Drupal.php

<?php

use Drupal\Core\DependencyInjection\ContainerNotInitializedException;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Static Service Container wrapper.
 *
 * Generally, code in Drupal should accept its dependencies via either
 * constructor injection or setter method injection. However, there are cases,
 * particularly in legacy procedural code, where that is infeasible. This
 * class acts as a unified global accessor to arbitrary services within the
 * system in order to ease the transition from procedural code to injected OO
 * code.
 *
 * The container is built by the kernel and passed in to this class which stores
 * it statically. The container always contains the services from
 * \Drupal\Core\CoreServiceProvider, the service providers of enabled modules and any other
 * service providers defined in $GLOBALS['conf']['container_service_providers'].
 *
 * This class exists only to support legacy code that cannot be dependency
 * injected. If your code needs it, consider refactoring it to be object
 * oriented, if possible. When this is not possible, for instance in the case of
 * hook implementations, and your code is more than a few non-reusable lines, it
 * is recommended to instantiate an object implementing the actual logic.
 *
 * @code
 *   // Legacy procedural code.
 *   function hook_do_stuff() {
 *     $lock = lock()->acquire('stuff_lock');
 *     // ...
 *   }
 *
 *   // Correct procedural code.
 *   function hook_do_stuff() {
 *     $lock = \Drupal::lock()->acquire('stuff_lock');
 *     // ...
 *   }
 *
 *   // The preferred way: dependency injected code.
 *   function hook_do_stuff() {
 *     // Move the actual implementation to a class and instantiate it.
 *     $instance = new StuffDoingClass(\Drupal::lock());
 *     $instance->doStuff();
 *
 *     // Or, even better, rely on the service container to avoid hard coding a
 *     // specific interface implementation, so that the actual logic can be
 *     // swapped. This might not always make sense, but in general it is a good
 *     // practice.
 *     \Drupal::service('stuff.doing')->doStuff();
 *   }
 *
 *   interface StuffDoingInterface {
 *     public function doStuff();
 *   }
 *
 *   class StuffDoingClass implements StuffDoingInterface {
 *     protected $lockBackend;
 *
 *     public function __construct(LockBackendInterface $lock_backend) {
 *       $this->lockBackend = $lock_backend;
 *     }
 *
 *     public function doStuff() {
 *       $lock = $this->lockBackend->acquire('stuff_lock');
 *       // ...
 *     }
 *   }
 * @endcode
 *
 * @see \Drupal\Core\DrupalKernel
 */
class Drupal {
    
    /**
     * The current system version.
     */
    const VERSION = '11.0-dev';
    
    /**
     * Core API compatibility.
     *
     * This constant is set to '8.x' to provide legacy compatibility with
     * extensions that use the '8.x-' prefix to denote Drupal core major version
     * compatibility, for example '8.x-1.0'. These extensions can specify
     * compatibility with multiple major versions of Drupal core by setting the
     * version constraint in 'core_version_requirement'. Drupal does not support
     * using this core major version number prefix with versions greater than 8.
     * For example '9.x-' prefixed extensions are not supported.
     *
     * @todo Remove or rename this constant in https://www.drupal.org/i/3085662
     */
    const CORE_COMPATIBILITY = '8.x';
    
    /**
     * Core minimum schema version.
     */
    const CORE_MINIMUM_SCHEMA_VERSION = 8000;
    
    /**
     * Minimum allowed version of PHP for Drupal to be bootstrapped.
     *
     * Below this version:
     * - The installer cannot be run.
     * - Updates cannot be run.
     * - Modules and themes cannot be enabled.
     * - If a site managed to bypass all of the above, then an error is shown in
     *   the status report and various fatal errors occur on various pages.
     *
     * Note: To prevent the installer from having fatal errors on older versions
     * of PHP, the value of this constant is hardcoded twice in core/install.php:
     * - Once as a parameter of version_compare()
     * - Once in the error message printed to the user immediately after.
     * Remember to update both whenever this constant is updated.
     */
    const MINIMUM_PHP = '8.3.0';
    
    /**
     * Minimum recommended value of PHP memory_limit.
     *
     * 64M was chosen as a minimum requirement in order to allow for additional
     * contributed modules to be installed prior to hitting the limit. However,
     * 40M is the target for the Standard installation profile.
     */
    const MINIMUM_PHP_MEMORY_LIMIT = '64M';
    
    /**
     * Minimum recommended version of PHP.
     *
     * Sites installing Drupal on PHP versions lower than this will see a warning
     * message, but Drupal can still be installed. Used for (e.g.) PHP versions
     * that have reached their EOL or will in the near future.
     */
    const RECOMMENDED_PHP = '8.3.0';
    
    /**
     * The currently active container object, or NULL if not initialized yet.
     *
     * @var \Drupal\Component\DependencyInjection\ContainerInterface|null
     */
    protected static $container;
    
    /**
     * Sets a new global container.
     *
     * @param \Symfony\Component\DependencyInjection\ContainerInterface $container
     *   A new container instance to replace the current.
     */
    public static function setContainer(ContainerInterface $container) {
        static::$container = $container;
    }
    
    /**
     * Unsets the global container.
     */
    public static function unsetContainer() {
        static::$container = NULL;
    }
    
    /**
     * Returns the currently active global container.
     *
     * @return \Drupal\Component\DependencyInjection\ContainerInterface
     *
     * @throws \Drupal\Core\DependencyInjection\ContainerNotInitializedException
     */
    public static function getContainer() {
        if (static::$container === NULL) {
            throw new ContainerNotInitializedException('\\Drupal::$container is not initialized yet. \\Drupal::setContainer() must be called with a real container.');
        }
        return static::$container;
    }
    
    /**
     * Returns TRUE if the container has been initialized, FALSE otherwise.
     *
     * @return bool
     */
    public static function hasContainer() {
        return static::$container !== NULL;
    }
    
    /**
     * Retrieves a service from the container.
     *
     * Use this method if the desired service is not one of those with a dedicated
     * accessor method below. If it is listed below, those methods are preferred
     * as they can return useful type hints.
     *
     * @param string $id
     *   The ID of the service to retrieve.
     *
     * @return mixed
     *   The specified service.
     */
    public static function service($id) {
        return static::getContainer()->get($id);
    }
    
    /**
     * Indicates if a service is defined in the container.
     *
     * @param string $id
     *   The ID of the service to check.
     *
     * @return bool
     *   TRUE if the specified service exists, FALSE otherwise.
     */
    public static function hasService($id) {
        // Check hasContainer() first in order to always return a Boolean.
        return static::hasContainer() && static::getContainer()->has($id);
    }
    
    /**
     * Gets the app root.
     *
     * @return string
     */
    public static function root() {
        return static::getContainer()->getParameter('app.root');
    }
    
    /**
     * Gets the active install profile.
     *
     * @return string|false|null
     *   The name of the active install profile. FALSE indicates that the site is
     *   not using an install profile. NULL indicates that the site has not yet
     *   been installed.
     */
    public static function installProfile() {
        return static::getContainer()->getParameter('install_profile');
    }
    
    /**
     * Indicates if there is a currently active request object.
     *
     * @return bool
     *   TRUE if there is a currently active request object, FALSE otherwise.
     */
    public static function hasRequest() {
        // Check hasContainer() first in order to always return a Boolean.
        return static::hasContainer() && static::getContainer()->has('request_stack') && static::getContainer()->get('request_stack')
            ->getCurrentRequest() !== NULL;
    }
    
    /**
     * Retrieves the currently active request object.
     *
     * Note: The use of this wrapper in particular is especially discouraged. Most
     * code should not need to access the request directly.  Doing so means it
     * will only function when handling an HTTP request, and will require special
     * modification or wrapping when run from a command line tool, from certain
     * queue processors, or from automated tests.
     *
     * If code must access the request, it is considerably better to register
     * an object with the Service Container and give it a setRequest() method
     * that is configured to run when the service is created.  That way, the
     * correct request object can always be provided by the container and the
     * service can still be unit tested.
     *
     * If this method must be used, never save the request object that is
     * returned.  Doing so may lead to inconsistencies as the request object is
     * volatile and may change at various times, such as during a subrequest.
     *
     * @return \Symfony\Component\HttpFoundation\Request
     *   The currently active request object.
     */
    public static function request() {
        return static::getContainer()->get('request_stack')
            ->getCurrentRequest();
    }
    
    /**
     * Retrieves the request stack.
     *
     * @return \Symfony\Component\HttpFoundation\RequestStack
     *   The request stack
     */
    public static function requestStack() {
        return static::getContainer()->get('request_stack');
    }
    
    /**
     * Retrieves the currently active route match object.
     *
     * @return \Drupal\Core\Routing\RouteMatchInterface
     *   The currently active route match object.
     */
    public static function routeMatch() {
        return static::getContainer()->get('current_route_match');
    }
    
    /**
     * Gets the current active user.
     *
     * This method will return the \Drupal\Core\Session\AccountProxy object of the
     * current user. You can use the \Drupal\user\Entity\User::load() method to
     * load the full user entity object. For example:
     * @code
     *   $user = \Drupal\user\Entity\User::load(\Drupal::currentUser()->id());
     * @endcode
     *
     * @return \Drupal\Core\Session\AccountProxyInterface
     */
    public static function currentUser() {
        return static::getContainer()->get('current_user');
    }
    
    /**
     * Retrieves the entity type manager.
     *
     * @return \Drupal\Core\Entity\EntityTypeManagerInterface
     *   The entity type manager.
     */
    public static function entityTypeManager() {
        return static::getContainer()->get('entity_type.manager');
    }
    
    /**
     * Returns the current primary database.
     *
     * @return \Drupal\Core\Database\Connection
     *   The current active database's master connection.
     */
    public static function database() {
        return static::getContainer()->get('database');
    }
    
    /**
     * Returns the requested cache bin.
     *
     * @param string $bin
     *   (optional) The cache bin for which the cache object should be returned,
     *   defaults to 'default'.
     *
     * @return \Drupal\Core\Cache\CacheBackendInterface
     *   The cache object associated with the specified bin.
     *
     * @ingroup cache
     */
    public static function cache($bin = 'default') {
        return static::getContainer()->get('cache.' . $bin);
    }
    
    /**
     * Retrieves the class resolver.
     *
     * This is to be used in procedural code such as module files to instantiate
     * an object of a class that implements
     * \Drupal\Core\DependencyInjection\ContainerInjectionInterface.
     *
     * One common use case is to provide a class which contains the actual code
     * of a hook implementation, without having to create a service.
     *
     * @param string $class
     *   (optional) A class name to instantiate.
     *
     * @return \Drupal\Core\DependencyInjection\ClassResolverInterface|object
     *   The class resolver or if $class is provided, a class instance with a
     *   given class definition.
     *
     * @throws \InvalidArgumentException
     *   If $class does not exist.
     */
    public static function classResolver($class = NULL) {
        if ($class) {
            return static::getContainer()->get('class_resolver')
                ->getInstanceFromDefinition($class);
        }
        return static::getContainer()->get('class_resolver');
    }
    
    /**
     * Returns an expirable key value store collection.
     *
     * @param string $collection
     *   The name of the collection holding key and value pairs.
     *
     * @return \Drupal\Core\KeyValueStore\KeyValueStoreExpirableInterface
     *   An expirable key value store collection.
     */
    public static function keyValueExpirable($collection) {
        return static::getContainer()->get('keyvalue.expirable')
            ->get($collection);
    }
    
    /**
     * Returns the locking layer instance.
     *
     * @return \Drupal\Core\Lock\LockBackendInterface
     *
     * @ingroup lock
     */
    public static function lock() {
        return static::getContainer()->get('lock');
    }
    
    /**
     * Retrieves a configuration object.
     *
     * This is the main entry point to the configuration API. Calling
     * @code \Drupal::config('my_module.admin') @endcode will return a
     * configuration object the my_module module can use to read its
     * administrative settings.
     *
     * @param string $name
     *   The name of the configuration object to retrieve, which typically
     *   corresponds to a configuration file. For
     *   @code \Drupal::config('my_module.admin') @endcode, the configuration
     *   object returned will contain the content of the my_module.admin
     *   configuration file.
     *
     * @return \Drupal\Core\Config\ImmutableConfig
     *   An immutable configuration object.
     */
    public static function config($name) {
        return static::getContainer()->get('config.factory')
            ->get($name);
    }
    
    /**
     * Retrieves the configuration factory.
     *
     * This is mostly used to change the override settings on the configuration
     * factory. For example, changing the language, or turning all overrides on
     * or off.
     *
     * @return \Drupal\Core\Config\ConfigFactoryInterface
     *   The configuration factory service.
     */
    public static function configFactory() {
        return static::getContainer()->get('config.factory');
    }
    
    /**
     * Returns a queue for the given queue name.
     *
     * The following values can be set in your settings.php file's $settings
     * array to define which services are used for queues:
     * - queue_reliable_service_$name: The container service to use for the
     *   reliable queue $name.
     * - queue_service_$name: The container service to use for the
     *   queue $name.
     * - queue_default: The container service to use by default for queues
     *   without overrides. This defaults to 'queue.database'.
     *
     * @param string $name
     *   The name of the queue to work with.
     * @param bool $reliable
     *   (optional) TRUE if the ordering of items and guaranteeing every item
     *   executes at least once is important, FALSE if scalability is the main
     *   concern. Defaults to FALSE.
     *
     * @return \Drupal\Core\Queue\QueueInterface
     *   The queue object for a given name.
     */
    public static function queue($name, $reliable = FALSE) {
        return static::getContainer()->get('queue')
            ->get($name, $reliable);
    }
    
    /**
     * Returns a key/value storage collection.
     *
     * @param string $collection
     *   Name of the key/value collection to return.
     *
     * @return \Drupal\Core\KeyValueStore\KeyValueStoreInterface
     */
    public static function keyValue($collection) {
        return static::getContainer()->get('keyvalue')
            ->get($collection);
    }
    
    /**
     * Returns the state storage service.
     *
     * Use this to store machine-generated data, local to a specific environment
     * that does not need deploying and does not need human editing; for example,
     * the last time cron was run. Data which needs to be edited by humans and
     * needs to be the same across development, production, etc. environments
     * (for example, the system maintenance message) should use \Drupal::config() instead.
     *
     * @return \Drupal\Core\State\StateInterface
     */
    public static function state() {
        return static::getContainer()->get('state');
    }
    
    /**
     * Returns the default http client.
     *
     * @return \GuzzleHttp\Client
     *   A guzzle http client instance.
     */
    public static function httpClient() {
        return static::getContainer()->get('http_client');
    }
    
    /**
     * Returns the entity query object for this entity type.
     *
     * @param string $entity_type
     *   The entity type (for example, node) for which the query object should be
     *   returned.
     * @param string $conjunction
     *   (optional) Either 'AND' if all conditions in the query need to apply, or
     *   'OR' if any of them is sufficient. Defaults to 'AND'.
     *
     * @return \Drupal\Core\Entity\Query\QueryInterface
     *   The query object that can query the given entity type.
     */
    public static function entityQuery($entity_type, $conjunction = 'AND') {
        return static::entityTypeManager()->getStorage($entity_type)
            ->getQuery($conjunction);
    }
    
    /**
     * Returns the entity query aggregate object for this entity type.
     *
     * @param string $entity_type
     *   The entity type (for example, node) for which the query object should be
     *   returned.
     * @param string $conjunction
     *   (optional) Either 'AND' if all conditions in the query need to apply, or
     *   'OR' if any of them is sufficient. Defaults to 'AND'.
     *
     * @return \Drupal\Core\Entity\Query\QueryAggregateInterface
     *   The query object that can query the given entity type.
     */
    public static function entityQueryAggregate($entity_type, $conjunction = 'AND') {
        return static::entityTypeManager()->getStorage($entity_type)
            ->getAggregateQuery($conjunction);
    }
    
    /**
     * Returns the flood instance.
     *
     * @return \Drupal\Core\Flood\FloodInterface
     */
    public static function flood() {
        return static::getContainer()->get('flood');
    }
    
    /**
     * Returns the module handler.
     *
     * @return \Drupal\Core\Extension\ModuleHandlerInterface
     */
    public static function moduleHandler() {
        return static::getContainer()->get('module_handler');
    }
    
    /**
     * Returns the typed data manager service.
     *
     * Use the typed data manager service for creating typed data objects.
     *
     * @return \Drupal\Core\TypedData\TypedDataManagerInterface
     *   The typed data manager.
     *
     * @see \Drupal\Core\TypedData\TypedDataManager::create()
     */
    public static function typedDataManager() {
        return static::getContainer()->get('typed_data_manager');
    }
    
    /**
     * Returns the token service.
     *
     * @return \Drupal\Core\Utility\Token
     *   The token service.
     */
    public static function token() {
        return static::getContainer()->get('token');
    }
    
    /**
     * Returns the URL generator service.
     *
     * @return \Drupal\Core\Routing\UrlGeneratorInterface
     *   The URL generator service.
     */
    public static function urlGenerator() {
        return static::getContainer()->get('url_generator');
    }
    
    /**
     * Returns the link generator service.
     *
     * @return \Drupal\Core\Utility\LinkGeneratorInterface
     */
    public static function linkGenerator() {
        return static::getContainer()->get('link_generator');
    }
    
    /**
     * Returns the string translation service.
     *
     * @return \Drupal\Core\StringTranslation\TranslationManager
     *   The string translation manager.
     */
    public static function translation() {
        return static::getContainer()->get('string_translation');
    }
    
    /**
     * Returns the language manager service.
     *
     * @return \Drupal\Core\Language\LanguageManagerInterface
     *   The language manager.
     */
    public static function languageManager() {
        return static::getContainer()->get('language_manager');
    }
    
    /**
     * Returns the CSRF token manager service.
     *
     * The generated token is based on the session ID of the current user. Normally,
     * anonymous users do not have a session, so the generated token will be
     * different on every page request. To generate a token for users without a
     * session, manually start a session prior to calling this function.
     *
     * @return \Drupal\Core\Access\CsrfTokenGenerator
     *   The CSRF token manager.
     *
     * @see \Drupal\Core\Session\SessionManager::start()
     */
    public static function csrfToken() {
        return static::getContainer()->get('csrf_token');
    }
    
    /**
     * Returns the transliteration service.
     *
     * @return \Drupal\Core\Transliteration\PhpTransliteration
     *   The transliteration manager.
     */
    public static function transliteration() {
        return static::getContainer()->get('transliteration');
    }
    
    /**
     * Returns the form builder service.
     *
     * @return \Drupal\Core\Form\FormBuilderInterface
     *   The form builder.
     */
    public static function formBuilder() {
        return static::getContainer()->get('form_builder');
    }
    
    /**
     * Gets the theme service.
     *
     * @return \Drupal\Core\Theme\ThemeManagerInterface
     */
    public static function theme() {
        return static::getContainer()->get('theme.manager');
    }
    
    /**
     * Gets the syncing state.
     *
     * @return bool
     *   Returns TRUE is syncing flag set.
     */
    public static function isConfigSyncing() {
        return static::getContainer()->get('config.installer')
            ->isSyncing();
    }
    
    /**
     * Returns a channel logger object.
     *
     * @param string $channel
     *   The name of the channel. Can be any string, but the general practice is
     *   to use the name of the subsystem calling this.
     *
     * @return \Psr\Log\LoggerInterface
     *   The logger for this channel.
     */
    public static function logger($channel) {
        return static::getContainer()->get('logger.factory')
            ->get($channel);
    }
    
    /**
     * Returns the menu tree.
     *
     * @return \Drupal\Core\Menu\MenuLinkTreeInterface
     *   The menu tree.
     */
    public static function menuTree() {
        return static::getContainer()->get('menu.link_tree');
    }
    
    /**
     * Returns the path validator.
     *
     * @return \Drupal\Core\Path\PathValidatorInterface
     */
    public static function pathValidator() {
        return static::getContainer()->get('path.validator');
    }
    
    /**
     * Returns the access manager service.
     *
     * @return \Drupal\Core\Access\AccessManagerInterface
     *   The access manager service.
     */
    public static function accessManager() {
        return static::getContainer()->get('access_manager');
    }
    
    /**
     * Returns the redirect destination helper.
     *
     * @return \Drupal\Core\Routing\RedirectDestinationInterface
     *   The redirect destination helper.
     */
    public static function destination() {
        return static::getContainer()->get('redirect.destination');
    }
    
    /**
     * Returns the entity definition update manager.
     *
     * @return \Drupal\Core\Entity\EntityDefinitionUpdateManagerInterface
     *   The entity definition update manager.
     */
    public static function entityDefinitionUpdateManager() {
        return static::getContainer()->get('entity.definition_update_manager');
    }
    
    /**
     * Returns the time service.
     *
     * @return \Drupal\Component\Datetime\TimeInterface
     *   The time service.
     */
    public static function time() {
        return static::getContainer()->get('datetime.time');
    }
    
    /**
     * Returns the messenger.
     *
     * @return \Drupal\Core\Messenger\MessengerInterface
     *   The messenger.
     */
    public static function messenger() {
        return static::getContainer()->get('messenger');
    }

}