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<?php
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/**
 * @file
 * Install, update and uninstall functions for the system module.
 */
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use Drupal\Component\FileSystem\FileSystem as FileSystemComponent;
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use Drupal\Component\Utility\Bytes;
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use Drupal\Component\Utility\Crypt;
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use Drupal\Component\Utility\Environment;
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use Drupal\Component\Utility\OpCodeCache;
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use Drupal\Component\Utility\Unicode;
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use Drupal\Core\Database\Database;
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use Drupal\Core\DrupalKernel;
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use Drupal\Core\Entity\Sql\SqlContentEntityStorage;
use Drupal\Core\Entity\Sql\SqlContentEntityStorageSchema;
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use Drupal\Core\File\FileSystemInterface;
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use Drupal\Core\Site\Settings;
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use Drupal\Core\StreamWrapper\PrivateStream;
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use Drupal\Core\StreamWrapper\PublicStream;
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use Drupal\Core\StringTranslation\PluralTranslatableMarkup;
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use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Url;
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use Symfony\Component\HttpFoundation\Request;
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/**
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 * Implements hook_requirements().
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 */
function system_requirements($phase) {
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  global $install_state;
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  // Reset the extension lists.
  \Drupal::service('extension.list.module')->reset();
  \Drupal::service('extension.list.theme')->reset();
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  $requirements = [];
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  // Report Drupal version
  if ($phase == 'runtime') {
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    $requirements['drupal'] = [
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      'title' => t('Drupal'),
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      'value' => \Drupal::VERSION,
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      'severity' => REQUIREMENT_INFO,
      'weight' => -10,
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    ];
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    // Display the currently active installation profile, if the site
    // is not running the default installation profile.
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    $profile = \Drupal::installProfile();
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    if ($profile != 'standard') {
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      $info = \Drupal::service('extension.list.module')->getExtensionInfo($profile);
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      $requirements['install_profile'] = [
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        'title' => t('Installation profile'),
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        'value' => t('%profile_name (%profile-%version)', [
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          '%profile_name' => $info['name'],
          '%profile' => $profile,
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          '%version' => $info['version'],
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        ]),
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        'severity' => REQUIREMENT_INFO,
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        'weight' => -9,
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      ];
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    }
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    // Warn if any experimental modules are installed.
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    $experimental_modules = [];
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    $enabled_modules = \Drupal::moduleHandler()->getModuleList();
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    foreach ($enabled_modules as $module => $data) {
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      $info = \Drupal::service('extension.list.module')->getExtensionInfo($module);
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      if (isset($info['package']) && $info['package'] === 'Core (Experimental)') {
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        $experimental_modules[$module] = $info['name'];
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      }
    }
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    if (!empty($experimental_modules)) {
      $requirements['experimental_modules'] = [
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        'title' => t('Experimental modules enabled'),
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        'value' => t('Experimental modules found: %module_list. <a href=":url">Experimental modules</a> are provided for testing purposes only. Use at your own risk.', ['%module_list' => implode(', ', $experimental_modules), ':url' => 'https://www.drupal.org/core/experimental']),
        'severity' => REQUIREMENT_WARNING,
      ];
    }
    // Warn if any experimental themes are installed.
    $experimental_themes = [];
    $installed_themes = \Drupal::service('theme_handler')->listInfo();
    foreach ($installed_themes as $theme => $data) {
      if (isset($data->info['experimental']) && $data->info['experimental']) {
        $experimental_themes[$theme] = $data->info['name'];
      }
    }
    if (!empty($experimental_themes)) {
      $requirements['experimental_themes'] = [
        'title' => t('Experimental themes enabled'),
        'value' => t('Experimental themes found: %theme_list. Experimental themes are provided for testing purposes only. Use at your own risk.', ['%theme_list' => implode(', ', $experimental_themes)]),
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        'severity' => REQUIREMENT_WARNING,
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      ];
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    }
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  }

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  // Web server information.
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  $request_object = \Drupal::request();
  $software = $request_object->server->get('SERVER_SOFTWARE');
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  $requirements['webserver'] = [
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    'title' => t('Web server'),
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    'value' => $software,
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  ];
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  // Tests clean URL support.
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  if ($phase == 'install' && $install_state['interactive'] && !$request_object->query->has('rewrite') && strpos($software, 'Apache') !== FALSE) {
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    // If the Apache rewrite module is not enabled, Apache version must be >=
    // 2.2.16 because of the FallbackResource directive in the root .htaccess
    // file. Since the Apache version reported by the server is dependent on the
    // ServerTokens setting in httpd.conf, we may not be able to determine if a
    // given config is valid. Thus we are unable to use version_compare() as we
    // need have three possible outcomes: the version of Apache is greater than
    // 2.2.16, is less than 2.2.16, or cannot be determined accurately. In the
    // first case, we encourage the use of mod_rewrite; in the second case, we
    // raise an error regarding the minimum Apache version; in the third case,
    // we raise a warning that the current version of Apache may not be
    // supported.
    $rewrite_warning = FALSE;
    $rewrite_error = FALSE;
    $apache_version_string = 'Apache';

    // Determine the Apache version number: major, minor and revision.
    if (preg_match('/Apache\/(\d+)\.?(\d+)?\.?(\d+)?/', $software, $matches)) {
      $apache_version_string = $matches[0];

      // Major version number
      if ($matches[1] < 2) {
        $rewrite_error = TRUE;
      }
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      elseif ($matches[1] == 2) {
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        if (!isset($matches[2])) {
          $rewrite_warning = TRUE;
        }
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        elseif ($matches[2] < 2) {
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          $rewrite_error = TRUE;
        }
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        elseif ($matches[2] == 2) {
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          if (!isset($matches[3])) {
            $rewrite_warning = TRUE;
          }
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          elseif ($matches[3] < 16) {
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            $rewrite_error = TRUE;
          }
        }
      }
    }
    else {
      $rewrite_warning = TRUE;
    }

    if ($rewrite_warning) {
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      $requirements['apache_version'] = [
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        'title' => t('Apache version'),
        'value' => $apache_version_string,
        'severity' => REQUIREMENT_WARNING,
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        'description' => t('Due to the settings for ServerTokens in httpd.conf, it is impossible to accurately determine the version of Apache running on this server. The reported value is @reported, to run Drupal without mod_rewrite, a minimum version of 2.2.16 is needed.', ['@reported' => $apache_version_string]),
      ];
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    }

    if ($rewrite_error) {
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      $requirements['Apache version'] = [
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        'title' => t('Apache version'),
        'value' => $apache_version_string,
        'severity' => REQUIREMENT_ERROR,
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        'description' => t('The minimum version of Apache needed to run Drupal without mod_rewrite enabled is 2.2.16. See the <a href=":link">enabling clean URLs</a> page for more information on mod_rewrite.', [':link' => 'http://drupal.org/docs/8/clean-urls-in-drupal-8']),
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      ];
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    }

    if (!$rewrite_error && !$rewrite_warning) {
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      $requirements['rewrite_module'] = [
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        'title' => t('Clean URLs'),
        'value' => t('Disabled'),
        'severity' => REQUIREMENT_WARNING,
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        'description' => t('Your server is capable of using clean URLs, but it is not enabled. Using clean URLs gives an improved user experience and is recommended. <a href=":link">Enable clean URLs</a>', [':link' => 'http://drupal.org/docs/8/clean-urls-in-drupal-8']),
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      ];
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    }
  }

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  // Verify the user is running a supported PHP version.
  // If the site is running a recommended version of PHP, just display it
  // as an informational message on the status report. This will be overridden
  // with an error or warning if the site is running older PHP versions for
  // which Drupal has already or will soon drop support.
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  $phpversion = $phpversion_label = phpversion();
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  if (function_exists('phpinfo')) {
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    if ($phase === 'runtime') {
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      $phpversion_label = t('@phpversion (<a href=":url">more information</a>)', ['@phpversion' => $phpversion, ':url' => (new Url('system.php'))->toString()]);
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    }
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    $requirements['php'] = [
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      'title' => t('PHP'),
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      'value' => $phpversion_label,
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    ];
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  }
  else {
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    // @todo Revisit whether this description makes sense in
    //   https://www.drupal.org/project/drupal/issues/2927318.
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    $requirements['php'] = [
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      'title' => t('PHP'),
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      'value' => $phpversion_label,
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      'description' => t('The phpinfo() function has been disabled for security reasons. To see your server\'s phpinfo() information, change your PHP settings or contact your server administrator. For more information, <a href=":phpinfo">Enabling and disabling phpinfo()</a> handbook page.', [':phpinfo' => 'https://www.drupal.org/node/243993']),
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      'severity' => REQUIREMENT_INFO,
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    ];
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  }

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  // Check if the PHP version is below what Drupal supports.
  if (version_compare($phpversion, DRUPAL_MINIMUM_SUPPORTED_PHP) < 0) {
    $requirements['php']['description'] = t('Your PHP installation is too old. Drupal requires at least PHP %version. It is recommended to upgrade to PHP version %recommended or higher for the best ongoing support. See <a href="http://php.net/supported-versions.php">PHP\'s version support documentation</a> and the <a href=":php_requirements">Drupal 8 PHP requirements handbook page</a> for more information.',
      [
        '%version' => DRUPAL_MINIMUM_SUPPORTED_PHP,
        '%recommended' => DRUPAL_RECOMMENDED_PHP,
        ':php_requirements' => 'https://www.drupal.org/docs/8/system-requirements/php',
      ]
    );
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    $requirements['php']['severity'] = REQUIREMENT_ERROR;
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    // If the PHP version is also below the absolute minimum allowed, it's not
    // safe to continue with the requirements check.
    if (version_compare($phpversion, DRUPAL_MINIMUM_PHP) < 0) {
      return $requirements;
    }
    // Otherwise downgrade the error to a warning during updates. Even if there
    // are some problems with the site's PHP version, it's still better for the
    // site to keep its Drupal codebase up to date.
    elseif ($phase === 'update') {
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      $requirements['php']['severity'] = REQUIREMENT_WARNING;
    }
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    // Since we allow sites with unsupported PHP versions to still run Drupal
    // updates, we also need to be able to run tests with those PHP versions,
    // which requires the ability to install test sites. Not all tests are
    // required to pass on these PHP versions, but we want to monitor which
    // ones do and don't.
    elseif ($phase === 'install' && drupal_valid_test_ua()) {
      $requirements['php']['severity'] = REQUIREMENT_INFO;
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    }
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  }
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  // For PHP versions that are still supported but no longer recommended,
  // inform users of what's recommended, allowing them to take action before it
  // becomes urgent.
  elseif ($phase === 'runtime' && version_compare($phpversion, DRUPAL_RECOMMENDED_PHP) < 0) {
    $requirements['php']['description'] = t('It is recommended to upgrade to PHP version %recommended or higher for the best ongoing support.  See <a href="http://php.net/supported-versions.php">PHP\'s version support documentation</a> and the <a href=":php_requirements">Drupal 8 PHP requirements handbook page</a> for more information.', ['%recommended' => DRUPAL_RECOMMENDED_PHP, ':php_requirements' => 'https://www.drupal.org/docs/8/system-requirements/php']);
    $requirements['php']['severity'] = REQUIREMENT_INFO;
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  }

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  // Test for PHP extensions.
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  $requirements['php_extensions'] = [
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    'title' => t('PHP extensions'),
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  ];
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  $missing_extensions = [];
  $required_extensions = [
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    'date',
    'dom',
    'filter',
    'gd',
    'hash',
    'json',
    'pcre',
    'pdo',
    'session',
    'SimpleXML',
    'SPL',
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    'tokenizer',
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    'xml',
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  ];
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  foreach ($required_extensions as $extension) {
    if (!extension_loaded($extension)) {
      $missing_extensions[] = $extension;
    }
  }

  if (!empty($missing_extensions)) {
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    $description = t('Drupal requires you to enable the PHP extensions in the following list (see the <a href=":system_requirements">system requirements page</a> for more information):', [
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      ':system_requirements' => 'https://www.drupal.org/requirements',
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    ]);
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    // We use twig inline_template to avoid twig's autoescape.
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    $description = [
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      '#type' => 'inline_template',
      '#template' => '{{ description }}{{ missing_extensions }}',
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      '#context' => [
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        'description' => $description,
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        'missing_extensions' => [
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          '#theme' => 'item_list',
          '#items' => $missing_extensions,
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        ],
      ],
    ];
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    $requirements['php_extensions']['value'] = t('Disabled');
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    $requirements['php_extensions']['severity'] = REQUIREMENT_ERROR;
    $requirements['php_extensions']['description'] = $description;
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  }
  else {
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    $requirements['php_extensions']['value'] = t('Enabled');
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  }

  if ($phase == 'install' || $phase == 'runtime') {
    // Check to see if OPcache is installed.
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    if (!OpCodeCache::isEnabled()) {
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      $requirements['php_opcache'] = [
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        'value' => t('Not enabled'),
        'severity' => REQUIREMENT_WARNING,
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        'description' => t('PHP OPcode caching can improve your site\'s performance considerably. It is <strong>highly recommended</strong> to have <a href="http://php.net/manual/opcache.installation.php" target="_blank">OPcache</a> installed on your server.'),
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      ];
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    }
    else {
      $requirements['php_opcache']['value'] = t('Enabled');
    }
    $requirements['php_opcache']['title'] = t('PHP OPcode caching');
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  }
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  // Check to see if APCu is installed and configured correctly.
  if ($phase == 'runtime' && PHP_SAPI != 'cli') {
    $requirements['php_apcu']['title'] = t('PHP APCu caching');
    if (extension_loaded('apcu') && filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN)) {
      $memory_info = apcu_sma_info(TRUE);
      $apcu_actual_size = format_size($memory_info['seg_size']);
      $apcu_recommended_size = '32 MB';
      $requirements['php_apcu']['value'] = t('Enabled (@size)', ['@size' => $apcu_actual_size]);
      if (Bytes::toInt($apcu_actual_size) < Bytes::toInt($apcu_recommended_size)) {
        $requirements['php_apcu']['severity'] = REQUIREMENT_WARNING;
        $requirements['php_apcu']['description'] = t('Depending on your configuration, Drupal can run with a @apcu_size APCu limit. However, a @apcu_default_size APCu limit (the default) or above is recommended, especially if your site uses additional custom or contributed modules.', [
          '@apcu_size' => $apcu_actual_size,
          '@apcu_default_size' => $apcu_recommended_size,
        ]);
      }
      else {
        $memory_available = $memory_info['avail_mem'] / $memory_info['seg_size'];
        if ($memory_available < 0.1) {
          $requirements['php_apcu']['severity'] = REQUIREMENT_ERROR;
        }
        elseif ($memory_available < 0.25) {
          $requirements['php_apcu']['severity'] = REQUIREMENT_WARNING;
        }
        else {
          $requirements['php_apcu']['severity'] = REQUIREMENT_OK;
        }
        $requirements['php_apcu']['description'] = t('Memory available: @available.', [
          '@available' => format_size($memory_info['avail_mem']),
        ]);
      }
    }
    else {
      $requirements['php_apcu'] += [
        'value' => t('Not enabled'),
        'severity' => REQUIREMENT_INFO,
        'description' => t('PHP APCu caching can improve your site\'s performance considerably. It is <strong>highly recommended</strong> to have <a href="https://www.php.net/manual/apcu.installation.php" target="_blank">APCu</a> installed on your server.'),
      ];
    }
  }

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  if ($phase != 'update') {
    // Test whether we have a good source of random bytes.
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    $requirements['php_random_bytes'] = [
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      'title' => t('Random number generation'),
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    ];
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    try {
      $bytes = random_bytes(10);
      if (strlen($bytes) != 10) {
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        throw new \Exception(t('Tried to generate 10 random bytes, generated @count', ['@count' => strlen($bytes)]));
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      }
      $requirements['php_random_bytes']['value'] = t('Successful');
    }
    catch (\Exception $e) {
      // If /dev/urandom is not available on a UNIX-like system, check whether
      // open_basedir restrictions are the cause.
      $open_basedir_blocks_urandom = FALSE;
      if (DIRECTORY_SEPARATOR === '/' && !@is_readable('/dev/urandom')) {
        $open_basedir = ini_get('open_basedir');
        if ($open_basedir) {
          $open_basedir_paths = explode(PATH_SEPARATOR, $open_basedir);
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          $open_basedir_blocks_urandom = !array_intersect(['/dev', '/dev/', '/dev/urandom'], $open_basedir_paths);
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        }
      }
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      $args = [
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        ':drupal-php' => 'https://www.drupal.org/docs/8/system-requirements/php-requirements',
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        '%exception_message' => $e->getMessage(),
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      ];
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      if ($open_basedir_blocks_urandom) {
        $requirements['php_random_bytes']['description'] = t('Drupal is unable to generate highly randomized numbers, which means certain security features like password reset URLs are not as secure as they should be. Instead, only a slow, less-secure fallback generator is available. The most likely cause is that open_basedir restrictions are in effect and /dev/urandom is not on the whitelist. See the <a href=":drupal-php">system requirements</a> page for more information. %exception_message', $args);
      }
      else {
        $requirements['php_random_bytes']['description'] = t('Drupal is unable to generate highly randomized numbers, which means certain security features like password reset URLs are not as secure as they should be. Instead, only a slow, less-secure fallback generator is available. See the <a href=":drupal-php">system requirements</a> page for more information. %exception_message', $args);
      }
      $requirements['php_random_bytes']['value'] = t('Less secure');
      $requirements['php_random_bytes']['severity'] = REQUIREMENT_ERROR;
    }
  }

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  if ($phase == 'install' || $phase == 'update') {
    // Test for PDO (database).
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    $requirements['database_extensions'] = [
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      'title' => t('Database support'),
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    ];
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    // Make sure PDO is available.
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    $database_ok = extension_loaded('pdo');
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    if (!$database_ok) {
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      $pdo_message = t('Your web server does not appear to support PDO (PHP Data Objects). Ask your hosting provider if they support the native PDO extension. See the <a href=":link">system requirements</a> page for more information.', [
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        ':link' => 'https://www.drupal.org/requirements/pdo',
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      ]);
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    }
    else {
      // Make sure at least one supported database driver exists.
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      $drivers = drupal_detect_database_types();
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      if (empty($drivers)) {
        $database_ok = FALSE;
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        $pdo_message = t('Your web server does not appear to support any common PDO database extensions. Check with your hosting provider to see if they support PDO (PHP Data Objects) and offer any databases that <a href=":drupal-databases">Drupal supports</a>.', [
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          ':drupal-databases' => 'https://www.drupal.org/requirements/database',
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        ]);
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      }
      // Make sure the native PDO extension is available, not the older PEAR
      // version. (See install_verify_pdo() for details.)
      if (!defined('PDO::ATTR_DEFAULT_FETCH_MODE')) {
        $database_ok = FALSE;
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        $pdo_message = t('Your web server seems to have the wrong version of PDO installed. Drupal requires the PDO extension from PHP core. This system has the older PECL version. See the <a href=":link">system requirements</a> page for more information.', [
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          ':link' => 'https://www.drupal.org/requirements/pdo#pecl',
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        ]);
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      }
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    }
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    if (!$database_ok) {
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      $requirements['database_extensions']['value'] = t('Disabled');
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      $requirements['database_extensions']['severity'] = REQUIREMENT_ERROR;
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      $requirements['database_extensions']['description'] = $pdo_message;
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    }
    else {
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      $requirements['database_extensions']['value'] = t('Enabled');
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    }
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  }
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  else {
    // Database information.
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    $class = Database::getConnection()->getDriverClass('Install\\Tasks');
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    $tasks = new $class();
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    $requirements['database_system'] = [
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      'title' => t('Database system'),
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      'value' => $tasks->name(),
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    ];
    $requirements['database_system_version'] = [
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      'title' => t('Database system version'),
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      'value' => Database::getConnection()->version(),
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    ];
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  }
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  // Test PHP memory_limit
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  $memory_limit = ini_get('memory_limit');
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  $requirements['php_memory_limit'] = [
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    'title' => t('PHP memory limit'),
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    'value' => $memory_limit == -1 ? t('-1 (Unlimited)') : $memory_limit,
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  ];
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  if (!Environment::checkMemoryLimit(DRUPAL_MINIMUM_PHP_MEMORY_LIMIT, $memory_limit)) {
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    $description = [];
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    if ($phase == 'install') {
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      $description['phase'] = t('Consider increasing your PHP memory limit to %memory_minimum_limit to help prevent errors in the installation process.', ['%memory_minimum_limit' => DRUPAL_MINIMUM_PHP_MEMORY_LIMIT]);
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    }
    elseif ($phase == 'update') {
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      $description['phase'] = t('Consider increasing your PHP memory limit to %memory_minimum_limit to help prevent errors in the update process.', ['%memory_minimum_limit' => DRUPAL_MINIMUM_PHP_MEMORY_LIMIT]);
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    }
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    elseif ($phase == 'runtime') {
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      $description['phase'] = t('Depending on your configuration, Drupal can run with a %memory_limit PHP memory limit. However, a %memory_minimum_limit PHP memory limit or above is recommended, especially if your site uses additional custom or contributed modules.', ['%memory_limit' => $memory_limit, '%memory_minimum_limit' => DRUPAL_MINIMUM_PHP_MEMORY_LIMIT]);
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    }
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    if (!empty($description['phase'])) {
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      if ($php_ini_path = get_cfg_var('cfg_file_path')) {
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        $description['memory'] = t('Increase the memory limit by editing the memory_limit parameter in the file %configuration-file and then restart your web server (or contact your system administrator or hosting provider for assistance).', ['%configuration-file' => $php_ini_path]);
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      }
      else {
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        $description['memory'] = t('Contact your system administrator or hosting provider for assistance with increasing your PHP memory limit.');
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      }
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      $handbook_link = t('For more information, see the online handbook entry for <a href=":memory-limit">increasing the PHP memory limit</a>.', [':memory-limit' => 'https://www.drupal.org/node/207036']);
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      $description = [
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        '#type' => 'inline_template',
        '#template' => '{{ description_phase }} {{ description_memory }} {{ handbook }}',
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        '#context' => [
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          'description_phase' => $description['phase'],
          'description_memory' => $description['memory'],
          'handbook' => $handbook_link,
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        ],
      ];
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      $requirements['php_memory_limit']['description'] = $description;
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      $requirements['php_memory_limit']['severity'] = REQUIREMENT_WARNING;
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    }
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  }
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  // Test configuration files and directory for writability.
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  if ($phase == 'runtime') {
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    $conf_errors = [];
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    // Find the site path. Kernel service is not always available at this point,
    // but is preferred, when available.
    if (\Drupal::hasService('kernel')) {
494
      $site_path = \Drupal::getContainer()->getParameter('site.path');
495 496 497 498
    }
    else {
      $site_path = DrupalKernel::findSitePath(Request::createFromGlobals());
    }
499 500 501 502
    // Allow system administrators to disable permissions hardening for the site
    // directory. This allows additional files in the site directory to be
    // updated when they are managed in a version control system.
    if (Settings::get('skip_permissions_hardening')) {
503
      $error_value = t('Protection disabled');
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      // If permissions hardening is disabled, then only show a warning for a
      // writable file, as a reminder, rather than an error.
      $file_protection_severity = REQUIREMENT_WARNING;
    }
    else {
509
      $error_value = t('Not protected');
510 511 512
      // In normal operation, writable files or directories are an error.
      $file_protection_severity = REQUIREMENT_ERROR;
      if (!drupal_verify_install_file($site_path, FILE_NOT_WRITABLE, 'dir')) {
513
        $conf_errors[] = t("The directory %file is not protected from modifications and poses a security risk. You must change the directory's permissions to be non-writable.", ['%file' => $site_path]);
514
      }
515
    }
516
    foreach (['settings.php', 'settings.local.php', 'services.yml'] as $conf_file) {
517
      $full_path = $site_path . '/' . $conf_file;
518
      if (file_exists($full_path) && !drupal_verify_install_file($full_path, FILE_EXIST | FILE_READABLE | FILE_NOT_WRITABLE, 'file', !Settings::get('skip_permissions_hardening'))) {
519
        $conf_errors[] = t("The file %file is not protected from modifications and poses a security risk. You must change the file's permissions to be non-writable.", ['%file' => $full_path]);
520 521 522 523 524 525 526
      }
    }
    if (!empty($conf_errors)) {
      if (count($conf_errors) == 1) {
        $description = $conf_errors[0];
      }
      else {
527
        // We use twig inline_template to avoid double escaping.
528
        $description = [
529 530
          '#type' => 'inline_template',
          '#template' => '{{ configuration_error_list }}',
531 532
          '#context' => [
            'configuration_error_list' => [
533 534
              '#theme' => 'item_list',
              '#items' => $conf_errors,
535 536 537
            ],
          ],
        ];
538
      }
539
      $requirements['configuration_files'] = [
540
        'value' => $error_value,
541
        'severity' => $file_protection_severity,
542
        'description' => $description,
543
      ];
544 545
    }
    else {
546
      $requirements['configuration_files'] = [
547
        'value' => t('Protected'),
548
      ];
549
    }
550
    $requirements['configuration_files']['title'] = t('Configuration files');
551 552
  }

553 554 555 556
  // Test the contents of the .htaccess files.
  if ($phase == 'runtime') {
    // Try to write the .htaccess files first, to prevent false alarms in case
    // (for example) the /tmp directory was wiped.
557 558 559 560 561
    /** @var \Drupal\Core\File\HtaccessWriterInterface $htaccessWriter */
    $htaccessWriter = \Drupal::service("file.htaccess_writer");
    $htaccessWriter->ensure();
    foreach ($htaccessWriter->defaultProtectedDirs() as $protected_dir) {
      $htaccess_file = $protected_dir->getPath() . '/.htaccess';
562 563 564
      // Check for the string which was added to the recommended .htaccess file
      // in the latest security update.
      if (!file_exists($htaccess_file) || !($contents = @file_get_contents($htaccess_file)) || strpos($contents, 'Drupal_Security_Do_Not_Remove_See_SA_2013_003') === FALSE) {
565
        $url = 'https://www.drupal.org/SA-CORE-2013-003';
566
        $requirements[$htaccess_file] = [
567
          'title' => new TranslatableMarkup($protected_dir->getTitle()),
568 569
          'value' => t('Not fully protected'),
          'severity' => REQUIREMENT_ERROR,
570
          'description' => t('See <a href=":url">@url</a> for information about the recommended .htaccess file which should be added to the %directory directory to help protect against arbitrary code execution.', [':url' => $url, '@url' => $url, '%directory' => $protected_dir->getPath()]),
571
        ];
572 573 574 575
      }
    }
  }

576
  // Report cron status.
577
  if ($phase == 'runtime') {
578
    $cron_config = \Drupal::config('system.cron');
579
    // Cron warning threshold defaults to two days.
580
    $threshold_warning = $cron_config->get('threshold.requirements_warning');
581
    // Cron error threshold defaults to two weeks.
582
    $threshold_error = $cron_config->get('threshold.requirements_error');
583

584
    // Determine when cron last ran.
585
    $cron_last = \Drupal::state()->get('system.cron_last');
586
    if (!is_numeric($cron_last)) {
587
      $cron_last = \Drupal::state()->get('install_time', 0);
588
    }
589

590
    // Determine severity based on time since cron last ran.
591
    $severity = REQUIREMENT_INFO;
592
    if (REQUEST_TIME - $cron_last > $threshold_error) {
593
      $severity = REQUIREMENT_ERROR;
594
    }
595
    elseif (REQUEST_TIME - $cron_last > $threshold_warning) {
596 597 598 599
      $severity = REQUIREMENT_WARNING;
    }

    // Set summary and description based on values determined above.
600
    $summary = t('Last run @time ago', ['@time' => \Drupal::service('date.formatter')->formatTimeDiffSince($cron_last)]);
601

602
    $requirements['cron'] = [
603
      'title' => t('Cron maintenance tasks'),
604 605
      'severity' => $severity,
      'value' => $summary,
606
    ];
607 608 609 610 611 612 613
    if ($severity != REQUIREMENT_INFO) {
      $requirements['cron']['description'][] = [
        [
          '#markup' => t('Cron has not run recently.'),
          '#suffix' => ' ',
        ],
        [
614
          '#markup' => t('For more information, see the online handbook entry for <a href=":cron-handbook">configuring cron jobs</a>.', [':cron-handbook' => 'https://www.drupal.org/cron']),
615 616 617 618 619 620
          '#suffix' => ' ',
        ],
      ];
    }
    $requirements['cron']['description'][] = [
      [
621 622 623 624 625
        '#type' => 'link',
        '#prefix' => '(',
        '#title' => t('more information'),
        '#suffix' => ')',
        '#url' => Url::fromRoute('system.cron_settings'),
626 627
      ],
      [
628 629 630 631 632
        '#prefix' => '<span class="cron-description__run-cron">',
        '#suffix' => '</span>',
        '#type' => 'link',
        '#title' => t('Run cron'),
        '#url' => Url::fromRoute('system.run_cron'),
633 634
      ],
    ];
635
  }
636
  if ($phase != 'install') {
637
    $filesystem_config = \Drupal::config('system.file');
638
    $directories = [
639
      PublicStream::basePath(),
640 641
      // By default no private files directory is configured. For private files
      // to be secure the admin needs to provide a path outside the webroot.
642
      PrivateStream::basePath(),
643
      \Drupal::service('file_system')->getTempDirectory(),
644
    ];
645
  }
646

647 648
  // During an install we need to make assumptions about the file system
  // unless overrides are provided in settings.php.
649
  if ($phase == 'install') {
650
    $directories = [];
651
    if ($file_public_path = Settings::get('file_public_path')) {
652
      $directories[] = $file_public_path;
653 654 655
    }
    else {
      // If we are installing Drupal, the settings.php file might not exist yet
656
      // in the intended site directory, so don't require it.
657 658 659
      $request = Request::createFromGlobals();
      $site_path = DrupalKernel::findSitePath($request);
      $directories[] = $site_path . '/files';
660
    }
661 662
    if ($file_private_path = Settings::get('file_private_path')) {
      $directories[] = $file_private_path;
663
    }
664 665
    if (Settings::get('file_temp_path')) {
      $directories[] = Settings::get('file_temp_path');
666 667 668 669
    }
    else {
      // If the temporary directory is not overridden use an appropriate
      // temporary path for the system.
670
      $directories[] = FileSystemComponent::getOsTemporaryDirectory();
671
    }
672 673
  }

674 675 676
  // Check the config directory if it is defined in settings.php. If it isn't
  // defined, the installer will create a valid config directory later, but
  // during runtime we must always display an error.
677 678 679 680 681 682 683 684 685
  $config_sync_directory = Settings::get('config_sync_directory');
  if (!empty($config_sync_directory)) {
    // If we're installing Drupal try and create the config sync directory.
    if (!is_dir($config_sync_directory) && $phase == 'install') {
      \Drupal::service('file_system')->prepareDirectory($config_sync_directory, FileSystemInterface::CREATE_DIRECTORY | FileSystemInterface::MODIFY_PERMISSIONS);
    }
    if (!is_dir($config_sync_directory)) {
      if ($phase == 'install') {
        $description = t('An automated attempt to create the directory %directory failed, possibly due to a permissions problem. To proceed with the installation, either create the directory and modify its permissions manually or ensure that the installer has the permissions to create it automatically. For more information, see INSTALL.txt or the <a href=":handbook_url">online handbook</a>.', ['%directory' => $config_sync_directory, ':handbook_url' => 'https://www.drupal.org/server-permissions']);
686
      }
687 688
      else {
        $description = t('The directory %directory does not exist.', ['%directory' => $config_sync_directory]);
689
      }
690 691 692 693 694
      $requirements['config sync directory'] = [
        'title' => t('Configuration sync directory'),
        'description' => $description,
        'severity' => REQUIREMENT_ERROR,
      ];
695
    }
696
  }
697 698 699
  if ($phase != 'install' && empty($config_sync_directory)) {
    $requirements['config sync directory'] = [
      'title' => t('Configuration sync directory'),
700
      'value' => t('Not present'),
701
      'description' => t("Your %file file must define the %setting setting as a string containing the directory in which configuration files can be found.", ['%file' => $site_path . '/settings.php', '%setting' => "\$settings['config_sync_directory']"]),
702
      'severity' => REQUIREMENT_ERROR,
703
    ];
704 705
  }

706
  $requirements['file system'] = [
707
    'title' => t('File system'),
708
  ];
709

710 711 712
  $error = '';
  // For installer, create the directories if possible.
  foreach ($directories as $directory) {
713 714 715
    if (!$directory) {
      continue;
    }
716
    if ($phase == 'install') {
717
      \Drupal::service('file_system')->prepareDirectory($directory, FileSystemInterface::CREATE_DIRECTORY | FileSystemInterface::MODIFY_PERMISSIONS);
718
    }
719 720 721 722
    $is_writable = is_writable($directory);
    $is_directory = is_dir($directory);
    if (!$is_writable || !$is_directory) {
      $description = '';
723
      $requirements['file system']['value'] = t('Not writable');
724
      if (!$is_directory) {
725
        $error = t('The directory %directory does not exist.', ['%directory' => $directory]);
726 727
      }
      else {
728
        $error = t('The directory %directory is not writable.', ['%directory' => $directory]);
729 730 731
      }
      // The files directory requirement check is done only during install and runtime.
      if ($phase == 'runtime') {
732
        $description = t('You may need to set the correct directory at the <a href=":admin-file-system">file system settings page</a> or change the current directory\'s permissions so that it is writable.', [':admin-file-system' => Url::fromRoute('system.file_system_settings')->toString()]);
733 734 735 736
      }
      elseif ($phase == 'install') {
        // For the installer UI, we need different wording. 'value' will
        // be treated as version, so provide none there.
737
        $description = t('An automated attempt to create this directory failed, possibly due to a permissions problem. To proceed with the installation, either create the directory and modify its permissions manually or ensure that the installer has the permissions to create it automatically. For more information, see INSTALL.txt or the <a href=":handbook_url">online handbook</a>.', [':handbook_url' => 'https://www.drupal.org/server-permissions']);
738 739 740
        $requirements['file system']['value'] = '';
      }
      if (!empty($description)) {
741
        $description = [
742 743
          '#type' => 'inline_template',
          '#template' => '{{ error }} {{ description }}',
744
          '#context' => [
745 746
            'error' => $error,
            'description' => $description,
747