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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @author Trevor Parscal
* @author Roan Kattouw
*/
namespace MediaWiki\ResourceLoader;
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\MediaWikiServices;
use MediaWiki\Message\Message;
use MediaWiki\Page\PageReferenceValue;
use MediaWiki\Request\FauxRequest;
use MediaWiki\Request\WebRequest;
use MediaWiki\User\User;
use MediaWiki\User\UserIdentity;
use MediaWiki\User\UserRigorOptions;
use MessageLocalizer;
use Psr\Log\LoggerInterface;
use Wikimedia\Message\MessageParam;
use Wikimedia\Message\MessageSpecifier;
/**
* Context object that contains information about the state of a specific
* ResourceLoader web request. Passed around to Module methods.
*
* @ingroup ResourceLoader
* @since 1.17
*/
class Context implements MessageLocalizer {
public const DEFAULT_LANG = 'qqx';
public const DEFAULT_SKIN = 'fallback';
/** @internal For use in ResourceLoader classes. */
public const DEBUG_OFF = 0;
/** @internal For use in SpecialJavaScriptTest. */
public const DEBUG_MAIN = 2;
/** @var ResourceLoader */
protected $resourceLoader;
/** @var WebRequest */
protected $request;
/** @var LoggerInterface */
protected $logger;
// Module content vary
/** @var string */
protected $skin;
/** @var string */
protected $language;
/** @var int */
protected $debug;
/** @var string|null */
protected $user;
// Request vary (in addition to cache vary)
/** @var string[] */
protected $modules;
/** @var string|null */
protected $only;
/** @var string|null */
protected $version;
/** @var bool */
protected $raw;
/** @var bool */
protected $sourcemap;
/** @var string|null */
protected $image;
/** @var string|null */
protected $variant;
/** @var string|null */
protected $format;
/** @var string|null */
protected $direction;
/** @var string|null */
protected $hash;
/** @var User|null */
protected $userObj;
/** @var UserIdentity|null|false */
protected $userIdentity = false;
/** @var Image|false */
protected $imageObj;
/**
* @param ResourceLoader $resourceLoader
* @param WebRequest $request
* @param string[]|null $validSkins List of valid skin names. If not passed,
* any skin name is considered valid. Invalid skins are replaced by the default.
*/
public function __construct(
ResourceLoader $resourceLoader, WebRequest $request, $validSkins = null
) {
$this->resourceLoader = $resourceLoader;
$this->request = $request;
$this->logger = $resourceLoader->getLogger();
// Optimisation: Use WebRequest::getRawVal() instead of getVal(). We don't
// need the slow Language+UTF logic meant for user input here. (f303bb9360)
// List of modules
$modules = $request->getRawVal( 'modules' );
$this->modules = $modules ? ResourceLoader::expandModuleNames( $modules ) : [];
// Various parameters
$this->user = $request->getRawVal( 'user' );
$this->debug = self::debugFromString( $request->getRawVal( 'debug' ) );
$this->only = $request->getRawVal( 'only' );
$this->version = $request->getRawVal( 'version' );
$this->raw = $request->getFuzzyBool( 'raw' );
$this->sourcemap = $request->getFuzzyBool( 'sourcemap' );
// Image requests
$this->image = $request->getRawVal( 'image' );
$this->variant = $request->getRawVal( 'variant' );
$this->format = $request->getRawVal( 'format' );
$skin = $request->getRawVal( 'skin' );
if (
$skin === null
|| ( is_array( $validSkins ) && !in_array( $skin, $validSkins ) )
) {
// For requests without a known skin specified,
// use MediaWiki's 'fallback' skin for any skin-specific decisions.
$skin = self::DEFAULT_SKIN;
}
$this->skin = $skin;
}
/**
* @internal For use in ResourceLoader::inDebugMode
* @param string|null $debug
* @return int
*/
public static function debugFromString( ?string $debug ): int {
// The canonical way to enable debug mode is via debug=true
if ( $debug === 'true' || $debug === '2' ) {
$ret = self::DEBUG_MAIN;
} else {
$ret = self::DEBUG_OFF;
}
return $ret;
}
/**
* Return a dummy Context object suitable for passing into
* things that don't "really" need a context.
*
* Use cases:
* - Unit tests (deprecated, create empty instance directly or use RLTestCase).
*/
public static function newDummyContext(): Context {
// This currently creates a non-empty instance of ResourceLoader (all modules registered),
// but that's probably not needed. So once that moves into ServiceWiring, this'll
// become more like the EmptyResourceLoader class we have in PHPUnit tests, which
// is what this should've had originally. If this turns out to be untrue, change to:
// `MediaWikiServices::getInstance()->getResourceLoader()` instead.
return new self( new ResourceLoader(
MediaWikiServices::getInstance()->getMainConfig(),
LoggerFactory::getInstance( 'resourceloader' )
), new FauxRequest( [] ) );
}
public function getResourceLoader(): ResourceLoader {
return $this->resourceLoader;
}
public function getRequest(): WebRequest {
return $this->request;
}
/**
* @deprecated since 1.34 Use Module::getLogger instead
* inside module methods. Use ResourceLoader::getLogger elsewhere.
* @since 1.27
* @return LoggerInterface
*/
public function getLogger() {
return $this->logger;
}
public function getModules(): array {
return $this->modules;
}
public function getLanguage(): string {
if ( $this->language === null ) {
// Must be a valid language code after this point (T64849)
// Only support uselang values that follow built-in conventions (T102058)
$lang = $this->getRequest()->getRawVal( 'lang' ) ?? '';
// Stricter version of RequestContext::sanitizeLangCode()
$validBuiltinCode = MediaWikiServices::getInstance()->getLanguageNameUtils()
->isValidBuiltInCode( $lang );
if ( !$validBuiltinCode ) {
// The 'lang' parameter is required. (Not yet enforced.)
// If omitted, localise with the dummy language code.
$lang = self::DEFAULT_LANG;
}
$this->language = $lang;
}
return $this->language;
}
public function getDirection(): string {
if ( $this->direction === null ) {
// Determine directionality based on user language (T8100)
$this->direction = MediaWikiServices::getInstance()->getLanguageFactory()
->getLanguage( $this->getLanguage() )->getDir();
}
return $this->direction;
}
public function getSkin(): string {
return $this->skin;
}
public function getUser(): ?string {
return $this->user;
}
/**
* Get a Message object with context set. See wfMessage for parameters.
*
* @since 1.27
* @param string|string[]|MessageSpecifier $key Message key, or array of keys,
* or a MessageSpecifier.
* @phpcs:ignore Generic.Files.LineLength
* @param MessageParam|MessageSpecifier|string|int|float|list<MessageParam|MessageSpecifier|string|int|float> ...$params
* See Message::params()
* @return Message
*/
public function msg( $key, ...$params ): Message {
return wfMessage( $key, ...$params )
// Do not use MediaWiki user language from session. Use the provided one instead.
->inLanguage( $this->getLanguage() )
// inLanguage() clears the interface flag, so we need re-enable it. (T291601)
->setInterfaceMessageFlag( true )
// Use a dummy title because there is no real title for this endpoint, and the cache won't
// vary on it anyways.
->page( PageReferenceValue::localReference( NS_SPECIAL, 'Badtitle/ResourceLoaderContext' ) );
}
/**
* Get the possibly-cached UserIdentity object for the specified username
*
* This will be null on most requests,
* except for load.php requests that have a 'user' parameter set.
*
* @since 1.38
* @return UserIdentity|null
*/
public function getUserIdentity(): ?UserIdentity {
if ( $this->userIdentity === false ) {
$username = $this->getUser();
if ( $username === null ) {
// Anonymous user
$this->userIdentity = null;
} else {
// Use provided username if valid
$this->userIdentity = MediaWikiServices::getInstance()
->getUserFactory()
->newFromName( $username, UserRigorOptions::RIGOR_VALID );
}
}
return $this->userIdentity;
}
/**
* Get the possibly-cached User object for the specified username
*
* @since 1.25
* @return User
*/
public function getUserObj(): User {
if ( $this->userObj === null ) {
$username = $this->getUser();
$userFactory = MediaWikiServices::getInstance()->getUserFactory();
if ( $username ) {
// Use provided username if valid, fallback to anonymous user
$this->userObj = $userFactory->newFromName( $username, UserRigorOptions::RIGOR_VALID );
}
// Anonymous user
$this->userObj ??= $userFactory->newAnonymous();
}
return $this->userObj;
}
public function getDebug(): int {
return $this->debug;
}
public function getOnly(): ?string {
return $this->only;
}
/**
* @see Module::getVersionHash
* @see ClientHtml::makeLoad
* @return string|null
*/
public function getVersion(): ?string {
return $this->version;
}
public function getRaw(): bool {
return $this->raw;
}
/**
* @since 1.41
* @return bool
*/
public function isSourceMap(): bool {
return $this->sourcemap;
}
public function getImage(): ?string {
return $this->image;
}
public function getVariant(): ?string {
return $this->variant;
}
public function getFormat(): ?string {
return $this->format;
}
/**
* If this is a request for an image, get the Image object.
*
* @since 1.25
* @return Image|false false if a valid object cannot be created
*/
public function getImageObj() {
if ( $this->imageObj === null ) {
$this->imageObj = false;
if ( !$this->image ) {
return $this->imageObj;
}
$modules = $this->getModules();
if ( count( $modules ) !== 1 ) {
return $this->imageObj;
}
$module = $this->getResourceLoader()->getModule( $modules[0] );
if ( !$module || !$module instanceof ImageModule ) {
return $this->imageObj;
}
$image = $module->getImage( $this->image, $this );
if ( !$image ) {
return $this->imageObj;
}
$this->imageObj = $image;
}
return $this->imageObj;
}
/**
* Return the replaced-content mapping callback
*
* When editing a page that's used to generate the scripts or styles of a
* WikiModule, a preview should use the to-be-saved version of
* the page rather than the current version in the database. A context
* supporting such previews should return a callback to return these
* mappings here.
*
* @since 1.32
* @return callable|null Signature is `Content|null func( Title $t )`
*/
public function getContentOverrideCallback() {
return null;
}
public function shouldIncludeScripts(): bool {
return $this->getOnly() === null || $this->getOnly() === 'scripts';
}
public function shouldIncludeStyles(): bool {
return $this->getOnly() === null || $this->getOnly() === 'styles';
}
public function shouldIncludeMessages(): bool {
return $this->getOnly() === null;
}
/**
* All factors that uniquely identify this request, except 'modules'.
*
* The list of modules is excluded here for legacy reasons as most callers already
* split up handling of individual modules. Including it here would massively fragment
* the cache and decrease its usefulness.
*
* E.g. Used by RequestFileCache to form a cache key for storing the response output.
*/
public function getHash(): string {
if ( $this->hash === null ) {
$this->hash = implode( '|', [
// Module content vary
$this->getLanguage(),
$this->getSkin(),
(string)$this->getDebug(),
$this->getUser() ?? '',
// Request vary
$this->getOnly() ?? '',
$this->getVersion() ?? '',
(string)$this->getRaw(),
$this->getImage() ?? '',
$this->getVariant() ?? '',
$this->getFormat() ?? '',
] );
}
return $this->hash;
}
/**
* Get the request base parameters, omitting any defaults.
*
* @internal For use by StartUpModule only
* @return string[]
*/
public function getReqBase(): array {
$reqBase = [];
$lang = $this->getLanguage();
if ( $lang !== self::DEFAULT_LANG ) {
$reqBase['lang'] = $lang;
}
$skin = $this->getSkin();
if ( $skin !== self::DEFAULT_SKIN ) {
$reqBase['skin'] = $skin;
}
$debug = $this->getDebug();
if ( $debug !== self::DEBUG_OFF ) {
$reqBase['debug'] = strval( $debug );
}
return $reqBase;
}
/**
* Wrapper around json_encode that avoids needless escapes,
* and pretty-prints in debug mode.
*
* @since 1.34
* @param mixed $data
* @return string|false JSON string, false on error
*/
public function encodeJson( $data ) {
// Keep output as small as possible by disabling needless escape modes
// that PHP uses by default.
// However, while most module scripts are only served on HTTP responses
// for JavaScript, some modules can also be embedded in the HTML as inline
// scripts. This, and the fact that we sometimes need to export strings
// containing user-generated content and labels that may genuinely contain
// a sequences like "</script>", we need to encode either '/' or '<'.
// By default PHP escapes '/'. Let's escape '<' instead which is less common
// and allows URLs to mostly remain readable.
$jsonFlags = JSON_UNESCAPED_SLASHES |
JSON_UNESCAPED_UNICODE |
JSON_PARTIAL_OUTPUT_ON_ERROR |
JSON_HEX_TAG |
JSON_HEX_AMP;
if ( $this->getDebug() ) {
$jsonFlags |= JSON_PRETTY_PRINT;
}
$json = json_encode( $data, $jsonFlags );
if ( json_last_error() !== JSON_ERROR_NONE ) {
trigger_error( __METHOD__ . ' partially failed: ' . json_last_error_msg(), E_USER_WARNING );
}
return $json;
}
}