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