includes/resourceloader/ResourceLoaderContext.php

   1 <?php
   2 /**
   3  * Context for ResourceLoader modules.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @author Trevor Parscal
  22  * @author Roan Kattouw
  23  */
  24
  25 use MediaWiki\Logger\LoggerFactory;
  26 use MediaWiki\MediaWikiServices;
  27
  28 /**
  29  * Object passed around to modules which contains information about the state
  30  * of a specific loader request.
  31  */
  32 class ResourceLoaderContext implements MessageLocalizer {
  33         const DEFAULT_LANG = 'qqx';
  34         const DEFAULT_SKIN = 'fallback';
  35
  36         protected $resourceLoader;
  37         protected $request;
  38         protected $logger;
  39
  40         // Module content vary
  41         protected $skin;
  42         protected $language;
  43         protected $debug;
  44         protected $user;
  45
  46         // Request vary (in addition to cache vary)
  47         protected $modules;
  48         protected $only;
  49         protected $version;
  50         protected $raw;
  51         protected $image;
  52         protected $variant;
  53         protected $format;
  54
  55         protected $direction;
  56         protected $hash;
  57         protected $userObj;
  58         protected $imageObj;
  59
  60         /**
  61          * @param ResourceLoader $resourceLoader
  62          * @param WebRequest $request
  63          */
  64         public function __construct( ResourceLoader $resourceLoader, WebRequest $request ) {
  65                 $this->resourceLoader = $resourceLoader;
  66                 $this->request = $request;
  67                 $this->logger = $resourceLoader->getLogger();
  68
  69                 // Optimisation: Use WebRequest::getRawVal() instead of getVal(). We don't
  70                 // need the slow Language+UTF logic meant for user input here. (f303bb9360)
  71
  72                 // List of modules
  73                 $modules = $request->getRawVal( 'modules' );
  74                 $this->modules = $modules ? ResourceLoader::expandModuleNames( $modules ) : [];
  75
  76                 // Various parameters
  77                 $this->user = $request->getRawVal( 'user' );
  78                 $this->debug = $request->getRawVal( 'debug' ) === 'true';
  79                 $this->only = $request->getRawVal( 'only', null );
  80                 $this->version = $request->getRawVal( 'version', null );
  81                 $this->raw = $request->getFuzzyBool( 'raw' );
  82
  83                 // Image requests
  84                 $this->image = $request->getRawVal( 'image' );
  85                 $this->variant = $request->getRawVal( 'variant' );
  86                 $this->format = $request->getRawVal( 'format' );
  87
  88                 $this->skin = $request->getRawVal( 'skin' );
  89                 $skinnames = Skin::getSkinNames();
  90                 if ( !$this->skin || !isset( $skinnames[$this->skin] ) ) {
  91                         // The 'skin' parameter is required. (Not yet enforced.)
  92                         // For requests without a known skin specified,
  93                         // use MediaWiki's 'fallback' skin for skin-specific decisions.
  94                         $this->skin = self::DEFAULT_SKIN;
  95                 }
  96         }
  97
  98         /**
  99          * Return a dummy ResourceLoaderContext object suitable for passing into
 100          * things that don't "really" need a context.
 101          *
 102          * Use cases:
 103          * - Unit tests (deprecated, create empty instance directly or use RLTestCase).
 104          *
 105          * @return ResourceLoaderContext
 106          */
 107         public static function newDummyContext() {
 108                 // This currently creates a non-empty instance of ResourceLoader (all modules registered),
 109                 // but that's probably not needed. So once that moves into ServiceWiring, this'll
 110                 // become more like the EmptyResourceLoader class we have in PHPUnit tests, which
 111                 // is what this should've had originally. If this turns out to be untrue, change to:
 112                 // `MediaWikiServices::getInstance()->getResourceLoader()` instead.
 113                 return new self( new ResourceLoader(
 114                         MediaWikiServices::getInstance()->getMainConfig(),
 115                         LoggerFactory::getInstance( 'resourceloader' )
 116                 ), new FauxRequest( [] ) );
 117         }
 118
 119         /**
 120          * @return ResourceLoader
 121          */
 122         public function getResourceLoader() {
 123                 return $this->resourceLoader;
 124         }
 125
 126         /**
 127          * @deprecated since 1.34 Use ResourceLoaderModule::getConfig instead
 128          * inside module methods. Use ResourceLoader::getConfig elsewhere.
 129          * @return Config
 130          * @codeCoverageIgnore
 131          */
 132         public function getConfig() {
 133                 wfDeprecated( __METHOD__, '1.34' );
 134                 return $this->getResourceLoader()->getConfig();
 135         }
 136
 137         /**
 138          * @return WebRequest
 139          */
 140         public function getRequest() {
 141                 return $this->request;
 142         }
 143
 144         /**
 145          * @deprecated since 1.34 Use ResourceLoaderModule::getLogger instead
 146          * inside module methods. Use ResourceLoader::getLogger elsewhere.
 147          * @since 1.27
 148          * @return \Psr\Log\LoggerInterface
 149          */
 150         public function getLogger() {
 151                 return $this->logger;
 152         }
 153
 154         /**
 155          * @return array
 156          */
 157         public function getModules() {
 158                 return $this->modules;
 159         }
 160
 161         /**
 162          * @return string
 163          */
 164         public function getLanguage() {
 165                 if ( $this->language === null ) {
 166                         // Must be a valid language code after this point (T64849)
 167                         // Only support uselang values that follow built-in conventions (T102058)
 168                         $lang = $this->getRequest()->getRawVal( 'lang', '' );
 169                         // Stricter version of RequestContext::sanitizeLangCode()
 170                         if ( !Language::isValidBuiltInCode( $lang ) ) {
 171                                 // The 'lang' parameter is required. (Not yet enforced.)
 172                                 // If omitted, localise with the dummy language code.
 173                                 $lang = self::DEFAULT_LANG;
 174                         }
 175                         $this->language = $lang;
 176                 }
 177                 return $this->language;
 178         }
 179
 180         /**
 181          * @return string
 182          */
 183         public function getDirection() {
 184                 if ( $this->direction === null ) {
 185                         $direction = $this->getRequest()->getRawVal( 'dir' );
 186                         if ( $direction === 'ltr' || $direction === 'rtl' ) {
 187                                 $this->direction = $direction;
 188                         } else {
 189                                 // Determine directionality based on user language (T8100)
 190                                 $this->direction = Language::factory( $this->getLanguage() )->getDir();
 191                         }
 192                 }
 193                 return $this->direction;
 194         }
 195
 196         /**
 197          * @return string
 198          */
 199         public function getSkin() {
 200                 return $this->skin;
 201         }
 202
 203         /**
 204          * @return string|null
 205          */
 206         public function getUser() {
 207                 return $this->user;
 208         }
 209
 210         /**
 211          * Get a Message object with context set.  See wfMessage for parameters.
 212          *
 213          * @since 1.27
 214          * @param string|string[]|MessageSpecifier $key Message key, or array of keys,
 215          *   or a MessageSpecifier.
 216          * @param mixed $args,...
 217          * @return Message
 218          */
 219         public function msg( $key ) {
 220                 return wfMessage( ...func_get_args() )
 221                         ->inLanguage( $this->getLanguage() )
 222                         // Use a dummy title because there is no real title
 223                         // for this endpoint, and the cache won't vary on it
 224                         // anyways.
 225                         ->title( Title::newFromText( 'Dwimmerlaik' ) );
 226         }
 227
 228         /**
 229          * Get the possibly-cached User object for the specified username
 230          *
 231          * @since 1.25
 232          * @return User
 233          */
 234         public function getUserObj() {
 235                 if ( $this->userObj === null ) {
 236                         $username = $this->getUser();
 237                         if ( $username ) {
 238                                 // Use provided username if valid, fallback to anonymous user
 239                                 $this->userObj = User::newFromName( $username ) ?: new User;
 240                         } else {
 241                                 // Anonymous user
 242                                 $this->userObj = new User;
 243                         }
 244                 }
 245
 246                 return $this->userObj;
 247         }
 248
 249         /**
 250          * @return bool
 251          */
 252         public function getDebug() {
 253                 return $this->debug;
 254         }
 255
 256         /**
 257          * @return string|null
 258          */
 259         public function getOnly() {
 260                 return $this->only;
 261         }
 262
 263         /**
 264          * @see ResourceLoaderModule::getVersionHash
 265          * @see ResourceLoaderClientHtml::makeLoad
 266          * @return string|null
 267          */
 268         public function getVersion() {
 269                 return $this->version;
 270         }
 271
 272         /**
 273          * @return bool
 274          */
 275         public function getRaw() {
 276                 return $this->raw;
 277         }
 278
 279         /**
 280          * @return string|null
 281          */
 282         public function getImage() {
 283                 return $this->image;
 284         }
 285
 286         /**
 287          * @return string|null
 288          */
 289         public function getVariant() {
 290                 return $this->variant;
 291         }
 292
 293         /**
 294          * @return string|null
 295          */
 296         public function getFormat() {
 297                 return $this->format;
 298         }
 299
 300         /**
 301          * If this is a request for an image, get the ResourceLoaderImage object.
 302          *
 303          * @since 1.25
 304          * @return ResourceLoaderImage|bool false if a valid object cannot be created
 305          */
 306         public function getImageObj() {
 307                 if ( $this->imageObj === null ) {
 308                         $this->imageObj = false;
 309
 310                         if ( !$this->image ) {
 311                                 return $this->imageObj;
 312                         }
 313
 314                         $modules = $this->getModules();
 315                         if ( count( $modules ) !== 1 ) {
 316                                 return $this->imageObj;
 317                         }
 318
 319                         $module = $this->getResourceLoader()->getModule( $modules[0] );
 320                         if ( !$module || !$module instanceof ResourceLoaderImageModule ) {
 321                                 return $this->imageObj;
 322                         }
 323
 324                         $image = $module->getImage( $this->image, $this );
 325                         if ( !$image ) {
 326                                 return $this->imageObj;
 327                         }
 328
 329                         $this->imageObj = $image;
 330                 }
 331
 332                 return $this->imageObj;
 333         }
 334
 335         /**
 336          * Return the replaced-content mapping callback
 337          *
 338          * When editing a page that's used to generate the scripts or styles of a
 339          * ResourceLoaderWikiModule, a preview should use the to-be-saved version of
 340          * the page rather than the current version in the database. A context
 341          * supporting such previews should return a callback to return these
 342          * mappings here.
 343          *
 344          * @since 1.32
 345          * @return callable|null Signature is `Content|null func( Title $t )`
 346          */
 347         public function getContentOverrideCallback() {
 348                 return null;
 349         }
 350
 351         /**
 352          * @return bool
 353          */
 354         public function shouldIncludeScripts() {
 355                 return $this->getOnly() === null || $this->getOnly() === 'scripts';
 356         }
 357
 358         /**
 359          * @return bool
 360          */
 361         public function shouldIncludeStyles() {
 362                 return $this->getOnly() === null || $this->getOnly() === 'styles';
 363         }
 364
 365         /**
 366          * @return bool
 367          */
 368         public function shouldIncludeMessages() {
 369                 return $this->getOnly() === null;
 370         }
 371
 372         /**
 373          * All factors that uniquely identify this request, except 'modules'.
 374          *
 375          * The list of modules is excluded here for legacy reasons as most callers already
 376          * split up handling of individual modules. Including it here would massively fragment
 377          * the cache and decrease its usefulness.
 378          *
 379          * E.g. Used by RequestFileCache to form a cache key for storing the reponse output.
 380          *
 381          * @return string
 382          */
 383         public function getHash() {
 384                 if ( !isset( $this->hash ) ) {
 385                         $this->hash = implode( '|', [
 386                                 // Module content vary
 387                                 $this->getLanguage(),
 388                                 $this->getSkin(),
 389                                 $this->getDebug(),
 390                                 $this->getUser(),
 391                                 // Request vary
 392                                 $this->getOnly(),
 393                                 $this->getVersion(),
 394                                 $this->getRaw(),
 395                                 $this->getImage(),
 396                                 $this->getVariant(),
 397                                 $this->getFormat(),
 398                         ] );
 399                 }
 400                 return $this->hash;
 401         }
 402
 403         /**
 404          * Get the request base parameters, omitting any defaults.
 405          *
 406          * @internal For internal use by ResourceLoaderStartUpModule only
 407          * @return array
 408          */
 409         public function getReqBase() {
 410                 $reqBase = [];
 411                 if ( $this->getLanguage() !== self::DEFAULT_LANG ) {
 412                         $reqBase['lang'] = $this->getLanguage();
 413                 }
 414                 if ( $this->getSkin() !== self::DEFAULT_SKIN ) {
 415                         $reqBase['skin'] = $this->getSkin();
 416                 }
 417                 if ( $this->getDebug() ) {
 418                         $reqBase['debug'] = 'true';
 419                 }
 420                 return $reqBase;
 421         }
 422 }