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 $error = false;
  53         public $cmd = '';
  54         public $argv;
  55         public $argc;
  56         public $module;
  57         public $timezone;
  58         public $interactive = true;
  59         public $identities;
  60         public $is_mobile = false;
  61         public $is_tablet = false;
  62         public $theme_info = [];
  63         public $category;
  64         // Allow themes to control internal parameters
  65         // by changing App values in theme.php
  66
  67         public $sourcename = '';
  68         public $videowidth = 425;
  69         public $videoheight = 350;
  70         public $force_max_items = 0;
  71         public $theme_events_in_profile = true;
  72
  73         public $stylesheets = [];
  74         public $footerScripts = [];
  75
  76         /**
  77          * @var App\Mode The Mode of the Application
  78          */
  79         private $mode;
  80
  81         /**
  82          * @var App\Router
  83          */
  84         private $router;
  85
  86         /**
  87          * @var BaseURL
  88          */
  89         private $baseURL;
  90
  91         /**
  92          * @var bool true, if the call is from the Friendica APP, otherwise false
  93          */
  94         private $isFriendicaApp;
  95
  96         /**
  97          * @var bool true, if the call is from an backend node (f.e. worker)
  98          */
  99         private $isBackend;
 100
 101         /**
 102          * @var string The name of the current theme
 103          */
 104         private $currentTheme;
 105
 106         /**
 107          * @var bool check if request was an AJAX (xmlhttprequest) request
 108          */
 109         private $isAjax;
 110
 111         /**
 112          * @var MobileDetect
 113          */
 114         public $mobileDetect;
 115
 116         /**
 117          * @var Configuration The config
 118          */
 119         private $config;
 120
 121         /**
 122          * @var LoggerInterface The logger
 123          */
 124         private $logger;
 125
 126         /**
 127          * @var Profiler The profiler of this app
 128          */
 129         private $profiler;
 130
 131         /**
 132          * Returns the current config cache of this node
 133          *
 134          * @return IConfigCache
 135          */
 136         public function getConfigCache()
 137         {
 138                 return $this->config->getCache();
 139         }
 140
 141         /**
 142          * Returns the current config of this nodde
 143          *
 144          * @return Configuration
 145          */
 146         public function getConfig()
 147         {
 148                 return $this->config;
 149         }
 150
 151         /**
 152          * The basepath of this app
 153          *
 154          * @return string
 155          */
 156         public function getBasePath()
 157         {
 158                 return $this->config->get('system', 'basepath');
 159         }
 160
 161         /**
 162          * The Logger of this app
 163          *
 164          * @return LoggerInterface
 165          */
 166         public function getLogger()
 167         {
 168                 return $this->logger;
 169         }
 170
 171         /**
 172          * The profiler of this app
 173          *
 174          * @return Profiler
 175          */
 176         public function getProfiler()
 177         {
 178                 return $this->profiler;
 179         }
 180
 181         /**
 182          * Returns the Mode of the Application
 183          *
 184          * @return App\Mode The Application Mode
 185          */
 186         public function getMode()
 187         {
 188                 return $this->mode;
 189         }
 190
 191         /**
 192          * Returns the router of the Application
 193          *
 194          * @return App\Router
 195          */
 196         public function getRouter()
 197         {
 198                 return $this->router;
 199         }
 200
 201         /**
 202          * Register a stylesheet file path to be included in the <head> tag of every page.
 203          * Inclusion is done in App->initHead().
 204          * The path can be absolute or relative to the Friendica installation base folder.
 205          *
 206          * @see initHead()
 207          *
 208          * @param string $path
 209          */
 210         public function registerStylesheet($path)
 211         {
 212                 if (mb_strpos($path, $this->getBasePath() . DIRECTORY_SEPARATOR) === 0) {
 213                         $path = mb_substr($path, mb_strlen($this->getBasePath() . DIRECTORY_SEPARATOR));
 214                 }
 215
 216                 $this->stylesheets[] = trim($path, '/');
 217         }
 218
 219         /**
 220          * Register a javascript file path to be included in the <footer> tag of every page.
 221          * Inclusion is done in App->initFooter().
 222          * The path can be absolute or relative to the Friendica installation base folder.
 223          *
 224          * @see initFooter()
 225          *
 226          * @param string $path
 227          */
 228         public function registerFooterScript($path)
 229         {
 230                 $url = str_replace($this->getBasePath() . DIRECTORY_SEPARATOR, '', $path);
 231
 232                 $this->footerScripts[] = trim($url, '/');
 233         }
 234
 235         public $queue;
 236
 237         /**
 238          * @brief App constructor.
 239          *
 240          * @param Configuration    $config    The Configuration
 241          * @param App\Mode         $mode      The mode of this Friendica app
 242          * @param App\Router       $router    The router of this Friendica app
 243          * @param BaseURL          $baseURL   The full base URL of this Friendica app
 244          * @param LoggerInterface  $logger    The current app logger
 245          * @param Profiler         $profiler  The profiler of this application
 246          * @param bool             $isBackend Whether it is used for backend or frontend (Default true=backend)
 247          *
 248          * @throws Exception if the Basepath is not usable
 249          */
 250         public function __construct(Configuration $config, App\Mode $mode, App\Router $router, BaseURL $baseURL, LoggerInterface $logger, Profiler $profiler, $isBackend = true)
 251         {
 252                 BaseObject::setApp($this);
 253
 254                 $this->config   = $config;
 255                 $this->mode     = $mode;
 256                 $this->router   = $router;
 257                 $this->baseURL  = $baseURL;
 258                 $this->profiler = $profiler;
 259                 $this->logger   = $logger;
 260
 261                 $this->checkFriendicaApp();
 262
 263                 $this->profiler->reset();
 264
 265                 $this->reload();
 266
 267                 set_time_limit(0);
 268
 269                 // This has to be quite large to deal with embedded private photos
 270                 ini_set('pcre.backtrack_limit', 500000);
 271
 272                 set_include_path(
 273                         get_include_path() . PATH_SEPARATOR
 274                         . $this->getBasePath() . DIRECTORY_SEPARATOR . 'include' . PATH_SEPARATOR
 275                         . $this->getBasePath() . DIRECTORY_SEPARATOR . 'library' . PATH_SEPARATOR
 276                         . $this->getBasePath());
 277
 278                 if (!empty($_SERVER['QUERY_STRING']) && strpos($_SERVER['QUERY_STRING'], 'pagename=') === 0) {
 279                         $this->query_string = substr($_SERVER['QUERY_STRING'], 9);
 280                 } elseif (!empty($_SERVER['QUERY_STRING']) && strpos($_SERVER['QUERY_STRING'], 'q=') === 0) {
 281                         $this->query_string = substr($_SERVER['QUERY_STRING'], 2);
 282                 }
 283
 284                 // removing trailing / - maybe a nginx problem
 285                 $this->query_string = ltrim($this->query_string, '/');
 286
 287                 if (!empty($_GET['pagename'])) {
 288                         $this->cmd = trim($_GET['pagename'], '/\\');
 289                 } elseif (!empty($_GET['q'])) {
 290                         $this->cmd = trim($_GET['q'], '/\\');
 291                 }
 292
 293                 // fix query_string
 294                 $this->query_string = str_replace($this->cmd . '&', $this->cmd . '?', $this->query_string);
 295
 296                 // unix style "homedir"
 297                 if (substr($this->cmd, 0, 1) === '~') {
 298                         $this->cmd = 'profile/' . substr($this->cmd, 1);
 299                 }
 300
 301                 // Diaspora style profile url
 302                 if (substr($this->cmd, 0, 2) === 'u/') {
 303                         $this->cmd = 'profile/' . substr($this->cmd, 2);
 304                 }
 305
 306                 /*
 307                  * Break the URL path into C style argc/argv style arguments for our
 308                  * modules. Given "http://example.com/module/arg1/arg2", $this->argc
 309                  * will be 3 (integer) and $this->argv will contain:
 310                  *   [0] => 'module'
 311                  *   [1] => 'arg1'
 312                  *   [2] => 'arg2'
 313                  *
 314                  *
 315                  * There will always be one argument. If provided a naked domain
 316                  * URL, $this->argv[0] is set to "home".
 317                  */
 318
 319                 $this->argv = explode('/', $this->cmd);
 320                 $this->argc = count($this->argv);
 321                 if ((array_key_exists('0', $this->argv)) && strlen($this->argv[0])) {
 322                         $this->module = str_replace('.', '_', $this->argv[0]);
 323                         $this->module = str_replace('-', '_', $this->module);
 324                 } else {
 325                         $this->argc = 1;
 326                         $this->argv = ['home'];
 327                         $this->module = 'home';
 328                 }
 329
 330                 $this->isBackend = $isBackend || $this->checkBackend($this->module);
 331
 332                 // Detect mobile devices
 333                 $mobile_detect = new MobileDetect();
 334
 335                 $this->mobileDetect = $mobile_detect;
 336
 337                 $this->is_mobile = $mobile_detect->isMobile();
 338                 $this->is_tablet = $mobile_detect->isTablet();
 339
 340                 $this->isAjax = strtolower(defaults($_SERVER, 'HTTP_X_REQUESTED_WITH', '')) == 'xmlhttprequest';
 341
 342                 // Register template engines
 343                 Core\Renderer::registerTemplateEngine('Friendica\Render\FriendicaSmartyEngine');
 344         }
 345
 346         /**
 347          * Reloads the whole app instance
 348          */
 349         public function reload()
 350         {
 351                 $this->getMode()->determine($this->getBasePath());
 352
 353                 if ($this->getMode()->has(App\Mode::DBAVAILABLE)) {
 354                         $loader = new ConfigFileLoader($this->getBasePath(), $this->getMode());
 355                         $this->config->getCache()->load($loader->loadCoreConfig('addon'), true);
 356
 357                         $this->profiler->update(
 358                                 $this->config->get('system', 'profiler', false),
 359                                 $this->config->get('rendertime', 'callstack', false));
 360
 361                         Core\Hook::loadHooks();
 362                         $loader = new ConfigFileLoader($this->getBasePath(), $this->mode);
 363                         Core\Hook::callAll('load_config', $loader);
 364                 }
 365
 366                 $this->loadDefaultTimezone();
 367
 368                 Core\L10n::init();
 369         }
 370
 371         /**
 372          * Loads the default timezone
 373          *
 374          * Include support for legacy $default_timezone
 375          *
 376          * @global string $default_timezone
 377          */
 378         private function loadDefaultTimezone()
 379         {
 380                 if ($this->config->get('system', 'default_timezone')) {
 381                         $this->timezone = $this->config->get('system', 'default_timezone');
 382                 } else {
 383                         global $default_timezone;
 384                         $this->timezone = !empty($default_timezone) ? $default_timezone : 'UTC';
 385                 }
 386
 387                 if ($this->timezone) {
 388                         date_default_timezone_set($this->timezone);
 389                 }
 390         }
 391
 392         /**
 393          * Returns the scheme of the current call
 394          * @return string
 395          *
 396          * @deprecated 2019.06 - use BaseURL->getScheme() instead
 397          */
 398         public function getScheme()
 399         {
 400                 return $this->baseURL->getScheme();
 401         }
 402
 403         /**
 404          * Retrieves the Friendica instance base URL
 405          *
 406          * @param bool $ssl Whether to append http or https under BaseURL::SSL_POLICY_SELFSIGN
 407          *
 408          * @return string Friendica server base URL
 409          *
 410          * @deprecated 2019.06 - use BaseURL->get($ssl) instead
 411          */
 412         public function getBaseURL($ssl = false)
 413         {
 414                 return $this->baseURL->get($ssl);
 415         }
 416
 417         /**
 418          * @brief Initializes the baseurl components
 419          *
 420          * Clears the baseurl cache to prevent inconsistencies
 421          *
 422          * @param string $url
 423          *
 424          * @deprecated 2019.06 - use BaseURL->saveByURL($url) instead
 425          */
 426         public function setBaseURL($url)
 427         {
 428                 $this->baseURL->saveByURL($url);
 429         }
 430
 431         /**
 432          * Returns the current hostname
 433          *
 434          * @return string
 435          *
 436          * @deprecated 2019.06 - use BaseURL->getHostname() instead
 437          */
 438         public function getHostName()
 439         {
 440                 return $this->baseURL->getHostname();
 441         }
 442
 443         /**
 444          * Returns the sub-path of the full URL
 445          *
 446          * @return string
 447          *
 448          * @deprecated 2019.06 - use BaseURL->getUrlPath() instead
 449          */
 450         public function getURLPath()
 451         {
 452                 return $this->baseURL->getUrlPath();
 453         }
 454
 455         /**
 456          * Initializes App->page['htmlhead'].
 457          *
 458          * Includes:
 459          * - Page title
 460          * - Favicons
 461          * - Registered stylesheets (through App->registerStylesheet())
 462          * - Infinite scroll data
 463          * - head.tpl template
 464          */
 465         public function initHead()
 466         {
 467                 $interval = ((local_user()) ? Core\PConfig::get(local_user(), 'system', 'update_interval') : 40000);
 468
 469                 // If the update is 'deactivated' set it to the highest integer number (~24 days)
 470                 if ($interval < 0) {
 471                         $interval = 2147483647;
 472                 }
 473
 474                 if ($interval < 10000) {
 475                         $interval = 40000;
 476                 }
 477
 478                 // Default title: current module called
 479                 if (empty($this->page['title']) && $this->module) {
 480                         $this->page['title'] = ucfirst($this->module);
 481                 }
 482
 483                 // Prepend the sitename to the page title
 484                 $this->page['title'] = $this->config->get('config', 'sitename', '') . (!empty($this->page['title']) ? ' | ' . $this->page['title'] : '');
 485
 486                 if (!empty(Core\Renderer::$theme['stylesheet'])) {
 487                         $stylesheet = Core\Renderer::$theme['stylesheet'];
 488                 } else {
 489                         $stylesheet = $this->getCurrentThemeStylesheetPath();
 490                 }
 491
 492                 $this->registerStylesheet($stylesheet);
 493
 494                 $shortcut_icon = $this->config->get('system', 'shortcut_icon');
 495                 if ($shortcut_icon == '') {
 496                         $shortcut_icon = 'images/friendica-32.png';
 497                 }
 498
 499                 $touch_icon = $this->config->get('system', 'touch_icon');
 500                 if ($touch_icon == '') {
 501                         $touch_icon = 'images/friendica-128.png';
 502                 }
 503
 504                 Core\Hook::callAll('head', $this->page['htmlhead']);
 505
 506                 $tpl = Core\Renderer::getMarkupTemplate('head.tpl');
 507                 /* put the head template at the beginning of page['htmlhead']
 508                  * since the code added by the modules frequently depends on it
 509                  * being first
 510                  */
 511                 $this->page['htmlhead'] = Core\Renderer::replaceMacros($tpl, [
 512                         '$baseurl'         => $this->getBaseURL(),
 513                         '$local_user'      => local_user(),
 514                         '$generator'       => 'Friendica' . ' ' . FRIENDICA_VERSION,
 515                         '$delitem'         => Core\L10n::t('Delete this item?'),
 516                         '$update_interval' => $interval,
 517                         '$shortcut_icon'   => $shortcut_icon,
 518                         '$touch_icon'      => $touch_icon,
 519                         '$block_public'    => intval($this->config->get('system', 'block_public')),
 520                         '$stylesheets'     => $this->stylesheets,
 521                 ]) . $this->page['htmlhead'];
 522         }
 523
 524         /**
 525          * Initializes App->page['footer'].
 526          *
 527          * Includes:
 528          * - Javascript homebase
 529          * - Mobile toggle link
 530          * - Registered footer scripts (through App->registerFooterScript())
 531          * - footer.tpl template
 532          */
 533         public function initFooter()
 534         {
 535                 // If you're just visiting, let javascript take you home
 536                 if (!empty($_SESSION['visitor_home'])) {
 537                         $homebase = $_SESSION['visitor_home'];
 538                 } elseif (local_user()) {
 539                         $homebase = 'profile/' . $this->user['nickname'];
 540                 }
 541
 542                 if (isset($homebase)) {
 543                         $this->page['footer'] .= '<script>var homebase="' . $homebase . '";</script>' . "\n";
 544                 }
 545
 546                 /*
 547                  * Add a "toggle mobile" link if we're using a mobile device
 548                  */
 549                 if ($this->is_mobile || $this->is_tablet) {
 550                         if (isset($_SESSION['show-mobile']) && !$_SESSION['show-mobile']) {
 551                                 $link = 'toggle_mobile?address=' . urlencode(curPageURL());
 552                         } else {
 553                                 $link = 'toggle_mobile?off=1&address=' . urlencode(curPageURL());
 554                         }
 555                         $this->page['footer'] .= Core\Renderer::replaceMacros(Core\Renderer::getMarkupTemplate("toggle_mobile_footer.tpl"), [
 556                                 '$toggle_link' => $link,
 557                                 '$toggle_text' => Core\L10n::t('toggle mobile')
 558                         ]);
 559                 }
 560
 561                 Core\Hook::callAll('footer', $this->page['footer']);
 562
 563                 $tpl = Core\Renderer::getMarkupTemplate('footer.tpl');
 564                 $this->page['footer'] = Core\Renderer::replaceMacros($tpl, [
 565                         '$baseurl' => $this->getBaseURL(),
 566                         '$footerScripts' => $this->footerScripts,
 567                 ]) . $this->page['footer'];
 568         }
 569
 570         /**
 571          * @brief Removes the base url from an url. This avoids some mixed content problems.
 572          *
 573          * @param string $origURL
 574          *
 575          * @return string The cleaned url
 576          * @throws InternalServerErrorException
 577          */
 578         public function removeBaseURL($origURL)
 579         {
 580                 // Remove the hostname from the url if it is an internal link
 581                 $nurl = Util\Strings::normaliseLink($origURL);
 582                 $base = Util\Strings::normaliseLink($this->getBaseURL());
 583                 $url = str_replace($base . '/', '', $nurl);
 584
 585                 // if it is an external link return the orignal value
 586                 if ($url == Util\Strings::normaliseLink($origURL)) {
 587                         return $origURL;
 588                 } else {
 589                         return $url;
 590                 }
 591         }
 592
 593         /**
 594          * Returns the current UserAgent as a String
 595          *
 596          * @return string the UserAgent as a String
 597          * @throws InternalServerErrorException
 598          */
 599         public function getUserAgent()
 600         {
 601                 return
 602                         FRIENDICA_PLATFORM . " '" .
 603                         FRIENDICA_CODENAME . "' " .
 604                         FRIENDICA_VERSION . '-' .
 605                         DB_UPDATE_VERSION . '; ' .
 606                         $this->getBaseURL();
 607         }
 608
 609         /**
 610          * Checks, if the call is from the Friendica App
 611          *
 612          * Reason:
 613          * The friendica client has problems with the GUID in the notify. this is some workaround
 614          */
 615         private function checkFriendicaApp()
 616         {
 617                 // Friendica-Client
 618                 $this->isFriendicaApp = isset($_SERVER['HTTP_USER_AGENT']) && $_SERVER['HTTP_USER_AGENT'] == 'Apache-HttpClient/UNAVAILABLE (java 1.4)';
 619         }
 620
 621         /**
 622          *      Is the call via the Friendica app? (not a "normale" call)
 623          *
 624          * @return bool true if it's from the Friendica app
 625          */
 626         public function isFriendicaApp()
 627         {
 628                 return $this->isFriendicaApp;
 629         }
 630
 631         /**
 632          * @brief Checks if the site is called via a backend process
 633          *
 634          * This isn't a perfect solution. But we need this check very early.
 635          * So we cannot wait until the modules are loaded.
 636          *
 637          * @param string $module
 638          * @return bool
 639          */
 640         private function checkBackend($module) {
 641                 static $backends = [
 642                         '_well_known',
 643                         'api',
 644                         'dfrn_notify',
 645                         'fetch',
 646                         'hcard',
 647                         'hostxrd',
 648                         'manifest',
 649                         'nodeinfo',
 650                         'noscrape',
 651                         'p',
 652                         'poco',
 653                         'post',
 654                         'proxy',
 655                         'pubsub',
 656                         'pubsubhubbub',
 657                         'receive',
 658                         'rsd_xml',
 659                         'salmon',
 660                         'statistics_json',
 661                         'xrd',
 662                 ];
 663
 664                 // Check if current module is in backend or backend flag is set
 665                 return in_array($module, $backends);
 666         }
 667
 668         /**
 669          * Returns true, if the call is from a backend node (f.e. from a worker)
 670          *
 671          * @return bool Is it a known backend?
 672          */
 673         public function isBackend()
 674         {
 675                 return $this->isBackend;
 676         }
 677
 678         /**
 679          * @brief Checks if the maximum number of database processes is reached
 680          *
 681          * @return bool Is the limit reached?
 682          */
 683         public function isMaxProcessesReached()
 684         {
 685                 // Deactivated, needs more investigating if this check really makes sense
 686                 return false;
 687
 688                 /*
 689                  * Commented out to suppress static analyzer issues
 690                  *
 691                 if ($this->is_backend()) {
 692                         $process = 'backend';
 693                         $max_processes = $this->config->get('system', 'max_processes_backend');
 694                         if (intval($max_processes) == 0) {
 695                                 $max_processes = 5;
 696                         }
 697                 } else {
 698                         $process = 'frontend';
 699                         $max_processes = $this->config->get('system', 'max_processes_frontend');
 700                         if (intval($max_processes) == 0) {
 701                                 $max_processes = 20;
 702                         }
 703                 }
 704
 705                 $processlist = DBA::processlist();
 706                 if ($processlist['list'] != '') {
 707                         Core\Logger::log('Processcheck: Processes: ' . $processlist['amount'] . ' - Processlist: ' . $processlist['list'], Core\Logger::DEBUG);
 708
 709                         if ($processlist['amount'] > $max_processes) {
 710                                 Core\Logger::log('Processcheck: Maximum number of processes for ' . $process . ' tasks (' . $max_processes . ') reached.', Core\Logger::DEBUG);
 711                                 return true;
 712                         }
 713                 }
 714                 return false;
 715                  */
 716         }
 717
 718         /**
 719          * @brief Checks if the minimal memory is reached
 720          *
 721          * @return bool Is the memory limit reached?
 722          * @throws InternalServerErrorException
 723          */
 724         public function isMinMemoryReached()
 725         {
 726                 $min_memory = $this->config->get('system', 'min_memory', 0);
 727                 if ($min_memory == 0) {
 728                         return false;
 729                 }
 730
 731                 if (!is_readable('/proc/meminfo')) {
 732                         return false;
 733                 }
 734
 735                 $memdata = explode("\n", file_get_contents('/proc/meminfo'));
 736
 737                 $meminfo = [];
 738                 foreach ($memdata as $line) {
 739                         $data = explode(':', $line);
 740                         if (count($data) != 2) {
 741                                 continue;
 742                         }
 743                         list($key, $val) = $data;
 744                         $meminfo[$key] = (int) trim(str_replace('kB', '', $val));
 745                         $meminfo[$key] = (int) ($meminfo[$key] / 1024);
 746                 }
 747
 748                 if (!isset($meminfo['MemFree'])) {
 749                         return false;
 750                 }
 751
 752                 $free = $meminfo['MemFree'];
 753
 754                 $reached = ($free < $min_memory);
 755
 756                 if ($reached) {
 757                         Core\Logger::log('Minimal memory reached: ' . $free . '/' . $meminfo['MemTotal'] . ' - limit ' . $min_memory, Core\Logger::DEBUG);
 758                 }
 759
 760                 return $reached;
 761         }
 762
 763         /**
 764          * @brief Checks if the maximum load is reached
 765          *
 766          * @return bool Is the load reached?
 767          * @throws InternalServerErrorException
 768          */
 769         public function isMaxLoadReached()
 770         {
 771                 if ($this->isBackend()) {
 772                         $process = 'backend';
 773                         $maxsysload = intval($this->config->get('system', 'maxloadavg'));
 774                         if ($maxsysload < 1) {
 775                                 $maxsysload = 50;
 776                         }
 777                 } else {
 778                         $process = 'frontend';
 779                         $maxsysload = intval($this->config->get('system', 'maxloadavg_frontend'));
 780                         if ($maxsysload < 1) {
 781                                 $maxsysload = 50;
 782                         }
 783                 }
 784
 785                 $load = Core\System::currentLoad();
 786                 if ($load) {
 787                         if (intval($load) > $maxsysload) {
 788                                 Core\Logger::log('system: load ' . $load . ' for ' . $process . ' tasks (' . $maxsysload . ') too high.');
 789                                 return true;
 790                         }
 791                 }
 792                 return false;
 793         }
 794
 795         /**
 796          * Executes a child process with 'proc_open'
 797          *
 798          * @param string $command The command to execute
 799          * @param array  $args    Arguments to pass to the command ( [ 'key' => value, 'key2' => value2, ... ]
 800          * @throws InternalServerErrorException
 801          */
 802         public function proc_run($command, $args)
 803         {
 804                 if (!function_exists('proc_open')) {
 805                         return;
 806                 }
 807
 808                 $cmdline = $this->config->get('config', 'php_path', 'php') . ' ' . escapeshellarg($command);
 809
 810                 foreach ($args as $key => $value) {
 811                         if (!is_null($value) && is_bool($value) && !$value) {
 812                                 continue;
 813                         }
 814
 815                         $cmdline .= ' --' . $key;
 816                         if (!is_null($value) && !is_bool($value)) {
 817                                 $cmdline .= ' ' . $value;
 818                         }
 819                 }
 820
 821                 if ($this->isMinMemoryReached()) {
 822                         return;
 823                 }
 824
 825                 if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
 826                         $resource = proc_open('cmd /c start /b ' . $cmdline, [], $foo, $this->getBasePath());
 827                 } else {
 828                         $resource = proc_open($cmdline . ' &', [], $foo, $this->getBasePath());
 829                 }
 830                 if (!is_resource($resource)) {
 831                         Core\Logger::log('We got no resource for command ' . $cmdline, Core\Logger::DEBUG);
 832                         return;
 833                 }
 834                 proc_close($resource);
 835         }
 836
 837         /**
 838          * Generates the site's default sender email address
 839          *
 840          * @return string
 841          * @throws InternalServerErrorException
 842          */
 843         public function getSenderEmailAddress()
 844         {
 845                 $sender_email = $this->config->get('config', 'sender_email');
 846                 if (empty($sender_email)) {
 847                         $hostname = $this->baseURL->getHostname();
 848                         if (strpos($hostname, ':')) {
 849                                 $hostname = substr($hostname, 0, strpos($hostname, ':'));
 850                         }
 851
 852                         $sender_email = 'noreply@' . $hostname;
 853                 }
 854
 855                 return $sender_email;
 856         }
 857
 858         /**
 859          * Returns the current theme name.
 860          *
 861          * @return string the name of the current theme
 862          * @throws InternalServerErrorException
 863          */
 864         public function getCurrentTheme()
 865         {
 866                 if ($this->getMode()->isInstall()) {
 867                         return '';
 868                 }
 869
 870                 if (!$this->currentTheme) {
 871                         $this->computeCurrentTheme();
 872                 }
 873
 874                 return $this->currentTheme;
 875         }
 876
 877         public function setCurrentTheme($theme)
 878         {
 879                 $this->currentTheme = $theme;
 880         }
 881
 882         /**
 883          * Computes the current theme name based on the node settings, the user settings and the device type
 884          *
 885          * @throws Exception
 886          */
 887         private function computeCurrentTheme()
 888         {
 889                 $system_theme = $this->config->get('system', 'theme');
 890                 if (!$system_theme) {
 891                         throw new Exception(Core\L10n::t('No system theme config value set.'));
 892                 }
 893
 894                 // Sane default
 895                 $this->currentTheme = $system_theme;
 896
 897                 $page_theme = null;
 898                 // Find the theme that belongs to the user whose stuff we are looking at
 899                 if ($this->profile_uid && ($this->profile_uid != local_user())) {
 900                         // Allow folks to override user themes and always use their own on their own site.
 901                         // This works only if the user is on the same server
 902                         $user = DBA::selectFirst('user', ['theme'], ['uid' => $this->profile_uid]);
 903                         if (DBA::isResult($user) && !Core\PConfig::get(local_user(), 'system', 'always_my_theme')) {
 904                                 $page_theme = $user['theme'];
 905                         }
 906                 }
 907
 908                 $user_theme = Core\Session::get('theme', $system_theme);
 909
 910                 // Specific mobile theme override
 911                 if (($this->is_mobile || $this->is_tablet) && Core\Session::get('show-mobile', true)) {
 912                         $system_mobile_theme = $this->config->get('system', 'mobile-theme');
 913                         $user_mobile_theme = Core\Session::get('mobile-theme', $system_mobile_theme);
 914
 915                         // --- means same mobile theme as desktop
 916                         if (!empty($user_mobile_theme) && $user_mobile_theme !== '---') {
 917                                 $user_theme = $user_mobile_theme;
 918                         }
 919                 }
 920
 921                 if ($page_theme) {
 922                         $theme_name = $page_theme;
 923                 } else {
 924                         $theme_name = $user_theme;
 925                 }
 926
 927                 $theme_name = Strings::sanitizeFilePathItem($theme_name);
 928                 if ($theme_name
 929                         && in_array($theme_name, Theme::getAllowedList())
 930                         && (file_exists('view/theme/' . $theme_name . '/style.css')
 931                         || file_exists('view/theme/' . $theme_name . '/style.php'))
 932                 ) {
 933                         $this->currentTheme = $theme_name;
 934                 }
 935         }
 936
 937         /**
 938          * @brief Return full URL to theme which is currently in effect.
 939          *
 940          * Provide a sane default if nothing is chosen or the specified theme does not exist.
 941          *
 942          * @return string
 943          * @throws InternalServerErrorException
 944          */
 945         public function getCurrentThemeStylesheetPath()
 946         {
 947                 return Core\Theme::getStylesheetPath($this->getCurrentTheme());
 948         }
 949
 950         /**
 951          * Check if request was an AJAX (xmlhttprequest) request.
 952          *
 953          * @return boolean true if it was an AJAX request
 954          */
 955         public function isAjax()
 956         {
 957                 return $this->isAjax;
 958         }
 959
 960         /**
 961          * Returns the value of a argv key
 962          * TODO there are a lot of $a->argv usages in combination with defaults() which can be replaced with this method
 963          *
 964          * @param int $position the position of the argument
 965          * @param mixed $default the default value if not found
 966          *
 967          * @return mixed returns the value of the argument
 968          */
 969         public function getArgumentValue($position, $default = '')
 970         {
 971                 if (array_key_exists($position, $this->argv)) {
 972                         return $this->argv[$position];
 973                 }
 974
 975                 return $default;
 976         }
 977
 978         /**
 979          * Sets the base url for use in cmdline programs which don't have
 980          * $_SERVER variables
 981          */
 982         public function checkURL()
 983         {
 984                 $url = $this->config->get('system', 'url');
 985
 986                 // if the url isn't set or the stored url is radically different
 987                 // than the currently visited url, store the current value accordingly.
 988                 // "Radically different" ignores common variations such as http vs https
 989                 // and www.example.com vs example.com.
 990                 // We will only change the url to an ip address if there is no existing setting
 991
 992                 if (empty($url) || (!Util\Strings::compareLink($url, $this->getBaseURL())) && (!preg_match("/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/", $this->baseURL->getHostname()))) {
 993                         $this->config->set('system', 'url', $this->getBaseURL());
 994                 }
 995         }
 996
 997         /**
 998          * Frontend App script
 999          *
1000          * The App object behaves like a container and a dispatcher at the same time, including a representation of the
1001          * request and a representation of the response.
1002          *
1003          * This probably should change to limit the size of this monster method.
1004          */
1005         public function runFrontend()
1006         {
1007                 // Missing DB connection: ERROR
1008                 if ($this->getMode()->has(App\Mode::LOCALCONFIGPRESENT) && !$this->getMode()->has(App\Mode::DBAVAILABLE)) {
1009                         Core\System::httpExit(500, ['title' => 'Error 500 - Internal Server Error', 'description' => 'Apologies but the website is unavailable at the moment.']);
1010                 }
1011
1012                 // Max Load Average reached: ERROR
1013                 if ($this->isMaxProcessesReached() || $this->isMaxLoadReached()) {
1014                         header('Retry-After: 120');
1015                         header('Refresh: 120; url=' . $this->getBaseURL() . "/" . $this->query_string);
1016
1017                         Core\System::httpExit(503, ['title' => 'Error 503 - Service Temporarily Unavailable', 'description' => 'Core\System is currently overloaded. Please try again later.']);
1018                 }
1019
1020                 if (strstr($this->query_string, '.well-known/host-meta') && ($this->query_string != '.well-known/host-meta')) {
1021                         Core\System::httpExit(404);
1022                 }
1023
1024                 if (!$this->getMode()->isInstall()) {
1025                         // Force SSL redirection
1026                         if ($this->baseURL->checkRedirectHttps()) {
1027                                 header('HTTP/1.1 302 Moved Temporarily');
1028                                 header('Location: ' . $this->getBaseURL() . '/' . $this->query_string);
1029                                 exit();
1030                         }
1031
1032                         Core\Session::init();
1033                         Core\Hook::callAll('init_1');
1034                 }
1035
1036                 // Exclude the backend processes from the session management
1037                 if (!$this->isBackend()) {
1038                         $stamp1 = microtime(true);
1039                         session_start();
1040                         $this->profiler->saveTimestamp($stamp1, 'parser', Core\System::callstack());
1041                         Core\L10n::setSessionVariable();
1042                         Core\L10n::setLangFromSession();
1043                 } else {
1044                         $_SESSION = [];
1045                         Core\Worker::executeIfIdle();
1046                 }
1047
1048                 if ($this->getMode()->isNormal()) {
1049                         $requester = HTTPSignature::getSigner('', $_SERVER);
1050                         if (!empty($requester)) {
1051                                 Profile::addVisitorCookieForHandle($requester);
1052                         }
1053                 }
1054
1055                 // ZRL
1056                 if (!empty($_GET['zrl']) && $this->getMode()->isNormal()) {
1057                         $this->query_string = Model\Profile::stripZrls($this->query_string);
1058                         if (!local_user()) {
1059                                 // Only continue when the given profile link seems valid
1060                                 // Valid profile links contain a path with "/profile/" and no query parameters
1061                                 if ((parse_url($_GET['zrl'], PHP_URL_QUERY) == "") &&
1062                                         strstr(parse_url($_GET['zrl'], PHP_URL_PATH), "/profile/")) {
1063                                         if (defaults($_SESSION, "visitor_home", "") != $_GET["zrl"]) {
1064                                                 $_SESSION['my_url'] = $_GET['zrl'];
1065                                                 $_SESSION['authenticated'] = 0;
1066                                         }
1067                                         Model\Profile::zrlInit($this);
1068                                 } else {
1069                                         // Someone came with an invalid parameter, maybe as a DDoS attempt
1070                                         // We simply stop processing here
1071                                         Core\Logger::log("Invalid ZRL parameter " . $_GET['zrl'], Core\Logger::DEBUG);
1072                                         Core\System::httpExit(403, ['title' => '403 Forbidden']);
1073                                 }
1074                         }
1075                 }
1076
1077                 if (!empty($_GET['owt']) && $this->getMode()->isNormal()) {
1078                         $token = $_GET['owt'];
1079                         $this->query_string = Model\Profile::stripQueryParam($this->query_string, 'owt');
1080                         Model\Profile::openWebAuthInit($token);
1081                 }
1082
1083                 Module\Login::sessionAuth();
1084
1085                 if (empty($_SESSION['authenticated'])) {
1086                         header('X-Account-Management-Status: none');
1087                 }
1088
1089                 $_SESSION['sysmsg']       = defaults($_SESSION, 'sysmsg'      , []);
1090                 $_SESSION['sysmsg_info']  = defaults($_SESSION, 'sysmsg_info' , []);
1091                 $_SESSION['last_updated'] = defaults($_SESSION, 'last_updated', []);
1092
1093                 /*
1094                  * check_config() is responsible for running update scripts. These automatically
1095                  * update the DB schema whenever we push a new one out. It also checks to see if
1096                  * any addons have been added or removed and reacts accordingly.
1097                  */
1098
1099                 // in install mode, any url loads install module
1100                 // but we need "view" module for stylesheet
1101                 if ($this->getMode()->isInstall() && $this->module != 'view') {
1102                         $this->module = 'install';
1103                 } elseif (!$this->getMode()->has(App\Mode::MAINTENANCEDISABLED) && $this->module != 'view') {
1104                         $this->module = 'maintenance';
1105                 } else {
1106                         $this->checkURL();
1107                         Core\Update::check($this->getBasePath(), false, $this->getMode());
1108                         Core\Addon::loadAddons();
1109                         Core\Hook::loadHooks();
1110                 }
1111
1112                 $this->page = [
1113                         'aside' => '',
1114                         'bottom' => '',
1115                         'content' => '',
1116                         'footer' => '',
1117                         'htmlhead' => '',
1118                         'nav' => '',
1119                         'page_title' => '',
1120                         'right_aside' => '',
1121                         'template' => '',
1122                         'title' => ''
1123                 ];
1124
1125                 if (strlen($this->module)) {
1126                         // Compatibility with the Android Diaspora client
1127                         if ($this->module == 'stream') {
1128                                 $this->internalRedirect('network?f=&order=post');
1129                         }
1130
1131                         if ($this->module == 'conversations') {
1132                                 $this->internalRedirect('message');
1133                         }
1134
1135                         if ($this->module == 'commented') {
1136                                 $this->internalRedirect('network?f=&order=comment');
1137                         }
1138
1139                         if ($this->module == 'liked') {
1140                                 $this->internalRedirect('network?f=&order=comment');
1141                         }
1142
1143                         if ($this->module == 'activity') {
1144                                 $this->internalRedirect('network/?f=&conv=1');
1145                         }
1146
1147                         if (($this->module == 'status_messages') && ($this->cmd == 'status_messages/new')) {
1148                                 $this->internalRedirect('bookmarklet');
1149                         }
1150
1151                         if (($this->module == 'user') && ($this->cmd == 'user/edit')) {
1152                                 $this->internalRedirect('settings');
1153                         }
1154
1155                         if (($this->module == 'tag_followings') && ($this->cmd == 'tag_followings/manage')) {
1156                                 $this->internalRedirect('search');
1157                         }
1158
1159                         // Compatibility with the Firefox App
1160                         if (($this->module == "users") && ($this->cmd == "users/sign_in")) {
1161                                 $this->module = "login";
1162                         }
1163
1164                         /*
1165                          * ROUTING
1166                          *
1167                          * From the request URL, routing consists of obtaining the name of a BaseModule-extending class of which the
1168                          * post() and/or content() static methods can be respectively called to produce a data change or an output.
1169                          */
1170
1171                         // First we try explicit routes defined in App\Router
1172                         $this->router->collectRoutes();
1173
1174                         $data = $this->router->getRouteCollector();
1175                         Hook::callAll('route_collection', $data);
1176
1177                         $this->module_class = $this->router->getModuleClass($this->cmd);
1178
1179                         // Then we try addon-provided modules that we wrap in the LegacyModule class
1180                         if (!$this->module_class && Core\Addon::isEnabled($this->module) && file_exists("addon/{$this->module}/{$this->module}.php")) {
1181                                 //Check if module is an app and if public access to apps is allowed or not
1182                                 $privateapps = $this->config->get('config', 'private_addons', false);
1183                                 if ((!local_user()) && Core\Hook::isAddonApp($this->module) && $privateapps) {
1184                                         info(Core\L10n::t("You must be logged in to use addons. "));
1185                                 } else {
1186                                         include_once "addon/{$this->module}/{$this->module}.php";
1187                                         if (function_exists($this->module . '_module')) {
1188                                                 LegacyModule::setModuleFile("addon/{$this->module}/{$this->module}.php");
1189                                                 $this->module_class = 'Friendica\\LegacyModule';
1190                                         }
1191                                 }
1192                         }
1193
1194                         // Then we try name-matching a Friendica\Module class
1195                         if (!$this->module_class && class_exists('Friendica\\Module\\' . ucfirst($this->module))) {
1196                                 $this->module_class = 'Friendica\\Module\\' . ucfirst($this->module);
1197                         }
1198
1199                         /* Finally, we look for a 'standard' program module in the 'mod' directory
1200                          * We emulate a Module class through the LegacyModule class
1201                          */
1202                         if (!$this->module_class && file_exists("mod/{$this->module}.php")) {
1203                                 LegacyModule::setModuleFile("mod/{$this->module}.php");
1204                                 $this->module_class = 'Friendica\\LegacyModule';
1205                         }
1206
1207                         /* The URL provided does not resolve to a valid module.
1208                          *
1209                          * On Dreamhost sites, quite often things go wrong for no apparent reason and they send us to '/internal_error.html'.
1210                          * We don't like doing this, but as it occasionally accounts for 10-20% or more of all site traffic -
1211                          * we are going to trap this and redirect back to the requested page. As long as you don't have a critical error on your page
1212                          * this will often succeed and eventually do the right thing.
1213                          *
1214                          * Otherwise we are going to emit a 404 not found.
1215                          */
1216                         if (!$this->module_class) {
1217                                 // Stupid browser tried to pre-fetch our Javascript img template. Don't log the event or return anything - just quietly exit.
1218                                 if (!empty($_SERVER['QUERY_STRING']) && preg_match('/{[0-9]}/', $_SERVER['QUERY_STRING']) !== 0) {
1219                                         exit();
1220                                 }
1221
1222                                 if (!empty($_SERVER['QUERY_STRING']) && ($_SERVER['QUERY_STRING'] === 'q=internal_error.html') && isset($dreamhost_error_hack)) {
1223                                         Core\Logger::log('index.php: dreamhost_error_hack invoked. Original URI =' . $_SERVER['REQUEST_URI']);
1224                                         $this->internalRedirect($_SERVER['REQUEST_URI']);
1225                                 }
1226
1227                                 Core\Logger::log('index.php: page not found: ' . $_SERVER['REQUEST_URI'] . ' ADDRESS: ' . $_SERVER['REMOTE_ADDR'] . ' QUERY: ' . $_SERVER['QUERY_STRING'], Core\Logger::DEBUG);
1228
1229                                 header($_SERVER["SERVER_PROTOCOL"] . ' 404 ' . Core\L10n::t('Not Found'));
1230                                 $tpl = Core\Renderer::getMarkupTemplate("404.tpl");
1231                                 $this->page['content'] = Core\Renderer::replaceMacros($tpl, [
1232                                         '$message' =>  Core\L10n::t('Page not found.')
1233                                 ]);
1234                         }
1235                 }
1236
1237                 $content = '';
1238
1239                 // Initialize module that can set the current theme in the init() method, either directly or via App->profile_uid
1240                 if ($this->module_class) {
1241                         $this->page['page_title'] = $this->module;
1242                         $placeholder = '';
1243
1244                         Core\Hook::callAll($this->module . '_mod_init', $placeholder);
1245
1246                         call_user_func([$this->module_class, 'init']);
1247
1248                         // "rawContent" is especially meant for technical endpoints.
1249                         // This endpoint doesn't need any theme initialization or other comparable stuff.
1250                         if (!$this->error) {
1251                                 call_user_func([$this->module_class, 'rawContent']);
1252                         }
1253                 }
1254
1255                 // Load current theme info after module has been initialized as theme could have been set in module
1256                 $theme_info_file = 'view/theme/' . $this->getCurrentTheme() . '/theme.php';
1257                 if (file_exists($theme_info_file)) {
1258                         require_once $theme_info_file;
1259                 }
1260
1261                 if (function_exists(str_replace('-', '_', $this->getCurrentTheme()) . '_init')) {
1262                         $func = str_replace('-', '_', $this->getCurrentTheme()) . '_init';
1263                         $func($this);
1264                 }
1265
1266                 if ($this->module_class) {
1267                         if (! $this->error && $_SERVER['REQUEST_METHOD'] === 'POST') {
1268                                 Core\Hook::callAll($this->module . '_mod_post', $_POST);
1269                                 call_user_func([$this->module_class, 'post']);
1270                         }
1271
1272                         if (! $this->error) {
1273                                 Core\Hook::callAll($this->module . '_mod_afterpost', $placeholder);
1274                                 call_user_func([$this->module_class, 'afterpost']);
1275                         }
1276
1277                         if (! $this->error) {
1278                                 $arr = ['content' => $content];
1279                                 Core\Hook::callAll($this->module . '_mod_content', $arr);
1280                                 $content = $arr['content'];
1281                                 $arr = ['content' => call_user_func([$this->module_class, 'content'])];
1282                                 Core\Hook::callAll($this->module . '_mod_aftercontent', $arr);
1283                                 $content .= $arr['content'];
1284                         }
1285                 }
1286
1287                 // initialise content region
1288                 if ($this->getMode()->isNormal()) {
1289                         Core\Hook::callAll('page_content_top', $this->page['content']);
1290                 }
1291
1292                 $this->page['content'] .= $content;
1293
1294                 /* Create the page head after setting the language
1295                  * and getting any auth credentials.
1296                  *
1297                  * Moved initHead() and initFooter() to after
1298                  * all the module functions have executed so that all
1299                  * theme choices made by the modules can take effect.
1300                  */
1301                 $this->initHead();
1302
1303                 /* Build the page ending -- this is stuff that goes right before
1304                  * the closing </body> tag
1305                  */
1306                 $this->initFooter();
1307
1308                 /* now that we've been through the module content, see if the page reported
1309                  * a permission problem and if so, a 403 response would seem to be in order.
1310                  */
1311                 if (stristr(implode("", $_SESSION['sysmsg']), Core\L10n::t('Permission denied'))) {
1312                         header($_SERVER["SERVER_PROTOCOL"] . ' 403 ' . Core\L10n::t('Permission denied.'));
1313                 }
1314
1315                 if (!$this->isAjax()) {
1316                         Core\Hook::callAll('page_end', $this->page['content']);
1317                 }
1318
1319                 // Add the navigation (menu) template
1320                 if ($this->module != 'install' && $this->module != 'maintenance') {
1321                         $this->page['htmlhead'] .= Core\Renderer::replaceMacros(Core\Renderer::getMarkupTemplate('nav_head.tpl'), []);
1322                         $this->page['nav']       = Content\Nav::build($this);
1323                 }
1324
1325                 // Build the page - now that we have all the components
1326                 if (isset($_GET["mode"]) && (($_GET["mode"] == "raw") || ($_GET["mode"] == "minimal"))) {
1327                         $doc = new DOMDocument();
1328
1329                         $target = new DOMDocument();
1330                         $target->loadXML("<root></root>");
1331
1332                         $content = mb_convert_encoding($this->page["content"], 'HTML-ENTITIES', "UTF-8");
1333
1334                         /// @TODO one day, kill those error-surpressing @ stuff, or PHP should ban it
1335                         @$doc->loadHTML($content);
1336
1337                         $xpath = new DOMXPath($doc);
1338
1339                         $list = $xpath->query("//*[contains(@id,'tread-wrapper-')]");  /* */
1340
1341                         foreach ($list as $item) {
1342                                 $item = $target->importNode($item, true);
1343
1344                                 // And then append it to the target
1345                                 $target->documentElement->appendChild($item);
1346                         }
1347
1348                         if ($_GET["mode"] == "raw") {
1349                                 header("Content-type: text/html; charset=utf-8");
1350
1351                                 echo substr($target->saveHTML(), 6, -8);
1352
1353                                 exit();
1354                         }
1355                 }
1356
1357                 $page    = $this->page;
1358                 $profile = $this->profile;
1359
1360                 header("X-Friendica-Version: " . FRIENDICA_VERSION);
1361                 header("Content-type: text/html; charset=utf-8");
1362
1363                 if ($this->config->get('system', 'hsts') && ($this->baseURL->getSSLPolicy() == BaseUrl::SSL_POLICY_FULL)) {
1364                         header("Strict-Transport-Security: max-age=31536000");
1365                 }
1366
1367                 // Some security stuff
1368                 header('X-Content-Type-Options: nosniff');
1369                 header('X-XSS-Protection: 1; mode=block');
1370                 header('X-Permitted-Cross-Domain-Policies: none');
1371                 header('X-Frame-Options: sameorigin');
1372
1373                 // Things like embedded OSM maps don't work, when this is enabled
1374                 // 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'");
1375
1376                 /* We use $_GET["mode"] for special page templates. So we will check if we have
1377                  * to load another page template than the default one.
1378                  * The page templates are located in /view/php/ or in the theme directory.
1379                  */
1380                 if (isset($_GET["mode"])) {
1381                         $template = Core\Theme::getPathForFile($_GET["mode"] . '.php');
1382                 }
1383
1384                 // If there is no page template use the default page template
1385                 if (empty($template)) {
1386                         $template = Core\Theme::getPathForFile("default.php");
1387                 }
1388
1389                 // Theme templates expect $a as an App instance
1390                 $a = $this;
1391
1392                 // Used as is in view/php/default.php
1393                 $lang = Core\L10n::getCurrentLang();
1394
1395                 /// @TODO Looks unsafe (remote-inclusion), is maybe not but Core\Theme::getPathForFile() uses file_exists() but does not escape anything
1396                 require_once $template;
1397         }
1398
1399         /**
1400          * Redirects to another module relative to the current Friendica base.
1401          * If you want to redirect to a external URL, use System::externalRedirectTo()
1402          *
1403          * @param string $toUrl The destination URL (Default is empty, which is the default page of the Friendica node)
1404          * @param bool $ssl if true, base URL will try to get called with https:// (works just for relative paths)
1405          *
1406          * @throws InternalServerErrorException In Case the given URL is not relative to the Friendica node
1407          */
1408         public function internalRedirect($toUrl = '', $ssl = false)
1409         {
1410                 if (!empty(parse_url($toUrl, PHP_URL_SCHEME))) {
1411                         throw new InternalServerErrorException("'$toUrl is not a relative path, please use System::externalRedirectTo");
1412                 }
1413
1414                 $redirectTo = $this->getBaseURL($ssl) . '/' . ltrim($toUrl, '/');
1415                 Core\System::externalRedirect($redirectTo);
1416         }
1417
1418         /**
1419          * Automatically redirects to relative or absolute URL
1420          * Should only be used if it isn't clear if the URL is either internal or external
1421          *
1422          * @param string $toUrl The target URL
1423          * @throws InternalServerErrorException
1424          */
1425         public function redirect($toUrl)
1426         {
1427                 if (!empty(parse_url($toUrl, PHP_URL_SCHEME))) {
1428                         Core\System::externalRedirect($toUrl);
1429                 } else {
1430                         $this->internalRedirect($toUrl);
1431                 }
1432         }
1433 }