3 namespace Drupal\Core\Site;
5 use Drupal\Component\Utility\Crypt;
6 use Drupal\Core\Database\Database;
9 * Read only settings that are initialized with the class.
13 final class Settings {
16 * Array with the settings.
20 private $storage = [];
25 * @var \Drupal\Core\Site\Settings
27 private static $instance = NULL;
32 * @param array $settings
33 * Array with the settings.
35 public function __construct(array $settings) {
36 $this->storage = $settings;
37 self::$instance = $this;
41 * Returns the settings instance.
43 * A singleton is used because this class is used before the container is
46 * @return \Drupal\Core\Site\Settings
48 * @throws \BadMethodCallException
49 * Thrown when the settings instance has not been initialized yet.
51 public static function getInstance() {
52 if (self::$instance === NULL) {
53 throw new \BadMethodCallException('Settings::$instance is not initialized yet. Whatever you are trying to do, it might be too early for that. You could call Settings::initialize(), but it is probably better to wait until it is called in the regular way. Also check for recursions.');
55 return self::$instance;
59 * Protects creating with clone.
61 private function __clone() {
65 * Prevents settings from being serialized.
67 public function __sleep() {
68 throw new \LogicException('Settings can not be serialized. This probably means you are serializing an object that has an indirect reference to the Settings object. Adjust your code so that is not necessary.');
74 * Settings can be set in settings.php in the $settings array and requested
75 * by this function. Settings should be used over configuration for read-only,
76 * possibly low bootstrap configuration that is environment specific.
79 * The name of the setting to return.
80 * @param mixed $default
81 * (optional) The default value to use if this setting is not set.
84 * The value of the setting, the provided default if not set.
86 public static function get($name, $default = NULL) {
87 return isset(self::$instance->storage[$name]) ? self::$instance->storage[$name] : $default;
91 * Returns all the settings. This is only used for testing purposes.
96 public static function getAll() {
97 return self::$instance->storage;
101 * Bootstraps settings.php and the Settings singleton.
103 * @param string $app_root
105 * @param string $site_path
106 * The current site path.
107 * @param \Composer\Autoload\ClassLoader $class_loader
108 * The class loader that is used for this request. Passed by reference and
109 * exposed to the local scope of settings.php, so as to allow it to be
110 * decorated with Symfony's ApcClassLoader, for example.
112 * @see default.settings.php
114 public static function initialize($app_root, $site_path, &$class_loader) {
115 // Export these settings.php variables to the global namespace.
116 global $config_directories, $config;
121 if (is_readable($app_root . '/' . $site_path . '/settings.php')) {
122 require $app_root . '/' . $site_path . '/settings.php';
125 // Initialize Database.
126 Database::setMultipleConnectionInfo($databases);
128 // Initialize Settings.
129 new Settings($settings);
133 * Gets a salt useful for hardening against SQL injection.
136 * A salt based on information in settings.php, not in the database.
138 * @throws \RuntimeException
140 public static function getHashSalt() {
141 $hash_salt = self::$instance->get('hash_salt');
142 // This should never happen, as it breaks user logins and many other
143 // services. Therefore, explicitly notify the user (developer) by throwing
145 if (empty($hash_salt)) {
146 throw new \RuntimeException('Missing $settings[\'hash_salt\'] in settings.php.');
153 * Generates a prefix for APCu user cache keys.
155 * A standardized prefix is useful to allow visual inspection of an APCu user
156 * cache. By default, this method will produce a unique prefix per site using
157 * the hash salt. If the setting 'apcu_ensure_unique_prefix' is set to FALSE
158 * then if the caller does not provide a $site_path only the Drupal root will
159 * be used. This allows tests to use the same prefix ensuring that the number
160 * of APCu items created during a full test run is kept to a minimum.
161 * Additionally, if a multi site implementation does not use site specific
162 * module directories setting apcu_ensure_unique_prefix would allow the sites
163 * to share APCu cache items.
166 * An identifier for the prefix. For example, 'class_loader' or
170 * The prefix for APCu user cache keys.
172 * @see https://www.drupal.org/project/drupal/issues/2926309
174 public static function getApcuPrefix($identifier, $root, $site_path = '') {
175 if (static::get('apcu_ensure_unique_prefix', TRUE)) {
176 return 'drupal.' . $identifier . '.' . \Drupal::VERSION . '.' . static::get('deployment_identifier') . '.' . hash_hmac('sha256', $identifier, static::get('hash_salt') . '.' . $root . '/' . $site_path);
178 return 'drupal.' . $identifier . '.' . \Drupal::VERSION . '.' . static::get('deployment_identifier') . '.' . Crypt::hashBase64($root . '/' . $site_path);