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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\Utility\Crypt;
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use Drupal\Component\Utility\Environment;
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use Drupal\Component\FileSystem\FileSystem;
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use Drupal\Component\Utility\OpCodeCache;
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use Drupal\Core\Path\AliasStorage;
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use Drupal\Core\Url;
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use Drupal\Core\Database\Database;
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use Drupal\Core\DrupalKernel;
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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\system\SystemRequirements;
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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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  $requirements = array();

  // Report Drupal version
  if ($phase == 'runtime') {
    $requirements['drupal'] = array(
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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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    $profile = drupal_get_profile();
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    if ($profile != 'standard') {
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      $info = system_get_info('module', $profile);
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      $requirements['install_profile'] = array(
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        'title' => t('Installation profile'),
        'value' => t('%profile_name (%profile-%version)', array(
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          '%profile_name' => $info['name'],
          '%profile' => $profile,
          '%version' => $info['version']
        )),
        'severity' => REQUIREMENT_INFO,
        'weight' => -9
      );
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    }
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    // Warn if any experimental modules are installed.
    $experimental = array();
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    $enabled_modules = \Drupal::moduleHandler()->getModuleList();
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    foreach ($enabled_modules as $module => $data) {
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      $info = system_get_info('module', $module);
      if ($info['package'] === 'Core (Experimental)') {
        $experimental[$module] = $info['name'];
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      }
    }
    if (!empty($experimental)) {
      $requirements['experimental'] = array(
        '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.', array('%module_list' => implode(', ', $experimental), ':url' => 'https://www.drupal.org/core/experimental')),
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        'severity' => REQUIREMENT_WARNING,
      );
    }
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  }

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  // Web server information.
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  $software = \Drupal::request()->server->get('SERVER_SOFTWARE');
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  $requirements['webserver'] = array(
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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.
  if ($phase == 'install' && $install_state['interactive'] && !isset($_GET['rewrite']) && strpos($software, 'Apache') !== FALSE) {
    // 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) {
      $requirements['apache_version'] = array (
        'title' => t('Apache version'),
        'value' => $apache_version_string,
        'severity' => REQUIREMENT_WARNING,
        '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.', array('@reported' => $apache_version_string)),
      );
    }

    if ($rewrite_error) {
      $requirements['Apache version'] = array (
        '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.', array(':link' => 'http://drupal.org/node/15365')),
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      );
    }

    if (!$rewrite_error && !$rewrite_warning) {
      $requirements['rewrite_module'] = array (
        '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>', array(':link' => 'http://drupal.org/node/15365')),
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      );
    }
  }

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  // Test PHP version and show link to phpinfo() if it's available
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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'] = array(
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      'title' => t('PHP'),
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      'value' => $phpversion_label,
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    );
  }
  else {
    $requirements['php'] = array(
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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.', array(':phpinfo' => 'https://www.drupal.org/node/243993')),
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      'severity' => REQUIREMENT_INFO,
    );
  }

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  if (version_compare($phpversion, DRUPAL_MINIMUM_PHP) < 0) {
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    $requirements['php']['description'] = t('Your PHP installation is too old. Drupal requires at least PHP %version.', array('%version' => DRUPAL_MINIMUM_PHP));
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    $requirements['php']['severity'] = REQUIREMENT_ERROR;
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    // If PHP is old, it's not safe to continue with the requirements check.
    return $requirements;
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  }
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  // Suggest to update to at least 5.5.21 or 5.6.5 for disabling multiple
  // statements.
  if (($phase === 'install' || \Drupal::database()->driver() === 'mysql') && !SystemRequirements::phpVersionWithPdoDisallowMultipleStatements($phpversion)) {
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    $requirements['php'] = array(
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      'title' => t('PHP (multiple statement disabling)'),
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      'value' => $phpversion_label,
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      'description' => t('PHP versions higher than 5.6.5 or 5.5.21 provide built-in SQL injection protection for mysql databases. It is recommended to update.'),
      'severity' => REQUIREMENT_INFO,
    );
  }

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  // Test for PHP extensions.
  $requirements['php_extensions'] = array(
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    'title' => t('PHP extensions'),
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  );
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  $missing_extensions = array();
  $required_extensions = array(
    'date',
    'dom',
    'filter',
    'gd',
    'hash',
    'json',
    'pcre',
    'pdo',
    'session',
    'SimpleXML',
    'SPL',
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    'tokenizer',
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    'xml',
  );
  foreach ($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):', array(
      ':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.
    $description = array(
      '#type' => 'inline_template',
      '#template' => '{{ description }}{{ missing_extensions }}',
      '#context' => array(
        'description' => $description,
        'missing_extensions' => array(
          '#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'] = array(
        '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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      );
    }
    else {
      $requirements['php_opcache']['value'] = t('Enabled');
    }
    $requirements['php_opcache']['title'] = t('PHP OPcode caching');
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  }
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  if ($phase != 'update') {
    // Test whether we have a good source of random bytes.
    $requirements['php_random_bytes'] = array(
      'title' => t('Random number generation'),
    );
    try {
      $bytes = random_bytes(10);
      if (strlen($bytes) != 10) {
        throw new \Exception(t('Tried to generate 10 random bytes, generated @count', array('@count' => strlen($bytes))));
      }
      $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);
          $open_basedir_blocks_urandom = !array_intersect(array('/dev', '/dev/', '/dev/urandom'), $open_basedir_paths);
        }
      }
      $args = array(
        ':drupal-php' => 'https://www.drupal.org/docs/7/system-requirements/php#csprng',
        '%exception_message' => $e->getMessage(),
      );
      if ($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).
    $requirements['database_extensions'] = array(
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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.', array(
        ':link' => 'https://www.drupal.org/requirements/pdo',
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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>.', array(
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          ':drupal-databases' => 'https://www.drupal.org/requirements/database',
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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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        $pdo_message = t('Your web server seems to have the wrong version of PDO installed. Drupal requires the PDO extension from PHP core. This system has the older PECL version. See the <a href=":link">system requirements</a> page for more information.', array(
          ':link' => 'https://www.drupal.org/requirements/pdo#pecl',
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        ));
      }
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    }
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    if (!$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();
    $requirements['database_system'] = array(
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      'title' => t('Database system'),
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      'value' => $tasks->name(),
    );
    $requirements['database_system_version'] = array(
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      'title' => t('Database system version'),
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      'value' => Database::getConnection()->version(),
    );
  }
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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'] = array(
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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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    $description = array();
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    if ($phase == 'install') {
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      $description['phase'] = t('Consider increasing your PHP memory limit to %memory_minimum_limit to help prevent errors in the installation process.', array('%memory_minimum_limit' => DRUPAL_MINIMUM_PHP_MEMORY_LIMIT));
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    }
    elseif ($phase == 'update') {
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      $description['phase'] = t('Consider increasing your PHP memory limit to %memory_minimum_limit to help prevent errors in the update process.', array('%memory_minimum_limit' => DRUPAL_MINIMUM_PHP_MEMORY_LIMIT));
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    }
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    elseif ($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.', array('%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).', array('%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>.', array(':memory-limit' => 'https://www.drupal.org/node/207036'));
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      $description = array(
        '#type' => 'inline_template',
        '#template' => '{{ description_phase }} {{ description_memory }} {{ handbook }}',
        '#context' => array(
          'description_phase' => $description['phase'],
          'description_memory' => $description['memory'],
          'handbook' => $handbook_link,
        ),
      );

      $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 = array();
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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')) {
      $site_path = \Drupal::service('site.path');
    }
    else {
      $site_path = DrupalKernel::findSitePath(Request::createFromGlobals());
    }
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    // 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')) {
      $conf_errors[] = t('Protection disabled');
      // 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 {
      // 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')) {
        $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.", array('%file' => $site_path));
      }
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    }
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    foreach (array('settings.php', 'settings.local.php', 'services.yml') as $conf_file) {
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      $full_path = $site_path . '/' . $conf_file;
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      if (file_exists($full_path) && (Settings::get('skip_permissions_hardening') || !drupal_verify_install_file($full_path, FILE_EXIST | FILE_READABLE | FILE_NOT_WRITABLE))) {
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        $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.", array('%file' => $full_path));
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      }
    }
    if (!empty($conf_errors)) {
      if (count($conf_errors) == 1) {
        $description = $conf_errors[0];
      }
      else {
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        // We use twig inline_template to avoid double escaping.
        $description = array(
          '#type' => 'inline_template',
          '#template' => '{{ configuration_error_list }}',
          '#context' => array(
            'configuration_error_list' => array(
              '#theme' => 'item_list',
              '#items' => $conf_errors,
            ),
          ),
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        );
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      }
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      $requirements['configuration_files'] = array(
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        'value' => t('Not protected'),
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        'severity' => $file_protection_severity,
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        'description' => $description,
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      );
    }
    else {
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      $requirements['configuration_files'] = array(
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        'value' => t('Protected'),
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      );
    }
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    $requirements['configuration_files']['title'] = t('Configuration files');
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  }

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  // 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.
    file_ensure_htaccess();
    $htaccess_files['public://.htaccess'] = array(
      'title' => t('Public files directory'),
      'directory' => drupal_realpath('public://'),
    );
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    if (PrivateStream::basePath()) {
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      $htaccess_files['private://.htaccess'] = array(
        'title' => t('Private files directory'),
        'directory' => drupal_realpath('private://'),
      );
    }
    $htaccess_files['temporary://.htaccess'] = array(
      'title' => t('Temporary files directory'),
      'directory' => drupal_realpath('temporary://'),
    );
    foreach ($htaccess_files as $htaccess_file => $info) {
      // Check for the string which was added to the recommended .htaccess file
      // in the latest security update.
      if (!file_exists($htaccess_file) || !($contents = @file_get_contents($htaccess_file)) || strpos($contents, 'Drupal_Security_Do_Not_Remove_See_SA_2013_003') === FALSE) {
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        $url = 'https://www.drupal.org/SA-CORE-2013-003';
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        $requirements[$htaccess_file] = array(
          'title' => $info['title'],
          'value' => t('Not fully protected'),
          'severity' => REQUIREMENT_ERROR,
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          '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.', array(':url' => $url, '@url' => $url, '%directory' => $info['directory'])),
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        );
      }
    }
  }

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  // Report cron status.
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  if ($phase == 'runtime') {
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    $cron_config = \Drupal::config('system.cron');
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    // Cron warning threshold defaults to two days.
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    $threshold_warning = $cron_config->get('threshold.requirements_warning');
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    // Cron error threshold defaults to two weeks.
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    $threshold_error = $cron_config->get('threshold.requirements_error');
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    // Determine when cron last ran.
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    $cron_last = \Drupal::state()->get('system.cron_last');
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    if (!is_numeric($cron_last)) {
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      $cron_last = \Drupal::state()->get('install_time', 0);
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    }
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    // Determine severity based on time since cron last ran.
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    $severity = REQUIREMENT_INFO;
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    if (REQUEST_TIME - $cron_last > $threshold_error) {
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      $severity = REQUIREMENT_ERROR;
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    }
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    elseif (REQUEST_TIME - $cron_last > $threshold_warning) {
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      $severity = REQUIREMENT_WARNING;
    }

    // Set summary and description based on values determined above.
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    $summary = t('Last run @time ago', array('@time' => \Drupal::service('date.formatter')->formatTimeDiffSince($cron_last)));
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    $requirements['cron'] = array(
522
      'title' => t('Cron maintenance tasks'),
523 524 525
      'severity' => $severity,
      'value' => $summary,
    );
526 527 528 529 530 531 532
    if ($severity != REQUIREMENT_INFO) {
      $requirements['cron']['description'][] = [
        [
          '#markup' => t('Cron has not run recently.'),
          '#suffix' => ' ',
        ],
        [
533
          '#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']),
534 535 536 537
          '#suffix' => ' ',
        ],
      ];
    }
538
    $cron_url = \Drupal::url('system.cron', ['key' => \Drupal::state()->get('system.cron_key'), ['absolute' => TRUE]]);
539 540
    $requirements['cron']['description'][] = [
      [
541
        '#markup' => t('You can <a href=":cron">run cron manually</a>.', [':cron' => \Drupal::url('system.run_cron')]),
542 543 544
      ],
      [
        '#prefix' => '<br />',
545
        '#markup' => t('To run cron from outside the site, go to <a href=":url">@cron</a>', [':url' => $cron_url, '@cron' => $cron_url]),
546 547
      ],
    ];
548
  }
549
  if ($phase != 'install') {
550
    $filesystem_config = \Drupal::config('system.file');
551
    $directories = array(
552
      PublicStream::basePath(),
553 554
      // By default no private files directory is configured. For private files
      // to be secure the admin needs to provide a path outside the webroot.
555
      PrivateStream::basePath(),
556 557 558
      file_directory_temp(),
    );
  }
559

560 561
  // During an install we need to make assumptions about the file system
  // unless overrides are provided in settings.php.
562
  if ($phase == 'install') {
563
    $directories = array();
564
    if ($file_public_path = Settings::get('file_public_path')) {
565
      $directories[] = $file_public_path;
566 567 568
    }
    else {
      // If we are installing Drupal, the settings.php file might not exist yet
569
      // in the intended site directory, so don't require it.
570 571 572
      $request = Request::createFromGlobals();
      $site_path = DrupalKernel::findSitePath($request);
      $directories[] = $site_path . '/files';
573
    }
574 575
    if ($file_private_path = Settings::get('file_private_path')) {
      $directories[] = $file_private_path;
576
    }
577 578
    if (!empty($GLOBALS['config']['system.file']['path']['temporary'])) {
      $directories[] = $GLOBALS['config']['system.file']['path']['temporary'];
579 580 581 582
    }
    else {
      // If the temporary directory is not overridden use an appropriate
      // temporary path for the system.
583
      $directories[] = FileSystem::getOsTemporaryDirectory();
584
    }
585 586
  }

587 588 589
  // 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.
590
  if (!empty($GLOBALS['config_directories'])) {
591 592
    foreach (array_keys(array_filter($GLOBALS['config_directories'])) as $type) {
      $directory = config_get_config_directory($type);
593 594 595 596
      // If we're installing Drupal try and create the config sync directory.
      if (!is_dir($directory) && $phase == 'install') {
        file_prepare_directory($directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
      }
597
      if (!is_dir($directory)) {
598 599 600 601 602 603
        if ($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>.', array('%directory' => $directory, ':handbook_url' => 'https://www.drupal.org/server-permissions'));
        }
        else {
          $description = t('The directory %directory does not exist.', array('%directory' => $directory));
        }
604 605
        $requirements['config directory ' . $type] = array(
          'title' => t('Configuration directory: %type', ['%type' => $type]),
606
          'description' => $description,
607 608 609
          'severity' => REQUIREMENT_ERROR,
        );
      }
610
    }
611
  }
612
  if ($phase != 'install' && (empty($GLOBALS['config_directories']) || empty($GLOBALS['config_directories'][CONFIG_SYNC_DIRECTORY]) )) {
613
    $requirements['config directories'] = array(
614 615
      'title' => t('Configuration directories'),
      'value' => t('Not present'),
616
      'description' => t('Your %file file must define the $config_directories variable as an array containing the names of directories in which configuration files can be found. It must contain a %sync_key key.', array('%file' => $site_path . '/settings.php', '%sync_key' => CONFIG_SYNC_DIRECTORY)),
617 618 619 620
      'severity' => REQUIREMENT_ERROR,
    );
  }

621
  $requirements['file system'] = array(
622
    'title' => t('File system'),
623
  );
624

625 626 627
  $error = '';
  // For installer, create the directories if possible.
  foreach ($directories as $directory) {
628 629 630
    if (!$directory) {
      continue;
    }
631
    if ($phase == 'install') {
632
      file_prepare_directory($directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
633
    }
634 635 636 637
    $is_writable = is_writable($directory);
    $is_directory = is_dir($directory);
    if (!$is_writable || !$is_directory) {
      $description = '';
638
      $requirements['file system']['value'] = t('Not writable');
639
      if (!$is_directory) {
640
        $error = t('The directory %directory does not exist.', array('%directory' => $directory));
641 642
      }
      else {
643
        $error = t('The directory %directory is not writable.', array('%directory' => $directory));
644 645 646
      }
      // The files directory requirement check is done only during install and runtime.
      if ($phase == 'runtime') {
647
        $description = t('You may need to set the correct directory at the <a href=":admin-file-system">file system settings page</a> or change the current directory\'s permissions so that it is writable.', array(':admin-file-system' => \Drupal::url('system.file_system_settings')));
648 649 650 651
      }
      elseif ($phase == 'install') {
        // For the installer UI, we need different wording. 'value' will
        // be treated as version, so provide none there.
652
        $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>.', array(':handbook_url' => 'https://www.drupal.org/server-permissions'));
653 654 655
        $requirements['file system']['value'] = '';
      }
      if (!empty($description)) {
656 657 658 659 660 661 662 663
        $description = array(
          '#type' => 'inline_template',
          '#template' => '{{ error }} {{ description }}',
          '#context' => array(
            'error' => $error,
            'description' => $description,
          ),
        );
664 665 666
        $requirements['file system']['description'] = $description;
        $requirements['file system']['severity'] = REQUIREMENT_ERROR;
      }
667 668
    }
    else {
669 670 671
      // This function can be called before the config_cache table has been
      // created.
      if ($phase == 'install' || file_default_scheme() == 'public') {
672
        $requirements['file system']['value'] = t('Writable (<em>public</em> download method)');
673 674
      }
      else {
675
        $requirements['file system']['value'] = t('Writable (<em>private</em> download method)');
676
      }
677 678 679
    }
  }

680 681 682
  // See if updates are available in update.php.
  if ($phase == 'runtime') {
    $requirements['update'] = array(
683 684
      'title' => t('Database updates'),
      'value' => t('Up to date'),
685 686 687
    );

    // Check installed modules.
688
    $has_pending_updates = FALSE;
689
    foreach (\Drupal::moduleHandler()->getModuleList() as $module => $filename) {
690 691 692 693
      $updates = drupal_get_schema_versions($module);
      if ($updates !== FALSE) {
        $default = drupal_get_installed_schema_version($module);
        if (max($updates) > $default) {
694
          $has_pending_updates = TRUE;
695 696 697 698
          break;
        }
      }
    }
699 700 701 702 703 704 705 706 707 708 709 710
    if (!$has_pending_updates) {
      /** @var \Drupal\Core\Update\UpdateRegistry $post_update_registry */
      $post_update_registry = \Drupal::service('update.post_update_registry');
      $missing_post_update_functions = $post_update_registry->getPendingUpdateFunctions();
      if (!empty($missing_post_update_functions)) {
        $has_pending_updates = TRUE;
      }
    }

    if ($has_pending_updates) {
      $requirements['update']['severity'] = REQUIREMENT_ERROR;
      $requirements['update']['value'] = t('Out of date');
711
      $requirements['update']['description'] = t('Some modules have database schema updates to install. You should run the <a href=":update">database update script</a> immediately.', array(':update' => \Drupal::url('system.db_update')));
712
    }
713

714 715 716 717 718
    $requirements['entity_update'] = [
      'title' => t('Entity/field definitions'),
      'value' => t('Up to date'),
    ];
    // Verify that no entity updates are pending.
719 720 721 722 723 724 725 726 727 728 729
    if ($change_list = \Drupal::entityDefinitionUpdateManager()->getChangeSummary()) {
      $build = [];
      foreach ($change_list as $entity_type_id => $changes) {
        $entity_type = \Drupal::entityManager()->getDefinition($entity_type_id);
        $build[] = [
          '#theme' => 'item_list',
          '#title' => $entity_type->getLabel(),
          '#items' => $changes,
        ];
      }

730
      $entity_update_issues = \Drupal::service('renderer')->renderPlain($build);
731 732
      $requirements['entity_update']['severity'] = REQUIREMENT_ERROR;
      $requirements['entity_update']['value'] = t('Mismatched entity and/or field definitions');
733
      $requirements['entity_update']['description'] = t('The following changes were detected in the entity type and field definitions. @updates', ['@updates' => $entity_update_issues]);
734
    }
735 736
  }

737 738
  // Verify the update.php access setting
  if ($phase == 'runtime') {
739
    if (Settings::get('update_free_access')) {
740
      $requirements['update access'] = array(
741
        'value' => t('Not protected'),
742
        'severity' => REQUIREMENT_ERROR,
743
        'description' => t('The update.php script is accessible to everyone without authentication check, which is a security risk. You must change the @settings_name value in your settings.php back to FALSE.', array('@settings_name' => '$settings[\'update_free_access\']')),
744 745 746 747
      );
    }
    else {
      $requirements['update access'] = array(
748
        'value' => t('Protected'),
749 750
      );
    }
751
    $requirements['update access']['title'] = t('Access to update.php');
752 753
  }

754 755
  // Display an error if a newly introduced dependency in a module is not resolved.
  if ($phase == 'update') {
756
    $profile = drupal_get_profile();
757 758
    $files = system_rebuild_module_data();
    foreach ($files as $module => $file) {
759
      // Ignore disabled modules and installation profiles.
760
      if (!$file->status || $module == $profile) {
761 762 763 764 765 766
        continue;
      }
      // Check the module's PHP version.
      $name = $file->info['name'];
      $php = $file->info['php'];
      if (version_compare($php, PHP_VERSION, '>')) {
767
        $requirements['php']['description'] .= t('@name requires at least PHP @version.', array('@name' => $name, '@version' => $php));
768 769 770 771 772 773 774 775
        $requirements['php']['severity'] = REQUIREMENT_ERROR;
      }
      // Check the module's required modules.
      foreach ($file->requires as $requirement) {
        $required_module = $requirement['name'];
        // Check if the module exists.
        if (!isset($files[$required_module])) {
          $requirements["$module-$required_module"] = array(
776 777
            'title' => t('Unresolved dependency'),
            'description' => t('@name requires this module.', array('@name' => $name)),
778 779 780 781 782 783 784 785
            'value' => t('@required_name (Missing)', array('@required_name' => $required_module)),
            'severity' => REQUIREMENT_ERROR,
          );
          continue;
        }
        // Check for an incompatible version.
        $required_file = $files[$required_module];
        $required_name = $required_file->info['name'];
786
        $version = str_replace(\Drupal::CORE_COMPATIBILITY . '-', '', $required_file->info['version']);
787 788 789 790
        $compatibility = drupal_check_incompatibility($requirement, $version);
        if ($compatibility) {
          $compatibility = rtrim(substr($compatibility, 2), ')');
          $requirements["$module-$required_module"] = array(
791 792
            'title' => t('Unresolved dependency'),
            'description' => t('@name requires this module and version. Currently using @required_name version @version', array('@name' => $name, '@required_name' => $required_name, '@version' => $version)),
793 794 795 796 797 798 799 800 801
            'value' => t('@required_name (Version @compatibility required)', array('@required_name' => $required_name, '@compatibility' => $compatibility)),
            'severity' => REQUIREMENT_ERROR,
          );
          continue;
        }
      }
    }
  }

802
  // Test Unicode library
803
  include_once DRUPAL_ROOT . '/core/includes/unicode.inc';
804 805
  $requirements = array_merge($requirements, unicode_requirements());

806
  if ($phase == 'runtime') {
807
    // Check for update status module.
808
    if (!\Drupal::moduleHandler()->moduleExists('update')) {
809
      $requirements['update status'] = array(
810
        'value' => t('Not enabled'),
811
        'severity' => REQUIREMENT_WARNING,
812 813 814
        'description' => t('Update notifications are not enabled. It is <strong>highly recommended</strong> that you enable the Update Manager module from the <a href=":module">module administration page</a> in order to stay up-to-date on new releases. For more information, <a href=":update">Update status handbook page</a>.', array(
          ':update' => 'https://www.drupal.org/documentation/modules/update',
          ':module' => \Drupal::url('system.modules_list'),
815
        )),
816 817 818 819
      );
    }
    else {
      $requirements['update status'] = array(
820
        'value' => t('Enabled'),
821 822
      );
    }
823
    $requirements['update status']['title'] = t('Update notifications');
824

825
    if (Settings::get('rebuild_access')) {
826 827 828 829 830 831 832
      $requirements['rebuild access'] = array(
        'title' => t('Rebuild access'),
        'value' => t('Enabled'),
        'severity' => REQUIREMENT_ERROR,
        'description' => t('The rebuild_access setting is enabled in settings.php. It is recommended to have this setting disabled unless you are performing a rebuild.'),
      );
    }