includes/resourceloader/ResourceLoaderClientHtml.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  */
  20
  21 use WrappedString\WrappedStringList;
  22
  23 /**
  24  * Bootstrap a ResourceLoader client on an HTML page.
  25  *
  26  * @since 1.28
  27  */
  28 class ResourceLoaderClientHtml {
  29
  30         /** @var ResourceLoaderContext */
  31         private $context;
  32
  33         /** @var ResourceLoader */
  34         private $resourceLoader;
  35
  36         /** @var string|null */
  37         private $target;
  38
  39         /** @var array */
  40         private $config = [];
  41
  42         /** @var array */
  43         private $modules = [];
  44
  45         /** @var array */
  46         private $moduleStyles = [];
  47
  48         /** @var array */
  49         private $moduleScripts = [];
  50
  51         /** @var array */
  52         private $exemptStates = [];
  53
  54         /** @var array */
  55         private $data;
  56
  57         /**
  58          * @param ResourceLoaderContext $context
  59          * @param string|null $target [optional] Custom 'target' parameter for the startup module
  60          */
  61         public function __construct( ResourceLoaderContext $context, $target = null ) {
  62                 $this->context = $context;
  63                 $this->resourceLoader = $context->getResourceLoader();
  64                 $this->target = $target;
  65         }
  66
  67         /**
  68          * Set mw.config variables.
  69          *
  70          * @param array $vars Array of key/value pairs
  71          */
  72         public function setConfig( array $vars ) {
  73                 foreach ( $vars as $key => $value ) {
  74                         $this->config[$key] = $value;
  75                 }
  76         }
  77
  78         /**
  79          * Ensure one or more modules are loaded.
  80          *
  81          * @param array $modules Array of module names
  82          */
  83         public function setModules( array $modules ) {
  84                 $this->modules = $modules;
  85         }
  86
  87         /**
  88          * Ensure the styles of one or more modules are loaded.
  89          *
  90          * @deprecated since 1.28
  91          * @param array $modules Array of module names
  92          */
  93         public function setModuleStyles( array $modules ) {
  94                 $this->moduleStyles = $modules;
  95         }
  96
  97         /**
  98          * Ensure the scripts of one or more modules are loaded.
  99          *
 100          * @deprecated since 1.28
 101          * @param array $modules Array of module names
 102          */
 103         public function setModuleScripts( array $modules ) {
 104                 $this->moduleScripts = $modules;
 105         }
 106
 107         /**
 108          * Set state of special modules that are handled by the caller manually.
 109          *
 110          * See OutputPage::buildExemptModules() for use cases.
 111          *
 112          * @param array $modules Module state keyed by module name
 113          */
 114         public function setExemptStates( array $states ) {
 115                 $this->exemptStates = $states;
 116         }
 117
 118         /**
 119          * @return array
 120          */
 121         private function getData() {
 122                 if ( $this->data ) {
 123                         // @codeCoverageIgnoreStart
 124                         return $this->data;
 125                         // @codeCoverageIgnoreEnd
 126                 }
 127
 128                 $rl = $this->resourceLoader;
 129                 $data = [
 130                         'states' => [
 131                                 // moduleName => state
 132                         ],
 133                         'general' => [],
 134                         'styles' => [
 135                                 // moduleName
 136                         ],
 137                         'scripts' => [],
 138                         // Embedding for private modules
 139                         'embed' => [
 140                                 'styles' => [],
 141                                 'general' => [],
 142                         ],
 143
 144                 ];
 145
 146                 foreach ( $this->modules as $name ) {
 147                         $module = $rl->getModule( $name );
 148                         if ( !$module ) {
 149                                 continue;
 150                         }
 151
 152                         $group = $module->getGroup();
 153
 154                         if ( $group === 'private' ) {
 155                                 // Embed via mw.loader.implement per T36907.
 156                                 $data['embed']['general'][] = $name;
 157                                 // Avoid duplicate request from mw.loader
 158                                 $data['states'][$name] = 'loading';
 159                         } else {
 160                                 // Load via mw.loader.load()
 161                                 $data['general'][] = $name;
 162                         }
 163                 }
 164
 165                 foreach ( $this->moduleStyles as $name ) {
 166                         $module = $rl->getModule( $name );
 167                         if ( !$module ) {
 168                                 continue;
 169                         }
 170
 171                         if ( $module->getType() !== ResourceLoaderModule::LOAD_STYLES ) {
 172                                 $logger = $rl->getLogger();
 173                                 $logger->warning( 'Unexpected general module "{module}" in styles queue.', [
 174                                         'module' => $name,
 175                                 ] );
 176                         } else {
 177                                 // Stylesheet doesn't trigger mw.loader callback.
 178                                 // Set "ready" state to allow dependencies and avoid duplicate requests. (T87871)
 179                                 $data['states'][$name] = 'ready';
 180                         }
 181
 182                         $group = $module->getGroup();
 183                         $context = $this->getContext( $group, ResourceLoaderModule::TYPE_STYLES );
 184                         if ( $module->isKnownEmpty( $context ) ) {
 185                                 // Avoid needless request for empty module
 186                                 $data['states'][$name] = 'ready';
 187                         } else {
 188                                 if ( $group === 'private' ) {
 189                                         // Embed via style element
 190                                         $data['embed']['styles'][] = $name;
 191                                         // Avoid duplicate request from mw.loader
 192                                         $data['states'][$name] = 'ready';
 193                                 } else {
 194                                         // Load from load.php?only=styles via <link rel=stylesheet>
 195                                         $data['styles'][] = $name;
 196                                 }
 197                         }
 198                 }
 199
 200                 foreach ( $this->moduleScripts as $name ) {
 201                         $module = $rl->getModule( $name );
 202                         if ( !$module ) {
 203                                 continue;
 204                         }
 205
 206                         $group = $module->getGroup();
 207                         $context = $this->getContext( $group, ResourceLoaderModule::TYPE_SCRIPTS );
 208                         if ( $module->isKnownEmpty( $context ) ) {
 209                                 // Avoid needless request for empty module
 210                                 $data['states'][$name] = 'ready';
 211                         } else {
 212                                 // Load from load.php?only=scripts via <script src></script>
 213                                 $data['scripts'][] = $name;
 214
 215                                 // Avoid duplicate request from mw.loader
 216                                 $data['states'][$name] = 'loading';
 217                         }
 218                 }
 219
 220                 return $data;
 221         }
 222
 223         /**
 224          * @return array Attribute key-value pairs for the HTML document element
 225          */
 226         public function getDocumentAttributes() {
 227                 return [ 'class' => 'client-nojs' ];
 228         }
 229
 230         /**
 231          * The order of elements in the head is as follows:
 232          * - Inline scripts.
 233          * - Stylesheets.
 234          * - Async external script-src.
 235          *
 236          * Reasons:
 237          * - Script execution may be blocked on preceeding stylesheets.
 238          * - Async scripts are not blocked on stylesheets.
 239          * - Inline scripts can't be asynchronous.
 240          * - For styles, earlier is better.
 241          *
 242          * @return string|WrappedStringList HTML
 243          */
 244         public function getHeadHtml() {
 245                 $data = $this->getData();
 246                 $chunks = [];
 247
 248                 // Change "client-nojs" class to client-js. This allows easy toggling of UI components.
 249                 // This happens synchronously on every page view to avoid flashes of wrong content.
 250                 // See also #getDocumentAttributes() and /resources/src/startup.js.
 251                 $chunks[] = Html::inlineScript(
 252                         'document.documentElement.className = document.documentElement.className'
 253                         . '.replace( /(^|\s)client-nojs(\s|$)/, "$1client-js$2" );'
 254                 );
 255
 256                 // Inline RLQ: Set page variables
 257                 if ( $this->config ) {
 258                         $chunks[] = ResourceLoader::makeInlineScript(
 259                                 ResourceLoader::makeConfigSetScript( $this->config )
 260                         );
 261                 }
 262
 263                 // Inline RLQ: Initial module states
 264                 $states = array_merge( $this->exemptStates, $data['states'] );
 265                 if ( $states ) {
 266                         $chunks[] = ResourceLoader::makeInlineScript(
 267                                 ResourceLoader::makeLoaderStateScript( $states )
 268                         );
 269                 }
 270
 271                 // Inline RLQ: Embedded modules
 272                 if ( $data['embed']['general'] ) {
 273                         $chunks[] = $this->getLoad(
 274                                 $data['embed']['general'],
 275                                 ResourceLoaderModule::TYPE_COMBINED
 276                         );
 277                 }
 278
 279                 // Inline RLQ: Load general modules
 280                 if ( $data['general'] ) {
 281                         $chunks[] = ResourceLoader::makeInlineScript(
 282                                 Xml::encodeJsCall( 'mw.loader.load', [ $data['general'] ] )
 283                         );
 284                 }
 285
 286                 // Inline RLQ: Load only=scripts
 287                 if ( $data['scripts'] ) {
 288                         $chunks[] = $this->getLoad(
 289                                 $data['scripts'],
 290                                 ResourceLoaderModule::TYPE_SCRIPTS
 291                         );
 292                 }
 293
 294                 // External stylesheets
 295                 if ( $data['styles'] ) {
 296                         $chunks[] = $this->getLoad(
 297                                 $data['styles'],
 298                                 ResourceLoaderModule::TYPE_STYLES
 299                         );
 300                 }
 301
 302                 // Inline stylesheets (embedded only=styles)
 303                 if ( $data['embed']['styles'] ) {
 304                         $chunks[] = $this->getLoad(
 305                                 $data['embed']['styles'],
 306                                 ResourceLoaderModule::TYPE_STYLES
 307                         );
 308                 }
 309
 310                 // Async scripts. Once the startup is loaded, inline RLQ scripts will run.
 311                 // Pass-through a custom target from OutputPage (T143066).
 312                 $startupQuery = $this->target ? [ 'target' => $this->target ] : [];
 313                 $chunks[] = $this->getLoad(
 314                         'startup',
 315                         ResourceLoaderModule::TYPE_SCRIPTS,
 316                         $startupQuery
 317                 );
 318
 319                 return WrappedStringList::join( "\n", $chunks );
 320         }
 321
 322         /**
 323          * @return string|WrappedStringList HTML
 324          */
 325         public function getBodyHtml() {
 326                 return '';
 327         }
 328
 329         private function getContext( $group, $type ) {
 330                 return self::makeContext( $this->context, $group, $type );
 331         }
 332
 333         private function getLoad( $modules, $only, array $extraQuery = [] ) {
 334                 return self::makeLoad( $this->context, (array)$modules, $only, $extraQuery );
 335         }
 336
 337         private static function makeContext( ResourceLoaderContext $mainContext, $group, $type,
 338                 array $extraQuery = []
 339         ) {
 340                 // Create new ResourceLoaderContext so that $extraQuery may trigger isRaw().
 341                 $req = new FauxRequest( array_merge( $mainContext->getRequest()->getValues(), $extraQuery ) );
 342                 // Set 'only' if not combined
 343                 $req->setVal( 'only', $type === ResourceLoaderModule::TYPE_COMBINED ? null : $type );
 344                 // Remove user parameter in most cases
 345                 if ( $group !== 'user' && $group !== 'private' ) {
 346                         $req->setVal( 'user', null );
 347                 }
 348                 $context = new ResourceLoaderContext( $mainContext->getResourceLoader(), $req );
 349                 // Allow caller to setVersion() and setModules()
 350                 return new DerivativeResourceLoaderContext( $context );
 351         }
 352
 353         /**
 354          * Explicily load or embed modules on a page.
 355          *
 356          * @param ResourceLoaderContext $mainContext
 357          * @param array $modules One or more module names
 358          * @param string $only ResourceLoaderModule TYPE_ class constant
 359          * @param array $extraQuery [optional] Array with extra query parameters for the request
 360          * @return string|WrappedStringList HTML
 361          */
 362         public static function makeLoad( ResourceLoaderContext $mainContext, array $modules, $only,
 363                 array $extraQuery = []
 364         ) {
 365                 $rl = $mainContext->getResourceLoader();
 366                 $chunks = [];
 367
 368                 // Sort module names so requests are more uniform
 369                 sort( $modules );
 370
 371                 if ( $mainContext->getDebug() && count( $modules ) > 1 ) {
 372
 373                         $chunks = [];
 374                         // Recursively call us for every item
 375                         foreach ( $modules as $name ) {
 376                                 $chunks[] = self::makeLoad( $mainContext, [ $name ], $only, $extraQuery );
 377                         }
 378                         return new WrappedStringList( "\n", $chunks );
 379                 }
 380
 381                 // Create keyed-by-source and then keyed-by-group list of module objects from modules list
 382                 $sortedModules = [];
 383                 foreach ( $modules as $name ) {
 384                         $module = $rl->getModule( $name );
 385                         if ( !$module ) {
 386                                 $rl->getLogger()->warning( 'Unknown module "{module}"', [ 'module' => $name ] );
 387                                 continue;
 388                         }
 389                         $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module;
 390                 }
 391
 392                 foreach ( $sortedModules as $source => $groups ) {
 393                         foreach ( $groups as $group => $grpModules ) {
 394                                 $context = self::makeContext( $mainContext, $group, $only, $extraQuery );
 395                                 $context->setModules( array_keys( $grpModules ) );
 396
 397                                 if ( $group === 'private' ) {
 398                                         // Decide whether to use style or script element
 399                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
 400                                                 $chunks[] = Html::inlineStyle(
 401                                                         $rl->makeModuleResponse( $context, $grpModules )
 402                                                 );
 403                                         } else {
 404                                                 $chunks[] = ResourceLoader::makeInlineScript(
 405                                                         $rl->makeModuleResponse( $context, $grpModules )
 406                                                 );
 407                                         }
 408                                         continue;
 409                                 }
 410
 411                                 // See if we have one or more raw modules
 412                                 $isRaw = false;
 413                                 foreach ( $grpModules as $key => $module ) {
 414                                         $isRaw |= $module->isRaw();
 415                                 }
 416
 417                                 // Special handling for the user group; because users might change their stuff
 418                                 // on-wiki like user pages, or user preferences; we need to find the highest
 419                                 // timestamp of these user-changeable modules so we can ensure cache misses on change
 420                                 // This should NOT be done for the site group (T29564) because anons get that too
 421                                 // and we shouldn't be putting timestamps in CDN-cached HTML
 422                                 if ( $group === 'user' ) {
 423                                         // Must setModules() before makeVersionQuery()
 424                                         $context->setVersion( $rl->makeVersionQuery( $context ) );
 425                                 }
 426
 427                                 $url = $rl->createLoaderURL( $source, $context, $extraQuery );
 428
 429                                 // Decide whether to use 'style' or 'script' element
 430                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
 431                                         $chunk = Html::linkedStyle( $url );
 432                                 } else {
 433                                         if ( $context->getRaw() || $isRaw ) {
 434                                                 $chunk = Html::element( 'script', [
 435                                                         // In SpecialJavaScriptTest, QUnit must load synchronous
 436                                                         'async' => !isset( $extraQuery['sync'] ),
 437                                                         'src' => $url
 438                                                 ] );
 439                                         } else {
 440                                                 $chunk = ResourceLoader::makeInlineScript(
 441                                                         Xml::encodeJsCall( 'mw.loader.load', [ $url ] )
 442                                                 );
 443                                         }
 444                                 }
 445
 446                                 if ( $group == 'noscript' ) {
 447                                         $chunks[] = Html::rawElement( 'noscript', [], $chunk );
 448                                 } else {
 449                                         $chunks[] = $chunk;
 450                                 }
 451                         }
 452                 }
 453
 454                 return new WrappedStringList( "\n", $chunks );
 455         }
 456 }