Drupal.php 20.4 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
<?php

/**
 * @file
 * Contains Drupal.
 */

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
22 23
 * \Drupal\Core\CoreServiceProvider, the service providers of enabled modules and any other
 * service providers defined in $GLOBALS['conf']['container_service_providers'].
24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
 *
 * 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() {
40
 *     $lock = \Drupal::lock()->acquire('stuff_lock');
41 42 43 44 45 46
 *     // ...
 *   }
 *
 *   // The preferred way: dependency injected code.
 *   function hook_do_stuff() {
 *     // Move the actual implementation to a class and instantiate it.
47
 *     $instance = new StuffDoingClass(\Drupal::lock());
48 49 50 51 52 53
 *     $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.
54
 *     \Drupal::service('stuff.doing')->doStuff();
55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78
 *   }
 *
 *   interface StuffDoingInterface {
 *     public function doStuff();
 *   }
 *
 *   class StuffDoingClass implements StuffDoingInterface {
 *     protected $lockBackend;
 *
 *     public function __construct(LockBackendInterface $lockBackend) {
 *       $this->lockBackend = $lockBackend;
 *     }
 *
 *     public function doStuff() {
 *       $lock = $this->lockBackend->acquire('stuff_lock');
 *       // ...
 *     }
 *   }
 * @endcode
 *
 * @see \Drupal\Core\DrupalKernel
 */
class Drupal {

79 80 81 82 83 84 85 86 87 88
  /**
   * The current system version.
   */
  const VERSION = '8.0-dev';

  /**
   * Core API compatibility.
   */
  const CORE_COMPATIBILITY = '8.x';

89 90 91 92 93
  /**
   * Core minimum schema version.
   */
  const CORE_MINIMUM_SCHEMA_VERSION = 8000;

94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113
  /**
   * The currently active container object.
   *
   * @var \Symfony\Component\DependencyInjection\ContainerInterface
   */
  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;
  }

  /**
   * Returns the currently active global container.
   *
114 115
   * @deprecated This method is only useful for the testing environment. It
   * should not be used otherwise.
116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138
   *
   * @return \Symfony\Component\DependencyInjection\ContainerInterface
   */
  public static function getContainer() {
    return static::$container;
  }

  /**
   * 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::$container->get($id);
  }

139 140 141 142 143 144 145 146 147 148 149 150 151
  /**
   * 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) {
    return static::$container && static::$container->has($id);
  }

152 153 154
  /**
   * Retrieves the currently active request object.
   *
155
   * Note: The use of this wrapper in particular is especially discouraged. Most
156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177
   * 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::$container->get('request');
  }

178 179 180 181 182 183 184 185 186
  /**
   * Gets the current active user.
   *
   * @return \Drupal\Core\Session\AccountInterface
   */
  public static function currentUser() {
    return static::$container->get('current_user');
  }

187 188 189
  /**
   * Retrieves the entity manager service.
   *
190
   * @return \Drupal\Core\Entity\EntityManagerInterface
191 192 193
   *   The entity manager service.
   */
  public static function entityManager() {
194
    return static::$container->get('entity.manager');
195 196
  }

197 198 199 200 201 202 203 204 205 206
  /**
   * Returns the current primary database.
   *
   * @return \Drupal\Core\Database\Connection
   *   The current active database's master connection.
   */
  public static function database() {
    return static::$container->get('database');
  }

207 208 209 210 211 212 213
  /**
   * Returns the requested cache bin.
   *
   * @param string $bin
   *   (optional) The cache bin for which the cache object should be returned,
   *   defaults to 'cache'.
   *
214
   * @return \Drupal\Core\Cache\CacheBackendInterface
215 216 217 218 219 220
   *   The cache object associated with the specified bin.
   */
  public static function cache($bin = 'cache') {
    return static::$container->get('cache.' . $bin);
  }

221 222 223 224 225 226 227 228 229 230 231 232 233
  /**
   * 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::$container->get('keyvalue.expirable')->get($collection);
  }

234 235 236 237 238 239 240 241 242
  /**
   * Returns the locking layer instance.
   *
   * @return \Drupal\Core\Lock\LockBackendInterface
   */
  public static function lock() {
    return static::$container->get('lock');
  }

243 244 245 246
  /**
   * Retrieves a configuration object.
   *
   * This is the main entry point to the configuration API. Calling
247
   * @code \Drupal::config('book.admin') @endcode will return a configuration
248 249 250 251
   * object in which the book module can store its administrative settings.
   *
   * @param string $name
   *   The name of the configuration object to retrieve. The name corresponds to
252
   *   a configuration file. For @code \Drupal::config('book.admin') @endcode, the config
253 254 255 256 257 258 259 260 261
   *   object returned will contain the contents of book.admin configuration file.
   *
   * @return \Drupal\Core\Config\Config
   *   A configuration object.
   */
  public static function config($name) {
    return static::$container->get('config.factory')->get($name);
  }

262 263 264 265 266 267 268
  /**
   * 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.
   *
269
   * @return \Drupal\Core\Config\ConfigFactoryInterface
270 271 272 273 274
   */
  public static function configFactory() {
    return static::$container->get('config.factory');
  }

275 276 277
  /**
   * Returns a queue for the given queue name.
   *
278 279 280 281 282 283 284 285
   * 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'.
286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303
   *
   * @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, $reliable = FALSE) {
    return static::$container->get('queue')->get($name, $reliable);
  }

  /**
   * Returns a key/value storage collection.
   *
304
   * @param string $collection
305 306 307 308 309 310 311 312 313 314 315 316 317 318 319
   *   Name of the key/value collection to return.
   *
   * @return \Drupal\Core\KeyValueStore\KeyValueStoreInterface
   */
  public static function keyValue($collection) {
    return static::$container->get('keyvalue')->get($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
320
   * (for example, the system maintenance message) should use \Drupal::config() instead.
321
   *
322
   * @return \Drupal\Core\KeyValueStore\StateInterface
323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354
   */
  public static function state() {
    return static::$container->get('state');
  }

  /**
   * Returns the default http client.
   *
   * @return \Guzzle\Http\ClientInterface
   *   A guzzle http client instance.
   */
  public static function httpClient() {
    return static::$container->get('http_default_client');
  }

  /**
   * Returns the entity query object for this entity type.
   *
   * @param string $entity_type
   *   The entity type, e.g. node, for which the query object should be
   *   returned.
   * @param string $conjunction
   *   AND if all conditions in the query need to apply, OR if any of them is
   *   enough. Optional, defaults to AND.
   *
   * @return \Drupal\Core\Entity\Query\QueryInterface
   *   The query object that can query the given entity type.
   */
  public static function entityQuery($entity_type, $conjunction = 'AND') {
    return static::$container->get('entity.query')->get($entity_type, $conjunction);
  }

355 356 357
  /**
   * Returns the entity query aggregate object for this entity type.
   *
358
   * @param string $entity_type
359 360
   *   The entity type, e.g. node, for which the query object should be
   *   returned.
361
   * @param string $conjunction
362 363 364 365 366 367 368 369 370 371
   *   AND if all conditions in the query need to apply, OR if any of them is
   *   enough. Optional, defaults to AND.
   *
   * @return \Drupal\Core\Entity\Query\QueryInterface
   *   The query object that can query the given entity type.
   */
  public static function entityQueryAggregate($entity_type, $conjunction = 'AND') {
    return static::$container->get('entity.query')->getAggregate($entity_type, $conjunction);
  }

372 373 374 375 376 377 378 379 380 381 382 383
  /**
   * Returns the flood instance.
   *
   * @return \Drupal\Core\Flood\FloodInterface
   */
  public static function flood() {
    return static::$container->get('flood');
  }

  /**
   * Returns the module handler.
   *
384
   * @return \Drupal\Core\Extension\ModuleHandlerInterface
385 386 387 388 389 390 391 392 393 394 395 396 397 398 399
   */
  public static function moduleHandler() {
    return static::$container->get('module_handler');
  }

  /**
   * Returns the typed data manager service.
   *
   * Use the typed data manager service for creating typed data objects.
   *
   * @return \Drupal\Core\TypedData\TypedDataManager
   *   The typed data manager.
   *
   * @see \Drupal\Core\TypedData\TypedDataManager::create()
   */
400 401
  public static function typedDataManager() {
    return static::$container->get('typed_data_manager');
402 403
  }

404 405 406 407 408 409 410 411 412 413
  /**
   * Returns the token service.
   *
   * @return \Drupal\Core\Utility\Token
   *   The token service.
   */
  public static function token() {
    return static::$container->get('token');
  }

414 415 416
  /**
   * Returns the url generator service.
   *
417
   * @return \Drupal\Core\Routing\UrlGeneratorInterface
418 419 420 421
   *   The url generator service.
   */
  public static function urlGenerator() {
    return static::$container->get('url_generator');
422 423
  }

424 425 426 427 428 429 430
  /**
   * Generates a URL or path for a specific route based on the given parameters.
   *
   * Parameters that reference placeholders in the route pattern will be
   * substituted for them in the pattern. Extra params are added as query
   * strings to the URL.
   *
431
   * @param string $route_name
432
   *   The name of the route
433
   * @param array $route_parameters
434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465
   *   An associative array of parameter names and values.
   * @param array $options
   *   (optional) An associative array of additional options, with the following
   *   elements:
   *   - 'query': An array of query key/value-pairs (without any URL-encoding)
   *     to append to the URL. Merged with the parameters array.
   *   - 'fragment': A fragment identifier (named anchor) to append to the URL.
   *     Do not include the leading '#' character.
   *   - 'absolute': Defaults to FALSE. Whether to force the output to be an
   *     absolute link (beginning with http:). Useful for links that will be
   *     displayed outside the site, such as in an RSS feed.
   *   - 'language': An optional language object used to look up the alias
   *     for the URL. If $options['language'] is omitted, the language will be
   *     obtained from language(Language::TYPE_URL).
   *   - 'https': Whether this URL should point to a secure location. If not
   *     defined, the current scheme is used, so the user stays on HTTP or HTTPS
   *     respectively. if mixed mode sessions are permitted, TRUE enforces HTTPS
   *     and FALSE enforces HTTP.
   *
   * @return string
   *   The generated URL for the given route.
   *
   * @throws \Symfony\Component\Routing\Exception\RouteNotFoundException
   *   Thrown when the named route doesn't exist.
   * @throws \Symfony\Component\Routing\Exception\MissingMandatoryParametersException
   *   Thrown when some parameters are missing that are mandatory for the route.
   * @throws \Symfony\Component\Routing\Exception\InvalidParameterException
   *   Thrown when a parameter value for a placeholder is not correct because it
   *   does not match the requirement.
   *
   * @see \Drupal\Core\Routing\UrlGeneratorInterface::generateFromRoute()
   */
466
  public static function url($route_name, $route_parameters = array(), $options = array()) {
467 468 469
    return static::$container->get('url_generator')->generateFromRoute($route_name, $route_parameters, $options);
  }

470 471 472 473 474 475 476
  /**
   * Returns the link generator service.
   *
   * @return \Drupal\Core\Utility\LinkGeneratorInterface
   */
  public static function linkGenerator() {
    return static::$container->get('link_generator');
477 478 479 480 481 482 483 484 485 486 487 488
  }

  /**
   * Renders a link to a route given a route name and its parameters.
   *
   * This function correctly handles aliased paths and sanitizing text, so all
   * internal links output by modules should be generated by this function if
   * possible.
   *
   * However, for links enclosed in translatable text you should use t() and
   * embed the HTML anchor tag directly in the translated string. For example:
   * @code
489
   * t('Visit the <a href="@url">content types</a> page', array('@url' => \Drupal::url('node.overview_types')));
490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536
   * @endcode
   * This keeps the context of the link title ('settings' in the example) for
   * translators.
   *
   * @param string|array $text
   *   The link text for the anchor tag as a translated string or render array.
   * @param string $route_name
   *   The name of the route to use to generate the link.
   * @param array $parameters
   *   (optional) Any parameters needed to render the route path pattern.
   * @param array $options
   *   (optional) An associative array of additional options. Defaults to an
   *   empty array. It may contain the following elements:
   *   - 'query': An array of query key/value-pairs (without any URL-encoding) to
   *     append to the URL.
   *   - absolute: Whether to force the output to be an absolute link (beginning
   *     with http:). Useful for links that will be displayed outside the site,
   *     such as in an RSS feed. Defaults to FALSE.
   *   - attributes: An associative array of HTML attributes to apply to the
   *     anchor tag. If element 'class' is included, it must be an array; 'title'
   *     must be a string; other elements are more flexible, as they just need
   *     to work as an argument for the constructor of the class
   *     Drupal\Core\Template\Attribute($options['attributes']).
   *   - html: Whether $text is HTML or just plain-text. For
   *     example, to make an image tag into a link, this must be set to TRUE, or
   *     you will see the escaped HTML image tag. $text is not sanitized if
   *     'html' is TRUE. The calling function must ensure that $text is already
   *     safe. Defaults to FALSE.
   *   - language: An optional language object. If the path being linked to is
   *     internal to the site, $options['language'] is used to determine whether
   *     the link is "active", or pointing to the current page (the language as
   *     well as the path must match).
   *
   * @return string
   *   An HTML string containing a link to the given route and parameters.
   *
   * @throws \Symfony\Component\Routing\Exception\RouteNotFoundException
   *   Thrown when the named route doesn't exist.
   * @throws \Symfony\Component\Routing\Exception\MissingMandatoryParametersException
   *   Thrown when some parameters are missing that are mandatory for the route.
   * @throws \Symfony\Component\Routing\Exception\InvalidParameterException
   *   Thrown when a parameter value for a placeholder is not correct because it
   *   does not match the requirement.
   *
   * @see \Drupal\Core\Routing\UrlGeneratorInterface::generateFromRoute()
   * @see \Drupal\Core\Utility\LinkGeneratorInterface::generate()
   */
537
  public static function l($text, $route_name, array $parameters = array(), array $options = array()) {
538
    return static::$container->get('link_generator')->generate($text, $route_name, $parameters, $options);
539 540
  }

541 542 543
  /**
   * Returns the string translation service.
   *
544
   * @return \Drupal\Core\StringTranslation\TranslationManager
545 546 547 548 549 550
   *   The string translation manager.
   */
  public static function translation() {
    return static::$container->get('string_translation');
  }

551 552 553
  /**
   * Returns the language manager service.
   *
554
   * @return \Drupal\Core\Language\LanguageManagerInterface
555 556 557 558 559 560
   *   The language manager.
   */
  public static function languageManager() {
    return static::$container->get('language_manager');
  }

561 562 563
  /**
   * Returns the CSRF token manager service.
   *
564 565 566 567 568
   * 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.
   *
569 570
   * @return \Drupal\Core\Access\CsrfTokenGenerator
   *   The CSRF token manager.
571 572
   *
   * @see drupal_session_start()
573 574 575 576 577
   */
  public static function csrfToken() {
    return static::$container->get('csrf_token');
  }

578 579 580 581 582 583 584 585 586 587
  /**
   * Returns the transliteration service.
   *
   * @return \Drupal\Core\Transliteration\PHPTransliteration
   *   The transliteration manager.
   */
  public static function transliteration() {
    return static::$container->get('transliteration');
  }

588 589 590 591 592 593 594 595 596 597
  /**
   * Returns the form builder service.
   *
   * @return \Drupal\Core\Form\FormBuilderInterface
   *   The form builder.
   */
  public static function formBuilder() {
    return static::$container->get('form_builder');
  }

598
}