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<?php

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 /**
 * @file
 * API functions for installing modules and themes.
 */

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use Symfony\Component\HttpFoundation\RedirectResponse;
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use Drupal\Component\Utility\Crypt;
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use Drupal\Core\Database\Database;
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use Drupal\Core\DrupalKernel;
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/**
 * Requirement severity -- Informational message only.
 */
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const REQUIREMENT_INFO = -1;
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/**
 * Requirement severity -- Requirement successfully met.
 */
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const REQUIREMENT_OK = 0;
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/**
 * Requirement severity -- Warning condition; proceed but flag warning.
 */
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const REQUIREMENT_WARNING = 1;
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/**
 * Requirement severity -- Error condition; abort installation.
 */
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const REQUIREMENT_ERROR = 2;
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/**
 * File permission check -- File exists.
 */
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const FILE_EXIST = 1;
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/**
 * File permission check -- File is readable.
 */
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const FILE_READABLE = 2;
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/**
 * File permission check -- File is writable.
 */
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const FILE_WRITABLE = 4;
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/**
 * File permission check -- File is executable.
 */
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const FILE_EXECUTABLE = 8;
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/**
 * File permission check -- File does not exist.
 */
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const FILE_NOT_EXIST = 16;
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/**
 * File permission check -- File is not readable.
 */
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const FILE_NOT_READABLE = 32;
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/**
 * File permission check -- File is not writable.
 */
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const FILE_NOT_WRITABLE = 64;
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/**
 * File permission check -- File is not executable.
 */
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const FILE_NOT_EXECUTABLE = 128;
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/**
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 * Loads .install files for installed modules to initialize the update system.
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 */
function drupal_load_updates() {
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  foreach (drupal_get_installed_schema_version(NULL, FALSE, TRUE) as $module => $schema_version) {
    if ($schema_version > -1) {
      module_load_install($module);
    }
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  }
}

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/**
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 * Loads the installation profile, extracting its defined distribution name.
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 *
 * @return
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 *   The distribution name defined in the profile's .info.yml file. Defaults to
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 *   "Drupal" if none is explicitly provided by the installation profile.
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 *
 * @see install_profile_info()
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 */
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function drupal_install_profile_distribution_name() {
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  // During installation, the profile information is stored in the global
  // installation state (it might not be saved anywhere yet).
  if (drupal_installation_attempted()) {
    global $install_state;
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    return isset($install_state['profile_info']['distribution_name']) ? $install_state['profile_info']['distribution_name'] : 'Drupal';
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  }
  // At all other times, we load the profile via standard methods.
  else {
    $profile = drupal_get_profile();
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    $info = system_get_info('module', $profile);
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    return $info['distribution_name'];
  }
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}

/**
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 * Detects all supported databases that are compiled into PHP.
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 *
 * @return
 *  An array of database types compiled into PHP.
 */
function drupal_detect_database_types() {
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  $databases = drupal_get_database_types();

  foreach ($databases as $driver => $installer) {
    $databases[$driver] = $installer->name();
  }

  return $databases;
}

/**
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 * Returns all supported database installer objects that are compiled into PHP.
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 *
 * @return
 *  An array of database installer objects compiled into PHP.
 */
function drupal_get_database_types() {
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  $databases = array();
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  $drivers = array();
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  // We define a driver as a directory in /core/includes/database that in turn
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  // contains a database.inc file. That allows us to drop in additional drivers
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  // without modifying the installer.
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  require_once __DIR__ . '/database.inc';
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  // Allow any valid PHP identifier.
  // @see http://www.php.net/manual/en/language.variables.basics.php.
  $mask = '/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/';
  $files = file_scan_directory(DRUPAL_ROOT . '/core/lib/Drupal/Core/Database/Driver', $mask, array('recurse' => FALSE));
  if (is_dir(DRUPAL_ROOT . '/drivers/lib/Drupal/Driver/Database')) {
    $files += file_scan_directory(DRUPAL_ROOT . '/drivers/lib/Drupal/Driver/Database/', $mask, array('recurse' => FALSE));
  }
  foreach ($files as $file) {
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    if (file_exists($file->uri . '/Install/Tasks.php')) {
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      $drivers[$file->filename] = $file->uri;
    }
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  }
  foreach ($drivers as $driver => $file) {
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    $installer = db_installer_object($driver);
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    if ($installer->installable()) {
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      $databases[$driver] = $installer;
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    }
  }
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  // Usability: unconditionally put the MySQL driver on top.
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  if (isset($databases['mysql'])) {
    $mysql_database = $databases['mysql'];
    unset($databases['mysql']);
    $databases = array('mysql' => $mysql_database) + $databases;
  }
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  return $databases;
}

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/**
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 * Replaces values in settings.php with values in the submitted array.
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 *
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 * This function replaces values in place if possible, even for
 * multidimensional arrays. This way the old settings do not linger,
 * overridden and also the doxygen on a value remains where it should be.
 *
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 * @param $settings
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 *   An array of settings that need to be updated. Multidimensional arrays
 *   are dumped up to a stdClass object. The object can have value, required
 *   and comment properties.
 *   @code
 *   $settings['config_directories'] = array(
 *     CONFIG_ACTIVE_DIRECTORY => array(
 *       'path' => (object) array(
 *         'value' => 'config__hash/active'
 *         'required' => TRUE,
 *       ),
 *     ),
 *     CONFIG_STAGING_DIRECTORY => array(
 *       'path' => (object) array(
 *         'value' => 'config_hash/staging',
 *         'required' => TRUE,
 *       ),
 *     ),
 *   );
 *   @endcode
 *   gets dumped as:
 *   @code
 *   $config_directories['active']['path'] = 'config__hash/active';
 *   $config_directories['staging']['path'] = 'config__hash/staging'
 *   @endcode
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 */
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function drupal_rewrite_settings($settings = array(), $settings_file = NULL) {
  if (!isset($settings_file)) {
    $settings_file = conf_path(FALSE) . '/settings.php';
  }
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  // Build list of setting names and insert the values into the global namespace.
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  $variable_names = array();
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  foreach ($settings as $setting => $data) {
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    _drupal_rewrite_settings_global($GLOBALS[$setting], $data);
    $variable_names['$'. $setting] = $setting;
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  }
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  $contents = file_get_contents(DRUPAL_ROOT . '/' . $settings_file);
  if ($contents !== FALSE) {
    // Step through each token in settings.php and replace any variables that
    // are in the passed-in array.
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    $buffer = '';
    $state = 'default';
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    foreach (token_get_all($contents) as $token) {
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      if (is_array($token)) {
        list($type, $value) = $token;
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      }
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      else {
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        $type = -1;
        $value = $token;
      }
      // Do not operate on whitespace.
      if (!in_array($type, array(T_WHITESPACE, T_COMMENT, T_DOC_COMMENT))) {
        switch ($state) {
          case 'default':
            if ($type === T_VARIABLE && isset($variable_names[$value])) {
              // This will be necessary to unset the dumped variable.
              $parent = &$settings;
              // This is the current index in parent.
              $index = $variable_names[$value];
              // This will be necessary for descending into the array.
              $current = &$parent[$index];
              $state = 'candidate_left';
            }
            break;
          case 'candidate_left':
            if ($value == '[') {
              $state = 'array_index';
            }
            if ($value == '=') {
              $state = 'candidate_right';
            }
            break;
          case 'array_index':
            if (_drupal_rewrite_settings_is_array_index($type, $value)) {
              $index = trim($value, '\'"');
              $state = 'right_bracket';
            }
            else {
              // $a[foo()] or $a[$bar] or something like that.
              throw new Exception('invalid array index');
            }
            break;
          case 'right_bracket':
            if ($value == ']') {
              if (isset($current[$index])) {
                // If the new settings has this index, descend into it.
                $parent = &$current;
                $current = &$parent[$index];
                $state = 'candidate_left';
              }
              else {
                // Otherwise, jump back to the default state.
                $state = 'wait_for_semicolon';
              }
            }
            else {
              // $a[1 + 2].
              throw new Exception('] expected');
            }
            break;
          case 'candidate_right':
            if (_drupal_rewrite_settings_is_simple($type, $value)) {
              $value = _drupal_rewrite_settings_dump_one($current);
              // Unsetting $current would not affect $settings at all.
              unset($parent[$index]);
              // Skip the semicolon because _drupal_rewrite_settings_dump_one() added one.
              $state = 'semicolon_skip';
            }
            else {
              $state = 'wait_for_semicolon';
            }
            break;
          case 'wait_for_semicolon':
            if ($value == ';') {
              $state = 'default';
            }
            break;
          case 'semicolon_skip':
            if ($value == ';') {
              $value = '';
              $state = 'default';
            }
            else {
              // If the expression was $a = 1 + 2; then we replaced 1 and
              // the + is unexpected.
              throw new Exception('Unepxected token after replacing value.');
            }
            break;
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        }
      }
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      $buffer .= $value;
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    }
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    foreach ($settings as $name => $setting) {
      $buffer .= _drupal_rewrite_settings_dump($setting, '$' . $name);
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    }

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    // Write the new settings file.
    if (file_put_contents(DRUPAL_ROOT . '/' . $settings_file, $buffer) === FALSE) {
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      throw new Exception(t('Failed to modify %settings. Verify the file permissions.', array('%settings' => $settings_file)));
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    }
  }
  else {
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    throw new Exception(t('Failed to open %settings. Verify the file permissions.', array('%settings' => $settings_file)));
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  }
}

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/**
 * Helper for drupal_rewrite_settings().
 *
 * Checks whether this token represents a scalar or NULL.
 *
 * @param int $type
 *   The token type
 *   @see token_name().
 * @param string $value
 *   The value of the token.
 *
 * @return bool
 *   TRUE if this token represents a scalar or NULL.
 */
function _drupal_rewrite_settings_is_simple($type, $value) {
  $is_integer = $type == T_LNUMBER;
  $is_float = $type == T_DNUMBER;
  $is_string = $type == T_CONSTANT_ENCAPSED_STRING;
  $is_boolean_or_null = $type == T_STRING && in_array(strtoupper($value), array('TRUE', 'FALSE', 'NULL'));
  return $is_integer || $is_float || $is_string || $is_boolean_or_null;
}


/**
 * Helper for drupal_rewrite_settings().
 *
 * Checks whether this token represents a valid array index: a number or a
 * stirng.
 *
 * @param int $type
 *   The token type
 *   @see token_name().
 *
 * @return bool
 *   TRUE if this token represents a number or a string.
 */
function _drupal_rewrite_settings_is_array_index($type) {
  $is_integer = $type == T_LNUMBER;
  $is_float = $type == T_DNUMBER;
  $is_string = $type == T_CONSTANT_ENCAPSED_STRING;
  return $is_integer || $is_float || $is_string;
}

/**
 * Helper for drupal_rewrite_settings().
 *
 * Makes the new settings global.
 *
 * @param array|NULL $ref
 *   A reference to a nested index in $GLOBALS.
 * @param array|object $variable
 *   The nested value of the setting being copied.
 */
function _drupal_rewrite_settings_global(&$ref, $variable) {
  if (is_object($variable)) {
    $ref = $variable->value;
  }
  else {
    foreach ($variable as $k => $v) {
      _drupal_rewrite_settings_global($ref[$k], $v);
    }
  }
}

/**
 * Helper for drupal_rewrite_settings().
 *
 * Dump the relevant value properties.
 *
 * @param array|object $variable
 *   The container for variable values.
 * @param string $variable_name
 *   Name of variable.
 * @return string
 *   A string containing valid PHP code of the variable suitable for placing
 *   into settings.php.
 */
function _drupal_rewrite_settings_dump($variable, $variable_name) {
  $return = '';
  if (is_object($variable)) {
    if (!empty($variable->required)) {
      $return .= _drupal_rewrite_settings_dump_one($variable, "$variable_name = ", "\n");
    }
  }
  else {
    foreach ($variable as $k => $v) {
      $return .= _drupal_rewrite_settings_dump($v, $variable_name . "['" . $k . "']");
    }
  }
  return $return;
}


/**
 * Helper for drupal_rewrite_settings().
 *
 * Dump the value of a value property and adds the comment if it exists.
 *
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 * @param object $variable
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 *   A stdClass object with at least a value property.
 * @param string $prefix
 *   A string to prepend to the variable's value.
 * @param string $suffix
 *   A string to append to the variable's value.
 * @return string
 *   A string containing valid PHP code of the variable suitable for placing
 *   into settings.php.
 */
function _drupal_rewrite_settings_dump_one(\stdClass $variable, $prefix = '', $suffix = '') {
  $return = $prefix . var_export($variable->value, TRUE) . ';';
  if (!empty($variable->comment)) {
    $return .= ' // ' . $variable->comment;
  }
  $return .= $suffix;
  return $return;
}

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/**
 * Creates the config directory and ensures it is operational.
 *
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 * @param int $mode
 *   Octal value for the permissions. Consult PHP chmod() documentation for
 *   more information.
 *
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 * @see install_settings_form_submit()
 * @see update_prepare_d8_bootstrap()
 */
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function drupal_install_config_directories($mode = NULL) {
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  global $config_directories;
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  // Add a randomized config directory name to settings.php, unless it was
  // manually defined in the existing already.
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  if (empty($config_directories)) {
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    $config_directories_hash = Crypt::randomStringHashed(55);
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    $settings['config_directories'] = array(
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      CONFIG_ACTIVE_DIRECTORY => array(
        'path' => (object) array(
          'value' => 'config_' . $config_directories_hash . '/active',
          'required' => TRUE,
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        ),
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      ),
      CONFIG_STAGING_DIRECTORY => array(
        'path' => (object) array(
          'value' => 'config_' . $config_directories_hash . '/staging',
          'required' => TRUE,
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        ),
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      ),
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    );
    // Rewrite settings.php, which also sets the value as global variable.
    drupal_rewrite_settings($settings);
  }

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  // Ensure the config directories exist or can be created, and are writable.
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  foreach (array(CONFIG_ACTIVE_DIRECTORY, CONFIG_STAGING_DIRECTORY) as $config_type) {
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    // This should never fail, since if the config directory was specified in
    // settings.php it will have already been created and verified earlier, and
    // if it wasn't specified in settings.php, it is created here inside the
    // public files directory, which has already been verified to be writable
    // itself. But if it somehow fails anyway, the installation cannot proceed.
    // Bail out using a similar error message as in system_requirements().
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    if (!install_ensure_config_directory($config_type, $mode)) {
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      throw new Exception(t('The directory %directory could not be created or could not be made writable. To proceed with the installation, either create the directory and modify its permissions manually or ensure that the installer has the permissions to create it automatically. For more information, see the <a href="@handbook_url">online handbook</a>.', array(
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        '%directory' => config_get_config_directory($config_type),
        '@handbook_url' => 'http://drupal.org/server-permissions',
      )));
    }
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    // Put a README.txt into each config directory. This is required so that
    // they can later be added to git. Since these directories are auto-
    // created, we have to write out the README rather than just adding it
    // to the drupal core repo.
    switch ($config_type) {
      case CONFIG_ACTIVE_DIRECTORY:
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        $text = 'This directory contains the active configuration for your Drupal site. To move this configuration between environments, contents from this directory should be placed in the staging directory on the target server. To make this configuration active, see admin/config/development/configuration/sync on the target server.';
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        break;
      case CONFIG_STAGING_DIRECTORY:
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        $text = 'This directory contains configuration to be imported into your Drupal site. To make this configuration active, see admin/config/development/configuration/sync.';
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        break;
    }
    $text .=  ' For information about deploying configuration between servers, see http://drupal.org/documentation/administer/config';
    file_put_contents(config_get_config_directory($config_type) . '/README.txt', $text);
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  }
}

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/**
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 * Checks whether a config directory exists and is writable.
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 *
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 * This partially duplicates install_ensure_config_directory(), but is required
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 * since the installer would create the config directory too early in the
 * installation process otherwise (e.g., when only visiting install.php when
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 * there is a settings.php already, but not actually executing the
 * installation).
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 *
 * @param string $type
 *   Type of config directory to return. Drupal core provides 'active' and
 *   'staging'.
 *
 * @return bool
 *   TRUE if the config directory exists and is writable.
 */
function install_verify_config_directory($type) {
  global $config_directories;
  if (!isset($config_directories[$type])) {
    return FALSE;
  }
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  // config_get_config_directory() throws an exception when the passed $type
  // does not exist in $config_directories. This can happen if there is a
  // prepared settings.php that defines $config_directories already.
  try {
    $config_directory = config_get_config_directory($type);
    if (is_dir($config_directory) && is_writable($config_directory)) {
      return TRUE;
    }
  }
  catch (\Exception $e) {
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  }
  return FALSE;
}

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/**
 * Ensures that the config directory exists and is writable, or can be made so.
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 *
 * @param string $type
 *   Type of config directory to return. Drupal core provides 'active' and
 *   'staging'.
 *
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 * @param int $mode
 *   Octal value for the permissions. Consult PHP chmod() documentation for
 *   more information.
 *
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 * @return bool
 *   TRUE if the config directory exists and is writable.
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 */
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function install_ensure_config_directory($type, $mode = NULL) {
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  // The config directory must be defined in settings.php.
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  global $config_directories;
  if (!isset($config_directories[$type])) {
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    return FALSE;
  }
  // The logic here is similar to that used by system_requirements() for other
  // directories that the installer creates.
  else {
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    $config_directory = config_get_config_directory($type);
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    return file_prepare_directory($config_directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS, $mode);
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  }
}

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/**
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 * Verifies that all dependencies are met for a given installation profile.
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 *
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 * @param $install_state
 *   An array of information about the current installation state.
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 *
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 * @return
 *   The list of modules to install.
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 */
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function drupal_verify_profile($install_state) {
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  include_once __DIR__ . '/file.inc';
  include_once __DIR__ . '/common.inc';
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  $profile = $install_state['parameters']['profile'];
  $profile_file = $install_state['profiles'][$profile]->uri;
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  if (!isset($profile) || !file_exists($profile_file)) {
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    throw new Exception(install_no_profile_error());
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  }
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  $info = $install_state['profile_info'];
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  // Get a list of modules that exist in Drupal's assorted subdirectories.
  $present_modules = array();
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  foreach (drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.module$/', 'modules') as $present_module) {
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    $present_modules[] = $present_module->name;
  }

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

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  // Verify that all of the profile's required modules are present.
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  $missing_modules = array_diff($info['dependencies'], $present_modules);
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  $requirements = array();
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  if (count($missing_modules)) {
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    $modules = array();
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    foreach ($missing_modules as $module) {
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      $modules[] = '<span class="admin-missing">' . drupal_ucfirst($module) . '</span>';
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    }
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    $requirements['required_modules'] = array(
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      'title'       => t('Required modules'),
      'value'       => t('Required modules not found.'),
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      'severity'    => REQUIREMENT_ERROR,
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      'description' => t('The following modules are required but were not found. Move them into the appropriate modules subdirectory, such as <em>/modules</em>. Missing modules: !modules', array('!modules' => implode(', ', $modules))),
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    );
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  }
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  return $requirements;
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}
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/**
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 * Installs the system module.
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 *
 * Separated from the installation of other modules so core system
 * functions can be made available while other modules are installed.
 */
function drupal_install_system() {
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  // Create tables.
  drupal_install_schema('system');
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  if (!drupal_container()->has('kernel')) {
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    // Immediately boot a kernel to have real services ready.
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    $kernel = new DrupalKernel('install', drupal_classloader(), FALSE);
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    $kernel->boot();
  }
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  $system_path = drupal_get_path('module', 'system');
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  require_once DRUPAL_ROOT . '/' . $system_path . '/system.install';
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  $system_versions = drupal_get_schema_versions('system');
  $system_version = $system_versions ? max($system_versions) : SCHEMA_INSTALLED;
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  \Drupal::keyValue('system.schema')->set('system', $system_version);
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  // System module needs to be enabled and the system/module lists need to be
  // reset first in order to allow config_install_default_config() to invoke
  // config import callbacks.
  // @todo Installation profiles may override the system.module config object.
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  \Drupal::config('system.module')
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    ->set('enabled.system', 0)
    ->save();

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  // Update the module list to include it.
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  \Drupal::moduleHandler()->setModuleList(array('system' => $system_path . '/system.module'));
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  config_install_default_config('module', 'system');
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  module_invoke('system', 'install');
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}

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/**
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 * Verifies the state of the specified file.
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 *
 * @param $file
 *   The file to check for.
 * @param $mask
 *   An optional bitmask created from various FILE_* constants.
 * @param $type
 *   The type of file. Can be file (default), dir, or link.
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 *
666
 * @return
667
 *   TRUE on success or FALSE on failure. A message is set for the latter.
668 669 670 671 672 673 674 675 676
 */
function drupal_verify_install_file($file, $mask = NULL, $type = 'file') {
  $return = TRUE;
  // Check for files that shouldn't be there.
  if (isset($mask) && ($mask & FILE_NOT_EXIST) && file_exists($file)) {
    return FALSE;
  }
  // Verify that the file is the type of file it is supposed to be.
  if (isset($type) && file_exists($file)) {
677
    $check = 'is_' . $type;
678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736
    if (!function_exists($check) || !$check($file)) {
      $return = FALSE;
    }
  }

  // Verify file permissions.
  if (isset($mask)) {
    $masks = array(FILE_EXIST, FILE_READABLE, FILE_WRITABLE, FILE_EXECUTABLE, FILE_NOT_READABLE, FILE_NOT_WRITABLE, FILE_NOT_EXECUTABLE);
    foreach ($masks as $current_mask) {
      if ($mask & $current_mask) {
        switch ($current_mask) {
          case FILE_EXIST:
            if (!file_exists($file)) {
              if ($type == 'dir') {
                drupal_install_mkdir($file, $mask);
              }
              if (!file_exists($file)) {
                $return = FALSE;
              }
            }
            break;
          case FILE_READABLE:
            if (!is_readable($file) && !drupal_install_fix_file($file, $mask)) {
              $return = FALSE;
            }
            break;
          case FILE_WRITABLE:
            if (!is_writable($file) && !drupal_install_fix_file($file, $mask)) {
              $return = FALSE;
            }
            break;
          case FILE_EXECUTABLE:
            if (!is_executable($file) && !drupal_install_fix_file($file, $mask)) {
              $return = FALSE;
            }
            break;
          case FILE_NOT_READABLE:
            if (is_readable($file) && !drupal_install_fix_file($file, $mask)) {
              $return = FALSE;
            }
            break;
          case FILE_NOT_WRITABLE:
            if (is_writable($file) && !drupal_install_fix_file($file, $mask)) {
              $return = FALSE;
            }
            break;
          case FILE_NOT_EXECUTABLE:
            if (is_executable($file) && !drupal_install_fix_file($file, $mask)) {
              $return = FALSE;
            }
            break;
        }
      }
    }
  }
  return $return;
}

/**
737
 * Creates a directory with the specified permissions.
738
 *
739
 * @param $file
740
 *  The name of the directory to create;
741
 * @param $mask
742 743 744
 *  The permissions of the directory to create.
 * @param $message
 *  (optional) Whether to output messages. Defaults to TRUE.
745
 *
746 747 748 749 750 751 752 753 754 755
 * @return
 *  TRUE/FALSE whether or not the directory was successfully created.
 */
function drupal_install_mkdir($file, $mask, $message = TRUE) {
  $mod = 0;
  $masks = array(FILE_READABLE, FILE_WRITABLE, FILE_EXECUTABLE, FILE_NOT_READABLE, FILE_NOT_WRITABLE, FILE_NOT_EXECUTABLE);
  foreach ($masks as $m) {
    if ($mask & $m) {
      switch ($m) {
        case FILE_READABLE:
756
          $mod |= 0444;
757 758
          break;
        case FILE_WRITABLE:
759
          $mod |= 0222;
760 761
          break;
        case FILE_EXECUTABLE:
762
          $mod |= 0111;
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          break;
      }
    }
  }

768
  if (@drupal_mkdir($file, $mod)) {
769 770 771 772 773 774 775 776
    return TRUE;
  }
  else {
    return FALSE;
  }
}

/**
777
 * Attempts to fix file permissions.
778
 *
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 * The general approach here is that, because we do not know the security
 * setup of the webserver, we apply our permission changes to all three
 * digits of the file permission (i.e. user, group and all).
 *
 * To ensure that the values behave as expected (and numbers don't carry
 * from one digit to the next) we do the calculation on the octal value
 * using bitwise operations. This lets us remove, for example, 0222 from
 * 0700 and get the correct value of 0500.
 *
788 789 790 791 792 793
 * @param $file
 *  The name of the file with permissions to fix.
 * @param $mask
 *  The desired permissions for the file.
 * @param $message
 *  (optional) Whether to output messages. Defaults to TRUE.
794
 *
795 796 797 798
 * @return
 *  TRUE/FALSE whether or not we were able to fix the file's permissions.
 */
function drupal_install_fix_file($file, $mask, $message = TRUE) {
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  // If $file does not exist, fileperms() issues a PHP warning.
  if (!file_exists($file)) {
    return FALSE;
  }

804
  $mod = fileperms($file) & 0777;
805
  $masks = array(FILE_READABLE, FILE_WRITABLE, FILE_EXECUTABLE, FILE_NOT_READABLE, FILE_NOT_WRITABLE, FILE_NOT_EXECUTABLE);
806 807 808 809 810

  // FILE_READABLE, FILE_WRITABLE, and FILE_EXECUTABLE permission strings
  // can theoretically be 0400, 0200, and 0100 respectively, but to be safe
  // we set all three access types in case the administrator intends to
  // change the owner of settings.php after installation.
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  foreach ($masks as $m) {
    if ($mask & $m) {
      switch ($m) {
        case FILE_READABLE:
          if (!is_readable($file)) {
816
            $mod |= 0444;
817 818 819 820
          }
          break;
        case FILE_WRITABLE:
          if (!is_writable($file)) {
821
            $mod |= 0222;
822 823 824 825
          }
          break;
        case FILE_EXECUTABLE:
          if (!is_executable($file)) {
826
            $mod |= 0111;
827 828 829 830
          }
          break;
        case FILE_NOT_READABLE:
          if (is_readable($file)) {
831
            $mod &= ~0444;
832 833 834 835
          }
          break;
        case FILE_NOT_WRITABLE:
          if (is_writable($file)) {
836
            $mod &= ~0222;
837 838 839 840
          }
          break;
        case FILE_NOT_EXECUTABLE:
          if (is_executable($file)) {
841
            $mod &= ~0111;
842 843 844 845 846 847
          }
          break;
      }
    }
  }

848 849 850 851
  // chmod() will work if the web server is running as owner of the file.
  // If PHP safe_mode is enabled the currently executing script must also
  // have the same owner.
  if (@chmod($file, $mod)) {
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    return TRUE;
  }
  else {
    return FALSE;
  }
}

859
/**
860
 * Sends the user to a different installer page.
861 862
 *
 * This issues an on-site HTTP redirect. Messages (and errors) are erased.
863 864 865 866 867
 *
 * @param $path
 *   An installer path.
 */
function install_goto($path) {
868
  global $base_url;
869 870 871 872 873 874
  $headers = array(
    // Not a permanent redirect.
    'Cache-Control' => 'no-cache',
  );
  $response = new RedirectResponse($base_url . '/' . $path, 302, $headers);
  $response->send();
875 876
}

877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938
/**
 * Returns the URL of the current script, with modified query parameters.
 *
 * This function can be called by low-level scripts (such as install.php and
 * update.php) and returns the URL of the current script. Existing query
 * parameters are preserved by default, but new ones can optionally be merged
 * in.
 *
 * This function is used when the script must maintain certain query parameters
 * over multiple page requests in order to work correctly. In such cases (for
 * example, update.php, which requires the 'continue=1' parameter to remain in
 * the URL throughout the update process if there are any requirement warnings
 * that need to be bypassed), using this function to generate the URL for links
 * to the next steps of the script ensures that the links will work correctly.
 *
 * @param $query
 *   (optional) An array of query parameters to merge in to the existing ones.
 *
 * @return
 *   The URL of the current script, with query parameters modified by the
 *   passed-in $query. The URL is not sanitized, so it still needs to be run
 *   through check_url() if it will be used as an HTML attribute value.
 *
 * @see drupal_requirements_url()
 */
function drupal_current_script_url($query = array()) {
  $uri = $_SERVER['SCRIPT_NAME'];
  $query = array_merge(drupal_get_query_parameters(), $query);
  if (!empty($query)) {
    $uri .= '?' . drupal_http_build_query($query);
  }
  return $uri;
}

/**
 * Returns a URL for proceeding to the next page after a requirements problem.
 *
 * This function can be called by low-level scripts (such as install.php and
 * update.php) and returns a URL that can be used to attempt to proceed to the
 * next step of the script.
 *
 * @param $severity
 *   The severity of the requirements problem, as returned by
 *   drupal_requirements_severity().
 *
 * @return
 *   A URL for attempting to proceed to the next step of the script. The URL is
 *   not sanitized, so it still needs to be run through check_url() if it will
 *   be used as an HTML attribute value.
 *
 * @see drupal_current_script_url()
 */
function drupal_requirements_url($severity) {
  $query = array();
  // If there are no errors, only warnings, append 'continue=1' to the URL so
  // the user can bypass this screen on the next page load.
  if ($severity == REQUIREMENT_WARNING) {
    $query['continue'] = 1;
  }
  return drupal_current_script_url($query);
}

939
/**
940
 * Checks an installation profile's requirements.
941
 *
942
 * @param string $profile
943
 *   Name of installation profile to check.
944 945 946 947
 * @param array $install_state
 *   The current state in the install process.
 *
 * @return array
948
 *   Array of the installation profile's requirements.
949
 */
950
function drupal_check_profile($profile, array $install_state) {
951
  include_once __DIR__ . '/file.inc';
952

953
  $profile_file = $install_state['profiles'][$profile]->uri;
954 955

  if (!isset($profile) || !file_exists($profile_file)) {
956
    throw new Exception(install_no_profile_error());
957 958
  }

959
  $info = install_profile_info($profile);
960

961
  // Collect requirement testing results.
962
  $requirements = array();
963 964 965
  foreach ($info['dependencies'] as $module) {
    module_load_install($module);
    $function = $module . '_requirements';
966 967
    if (function_exists($function)) {
      $requirements = array_merge($requirements, $function('install'));
968
    }
969 970 971 972 973
  }
  return $requirements;
}

/**
974
 * Extracts the highest severity from the requirements array.
975 976
 *
 * @param $requirements
977
 *   An array of requirements, in the same format as is returned by
978
 *   hook_requirements().
979
 *
980 981
 * @return
 *   The highest severity in the array.
982 983 984 985 986 987 988 989 990 991 992 993
 */
function drupal_requirements_severity(&$requirements) {
  $severity = REQUIREMENT_OK;
  foreach ($requirements as $requirement) {
    if (isset($requirement['severity'])) {
      $severity = max($severity, $requirement['severity']);
    }
  }
  return $severity;
}

/**
994
 * Checks a module's requirements.
995 996 997
 *
 * @param $module
 *   Machine name of module to check.
998
 *
999
 * @return
1000
 *   TRUE or FALSE, depending on whether the requirements are met.
1001 1002
 */
function drupal_check_module($module) {
1003
  module_load_install($module);
1004 1005 1006 1007 1008 1009 1010 1011 1012
  // Check requirements
  $requirements = module_invoke($module, 'requirements', 'install');
  if (is_array($requirements) && drupal_requirements_severity($requirements) == REQUIREMENT_ERROR) {
    // Print any error messages
    foreach ($requirements as $requirement) {
      if (isset($requirement['severity']) && $requirement['severity'] == REQUIREMENT_ERROR) {
        $message = $requirement['description'];
        if (isset($requirement['value']) && $requirement['value']) {
          $message .= ' (' . t('Currently using !item !version', array('!item' => $requirement['title'], '!version' => $requirement['value'])) . ')';
1013
        }
1014
        drupal_set_message($message, 'error');
1015 1016
      }
    }
1017
    return FALSE;
1018 1019 1020
  }
  return TRUE;
}
1021 1022

/**
1023
 * Retrieves information about an installation profile from its .info.yml file.
1024
 *
1025 1026
 * The information stored in a profile .info.yml file is similar to that stored
 * in a normal Drupal module .info.yml file. For example:
1027
 * - name: The real name of the installation profile for display purposes.
1028
 * - description: A brief description of the profile.
1029 1030
 * - dependencies: An array of shortnames of other modules that this install
 *   profile requires.
1031
 *
1032 1033 1034
 * Additional, less commonly-used information that can appear in a
 * profile.info.yml file but not in a normal Drupal module .info.yml file
 * includes:
1035 1036 1037
 * - distribution_name: The name of the Drupal distribution that is being
 *   installed, to be shown throughout the installation process. Defaults to
 *   'Drupal'.
1038 1039 1040 1041 1042 1043
 * - exclusive: If the install profile is intended to be the only eligible
 *   choice in a distribution, setting exclusive = TRUE will auto-select it
 *   during installation, and the install profile selection screen will be
 *   skipped. If more than one profile is found where exclusive = TRUE then
 *   this property will have no effect and the profile selection screen will
 *   be shown as normal with all available profiles shown.
1044
 *
1045 1046 1047 1048
 * Note that this function does an expensive file system scan to get info file
 * information for dependencies. If you only need information from the info
 * file itself, use system_get_info().
 *
1049
 * Example of .info.yml file:
1050
 * @code
1051 1052
 *    name = Minimal
 *    description = Start fresh, with only a few modules enabled.
1053 1054
 *    dependencies[] = block
 *    dependencies[] = dblog
1055
 * @endcode
1056
 *
1057
 * @param $profile