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<?php

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use Drupal\Component\Utility\UserAgent;
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use Drupal\Component\Utility\Crypt;

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use Drupal\Component\Utility\Settings;
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use Drupal\Core\Config\FileStorage;
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use Drupal\Core\DrupalKernel;
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use Drupal\Core\CoreServiceProvider;
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use Drupal\Core\Database\Database;
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use Drupal\Core\Database\DatabaseExceptionWrapper;
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use Drupal\Core\Database\Install\TaskException;
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use Drupal\Core\Language\Language;
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use Drupal\Core\Language\LanguageManager;
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use Drupal\Core\StringTranslation\Translator\FileTranslation;
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use Drupal\Core\DependencyInjection\ContainerBuilder;
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use Symfony\Component\DependencyInjection\ContainerInterface;
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use Symfony\Component\DependencyInjection\Reference;
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use Symfony\Component\HttpFoundation\Request;
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use Symfony\Component\HttpFoundation\Response;
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use Guzzle\Http\Exception\RequestException;

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/**
 * @file
 * API functions for installing Drupal.
 */

/**
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 * Do not run the task during the current installation request.
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 *
 * This can be used to skip running an installation task when certain
 * conditions are met, even though the task may still show on the list of
 * installation tasks presented to the user. For example, the Drupal installer
 * uses this flag to skip over the database configuration form when valid
 * database connection information is already available from settings.php. It
 * also uses this flag to skip language import tasks when the installation is
 * being performed in English.
 */
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const INSTALL_TASK_SKIP = 1;
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/**
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 * Run the task on each installation request that reaches it.
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 *
 * This is primarily used by the Drupal installer for bootstrap-related tasks.
 */
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const INSTALL_TASK_RUN_IF_REACHED = 2;
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/**
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 * Run the task on each installation request until the database is set up.
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 *
 * This is the default method for running tasks and should be used for most
 * tasks that occur after the database is set up; these tasks will then run
 * once and be marked complete once they are successfully finished. For
 * example, the Drupal installer uses this flag for the batch installation of
 * modules on the new site, and also for the configuration form that collects
 * basic site information and sets up the site maintenance account.
 */
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const INSTALL_TASK_RUN_IF_NOT_COMPLETED = 3;
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/**
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 * Installs Drupal either interactively or via an array of passed-in settings.
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 *
 * The Drupal installation happens in a series of steps, which may be spread
 * out over multiple page requests. Each request begins by trying to determine
 * the last completed installation step (also known as a "task"), if one is
 * available from a previous request. Control is then passed to the task
 * handler, which processes the remaining tasks that need to be run until (a)
 * an error is thrown, (b) a new page needs to be displayed, or (c) the
 * installation finishes (whichever happens first).
 *
 * @param $settings
 *   An optional array of installation settings. Leave this empty for a normal,
 *   interactive, browser-based installation intended to occur over multiple
 *   page requests. Alternatively, if an array of settings is passed in, the
 *   installer will attempt to use it to perform the installation in a single
 *   page request (optimized for the command line) and not send any output
 *   intended for the web browser. See install_state_defaults() for a list of
 *   elements that are allowed to appear in this array.
 *
 * @see install_state_defaults()
 */
function install_drupal($settings = array()) {
  global $install_state;
  // Initialize the installation state with the settings that were passed in,
  // as well as a boolean indicating whether or not this is an interactive
  // installation.
  $interactive = empty($settings);
  $install_state = $settings + array('interactive' => $interactive) + install_state_defaults();
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  // Begin the page request. This adds information about the current state of
  // the Drupal installation to the passed-in array.
  install_begin_request($install_state);
  // Based on the installation state, run the remaining tasks for this page
  // request, and collect any output.
  $output = install_run_tasks($install_state);

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  // After execution, all tasks might be complete, in which case
  // $install_state['installation_finished'] is TRUE. In case the last task
  // has been processed, remove the global $install_state, so other code can
  // reliably check whether it is running during the installer.
  // @see drupal_installation_attempted()
  $state = $install_state;
  if (!empty($install_state['installation_finished'])) {
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    unset($GLOBALS['install_state']);
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  }

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  // All available tasks for this page request are now complete. Interactive
  // installations can send output to the browser or redirect the user to the
  // next page.
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  if ($state['interactive']) {
    if ($state['parameters_changed']) {
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      // Redirect to the correct page if the URL parameters have changed.
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      install_goto(install_redirect_url($state));
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    }
    elseif (isset($output)) {
      // Display a page only if some output is available. Otherwise it is
      // possible that we are printing a JSON page and theme output should
      // not be shown.
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      install_display_output($output, $state);
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    }
  }
}

/**
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 * Returns an array of default settings for the global installation state.
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 *
 * The installation state is initialized with these settings at the beginning
 * of each page request. They may evolve during the page request, but they are
 * initialized again once the next request begins.
 *
 * Non-interactive Drupal installations can override some of these default
 * settings by passing in an array to the installation script, most notably
 * 'parameters' (which contains one-time parameters such as 'profile' and
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 * 'langcode' that are normally passed in via the URL) and 'forms' (which can
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 * be used to programmatically submit forms during the installation; the keys
 * of each element indicate the name of the installation task that the form
 * submission is for, and the values are used as the $form_state['values']
 * array that is passed on to the form submission via drupal_form_submit()).
 *
 * @see drupal_form_submit()
 */
function install_state_defaults() {
  $defaults = array(
    // The current task being processed.
    'active_task' => NULL,
    // The last task that was completed during the previous installation
    // request.
    'completed_task' => NULL,
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    // TRUE when there are valid config directories.
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    'config_verified' => FALSE,
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    // TRUE when there is a valid database connection.
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    'database_verified' => FALSE,
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    // TRUE when a valid settings.php exists (containing both database
    // connection information and config directory names).
    'settings_verified' => FALSE,
    // TRUE when the base system has been installed and is ready to operate.
    'base_system_verified' => FALSE,
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    // Whether a translation file for the selected language will be downloaded
    // from the translation server.
    'download_translation' => FALSE,
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    // An array of forms to be programmatically submitted during the
    // installation. The keys of each element indicate the name of the
    // installation task that the form submission is for, and the values are
    // used as the $form_state['values'] array that is passed on to the form
    // submission via drupal_form_submit().
    'forms' => array(),
    // This becomes TRUE only at the end of the installation process, after
    // all available tasks have been completed and Drupal is fully installed.
    // It is used by the installer to store correct information in the database
    // about the completed installation, as well as to inform theme functions
    // that all tasks are finished (so that the task list can be displayed
    // correctly).
    'installation_finished' => FALSE,
    // Whether or not this installation is interactive. By default this will
    // be set to FALSE if settings are passed in to install_drupal().
    'interactive' => TRUE,
    // An array of parameters for the installation, pre-populated by the URL
    // or by the settings passed in to install_drupal(). This is primarily
    // used to store 'profile' (the name of the chosen installation profile)
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    // and 'langcode' (the code of the chosen installation language), since
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    // these settings need to persist from page request to page request before
    // the database is available for storage.
    'parameters' => array(),
    // Whether or not the parameters have changed during the current page
    // request. For interactive installations, this will trigger a page
    // redirect.
    'parameters_changed' => FALSE,
    // An array of information about the chosen installation profile. This will
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    // be filled in based on the profile's .info.yml file.
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    'profile_info' => array(),
    // An array of available installation profiles.
    'profiles' => array(),
    // An array of server variables that will be substituted into the global
    // $_SERVER array via drupal_override_server_variables(). Used by
    // non-interactive installations only.
    'server' => array(),
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    // The server URL where the interface translation files can be downloaded.
    // Tokens in the pattern will be replaced by appropriate values for the
    // required translation file.
    'server_pattern' => 'http://ftp.drupal.org/files/translations/%core/%project/%project-%version.%language.po',
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    // Installation tasks can set this to TRUE to force the page request to
    // end (even if there is no themable output), in the case of an interactive
    // installation. This is needed only rarely; for example, it would be used
    // by an installation task that prints JSON output rather than returning a
    // themed page. The most common example of this is during batch processing,
    // but the Drupal installer automatically takes care of setting this
    // parameter properly in that case, so that individual installation tasks
    // which implement the batch API do not need to set it themselves.
    'stop_page_request' => FALSE,
    // Installation tasks can set this to TRUE to indicate that the task should
    // be run again, even if it normally wouldn't be. This can be used, for
    // example, if a single task needs to be spread out over multiple page
    // requests, or if it needs to perform some validation before allowing
    // itself to be marked complete. The most common examples of this are batch
    // processing and form submissions, but the Drupal installer automatically
    // takes care of setting this parameter properly in those cases, so that
    // individual installation tasks which implement the batch API or form API
    // do not need to set it themselves.
    'task_not_complete' => FALSE,
    // A list of installation tasks which have already been performed during
    // the current page request.
    'tasks_performed' => array(),
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    // An array of translation files URIs available for the installation. Keyed
    // by the translation language code.
    'translations' => array(),
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  );
  return $defaults;
}

/**
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 * Begins an installation request, modifying the installation state as needed.
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 *
 * This function performs commands that must run at the beginning of every page
 * request. It throws an exception if the installation should not proceed.
 *
 * @param $install_state
 *   An array of information about the current installation state. This is
 *   modified with information gleaned from the beginning of the page request.
 */
function install_begin_request(&$install_state) {
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  // A request object from the HTTPFoundation to tell us about the request.
  $request = Request::createFromGlobals();

  // Create a minimal container so that t() and $request will work. This
  // container will be overriden but it's needed for the very early installation
  // process when database tasks run.
  $container = new ContainerBuilder();
  $container->set('request', $request);
  \Drupal::setContainer($container);

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  // Add any installation parameters passed in via the URL.
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  if ($install_state['interactive']) {
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    $install_state['parameters'] += $request->query->all();
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  }
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  // Validate certain core settings that are used throughout the installation.
  if (!empty($install_state['parameters']['profile'])) {
    $install_state['parameters']['profile'] = preg_replace('/[^a-zA-Z_0-9]/', '', $install_state['parameters']['profile']);
  }
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  if (!empty($install_state['parameters']['langcode'])) {
    $install_state['parameters']['langcode'] = preg_replace('/[^a-zA-Z_0-9\-]/', '', $install_state['parameters']['langcode']);
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  }

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  // Allow command line scripts to override server variables used by Drupal.
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  require_once __DIR__ . '/bootstrap.inc';
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  if (!$install_state['interactive']) {
    drupal_override_server_variables($install_state['server']);
  }

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  // Initialize conf_path().
  // This primes the site path to be used during installation. By not requiring
  // settings.php, a bare site folder can be prepared in the /sites directory,
  // which will be used for installing Drupal.
  conf_path(FALSE);

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  // If the hash salt leaks, it becomes possible to forge a valid testing user
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  // agent, install a new copy of Drupal, and take over the original site.
  // The user agent header is used to pass a database prefix in the request when
  // running tests. However, for security reasons, it is imperative that no
  // installation be permitted using such a prefix.
  if ($install_state['interactive'] && strpos($request->server->get('HTTP_USER_AGENT'), 'simpletest') !== FALSE && !drupal_valid_test_ua()) {
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    header($request->server->get('SERVER_PROTOCOL') . ' 403 Forbidden');
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    exit;
  }

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  drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);

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  // Ensure that procedural dependencies are loaded as early as possible,
  // since the error/exception handlers depend on them.
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  require_once __DIR__ . '/../modules/system/system.install';
  require_once __DIR__ . '/common.inc';
  require_once __DIR__ . '/file.inc';
  require_once __DIR__ . '/install.inc';
  require_once __DIR__ . '/schema.inc';
  require_once __DIR__ . '/../../' . settings()->get('path_inc', 'core/includes/path.inc');
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  require_once __DIR__ . '/database.inc';
  require_once __DIR__ . '/form.inc';
  require_once __DIR__ . '/batch.inc';
  require_once __DIR__ . '/ajax.inc';
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  // Load module basics (needed for hook invokes).
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  include_once __DIR__ . '/module.inc';
  include_once __DIR__ . '/session.inc';
  require_once __DIR__ . '/entity.inc';
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  // If we have a language selected and it is not yet saved in the system (eg.
  // pre-database data screens we are unable to persistently store the default
  // language), we should set language_default so the proper language is used to
  // display installer pages as early as possible.
  $default_language_values = Language::$defaultValues;
  if (!empty($install_state['parameters']['langcode']) && $default_language_values['id'] != $install_state['parameters']['langcode']) {
    $default_language_values = array('id' => $install_state['parameters']['langcode']);
  }
  // Register the 'language_manager' service.
  $container->setParameter('language.default_values', $default_language_values);
  $container->register('language.default', 'Drupal\Core\Language\LanguageDefault')
    ->addArgument('%language.default_values%');
  $container->register('language_manager', 'Drupal\Core\Language\LanguageManager')
    ->addArgument(new Reference('language.default'));

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  // Register the translation services.
  install_register_translation_service($container);
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  \Drupal::setContainer($container);
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  // Determine whether base system services are ready to operate.
  $install_state['config_verified'] = install_verify_config_directory(CONFIG_ACTIVE_DIRECTORY) && install_verify_config_directory(CONFIG_STAGING_DIRECTORY);
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  $install_state['database_verified'] = install_verify_database_settings();
  $install_state['settings_verified'] = $install_state['config_verified'] && $install_state['database_verified'];
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  if ($install_state['settings_verified']) {
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    try {
      $system_schema = system_schema();
      end($system_schema);
      $table = key($system_schema);
      $install_state['base_system_verified'] = Database::getConnection()->schema()->tableExists($table);
    }
    catch (DatabaseExceptionWrapper $e) {
      // The last defined table of the base system_schema() does not exist yet.
      // $install_state['base_system_verified'] defaults to FALSE, so the code
      // following below will use the minimal installer service container.
      // As soon as the base system is verified here, the installer operates in
      // a full and regular Drupal environment, without any kind of exceptions.
    }
  }

  if ($install_state['base_system_verified']) {
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    $kernel = new DrupalKernel('install', drupal_classloader(), FALSE);
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    $kernel->boot();
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    $container = $kernel->getContainer();
    // Add the file translation service to the container.
    $container->set('string_translator.file_translation', install_file_translation_service());
    $container->get('string_translation')->addTranslator($container->get('string_translator.file_translation'));
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  }
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  // Replace services with in-memory implementations and specialized installer
  // implementations. This service container is reverted to a regular
  // DrupalKernel in install_bootstrap_full().
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  else {
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    // @todo Move into a proper Drupal\Core\DependencyInjection\InstallContainerBuilder.
    $container = new ContainerBuilder();
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    $container->register('event_dispatcher', 'Symfony\Component\EventDispatcher\EventDispatcher');
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    $container->register('config.storage', 'Drupal\Core\Config\InstallStorage');
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    $container->register('config.storage.schema', 'Drupal\Core\Config\Schema\SchemaStorage')
      ->addArgument(new Reference('config.storage'));
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    $container->register('config.typed', 'Drupal\Core\Config\TypedConfigManager')
      ->addArgument(new Reference('config.storage'))
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      ->addArgument(new Reference('config.storage.schema'))
      ->addArgument(new Reference('cache.config'));
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    $container->setParameter('language.default_values', Language::$defaultValues);
    $container->register('language.default', 'Drupal\Core\Language\LanguageDefault')
      ->addArgument('%language.default_values%');

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    $container->register('config.factory', 'Drupal\Core\Config\ConfigFactory')
      ->addArgument(new Reference('config.storage'))
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      ->addArgument(new Reference('event_dispatcher'))
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      ->addArgument(new Reference('config.typed'));
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    // Register the 'language_manager' service.
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    $container->register('language_manager', 'Drupal\Core\Language\LanguageManager')
      ->addArgument(new Reference('language.default'));
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    // Register the translation services.
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    install_register_translation_service($container);
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    foreach (array('bootstrap', 'config', 'cache', 'menu', 'page', 'path') as $bin) {
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      $container
        ->register("cache.$bin", 'Drupal\Core\Cache\MemoryBackend')
        ->addArgument($bin);
    }
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    // The install process cannot use the database lock backend since the database
    // is not fully up, so we use a null backend implementation during the
    // installation process. This will also speed up the installation process.
    // The site being installed will use the real lock backend when doing AJAX
    // requests but, except for a WSOD, there is no chance for a a lock to stall
    // (as opposed to the cache backend) so we can afford having a null
    // implementation here.
    $container->register('lock', 'Drupal\Core\Lock\NullLockBackend');
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    $container
      ->register('theme.registry', 'Drupal\Core\Theme\Registry')
      ->addArgument(new Reference('cache.cache'))
      ->addArgument(new Reference('lock'))
      ->addArgument(new Reference('module_handler'))
      ->addTag('needs_destruction');

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    // Register a module handler for managing enabled modules.
    $container
      ->register('module_handler', 'Drupal\Core\Extension\ModuleHandler');
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    // Register the Guzzle HTTP client for fetching translation files from a
    // remote translation server such as localization.drupal.org.
    $container->register('http_default_client', 'Guzzle\Http\Client')
      ->addArgument(NULL)
      ->addArgument(array(
        'curl.CURLOPT_TIMEOUT' => 30.0,
        'curl.CURLOPT_MAXREDIRS' => 3,
      ))
      ->addMethodCall('setUserAgent', array('Drupal (+http://drupal.org/)'));

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    $container->register('settings', 'Drupal\Component\Utility\Settings')
      ->setFactoryClass('Drupal\Component\Utility\Settings')
      ->setFactoryMethod('getSingleton');
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    $container
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      ->register('keyvalue', 'Drupal\Core\KeyValueStore\KeyValueMemoryFactory');
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    $container
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      ->register('keyvalue.expirable', 'Drupal\Core\KeyValueStore\KeyValueNullExpirableFactory');
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    $container->register('state', 'Drupal\Core\KeyValueStore\State')
      ->addArgument(new Reference('keyvalue'));
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    // Register Twig template engine for use during install.
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    CoreServiceProvider::registerTwig($container);
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    $container->register('url_generator', 'Drupal\Core\Routing\NullGenerator');

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    $container->register('form_builder', 'Drupal\Core\Form\FormBuilder')
      ->addArgument(new Reference('module_handler'))
      ->addArgument(new Reference('keyvalue.expirable'))
      ->addArgument(new Reference('event_dispatcher'))
      ->addArgument(new Reference('url_generator'))
      ->addArgument(new Reference('string_translation'))
      ->addArgument(new Reference('csrf_token', ContainerInterface::IGNORE_ON_INVALID_REFERENCE))
      ->addArgument(new Reference('http_kernel', ContainerInterface::IGNORE_ON_INVALID_REFERENCE))
      ->addMethodCall('setRequest', array(new Reference('request')));

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    // Register UUID.
    CoreServiceProvider::registerUuid($container);

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    // Register the CSS and JavaScript asset collection renderers.
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    $container->register('asset.css.collection_renderer', 'Drupal\Core\Asset\CssCollectionRenderer')
      ->addArgument(new Reference('state'));
    $container->register('asset.js.collection_renderer', 'Drupal\Core\Asset\JsCollectionRenderer')
      ->addArgument(new Reference('state'));
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    // Register the info parser.
    $container->register('info_parser', 'Drupal\Core\Extension\InfoParser');
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    $container->register('theme_handler', 'Drupal\Core\Extension\ThemeHandler')
      ->addArgument(new Reference('config.factory'))
      ->addArgument(new Reference('module_handler'))
      ->addArgument(new Reference('cache.cache'))
      ->addArgument(new Reference('info_parser'));
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    // Overrides can not work at this point since this would cause the
    // ConfigFactory to try to load language override configuration which is not
    // supported by \Drupal\Core\Config\InstallStorage since loading a
    // non-existing file would throw an exception.
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    $container->get('config.factory')->setOverrideState(FALSE);
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  }
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  // Set the request in the kernel to the new created Request above
  // so it is available to the rest of the installation process.
  $container->set('request', $request);

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  \Drupal::setContainer($container);
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  // Set up $language, so t() caller functions will still work.
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  drupal_language_initialize();
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  // Add in installation language if present.
  if (isset($install_state['parameters']['langcode'])) {
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    \Drupal::translation()->setDefaultLangcode($install_state['parameters']['langcode']);
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  }
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  $module_handler = \Drupal::moduleHandler();
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  if (!$module_handler->moduleExists('system')) {
    // Override the module list with a minimal set of modules.
    $module_handler->setModuleList(array('system' => 'core/modules/system/system.module'));
  }
  $module_handler->load('system');
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  // Prepare for themed output. We need to run this at the beginning of the
  // page request to avoid a different theme accidentally getting set. (We also
  // need to run it even in the case of command-line installations, to prevent
  // any code in the installer that happens to initialize the theme system from
  // accessing the database before it is set up yet.)
  drupal_maintenance_theme();
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  if ($install_state['database_verified']) {
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    // Verify the last completed task in the database, if there is one.
    $task = install_verify_completed_task();
  }
  else {
    $task = NULL;

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    // Do not install over a configured settings.php.
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    if (!empty($GLOBALS['databases'])) {
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      throw new Exception(install_already_done_error());
    }
  }

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  // Ensure that the active configuration directory is empty before installation
  // starts.
  if ($install_state['config_verified'] && empty($task)) {
    $config = glob(config_get_config_directory(CONFIG_ACTIVE_DIRECTORY) . '/*.' . FileStorage::getFileExtension());
    if (!empty($config)) {
      $task = NULL;
      throw new Exception(install_already_done_error());
    }
  }

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  // Modify the installation state as appropriate.
  $install_state['completed_task'] = $task;
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  // Add the list of available profiles to the installation state.
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  $install_state['profiles'] += drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.profile$/', 'profiles');
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}

/**
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 * Runs all tasks for the current installation request.
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 *
 * In the case of an interactive installation, all tasks will be attempted
 * until one is reached that has output which needs to be displayed to the
 * user, or until a page redirect is required. Otherwise, tasks will be
 * attempted until the installation is finished.
 *
 * @param $install_state
 *   An array of information about the current installation state. This is
 *   passed along to each task, so it can be modified if necessary.
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 *
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 * @return
 *   HTML output from the last completed task.
 */
function install_run_tasks(&$install_state) {
  do {
    // Obtain a list of tasks to perform. The list of tasks itself can be
    // dynamic (e.g., some might be defined by the installation profile,
    // which is not necessarily known until the earlier tasks have run),
    // so we regenerate the remaining tasks based on the installation state,
    // each time through the loop.
    $tasks_to_perform = install_tasks_to_perform($install_state);
    // Run the first task on the list.
    reset($tasks_to_perform);
    $task_name = key($tasks_to_perform);
    $task = array_shift($tasks_to_perform);
    $install_state['active_task'] = $task_name;
    $original_parameters = $install_state['parameters'];
    $output = install_run_task($task, $install_state);
    $install_state['parameters_changed'] = ($install_state['parameters'] != $original_parameters);
    // Store this task as having been performed during the current request,
    // and save it to the database as completed, if we need to and if the
    // database is in a state that allows us to do so. Also mark the
    // installation as 'done' when we have run out of tasks.
    if (!$install_state['task_not_complete']) {
      $install_state['tasks_performed'][] = $task_name;
      $install_state['installation_finished'] = empty($tasks_to_perform);
574
      if ($task['run'] == INSTALL_TASK_RUN_IF_NOT_COMPLETED || $install_state['installation_finished']) {
575
        \Drupal::state()->set('install_task', $install_state['installation_finished'] ? 'done' : $task_name);
576 577 578 579 580 581 582 583 584 585 586 587
      }
    }
    // Stop when there are no tasks left. In the case of an interactive
    // installation, also stop if we have some output to send to the browser,
    // the URL parameters have changed, or an end to the page request was
    // specifically called for.
    $finished = empty($tasks_to_perform) || ($install_state['interactive'] && (isset($output) || $install_state['parameters_changed'] || $install_state['stop_page_request']));
  } while (!$finished);
  return $output;
}

/**
588
 * Runs an individual installation task.
589 590 591 592 593 594
 *
 * @param $task
 *   An array of information about the task to be run.
 * @param $install_state
 *   An array of information about the current installation state. This is
 *   passed in by reference so that it can be modified by the task.
595
 *
596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628
 * @return
 *   The output of the task function, if there is any.
 */
function install_run_task($task, &$install_state) {
  $function = $task['function'];

  if ($task['type'] == 'form') {
    if ($install_state['interactive']) {
      // For interactive forms, build the form and ensure that it will not
      // redirect, since the installer handles its own redirection only after
      // marking the form submission task complete.
      $form_state = array(
        // We need to pass $install_state by reference in order for forms to
        // modify it, since the form API will use it in call_user_func_array(),
        // which requires that referenced variables be passed explicitly.
        'build_info' => array('args' => array(&$install_state)),
        'no_redirect' => TRUE,
      );
      $form = drupal_build_form($function, $form_state);
      // If a successful form submission did not occur, the form needs to be
      // rendered, which means the task is not complete yet.
      if (empty($form_state['executed'])) {
        $install_state['task_not_complete'] = TRUE;
        return drupal_render($form);
      }
      // Otherwise, return nothing so the next task will run in the same
      // request.
      return;
    }
    else {
      // For non-interactive forms, submit the form programmatically with the
      // values taken from the installation state. Throw an exception if any
      // errors were encountered.
629 630 631 632 633 634 635 636
      $form_state = array(
        'values' => !empty($install_state['forms'][$function]) ? $install_state['forms'][$function] : array(),
        // We need to pass $install_state by reference in order for forms to
        // modify it, since the form API will use it in call_user_func_array(),
        // which requires that referenced variables be passed explicitly.
        'build_info' => array('args' => array(&$install_state)),
      );
      drupal_form_submit($function, $form_state);
637
      $errors = form_get_errors($form_state);
638 639 640 641 642 643 644 645 646
      if (!empty($errors)) {
        throw new Exception(implode("\n", $errors));
      }
    }
  }

  elseif ($task['type'] == 'batch') {
    // Start a new batch based on the task function, if one is not running
    // already.
647
    $current_batch = \Drupal::state()->get('install_current_batch');
648 649 650 651 652 653 654 655 656 657 658 659
    if (!$install_state['interactive'] || !$current_batch) {
      $batch = $function($install_state);
      if (empty($batch)) {
        // If the task did some processing and decided no batch was necessary,
        // there is nothing more to do here.
        return;
      }
      batch_set($batch);
      // For interactive batches, we need to store the fact that this batch
      // task is currently running. Otherwise, we need to make sure the batch
      // will complete in one page request.
      if ($install_state['interactive']) {
660
        \Drupal::state()->set('install_current_batch', $function);
661 662 663 664 665 666 667
      }
      else {
        $batch =& batch_get();
        $batch['progressive'] = FALSE;
      }
      // Process the batch. For progressive batches, this will redirect.
      // Otherwise, the batch will complete.
668 669 670 671 672 673 674 675
      $response = batch_process(install_redirect_url($install_state), install_full_redirect_url($install_state));
      if ($response instanceof Response) {
        // Save $_SESSION data from batch.
        drupal_session_commit();
        // Send the response.
        $response->send();
        exit;
      }
676 677 678 679
    }
    // If we are in the middle of processing this batch, keep sending back
    // any output from the batch process, until the task is complete.
    elseif ($current_batch == $function) {
680
      $output = _batch_page(\Drupal::request());
681
      // Because Batch API now returns a JSON response for intermediary steps,
682 683 684 685
      // but the installer doesn't handle Response objects yet, just send the
      // output here and emulate the old model.
      // @todo Replace this when we refactor the installer to use a request-
      //   response workflow.
686 687
      if ($output instanceof Response) {
        $output->send();
688
        $output = NULL;
689
      }
690 691 692
      // The task is complete when we try to access the batch page and receive
      // FALSE in return, since this means we are at a URL where we are no
      // longer requesting a batch ID.
693
      if ($output === FALSE) {
694
        // Return nothing so the next task will run in the same request.
695
        \Drupal::state()->delete('install_current_batch');
696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714
        return;
      }
      else {
        // We need to force the page request to end if the task is not
        // complete, since the batch API sometimes prints JSON output
        // rather than returning a themed page.
        $install_state['task_not_complete'] = $install_state['stop_page_request'] = TRUE;
        return $output;
      }
    }
  }

  else {
    // For normal tasks, just return the function result, whatever it is.
    return $function($install_state);
  }
}

/**
715
 * Returns a list of tasks to perform during the current installation request.
716 717 718 719 720 721 722
 *
 * Note that the list of tasks can change based on the installation state as
 * the page request evolves (for example, if an installation profile hasn't
 * been selected yet, we don't yet know which profile tasks need to be run).
 *
 * @param $install_state
 *   An array of information about the current installation state.
723
 *
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745
 * @return
 *   A list of tasks to be performed, with associated metadata.
 */
function install_tasks_to_perform($install_state) {
  // Start with a list of all currently available tasks.
  $tasks = install_tasks($install_state);
  foreach ($tasks as $name => $task) {
    // Remove any tasks that were already performed or that never should run.
    // Also, if we started this page request with an indication of the last
    // task that was completed, skip that task and all those that come before
    // it, unless they are marked as always needing to run.
    if ($task['run'] == INSTALL_TASK_SKIP || in_array($name, $install_state['tasks_performed']) || (!empty($install_state['completed_task']) && empty($completed_task_found) && $task['run'] != INSTALL_TASK_RUN_IF_REACHED)) {
      unset($tasks[$name]);
    }
    if (!empty($install_state['completed_task']) && $name == $install_state['completed_task']) {
      $completed_task_found = TRUE;
    }
  }
  return $tasks;
}

/**
746
 * Returns a list of all tasks the installer currently knows about.
747 748 749 750 751 752 753 754 755
 *
 * This function will return tasks regardless of whether or not they are
 * intended to run on the current page request. However, the list can change
 * based on the installation state (for example, if an installation profile
 * hasn't been selected yet, we don't yet know which profile tasks will be
 * available).
 *
 * @param $install_state
 *   An array of information about the current installation state.
756
 *
757 758 759 760
 * @return
 *   A list of tasks, with associated metadata.
 */
function install_tasks($install_state) {
761 762 763
  // Determine whether a translation file must be imported during the
  // 'install_import_translations' task. Import when a non-English language is
  // available and selected.
764
  $needs_translations = count($install_state['translations']) > 1 && !empty($install_state['parameters']['langcode']) && $install_state['parameters']['langcode'] != 'en';
765 766 767 768
  // Determine whether a translation file must be downloaded during the
  // 'install_download_translation' task. Download when a non-English language
  // is selected, but no translation is yet in the translations directory.
  $needs_download = isset($install_state['parameters']['langcode']) && !isset($install_state['translations'][$install_state['parameters']['langcode']]) && $install_state['parameters']['langcode'] != 'en';
769

770
  // Start with the core installation tasks that run before handing control
771
  // to the installation profile.
772
  $tasks = array(
773
    'install_select_language' => array(
774
      'display_name' => t('Choose language'),
775 776
      'run' => INSTALL_TASK_RUN_IF_REACHED,
    ),
777 778 779
    'install_download_translation' => array(
      'run' => $needs_download ? INSTALL_TASK_RUN_IF_REACHED : INSTALL_TASK_SKIP,
    ),
780
    'install_select_profile' => array(
781
      'display_name' => t('Choose profile'),
782 783 784 785 786 787 788
      'display' => count($install_state['profiles']) != 1,
      'run' => INSTALL_TASK_RUN_IF_REACHED,
    ),
    'install_load_profile' => array(
      'run' => INSTALL_TASK_RUN_IF_REACHED,
    ),
    'install_verify_requirements' => array(
789
      'display_name' => t('Verify requirements'),
790 791
    ),
    'install_settings_form' => array(
792
      'display_name' => t('Set up database'),
793
      'type' => 'form',
794 795 796
      // Even though the form only allows the user to enter database settings,
      // we still need to display it if settings.php is invalid in any way,
      // since the form submit handler is where settings.php is rewritten.
797 798
      'run' => $install_state['settings_verified'] ? INSTALL_TASK_SKIP : INSTALL_TASK_RUN_IF_NOT_COMPLETED,
    ),
799
    'install_base_system' => array(
800
      'run' => $install_state['base_system_verified'] ? INSTALL_TASK_SKIP : INSTALL_TASK_RUN_IF_NOT_COMPLETED,
801
    ),
802
    // All tasks below are executed in a regular, full Drupal environment.
803 804 805 806
    'install_bootstrap_full' => array(
      'run' => INSTALL_TASK_RUN_IF_REACHED,
    ),
    'install_profile_modules' => array(
807
      'display_name' => count($install_state['profiles']) == 1 ? t('Install site') : t('Installation profile'),
808 809
      'type' => 'batch',
    ),
810
    'install_import_translations' => array(
811
      'display_name' => t('Set up translations'),
812 813 814 815 816
      'display' => $needs_translations,
      'type' => 'batch',
      'run' => $needs_translations ? INSTALL_TASK_RUN_IF_NOT_COMPLETED : INSTALL_TASK_SKIP,
    ),
    'install_configure_form' => array(
817
      'display_name' => t('Configure site'),
818 819 820 821 822 823
      'type' => 'form',
    ),
  );

  // Now add any tasks defined by the installation profile.
  if (!empty($install_state['parameters']['profile'])) {
824 825
    // Load the profile install file, because it is not always loaded when
    // hook_install_tasks() is invoked (e.g. batch processing).
826 827
    $profile = $install_state['parameters']['profile'];
    $profile_install_file = dirname($install_state['profiles'][$profile]->uri) . '/' . $profile . '.install';
828
    if (file_exists($profile_install_file)) {
829
      include_once DRUPAL_ROOT . '/' . $profile_install_file;
830
    }
831 832 833 834 835 836 837 838 839 840 841
    $function = $install_state['parameters']['profile'] . '_install_tasks';
    if (function_exists($function)) {
      $result = $function($install_state);
      if (is_array($result)) {
        $tasks += $result;
      }
    }
  }

  // Finish by adding the remaining core tasks.
  $tasks += array(
842
    'install_import_translations_remaining' => array(
843
      'display_name' => t('Finish translations'),
844 845 846 847
      'display' => $needs_translations,
      'type' => 'batch',
      'run' => $needs_translations ? INSTALL_TASK_RUN_IF_NOT_COMPLETED : INSTALL_TASK_SKIP,
    ),
848
    'install_update_configuration_translations' => array(
849
      'display_name' => t('Translate configuration'),
850 851 852 853
      'display' => $needs_translations,
      'type' => 'batch',
      'run' => $needs_translations ? INSTALL_TASK_RUN_IF_NOT_COMPLETED : INSTALL_TASK_SKIP,
    ),
854
    'install_finished' => array(
855
      'display_name' => t('Finished'),
856 857 858 859 860
    ),
  );

  // Allow the installation profile to modify the full list of tasks.
  if (!empty($install_state['parameters']['profile'])) {
861 862
    $profile = $install_state['parameters']['profile'];
    $profile_file = $install_state['profiles'][$profile]->uri;
863
    if (file_exists($profile_file)) {
864
      include_once DRUPAL_ROOT . '/' .  $profile_file;
865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885
      $function = $install_state['parameters']['profile'] . '_install_tasks_alter';
      if (function_exists($function)) {
        $function($tasks, $install_state);
      }
    }
  }

  // Fill in default parameters for each task before returning the list.
  foreach ($tasks as $task_name => &$task) {
    $task += array(
      'display_name' => NULL,
      'display' => !empty($task['display_name']),
      'type' => 'normal',
      'run' => INSTALL_TASK_RUN_IF_NOT_COMPLETED,
      'function' => $task_name,
    );
  }
  return $tasks;
}

/**
886
 * Returns a list of tasks that should be displayed to the end user.
887 888 889 890 891 892
 *
 * The output of this function is a list suitable for sending to
 * theme_task_list().
 *
 * @param $install_state
 *   An array of information about the current installation state.
893
 *
894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910
 * @return
 *   A list of tasks, with keys equal to the machine-readable task name and
 *   values equal to the name that should be displayed.
 *
 * @see theme_task_list()
 */
function install_tasks_to_display($install_state) {
  $displayed_tasks = array();
  foreach (install_tasks($install_state) as $name => $task) {
    if ($task['display']) {
      $displayed_tasks[$name] = $task['display_name'];
    }
  }
  return $displayed_tasks;
}

/**
911
 * Returns the URL that should be redirected to during an installation request.
912 913 914 915 916
 *
 * The output of this function is suitable for sending to install_goto().
 *
 * @param $install_state
 *   An array of information about the current installation state.
917
 *
918 919 920 921 922 923
 * @return
 *   The URL to redirect to.
 *
 * @see install_full_redirect_url()
 */
function install_redirect_url($install_state) {
924
  return 'core/install.php?' . drupal_http_build_query($install_state['parameters']);
925 926 927
}

/**
928
 * Returns the complete URL redirected to during an installation request.
929 930 931
 *
 * @param $install_state
 *   An array of information about the current installation state.
932
 *
933 934 935 936 937 938 939 940 941 942 943
 * @return
 *   The complete URL to redirect to.
 *
 * @see install_redirect_url()
 */
function install_full_redirect_url($install_state) {
  global $base_url;
  return $base_url . '/' . install_redirect_url($install_state);
}

/**
944
 * Displays themed installer output and ends the page request.
945 946 947 948 949 950 951 952 953 954 955
 *
 * Installation tasks should use drupal_set_title() to set the desired page
 * title, but otherwise this function takes care of theming the overall page
 * output during every step of the installation.
 *
 * @param $output
 *   The content to display on the main part of the page.
 * @param $install_state
 *   An array of information about the current installation state.
 */
function install_display_output($output, $install_state) {
956 957 958 959 960
  // Ensure the maintenance theme is initialized.
  // The regular initialization call in install_begin_request() may not be
  // reached in case of an early installer error.
  drupal_maintenance_theme();

961
  drupal_page_header();
962 963 964 965 966 967 968 969 970 971 972 973 974 975 976

  // Prevent install.php from being indexed when installed in a sub folder.
  // robots.txt rules are not read if the site is within domain.com/subfolder
  // resulting in /subfolder/install.php being found through search engines.
  // When settings.php is writeable this can be used via an external database
  // leading a malicious user to gain php access to the server.
  $noindex_meta_tag = array(
    '#tag' => 'meta',
    '#attributes' => array(
      'name' => 'robots',
      'content' => 'noindex, nofollow',
    ),
  );
  drupal_add_html_head($noindex_meta_tag, 'install_meta_robots');

977 978 979 980 981 982 983
  // Only show the task list if there is an active task; otherwise, the page
  // request has ended before tasks have even been started, so there is nothing
  // meaningful to show.
  if (isset($install_state['active_task'])) {
    // Let the theming function know when every step of the installation has
    // been completed.
    $active_task = $install_state['installation_finished'] ? NULL : $install_state['active_task'];
984 985 986 987 988 989 990
    $task_list = array(
      '#theme' => 'task_list',
      '#items' => install_tasks_to_display($install_state),
      '#active' => $active_task,
      '#variant' => 'install',
    );
    drupal_add_region_content('sidebar_first', drupal_render($task_list));
991
  }
992 993
  $install_page = array('#theme' => 'install_page', '#content' => $output);
  print drupal_render($install_page);
994 995 996 997
  exit;
}

/**
998
 * Verifies the requirements for installing Drupal.
999 1000 1001
 *
 * @param $install_state
 *   An array of information about the current installation state.
1002
 *
1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
 * @return
 *   A themed status report, or an exception if there are requirement errors.
 */
function install_verify_requirements(&$install_state) {
  // Check the installation requirements for Drupal and this profile.
  $requirements = install_check_requirements($install_state);

  // Verify existence of all required modules.
  $requirements += drupal_verify_profile($install_state);

1013
  return install_display_requirements($install_state, $requirements);
1014 1015 1016
}

/**
1017
 * Installation task; install the base functionality Drupal needs to bootstrap.
1018 1019 1020 1021
 *
 * @param $install_state
 *   An array of information about the current installation state.
 */
1022
function install_base_system(&$install_state) {
1023
  // Install system.module.
1024
  drupal_install_system($install_state);
1025

1026 1027 1028 1029 1030 1031 1032 1033 1034
  // Call file_ensure_htaccess() to ensure that all of Drupal's standard
  // directories (e.g., the public files directory and config directory) have
  // appropriate .htaccess files. These directories will have already been
  // created by this point in the installer, since Drupal creates them during
  // the install_verify_requirements() task. Note that we cannot call
  // file_ensure_access() any earlier than this, since it relies on
  // system.module in order to work.
  file_ensure_htaccess();

1035 1036
  // Enable the user module so that sessions can be recorded during the
  // upcoming bootstrap step.
1037
  \Drupal::moduleHandler()->install(array('user'), FALSE);
1038

1039
  // Save the list of other modules to install for the upcoming tasks.
1040
  // State can be set to the database now that system.module is installed.
1041 1042
  $modules = $install_state['profile_info']['dependencies'];

1043
  // The installation profile is also a module, which needs to be installed
1044 1045 1046
  // after all the dependencies have been installed.
  $modules[] = drupal_get_profile();

1047
  \Drupal::state()->set('install_profile_modules', array_diff($modules, array('system')));
1048
  $install_state['base_system_verified'] = TRUE;
1049 1050 1051
}

/**
1052
 * Verifies and returns the last installation task that was completed.
1053 1054 1055 1056 1057 1058
 *
 * @return
 *   The last completed task, if there is one. An exception is thrown if Drupal
 *   is already installed.
 */
function install_verify_completed_task() {
1059
  try {
1060
    $task = \Drupal::state()->get('install_task');
1061 1062 1063 1064 1065 1066
  }
  // Do not trigger an error if the database query fails, since the database
  // might not be set up yet.
  catch (Exception $e) {
  }
  if (isset($task)) {
1067 1068 1069 1070 1071 1072 1073 1074
    if ($task == 'done') {
      throw new Exception(install_already_done_error());
    }
    return $task;
  }
}

/**
1075
 * Verifies that settings.php specifies a valid database connection.
1076
 */
1077
function install_verify_database_settings() {
1078 1079 1080
  global $databases;
  if (!empty($databases)) {
    $database = $databases['default']['default'];
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
    $settings_file = './' . conf_path(FALSE) . '/settings.php';
    $errors = install_database_errors($database, $settings_file);
    if (empty($errors)) {
      return TRUE;
    }
  }
  return FALSE;
}

/**
1091
 * Form constructor for a form to configure and rewrite settings.php.
1092 1093 1094
 *
 * @param $install_state
 *   An array of information about the current installation state.
1095
 *
1096 1097
 * @see install_settings_form_validate()
 * @see install_settings_form_submit()
1098
 * @ingroup forms
1099 1100
 */
function install_settings_form($form, &$form_state, &$install_state) {
1101 1102
  global $databases;

1103 1104 1105
  $conf_path = './' . conf_path(FALSE);
  $settings_file = $conf_path . '/settings.php';

1106
  drupal_set_title(t('Database configuration'));
1107

1108
  $drivers = drupal_get_database_types();
1109
  $drivers_keys = array_keys($drivers);
1110

1111 1112
  // If database connection settings have been prepared in settings.php already,
  // then the existing values need to be taken over.
1113 1114 1115
  // Note: The installer even executes this form if there is a valid database
  // connection already, since the submit handler of this form is responsible
  // for writing all $settings to settings.php (not limited to $databases).
1116 1117 1118
  if (isset($databases['default']['default'])) {
    $default_driver = $databases['default']['default']['driver'];
    $default_options = $databases['default']['default'];
1119
  }
1120 1121 1122 1123
  // Otherwise, use the database connection settings from the form input.
  // For a non-interactive installation, this is derived from the original
  // $settings array passed into install_drupal().
  elseif (isset($form_state['input']['driver'])) {
1124 1125 1126
    $default_driver = $form_state['input']['driver'];
    $default_options = $form_state['input'][$default_driver];
  }
1127 1128 1129
  // If there is no database information at all yet, just suggest the first
  // available driver as default value, so that its settings form is made
  // visible via #states when JavaScript is enabled (see below).
1130 1131 1132 1133 1134
  else {
    $default_driver = current($drivers_keys);
    $default_options = array();
  }

1135 1136
  $form['driver'] = array(
    '#type' => 'radios',
1137
    '#title' => t('Database type'),
1138
    '#required' => TRUE,
1139
    '#default_value' => $default_driver,
1140 1141 1142
  );
  if (count($drivers) == 1) {
    $form['driver']['#disabled'] = TRUE;
1143 1144
  }

1145 1146 1147 1148
  // Add driver specific configuration options.
  foreach ($drivers as $key => $driver) {
    $form['driver']['#options'][$key] = $driver->name();

1149
    $form['settings'][$key] = $driver->getFormOptions($default_options);
1150
    $form['settings'][$key]['#prefix'] = '<h2 class="js-hide">' . t('@driver_name settings', array('@driver_name' => $driver->name())) . '</h2>';
1151 1152 1153 1154 1155 1156 1157 1158 1159
    $form['settings'][$key]['#type'] = 'container';
    $form['settings'][$key]['#tree'] = TRUE;
    $form['settings'][$key]['advanced_options']['#parents'] = array($key);
    $form['settings'][$key]['#states'] = array(
      'visible' => array(
        ':input[name=driver]' => array('value' => $key),
      )
    );
  }
1160

1161
  $form['actions'] = array('#type' => 'actions');
1162 1163
  $form['actions']['save'] = array(
    '#type' => 'submit',
1164
    '#value' => t('Save and continue'),
1165
    '#button_type' => 'primary',
1166 1167
    '#limit_validation_errors' => array(
      array('driver'),
1168
      array($default_driver),
1169 1170
    ),
    '#submit' => array('install_settings_form_submit'),
1171 1172 1173 1174
  );

  $form['errors'] = array();
  $form['settings_file'] = array('#type' => 'value', '#value' => $settings_file);
1175 1176 1177 1178 1179

  return $form;
}

/**
1180 1181 1182
 * Form validation handler for install_settings_form().
 *
 * @see install_settings_form_submit()
1183 1184
 */
function install_settings_form_validate($form, &$form_state) {
1185 1186
  $driver = $form_state['values']['driver'];
  $database = $form_state['values'][$driver];
1187 1188 1189 1190 1191
  $drivers = drupal_get_database_types();
  $reflection = new \ReflectionClass($drivers[$driver]);
  $install_namespace = $reflection->getNamespaceName();
  // Cut the trailing \Install from namespace.
  $database['namespace'] = substr($install_namespace, 0, strrpos($install_namespace, '\\'));
1192 1193 1194 1195
  $database['driver'] = $driver;

  $form_state['storage']['database'] = $database;
  $errors = install_database_errors($database, $form_state['values']['settings_file']);
1196
  foreach ($errors as $name => $message) {
1197
    form_set_error($name, $form_state, $message);
1198 1199 1200 1201
  }
}

/**
1202
 * Checks a database connection and returns any errors.
1203 1204
 */
function install_database_errors($database, $settings_file) {
1205
  global $databases;
1206 1207
  $errors = array();

1208
  // Check database type.
1209
  $database_types = drupal_get_database_types();
1210 1211
  $driver = $database['driver'];
  if (!isset($database_types[$driver])) {
1212
    $errors['driver'] = t("In your %settings_file file you have configured @drupal to use a %driver server, however your PHP installation currently does not support this database type.", array('%settings_file' => $settings_file, '@drupal' => drupal_install_profile_distribution_name(), '%driver' => $driver));
1213 1214
  }
  else {
1215 1216
    // Run driver specific validation
    $errors += $database_types[$driver]->validateDatabaseSettings($database);
1217

1218
    // Run tasks associated with the database type. Any errors are caught in the
1219
    // calling function.
1220 1221 1222 1223 1224 1225 1226 1227 1228
    $databases['default']['default'] = $database;
    // Just changing the global doesn't get the new information processed.
    // We need to close any active connections and tell the Database class to
    // re-parse $databases.
    if (Database::isActiveConnection()) {
      Database::closeConnection();
    }
    Database::parseConnectionInfo();

1229
    try {
1230
      db_run_tasks($driver);
1231
    }
1232
    catch (TaskException $e) {
1233 1234 1235
      // These are generic errors, so we do not have any specific key of the
      // database connection array to attach them to; therefore, we just put
      // them in the error array with standard numeric keys.
1236
      $errors[$driver . '][0'] = $e->getMessage();
1237 1238 1239 1240 1241 1242
    }
  }
  return $errors;
}

/**
1243 1244 1245
 * Form submission handler for install_settings_form().
 *
 * @see install_settings_form_validate()
1246 1247
 */
function install_settings_form_submit($form, &$form_state) {
1248
  global $install_state;
1249

1250
  // Update global settings array and save.
1251 1252
  $settings = array();
  $database = $form_state['storage']['database'];
1253 1254 1255 1256
  $settings['databases']['default']['default'] = (object) array(
    'value'    => $database,
    'required' => TRUE,
  );
1257
  $settings['settings']['hash_salt'] = (object) array(
1258
    'value'    => Crypt::randomBytesBase64(55),
1259 1260
    'required' => TRUE,
  );
1261
  // Remember the profile which was used.