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| 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 | namespace MediaWiki\ResourceLoader; |
| 22 | |
| 23 | use MediaWiki\Html\Html; |
| 24 | use Wikimedia\WrappedString; |
| 25 | use Wikimedia\WrappedStringList; |
| 26 | |
| 27 | /** |
| 28 | * Load and configure a ResourceLoader client on an HTML page. |
| 29 | * |
| 30 | * @ingroup ResourceLoader |
| 31 | * @since 1.28 |
| 32 | */ |
| 33 | class ClientHtml { |
| 34 | /** @var Context */ |
| 35 | private $context; |
| 36 | |
| 37 | /** @var ResourceLoader */ |
| 38 | private $resourceLoader; |
| 39 | |
| 40 | /** @var array<string,string|null|false> */ |
| 41 | private $options; |
| 42 | |
| 43 | /** @var array<string,mixed> */ |
| 44 | private $config = []; |
| 45 | |
| 46 | /** @var string[] */ |
| 47 | private $modules = []; |
| 48 | |
| 49 | /** @var string[] */ |
| 50 | private $moduleStyles = []; |
| 51 | |
| 52 | /** @var array<string,string> */ |
| 53 | private $exemptStates = []; |
| 54 | |
| 55 | /** @var array */ |
| 56 | private $data; |
| 57 | |
| 58 | /** |
| 59 | * @param Context $context |
| 60 | * @param array $options [optional] Array of options |
| 61 | * - 'target': Parameter for modules=startup request, see StartUpModule. |
| 62 | * - 'safemode': Parameter for modules=startup request, see StartUpModule. |
| 63 | * - 'clientPrefEnabled': See Skin options. |
| 64 | * - 'clientPrefCookiePrefix': See $wgCookiePrefix. |
| 65 | */ |
| 66 | public function __construct( Context $context, array $options = [] ) { |
| 67 | $this->context = $context; |
| 68 | $this->resourceLoader = $context->getResourceLoader(); |
| 69 | $this->options = $options + [ |
| 70 | 'target' => null, |
| 71 | 'safemode' => null, |
| 72 | 'clientPrefEnabled' => false, |
| 73 | 'clientPrefCookiePrefix' => '', |
| 74 | ]; |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Set mw.config variables. |
| 79 | * |
| 80 | * @param array $vars Array of key/value pairs |
| 81 | */ |
| 82 | public function setConfig( array $vars ): void { |
| 83 | foreach ( $vars as $key => $value ) { |
| 84 | $this->config[$key] = $value; |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Ensure one or more modules are loaded. |
| 90 | * |
| 91 | * @param string[] $modules Array of module names |
| 92 | */ |
| 93 | public function setModules( array $modules ): void { |
| 94 | $this->modules = $modules; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Ensure the styles of one or more modules are loaded. |
| 99 | * |
| 100 | * @param string[] $modules Array of module names |
| 101 | */ |
| 102 | public function setModuleStyles( array $modules ): void { |
| 103 | $this->moduleStyles = $modules; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Set state of special modules that are handled by the caller manually. |
| 108 | * |
| 109 | * See OutputPage::buildExemptModules() for use cases. |
| 110 | * |
| 111 | * @param array<string,string> $states Module state keyed by module name |
| 112 | */ |
| 113 | public function setExemptStates( array $states ): void { |
| 114 | $this->exemptStates = $states; |
| 115 | } |
| 116 | |
| 117 | private function getData(): array { |
| 118 | if ( $this->data ) { |
| 119 | return $this->data; |
| 120 | } |
| 121 | |
| 122 | $rl = $this->resourceLoader; |
| 123 | $data = [ |
| 124 | 'states' => [ |
| 125 | // moduleName => state |
| 126 | ], |
| 127 | 'general' => [], |
| 128 | 'styles' => [], |
| 129 | // Embedding for private modules |
| 130 | 'embed' => [ |
| 131 | 'styles' => [], |
| 132 | 'general' => [], |
| 133 | ], |
| 134 | // Deprecation warnings for style-only modules |
| 135 | 'styleDeprecations' => [], |
| 136 | ]; |
| 137 | |
| 138 | foreach ( $this->modules as $name ) { |
| 139 | $module = $rl->getModule( $name ); |
| 140 | if ( !$module ) { |
| 141 | continue; |
| 142 | } |
| 143 | |
| 144 | $group = $module->getGroup(); |
| 145 | $context = $this->getContext( $group, Module::TYPE_COMBINED ); |
| 146 | $shouldEmbed = $module->shouldEmbedModule( $this->context ); |
| 147 | |
| 148 | if ( ( $group === Module::GROUP_USER || $shouldEmbed ) && |
| 149 | $module->isKnownEmpty( $context ) ) { |
| 150 | // This is a user-specific or embedded module, which means its output |
| 151 | // can be specific to the current page or user. As such, we can optimise |
| 152 | // the way we load it based on the current version of the module. |
| 153 | // Avoid needless embed for empty module, preset ready state. |
| 154 | $data['states'][$name] = 'ready'; |
| 155 | } elseif ( $group === Module::GROUP_USER || $shouldEmbed ) { |
| 156 | // - For group=user: We need to provide a pre-generated load.php |
| 157 | // url to the client that has the 'user' and 'version' parameters |
| 158 | // filled in. Without this, the client would wrongly use the static |
| 159 | // version hash, per T64602. |
| 160 | // - For shouldEmbed=true: Embed via mw.loader.impl, per T36907. |
| 161 | $data['embed']['general'][] = $name; |
| 162 | // Avoid duplicate request from mw.loader |
| 163 | $data['states'][$name] = 'loading'; |
| 164 | } else { |
| 165 | // Load via mw.loader.load() |
| 166 | $data['general'][] = $name; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | foreach ( $this->moduleStyles as $name ) { |
| 171 | $module = $rl->getModule( $name ); |
| 172 | if ( !$module ) { |
| 173 | continue; |
| 174 | } |
| 175 | |
| 176 | if ( $module->getType() !== Module::LOAD_STYLES ) { |
| 177 | $logger = $rl->getLogger(); |
| 178 | $logger->error( 'Unexpected general module "{module}" in styles queue.', [ |
| 179 | 'module' => $name, |
| 180 | ] ); |
| 181 | continue; |
| 182 | } |
| 183 | |
| 184 | // Stylesheet doesn't trigger mw.loader callback. |
| 185 | // Set "ready" state to allow script modules to depend on this module (T87871). |
| 186 | // And to avoid duplicate requests at run-time from mw.loader. |
| 187 | // |
| 188 | // Optimization: Exclude state for "noscript" modules. Since these are also excluded |
| 189 | // from the startup registry, no need to send their states (T291735). |
| 190 | $group = $module->getGroup(); |
| 191 | if ( $group !== Module::GROUP_NOSCRIPT ) { |
| 192 | $data['states'][$name] = 'ready'; |
| 193 | } |
| 194 | |
| 195 | $context = $this->getContext( $group, Module::TYPE_STYLES ); |
| 196 | if ( $module->shouldEmbedModule( $this->context ) ) { |
| 197 | // Avoid needless embed for private embeds we know are empty. |
| 198 | // (Set "ready" state directly instead, which we do a few lines above.) |
| 199 | if ( !$module->isKnownEmpty( $context ) ) { |
| 200 | // Embed via <style> element |
| 201 | $data['embed']['styles'][] = $name; |
| 202 | } |
| 203 | // For other style modules, always request them, regardless of whether they are |
| 204 | // currently known to be empty. Because: |
| 205 | // 1. Those modules are requested in batch, so there is no extra request overhead |
| 206 | // or extra HTML element to be avoided. |
| 207 | // 2. Checking isKnownEmpty for those can be expensive and slow down page view |
| 208 | // generation (T230260). |
| 209 | // 3. We don't want cached HTML to vary on the current state of a module. |
| 210 | // If the module becomes non-empty a few minutes later, it should start working |
| 211 | // on cached HTML without requiring a purge. |
| 212 | // |
| 213 | // But, user-specific modules: |
| 214 | // * ... are used on page views not publicly cached. |
| 215 | // * ... are in their own group and thus a require a request we can avoid |
| 216 | // * ... have known-empty status preloaded by ResourceLoader. |
| 217 | } elseif ( $group !== Module::GROUP_USER || !$module->isKnownEmpty( $context ) ) { |
| 218 | // Load from load.php?only=styles via <link rel=stylesheet> |
| 219 | $data['styles'][] = $name; |
| 220 | } |
| 221 | $deprecation = $module->getDeprecationWarning(); |
| 222 | if ( $deprecation ) { |
| 223 | $data['styleDeprecations'][] = $deprecation; |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | $this->data = $data; |
| 228 | |
| 229 | return $this->data; |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * @return array<string,string> Attributes pairs for the HTML document element |
| 234 | */ |
| 235 | public function getDocumentAttributes() { |
| 236 | return [ 'class' => 'client-nojs' ]; |
| 237 | } |
| 238 | |
| 239 | /** |
| 240 | * Set relevant classes on document.documentElement |
| 241 | * |
| 242 | * @param string|null $nojsClass Class name that Skin will set on HTML document |
| 243 | * @return string |
| 244 | */ |
| 245 | private function getDocumentClassNameScript( $nojsClass ) { |
| 246 | // Change "client-nojs" to "client-js". |
| 247 | // This enables server rendering of UI components, even for those that should be hidden |
| 248 | // in Grade C where JavaScript is unsupported, whilst avoiding a flash of wrong content. |
| 249 | // |
| 250 | // See also Skin:getHtmlElementAttributes() and startup/startup.js. |
| 251 | // |
| 252 | // Optimisation: Produce shorter and faster JS by only writing to DOM. |
| 253 | // This is possible because Skin informs RL about the final value of <html class>, and |
| 254 | // because RL already controls the first element in HTML <head> for performance reasons. |
| 255 | // - Avoid reading HTMLElement.className |
| 256 | // - Avoid executing JS regexes in the common case, by doing the string replace in PHP. |
| 257 | $nojsClass ??= $this->getDocumentAttributes()['class']; |
| 258 | $jsClass = preg_replace( '/(^|\s)client-nojs(\s|$)/', '$1client-js$2', $nojsClass ); |
| 259 | $jsClassJson = $this->context->encodeJson( $jsClass ); |
| 260 | |
| 261 | // Apply client preferences stored by mw.user.clientPrefs as "class1,class2", where each |
| 262 | // item is an <html> class following the pattern "<key>-clientpref-<value>" (T339268) |
| 263 | if ( $this->options['clientPrefEnabled'] ) { |
| 264 | $cookiePrefix = $this->options['clientPrefCookiePrefix']; |
| 265 | $script = strtr( |
| 266 | file_get_contents( MW_INSTALL_PATH . '/resources/src/startup/clientprefs.js' ), |
| 267 | [ |
| 268 | '$VARS.jsClass' => $jsClassJson, |
| 269 | '__COOKIE_PREFIX__' => $cookiePrefix, |
| 270 | ] |
| 271 | ); |
| 272 | } else { |
| 273 | $script = "document.documentElement.className = {$jsClassJson};"; |
| 274 | } |
| 275 | |
| 276 | return $script; |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * The order of elements in the head is as follows: |
| 281 | * - Inline scripts. |
| 282 | * - Stylesheets. |
| 283 | * - Async external script-src. |
| 284 | * |
| 285 | * Reasons: |
| 286 | * - Script execution may be blocked on preceding stylesheets. |
| 287 | * - Async scripts are not blocked on stylesheets. |
| 288 | * - Inline scripts can't be asynchronous. |
| 289 | * - For styles, earlier is better. |
| 290 | * |
| 291 | * @param string|null $nojsClass Class name that caller uses on HTML document element |
| 292 | * @return string|WrappedStringList HTML |
| 293 | */ |
| 294 | public function getHeadHtml( $nojsClass = null ) { |
| 295 | $script = $this->getDocumentClassNameScript( $nojsClass ); |
| 296 | |
| 297 | // Inline script: Declare mw.config variables for this page. |
| 298 | if ( $this->config ) { |
| 299 | $confJson = $this->context->encodeJson( $this->config ); |
| 300 | $script .= " |
| 301 | RLCONF = {$confJson}; |
| 302 | "; |
| 303 | } |
| 304 | |
| 305 | $data = $this->getData(); |
| 306 | |
| 307 | // Inline script: Declare initial module states for this page. |
| 308 | $states = array_merge( $this->exemptStates, $data['states'] ); |
| 309 | if ( $states ) { |
| 310 | $stateJson = $this->context->encodeJson( $states ); |
| 311 | $script .= " |
| 312 | RLSTATE = {$stateJson}; |
| 313 | "; |
| 314 | } |
| 315 | |
| 316 | // Inline script: Declare general modules to load on this page. |
| 317 | if ( $data['general'] ) { |
| 318 | $pageModulesJson = $this->context->encodeJson( $data['general'] ); |
| 319 | $script .= " |
| 320 | RLPAGEMODULES = {$pageModulesJson}; |
| 321 | "; |
| 322 | } |
| 323 | |
| 324 | if ( !$this->context->getDebug() ) { |
| 325 | $script = ResourceLoader::filter( 'minify-js', $script, [ 'cache' => false ] ); |
| 326 | } |
| 327 | |
| 328 | $chunks = []; |
| 329 | $chunks[] = Html::inlineScript( $script ); |
| 330 | |
| 331 | // Inline RLQ: Embedded modules |
| 332 | if ( $data['embed']['general'] ) { |
| 333 | $chunks[] = $this->getLoad( |
| 334 | $data['embed']['general'], |
| 335 | Module::TYPE_COMBINED |
| 336 | ); |
| 337 | } |
| 338 | |
| 339 | // External stylesheets (only=styles) |
| 340 | if ( $data['styles'] ) { |
| 341 | $chunks[] = $this->getLoad( |
| 342 | $data['styles'], |
| 343 | Module::TYPE_STYLES |
| 344 | ); |
| 345 | } |
| 346 | |
| 347 | // Inline stylesheets (embedded only=styles) |
| 348 | if ( $data['embed']['styles'] ) { |
| 349 | $chunks[] = $this->getLoad( |
| 350 | $data['embed']['styles'], |
| 351 | Module::TYPE_STYLES |
| 352 | ); |
| 353 | } |
| 354 | |
| 355 | // Async scripts. Once the startup is loaded, inline RLQ scripts will run. |
| 356 | // Pass-through a custom 'target' from OutputPage (T143066). |
| 357 | $startupQuery = [ 'raw' => '1' ]; |
| 358 | foreach ( [ 'target', 'safemode' ] as $param ) { |
| 359 | if ( $this->options[$param] !== null ) { |
| 360 | $startupQuery[$param] = (string)$this->options[$param]; |
| 361 | } |
| 362 | } |
| 363 | $chunks[] = $this->getLoad( |
| 364 | 'startup', |
| 365 | Module::TYPE_SCRIPTS, |
| 366 | $startupQuery |
| 367 | ); |
| 368 | |
| 369 | return WrappedString::join( "\n", $chunks ); |
| 370 | } |
| 371 | |
| 372 | /** |
| 373 | * @return string|WrappedStringList HTML |
| 374 | */ |
| 375 | public function getBodyHtml() { |
| 376 | $data = $this->getData(); |
| 377 | $chunks = []; |
| 378 | |
| 379 | // Deprecations for only=styles modules |
| 380 | if ( $data['styleDeprecations'] ) { |
| 381 | $calls = ''; |
| 382 | foreach ( $data['styleDeprecations'] as $warning ) { |
| 383 | $calls .= Html::encodeJsCall( 'mw.log.warn', [ $warning ] ); |
| 384 | } |
| 385 | $chunks[] = ResourceLoader::makeInlineScript( $calls ); |
| 386 | } |
| 387 | |
| 388 | return WrappedString::join( "\n", $chunks ); |
| 389 | } |
| 390 | |
| 391 | private function getContext( $group, $type ): Context { |
| 392 | return self::makeContext( $this->context, $group, $type ); |
| 393 | } |
| 394 | |
| 395 | private function getLoad( $modules, $only, array $extraQuery = [] ) { |
| 396 | return self::makeLoad( $this->context, (array)$modules, $only, $extraQuery ); |
| 397 | } |
| 398 | |
| 399 | private static function makeContext( Context $mainContext, $group, $type, |
| 400 | array $extraQuery = [] |
| 401 | ): DerivativeContext { |
| 402 | // Allow caller to setVersion() and setModules() |
| 403 | $ret = new DerivativeContext( $mainContext ); |
| 404 | // Set 'only' if not combined |
| 405 | $ret->setOnly( $type === Module::TYPE_COMBINED ? null : $type ); |
| 406 | // Remove user parameter in most cases |
| 407 | if ( $group !== Module::GROUP_USER && $group !== Module::GROUP_PRIVATE ) { |
| 408 | $ret->setUser( null ); |
| 409 | } |
| 410 | if ( isset( $extraQuery['raw'] ) ) { |
| 411 | $ret->setRaw( true ); |
| 412 | } |
| 413 | return $ret; |
| 414 | } |
| 415 | |
| 416 | /** |
| 417 | * Explicitly load or embed modules on a page. |
| 418 | * |
| 419 | * @param Context $mainContext |
| 420 | * @param string[] $modules One or more module names |
| 421 | * @param string $only Module TYPE_ class constant |
| 422 | * @param array $extraQuery [optional] Array with extra query parameters for the request |
| 423 | * @return string|WrappedStringList HTML |
| 424 | */ |
| 425 | public static function makeLoad( Context $mainContext, array $modules, $only, |
| 426 | array $extraQuery = [] |
| 427 | ) { |
| 428 | $rl = $mainContext->getResourceLoader(); |
| 429 | $chunks = []; |
| 430 | |
| 431 | // Sort module names so requests are more uniform |
| 432 | sort( $modules ); |
| 433 | |
| 434 | if ( $mainContext->getDebug() && count( $modules ) > 1 ) { |
| 435 | // Recursively call us for every item |
| 436 | foreach ( $modules as $name ) { |
| 437 | $chunks[] = self::makeLoad( $mainContext, [ $name ], $only, $extraQuery ); |
| 438 | } |
| 439 | return new WrappedStringList( "\n", $chunks ); |
| 440 | } |
| 441 | |
| 442 | // Create keyed-by-source and then keyed-by-group list of module objects from modules list |
| 443 | $sortedModules = []; |
| 444 | foreach ( $modules as $name ) { |
| 445 | $module = $rl->getModule( $name ); |
| 446 | if ( !$module ) { |
| 447 | $rl->getLogger()->warning( 'Unknown module "{module}"', [ 'module' => $name ] ); |
| 448 | continue; |
| 449 | } |
| 450 | $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module; |
| 451 | } |
| 452 | |
| 453 | foreach ( $sortedModules as $source => $groups ) { |
| 454 | foreach ( $groups as $group => $grpModules ) { |
| 455 | $context = self::makeContext( $mainContext, $group, $only, $extraQuery ); |
| 456 | |
| 457 | // Separate sets of linked and embedded modules while preserving order |
| 458 | $moduleSets = []; |
| 459 | $idx = -1; |
| 460 | foreach ( $grpModules as $name => $module ) { |
| 461 | $shouldEmbed = $module->shouldEmbedModule( $context ); |
| 462 | if ( !$moduleSets || $moduleSets[$idx][0] !== $shouldEmbed ) { |
| 463 | $moduleSets[++$idx] = [ $shouldEmbed, [] ]; |
| 464 | } |
| 465 | $moduleSets[$idx][1][$name] = $module; |
| 466 | } |
| 467 | |
| 468 | // Link/embed each set |
| 469 | foreach ( $moduleSets as [ $embed, $moduleSet ] ) { |
| 470 | $moduleSetNames = array_keys( $moduleSet ); |
| 471 | $context->setModules( $moduleSetNames ); |
| 472 | if ( $embed ) { |
| 473 | $response = $rl->makeModuleResponse( $context, $moduleSet ); |
| 474 | // Decide whether to use style or script element |
| 475 | if ( $only == Module::TYPE_STYLES ) { |
| 476 | $chunks[] = Html::inlineStyle( $response ); |
| 477 | } else { |
| 478 | $chunks[] = ResourceLoader::makeInlineScript( $response ); |
| 479 | } |
| 480 | } else { |
| 481 | // Not embedded |
| 482 | |
| 483 | // Special handling for the user group; because users might change their stuff |
| 484 | // on-wiki like user pages, or user preferences; we need to find the highest |
| 485 | // timestamp of these user-changeable modules so we can ensure cache misses on change |
| 486 | // This should NOT be done for the site group (T29564) because anons get that too |
| 487 | // and we shouldn't be putting timestamps in CDN-cached HTML |
| 488 | if ( $group === Module::GROUP_USER ) { |
| 489 | $context->setVersion( $rl->makeVersionQuery( $context, $moduleSetNames ) ); |
| 490 | } |
| 491 | |
| 492 | // Must setModules() before createLoaderURL() |
| 493 | $url = $rl->createLoaderURL( $source, $context, $extraQuery ); |
| 494 | |
| 495 | // Decide whether to use 'style' or 'script' element |
| 496 | if ( $only === Module::TYPE_STYLES ) { |
| 497 | $chunk = Html::linkedStyle( $url ); |
| 498 | } elseif ( $context->getRaw() ) { |
| 499 | // This request is asking for the module to be delivered standalone, |
| 500 | // (aka "raw") without communicating to any mw.loader client. |
| 501 | // For: |
| 502 | // - startup (naturally because this is what will define mw.loader) |
| 503 | $chunk = Html::element( 'script', [ |
| 504 | 'async' => true, |
| 505 | 'src' => $url, |
| 506 | ] ); |
| 507 | } else { |
| 508 | $chunk = ResourceLoader::makeInlineScript( |
| 509 | 'mw.loader.load(' . $mainContext->encodeJson( $url ) . ');' |
| 510 | ); |
| 511 | } |
| 512 | |
| 513 | if ( $group == Module::GROUP_NOSCRIPT ) { |
| 514 | $chunks[] = Html::rawElement( 'noscript', [], $chunk ); |
| 515 | } else { |
| 516 | $chunks[] = $chunk; |
| 517 | } |
| 518 | } |
| 519 | } |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | return new WrappedStringList( "\n", $chunks ); |
| 524 | } |
| 525 | } |