src/App.php

   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\IConfigCache;
  12 use Friendica\Core\Config\Configuration;
  13 use Friendica\Core\Hook;
  14 use Friendica\Core\Theme;
  15 use Friendica\Database\DBA;
  16 use Friendica\Model\Profile;
  17 use Friendica\Network\HTTPException\InternalServerErrorException;
  18 use Friendica\Util\BaseURL;
  19 use Friendica\Util\Config\ConfigFileLoader;
  20 use Friendica\Util\HTTPSignature;
  21 use Friendica\Util\Profiler;
  22 use Friendica\Util\Strings;
  23 use Psr\Log\LoggerInterface;
  24
  25 /**
  26  *
  27  * class: App
  28  *
  29  * @brief Our main application structure for the life of this page.
  30  *
  31  * Primarily deals with the URL that got us here
  32  * and tries to make some sense of it, and
  33  * stores our page contents and config storage
  34  * and anything else that might need to be passed around
  35  * before we spit the page out.
  36  *
  37  */
  38 class App
  39 {
  40         public $module_class = null;
  41         public $query_string = '';
  42         public $page = [];
  43         public $profile;
  44         public $profile_uid;
  45         public $user;
  46         public $cid;
  47         public $contact;
  48         public $contacts;
  49         public $page_contact;
  50         public $content;
  51         public $data = [];
  52         public $cmd = '';
  53         public $argv;
  54         public $argc;
  55         public $module;
  56         public $timezone;
  57         public $interactive = true;
  58         public $identities;
  59         public $is_mobile = false;
  60         public $is_tablet = false;
  61         public $theme_info = [];
  62         public $category;
  63         // Allow themes to control internal parameters
  64         // by changing App values in theme.php
  65
  66         public $sourcename = '';
  67         public $videowidth = 425;
  68         public $videoheight = 350;
  69         public $force_max_items = 0;
  70         public $theme_events_in_profile = true;
  71
  72         public $stylesheets = [];
  73         public $footerScripts = [];
  74
  75         /**
  76          * @var App\Mode The Mode of the Application
  77          */
  78         private $mode;
  79
  80         /**
  81          * @var App\Router
  82          */
  83         private $router;
  84
  85         /**
  86          * @var BaseURL
  87          */
  88         private $baseURL;
  89
  90         /**
  91          * @var bool true, if the call is from the Friendica APP, otherwise false
  92          */
  93         private $isFriendicaApp;
  94
  95         /**
  96          * @var bool true, if the call is from an backend node (f.e. worker)
  97          */
  98         private $isBackend;
  99
 100         /**
 101          * @var string The name of the current theme
 102          */
 103         private $currentTheme;
 104
 105         /**
 106          * @var bool check if request was an AJAX (xmlhttprequest) request
 107          */
 108         private $isAjax;
 109
 110         /**
 111          * @var MobileDetect
 112          */
 113         public $mobileDetect;
 114
 115         /**
 116          * @var Configuration The config
 117          */
 118         private $config;
 119
 120         /**
 121          * @var LoggerInterface The logger
 122          */
 123         private $logger;
 124
 125         /**
 126          * @var Profiler The profiler of this app
 127          */
 128         private $profiler;
 129
 130         /**
 131          * Returns the current config cache of this node
 132          *
 133          * @return IConfigCache
 134          */
 135         public function getConfigCache()
 136         {
 137                 return $this->config->getCache();
 138         }
 139
 140         /**
 141          * Returns the current config of this node
 142          *
 143          * @return Configuration
 144          */
 145         public function getConfig()
 146         {
 147                 return $this->config;
 148         }
 149
 150         /**
 151          * The basepath of this app
 152          *
 153          * @return string
 154          */
 155         public function getBasePath()
 156         {
 157                 return $this->config->get('system', 'basepath');
 158         }
 159
 160         /**
 161          * The Logger of this app
 162          *
 163          * @return LoggerInterface
 164          */
 165         public function getLogger()
 166         {
 167                 return $this->logger;
 168         }
 169
 170         /**
 171          * The profiler of this app
 172          *
 173          * @return Profiler
 174          */
 175         public function getProfiler()
 176         {
 177                 return $this->profiler;
 178         }
 179
 180         /**
 181          * Returns the Mode of the Application
 182          *
 183          * @return App\Mode The Application Mode
 184          */
 185         public function getMode()
 186         {
 187                 return $this->mode;
 188         }
 189
 190         /**
 191          * Returns the router of the Application
 192          *
 193          * @return App\Router
 194          */
 195         public function getRouter()
 196         {
 197                 return $this->router;
 198         }
 199
 200         /**
 201          * Register a stylesheet file path to be included in the <head> tag of every page.
 202          * Inclusion is done in App->initHead().
 203          * The path can be absolute or relative to the Friendica installation base folder.
 204          *
 205          * @see initHead()
 206          *
 207          * @param string $path
 208          */
 209         public function registerStylesheet($path)
 210         {
 211                 if (mb_strpos($path, $this->getBasePath() . DIRECTORY_SEPARATOR) === 0) {
 212                         $path = mb_substr($path, mb_strlen($this->getBasePath() . DIRECTORY_SEPARATOR));
 213                 }
 214
 215                 $this->stylesheets[] = trim($path, '/');
 216         }
 217
 218         /**
 219          * Register a javascript file path to be included in the <footer> tag of every page.
 220          * Inclusion is done in App->initFooter().
 221          * The path can be absolute or relative to the Friendica installation base folder.
 222          *
 223          * @see initFooter()
 224          *
 225          * @param string $path
 226          */
 227         public function registerFooterScript($path)
 228         {
 229                 $url = str_replace($this->getBasePath() . DIRECTORY_SEPARATOR, '', $path);
 230
 231                 $this->footerScripts[] = trim($url, '/');
 232         }
 233
 234         public $queue;
 235
 236         /**
 237          * @brief App constructor.
 238          *
 239          * @param Configuration    $config    The Configuration
 240          * @param App\Mode         $mode      The mode of this Friendica app
 241          * @param App\Router       $router    The router of this Friendica app
 242          * @param BaseURL          $baseURL   The full base URL of this Friendica app
 243          * @param LoggerInterface  $logger    The current app logger
 244          * @param Profiler         $profiler  The profiler of this application
 245          * @param bool             $isBackend Whether it is used for backend or frontend (Default true=backend)
 246          *
 247          * @throws Exception if the Basepath is not usable
 248          */
 249         public function __construct(Configuration $config, App\Mode $mode, App\Router $router, BaseURL $baseURL, LoggerInterface $logger, Profiler $profiler, $isBackend = true)
 250         {
 251                 BaseObject::setApp($this);
 252
 253                 $this->config   = $config;
 254                 $this->mode     = $mode;
 255                 $this->router   = $router;
 256                 $this->baseURL  = $baseURL;
 257                 $this->profiler = $profiler;
 258                 $this->logger   = $logger;
 259
 260                 $this->checkFriendicaApp();
 261
 262                 $this->profiler->reset();
 263
 264                 $this->reload();
 265
 266                 set_time_limit(0);
 267
 268                 // This has to be quite large to deal with embedded private photos
 269                 ini_set('pcre.backtrack_limit', 500000);
 270
 271                 set_include_path(
 272                         get_include_path() . PATH_SEPARATOR
 273                         . $this->getBasePath() . DIRECTORY_SEPARATOR . 'include' . PATH_SEPARATOR
 274                         . $this->getBasePath() . DIRECTORY_SEPARATOR . 'library' . PATH_SEPARATOR
 275                         . $this->getBasePath());
 276
 277                 if (!empty($_SERVER['QUERY_STRING']) && strpos($_SERVER['QUERY_STRING'], 'pagename=') === 0) {
 278                         $this->query_string = substr($_SERVER['QUERY_STRING'], 9);
 279                 } elseif (!empty($_SERVER['QUERY_STRING']) && strpos($_SERVER['QUERY_STRING'], 'q=') === 0) {
 280                         $this->query_string = substr($_SERVER['QUERY_STRING'], 2);
 281                 }
 282
 283                 // removing trailing / - maybe a nginx problem
 284                 $this->query_string = ltrim($this->query_string, '/');
 285
 286                 if (!empty($_GET['pagename'])) {
 287                         $this->cmd = trim($_GET['pagename'], '/\\');
 288                 } elseif (!empty($_GET['q'])) {
 289                         $this->cmd = trim($_GET['q'], '/\\');
 290                 }
 291
 292                 // fix query_string
 293                 $this->query_string = str_replace($this->cmd . '&', $this->cmd . '?', $this->query_string);
 294
 295                 // unix style "homedir"
 296                 if (substr($this->cmd, 0, 1) === '~') {
 297                         $this->cmd = 'profile/' . substr($this->cmd, 1);
 298                 }
 299
 300                 // Diaspora style profile url
 301                 if (substr($this->cmd, 0, 2) === 'u/') {
 302                         $this->cmd = 'profile/' . substr($this->cmd, 2);
 303                 }
 304
 305                 /*
 306                  * Break the URL path into C style argc/argv style arguments for our
 307                  * modules. Given "http://example.com/module/arg1/arg2", $this->argc
 308                  * will be 3 (integer) and $this->argv will contain:
 309                  *   [0] => 'module'
 310                  *   [1] => 'arg1'
 311                  *   [2] => 'arg2'
 312                  *
 313                  *
 314                  * There will always be one argument. If provided a naked domain
 315                  * URL, $this->argv[0] is set to "home".
 316                  */
 317
 318                 $this->argv = explode('/', $this->cmd);
 319                 $this->argc = count($this->argv);
 320                 if ((array_key_exists('0', $this->argv)) && strlen($this->argv[0])) {
 321                         $this->module = str_replace('.', '_', $this->argv[0]);
 322                         $this->module = str_replace('-', '_', $this->module);
 323                 } else {
 324                         $this->argc = 1;
 325                         $this->argv = ['home'];
 326                         $this->module = 'home';
 327                 }
 328
 329                 $this->isBackend = $isBackend || $this->checkBackend($this->module);
 330
 331                 // Detect mobile devices
 332                 $mobile_detect = new MobileDetect();
 333
 334                 $this->mobileDetect = $mobile_detect;
 335
 336                 $this->is_mobile = $mobile_detect->isMobile();
 337                 $this->is_tablet = $mobile_detect->isTablet();
 338
 339                 $this->isAjax = strtolower(defaults($_SERVER, 'HTTP_X_REQUESTED_WITH', '')) == 'xmlhttprequest';
 340
 341                 // Register template engines
 342                 Core\Renderer::registerTemplateEngine('Friendica\Render\FriendicaSmartyEngine');
 343         }
 344
 345         /**
 346          * Reloads the whole app instance
 347          */
 348         public function reload()
 349         {
 350                 $this->getMode()->determine($this->getBasePath());
 351
 352                 if ($this->getMode()->has(App\Mode::DBAVAILABLE)) {
 353                         $loader = new ConfigFileLoader($this->getBasePath(), $this->getMode());
 354                         $this->config->getCache()->load($loader->loadCoreConfig('addon'), true);
 355
 356                         $this->profiler->update(
 357                                 $this->config->get('system', 'profiler', false),
 358                                 $this->config->get('rendertime', 'callstack', false));
 359
 360                         Core\Hook::loadHooks();
 361                         $loader = new ConfigFileLoader($this->getBasePath(), $this->mode);
 362                         Core\Hook::callAll('load_config', $loader);
 363                 }
 364
 365                 $this->loadDefaultTimezone();
 366
 367                 Core\L10n::init();
 368         }
 369
 370         /**
 371          * Loads the default timezone
 372          *
 373          * Include support for legacy $default_timezone
 374          *
 375          * @global string $default_timezone
 376          */
 377         private function loadDefaultTimezone()
 378         {
 379                 if ($this->config->get('system', 'default_timezone')) {
 380                         $this->timezone = $this->config->get('system', 'default_timezone');
 381                 } else {
 382                         global $default_timezone;
 383                         $this->timezone = !empty($default_timezone) ? $default_timezone : 'UTC';
 384                 }
 385
 386                 if ($this->timezone) {
 387                         date_default_timezone_set($this->timezone);
 388                 }
 389         }
 390
 391         /**
 392          * Returns the scheme of the current call
 393          * @return string
 394          *
 395          * @deprecated 2019.06 - use BaseURL->getScheme() instead
 396          */
 397         public function getScheme()
 398         {
 399                 return $this->baseURL->getScheme();
 400         }
 401
 402         /**
 403          * Retrieves the Friendica instance base URL
 404          *
 405          * @param bool $ssl Whether to append http or https under BaseURL::SSL_POLICY_SELFSIGN
 406          *
 407          * @return string Friendica server base URL
 408          *
 409          * @deprecated 2019.06 - use BaseURL->get($ssl) instead
 410          */
 411         public function getBaseURL($ssl = false)
 412         {
 413                 return $this->baseURL->get($ssl);
 414         }
 415
 416         /**
 417          * @brief Initializes the baseurl components
 418          *
 419          * Clears the baseurl cache to prevent inconsistencies
 420          *
 421          * @param string $url
 422          *
 423          * @deprecated 2019.06 - use BaseURL->saveByURL($url) instead
 424          */
 425         public function setBaseURL($url)
 426         {
 427                 $this->baseURL->saveByURL($url);
 428         }
 429
 430         /**
 431          * Returns the current hostname
 432          *
 433          * @return string
 434          *
 435          * @deprecated 2019.06 - use BaseURL->getHostname() instead
 436          */
 437         public function getHostName()
 438         {
 439                 return $this->baseURL->getHostname();
 440         }
 441
 442         /**
 443          * Returns the sub-path of the full URL
 444          *
 445          * @return string
 446          *
 447          * @deprecated 2019.06 - use BaseURL->getUrlPath() instead
 448          */
 449         public function getURLPath()
 450         {
 451                 return $this->baseURL->getUrlPath();
 452         }
 453
 454         /**
 455          * Initializes App->page['htmlhead'].
 456          *
 457          * Includes:
 458          * - Page title
 459          * - Favicons
 460          * - Registered stylesheets (through App->registerStylesheet())
 461          * - Infinite scroll data
 462          * - head.tpl template
 463          */
 464         public function initHead()
 465         {
 466                 $interval = ((local_user()) ? Core\PConfig::get(local_user(), 'system', 'update_interval') : 40000);
 467
 468                 // If the update is 'deactivated' set it to the highest integer number (~24 days)
 469                 if ($interval < 0) {
 470                         $interval = 2147483647;
 471                 }
 472
 473                 if ($interval < 10000) {
 474                         $interval = 40000;
 475                 }
 476
 477                 // Default title: current module called
 478                 if (empty($this->page['title']) && $this->module) {
 479                         $this->page['title'] = ucfirst($this->module);
 480                 }
 481
 482                 // Prepend the sitename to the page title
 483                 $this->page['title'] = $this->config->get('config', 'sitename', '') . (!empty($this->page['title']) ? ' | ' . $this->page['title'] : '');
 484
 485                 if (!empty(Core\Renderer::$theme['stylesheet'])) {
 486                         $stylesheet = Core\Renderer::$theme['stylesheet'];
 487                 } else {
 488                         $stylesheet = $this->getCurrentThemeStylesheetPath();
 489                 }
 490
 491                 $this->registerStylesheet($stylesheet);
 492
 493                 $shortcut_icon = $this->config->get('system', 'shortcut_icon');
 494                 if ($shortcut_icon == '') {
 495                         $shortcut_icon = 'images/friendica-32.png';
 496                 }
 497
 498                 $touch_icon = $this->config->get('system', 'touch_icon');
 499                 if ($touch_icon == '') {
 500                         $touch_icon = 'images/friendica-128.png';
 501                 }
 502
 503                 Core\Hook::callAll('head', $this->page['htmlhead']);
 504
 505                 $tpl = Core\Renderer::getMarkupTemplate('head.tpl');
 506                 /* put the head template at the beginning of page['htmlhead']
 507                  * since the code added by the modules frequently depends on it
 508                  * being first
 509                  */
 510                 $this->page['htmlhead'] = Core\Renderer::replaceMacros($tpl, [
 511                         '$baseurl'         => $this->getBaseURL(),
 512                         '$local_user'      => local_user(),
 513                         '$generator'       => 'Friendica' . ' ' . FRIENDICA_VERSION,
 514                         '$delitem'         => Core\L10n::t('Delete this item?'),
 515                         '$update_interval' => $interval,
 516                         '$shortcut_icon'   => $shortcut_icon,
 517                         '$touch_icon'      => $touch_icon,
 518                         '$block_public'    => intval($this->config->get('system', 'block_public')),
 519                         '$stylesheets'     => $this->stylesheets,
 520                 ]) . $this->page['htmlhead'];
 521         }
 522
 523         /**
 524          * Initializes App->page['footer'].
 525          *
 526          * Includes:
 527          * - Javascript homebase
 528          * - Mobile toggle link
 529          * - Registered footer scripts (through App->registerFooterScript())
 530          * - footer.tpl template
 531          */
 532         public function initFooter()
 533         {
 534                 // If you're just visiting, let javascript take you home
 535                 if (!empty($_SESSION['visitor_home'])) {
 536                         $homebase = $_SESSION['visitor_home'];
 537                 } elseif (local_user()) {
 538                         $homebase = 'profile/' . $this->user['nickname'];
 539                 }
 540
 541                 if (isset($homebase)) {
 542                         $this->page['footer'] .= '<script>var homebase="' . $homebase . '";</script>' . "\n";
 543                 }
 544
 545                 /*
 546                  * Add a "toggle mobile" link if we're using a mobile device
 547                  */
 548                 if ($this->is_mobile || $this->is_tablet) {
 549                         if (isset($_SESSION['show-mobile']) && !$_SESSION['show-mobile']) {
 550                                 $link = 'toggle_mobile?address=' . urlencode(curPageURL());
 551                         } else {
 552                                 $link = 'toggle_mobile?off=1&address=' . urlencode(curPageURL());
 553                         }
 554                         $this->page['footer'] .= Core\Renderer::replaceMacros(Core\Renderer::getMarkupTemplate("toggle_mobile_footer.tpl"), [
 555                                 '$toggle_link' => $link,
 556                                 '$toggle_text' => Core\L10n::t('toggle mobile')
 557                         ]);
 558                 }
 559
 560                 Core\Hook::callAll('footer', $this->page['footer']);
 561
 562                 $tpl = Core\Renderer::getMarkupTemplate('footer.tpl');
 563                 $this->page['footer'] = Core\Renderer::replaceMacros($tpl, [
 564                         '$baseurl' => $this->getBaseURL(),
 565                         '$footerScripts' => $this->footerScripts,
 566                 ]) . $this->page['footer'];
 567         }
 568
 569         /**
 570          * @brief Removes the base url from an url. This avoids some mixed content problems.
 571          *
 572          * @param string $origURL
 573          *
 574          * @return string The cleaned url
 575          * @throws InternalServerErrorException
 576          */
 577         public function removeBaseURL($origURL)
 578         {
 579                 // Remove the hostname from the url if it is an internal link
 580                 $nurl = Util\Strings::normaliseLink($origURL);
 581                 $base = Util\Strings::normaliseLink($this->getBaseURL());
 582                 $url = str_replace($base . '/', '', $nurl);
 583
 584                 // if it is an external link return the orignal value
 585                 if ($url == Util\Strings::normaliseLink($origURL)) {
 586                         return $origURL;
 587                 } else {
 588                         return $url;
 589                 }
 590         }
 591
 592         /**
 593          * Returns the current UserAgent as a String
 594          *
 595          * @return string the UserAgent as a String
 596          * @throws InternalServerErrorException
 597          */
 598         public function getUserAgent()
 599         {
 600                 return
 601                         FRIENDICA_PLATFORM . " '" .
 602                         FRIENDICA_CODENAME . "' " .
 603                         FRIENDICA_VERSION . '-' .
 604                         DB_UPDATE_VERSION . '; ' .
 605                         $this->getBaseURL();
 606         }
 607
 608         /**
 609          * Checks, if the call is from the Friendica App
 610          *
 611          * Reason:
 612          * The friendica client has problems with the GUID in the notify. this is some workaround
 613          */
 614         private function checkFriendicaApp()
 615         {
 616                 // Friendica-Client
 617                 $this->isFriendicaApp = isset($_SERVER['HTTP_USER_AGENT']) && $_SERVER['HTTP_USER_AGENT'] == 'Apache-HttpClient/UNAVAILABLE (java 1.4)';
 618         }
 619
 620         /**
 621          *      Is the call via the Friendica app? (not a "normale" call)
 622          *
 623          * @return bool true if it's from the Friendica app
 624          */
 625         public function isFriendicaApp()
 626         {
 627                 return $this->isFriendicaApp;
 628         }
 629
 630         /**
 631          * @brief Checks if the site is called via a backend process
 632          *
 633          * This isn't a perfect solution. But we need this check very early.
 634          * So we cannot wait until the modules are loaded.
 635          *
 636          * @param string $module
 637          * @return bool
 638          */
 639         private function checkBackend($module) {
 640                 static $backends = [
 641                         '_well_known',
 642                         'api',
 643                         'dfrn_notify',
 644                         'feed',
 645                         'fetch',
 646                         'followers',
 647                         'following',
 648                         'hcard',
 649                         'hostxrd',
 650                         'inbox',
 651                         'manifest',
 652                         'nodeinfo',
 653                         'noscrape',
 654                         'objects',
 655                         'outbox',
 656                         'poco',
 657                         'post',
 658                         'proxy',
 659                         'pubsub',
 660                         'pubsubhubbub',
 661                         'receive',
 662                         'rsd_xml',
 663                         'salmon',
 664                         'statistics_json',
 665                         'xrd',
 666                 ];
 667
 668                 // Check if current module is in backend or backend flag is set
 669                 return in_array($module, $backends);
 670         }
 671
 672         /**
 673          * Returns true, if the call is from a backend node (f.e. from a worker)
 674          *
 675          * @return bool Is it a known backend?
 676          */
 677         public function isBackend()
 678         {
 679                 return $this->isBackend;
 680         }
 681
 682         /**
 683          * @brief Checks if the maximum number of database processes is reached
 684          *
 685          * @return bool Is the limit reached?
 686          */
 687         public function isMaxProcessesReached()
 688         {
 689                 // Deactivated, needs more investigating if this check really makes sense
 690                 return false;
 691
 692                 /*
 693                  * Commented out to suppress static analyzer issues
 694                  *
 695                 if ($this->is_backend()) {
 696                         $process = 'backend';
 697                         $max_processes = $this->config->get('system', 'max_processes_backend');
 698                         if (intval($max_processes) == 0) {
 699                                 $max_processes = 5;
 700                         }
 701                 } else {
 702                         $process = 'frontend';
 703                         $max_processes = $this->config->get('system', 'max_processes_frontend');
 704                         if (intval($max_processes) == 0) {
 705                                 $max_processes = 20;
 706                         }
 707                 }
 708
 709                 $processlist = DBA::processlist();
 710                 if ($processlist['list'] != '') {
 711                         Core\Logger::log('Processcheck: Processes: ' . $processlist['amount'] . ' - Processlist: ' . $processlist['list'], Core\Logger::DEBUG);
 712
 713                         if ($processlist['amount'] > $max_processes) {
 714                                 Core\Logger::log('Processcheck: Maximum number of processes for ' . $process . ' tasks (' . $max_processes . ') reached.', Core\Logger::DEBUG);
 715                                 return true;
 716                         }
 717                 }
 718                 return false;
 719                  */
 720         }
 721
 722         /**
 723          * @brief Checks if the minimal memory is reached
 724          *
 725          * @return bool Is the memory limit reached?
 726          * @throws InternalServerErrorException
 727          */
 728         public function isMinMemoryReached()
 729         {
 730                 $min_memory = $this->config->get('system', 'min_memory', 0);
 731                 if ($min_memory == 0) {
 732                         return false;
 733                 }
 734
 735                 if (!is_readable('/proc/meminfo')) {
 736                         return false;
 737                 }
 738
 739                 $memdata = explode("\n", file_get_contents('/proc/meminfo'));
 740
 741                 $meminfo = [];
 742                 foreach ($memdata as $line) {
 743                         $data = explode(':', $line);
 744                         if (count($data) != 2) {
 745                                 continue;
 746                         }
 747                         list($key, $val) = $data;
 748                         $meminfo[$key] = (int) trim(str_replace('kB', '', $val));
 749                         $meminfo[$key] = (int) ($meminfo[$key] / 1024);
 750                 }
 751
 752                 if (!isset($meminfo['MemFree'])) {
 753                         return false;
 754                 }
 755
 756                 $free = $meminfo['MemFree'];
 757
 758                 $reached = ($free < $min_memory);
 759
 760                 if ($reached) {
 761                         Core\Logger::log('Minimal memory reached: ' . $free . '/' . $meminfo['MemTotal'] . ' - limit ' . $min_memory, Core\Logger::DEBUG);
 762                 }
 763
 764                 return $reached;
 765         }
 766
 767         /**
 768          * @brief Checks if the maximum load is reached
 769          *
 770          * @return bool Is the load reached?
 771          * @throws InternalServerErrorException
 772          */
 773         public function isMaxLoadReached()
 774         {
 775                 if ($this->isBackend()) {
 776                         $process = 'backend';
 777                         $maxsysload = intval($this->config->get('system', 'maxloadavg'));
 778                         if ($maxsysload < 1) {
 779                                 $maxsysload = 50;
 780                         }
 781                 } else {
 782                         $process = 'frontend';
 783                         $maxsysload = intval($this->config->get('system', 'maxloadavg_frontend'));
 784                         if ($maxsysload < 1) {
 785                                 $maxsysload = 50;
 786                         }
 787                 }
 788
 789                 $load = Core\System::currentLoad();
 790                 if ($load) {
 791                         if (intval($load) > $maxsysload) {
 792                                 Core\Logger::log('system: load ' . $load . ' for ' . $process . ' tasks (' . $maxsysload . ') too high.');
 793                                 return true;
 794                         }
 795                 }
 796                 return false;
 797         }
 798
 799         /**
 800          * Executes a child process with 'proc_open'
 801          *
 802          * @param string $command The command to execute
 803          * @param array  $args    Arguments to pass to the command ( [ 'key' => value, 'key2' => value2, ... ]
 804          * @throws InternalServerErrorException
 805          */
 806         public function proc_run($command, $args)
 807         {
 808                 if (!function_exists('proc_open')) {
 809                         return;
 810                 }
 811
 812                 $cmdline = $this->config->get('config', 'php_path', 'php') . ' ' . escapeshellarg($command);
 813
 814                 foreach ($args as $key => $value) {
 815                         if (!is_null($value) && is_bool($value) && !$value) {
 816                                 continue;
 817                         }
 818
 819                         $cmdline .= ' --' . $key;
 820                         if (!is_null($value) && !is_bool($value)) {
 821                                 $cmdline .= ' ' . $value;
 822                         }
 823                 }
 824
 825                 if ($this->isMinMemoryReached()) {
 826                         return;
 827                 }
 828
 829                 if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
 830                         $resource = proc_open('cmd /c start /b ' . $cmdline, [], $foo, $this->getBasePath());
 831                 } else {
 832                         $resource = proc_open($cmdline . ' &', [], $foo, $this->getBasePath());
 833                 }
 834                 if (!is_resource($resource)) {
 835                         Core\Logger::log('We got no resource for command ' . $cmdline, Core\Logger::DEBUG);
 836                         return;
 837                 }
 838                 proc_close($resource);
 839         }
 840
 841         /**
 842          * Generates the site's default sender email address
 843          *
 844          * @return string
 845          * @throws InternalServerErrorException
 846          */
 847         public function getSenderEmailAddress()
 848         {
 849                 $sender_email = $this->config->get('config', 'sender_email');
 850                 if (empty($sender_email)) {
 851                         $hostname = $this->baseURL->getHostname();
 852                         if (strpos($hostname, ':')) {
 853                                 $hostname = substr($hostname, 0, strpos($hostname, ':'));
 854                         }
 855
 856                         $sender_email = 'noreply@' . $hostname;
 857                 }
 858
 859                 return $sender_email;
 860         }
 861
 862         /**
 863          * Returns the current theme name.
 864          *
 865          * @return string the name of the current theme
 866          * @throws InternalServerErrorException
 867          */
 868         public function getCurrentTheme()
 869         {
 870                 if ($this->getMode()->isInstall()) {
 871                         return '';
 872                 }
 873
 874                 if (!$this->currentTheme) {
 875                         $this->computeCurrentTheme();
 876                 }
 877
 878                 return $this->currentTheme;
 879         }
 880
 881         public function setCurrentTheme($theme)
 882         {
 883                 $this->currentTheme = $theme;
 884         }
 885
 886         /**
 887          * Computes the current theme name based on the node settings, the user settings and the device type
 888          *
 889          * @throws Exception
 890          */
 891         private function computeCurrentTheme()
 892         {
 893                 $system_theme = $this->config->get('system', 'theme');
 894                 if (!$system_theme) {
 895                         throw new Exception(Core\L10n::t('No system theme config value set.'));
 896                 }
 897
 898                 // Sane default
 899                 $this->currentTheme = $system_theme;
 900
 901                 $page_theme = null;
 902                 // Find the theme that belongs to the user whose stuff we are looking at
 903                 if ($this->profile_uid && ($this->profile_uid != local_user())) {
 904                         // Allow folks to override user themes and always use their own on their own site.
 905                         // This works only if the user is on the same server
 906                         $user = DBA::selectFirst('user', ['theme'], ['uid' => $this->profile_uid]);
 907                         if (DBA::isResult($user) && !Core\PConfig::get(local_user(), 'system', 'always_my_theme')) {
 908                                 $page_theme = $user['theme'];
 909                         }
 910                 }
 911
 912                 $user_theme = Core\Session::get('theme', $system_theme);
 913
 914                 // Specific mobile theme override
 915                 if (($this->is_mobile || $this->is_tablet) && Core\Session::get('show-mobile', true)) {
 916                         $system_mobile_theme = $this->config->get('system', 'mobile-theme');
 917                         $user_mobile_theme = Core\Session::get('mobile-theme', $system_mobile_theme);
 918
 919                         // --- means same mobile theme as desktop
 920                         if (!empty($user_mobile_theme) && $user_mobile_theme !== '---') {
 921                                 $user_theme = $user_mobile_theme;
 922                         }
 923                 }
 924
 925                 if ($page_theme) {
 926                         $theme_name = $page_theme;
 927                 } else {
 928                         $theme_name = $user_theme;
 929                 }
 930
 931                 $theme_name = Strings::sanitizeFilePathItem($theme_name);
 932                 if ($theme_name
 933                         && in_array($theme_name, Theme::getAllowedList())
 934                         && (file_exists('view/theme/' . $theme_name . '/style.css')
 935                         || file_exists('view/theme/' . $theme_name . '/style.php'))
 936                 ) {
 937                         $this->currentTheme = $theme_name;
 938                 }
 939         }
 940
 941         /**
 942          * @brief Return full URL to theme which is currently in effect.
 943          *
 944          * Provide a sane default if nothing is chosen or the specified theme does not exist.
 945          *
 946          * @return string
 947          * @throws InternalServerErrorException
 948          */
 949         public function getCurrentThemeStylesheetPath()
 950         {
 951                 return Core\Theme::getStylesheetPath($this->getCurrentTheme());
 952         }
 953
 954         /**
 955          * Check if request was an AJAX (xmlhttprequest) request.
 956          *
 957          * @return boolean true if it was an AJAX request
 958          */
 959         public function isAjax()
 960         {
 961                 return $this->isAjax;
 962         }
 963
 964         /**
 965          * Returns the value of a argv key
 966          * TODO there are a lot of $a->argv usages in combination with defaults() which can be replaced with this method
 967          *
 968          * @param int $position the position of the argument
 969          * @param mixed $default the default value if not found
 970          *
 971          * @return mixed returns the value of the argument
 972          */
 973         public function getArgumentValue($position, $default = '')
 974         {
 975                 if (array_key_exists($position, $this->argv)) {
 976                         return $this->argv[$position];
 977                 }
 978
 979                 return $default;
 980         }
 981
 982         /**
 983          * Sets the base url for use in cmdline programs which don't have
 984          * $_SERVER variables
 985          */
 986         public function checkURL()
 987         {
 988                 $url = $this->config->get('system', 'url');
 989
 990                 // if the url isn't set or the stored url is radically different
 991                 // than the currently visited url, store the current value accordingly.
 992                 // "Radically different" ignores common variations such as http vs https
 993                 // and www.example.com vs example.com.
 994                 // We will only change the url to an ip address if there is no existing setting
 995
 996                 if (empty($url) || (!Util\Strings::compareLink($url, $this->getBaseURL())) && (!preg_match("/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/", $this->baseURL->getHostname()))) {
 997                         $this->config->set('system', 'url', $this->getBaseURL());
 998                 }
 999         }
1000
1001         /**
1002          * Frontend App script
1003          *
1004          * The App object behaves like a container and a dispatcher at the same time, including a representation of the
1005          * request and a representation of the response.
1006          *
1007          * This probably should change to limit the size of this monster method.
1008          */
1009         public function runFrontend()
1010         {
1011                 // Missing DB connection: ERROR
1012                 if ($this->getMode()->has(App\Mode::LOCALCONFIGPRESENT) && !$this->getMode()->has(App\Mode::DBAVAILABLE)) {
1013                         Core\System::httpExit(500, ['title' => 'Error 500 - Internal Server Error', 'description' => 'Apologies but the website is unavailable at the moment.']);
1014                 }
1015
1016                 // Max Load Average reached: ERROR
1017                 if ($this->isMaxProcessesReached() || $this->isMaxLoadReached()) {
1018                         header('Retry-After: 120');
1019                         header('Refresh: 120; url=' . $this->getBaseURL() . "/" . $this->query_string);
1020
1021                         Core\System::httpExit(503, ['title' => 'Error 503 - Service Temporarily Unavailable', 'description' => 'Core\System is currently overloaded. Please try again later.']);
1022                 }
1023
1024                 if (strstr($this->query_string, '.well-known/host-meta') && ($this->query_string != '.well-known/host-meta')) {
1025                         Core\System::httpExit(404);
1026                 }
1027
1028                 if (!$this->getMode()->isInstall()) {
1029                         // Force SSL redirection
1030                         if ($this->baseURL->checkRedirectHttps()) {
1031                                 header('HTTP/1.1 302 Moved Temporarily');
1032                                 header('Location: ' . $this->getBaseURL() . '/' . $this->query_string);
1033                                 exit();
1034                         }
1035
1036                         Core\Session::init();
1037                         Core\Hook::callAll('init_1');
1038                 }
1039
1040                 // Exclude the backend processes from the session management
1041                 if (!$this->isBackend()) {
1042                         $stamp1 = microtime(true);
1043                         session_start();
1044                         $this->profiler->saveTimestamp($stamp1, 'parser', Core\System::callstack());
1045                         Core\L10n::setSessionVariable();
1046                         Core\L10n::setLangFromSession();
1047                 } else {
1048                         $_SESSION = [];
1049                         Core\Worker::executeIfIdle();
1050                 }
1051
1052                 if ($this->getMode()->isNormal()) {
1053                         $requester = HTTPSignature::getSigner('', $_SERVER);
1054                         if (!empty($requester)) {
1055                                 Profile::addVisitorCookieForHandle($requester);
1056                         }
1057                 }
1058
1059                 // ZRL
1060                 if (!empty($_GET['zrl']) && $this->getMode()->isNormal()) {
1061                         $this->query_string = Model\Profile::stripZrls($this->query_string);
1062                         if (!local_user()) {
1063                                 // Only continue when the given profile link seems valid
1064                                 // Valid profile links contain a path with "/profile/" and no query parameters
1065                                 if ((parse_url($_GET['zrl'], PHP_URL_QUERY) == "") &&
1066                                         strstr(parse_url($_GET['zrl'], PHP_URL_PATH), "/profile/")) {
1067                                         if (defaults($_SESSION, "visitor_home", "") != $_GET["zrl"]) {
1068                                                 $_SESSION['my_url'] = $_GET['zrl'];
1069                                                 $_SESSION['authenticated'] = 0;
1070                                         }
1071                                         Model\Profile::zrlInit($this);
1072                                 } else {
1073                                         // Someone came with an invalid parameter, maybe as a DDoS attempt
1074                                         // We simply stop processing here
1075                                         Core\Logger::log("Invalid ZRL parameter " . $_GET['zrl'], Core\Logger::DEBUG);
1076                                         Core\System::httpExit(403, ['title' => '403 Forbidden']);
1077                                 }
1078                         }
1079                 }
1080
1081                 if (!empty($_GET['owt']) && $this->getMode()->isNormal()) {
1082                         $token = $_GET['owt'];
1083                         $this->query_string = Model\Profile::stripQueryParam($this->query_string, 'owt');
1084                         Model\Profile::openWebAuthInit($token);
1085                 }
1086
1087                 Module\Login::sessionAuth();
1088
1089                 if (empty($_SESSION['authenticated'])) {
1090                         header('X-Account-Management-Status: none');
1091                 }
1092
1093                 $_SESSION['sysmsg']       = defaults($_SESSION, 'sysmsg'      , []);
1094                 $_SESSION['sysmsg_info']  = defaults($_SESSION, 'sysmsg_info' , []);
1095                 $_SESSION['last_updated'] = defaults($_SESSION, 'last_updated', []);
1096
1097                 /*
1098                  * check_config() is responsible for running update scripts. These automatically
1099                  * update the DB schema whenever we push a new one out. It also checks to see if
1100                  * any addons have been added or removed and reacts accordingly.
1101                  */
1102
1103                 // in install mode, any url loads install module
1104                 // but we need "view" module for stylesheet
1105                 if ($this->getMode()->isInstall() && $this->module != 'view') {
1106                         $this->module = 'install';
1107                 } elseif (!$this->getMode()->has(App\Mode::MAINTENANCEDISABLED) && $this->module != 'view') {
1108                         $this->module = 'maintenance';
1109                 } else {
1110                         $this->checkURL();
1111                         Core\Update::check($this->getBasePath(), false, $this->getMode());
1112                         Core\Addon::loadAddons();
1113                         Core\Hook::loadHooks();
1114                 }
1115
1116                 $this->page = [
1117                         'aside' => '',
1118                         'bottom' => '',
1119                         'content' => '',
1120                         'footer' => '',
1121                         'htmlhead' => '',
1122                         'nav' => '',
1123                         'page_title' => '',
1124                         'right_aside' => '',
1125                         'template' => '',
1126                         'title' => ''
1127                 ];
1128
1129                 if (strlen($this->module)) {
1130                         // Compatibility with the Android Diaspora client
1131                         if ($this->module == 'stream') {
1132                                 $this->internalRedirect('network?f=&order=post');
1133                         }
1134
1135                         if ($this->module == 'conversations') {
1136                                 $this->internalRedirect('message');
1137                         }
1138
1139                         if ($this->module == 'commented') {
1140                                 $this->internalRedirect('network?f=&order=comment');
1141                         }
1142
1143                         if ($this->module == 'liked') {
1144                                 $this->internalRedirect('network?f=&order=comment');
1145                         }
1146
1147                         if ($this->module == 'activity') {
1148                                 $this->internalRedirect('network/?f=&conv=1');
1149                         }
1150
1151                         if (($this->module == 'status_messages') && ($this->cmd == 'status_messages/new')) {
1152                                 $this->internalRedirect('bookmarklet');
1153                         }
1154
1155                         if (($this->module == 'user') && ($this->cmd == 'user/edit')) {
1156                                 $this->internalRedirect('settings');
1157                         }
1158
1159                         if (($this->module == 'tag_followings') && ($this->cmd == 'tag_followings/manage')) {
1160                                 $this->internalRedirect('search');
1161                         }
1162
1163                         // Compatibility with the Firefox App
1164                         if (($this->module == "users") && ($this->cmd == "users/sign_in")) {
1165                                 $this->module = "login";
1166                         }
1167
1168                         /*
1169                          * ROUTING
1170                          *
1171                          * From the request URL, routing consists of obtaining the name of a BaseModule-extending class of which the
1172                          * post() and/or content() static methods can be respectively called to produce a data change or an output.
1173                          */
1174
1175                         // First we try explicit routes defined in App\Router
1176                         $this->router->collectRoutes();
1177
1178                         $data = $this->router->getRouteCollector();
1179                         Hook::callAll('route_collection', $data);
1180
1181                         $this->module_class = $this->router->getModuleClass($this->cmd);
1182
1183                         // Then we try addon-provided modules that we wrap in the LegacyModule class
1184                         if (!$this->module_class && Core\Addon::isEnabled($this->module) && file_exists("addon/{$this->module}/{$this->module}.php")) {
1185                                 //Check if module is an app and if public access to apps is allowed or not
1186                                 $privateapps = $this->config->get('config', 'private_addons', false);
1187                                 if ((!local_user()) && Core\Hook::isAddonApp($this->module) && $privateapps) {
1188                                         info(Core\L10n::t("You must be logged in to use addons. "));
1189                                 } else {
1190                                         include_once "addon/{$this->module}/{$this->module}.php";
1191                                         if (function_exists($this->module . '_module')) {
1192                                                 LegacyModule::setModuleFile("addon/{$this->module}/{$this->module}.php");
1193                                                 $this->module_class = 'Friendica\\LegacyModule';
1194                                         }
1195                                 }
1196                         }
1197
1198                         // Then we try name-matching a Friendica\Module class
1199                         if (!$this->module_class && class_exists('Friendica\\Module\\' . ucfirst($this->module))) {
1200                                 $this->module_class = 'Friendica\\Module\\' . ucfirst($this->module);
1201                         }
1202
1203                         /* Finally, we look for a 'standard' program module in the 'mod' directory
1204                          * We emulate a Module class through the LegacyModule class
1205                          */
1206                         if (!$this->module_class && file_exists("mod/{$this->module}.php")) {
1207                                 LegacyModule::setModuleFile("mod/{$this->module}.php");
1208                                 $this->module_class = 'Friendica\\LegacyModule';
1209                         }
1210
1211                         /* The URL provided does not resolve to a valid module.
1212                          *
1213                          * On Dreamhost sites, quite often things go wrong for no apparent reason and they send us to '/internal_error.html'.
1214                          * We don't like doing this, but as it occasionally accounts for 10-20% or more of all site traffic -
1215                          * we are going to trap this and redirect back to the requested page. As long as you don't have a critical error on your page
1216                          * this will often succeed and eventually do the right thing.
1217                          *
1218                          * Otherwise we are going to emit a 404 not found.
1219                          */
1220                         if (!$this->module_class) {
1221                                 // Stupid browser tried to pre-fetch our Javascript img template. Don't log the event or return anything - just quietly exit.
1222                                 if (!empty($_SERVER['QUERY_STRING']) && preg_match('/{[0-9]}/', $_SERVER['QUERY_STRING']) !== 0) {
1223                                         exit();
1224                                 }
1225
1226                                 if (!empty($_SERVER['QUERY_STRING']) && ($_SERVER['QUERY_STRING'] === 'q=internal_error.html') && isset($dreamhost_error_hack)) {
1227                                         Core\Logger::log('index.php: dreamhost_error_hack invoked. Original URI =' . $_SERVER['REQUEST_URI']);
1228                                         $this->internalRedirect($_SERVER['REQUEST_URI']);
1229                                 }
1230
1231                                 Core\Logger::log('index.php: page not found: ' . $_SERVER['REQUEST_URI'] . ' ADDRESS: ' . $_SERVER['REMOTE_ADDR'] . ' QUERY: ' . $_SERVER['QUERY_STRING'], Core\Logger::DEBUG);
1232
1233                                 header($_SERVER["SERVER_PROTOCOL"] . ' 404 ' . Core\L10n::t('Not Found'));
1234                                 $tpl = Core\Renderer::getMarkupTemplate("404.tpl");
1235                                 $this->page['content'] = Core\Renderer::replaceMacros($tpl, [
1236                                         '$message' =>  Core\L10n::t('Page not found.')
1237                                 ]);
1238                         }
1239                 }
1240
1241                 $content = '';
1242
1243                 // Initialize module that can set the current theme in the init() method, either directly or via App->profile_uid
1244                 if ($this->module_class) {
1245                         $this->page['page_title'] = $this->module;
1246                         $placeholder = '';
1247
1248                         Core\Hook::callAll($this->module . '_mod_init', $placeholder);
1249
1250                         call_user_func([$this->module_class, 'init']);
1251
1252                         // "rawContent" is especially meant for technical endpoints.
1253                         // This endpoint doesn't need any theme initialization or other comparable stuff.
1254                                 call_user_func([$this->module_class, 'rawContent']);
1255                 }
1256
1257                 // Load current theme info after module has been initialized as theme could have been set in module
1258                 $theme_info_file = 'view/theme/' . $this->getCurrentTheme() . '/theme.php';
1259                 if (file_exists($theme_info_file)) {
1260                         require_once $theme_info_file;
1261                 }
1262
1263                 if (function_exists(str_replace('-', '_', $this->getCurrentTheme()) . '_init')) {
1264                         $func = str_replace('-', '_', $this->getCurrentTheme()) . '_init';
1265                         $func($this);
1266                 }
1267
1268                 if ($this->module_class) {
1269                         if ($_SERVER['REQUEST_METHOD'] === 'POST') {
1270                                 Core\Hook::callAll($this->module . '_mod_post', $_POST);
1271                                 call_user_func([$this->module_class, 'post']);
1272                         }
1273
1274                                 Core\Hook::callAll($this->module . '_mod_afterpost', $placeholder);
1275                                 call_user_func([$this->module_class, 'afterpost']);
1276
1277                                 $arr = ['content' => $content];
1278                                 Core\Hook::callAll($this->module . '_mod_content', $arr);
1279                                 $content = $arr['content'];
1280                                 $arr = ['content' => call_user_func([$this->module_class, 'content'])];
1281                                 Core\Hook::callAll($this->module . '_mod_aftercontent', $arr);
1282                                 $content .= $arr['content'];
1283                 }
1284
1285                 // initialise content region
1286                 if ($this->getMode()->isNormal()) {
1287                         Core\Hook::callAll('page_content_top', $this->page['content']);
1288                 }
1289
1290                 $this->page['content'] .= $content;
1291
1292                 /* Create the page head after setting the language
1293                  * and getting any auth credentials.
1294                  *
1295                  * Moved initHead() and initFooter() to after
1296                  * all the module functions have executed so that all
1297                  * theme choices made by the modules can take effect.
1298                  */
1299                 $this->initHead();
1300
1301                 /* Build the page ending -- this is stuff that goes right before
1302                  * the closing </body> tag
1303                  */
1304                 $this->initFooter();
1305
1306                 /* now that we've been through the module content, see if the page reported
1307                  * a permission problem and if so, a 403 response would seem to be in order.
1308                  */
1309                 if (stristr(implode("", $_SESSION['sysmsg']), Core\L10n::t('Permission denied'))) {
1310                         header($_SERVER["SERVER_PROTOCOL"] . ' 403 ' . Core\L10n::t('Permission denied.'));
1311                 }
1312
1313                 if (!$this->isAjax()) {
1314                         Core\Hook::callAll('page_end', $this->page['content']);
1315                 }
1316
1317                 // Add the navigation (menu) template
1318                 if ($this->module != 'install' && $this->module != 'maintenance') {
1319                         $this->page['htmlhead'] .= Core\Renderer::replaceMacros(Core\Renderer::getMarkupTemplate('nav_head.tpl'), []);
1320                         $this->page['nav']       = Content\Nav::build($this);
1321                 }
1322
1323                 // Build the page - now that we have all the components
1324                 if (isset($_GET["mode"]) && (($_GET["mode"] == "raw") || ($_GET["mode"] == "minimal"))) {
1325                         $doc = new DOMDocument();
1326
1327                         $target = new DOMDocument();
1328                         $target->loadXML("<root></root>");
1329
1330                         $content = mb_convert_encoding($this->page["content"], 'HTML-ENTITIES', "UTF-8");
1331
1332                         /// @TODO one day, kill those error-surpressing @ stuff, or PHP should ban it
1333                         @$doc->loadHTML($content);
1334
1335                         $xpath = new DOMXPath($doc);
1336
1337                         $list = $xpath->query("//*[contains(@id,'tread-wrapper-')]");  /* */
1338
1339                         foreach ($list as $item) {
1340                                 $item = $target->importNode($item, true);
1341
1342                                 // And then append it to the target
1343                                 $target->documentElement->appendChild($item);
1344                         }
1345
1346                         if ($_GET["mode"] == "raw") {
1347                                 header("Content-type: text/html; charset=utf-8");
1348
1349                                 echo substr($target->saveHTML(), 6, -8);
1350
1351                                 exit();
1352                         }
1353                 }
1354
1355                 $page    = $this->page;
1356                 $profile = $this->profile;
1357
1358                 header("X-Friendica-Version: " . FRIENDICA_VERSION);
1359                 header("Content-type: text/html; charset=utf-8");
1360
1361                 if ($this->config->get('system', 'hsts') && ($this->baseURL->getSSLPolicy() == BaseUrl::SSL_POLICY_FULL)) {
1362                         header("Strict-Transport-Security: max-age=31536000");
1363                 }
1364
1365                 // Some security stuff
1366                 header('X-Content-Type-Options: nosniff');
1367                 header('X-XSS-Protection: 1; mode=block');
1368                 header('X-Permitted-Cross-Domain-Policies: none');
1369                 header('X-Frame-Options: sameorigin');
1370
1371                 // Things like embedded OSM maps don't work, when this is enabled
1372                 // 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'");
1373
1374                 /* We use $_GET["mode"] for special page templates. So we will check if we have
1375                  * to load another page template than the default one.
1376                  * The page templates are located in /view/php/ or in the theme directory.
1377                  */
1378                 if (isset($_GET["mode"])) {
1379                         $template = Core\Theme::getPathForFile($_GET["mode"] . '.php');
1380                 }
1381
1382                 // If there is no page template use the default page template
1383                 if (empty($template)) {
1384                         $template = Core\Theme::getPathForFile("default.php");
1385                 }
1386
1387                 // Theme templates expect $a as an App instance
1388                 $a = $this;
1389
1390                 // Used as is in view/php/default.php
1391                 $lang = Core\L10n::getCurrentLang();
1392
1393                 /// @TODO Looks unsafe (remote-inclusion), is maybe not but Core\Theme::getPathForFile() uses file_exists() but does not escape anything
1394                 require_once $template;
1395         }
1396
1397         /**
1398          * Redirects to another module relative to the current Friendica base.
1399          * If you want to redirect to a external URL, use System::externalRedirectTo()
1400          *
1401          * @param string $toUrl The destination URL (Default is empty, which is the default page of the Friendica node)
1402          * @param bool $ssl if true, base URL will try to get called with https:// (works just for relative paths)
1403          *
1404          * @throws InternalServerErrorException In Case the given URL is not relative to the Friendica node
1405          */
1406         public function internalRedirect($toUrl = '', $ssl = false)
1407         {
1408                 if (!empty(parse_url($toUrl, PHP_URL_SCHEME))) {
1409                         throw new InternalServerErrorException("'$toUrl is not a relative path, please use System::externalRedirectTo");
1410                 }
1411
1412                 $redirectTo = $this->getBaseURL($ssl) . '/' . ltrim($toUrl, '/');
1413                 Core\System::externalRedirect($redirectTo);
1414         }
1415
1416         /**
1417          * Automatically redirects to relative or absolute URL
1418          * Should only be used if it isn't clear if the URL is either internal or external
1419          *
1420          * @param string $toUrl The target URL
1421          * @throws InternalServerErrorException
1422          */
1423         public function redirect($toUrl)
1424         {
1425                 if (!empty(parse_url($toUrl, PHP_URL_SCHEME))) {
1426                         Core\System::externalRedirect($toUrl);
1427                 } else {
1428                         $this->internalRedirect($toUrl);
1429                 }
1430         }
1431 }