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         protected $resourceLoader;
  34         protected $request;
  35         protected $logger;
  36
  37         // Module content vary
  38         protected $skin;
  39         protected $language;
  40         protected $debug;
  41         protected $user;
  42
  43         // Request vary (in addition to cache vary)
  44         protected $modules;
  45         protected $only;
  46         protected $version;
  47         protected $raw;
  48         protected $image;
  49         protected $variant;
  50         protected $format;
  51
  52         protected $direction;
  53         protected $hash;
  54         protected $userObj;
  55         protected $imageObj;
  56
  57         /**
  58          * @param ResourceLoader $resourceLoader
  59          * @param WebRequest $request
  60          */
  61         public function __construct( ResourceLoader $resourceLoader, WebRequest $request ) {
  62                 $this->resourceLoader = $resourceLoader;
  63                 $this->request = $request;
  64                 $this->logger = $resourceLoader->getLogger();
  65
  66                 // Future developers: Use WebRequest::getRawVal() instead of getVal().
  67                 // The getVal() method performs slow Language+UTF logic. (f303bb9360)
  68
  69                 // List of modules
  70                 $modules = $request->getRawVal( 'modules' );
  71                 $this->modules = $modules ? ResourceLoader::expandModuleNames( $modules ) : [];
  72
  73                 // Various parameters
  74                 $this->user = $request->getRawVal( 'user' );
  75                 $this->debug = $request->getRawVal( 'debug' ) === 'true';
  76                 $this->only = $request->getRawVal( 'only', null );
  77                 $this->version = $request->getRawVal( 'version', null );
  78                 $this->raw = $request->getFuzzyBool( 'raw' );
  79
  80                 // Image requests
  81                 $this->image = $request->getRawVal( 'image' );
  82                 $this->variant = $request->getRawVal( 'variant' );
  83                 $this->format = $request->getRawVal( 'format' );
  84
  85                 $this->skin = $request->getRawVal( 'skin' );
  86                 $skinnames = Skin::getSkinNames();
  87                 // If no skin is specified, or we don't recognize the skin, use the default skin
  88                 if ( !$this->skin || !isset( $skinnames[$this->skin] ) ) {
  89                         $this->skin = $this->getConfig()->get( 'DefaultSkin' );
  90                 }
  91         }
  92
  93         /**
  94          * Reverse the process done by ResourceLoader::makePackedModulesString().
  95          *
  96          * @deprecated since 1.33 Use ResourceLoader::expandModuleNames instead.
  97          * @param string $modules Packed module name list
  98          * @return array Array of module names
  99          * @codeCoverageIgnore
 100          */
 101         public static function expandModuleNames( $modules ) {
 102                 wfDeprecated( __METHOD__, '1.33' );
 103                 return ResourceLoader::expandModuleNames( $modules );
 104         }
 105
 106         /**
 107          * Return a dummy ResourceLoaderContext object suitable for passing into
 108          * things that don't "really" need a context.
 109          *
 110          * Use cases:
 111          * - Unit tests (deprecated, create empty instance directly or use RLTestCase).
 112          *
 113          * @return ResourceLoaderContext
 114          */
 115         public static function newDummyContext() {
 116                 // This currently creates a non-empty instance of ResourceLoader (all modules registered),
 117                 // but that's probably not needed. So once that moves into ServiceWiring, this'll
 118                 // become more like the EmptyResourceLoader class we have in PHPUnit tests, which
 119                 // is what this should've had originally. If this turns out to be untrue, change to:
 120                 // `MediaWikiServices::getInstance()->getResourceLoader()` instead.
 121                 return new self( new ResourceLoader(
 122                         MediaWikiServices::getInstance()->getMainConfig(),
 123                         LoggerFactory::getInstance( 'resourceloader' )
 124                 ), new FauxRequest( [] ) );
 125         }
 126
 127         /**
 128          * @return ResourceLoader
 129          */
 130         public function getResourceLoader() {
 131                 return $this->resourceLoader;
 132         }
 133
 134         /**
 135          * @return Config
 136          */
 137         public function getConfig() {
 138                 return $this->getResourceLoader()->getConfig();
 139         }
 140
 141         /**
 142          * @return WebRequest
 143          */
 144         public function getRequest() {
 145                 return $this->request;
 146         }
 147
 148         /**
 149          * @since 1.27
 150          * @return \Psr\Log\LoggerInterface
 151          */
 152         public function getLogger() {
 153                 return $this->logger;
 154         }
 155
 156         /**
 157          * @return array
 158          */
 159         public function getModules() {
 160                 return $this->modules;
 161         }
 162
 163         /**
 164          * @return string
 165          */
 166         public function getLanguage() {
 167                 if ( $this->language === null ) {
 168                         // Must be a valid language code after this point (T64849)
 169                         // Only support uselang values that follow built-in conventions (T102058)
 170                         $lang = $this->getRequest()->getRawVal( 'lang', '' );
 171                         // Stricter version of RequestContext::sanitizeLangCode()
 172                         if ( !Language::isValidBuiltInCode( $lang ) ) {
 173                                 $lang = $this->getConfig()->get( 'LanguageCode' );
 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                         $this->direction = $this->getRequest()->getRawVal( 'dir' );
 186                         if ( !$this->direction ) {
 187                                 // Determine directionality based on user language (T8100)
 188                                 $this->direction = Language::factory( $this->getLanguage() )->getDir();
 189                         }
 190                 }
 191                 return $this->direction;
 192         }
 193
 194         /**
 195          * @return string
 196          */
 197         public function getSkin() {
 198                 return $this->skin;
 199         }
 200
 201         /**
 202          * @return string|null
 203          */
 204         public function getUser() {
 205                 return $this->user;
 206         }
 207
 208         /**
 209          * Get a Message object with context set.  See wfMessage for parameters.
 210          *
 211          * @since 1.27
 212          * @param string|string[]|MessageSpecifier $key Message key, or array of keys,
 213          *   or a MessageSpecifier.
 214          * @param mixed $args,...
 215          * @return Message
 216          */
 217         public function msg( $key ) {
 218                 return wfMessage( ...func_get_args() )
 219                         ->inLanguage( $this->getLanguage() )
 220                         // Use a dummy title because there is no real title
 221                         // for this endpoint, and the cache won't vary on it
 222                         // anyways.
 223                         ->title( Title::newFromText( 'Dwimmerlaik' ) );
 224         }
 225
 226         /**
 227          * Get the possibly-cached User object for the specified username
 228          *
 229          * @since 1.25
 230          * @return User
 231          */
 232         public function getUserObj() {
 233                 if ( $this->userObj === null ) {
 234                         $username = $this->getUser();
 235                         if ( $username ) {
 236                                 // Use provided username if valid, fallback to anonymous user
 237                                 $this->userObj = User::newFromName( $username ) ?: new User;
 238                         } else {
 239                                 // Anonymous user
 240                                 $this->userObj = new User;
 241                         }
 242                 }
 243
 244                 return $this->userObj;
 245         }
 246
 247         /**
 248          * @return bool
 249          */
 250         public function getDebug() {
 251                 return $this->debug;
 252         }
 253
 254         /**
 255          * @return string|null
 256          */
 257         public function getOnly() {
 258                 return $this->only;
 259         }
 260
 261         /**
 262          * @see ResourceLoaderModule::getVersionHash
 263          * @see ResourceLoaderClientHtml::makeLoad
 264          * @return string|null
 265          */
 266         public function getVersion() {
 267                 return $this->version;
 268         }
 269
 270         /**
 271          * @return bool
 272          */
 273         public function getRaw() {
 274                 return $this->raw;
 275         }
 276
 277         /**
 278          * @return string|null
 279          */
 280         public function getImage() {
 281                 return $this->image;
 282         }
 283
 284         /**
 285          * @return string|null
 286          */
 287         public function getVariant() {
 288                 return $this->variant;
 289         }
 290
 291         /**
 292          * @return string|null
 293          */
 294         public function getFormat() {
 295                 return $this->format;
 296         }
 297
 298         /**
 299          * If this is a request for an image, get the ResourceLoaderImage object.
 300          *
 301          * @since 1.25
 302          * @return ResourceLoaderImage|bool false if a valid object cannot be created
 303          */
 304         public function getImageObj() {
 305                 if ( $this->imageObj === null ) {
 306                         $this->imageObj = false;
 307
 308                         if ( !$this->image ) {
 309                                 return $this->imageObj;
 310                         }
 311
 312                         $modules = $this->getModules();
 313                         if ( count( $modules ) !== 1 ) {
 314                                 return $this->imageObj;
 315                         }
 316
 317                         $module = $this->getResourceLoader()->getModule( $modules[0] );
 318                         if ( !$module || !$module instanceof ResourceLoaderImageModule ) {
 319                                 return $this->imageObj;
 320                         }
 321
 322                         $image = $module->getImage( $this->image, $this );
 323                         if ( !$image ) {
 324                                 return $this->imageObj;
 325                         }
 326
 327                         $this->imageObj = $image;
 328                 }
 329
 330                 return $this->imageObj;
 331         }
 332
 333         /**
 334          * Return the replaced-content mapping callback
 335          *
 336          * When editing a page that's used to generate the scripts or styles of a
 337          * ResourceLoaderWikiModule, a preview should use the to-be-saved version of
 338          * the page rather than the current version in the database. A context
 339          * supporting such previews should return a callback to return these
 340          * mappings here.
 341          *
 342          * @since 1.32
 343          * @return callable|null Signature is `Content|null func( Title $t )`
 344          */
 345         public function getContentOverrideCallback() {
 346                 return null;
 347         }
 348
 349         /**
 350          * @return bool
 351          */
 352         public function shouldIncludeScripts() {
 353                 return $this->getOnly() === null || $this->getOnly() === 'scripts';
 354         }
 355
 356         /**
 357          * @return bool
 358          */
 359         public function shouldIncludeStyles() {
 360                 return $this->getOnly() === null || $this->getOnly() === 'styles';
 361         }
 362
 363         /**
 364          * @return bool
 365          */
 366         public function shouldIncludeMessages() {
 367                 return $this->getOnly() === null;
 368         }
 369
 370         /**
 371          * All factors that uniquely identify this request, except 'modules'.
 372          *
 373          * The list of modules is excluded here for legacy reasons as most callers already
 374          * split up handling of individual modules. Including it here would massively fragment
 375          * the cache and decrease its usefulness.
 376          *
 377          * E.g. Used by RequestFileCache to form a cache key for storing the reponse output.
 378          *
 379          * @return string
 380          */
 381         public function getHash() {
 382                 if ( !isset( $this->hash ) ) {
 383                         $this->hash = implode( '|', [
 384                                 // Module content vary
 385                                 $this->getLanguage(),
 386                                 $this->getSkin(),
 387                                 $this->getDebug(),
 388                                 $this->getUser(),
 389                                 // Request vary
 390                                 $this->getOnly(),
 391                                 $this->getVersion(),
 392                                 $this->getRaw(),
 393                                 $this->getImage(),
 394                                 $this->getVariant(),
 395                                 $this->getFormat(),
 396                         ] );
 397                 }
 398                 return $this->hash;
 399         }
 400 }