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ApiMain.php
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<?php
/**
* Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
*
* 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
* @defgroup API API
*/
namespace MediaWiki\Api;
use ILocalizedException;
use LogicException;
use MediaWiki;
use MediaWiki\Api\Validator\ApiParamValidator;
use MediaWiki\Context\DerivativeContext;
use MediaWiki\Context\IContextSource;
use MediaWiki\Context\RequestContext;
use MediaWiki\Debug\MWDebug;
use MediaWiki\Html\Html;
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Message\Message;
use MediaWiki\ParamValidator\TypeDef\UserDef;
use MediaWiki\Profiler\ProfilingContext;
use MediaWiki\Request\FauxRequest;
use MediaWiki\Request\WebRequest;
use MediaWiki\Request\WebRequestUpload;
use MediaWiki\Rest\HeaderParser\Origin;
use MediaWiki\Session\SessionManager;
use MediaWiki\StubObject\StubGlobalUser;
use MediaWiki\User\UserRigorOptions;
use MediaWiki\Utils\MWTimestamp;
use MediaWiki\WikiMap\WikiMap;
use MWExceptionHandler;
use MWExceptionRenderer;
use Profiler;
use Throwable;
use UnexpectedValueException;
use Wikimedia\AtEase\AtEase;
use Wikimedia\Message\MessageSpecifier;
use Wikimedia\ParamValidator\ParamValidator;
use Wikimedia\ParamValidator\TypeDef\IntegerDef;
use Wikimedia\Stats\StatsFactory;
use Wikimedia\Timestamp\TimestampException;
/**
* This is the main API class, used for both external and internal processing.
* When executed, it will create the requested formatter object,
* instantiate and execute an object associated with the needed action,
* and use formatter to print results.
* In case of an exception, an error message will be printed using the same formatter.
*
* To use API from another application, run it using MediaWiki\Request\FauxRequest object, in which
* case any internal exceptions will not be handled but passed up to the caller.
* After successful execution, use getResult() for the resulting data.
*
* @newable
* @note marked as newable in 1.35 for lack of a better alternative,
* but should use a factory in the future.
* @ingroup API
*/
class ApiMain extends ApiBase {
/**
* When no format parameter is given, this format will be used
*/
private const API_DEFAULT_FORMAT = 'jsonfm';
/**
* When no uselang parameter is given, this language will be used
*/
private const API_DEFAULT_USELANG = 'user';
/**
* List of available modules: action name => module class
*/
private const MODULES = [
'login' => [
'class' => ApiLogin::class,
'services' => [
'AuthManager',
],
],
'clientlogin' => [
'class' => ApiClientLogin::class,
'services' => [
'AuthManager',
'UrlUtils',
],
],
'logout' => [
'class' => ApiLogout::class,
],
'createaccount' => [
'class' => ApiAMCreateAccount::class,
'services' => [
'AuthManager',
'UrlUtils',
],
],
'linkaccount' => [
'class' => ApiLinkAccount::class,
'services' => [
'AuthManager',
'UrlUtils',
],
],
'unlinkaccount' => [
'class' => ApiRemoveAuthenticationData::class,
'services' => [
'AuthManager',
],
],
'changeauthenticationdata' => [
'class' => ApiChangeAuthenticationData::class,
'services' => [
'AuthManager',
],
],
'removeauthenticationdata' => [
'class' => ApiRemoveAuthenticationData::class,
'services' => [
'AuthManager',
],
],
'resetpassword' => [
'class' => ApiResetPassword::class,
'services' => [
'PasswordReset',
]
],
'query' => [
'class' => ApiQuery::class,
'services' => [
'ObjectFactory',
'WikiExporterFactory',
'TitleFormatter',
'TitleFactory',
]
],
'expandtemplates' => [
'class' => ApiExpandTemplates::class,
'services' => [
'RevisionStore',
'ParserFactory',
]
],
'parse' => [
'class' => ApiParse::class,
'services' => [
'RevisionLookup',
'SkinFactory',
'LanguageNameUtils',
'LinkBatchFactory',
'LinkCache',
'ContentHandlerFactory',
'ParserFactory',
'WikiPageFactory',
'ContentRenderer',
'ContentTransformer',
'CommentFormatter',
'TempUserCreator',
'UserFactory',
'UrlUtils',
'TitleFormatter',
]
],
'stashedit' => [
'class' => ApiStashEdit::class,
'services' => [
'ContentHandlerFactory',
'PageEditStash',
'RevisionLookup',
'StatsFactory',
'WikiPageFactory',
'TempUserCreator',
'UserFactory',
]
],
'opensearch' => [
'class' => ApiOpenSearch::class,
'services' => [
'LinkBatchFactory',
'SearchEngineConfig',
'SearchEngineFactory',
'UrlUtils',
]
],
'feedcontributions' => [
'class' => ApiFeedContributions::class,
'services' => [
'RevisionStore',
'LinkRenderer',
'LinkBatchFactory',
'HookContainer',
'DBLoadBalancerFactory',
'NamespaceInfo',
'UserFactory',
'CommentFormatter',
]
],
'feedrecentchanges' => [
'class' => ApiFeedRecentChanges::class,
'services' => [
'SpecialPageFactory',
'TempUserConfig',
]
],
'feedwatchlist' => [
'class' => ApiFeedWatchlist::class,
'services' => [
'ParserFactory',
]
],
'help' => [
'class' => ApiHelp::class,
'services' => [
'SkinFactory',
]
],
'paraminfo' => [
'class' => ApiParamInfo::class,
'services' => [
'UserFactory',
],
],
'rsd' => [
'class' => ApiRsd::class,
],
'compare' => [
'class' => ApiComparePages::class,
'services' => [
'RevisionStore',
'ArchivedRevisionLookup',
'SlotRoleRegistry',
'ContentHandlerFactory',
'ContentTransformer',
'CommentFormatter',
'TempUserCreator',
'UserFactory',
]
],
'checktoken' => [
'class' => ApiCheckToken::class,
],
'cspreport' => [
'class' => ApiCSPReport::class,
'services' => [
'UrlUtils',
]
],
'validatepassword' => [
'class' => ApiValidatePassword::class,
'services' => [
'AuthManager',
'UserFactory',
]
],
// Write modules
'purge' => [
'class' => ApiPurge::class,
'services' => [
'WikiPageFactory',
'TitleFormatter',
],
],
'setnotificationtimestamp' => [
'class' => ApiSetNotificationTimestamp::class,
'services' => [
'DBLoadBalancerFactory',
'RevisionStore',
'WatchedItemStore',
'TitleFormatter',
'TitleFactory',
]
],
'rollback' => [
'class' => ApiRollback::class,
'services' => [
'RollbackPageFactory',
'WatchlistManager',
'UserOptionsLookup',
]
],
'delete' => [
'class' => ApiDelete::class,
'services' => [
'RepoGroup',
'WatchlistManager',
'UserOptionsLookup',
'DeletePageFactory',
]
],
'undelete' => [
'class' => ApiUndelete::class,
'services' => [
'WatchlistManager',
'UserOptionsLookup',
'UndeletePageFactory',
'WikiPageFactory',
]
],
'protect' => [
'class' => ApiProtect::class,
'services' => [
'WatchlistManager',
'UserOptionsLookup',
'RestrictionStore',
]
],
'block' => [
'class' => ApiBlock::class,
'services' => [
'BlockPermissionCheckerFactory',
'BlockUserFactory',
'TitleFactory',
'UserIdentityLookup',
'WatchedItemStore',
'BlockUtils',
'BlockActionInfo',
'WatchlistManager',
'UserOptionsLookup',
]
],
'unblock' => [
'class' => ApiUnblock::class,
'services' => [
'BlockPermissionCheckerFactory',
'UnblockUserFactory',
'UserIdentityLookup',
'WatchedItemStore',
'WatchlistManager',
'UserOptionsLookup',
]
],
'move' => [
'class' => ApiMove::class,
'services' => [
'MovePageFactory',
'RepoGroup',
'WatchlistManager',
'UserOptionsLookup',
]
],
'edit' => [
'class' => ApiEditPage::class,
'services' => [
'ContentHandlerFactory',
'RevisionLookup',
'WatchedItemStore',
'WikiPageFactory',
'WatchlistManager',
'UserOptionsLookup',
'RedirectLookup',
'TempUserCreator',
'UserFactory',
]
],
'upload' => [
'class' => ApiUpload::class,
'services' => [
'JobQueueGroup',
'WatchlistManager',
'UserOptionsLookup',
]
],
'filerevert' => [
'class' => ApiFileRevert::class,
'services' => [
'RepoGroup',
]
],
'emailuser' => [
'class' => ApiEmailUser::class,
'services' => [
'EmailUserFactory',
'UserFactory',
]
],
'watch' => [
'class' => ApiWatch::class,
'services' => [
'WatchlistManager',
'TitleFormatter',
]
],
'patrol' => [
'class' => ApiPatrol::class,
'services' => [
'RevisionStore',
]
],
'import' => [
'class' => ApiImport::class,
'services' => [
'WikiImporterFactory',
]
],
'clearhasmsg' => [
'class' => ApiClearHasMsg::class,
'services' => [
'TalkPageNotificationManager',
]
],
'userrights' => [
'class' => ApiUserrights::class,
'services' => [
'UserGroupManager',
'WatchedItemStore',
'WatchlistManager',
'UserOptionsLookup',
]
],
'options' => [
'class' => ApiOptions::class,
'services' => [
'UserOptionsManager',
'PreferencesFactory',
],
],
'imagerotate' => [
'class' => ApiImageRotate::class,
'services' => [
'RepoGroup',
'TempFSFileFactory',
'TitleFactory',
]
],
'revisiondelete' => [
'class' => ApiRevisionDelete::class,
],
'managetags' => [
'class' => ApiManageTags::class,
],
'tag' => [
'class' => ApiTag::class,
'services' => [
'DBLoadBalancerFactory',
'RevisionStore',
'ChangeTagsStore',
]
],
'mergehistory' => [
'class' => ApiMergeHistory::class,
'services' => [
'MergeHistoryFactory',
],
],
'setpagelanguage' => [
'class' => ApiSetPageLanguage::class,
'services' => [
'DBLoadBalancerFactory',
'LanguageNameUtils',
]
],
'changecontentmodel' => [
'class' => ApiChangeContentModel::class,
'services' => [
'ContentHandlerFactory',
'ContentModelChangeFactory',
]
],
'acquiretempusername' => [
'class' => ApiAcquireTempUserName::class,
'services' => [
'TempUserCreator',
]
],
];
/**
* List of available formats: format name => format class
*/
private const FORMATS = [
'json' => [
'class' => ApiFormatJson::class,
],
'jsonfm' => [
'class' => ApiFormatJson::class,
],
'php' => [
'class' => ApiFormatPhp::class,
],
'phpfm' => [
'class' => ApiFormatPhp::class,
],
'xml' => [
'class' => ApiFormatXml::class,
],
'xmlfm' => [
'class' => ApiFormatXml::class,
],
'rawfm' => [
'class' => ApiFormatJson::class,
],
'none' => [
'class' => ApiFormatNone::class,
],
];
/**
* List of user roles that are specifically relevant to the API.
* [ 'right' => [ 'msg' => 'Some message with a $1',
* 'params' => [ $someVarToSubst ] ],
* ];
*/
private const RIGHTS_MAP = [
'apihighlimits' => [
'msg' => 'api-help-right-apihighlimits',
'params' => [ ApiBase::LIMIT_SML2, ApiBase::LIMIT_BIG2 ]
]
];
/** @var ApiFormatBase|null */
private $mPrinter;
/** @var ApiModuleManager */
private $mModuleMgr;
/** @var ApiResult */
private $mResult;
/** @var ApiErrorFormatter */
private $mErrorFormatter;
/** @var ApiParamValidator */
private $mParamValidator;
/** @var ApiContinuationManager|null */
private $mContinuationManager;
/** @var string|null */
private $mAction;
/** @var bool */
private $mEnableWrite;
/** @var bool */
private $mInternalMode;
/** @var ApiBase */
private $mModule;
/** @var string */
private $mCacheMode = 'private';
/** @var array */
private $mCacheControl = [];
/** @var array */
private $mParamsUsed = [];
/** @var array */
private $mParamsSensitive = [];
/** @var bool|null Cached return value from self::lacksSameOriginSecurity() */
private $lacksSameOriginSecurity = null;
/** @var StatsFactory */
private $statsFactory;
/**
* Constructs an instance of ApiMain that utilizes the module and format specified by $request.
*
* @stable to call
* @param IContextSource|WebRequest|null $context If this is an instance of
* MediaWiki\Request\FauxRequest, errors are thrown and no printing occurs
* @param bool $enableWrite Should be set to true if the api may modify data
* @param bool|null $internal Whether the API request is an internal faux
* request. If null or not given, the request is assumed to be internal
* if $context contains a FauxRequest.
*/
public function __construct( $context = null, $enableWrite = false, $internal = null ) {
if ( $context === null ) {
$context = RequestContext::getMain();
} elseif ( $context instanceof WebRequest ) {
// BC for pre-1.19
$request = $context;
$context = RequestContext::getMain();
}
// We set a derivative context so we can change stuff later
$derivativeContext = new DerivativeContext( $context );
$this->setContext( $derivativeContext );
if ( isset( $request ) ) {
$derivativeContext->setRequest( $request );
} else {
$request = $this->getRequest();
}
$this->mInternalMode = $internal ?? ( $request instanceof FauxRequest );
// Special handling for the main module: $parent === $this
parent::__construct( $this, $this->mInternalMode ? 'main_int' : 'main' );
$config = $this->getConfig();
// TODO inject stuff, see T265644
$services = MediaWikiServices::getInstance();
if ( !$this->mInternalMode ) {
// If we're in a mode that breaks the same-origin policy, strip
// user credentials for security.
if ( $this->lacksSameOriginSecurity() ) {
wfDebug( "API: stripping user credentials when the same-origin policy is not applied" );
$user = $services->getUserFactory()->newAnonymous();
StubGlobalUser::setUser( $user );
$derivativeContext->setUser( $user );
$request->response()->header( 'MediaWiki-Login-Suppressed: true' );
}
}
$this->mParamValidator = new ApiParamValidator(
$this,
$services->getObjectFactory()
);
$this->statsFactory = $services->getStatsFactory();
$this->mResult =
new ApiResult( $this->getConfig()->get( MainConfigNames::APIMaxResultSize ) );
// Setup uselang. This doesn't use $this->getParameter()
// because we're not ready to handle errors yet.
// Optimisation: Avoid slow getVal(), this isn't user-generated content.
$uselang = $request->getRawVal( 'uselang' ) ?? self::API_DEFAULT_USELANG;
if ( $uselang === 'user' ) {
// Assume the parent context is going to return the user language
// for uselang=user (see T85635).
} else {
if ( $uselang === 'content' ) {
$uselang = $services->getContentLanguage()->getCode();
}
$code = RequestContext::sanitizeLangCode( $uselang );
$derivativeContext->setLanguage( $code );
if ( !$this->mInternalMode ) {
// phpcs:disable MediaWiki.Usage.ExtendClassUsage.FunctionVarUsage
global $wgLang;
$wgLang = $derivativeContext->getLanguage();
RequestContext::getMain()->setLanguage( $wgLang );
// phpcs:enable MediaWiki.Usage.ExtendClassUsage.FunctionVarUsage
}
}
// Set up the error formatter. This doesn't use $this->getParameter()
// because we're not ready to handle errors yet.
// Optimisation: Avoid slow getVal(), this isn't user-generated content.
$errorFormat = $request->getRawVal( 'errorformat' ) ?? 'bc';
$errorLangCode = $request->getRawVal( 'errorlang' ) ?? 'uselang';
$errorsUseDB = $request->getCheck( 'errorsuselocal' );
if ( in_array( $errorFormat, [ 'plaintext', 'wikitext', 'html', 'raw', 'none' ], true ) ) {
if ( $errorLangCode === 'uselang' ) {
$errorLang = $this->getLanguage();
} elseif ( $errorLangCode === 'content' ) {
$errorLang = $services->getContentLanguage();
} else {
$errorLangCode = RequestContext::sanitizeLangCode( $errorLangCode );
$errorLang = $services->getLanguageFactory()->getLanguage( $errorLangCode );
}
$this->mErrorFormatter = new ApiErrorFormatter(
$this->mResult,
$errorLang,
$errorFormat,
$errorsUseDB
);
} else {
$this->mErrorFormatter = new ApiErrorFormatter_BackCompat( $this->mResult );
}
$this->mResult->setErrorFormatter( $this->getErrorFormatter() );
$this->mModuleMgr = new ApiModuleManager(
$this,
$services->getObjectFactory()
);
$this->mModuleMgr->addModules( self::MODULES, 'action' );
$this->mModuleMgr->addModules( $config->get( MainConfigNames::APIModules ), 'action' );
$this->mModuleMgr->addModules( self::FORMATS, 'format' );
$this->mModuleMgr->addModules( $config->get( MainConfigNames::APIFormatModules ), 'format' );
$this->getHookRunner()->onApiMain__moduleManager( $this->mModuleMgr );
$this->mContinuationManager = null;
$this->mEnableWrite = $enableWrite;
}
/**
* Return true if the API was started by other PHP code using MediaWiki\Request\FauxRequest
* @return bool
*/
public function isInternalMode() {
return $this->mInternalMode;
}
/**
* Get the ApiResult object associated with current request
*
* @return ApiResult
*/
public function getResult() {
return $this->mResult;
}
/**
* Get the security flag for the current request
* @return bool
*/
public function lacksSameOriginSecurity() {
if ( $this->lacksSameOriginSecurity !== null ) {
return $this->lacksSameOriginSecurity;
}
$request = $this->getRequest();
// JSONP mode
if ( $request->getCheck( 'callback' ) ||
// Anonymous CORS
$request->getVal( 'origin' ) === '*' ||
// Header to be used from XMLHTTPRequest when the request might
// otherwise be used for XSS.
$request->getHeader( 'Treat-as-Untrusted' ) !== false
) {
$this->lacksSameOriginSecurity = true;
return true;
}
// Allow extensions to override.
$this->lacksSameOriginSecurity = !$this->getHookRunner()
->onRequestHasSameOriginSecurity( $request );
return $this->lacksSameOriginSecurity;
}
/**
* Get the ApiErrorFormatter object associated with current request
* @return ApiErrorFormatter
*/
public function getErrorFormatter() {
return $this->mErrorFormatter;
}
/**
* @return ApiContinuationManager|null
*/
public function getContinuationManager() {
return $this->mContinuationManager;
}
/**
* @param ApiContinuationManager|null $manager
*/
public function setContinuationManager( ?ApiContinuationManager $manager = null ) {
if ( $manager !== null && $this->mContinuationManager !== null ) {
throw new UnexpectedValueException(
__METHOD__ . ': tried to set manager from ' . $manager->getSource() .
' when a manager is already set from ' . $this->mContinuationManager->getSource()
);
}
$this->mContinuationManager = $manager;
}
/**
* Get the parameter validator
* @return ApiParamValidator
*/
public function getParamValidator(): ApiParamValidator {
return $this->mParamValidator;
}
/**
* Get the API module object. Only works after executeAction()
*
* @return ApiBase
*/
public function getModule() {
return $this->mModule;
}
/**
* Get the result formatter object. Only works after setupExecuteAction()
*
* @return ApiFormatBase
*/
public function getPrinter() {
return $this->mPrinter;
}
/**
* Set how long the response should be cached.
*
* @param int $maxage
*/
public function setCacheMaxAge( $maxage ) {
$this->setCacheControl( [
'max-age' => $maxage,
's-maxage' => $maxage
] );
}
/**
* Set the type of caching headers which will be sent.
*
* @param string $mode One of:
* - 'public': Cache this object in public caches, if the maxage or smaxage
* parameter is set, or if setCacheMaxAge() was called. If a maximum age is
* not provided by any of these means, the object will be private.
* - 'private': Cache this object only in private client-side caches.
* - 'anon-public-user-private': Make this object cacheable for logged-out
* users, but private for logged-in users. IMPORTANT: If this is set, it must be
* set consistently for a given URL, it cannot be set differently depending on
* things like the contents of the database, or whether the user is logged in.
*
* If the wiki does not allow anonymous users to read it, the mode set here
* will be ignored, and private caching headers will always be sent. In other words,
* the "public" mode is equivalent to saying that the data sent is as public as a page
* view.
*
* For user-dependent data, the private mode should generally be used. The
* anon-public-user-private mode should only be used where there is a particularly
* good performance reason for caching the anonymous response, but where the
* response to logged-in users may differ, or may contain private data.
*
* If this function is never called, then the default will be the private mode.
*/
public function setCacheMode( $mode ) {
if ( !in_array( $mode, [ 'private', 'public', 'anon-public-user-private' ] ) ) {
wfDebug( __METHOD__ . ": unrecognised cache mode \"$mode\"" );
// Ignore for forwards-compatibility
return;
}
if ( !$this->getPermissionManager()->isEveryoneAllowed( 'read' ) ) {
// Private wiki, only private headers
if ( $mode !== 'private' ) {
wfDebug( __METHOD__ . ": ignoring request for $mode cache mode, private wiki" );
return;
}
}
if ( $mode === 'public' && $this->getParameter( 'uselang' ) === 'user' ) {
// User language is used for i18n, so we don't want to publicly
// cache. Anons are ok, because if they have non-default language
// then there's an appropriate Vary header set by whatever set
// their non-default language.
wfDebug( __METHOD__ . ": downgrading cache mode 'public' to " .
"'anon-public-user-private' due to uselang=user" );
$mode = 'anon-public-user-private';
}
wfDebug( __METHOD__ . ": setting cache mode $mode" );
$this->mCacheMode = $mode;
}
public function getCacheMode() {
return $this->mCacheMode;
}
/**
* Set directives (key/value pairs) for the Cache-Control header.
* Boolean values will be formatted as such, by including or omitting
* without an equals sign.
*
* Cache control values set here will only be used if the cache mode is not
* private, see setCacheMode().
*
* @param array $directives
*/
public function setCacheControl( $directives ) {
$this->mCacheControl = $directives + $this->mCacheControl;
}
/**
* Create an instance of an output formatter by its name
*
* @param string $format
*
* @return ApiFormatBase
*/
public function createPrinterByName( $format ) {
$printer = $this->mModuleMgr->getModule( $format, 'format', /* $ignoreCache */ true );
if ( $printer === null ) {
$this->dieWithError(
[ 'apierror-unknownformat', wfEscapeWikiText( $format ) ], 'unknown_format'
);
}
// @phan-suppress-next-line PhanTypeMismatchReturnSuperType
return $printer;
}
/**
* Execute api request. Any errors will be handled if the API was called by the remote client.
*/
public function execute() {
if ( $this->mInternalMode ) {
$this->executeAction();
} else {
$this->executeActionWithErrorHandling();
}
}
/**
* Execute an action, and in case of an error, erase whatever partial results
* have been accumulated, and replace it with an error message and a help screen.
*/
protected function executeActionWithErrorHandling() {
// Verify the CORS header before executing the action
if ( !$this->handleCORS() ) {
// handleCORS() has sent a 403, abort
return;
}
// Exit here if the request method was OPTIONS
// (assume there will be a followup GET or POST)
if ( $this->getRequest()->getMethod() === 'OPTIONS' ) {
return;
}
// In case an error occurs during data output,
// clear the output buffer and print just the error information
$obLevel = ob_get_level();
ob_start();
$t = microtime( true );
$isError = false;
try {
$this->executeAction();
$runTime = microtime( true ) - $t;
$this->logRequest( $runTime );
$this->statsFactory->getTiming( 'api_executeTiming_seconds' )
->setLabel( 'module', $this->mModule->getModuleName() )
->copyToStatsdAt( 'api.' . $this->mModule->getModuleName() . '.executeTiming' )
->observe( 1000 * $runTime );
} catch ( Throwable $e ) {
$this->handleException( $e );
$this->logRequest( microtime( true ) - $t, $e );
$isError = true;
}
// Disable the client cache on the output so that BlockManager::trackBlockWithCookie is executed
// as part of MediaWiki::preOutputCommit().
if (
$this->mCacheMode === 'private'
|| (
$this->mCacheMode === 'anon-public-user-private'
&& SessionManager::getGlobalSession()->isPersistent()
)
) {
$this->getContext()->getOutput()->disableClientCache();
$this->getContext()->getOutput()->considerCacheSettingsFinal();
}
// Commit DBs and send any related cookies and headers
MediaWiki::preOutputCommit( $this->getContext() );
// Send cache headers after any code which might generate an error, to
// avoid sending public cache headers for errors.
$this->sendCacheHeaders( $isError );
// Executing the action might have already messed with the output
// buffers.
while ( ob_get_level() > $obLevel ) {
ob_end_flush();
}
}
/**
* Handle a throwable as an API response
*
* @since 1.23
* @param Throwable $e
*/
protected function handleException( Throwable $e ) {
// T65145: Rollback any open database transactions
if ( !$e instanceof ApiUsageException ) {
// ApiUsageExceptions are intentional, so don't rollback if that's the case
MWExceptionHandler::rollbackPrimaryChangesAndLog(
$e,
MWExceptionHandler::CAUGHT_BY_ENTRYPOINT
);
}
// Allow extra cleanup and logging
$this->getHookRunner()->onApiMain__onException( $this, $e );
// Handle any kind of exception by outputting properly formatted error message.
// If this fails, an unhandled exception should be thrown so that global error
// handler will process and log it.
$errCodes = $this->substituteResultWithError( $e );
// Error results should not be cached
$this->setCacheMode( 'private' );
$response = $this->getRequest()->response();
$headerStr = 'MediaWiki-API-Error: ' . implode( ', ', $errCodes );
$response->header( $headerStr );
// Reset and print just the error message
ob_clean();
// Printer may not be initialized if the extractRequestParams() fails for the main module
$this->createErrorPrinter();
// Get desired HTTP code from an ApiUsageException. Don't use codes from other
// exception types, as they are unlikely to be intended as an HTTP code.
$httpCode = $e instanceof ApiUsageException ? $e->getCode() : 0;
$failed = false;
try {
$this->printResult( $httpCode );
} catch ( ApiUsageException $ex ) {
// The error printer itself is failing. Try suppressing its request
// parameters and redo.
$failed = true;
$this->addWarning( 'apiwarn-errorprinterfailed' );
foreach ( $ex->getStatusValue()->getMessages() as $error ) {
try {
$this->mPrinter->addWarning( $error );
} catch ( Throwable $ex2 ) {
// WTF?
$this->addWarning( $error );
}
}
}
if ( $failed ) {
$this->mPrinter = null;
$this->createErrorPrinter();
// @phan-suppress-next-line PhanNonClassMethodCall False positive
$this->mPrinter->forceDefaultParams();
if ( $httpCode ) {
$response->statusHeader( 200 ); // Reset in case the fallback doesn't want a non-200
}
$this->printResult( $httpCode );
}
}
/**
* Handle a throwable from the ApiBeforeMain hook.
*
* This tries to print the throwable as an API response, to be more
* friendly to clients. If it fails, it will rethrow the throwable.
*
* @since 1.23
* @param Throwable $e
* @throws Throwable
*/
public static function handleApiBeforeMainException( Throwable $e ) {
ob_start();
try {
$main = new self( RequestContext::getMain(), false );
$main->handleException( $e );
$main->logRequest( 0, $e );
} catch ( Throwable $e2 ) {
// Nope, even that didn't work. Punt.
throw $e;
}
// Reset cache headers
$main->sendCacheHeaders( true );
ob_end_flush();
}
/**
* Check the &origin= query parameter against the Origin: HTTP header and respond appropriately.
*
* If no origin parameter is present, nothing happens.
* If an origin parameter is present but doesn't match the Origin header, a 403 status code
* is set and false is returned.
* If the parameter and the header do match, the header is checked against $wgCrossSiteAJAXdomains
* and $wgCrossSiteAJAXdomainExceptions, and if the origin qualifies, the appropriate CORS
* headers are set.
* https://www.w3.org/TR/cors/#resource-requests
* https://www.w3.org/TR/cors/#resource-preflight-requests
*
* @return bool False if the caller should abort (403 case), true otherwise (all other cases)
*/
protected function handleCORS() {
$originParam = $this->getParameter( 'origin' ); // defaults to null
if ( $originParam === null ) {
// No origin parameter, nothing to do
return true;
}
$request = $this->getRequest();
$response = $request->response();
$allowTiming = false;
$varyOrigin = true;
if ( $originParam === '*' ) {
// Request for anonymous CORS
// Technically we should check for the presence of an Origin header
// and not process it as CORS if it's not set, but that would
// require us to vary on Origin for all 'origin=*' requests which
// we don't want to do.
$matchedOrigin = true;
$allowOrigin = '*';
$allowCredentials = 'false';
$varyOrigin = false; // No need to vary
} else {
// Non-anonymous CORS, check we allow the domain
// Origin: header is a space-separated list of origins, check all of them
$originHeader = $request->getHeader( 'Origin' );
if ( $originHeader === false ) {
$origins = [];
} else {
$originHeader = trim( $originHeader );
$origins = preg_split( '/\s+/', $originHeader );
}
if ( !in_array( $originParam, $origins ) ) {
// origin parameter set but incorrect
// Send a 403 response
$response->statusHeader( 403 );
$response->header( 'Cache-Control: no-cache' );
echo "'origin' parameter does not match Origin header\n";
return false;
}
$config = $this->getConfig();
$origin = Origin::parseHeaderList( $origins );
$matchedOrigin = $origin->match(
$config->get( MainConfigNames::CrossSiteAJAXdomains ),
$config->get( MainConfigNames::CrossSiteAJAXdomainExceptions )
);
$allowOrigin = $originHeader;
$allowCredentials = 'true';
$allowTiming = $originHeader;
}
if ( $matchedOrigin ) {
$requestedMethod = $request->getHeader( 'Access-Control-Request-Method' );
$preflight = $request->getMethod() === 'OPTIONS' && $requestedMethod !== false;
if ( $preflight ) {
// We allow the actual request to send the following headers
$requestedHeaders = $request->getHeader( 'Access-Control-Request-Headers' );
$allowedHeaders = $this->getConfig()->get( MainConfigNames::AllowedCorsHeaders );
if ( $requestedHeaders !== false ) {
if ( !self::matchRequestedHeaders( $requestedHeaders, $allowedHeaders ) ) {
$response->header( 'MediaWiki-CORS-Rejection: Unsupported header requested in preflight' );
return true;
}
$response->header( 'Access-Control-Allow-Headers: ' . $requestedHeaders );
}
// We only allow the actual request to be GET, POST, or HEAD
$response->header( 'Access-Control-Allow-Methods: POST, GET, HEAD' );
}
$response->header( "Access-Control-Allow-Origin: $allowOrigin" );
$response->header( "Access-Control-Allow-Credentials: $allowCredentials" );
// https://www.w3.org/TR/resource-timing/#timing-allow-origin
if ( $allowTiming !== false ) {
$response->header( "Timing-Allow-Origin: $allowTiming" );
}
if ( !$preflight ) {
$response->header(
'Access-Control-Expose-Headers: MediaWiki-API-Error, Retry-After, X-Database-Lag, '
. 'MediaWiki-Login-Suppressed'
);
}
} else {
$response->header( 'MediaWiki-CORS-Rejection: Origin mismatch' );
}
if ( $varyOrigin ) {
$this->getOutput()->addVaryHeader( 'Origin' );
}
return true;
}
/**
* Attempt to validate the value of Access-Control-Request-Headers against a list
* of headers that we allow the follow up request to send.
*
* @param string $requestedHeaders Comma separated list of HTTP headers
* @param string[] $allowedHeaders List of allowed HTTP headers
* @return bool True if all requested headers are in the list of allowed headers
*/
protected static function matchRequestedHeaders( $requestedHeaders, $allowedHeaders ) {
if ( trim( $requestedHeaders ) === '' ) {
return true;
}
$requestedHeaders = explode( ',', $requestedHeaders );
$allowedHeaders = array_change_key_case(
array_fill_keys( $allowedHeaders, true ), CASE_LOWER );
foreach ( $requestedHeaders as $rHeader ) {
$rHeader = strtolower( trim( $rHeader ) );
if ( !isset( $allowedHeaders[$rHeader] ) ) {
LoggerFactory::getInstance( 'api-warning' )->warning(
'CORS preflight failed on requested header: {header}', [
'header' => $rHeader
]
);
return false;
}
}
return true;
}
/**
* Send caching headers
* @param bool $isError Whether an error response is being output
* @since 1.26 added $isError parameter
*/
protected function sendCacheHeaders( $isError ) {
$response = $this->getRequest()->response();
$out = $this->getOutput();
$out->addVaryHeader( 'Treat-as-Untrusted' );
$config = $this->getConfig();
if ( $config->get( MainConfigNames::VaryOnXFP ) ) {
$out->addVaryHeader( 'X-Forwarded-Proto' );
}
if ( !$isError && $this->mModule &&
( $this->getRequest()->getMethod() === 'GET' || $this->getRequest()->getMethod() === 'HEAD' )
) {
$etag = $this->mModule->getConditionalRequestData( 'etag' );
if ( $etag !== null ) {
$response->header( "ETag: $etag" );
}
$lastMod = $this->mModule->getConditionalRequestData( 'last-modified' );
if ( $lastMod !== null ) {
$response->header( 'Last-Modified: ' . wfTimestamp( TS_RFC2822, $lastMod ) );
}
}
// The logic should be:
// $this->mCacheControl['max-age'] is set?
// Use it, the module knows better than our guess.
// !$this->mModule || $this->mModule->isWriteMode(), and mCacheMode is private?
// Use 0 because we can guess caching is probably the wrong thing to do.
// Use $this->getParameter( 'maxage' ), which already defaults to 0.
$maxage = 0;
if ( isset( $this->mCacheControl['max-age'] ) ) {
$maxage = $this->mCacheControl['max-age'];
} elseif ( ( !$isError && $this->mModule && !$this->mModule->isWriteMode() ) ||
$this->mCacheMode !== 'private'
) {
$maxage = $this->getParameter( 'maxage' );
}
$privateCache = 'private, must-revalidate, max-age=' . $maxage;
if ( $this->mCacheMode == 'private' ) {
$response->header( "Cache-Control: $privateCache" );
return;
}
if ( $this->mCacheMode == 'anon-public-user-private' ) {
$out->addVaryHeader( 'Cookie' );
$response->header( $out->getVaryHeader() );
if ( SessionManager::getGlobalSession()->isPersistent() ) {
// Logged in or otherwise has session (e.g. anonymous users who have edited)
// Mark request private
$response->header( "Cache-Control: $privateCache" );
return;
} // else anonymous, send public headers below
}
// Send public headers
$response->header( $out->getVaryHeader() );
// If nobody called setCacheMaxAge(), use the (s)maxage parameters
if ( !isset( $this->mCacheControl['s-maxage'] ) ) {
$this->mCacheControl['s-maxage'] = $this->getParameter( 'smaxage' );
}
if ( !isset( $this->mCacheControl['max-age'] ) ) {
$this->mCacheControl['max-age'] = $this->getParameter( 'maxage' );
}
if ( !$this->mCacheControl['s-maxage'] && !$this->mCacheControl['max-age'] ) {
// Public cache not requested
// Sending a Vary header in this case is harmless, and protects us
// against conditional calls of setCacheMaxAge().
$response->header( "Cache-Control: $privateCache" );
return;
}
$this->mCacheControl['public'] = true;
// Send an Expires header
$maxAge = min( $this->mCacheControl['s-maxage'], $this->mCacheControl['max-age'] );
$expiryUnixTime = ( $maxAge == 0 ? 1 : time() + $maxAge );
$response->header( 'Expires: ' . wfTimestamp( TS_RFC2822, $expiryUnixTime ) );
// Construct the Cache-Control header
$ccHeader = '';
$separator = '';
foreach ( $this->mCacheControl as $name => $value ) {
if ( is_bool( $value ) ) {
if ( $value ) {
$ccHeader .= $separator . $name;
$separator = ', ';
}
} else {
$ccHeader .= $separator . "$name=$value";
$separator = ', ';
}
}
$response->header( "Cache-Control: $ccHeader" );
}
/**
* Create the printer for error output
*/
private function createErrorPrinter() {
if ( !isset( $this->mPrinter ) ) {
$value = $this->getRequest()->getVal( 'format', self::API_DEFAULT_FORMAT );
if ( !$this->mModuleMgr->isDefined( $value, 'format' ) ) {
$value = self::API_DEFAULT_FORMAT;
}
// @phan-suppress-next-line PhanTypeMismatchArgumentNullable getVal does not return null here
$this->mPrinter = $this->createPrinterByName( $value );
}
// Printer may not be able to handle errors. This is particularly
// likely if the module returns something for getCustomPrinter().
if ( !$this->mPrinter->canPrintErrors() ) {
$this->mPrinter = $this->createPrinterByName( self::API_DEFAULT_FORMAT );
}
}
/**
* Create an error message for the given throwable.
*
* If an ApiUsageException, errors/warnings will be extracted from the
* embedded StatusValue.
*
* Any other throwable will be returned with a generic code and wrapper
* text around the throwable's (presumably English) message as a single
* error (no warnings).
*
* @param Throwable $e
* @param string $type 'error' or 'warning'
* @return ApiMessage[]
* @since 1.27
*/
protected function errorMessagesFromException( Throwable $e, $type = 'error' ) {
$messages = [];
if ( $e instanceof ApiUsageException ) {
foreach ( $e->getStatusValue()->getMessages( $type ) as $msg ) {
$messages[] = ApiMessage::create( $msg );
}
} elseif ( $type !== 'error' ) {
// None of the rest have any messages for non-error types
} else {
// TODO: Avoid embedding arbitrary class names in the error code.
$class = preg_replace( '#^Wikimedia\\\\Rdbms\\\\#', '', get_class( $e ) );
$code = 'internal_api_error_' . $class;
$data = [ 'errorclass' => get_class( $e ) ];
if ( MWExceptionRenderer::shouldShowExceptionDetails() ) {
if ( $e instanceof ILocalizedException ) {
$msg = $e->getMessageObject();
} elseif ( $e instanceof MessageSpecifier ) {
$msg = Message::newFromSpecifier( $e );
} else {
$msg = wfEscapeWikiText( $e->getMessage() );
}
$params = [ 'apierror-exceptioncaught', WebRequest::getRequestId(), $msg ];
} else {
$params = [ 'apierror-exceptioncaughttype', WebRequest::getRequestId(), get_class( $e ) ];
}
$messages[] = ApiMessage::create( $params, $code, $data );
}
return $messages;
}
/**
* Replace the result data with the information about a throwable.
* @param Throwable $e
* @return string[] Error codes
*/
protected function substituteResultWithError( Throwable $e ) {
$result = $this->getResult();
$formatter = $this->getErrorFormatter();
$config = $this->getConfig();
$errorCodes = [];
// Remember existing warnings and errors across the reset
$errors = $result->getResultData( [ 'errors' ] );
$warnings = $result->getResultData( [ 'warnings' ] );
$result->reset();
if ( $warnings !== null ) {
$result->addValue( null, 'warnings', $warnings, ApiResult::NO_SIZE_CHECK );
}
if ( $errors !== null ) {
$result->addValue( null, 'errors', $errors, ApiResult::NO_SIZE_CHECK );
// Collect the copied error codes for the return value
foreach ( $errors as $error ) {
if ( isset( $error['code'] ) ) {
$errorCodes[$error['code']] = true;
}
}
}
// Add errors from the exception
$modulePath = $e instanceof ApiUsageException ? $e->getModulePath() : null;
foreach ( $this->errorMessagesFromException( $e, 'error' ) as $msg ) {
if ( ApiErrorFormatter::isValidApiCode( $msg->getApiCode() ) ) {
$errorCodes[$msg->getApiCode()] = true;
} else {
LoggerFactory::getInstance( 'api-warning' )->error( 'Invalid API error code "{code}"', [
'code' => $msg->getApiCode(),
'exception' => $e,
] );
$errorCodes['<invalid-code>'] = true;
}
$formatter->addError( $modulePath, $msg );
}
foreach ( $this->errorMessagesFromException( $e, 'warning' ) as $msg ) {
$formatter->addWarning( $modulePath, $msg );
}
// Add additional data. Path depends on whether we're in BC mode or not.
// Data depends on the type of exception.
if ( $formatter instanceof ApiErrorFormatter_BackCompat ) {
$path = [ 'error' ];
} else {
$path = null;
}
if ( $e instanceof ApiUsageException ) {
$link = (string)MediaWikiServices::getInstance()->getUrlUtils()->expand( wfScript( 'api' ) );
$result->addContentValue(
$path,
'docref',
trim(
$this->msg( 'api-usage-docref', $link )->inLanguage( $formatter->getLanguage() )->text()
. ' '
. $this->msg( 'api-usage-mailinglist-ref' )->inLanguage( $formatter->getLanguage() )->text()
)
);
} elseif ( $config->get( MainConfigNames::ShowExceptionDetails ) ) {
$result->addContentValue(
$path,
'trace',
$this->msg( 'api-exception-trace',
get_class( $e ),
$e->getFile(),
$e->getLine(),
MWExceptionHandler::getRedactedTraceAsString( $e )
)->inLanguage( $formatter->getLanguage() )->text()
);
}
// Add the id and such
$this->addRequestedFields( [ 'servedby' ] );
return array_keys( $errorCodes );
}
/**
* Add requested fields to the result
* @param string[] $force Which fields to force even if not requested. Accepted values are:
* - servedby
*/
protected function addRequestedFields( $force = [] ) {
$result = $this->getResult();
$requestid = $this->getParameter( 'requestid' );
if ( $requestid !== null ) {
$result->addValue( null, 'requestid', $requestid, ApiResult::NO_SIZE_CHECK );
}
if ( $this->getConfig()->get( MainConfigNames::ShowHostnames ) && (
in_array( 'servedby', $force, true ) || $this->getParameter( 'servedby' )
) ) {
$result->addValue( null, 'servedby', wfHostname(), ApiResult::NO_SIZE_CHECK );
}
if ( $this->getParameter( 'curtimestamp' ) ) {
$result->addValue( null, 'curtimestamp', wfTimestamp( TS_ISO_8601 ), ApiResult::NO_SIZE_CHECK );
}
if ( $this->getParameter( 'responselanginfo' ) ) {
$result->addValue(
null,
'uselang',
$this->getLanguage()->getCode(),
ApiResult::NO_SIZE_CHECK
);
$result->addValue(
null,
'errorlang',
$this->getErrorFormatter()->getLanguage()->getCode(),
ApiResult::NO_SIZE_CHECK
);
}
}
/**
* Set up for the execution.
* @return array
*/
protected function setupExecuteAction() {
$this->addRequestedFields();
$params = $this->extractRequestParams();
$this->mAction = $params['action'];
return $params;
}
/**
* Set up the module for response
* @return ApiBase The module that will handle this action
* @throws ApiUsageException
*/
protected function setupModule() {
// Instantiate the module requested by the user
$module = $this->mModuleMgr->getModule( $this->mAction, 'action' );
if ( $module === null ) {
// Probably can't happen
// @codeCoverageIgnoreStart
$this->dieWithError(
[ 'apierror-unknownaction', wfEscapeWikiText( $this->mAction ) ],
'unknown_action'
);
// @codeCoverageIgnoreEnd
}
$moduleParams = $module->extractRequestParams();
// Check token, if necessary
if ( $module->needsToken() === true ) {
throw new LogicException(
"Module '{$module->getModuleName()}' must be updated for the new token handling. " .
'See documentation for ApiBase::needsToken for details.'
);
}
if ( $module->needsToken() ) {
if ( !$module->mustBePosted() ) {
throw new LogicException(
"Module '{$module->getModuleName()}' must require POST to use tokens."
);
}
if ( !isset( $moduleParams['token'] ) ) {
// Probably can't happen
// @codeCoverageIgnoreStart
$module->dieWithError( [ 'apierror-missingparam', 'token' ] );
// @codeCoverageIgnoreEnd
}
$module->requirePostedParameters( [ 'token' ] );
if ( !$module->validateToken( $moduleParams['token'], $moduleParams ) ) {
$module->dieWithError( 'apierror-badtoken' );
}
}
// @phan-suppress-next-line PhanTypeMismatchReturnNullable T240141
return $module;
}
/**
* @return array
*/
private function getMaxLag() {
$services = MediaWikiServices::getInstance();
$dbLag = $services->getDBLoadBalancer()->getMaxLag();
$lagInfo = [
'host' => $dbLag[0],
'lag' => $dbLag[1],
'type' => 'db'
];
$jobQueueLagFactor =
$this->getConfig()->get( MainConfigNames::JobQueueIncludeInMaxLagFactor );
if ( $jobQueueLagFactor ) {
// Turn total number of jobs into seconds by using the configured value
$totalJobs = array_sum( $services->getJobQueueGroup()->getQueueSizes() );
$jobQueueLag = $totalJobs / (float)$jobQueueLagFactor;
if ( $jobQueueLag > $lagInfo['lag'] ) {
$lagInfo = [
'host' => wfHostname(), // XXX: Is there a better value that could be used?
'lag' => $jobQueueLag,
'type' => 'jobqueue',
'jobs' => $totalJobs,
];
}
}
$this->getHookRunner()->onApiMaxLagInfo( $lagInfo );
return $lagInfo;
}
/**
* Check the max lag if necessary
* @param ApiBase $module Api module being used
* @param array $params Array an array containing the request parameters.
* @return bool True on success, false should exit immediately
*/
protected function checkMaxLag( $module, $params ) {
if ( $module->shouldCheckMaxlag() && isset( $params['maxlag'] ) ) {
$maxLag = $params['maxlag'];
$lagInfo = $this->getMaxLag();
if ( $lagInfo['lag'] > $maxLag ) {
$response = $this->getRequest()->response();
$response->header( 'Retry-After: ' . max( (int)$maxLag, 5 ) );
$response->header( 'X-Database-Lag: ' . (int)$lagInfo['lag'] );
if ( $this->getConfig()->get( MainConfigNames::ShowHostnames ) ) {
$this->dieWithError(
[ 'apierror-maxlag', $lagInfo['lag'], $lagInfo['host'] ],
'maxlag',
$lagInfo
);
}
$this->dieWithError( [ 'apierror-maxlag-generic', $lagInfo['lag'] ], 'maxlag', $lagInfo );
}
}
return true;
}
/**
* Check selected RFC 7232 precondition headers
*
* RFC 7232 envisions a particular model where you send your request to "a
* resource", and for write requests that you can read "the resource" by
* changing the method to GET. When the API receives a GET request, it
* works out even though "the resource" from RFC 7232's perspective might
* be many resources from MediaWiki's perspective. But it totally fails for
* a POST, since what HTTP sees as "the resource" is probably just
* "/api.php" with all the interesting bits in the body.
*
* Therefore, we only support RFC 7232 precondition headers for GET (and
* HEAD). That means we don't need to bother with If-Match and
* If-Unmodified-Since since they only apply to modification requests.
*
* And since we don't support Range, If-Range is ignored too.
*
* @since 1.26
* @param ApiBase $module Api module being used
* @return bool True on success, false should exit immediately
*/
protected function checkConditionalRequestHeaders( $module ) {
if ( $this->mInternalMode ) {
// No headers to check in internal mode
return true;
}
if ( $this->getRequest()->getMethod() !== 'GET' && $this->getRequest()->getMethod() !== 'HEAD' ) {
// Don't check POSTs
return true;
}
$return304 = false;
$ifNoneMatch = array_diff(
$this->getRequest()->getHeader( 'If-None-Match', WebRequest::GETHEADER_LIST ) ?: [],
[ '' ]
);
if ( $ifNoneMatch ) {
// @phan-suppress-next-line PhanImpossibleTypeComparison
if ( $ifNoneMatch === [ '*' ] ) {
// API responses always "exist"
$etag = '*';
} else {
$etag = $module->getConditionalRequestData( 'etag' );
}
}
// @phan-suppress-next-line PhanPossiblyUndeclaredVariable $etag is declared when $ifNoneMatch is true
if ( $ifNoneMatch && $etag !== null ) {
$test = str_starts_with( $etag, 'W/' ) ? substr( $etag, 2 ) : $etag;
$match = array_map( static function ( $s ) {
return str_starts_with( $s, 'W/' ) ? substr( $s, 2 ) : $s;
}, $ifNoneMatch );
$return304 = in_array( $test, $match, true );
} else {
$value = trim( $this->getRequest()->getHeader( 'If-Modified-Since' ) );
// Some old browsers sends sizes after the date, like this:
// Wed, 20 Aug 2003 06:51:19 GMT; length=5202
// Ignore that.
$i = strpos( $value, ';' );
if ( $i !== false ) {
$value = trim( substr( $value, 0, $i ) );
}
if ( $value !== '' ) {
try {
$ts = new MWTimestamp( $value );
if (
// RFC 7231 IMF-fixdate
$ts->getTimestamp( TS_RFC2822 ) === $value ||
// RFC 850
$ts->format( 'l, d-M-y H:i:s' ) . ' GMT' === $value ||
// asctime (with and without space-padded day)
$ts->format( 'D M j H:i:s Y' ) === $value ||
$ts->format( 'D M j H:i:s Y' ) === $value
) {
$config = $this->getConfig();
$lastMod = $module->getConditionalRequestData( 'last-modified' );
if ( $lastMod !== null ) {
// Mix in some MediaWiki modification times
$modifiedTimes = [
'page' => $lastMod,
'user' => $this->getUser()->getTouched(),
'epoch' => $config->get( MainConfigNames::CacheEpoch ),
];
if ( $config->get( MainConfigNames::UseCdn ) ) {
// T46570: the core page itself may not change, but resources might
$modifiedTimes['sepoch'] = wfTimestamp(
TS_MW, time() - $config->get( MainConfigNames::CdnMaxAge )
);
}
$this->getHookRunner()->onOutputPageCheckLastModified( $modifiedTimes, $this->getOutput() );
$lastMod = max( $modifiedTimes );
$return304 = wfTimestamp( TS_MW, $lastMod ) <= $ts->getTimestamp( TS_MW );
}
}
} catch ( TimestampException $e ) {
// Invalid timestamp, ignore it
}
}
}
if ( $return304 ) {
$this->getRequest()->response()->statusHeader( 304 );
// Avoid outputting the compressed representation of a zero-length body
AtEase::suppressWarnings();
ini_set( 'zlib.output_compression', 0 );
AtEase::restoreWarnings();
wfResetOutputBuffers( false );
return false;
}
return true;
}
/**
* Check for sufficient permissions to execute
* @param ApiBase $module An Api module
*/
protected function checkExecutePermissions( $module ) {
$user = $this->getUser();
if ( $module->isReadMode() && !$this->getPermissionManager()->isEveryoneAllowed( 'read' ) &&
!$this->getAuthority()->isAllowed( 'read' )
) {
$this->dieWithError( 'apierror-readapidenied' );
}
if ( $module->isWriteMode() ) {
if ( !$this->mEnableWrite ) {
$this->dieWithError( 'apierror-noapiwrite' );
} elseif ( $this->getRequest()->getHeader( 'Promise-Non-Write-API-Action' ) ) {
$this->dieWithError( 'apierror-promised-nonwrite-api' );
}
$this->checkReadOnly( $module );
}
// Allow extensions to stop execution for arbitrary reasons.
// TODO: change hook to accept Authority
$message = 'hookaborted';
if ( !$this->getHookRunner()->onApiCheckCanExecute( $module, $user, $message ) ) {
$this->dieWithError( $message );
}
}
/**
* Check if the DB is read-only for this user
* @param ApiBase $module An Api module
*/
protected function checkReadOnly( $module ) {
if ( MediaWikiServices::getInstance()->getReadOnlyMode()->isReadOnly() ) {
$this->dieReadOnly();
}
if ( $module->isWriteMode()
&& $this->getUser()->isBot()
&& MediaWikiServices::getInstance()->getDBLoadBalancer()->hasReplicaServers()
) {
$this->checkBotReadOnly();
}
}
/**
* Check whether we are readonly for bots
*/
private function checkBotReadOnly() {
// Figure out how many servers have passed the lag threshold
$numLagged = 0;
$lagLimit = $this->getConfig()->get( MainConfigNames::APIMaxLagThreshold );
$laggedServers = [];
$loadBalancer = MediaWikiServices::getInstance()->getDBLoadBalancer();
foreach ( $loadBalancer->getLagTimes() as $serverIndex => $lag ) {
if ( $lag > $lagLimit ) {
++$numLagged;
$laggedServers[] = $loadBalancer->getServerName( $serverIndex ) . " ({$lag}s)";
}
}
// If a majority of replica DBs are too lagged then disallow writes
$replicaCount = $loadBalancer->getServerCount() - 1;
if ( $numLagged >= ceil( $replicaCount / 2 ) ) {
$laggedServers = implode( ', ', $laggedServers );
wfDebugLog(
'api-readonly', // Deprecate this channel in favor of api-warning?
"Api request failed as read only because the following DBs are lagged: $laggedServers"
);
LoggerFactory::getInstance( 'api-warning' )->warning(
"Api request failed as read only because the following DBs are lagged: {laggeddbs}", [
'laggeddbs' => $laggedServers,
]
);
$this->dieWithError(
'readonly_lag',
'readonly',
[ 'readonlyreason' => "Waiting for $numLagged lagged database(s)" ]
);
}
}
/**
* Check asserts of the user's rights
* @param array $params
*/
protected function checkAsserts( $params ) {
if ( isset( $params['assert'] ) ) {
$user = $this->getUser();
switch ( $params['assert'] ) {
case 'anon':
if ( $user->isRegistered() ) {
$this->dieWithError( 'apierror-assertanonfailed' );
}
break;
case 'user':
if ( !$user->isRegistered() ) {
$this->dieWithError( 'apierror-assertuserfailed' );
}
break;
case 'bot':
if ( !$this->getAuthority()->isAllowed( 'bot' ) ) {
$this->dieWithError( 'apierror-assertbotfailed' );
}
break;
}
}
if ( isset( $params['assertuser'] ) ) {
// TODO inject stuff, see T265644
$assertUser = MediaWikiServices::getInstance()->getUserFactory()
->newFromName( $params['assertuser'], UserRigorOptions::RIGOR_NONE );
if ( !$assertUser || !$this->getUser()->equals( $assertUser ) ) {
$this->dieWithError(
[ 'apierror-assertnameduserfailed', wfEscapeWikiText( $params['assertuser'] ) ]
);
}
}
}
/**
* Check POST for external response and setup result printer
* @param ApiBase $module An Api module
* @param array $params An array with the request parameters
*/
protected function setupExternalResponse( $module, $params ) {
$validMethods = [ 'GET', 'HEAD', 'POST', 'OPTIONS' ];
$request = $this->getRequest();
if ( !in_array( $request->getMethod(), $validMethods ) ) {
$this->dieWithError( 'apierror-invalidmethod', null, null, 405 );
}
if ( !$request->wasPosted() && $module->mustBePosted() ) {
// Module requires POST. GET request might still be allowed
// if $wgDebugApi is true, otherwise fail.
$this->dieWithErrorOrDebug( [ 'apierror-mustbeposted', $this->mAction ] );
}
if ( $request->wasPosted() ) {
if ( !$request->getHeader( 'Content-Type' ) ) {
$this->addDeprecation(
'apiwarn-deprecation-post-without-content-type', 'post-without-content-type'
);
}
$contentLength = $request->getHeader( 'Content-Length' );
$maxPostSize = wfShorthandToInteger( ini_get( 'post_max_size' ), 0 );
if ( $maxPostSize && $contentLength > $maxPostSize ) {
$this->dieWithError(
[ 'apierror-http-contenttoolarge', Message::sizeParam( $maxPostSize ) ],
null, null, 413
);
}
}
// See if custom printer is used
$this->mPrinter = $module->getCustomPrinter() ??
// Create an appropriate printer if not set
$this->createPrinterByName( $params['format'] );
if ( $request->getProtocol() === 'http' &&
(
$this->getConfig()->get( MainConfigNames::ForceHTTPS ) ||
$request->getSession()->shouldForceHTTPS() ||
$this->getUser()->requiresHTTPS()
)
) {
$this->addDeprecation( 'apiwarn-deprecation-httpsexpected', 'https-expected' );
}
}
/**
* Execute the actual module, without any error handling
*/
protected function executeAction() {
$params = $this->setupExecuteAction();
// Check asserts early so e.g. errors in parsing a module's parameters due to being
// logged out don't override the client's intended "am I logged in?" check.
$this->checkAsserts( $params );
$module = $this->setupModule();
$this->mModule = $module;
if ( !$this->mInternalMode ) {
ProfilingContext::singleton()->init( MW_ENTRY_POINT, $module->getModuleName() );
$this->setRequestExpectations( $module );
}
$this->checkExecutePermissions( $module );
if ( !$this->checkMaxLag( $module, $params ) ) {
return;
}
if ( !$this->checkConditionalRequestHeaders( $module ) ) {
return;
}
if ( !$this->mInternalMode ) {
$this->setupExternalResponse( $module, $params );
}
$module->execute();
$this->getHookRunner()->onAPIAfterExecute( $module );
$this->reportUnusedParams();
if ( !$this->mInternalMode ) {
MWDebug::appendDebugInfoToApiResult( $this->getContext(), $this->getResult() );
$this->printResult();
}
}
/**
* Set database connection, query, and write expectations given this module request
* @param ApiBase $module
*/
protected function setRequestExpectations( ApiBase $module ) {
$request = $this->getRequest();
$trxLimits = $this->getConfig()->get( MainConfigNames::TrxProfilerLimits );
$trxProfiler = Profiler::instance()->getTransactionProfiler();
$trxProfiler->setLogger( LoggerFactory::getInstance( 'rdbms' ) );
$trxProfiler->setStatsFactory( MediaWikiServices::getInstance()->getStatsFactory() );
$trxProfiler->setRequestMethod( $request->getMethod() );
if ( $request->hasSafeMethod() ) {
$trxProfiler->setExpectations( $trxLimits['GET'], __METHOD__ );
} elseif ( $request->wasPosted() && !$module->isWriteMode() ) {
$trxProfiler->setExpectations( $trxLimits['POST-nonwrite'], __METHOD__ );
} else {
$trxProfiler->setExpectations( $trxLimits['POST'], __METHOD__ );
}
}
/**
* Log the preceding request
* @param float $time Time in seconds
* @param Throwable|null $e Throwable caught while processing the request
*/
protected function logRequest( $time, ?Throwable $e = null ) {
$request = $this->getRequest();
$user = $this->getUser();
$performer = [
'user_text' => $user->getName(),
];
if ( $user->isRegistered() ) {
$performer['user_id'] = $user->getId();
}
$logCtx = [
// https://gerrit.wikimedia.org/g/mediawiki/event-schemas/+/master/jsonschema/mediawiki/api/request
'$schema' => '/mediawiki/api/request/1.0.0',
'meta' => [
'request_id' => WebRequest::getRequestId(),
'id' => MediaWikiServices::getInstance()
->getGlobalIdGenerator()->newUUIDv4(),
'dt' => wfTimestamp( TS_ISO_8601 ),
'domain' => $this->getConfig()->get( MainConfigNames::ServerName ),
// If using the EventBus extension (as intended) with this log channel,
// this stream name will map to a Kafka topic.
'stream' => 'mediawiki.api-request'
],
'http' => [
'method' => $request->getMethod(),
'client_ip' => $request->getIP()
],
'performer' => $performer,
'database' => WikiMap::getCurrentWikiDbDomain()->getId(),
'backend_time_ms' => (int)round( $time * 1000 ),
];
// If set, these headers will be logged in http.request_headers.
$httpRequestHeadersToLog = [ 'accept-language', 'referer', 'user-agent' ];
foreach ( $httpRequestHeadersToLog as $header ) {
if ( $request->getHeader( $header ) ) {
// Set the header in http.request_headers
$logCtx['http']['request_headers'][$header] = $request->getHeader( $header );
}
}
if ( $e ) {
$logCtx['api_error_codes'] = [];
foreach ( $this->errorMessagesFromException( $e ) as $msg ) {
$logCtx['api_error_codes'][] = $msg->getApiCode();
}
}
// Construct space separated message for 'api' log channel
$msg = "API {$request->getMethod()} " .
wfUrlencode( str_replace( ' ', '_', $this->getUser()->getName() ) ) .
" {$logCtx['http']['client_ip']} " .
"T={$logCtx['backend_time_ms']}ms";
$sensitive = array_fill_keys( $this->getSensitiveParams(), true );
foreach ( $this->getParamsUsed() as $name ) {
$value = $request->getVal( $name );
if ( $value === null ) {
continue;
}
if ( isset( $sensitive[$name] ) ) {
$value = '[redacted]';
$encValue = '[redacted]';
} elseif ( strlen( $value ) > 256 ) {
$value = substr( $value, 0, 256 );
$encValue = $this->encodeRequestLogValue( $value ) . '[...]';
} else {
$encValue = $this->encodeRequestLogValue( $value );
}
$logCtx['params'][$name] = $value;
$msg .= " {$name}={$encValue}";
}
// Log an unstructured message to the api channel.
wfDebugLog( 'api', $msg, 'private' );
// The api-request channel a structured data log channel.
wfDebugLog( 'api-request', '', 'private', $logCtx );
}
/**
* Encode a value in a format suitable for a space-separated log line.
* @param string $s
* @return string
*/
protected function encodeRequestLogValue( $s ) {
static $table = [];
if ( !$table ) {
$chars = ';@$!*(),/:';
$numChars = strlen( $chars );
for ( $i = 0; $i < $numChars; $i++ ) {
$table[rawurlencode( $chars[$i] )] = $chars[$i];
}
}
return strtr( rawurlencode( $s ), $table );
}
/**
* Get the request parameters used in the course of the preceding execute() request
* @return array
*/
protected function getParamsUsed() {
return array_keys( $this->mParamsUsed );
}
/**
* Mark parameters as used
* @param string|string[] $params
*/
public function markParamsUsed( $params ) {
$this->mParamsUsed += array_fill_keys( (array)$params, true );
}
/**
* Get the request parameters that should be considered sensitive
* @since 1.29
* @return array
*/
protected function getSensitiveParams() {
return array_keys( $this->mParamsSensitive );
}
/**
* Mark parameters as sensitive
*
* This is called automatically for you when declaring a parameter
* with ApiBase::PARAM_SENSITIVE.
*
* @since 1.29
* @param string|string[] $params
*/
public function markParamsSensitive( $params ) {
$this->mParamsSensitive += array_fill_keys( (array)$params, true );
}
/**
* Get a request value, and register the fact that it was used, for logging.
* @param string $name
* @param string|null $default
* @return string|null
*/
public function getVal( $name, $default = null ) {
$this->mParamsUsed[$name] = true;
$ret = $this->getRequest()->getVal( $name );
if ( $ret === null ) {
if ( $this->getRequest()->getArray( $name ) !== null ) {
// See T12262 for why we don't just implode( '|', ... ) the
// array.
$this->addWarning( [ 'apiwarn-unsupportedarray', $name ] );
}
$ret = $default;
}
return $ret;
}
/**
* Get a boolean request value, and register the fact that the parameter
* was used, for logging.
* @param string $name
* @return bool
*/
public function getCheck( $name ) {
$this->mParamsUsed[$name] = true;
return $this->getRequest()->getCheck( $name );
}
/**
* Get a request upload, and register the fact that it was used, for logging.
*
* @since 1.21
* @param string $name Parameter name
* @return WebRequestUpload
*/
public function getUpload( $name ) {
$this->mParamsUsed[$name] = true;
return $this->getRequest()->getUpload( $name );
}
/**
* Report unused parameters, so the client gets a hint in case it gave us parameters we don't know,
* for example in case of spelling mistakes or a missing 'g' prefix for generators.
*/
protected function reportUnusedParams() {
$paramsUsed = $this->getParamsUsed();
$allParams = $this->getRequest()->getValueNames();
if ( !$this->mInternalMode ) {
// Printer has not yet executed; don't warn that its parameters are unused
$printerParams = $this->mPrinter->encodeParamName(
array_keys( $this->mPrinter->getFinalParams() ?: [] )
);
$unusedParams = array_diff( $allParams, $paramsUsed, $printerParams );
} else {
$unusedParams = array_diff( $allParams, $paramsUsed );
}
if ( count( $unusedParams ) ) {
$this->addWarning( [
'apierror-unrecognizedparams',
Message::listParam( array_map( 'wfEscapeWikiText', $unusedParams ), 'comma' ),
count( $unusedParams )
] );
}
}
/**
* Print results using the current printer
*
* @param int $httpCode HTTP status code, or 0 to not change
*/
protected function printResult( $httpCode = 0 ) {
if ( $this->getConfig()->get( MainConfigNames::DebugAPI ) !== false ) {
$this->addWarning( 'apiwarn-wgdebugapi' );
}
$printer = $this->mPrinter;
$printer->initPrinter( false );
if ( $httpCode ) {
$printer->setHttpStatus( $httpCode );
}
$printer->execute();
$printer->closePrinter();
}
/**
* @return bool
*/
public function isReadMode() {
return false;
}
/**
* See ApiBase for description.
*
* @return array
*/
public function getAllowedParams() {
return [
'action' => [
ParamValidator::PARAM_DEFAULT => 'help',
ParamValidator::PARAM_TYPE => 'submodule',
],
'format' => [
ParamValidator::PARAM_DEFAULT => self::API_DEFAULT_FORMAT,
ParamValidator::PARAM_TYPE => 'submodule',
],
'maxlag' => [
ParamValidator::PARAM_TYPE => 'integer'
],
'smaxage' => [
ParamValidator::PARAM_TYPE => 'integer',
ParamValidator::PARAM_DEFAULT => 0,
IntegerDef::PARAM_MIN => 0,
],
'maxage' => [
ParamValidator::PARAM_TYPE => 'integer',
ParamValidator::PARAM_DEFAULT => 0,
IntegerDef::PARAM_MIN => 0,
],
'assert' => [
ParamValidator::PARAM_TYPE => [ 'anon', 'user', 'bot' ]
],
'assertuser' => [
ParamValidator::PARAM_TYPE => 'user',
UserDef::PARAM_ALLOWED_USER_TYPES => [ 'name', 'temp' ],
],
'requestid' => null,
'servedby' => false,
'curtimestamp' => false,
'responselanginfo' => false,
'origin' => null,
'uselang' => [
ParamValidator::PARAM_DEFAULT => self::API_DEFAULT_USELANG,
],
'variant' => null,
'errorformat' => [
ParamValidator::PARAM_TYPE => [ 'plaintext', 'wikitext', 'html', 'raw', 'none', 'bc' ],
ParamValidator::PARAM_DEFAULT => 'bc',
ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
],
'errorlang' => [
ParamValidator::PARAM_DEFAULT => 'uselang',
],
'errorsuselocal' => [
ParamValidator::PARAM_DEFAULT => false,
],
];
}
/** @inheritDoc */
protected function getExamplesMessages() {
return [
'action=help'
=> 'apihelp-help-example-main',
'action=help&recursivesubmodules=1'
=> 'apihelp-help-example-recursive',
];
}
/**
* @inheritDoc
* @phan-param array{nolead?:bool,headerlevel?:int,tocnumber?:int[]} $options
*/
public function modifyHelp( array &$help, array $options, array &$tocData ) {
// Wish PHP had an "array_insert_before". Instead, we have to manually
// reindex the array to get 'permissions' in the right place.
$oldHelp = $help;
$help = [];
foreach ( $oldHelp as $k => $v ) {
if ( $k === 'submodules' ) {
$help['permissions'] = '';
}
$help[$k] = $v;
}
$help['datatypes'] = '';
$help['templatedparams'] = '';
$help['credits'] = '';
// Fill 'permissions'
$help['permissions'] .= Html::openElement( 'div',
[ 'class' => [ 'apihelp-block', 'apihelp-permissions' ] ] );
$m = $this->msg( 'api-help-permissions' );
if ( !$m->isDisabled() ) {
$help['permissions'] .= Html::rawElement( 'div', [ 'class' => 'apihelp-block-head' ],
$m->numParams( count( self::RIGHTS_MAP ) )->parse()
);
}
$help['permissions'] .= Html::openElement( 'dl' );
// TODO inject stuff, see T265644
$groupPermissionsLookup = MediaWikiServices::getInstance()->getGroupPermissionsLookup();
foreach ( self::RIGHTS_MAP as $right => $rightMsg ) {
$help['permissions'] .= Html::element( 'dt', [], $right );
$rightMsg = $this->msg( $rightMsg['msg'], $rightMsg['params'] )->parse();
$help['permissions'] .= Html::rawElement( 'dd', [], $rightMsg );
$groups = array_map( static function ( $group ) {
return $group == '*' ? 'all' : $group;
}, $groupPermissionsLookup->getGroupsWithPermission( $right ) );
$help['permissions'] .= Html::rawElement( 'dd', [],
$this->msg( 'api-help-permissions-granted-to' )
->numParams( count( $groups ) )
->params( Message::listParam( $groups ) )
->parse()
);
}
$help['permissions'] .= Html::closeElement( 'dl' );
$help['permissions'] .= Html::closeElement( 'div' );
// Fill 'datatypes', 'templatedparams', and 'credits', if applicable
if ( empty( $options['nolead'] ) ) {
// @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset Must set when nolead is not set
$level = $options['headerlevel'];
// @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset Must set when nolead is not set
$tocnumber = &$options['tocnumber'];
$header = $this->msg( 'api-help-datatypes-header' )->parse();
$headline = Html::rawElement(
'h' . min( 6, $level ),
[ 'class' => 'apihelp-header', 'id' => 'main/datatypes' ],
$header
);
$help['datatypes'] .= $headline;
$help['datatypes'] .= $this->msg( 'api-help-datatypes-top' )->parseAsBlock();
$help['datatypes'] .= '<dl>';
foreach ( $this->getParamValidator()->knownTypes() as $type ) {
$m = $this->msg( "api-help-datatype-$type" );
if ( !$m->isDisabled() ) {
$help['datatypes'] .= Html::element( 'dt', [ 'id' => "main/datatype/$type" ], $type );
$help['datatypes'] .= Html::rawElement( 'dd', [], $m->parseAsBlock() );
}
}
$help['datatypes'] .= '</dl>';
if ( !isset( $tocData['main/datatypes'] ) ) {
$tocnumber[$level]++;
$tocData['main/datatypes'] = [
'toclevel' => count( $tocnumber ),
'level' => $level,
'anchor' => 'main/datatypes',
'line' => $header,
'number' => implode( '.', $tocnumber ),
'index' => '',
];
}
$header = $this->msg( 'api-help-templatedparams-header' )->parse();
$headline = Html::rawElement(
'h' . min( 6, $level ),
[ 'class' => 'apihelp-header', 'id' => 'main/templatedparams' ],
$header
);
$help['templatedparams'] .= $headline;
$help['templatedparams'] .= $this->msg( 'api-help-templatedparams' )->parseAsBlock();
if ( !isset( $tocData['main/templatedparams'] ) ) {
$tocnumber[$level]++;
$tocData['main/templatedparams'] = [
'toclevel' => count( $tocnumber ),
'level' => $level,
'anchor' => 'main/templatedparams',
'line' => $header,
'number' => implode( '.', $tocnumber ),
'index' => '',
];
}
$header = $this->msg( 'api-credits-header' )->parse();
$headline = Html::rawElement(
'h' . min( 6, $level ),
[ 'class' => 'apihelp-header', 'id' => 'main/credits' ],
$header
);
$help['credits'] .= $headline;
$help['credits'] .= $this->msg( 'api-credits' )->useDatabase( false )->parseAsBlock();
if ( !isset( $tocData['main/credits'] ) ) {
$tocnumber[$level]++;
$tocData['main/credits'] = [
'toclevel' => count( $tocnumber ),
'level' => $level,
'anchor' => 'main/credits',
'line' => $header,
'number' => implode( '.', $tocnumber ),
'index' => '',
];
}
}
}
/** @var bool|null */
private $mCanApiHighLimits = null;
/**
* Check whether the current user is allowed to use high limits
* @return bool
*/
public function canApiHighLimits() {
if ( !isset( $this->mCanApiHighLimits ) ) {
$this->mCanApiHighLimits = $this->getAuthority()->isAllowed( 'apihighlimits' );
}
return $this->mCanApiHighLimits;
}
/**
* Overrides to return this instance's module manager.
* @return ApiModuleManager
*/
public function getModuleManager() {
return $this->mModuleMgr;
}
/**
* Fetches the user agent used for this request
*
* This returns the value of the 'Api-User-Agent' header, if any,
* or the standard User-Agent header, otherwise.
*
* @return string
*/
public function getUserAgent() {
$agent = (string)$this->getRequest()->getHeader( 'Api-user-agent' );
if ( $agent == '' ) {
$agent = $this->getRequest()->getHeader( 'User-agent' );
}
return $agent;
}
}
/**
* For really cool vim folding this needs to be at the end:
* vim: foldmarker=@{,@} foldmethod=marker
*/
/** @deprecated class alias since 1.43 */
class_alias( ApiMain::class, 'ApiMain' );

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