Profiler         $profiler  The profiler of this application
211          * @param bool             $isBackend Whether it is used for backend or frontend (Default true=backend)
212          *
213          * @throws Exception if the Basepath is not usable
214          */
215         public function __construct(Configuration $config, LoggerInterface $logger, Profiler $profiler, $isBackend = true)
216         {
217                 BaseObject::setApp($this);
218
219                 $this->logger   = $logger;
220                 $this->config   = $config;
221                 $this->profiler = $profiler;
222                 $this->basePath = $this->config->get('system', 'basepath');
223
224                 if (!Core\System::isDirectoryUsable($this->basePath, false)) {
225                         throw new Exception('Basepath \'' . $this->basePath . '\' isn\'t usable.');
226                 }
227                 $this->basePath = rtrim($this->basePath, DIRECTORY_SEPARATOR);
228
229                 $this->checkBackend($isBackend);
230                 $this->checkFriendicaApp();
231
232                 $this->profiler->reset();
233
234                 $this->mode = new App\Mode($this->basePath);
235
236                 $this->reload();
237
238                 set_time_limit(0);
239
240                 // This has to be quite large to deal with embedded private photos
241                 ini_set('pcre.backtrack_limit', 500000);
242
243                 $this->scheme = 'http';
244
245                 if (!empty($_SERVER['HTTPS']) ||
246                         !empty($_SERVER['HTTP_FORWARDED']) && preg_match('/proto=https/', $_SERVER['HTTP_FORWARDED']) ||
247                         !empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https' ||
248                         !empty($_SERVER['HTTP_X_FORWARDED_SSL']) && $_SERVER['HTTP_X_FORWARDED_SSL'] == 'on' ||
249                         !empty($_SERVER['FRONT_END_HTTPS']) && $_SERVER['FRONT_END_HTTPS'] == 'on' ||
250                         !empty($_SERVER['SERVER_PORT']) && (intval($_SERVER['SERVER_PORT']) == 443) // XXX: reasonable assumption, but isn't this hardcoding too much?
251                 ) {
252                         $this->scheme = 'https';
253                 }
254
255                 if (!empty($_SERVER['SERVER_NAME'])) {
256                         $this->hostname = $_SERVER['SERVER_NAME'];
257
258                         if (!empty($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] != 80 && $_SERVER['SERVER_PORT'] != 443) {
259                                 $this->hostname .= ':' . $_SERVER['SERVER_PORT'];
260                         }
261                 }
262
263                 set_include_path(
264                         get_include_path() . PATH_SEPARATOR
265                         . $this->basePath . DIRECTORY_SEPARATOR . 'include' . PATH_SEPARATOR
266                         . $this->basePath . DIRECTORY_SEPARATOR . 'library' . PATH_SEPARATOR
267                         . $this->basePath);
268
269                 if (!empty($_SERVER['QUERY_STRING']) && strpos($_SERVER['QUERY_STRING'], 'pagename=') === 0) {
270                         $this->query_string = substr($_SERVER['QUERY_STRING'], 9);
271                 } elseif (!empty($_SERVER['QUERY_STRING']) && strpos($_SERVER['QUERY_STRING'], 'q=') === 0) {
272                         $this->query_string = substr($_SERVER['QUERY_STRING'], 2);
273                 }
274
275                 // removing trailing / - maybe a nginx problem
276                 $this->query_string = ltrim($this->query_string, '/');
277
278                 if (!empty($_GET['pagename'])) {
279                         $this->cmd = trim($_GET['pagename'], '/\\');
280                 } elseif (!empty($_GET['q'])) {
281                         $this->cmd = trim($_GET['q'], '/\\');
282                 }
283
284                 // fix query_string
285                 $this->query_string = str_replace($this->cmd . '&', $this->cmd . '?', $this->query_string);
286
287                 // unix style "homedir"
288                 if (substr($this->cmd, 0, 1) === '~') {
289                         $this->cmd = 'profile/' . substr($this->cmd, 1);
290                 }
291
292                 // Diaspora style profile url
293                 if (substr($this->cmd, 0, 2) === 'u/') {
294                         $this->cmd = 'profile/' . substr($this->cmd, 2);
295                 }
296
297                 /*
298                  * Break the URL path into C style argc/argv style arguments for our
299                  * modules. Given "http://example.com/module/arg1/arg2", $this->argc
300                  * will be 3 (integer) and $this->argv will contain:
301                  *   [0] => 'module'
302                  *   [1] => 'arg1'
303                  *   [2] => 'arg2'
304                  *
305                  *
306                  * There will always be one argument. If provided a naked domain
307                  * URL, $this->argv[0] is set to "home".
308                  */
309
310                 $this->argv = explode('/', $this->cmd);
311                 $this->argc = count($this->argv);
312                 if ((array_key_exists('0', $this->argv)) && strlen($this->argv[0])) {
313                         $this->module = str_replace('.', '_', $this->argv[0]);
314                         $this->module = str_replace('-', '_', $this->module);
315                 } else {
316                         $this->argc = 1;
317                         $this->argv = ['home'];
318                         $this->module = 'home';
319                 }
320
321                 // Detect mobile devices
322                 $mobile_detect = new MobileDetect();
323
324                 $this->mobileDetect = $mobile_detect;
325
326                 $this->is_mobile = $mobile_detect->isMobile();
327                 $this->is_tablet = $mobile_detect->isTablet();
328
329                 $this->isAjax = strtolower(defaults($_SERVER, 'HTTP_X_REQUESTED_WITH', '')) == 'xmlhttprequest';
330
331                 // Register template engines
332                 Core\Renderer::registerTemplateEngine('Friendica\Render\FriendicaSmartyEngine');
333         }
334
335         /**
336          * Returns the Mode of the Application
337          *
338          * @return App\Mode The Application Mode
339          *
340          * @throws InternalServerErrorException when the mode isn't created
341          */
342         public function getMode()
343         {
344                 if (empty($this->mode)) {
345                         throw new InternalServerErrorException('Mode of the Application is not defined');
346                 }
347
348                 return $this->mode;
349         }
350
351         /**
352          * Reloads the whole app instance
353          */
354         public function reload()
355         {
356                 $this->determineURLPath();
357
358                 $this->getMode()->determine($this->basePath);
359
360                 if ($this->getMode()->has(App\Mode::DBAVAILABLE)) {
361                         Core\Hook::loadHooks();
362                         $loader = new ConfigCacheLoader($this->basePath);
363                         Core\Hook::callAll('load_config', $loader);
364                         $this->config->getCache()->load($loader->loadCoreConfig('addon'), true);
365                 }
366
367                 $this->loadDefaultTimezone();
368
369                 Core\L10n::init();
370
371                 $this->process_id = Core\System::processID('log');
372         }
373
374         /**
375          * Loads the default timezone
376          *
377          * Include support for legacy $default_timezone
378          *
379          * @global string $default_timezone
380          */
381         private function loadDefaultTimezone()
382         {
383                 if ($this->config->get('system', 'default_timezone')) {
384                         $this->timezone = $this->config->get('system', 'default_timezone');
385                 } else {
386                         global $default_timezone;
387                         $this->timezone = !empty($default_timezone) ? $default_timezone : 'UTC';
388                 }
389
390                 if ($this->timezone) {
391                         date_default_timezone_set($this->timezone);
392                 }
393         }
394
395         /**
396          * Figure out if we are running at the top of a domain or in a sub-directory and adjust accordingly
397          */
398         private function determineURLPath()
399         {
400                 /*
401                  * The automatic path detection in this function is currently deactivated,
402                  * see issue https://github.com/friendica/friendica/issues/6679
403                  *
404                  * The problem is that the function seems to be confused with some url.
405                  * These then confuses the detection which changes the url path.
406                  */
407
408                 /* Relative script path to the web server root
409                  * Not all of those $_SERVER properties can be present, so we do by inverse priority order
410                  */
411 /*
412                 $relative_script_path = '';
413                 $relative_script_path = defaults($_SERVER, 'REDIRECT_URL'       , $relative_script_path);
414                 $relative_script_path = defaults($_SERVER, 'REDIRECT_URI'       , $relative_script_path);
415                 $relative_script_path = defaults($_SERVER, 'REDIRECT_SCRIPT_URL', $relative_script_path);
416                 $relative_script_path = defaults($_SERVER, 'SCRIPT_URL'         , $relative_script_path);
417                 $relative_script_path = defaults($_SERVER, 'REQUEST_URI'        , $relative_script_path);
418 */
419                 $this->urlPath = $this->config->get('system', 'urlpath');
420
421                 /* $relative_script_path gives /relative/path/to/friendica/module/parameter
422                  * QUERY_STRING gives pagename=module/parameter
423                  *
424                  * To get /relative/path/to/friendica we perform dirname() for as many levels as there are slashes in the QUERY_STRING
425                  */
426 /*
427                 if (!empty($relative_script_path)) {
428                         // Module
429                         if (!empty($_SERVER['QUERY_STRING'])) {
430                                 $path = trim(rdirname($relative_script_path, substr_count(trim($_SERVER['QUERY_STRING'], '/'), '/') + 1), '/');
431                         } else {
432                                 // Root page
433                                 $path = trim($relative_script_path, '/');
434                         }
435
436                         if ($path && $path != $this->urlPath) {
437                                 $this->urlPath = $path;
438                         }
439                 }
440 */
441         }
442
443         public function getScheme()
444         {
445                 return $this->scheme;
446         }
447
448         /**
449          * @brief Retrieves the Friendica instance base URL
450          *
451          * This function assembles the base URL from multiple parts:
452          * - Protocol is determined either by the request or a combination of
453          * system.ssl_policy and the $ssl parameter.
454          * - Host name is determined either by system.hostname or inferred from request
455          * - Path is inferred from SCRIPT_NAME
456          *
457          * Note: $ssl parameter value doesn't directly correlate with the resulting protocol
458          *
459          * @param bool $ssl Whether to append http or https under SSL_POLICY_SELFSIGN
460          * @return string Friendica server base URL
461          * @throws InternalServerErrorException
462          */
463         public function getBaseURL($ssl = false)
464         {
465                 $scheme = $this->scheme;
466
467                 if (Core\Config::get('system', 'ssl_policy') == SSL_POLICY_FULL) {
468                         $scheme = 'https';
469                 }
470
471                 //      Basically, we have $ssl = true on any links which can only be seen by a logged in user
472                 //      (and also the login link). Anything seen by an outsider will have it turned off.
473
474                 if (Core\Config::get('system', 'ssl_policy') == SSL_POLICY_SELFSIGN) {
475                         if ($ssl) {
476                                 $scheme = 'https';
477                         } else {
478                                 $scheme = 'http';
479                         }
480                 }
481
482                 if (Core\Config::get('config', 'hostname') != '') {
483                         $this->hostname = Core\Config::get('config', 'hostname');
484                 }
485
486                 return $scheme . '://' . $this->hostname . (!empty($this->getURLPath()) ? '/' . $this->getURLPath() : '' );
487         }
488
489         /**
490          * @brief Initializes the baseurl components
491          *
492          * Clears the baseurl cache to prevent inconsistencies
493          *
494          * @param string $url
495          * @throws InternalServerErrorException
496          */
497         public function setBaseURL($url)
498         {
499                 $parsed = @parse_url($url);
500                 $hostname = '';
501
502                 if (!empty($parsed)) {
503                         if (!empty($parsed['scheme'])) {
504                                 $this->scheme = $parsed['scheme'];
505                         }
506
507                         if (!empty($parsed['host'])) {
508                                 $hostname = $parsed['host'];
509                         }
510
511                         if (!empty($parsed['port'])) {
512                                 $hostname .= ':' . $parsed['port'];
513                         }
514                         if (!empty($parsed['path'])) {
515                                 $this->urlPath = trim($parsed['path'], '\\/');
516                         }
517
518                         if (file_exists($this->basePath . '/.htpreconfig.php')) {
519                                 include $this->basePath . '/.htpreconfig.php';
520                         }
521
522                         if (Core\Config::get('config', 'hostname') != '') {
523                                 $this->hostname = Core\Config::get('config', 'hostname');
524                         }
525
526                         if (!isset($this->hostname) || ($this->hostname == '')) {
527                                 $this->hostname = $hostname;
528                         }
529                 }
530         }
531
532         public function getHostName()
533         {
534                 if (Core\Config::get('config', 'hostname') != '') {
535                         $this->hostname = Core\Config::get('config', 'hostname');
536                 }
537
538                 return $this->hostname;
539         }
540
541         public function getURLPath()
542         {
543                 return $this->urlPath;
544         }
545
546         /**
547          * Initializes App->page['htmlhead'].
548          *
549          * Includes:
550          * - Page title
551          * - Favicons
552          * - Registered stylesheets (through App->registerStylesheet())
553          * - Infinite scroll data
554          * - head.tpl template
555          */
556         public function initHead()
557         {
558                 $interval = ((local_user()) ? Core\PConfig::get(local_user(), 'system', 'update_interval') : 40000);
559
560                 // If the update is 'deactivated' set it to the highest integer number (~24 days)
561                 if ($interval < 0) {
562                         $interval = 2147483647;
563                 }
564
565                 if ($interval < 10000) {
566                         $interval = 40000;
567                 }
568
569                 // compose the page title from the sitename and the
570                 // current module called
571                 if (!$this->module == '') {
572                         $this->page['title'] = $this->config->get('config', 'sitename') . ' (' . $this->module . ')';
573                 } else {
574                         $this->page['title'] = $this->config->get('config', 'sitename');
575                 }
576
577                 if (!empty(Core\Renderer::$theme['stylesheet'])) {
578                         $stylesheet = Core\Renderer::$theme['stylesheet'];
579                 } else {
580                         $stylesheet = $this->getCurrentThemeStylesheetPath();
581                 }
582
583                 $this->registerStylesheet($stylesheet);
584
585                 $shortcut_icon = Core\Config::get('system', 'shortcut_icon');
586                 if ($shortcut_icon == '') {
587                         $shortcut_icon = 'images/friendica-32.png';
588                 }
589
590                 $touch_icon = Core\Config::get('system', 'touch_icon');
591                 if ($touch_icon == '') {
592                         $touch_icon = 'images/friendica-128.png';
593                 }
594
595                 Core\Hook::callAll('head', $this->page['htmlhead']);
596
597                 $tpl = Core\Renderer::getMarkupTemplate('head.tpl');
598                 /* put the head template at the beginning of page['htmlhead']
599                  * since the code added by the modules frequently depends on it
600                  * being first
601                  */
602                 $this->page['htmlhead'] = Core\Renderer::replaceMacros($tpl, [
603                         '$baseurl'         => $this->getBaseURL(),
604                         '$local_user'      => local_user(),
605                         '$generator'       => 'Friendica' . ' ' . FRIENDICA_VERSION,
606                         '$delitem'         => Core\L10n::t('Delete this item?'),
607                         '$update_interval' => $interval,
608                         '$shortcut_icon'   => $shortcut_icon,
609                         '$touch_icon'      => $touch_icon,
610                         '$block_public'    => intval(Core\Config::get('system', 'block_public')),
611                         '$stylesheets'     => $this->stylesheets,
612                 ]) . $this->page['htmlhead'];
613         }
614
615         /**
616          * Initializes App->page['footer'].
617          *
618          * Includes:
619          * - Javascript homebase
620          * - Mobile toggle link
621          * - Registered footer scripts (through App->registerFooterScript())
622          * - footer.tpl template
623          */
624         public function initFooter()
625         {
626                 // If you're just visiting, let javascript take you home
627                 if (!empty($_SESSION['visitor_home'])) {
628                         $homebase = $_SESSION['visitor_home'];
629                 } elseif (local_user()) {
630                         $homebase = 'profile/' . $this->user['nickname'];
631                 }
632
633                 if (isset($homebase)) {
634                         $this->page['footer'] .= '<script>var homebase="' . $homebase . '";</script>' . "\n";
635                 }
636
637                 /*
638                  * Add a "toggle mobile" link if we're using a mobile device
639                  */
640                 if ($this->is_mobile || $this->is_tablet) {
641                         if (isset($_SESSION['show-mobile']) && !$_SESSION['show-mobile']) {
642                                 $link = 'toggle_mobile?address=' . urlencode(curPageURL());
643                         } else {
644                                 $link = 'toggle_mobile?off=1&address=' . urlencode(curPageURL());
645                         }
646                         $this->page['footer'] .= Core\Renderer::replaceMacros(Core\Renderer::getMarkupTemplate("toggle_mobile_footer.tpl"), [
647                                 '$toggle_link' => $link,
648                                 '$toggle_text' => Core\L10n::t('toggle mobile')
649                         ]);
650                 }
651
652                 Core\Hook::callAll('footer', $this->page['footer']);
653
654                 $tpl = Core\Renderer::getMarkupTemplate('footer.tpl');
655                 $this->page['footer'] = Core\Renderer::replaceMacros($tpl, [
656                         '$baseurl' => $this->getBaseURL(),
657                         '$footerScripts' => $this->footerScripts,
658                 ]) . $this->page['footer'];
659         }
660
661         /**
662          * @brief Removes the base url from an url. This avoids some mixed content problems.
663          *
664          * @param string $origURL
665          *
666          * @return string The cleaned url
667          * @throws InternalServerErrorException
668          */
669         public function removeBaseURL($origURL)
670         {
671                 // Remove the hostname from the url if it is an internal link
672                 $nurl = Util\Strings::normaliseLink($origURL);
673                 $base = Util\Strings::normaliseLink($this->getBaseURL());
674                 $url = str_replace($base . '/', '', $nurl);
675
676                 // if it is an external link return the orignal value
677                 if ($url == Util\Strings::normaliseLink($origURL)) {
678                         return $origURL;
679                 } else {
680                         return $url;
681                 }
682         }
683
684         /**
685          * Returns the current UserAgent as a String
686          *
687          * @return string the UserAgent as a String
688          * @throws InternalServerErrorException
689          */
690         public function getUserAgent()
691         {
692                 return
693                         FRIENDICA_PLATFORM . " '" .
694                         FRIENDICA_CODENAME . "' " .
695                         FRIENDICA_VERSION . '-' .
696                         DB_UPDATE_VERSION . '; ' .
697                         $this->getBaseURL();
698         }
699
700         /**
701          * Checks, if the call is from the Friendica App
702          *
703          * Reason:
704          * The friendica client has problems with the GUID in the notify. this is some workaround
705          */
706         private function checkFriendicaApp()
707         {
708                 // Friendica-Client
709                 $this->isFriendicaApp = isset($_SERVER['HTTP_USER_AGENT']) && $_SERVER['HTTP_USER_AGENT'] == 'Apache-HttpClient/UNAVAILABLE (java 1.4)';
710         }
711
712         /**
713          *      Is the call via the Friendica app? (not a "normale" call)
714          *
715          * @return bool true if it's from the Friendica app
716          */
717         public function isFriendicaApp()
718         {
719                 return $this->isFriendicaApp;
720         }
721
722         /**
723          * @brief Checks if the site is called via a backend process
724          *
725          * This isn't a perfect solution. But we need this check very early.
726          * So we cannot wait until the modules are loaded.
727          *
728          * @param string $backend true, if the backend flag was set during App initialization
729          *
730          */
731         private function checkBackend($backend) {
732                 static $backends = [
733                         '_well_known',
734                         'api',
735                         'dfrn_notify',
736                         'fetch',
737                         'hcard',
738                         'hostxrd',
739                         'nodeinfo',
740                         'noscrape',
741                         'p',
742                         'poco',
743                         'post',
744                         'proxy',
745                         'pubsub',
746                         'pubsubhubbub',
747                         'receive',
748                         'rsd_xml',
749                         'salmon',
750                         'statistics_json',
751                         'xrd',
752                 ];
753
754                 // Check if current module is in backend or backend flag is set
755                 $this->isBackend = (in_array($this->module, $backends) || $backend || $this->isBackend);
756         }
757
758         /**
759          * Returns true, if the call is from a backend node (f.e. from a worker)
760          *
761          * @return bool Is it a known backend?
762          */
763         public function isBackend()
764         {
765                 return $this->isBackend;
766         }
767
768         /**
769          * @brief Checks if the maximum number of database processes is reached
770          *
771          * @return bool Is the limit reached?
772          */
773         public function isMaxProcessesReached()
774         {
775                 // Deactivated, needs more investigating if this check really makes sense
776                 return false;
777
778                 /*
779                  * Commented out to suppress static analyzer issues
780                  *
781                 if ($this->is_backend()) {
782                         $process = 'backend';
783                         $max_processes = Core\Config::get('system', 'max_processes_backend');
784                         if (intval($max_processes) == 0) {
785                                 $max_processes = 5;
786                         }
787                 } else {
788                         $process = 'frontend';
789                         $max_processes = Core\Config::get('system', 'max_processes_frontend');
790                         if (intval($max_processes) == 0) {
791                                 $max_processes = 20;
792                         }
793                 }
794
795                 $processlist = DBA::processlist();
796                 if ($processlist['list'] != '') {
797                         Core\Logger::log('Processcheck: Processes: ' . $processlist['amount'] . ' - Processlist: ' . $processlist['list'], Core\Logger::DEBUG);
798
799                         if ($processlist['amount'] > $max_processes) {
800                                 Core\Logger::log('Processcheck: Maximum number of processes for ' . $process . ' tasks (' . $max_processes . ') reached.', Core\Logger::DEBUG);
801                                 return true;
802                         }
803                 }
804                 return false;
805                  */
806         }
807
808         /**
809          * @brief Checks if the minimal memory is reached
810          *
811          * @return bool Is the memory limit reached?
812          * @throws InternalServerErrorException
813          */
814         public function isMinMemoryReached()
815         {
816                 $min_memory = Core\Config::get('system', 'min_memory', 0);
817                 if ($min_memory == 0) {
818                         return false;
819                 }
820
821                 if (!is_readable('/proc/meminfo')) {
822                         return false;
823                 }
824
825                 $memdata = explode("\n", file_get_contents('/proc/meminfo'));
826
827                 $meminfo = [];
828                 foreach ($memdata as $line) {
829                         $data = explode(':', $line);
830                         if (count($data) != 2) {
831                                 continue;
832                         }
833                         list($key, $val) = $data;
834                         $meminfo[$key] = (int) trim(str_replace('kB', '', $val));
835                         $meminfo[$key] = (int) ($meminfo[$key] / 1024);
836                 }
837
838                 if (!isset($meminfo['MemFree'])) {
839                         return false;
840                 }
841
842                 $free = $meminfo['MemFree'];
843
844                 $reached = ($free < $min_memory);
845
846                 if ($reached) {
847                         Core\Logger::log('Minimal memory reached: ' . $free . '/' . $meminfo['MemTotal'] . ' - limit ' . $min_memory, Core\Logger::DEBUG);
848                 }
849
850                 return $reached;
851         }
852
853         /**
854          * @brief Checks if the maximum load is reached
855          *
856          * @return bool Is the load reached?
857          * @throws InternalServerErrorException
858          */
859         public function isMaxLoadReached()
860         {
861                 if ($this->isBackend()) {
862                         $process = 'backend';
863                         $maxsysload = intval(Core\Config::get('system', 'maxloadavg'));
864                         if ($maxsysload < 1) {
865                                 $maxsysload = 50;
866                         }
867                 } else {
868                         $process = 'frontend';
869                         $maxsysload = intval(Core\Config::get('system', 'maxloadavg_frontend'));
870                         if ($maxsysload < 1) {
871                                 $maxsysload = 50;
872                         }
873                 }
874
875                 $load = Core\System::currentLoad();
876                 if ($load) {
877                         if (intval($load) > $maxsysload) {
878                                 Core\Logger::log('system: load ' . $load . ' for ' . $process . ' tasks (' . $maxsysload . ') too high.');
879                                 return true;
880                         }
881                 }
882                 return false;
883         }
884
885         /**
886          * Executes a child process with 'proc_open'
887          *
888          * @param string $command The command to execute
889          * @param array  $args    Arguments to pass to the command ( [ 'key' => value, 'key2' => value2, ... ]
890          * @throws InternalServerErrorException
891          */
892         public function proc_run($command, $args)
893         {
894                 if (!function_exists('proc_open')) {
895                         return;
896                 }
897
898                 $cmdline = $this->config->get('config', 'php_path', 'php') . ' ' . escapeshellarg($command);
899
900                 foreach ($args as $key => $value) {
901                         if (!is_null($value) && is_bool($value) && !$value) {
902                                 continue;
903                         }
904
905                         $cmdline .= ' --' . $key;
906                         if (!is_null($value) && !is_bool($value)) {
907                                 $cmdline .= ' ' . $value;
908                         }
909                 }
910
911                 if ($this->isMinMemoryReached()) {
912                         return;
913                 }
914
915                 if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
916                         $resource = proc_open('cmd /c start /b ' . $cmdline, [], $foo, $this->basePath);
917                 } else {
918                         $resource = proc_open($cmdline . ' &', [], $foo, $this->basePath);
919                 }
920                 if (!is_resource($resource)) {
921                         Core\Logger::log('We got no resource for command ' . $cmdline, Core\Logger::DEBUG);
922                         return;
923                 }
924                 proc_close($resource);
925         }
926
927         /**
928          * Generates the site's default sender email address
929          *
930          * @return string
931          * @throws InternalServerErrorException
932          */
933         public function getSenderEmailAddress()
934         {
935                 $sender_email = Core\Config::get('config', 'sender_email');
936                 if (empty($sender_email)) {
937                         $hostname = $this->getHostName();
938                         if (strpos($hostname, ':')) {
939                                 $hostname = substr($hostname, 0, strpos($hostname, ':'));
940                         }
941
942                         $sender_email = 'noreply@' . $hostname;
943                 }
944
945                 return $sender_email;
946         }
947
948         /**
949          * Returns the current theme name.
950          *
951          * @return string the name of the current theme
952          * @throws InternalServerErrorException
953          */
954         public function getCurrentTheme()
955         {
956                 if ($this->getMode()->isInstall()) {
957                         return '';
958                 }
959
960                 if (!$this->currentTheme) {
961                         $this->computeCurrentTheme();
962                 }
963
964                 return $this->currentTheme;
965         }
966
967         public function setCurrentTheme($theme)
968         {
969                 $this->currentTheme = $theme;
970         }
971
972         /**
973          * Computes the current theme name based on the node settings, the user settings and the device type
974          *
975          * @throws Exception
976          */
977         private function computeCurrentTheme()
978         {
979                 $system_theme = Core\Config::get('system', 'theme');
980                 if (!$system_theme) {
981                         throw new Exception(Core\L10n::t('No system theme config value set.'));
982                 }
983
984                 // Sane default
985                 $this->currentTheme = $system_theme;
986
987                 $allowed_themes = explode(',', Core\Config::get('system', 'allowed_themes', $system_theme));
988
989                 $page_theme = null;
990                 // Find the theme that belongs to the user whose stuff we are looking at
991                 if ($this->profile_uid && ($this->profile_uid != local_user())) {
992                         // Allow folks to override user themes and always use their own on their own site.
993                         // This works only if the user is on the same server
994                         $user = DBA::selectFirst('user', ['theme'], ['uid' => $this->profile_uid]);
995                         if (DBA::isResult($user) && !Core\PConfig::get(local_user(), 'system', 'always_my_theme')) {
996                                 $page_theme = $user['theme'];
997                         }
998                 }
999
1000                 $user_theme = Core\Session::get('theme', $system_theme);
1001
1002                 // Specific mobile theme override
1003                 if (($this->is_mobile || $this->is_tablet) && Core\Session::get('show-mobile', true)) {
1004                         $system_mobile_theme = Core\Config::get('system', 'mobile-theme');
1005                         $user_mobile_theme = Core\Session::get('mobile-theme', $system_mobile_theme);
1006
1007                         // --- means same mobile theme as desktop
1008                         if (!empty($user_mobile_theme) && $user_mobile_theme !== '---') {
1009                                 $user_theme = $user_mobile_theme;
1010                         }
1011                 }
1012
1013                 if ($page_theme) {
1014                         $theme_name = $page_theme;
1015                 } else {
1016                         $theme_name = $user_theme;
1017                 }
1018
1019                 if ($theme_name
1020                         && in_array($theme_name, $allowed_themes)
1021                         && (file_exists('view/theme/' . $theme_name . '/style.css')
1022                         || file_exists('view/theme/' . $theme_name . '/style.php'))
1023                 ) {
1024                         $this->currentTheme = $theme_name;
1025                 }
1026         }
1027
1028         /**
1029          * @brief Return full URL to theme which is currently in effect.
1030          *
1031          * Provide a sane default if nothing is chosen or the specified theme does not exist.
1032          *
1033          * @return string
1034          * @throws InternalServerErrorException
1035          */
1036         public function getCurrentThemeStylesheetPath()
1037         {
1038                 return Core\Theme::getStylesheetPath($this->getCurrentTheme());
1039         }
1040
1041         /**
1042          * Check if request was an AJAX (xmlhttprequest) request.
1043          *
1044          * @return boolean true if it was an AJAX request
1045          */
1046         public function isAjax()
1047         {
1048                 return $this->isAjax;
1049         }
1050
1051         /**
1052          * Returns the value of a argv key
1053          * TODO there are a lot of $a->argv usages in combination with defaults() which can be replaced with this method
1054          *
1055          * @param int $position the position of the argument
1056          * @param mixed $default the default value if not found
1057          *
1058          * @return mixed returns the value of the argument
1059          */
1060         public function getArgumentValue($position, $default = '')
1061         {
1062                 if (array_key_exists($position, $this->argv)) {
1063                         return $this->argv[$position];
1064                 }
1065
1066                 return $default;
1067         }
1068
1069         /**
1070          * Sets the base url for use in cmdline programs which don't have
1071          * $_SERVER variables
1072          */
1073         public function checkURL()
1074         {
1075                 $url = Core\Config::get('system', 'url');
1076
1077                 // if the url isn't set or the stored url is radically different
1078                 // than the currently visited url, store the current value accordingly.
1079                 // "Radically different" ignores common variations such as http vs https
1080                 // and www.example.com vs example.com.
1081                 // We will only change the url to an ip address if there is no existing setting
1082
1083                 if (empty($url) || (!Util\Strings::compareLink($url, $this->getBaseURL())) && (!preg_match("/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/", $this->getHostName()))) {
1084                         Core\Config::set('system', 'url', $this->getBaseURL());
1085                 }
1086         }
1087
1088         /**
1089          * Frontend App script
1090          *
1091          * The App object behaves like a container and a dispatcher at the same time, including a representation of the
1092          * request and a representation of the response.
1093          *
1094          * This probably should change to limit the size of this monster method.
1095          */
1096         public function runFrontend()
1097         {
1098                 // Missing DB connection: ERROR
1099                 if ($this->getMode()->has(App\Mode::LOCALCONFIGPRESENT) && !$this->getMode()->has(App\Mode::DBAVAILABLE)) {
1100                         Core\System::httpExit(500, ['title' => 'Error 500 - Internal Server Error', 'description' => 'Apologies but the website is unavailable at the moment.']);
1101                 }
1102
1103                 // Max Load Average reached: ERROR
1104                 if ($this->isMaxProcessesReached() || $this->isMaxLoadReached()) {
1105                         header('Retry-After: 120');
1106                         header('Refresh: 120; url=' . $this->getBaseURL() . "/" . $this->query_string);
1107
1108                         Core\System::httpExit(503, ['title' => 'Error 503 - Service Temporarily Unavailable', 'description' => 'Core\System is currently overloaded. Please try again later.']);
1109                 }
1110
1111                 if (strstr($this->query_string, '.well-known/host-meta') && ($this->query_string != '.well-known/host-meta')) {
1112                         Core\System::httpExit(404);
1113                 }
1114
1115                 if (!$this->getMode()->isInstall()) {
1116                         // Force SSL redirection
1117                         if (Core\Config::get('system', 'force_ssl') && ($this->getScheme() == "http")
1118                                 && intval(Core\Config::get('system', 'ssl_policy')) == SSL_POLICY_FULL
1119                                 && strpos($this->getBaseURL(), 'https://') === 0
1120                                 && $_SERVER['REQUEST_METHOD'] == 'GET') {
1121                                 header('HTTP/1.1 302 Moved Temporarily');
1122                                 header('Location: ' . $this->getBaseURL() . '/' . $this->query_string);
1123                                 exit();
1124                         }
1125
1126                         Core\Session::init();
1127                         Core\Hook::callAll('init_1');
1128                 }
1129
1130                 // Exclude the backend processes from the session management
1131                 if (!$this->isBackend()) {
1132                         $stamp1 = microtime(true);
1133                         session_start();
1134                         $this->profiler->saveTimestamp($stamp1, 'parser', Core\System::callstack());
1135                         Core\L10n::setSessionVariable();
1136                         Core\L10n::setLangFromSession();
1137                 } else {
1138                         $_SESSION = [];
1139                         Core\Worker::executeIfIdle();
1140                 }
1141
1142                 // ZRL
1143                 if (!empty($_GET['zrl']) && $this->getMode()->isNormal()) {
1144                         $this->query_string = Model\Profile::stripZrls($this->query_string);
1145                         if (!local_user()) {
1146                                 // Only continue when the given profile link seems valid
1147                                 // Valid profile links contain a path with "/profile/" and no query parameters
1148                                 if ((parse_url($_GET['zrl'], PHP_URL_QUERY) == "") &&
1149                                         strstr(parse_url($_GET['zrl'], PHP_URL_PATH), "/profile/")) {
1150                                         if (defaults($_SESSION, "visitor_home", "") != $_GET["zrl"]) {
1151                                                 $_SESSION['my_url'] = $_GET['zrl'];
1152                                                 $_SESSION['authenticated'] = 0;
1153                                         }
1154                                         Model\Profile::zrlInit($this);
1155                                 } else {
1156                                         // Someone came with an invalid parameter, maybe as a DDoS attempt
1157                                         // We simply stop processing here
1158                                         Core\Logger::log("Invalid ZRL parameter " . $_GET['zrl'], Core\Logger::DEBUG);
1159                                         Core\System::httpExit(403, ['title' => '403 Forbidden']);
1160                                 }
1161                         }
1162                 }
1163
1164                 if (!empty($_GET['owt']) && $this->getMode()->isNormal()) {
1165                         $token = $_GET['owt'];
1166                         $this->query_string = Model\Profile::stripQueryParam($this->query_string, 'owt');
1167                         Model\Profile::openWebAuthInit($token);
1168                 }
1169
1170                 Module\Login::sessionAuth();
1171
1172                 if (empty($_SESSION['authenticated'])) {
1173                         header('X-Account-Management-Status: none');
1174                 }
1175
1176                 $_SESSION['sysmsg']       = defaults($_SESSION, 'sysmsg'      , []);
1177                 $_SESSION['sysmsg_info']  = defaults($_SESSION, 'sysmsg_info' , []);
1178                 $_SESSION['last_updated'] = defaults($_SESSION, 'last_updated', []);
1179
1180                 /*
1181                  * check_config() is responsible for running update scripts. These automatically
1182                  * update the DB schema whenever we push a new one out. It also checks to see if
1183                  * any addons have been added or removed and reacts accordingly.
1184                  */
1185
1186                 // in install mode, any url loads install module
1187                 // but we need "view" module for stylesheet
1188                 if ($this->getMode()->isInstall() && $this->module != 'view') {
1189                         $this->module = 'install';
1190                 } elseif (!$this->getMode()->has(App\Mode::MAINTENANCEDISABLED) && $this->module != 'view') {
1191                         $this->module = 'maintenance';
1192                 } else {
1193                         $this->checkURL();
1194                         Core\Update::check($this->basePath, false);
1195                         Core\Addon::loadAddons();
1196                         Core\Hook::loadHooks();
1197                 }
1198
1199                 $this->page = [
1200                         'aside' => '',
1201                         'bottom' => '',
1202                         'content' => '',
1203                         'footer' => '',
1204                         'htmlhead' => '',
1205                         'nav' => '',
1206                         'page_title' => '',
1207                         'right_aside' => '',
1208                         'template' => '',
1209                         'title' => ''
1210                 ];
1211
1212                 if (strlen($this->module)) {
1213                         // Compatibility with the Android Diaspora client
1214                         if ($this->module == 'stream') {
1215                                 $this->internalRedirect('network?f=&order=post');
1216                         }
1217
1218                         if ($this->module == 'conversations') {
1219                                 $this->internalRedirect('message');
1220                         }
1221
1222                         if ($this->module == 'commented') {
1223                                 $this->internalRedirect('network?f=&order=comment');
1224                         }
1225
1226                         if ($this->module == 'liked') {
1227                                 $this->internalRedirect('network?f=&order=comment');
1228                         }
1229
1230                         if ($this->module == 'activity') {
1231                                 $this->internalRedirect('network/?f=&conv=1');
1232                         }
1233
1234                         if (($this->module == 'status_messages') && ($this->cmd == 'status_messages/new')) {
1235                                 $this->internalRedirect('bookmarklet');
1236                         }
1237
1238                         if (($this->module == 'user') && ($this->cmd == 'user/edit')) {
1239                                 $this->internalRedirect('settings');
1240                         }
1241
1242                         if (($this->module == 'tag_followings') && ($this->cmd == 'tag_followings/manage')) {
1243                                 $this->internalRedirect('search');
1244                         }
1245
1246                         // Compatibility with the Firefox App
1247                         if (($this->module == "users") && ($this->cmd == "users/sign_in")) {
1248                                 $this->module = "login";
1249                         }
1250
1251                         $privateapps = Core\Config::get('config', 'private_addons', false);
1252                         if (Core\Addon::isEnabled($this->module) && file_exists("addon/{$this->module}/{$this->module}.php")) {
1253                                 //Check if module is an app and if public access to apps is allowed or not
1254                                 if ((!local_user()) && Core\Hook::isAddonApp($this->module) && $privateapps) {
1255                                         info(Core\L10n::t("You must be logged in to use addons. "));
1256                                 } else {
1257                                         include_once "addon/{$this->module}/{$this->module}.php";
1258                                         if (function_exists($this->module . '_module')) {
1259                                                 LegacyModule::setModuleFile("addon/{$this->module}/{$this->module}.php");
1260                                                 $this->module_class = 'Friendica\\LegacyModule';
1261                                                 $this->module_loaded = true;
1262                                         }
1263                                 }
1264                         }
1265
1266                         // Controller class routing
1267                         if (! $this->module_loaded && class_exists('Friendica\\Module\\' . ucfirst($this->module))) {
1268                                 $this->module_class = 'Friendica\\Module\\' . ucfirst($this->module);
1269                                 $this->module_loaded = true;
1270                         }
1271
1272                         /* If not, next look for a 'standard' program module in the 'mod' directory
1273                          * We emulate a Module class through the LegacyModule class
1274                          */
1275                         if (! $this->module_loaded && file_exists("mod/{$this->module}.php")) {
1276                                 LegacyModule::setModuleFile("mod/{$this->module}.php");
1277                                 $this->module_class = 'Friendica\\LegacyModule';
1278                                 $this->module_loaded = true;
1279                         }
1280
1281                         /* The URL provided does not resolve to a valid module.
1282                          *
1283                          * On Dreamhost sites, quite often things go wrong for no apparent reason and they send us to '/internal_error.html'.
1284                          * We don't like doing this, but as it occasionally accounts for 10-20% or more of all site traffic -
1285                          * we are going to trap this and redirect back to the requested page. As long as you don't have a critical error on your page
1286                          * this will often succeed and eventually do the right thing.
1287                          *
1288                          * Otherwise we are going to emit a 404 not found.
1289                          */
1290                         if (! $this->module_loaded) {
1291                                 // Stupid browser tried to pre-fetch our Javascript img template. Don't log the event or return anything - just quietly exit.
1292                                 if (!empty($_SERVER['QUERY_STRING']) && preg_match('/{[0-9]}/', $_SERVER['QUERY_STRING']) !== 0) {
1293                                         exit();
1294                                 }
1295
1296                                 if (!empty($_SERVER['QUERY_STRING']) && ($_SERVER['QUERY_STRING'] === 'q=internal_error.html') && isset($dreamhost_error_hack)) {
1297                                         Core\Logger::log('index.php: dreamhost_error_hack invoked. Original URI =' . $_SERVER['REQUEST_URI']);
1298                                         $this->internalRedirect($_SERVER['REQUEST_URI']);
1299                                 }
1300
1301                                 Core\Logger::log('index.php: page not found: ' . $_SERVER['REQUEST_URI'] . ' ADDRESS: ' . $_SERVER['REMOTE_ADDR'] . ' QUERY: ' . $_SERVER['QUERY_STRING'], Core\Logger::DEBUG);
1302
1303                                 header($_SERVER["SERVER_PROTOCOL"] . ' 404 ' . Core\L10n::t('Not Found'));
1304                                 $tpl = Core\Renderer::getMarkupTemplate("404.tpl");
1305                                 $this->page['content'] = Core\Renderer::replaceMacros($tpl, [
1306                                         '$message' =>  Core\L10n::t('Page not found.')
1307                                 ]);
1308                         }
1309                 }
1310
1311                 $content = '';
1312
1313                 // Initialize module that can set the current theme in the init() method, either directly or via App->profile_uid
1314                 if ($this->module_loaded) {
1315                         $this->page['page_title'] = $this->module;
1316                         $placeholder = '';
1317
1318                         Core\Hook::callAll($this->module . '_mod_init', $placeholder);
1319
1320                         call_user_func([$this->module_class, 'init']);
1321
1322                         // "rawContent" is especially meant for technical endpoints.
1323                         // This endpoint doesn't need any theme initialization or other comparable stuff.
1324                         if (!$this->error) {
1325                                 call_user_func([$this->module_class, 'rawContent']);
1326                         }
1327                 }
1328
1329                 // Load current theme info after module has been initialized as theme could have been set in module
1330                 $theme_info_file = 'view/theme/' . $this->getCurrentTheme() . '/theme.php';
1331                 if (file_exists($theme_info_file)) {
1332                         require_once $theme_info_file;
1333                 }
1334
1335                 if (function_exists(str_replace('-', '_', $this->getCurrentTheme()) . '_init')) {
1336                         $func = str_replace('-', '_', $this->getCurrentTheme()) . '_init';
1337                         $func($this);
1338                 }
1339
1340                 if ($this->module_loaded) {
1341                         if (! $this->error && $_SERVER['REQUEST_METHOD'] === 'POST') {
1342                                 Core\Hook::callAll($this->module . '_mod_post', $_POST);
1343                                 call_user_func([$this->module_class, 'post']);
1344                         }
1345
1346                         if (! $this->error) {
1347                                 Core\Hook::callAll($this->module . '_mod_afterpost', $placeholder);
1348                                 call_user_func([$this->module_class, 'afterpost']);
1349                         }
1350
1351                         if (! $this->error) {
1352                                 $arr = ['content' => $content];
1353                                 Core\Hook::callAll($this->module . '_mod_content', $arr);
1354                                 $content = $arr['content'];
1355                                 $arr = ['content' => call_user_func([$this->module_class, 'content'])];
1356                                 Core\Hook::callAll($this->module . '_mod_aftercontent', $arr);
1357                                 $content .= $arr['content'];
1358                         }
1359                 }
1360
1361                 // initialise content region
1362                 if ($this->getMode()->isNormal()) {
1363                         Core\Hook::callAll('page_content_top', $this->page['content']);
1364                 }
1365
1366                 $this->page['content'] .= $content;
1367
1368                 /* Create the page head after setting the language
1369                  * and getting any auth credentials.
1370                  *
1371                  * Moved initHead() and initFooter() to after
1372                  * all the module functions have executed so that all
1373                  * theme choices made by the modules can take effect.
1374                  */
1375                 $this->initHead();
1376
1377                 /* Build the page ending -- this is stuff that goes right before
1378                  * the closing </body> tag
1379                  */
1380                 $this->initFooter();
1381
1382                 /* now that we've been through the module content, see if the page reported
1383                  * a permission problem and if so, a 403 response would seem to be in order.
1384                  */
1385                 if (stristr(implode("", $_SESSION['sysmsg']), Core\L10n::t('Permission denied'))) {
1386                         header($_SERVER["SERVER_PROTOCOL"] . ' 403 ' . Core\L10n::t('Permission denied.'));
1387                 }
1388
1389                 // Report anything which needs to be communicated in the notification area (before the main body)
1390                 Core\Hook::callAll('page_end', $this->page['content']);
1391
1392                 // Add the navigation (menu) template
1393                 if ($this->module != 'install' && $this->module != 'maintenance') {
1394                         $this->page['htmlhead'] .= Core\Renderer::replaceMacros(Core\Renderer::getMarkupTemplate('nav_head.tpl'), []);
1395                         $this->page['nav']       = Content\Nav::build($this);
1396                 }
1397
1398                 // Build the page - now that we have all the components
1399                 if (isset($_GET["mode"]) && (($_GET["mode"] == "raw") || ($_GET["mode"] == "minimal"))) {
1400                         $doc = new DOMDocument();
1401
1402                         $target = new DOMDocument();
1403                         $target->loadXML("<root></root>");
1404
1405                         $content = mb_convert_encoding($this->page["content"], 'HTML-ENTITIES', "UTF-8");
1406
1407                         /// @TODO one day, kill those error-surpressing @ stuff, or PHP should ban it
1408                         @$doc->loadHTML($content);
1409
1410                         $xpath = new DOMXPath($doc);
1411
1412                         $list = $xpath->query("//*[contains(@id,'tread-wrapper-')]");  /* */
1413
1414                         foreach ($list as $item) {
1415                                 $item = $target->importNode($item, true);
1416
1417                                 // And then append it to the target
1418                                 $target->documentElement->appendChild($item);
1419                         }
1420
1421                         if ($_GET["mode"] == "raw") {
1422                                 header("Content-type: text/html; charset=utf-8");
1423
1424                                 echo substr($target->saveHTML(), 6, -8);
1425
1426                                 exit();
1427                         }
1428                 }
1429
1430                 $page    = $this->page;
1431                 $profile = $this->profile;
1432
1433                 header("X-Friendica-Version: " . FRIENDICA_VERSION);
1434                 header("Content-type: text/html; charset=utf-8");
1435
1436                 if (Core\Config::get('system', 'hsts') && (Core\Config::get('system', 'ssl_policy') == SSL_POLICY_FULL)) {
1437                         header("Strict-Transport-Security: max-age=31536000");
1438                 }
1439
1440                 // Some security stuff
1441                 header('X-Content-Type-Options: nosniff');
1442                 header('X-XSS-Protection: 1; mode=block');
1443                 header('X-Permitted-Cross-Domain-Policies: none');
1444                 header('X-Frame-Options: sameorigin');
1445
1446                 // Things like embedded OSM maps don't work, when this is enabled
1447                 // header("Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; connect-src 'self'; style-src 'self' 'unsafe-inline'; font-src 'self'; img-src 'self' https: data:; media-src 'self' https:; child-src 'self' https:; object-src 'none'");
1448
1449                 /* We use $_GET["mode"] for special page templates. So we will check if we have
1450                  * to load another page template than the default one.
1451                  * The page templates are located in /view/php/ or in the theme directory.
1452                  */
1453                 if (isset($_GET["mode"])) {
1454                         $template = Core\Theme::getPathForFile($_GET["mode"] . '.php');
1455                 }
1456
1457                 // If there is no page template use the default page template
1458                 if (empty($template)) {
1459                         $template = Core\Theme::getPathForFile("default.php");
1460                 }
1461
1462                 // Theme templates expect $a as an App instance
1463                 $a = $this;
1464
1465                 // Used as is in view/php/default.php
1466                 $lang = Core\L10n::getCurrentLang();
1467
1468                 /// @TODO Looks unsafe (remote-inclusion), is maybe not but Core\Theme::getPathForFile() uses file_exists() but does not escape anything
1469                 require_once $template;
1470         }
1471
1472         /**
1473          * Redirects to another module relative to the current Friendica base.
1474          * If you want to redirect to a external URL, use System::externalRedirectTo()
1475          *
1476          * @param string $toUrl The destination URL (Default is empty, which is the default page of the Friendica node)
1477          * @param bool $ssl if true, base URL will try to get called with https:// (works just for relative paths)
1478          *
1479          * @throws InternalServerErrorException In Case the given URL is not relative to the Friendica node
1480          */
1481         public function internalRedirect($toUrl = '', $ssl = false)
1482         {
1483                 if (!empty(parse_url($toUrl, PHP_URL_SCHEME))) {
1484                         throw new InternalServerErrorException("'$toUrl is not a relative path, please use System::externalRedirectTo");
1485                 }
1486
1487                 $redirectTo = $this->getBaseURL($ssl) . '/' . ltrim($toUrl, '/');
1488                 Core\System::externalRedirect($redirectTo);
1489         }
1490
1491         /**
1492          * Automatically redirects to relative or absolute URL
1493          * Should only be used if it isn't clear if the URL is either internal or external
1494          *
1495          * @param string $toUrl The target URL
1496          * @throws InternalServerErrorException
1497          */
1498         public function redirect($toUrl)
1499         {
1500                 if (!empty(parse_url($toUrl, PHP_URL_SCHEME))) {
1501                         Core\System::externalRedirect($toUrl);
1502                 } else {
1503                         $this->internalRedirect($toUrl);
1504                 }
1505         }
1506 }