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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
+ */
+
+use MediaWiki\Logger\LoggerFactory;
+use MediaWiki\MediaWikiServices;
+use Wikimedia\Timestamp\TimestampException;
+use Wikimedia\Rdbms\DBQueryError;
+use Wikimedia\Rdbms\DBError;
+
+/**
+ * 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 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.
+ *
+ * @ingroup API
+ */
+class ApiMain extends ApiBase {
+ /**
+ * When no format parameter is given, this format will be used
+ */
+ const API_DEFAULT_FORMAT = 'jsonfm';
+
+ /**
+ * When no uselang parameter is given, this language will be used
+ */
+ const API_DEFAULT_USELANG = 'user';
+
+ /**
+ * List of available modules: action name => module class
+ */
+ private static $Modules = [
+ 'login' => ApiLogin::class,
+ 'clientlogin' => ApiClientLogin::class,
+ 'logout' => ApiLogout::class,
+ 'createaccount' => ApiAMCreateAccount::class,
+ 'linkaccount' => ApiLinkAccount::class,
+ 'unlinkaccount' => ApiRemoveAuthenticationData::class,
+ 'changeauthenticationdata' => ApiChangeAuthenticationData::class,
+ 'removeauthenticationdata' => ApiRemoveAuthenticationData::class,
+ 'resetpassword' => ApiResetPassword::class,
+ 'query' => ApiQuery::class,
+ 'expandtemplates' => ApiExpandTemplates::class,
+ 'parse' => ApiParse::class,
+ 'stashedit' => ApiStashEdit::class,
+ 'opensearch' => ApiOpenSearch::class,
+ 'feedcontributions' => ApiFeedContributions::class,
+ 'feedrecentchanges' => ApiFeedRecentChanges::class,
+ 'feedwatchlist' => ApiFeedWatchlist::class,
+ 'help' => ApiHelp::class,
+ 'paraminfo' => ApiParamInfo::class,
+ 'rsd' => ApiRsd::class,
+ 'compare' => ApiComparePages::class,
+ 'tokens' => ApiTokens::class,
+ 'checktoken' => ApiCheckToken::class,
+ 'cspreport' => ApiCSPReport::class,
+ 'validatepassword' => ApiValidatePassword::class,
+
+ // Write modules
+ 'purge' => ApiPurge::class,
+ 'setnotificationtimestamp' => ApiSetNotificationTimestamp::class,
+ 'rollback' => ApiRollback::class,
+ 'delete' => ApiDelete::class,
+ 'undelete' => ApiUndelete::class,
+ 'protect' => ApiProtect::class,
+ 'block' => ApiBlock::class,
+ 'unblock' => ApiUnblock::class,
+ 'move' => ApiMove::class,
+ 'edit' => ApiEditPage::class,
+ 'upload' => ApiUpload::class,
+ 'filerevert' => ApiFileRevert::class,
+ 'emailuser' => ApiEmailUser::class,
+ 'watch' => ApiWatch::class,
+ 'patrol' => ApiPatrol::class,
+ 'import' => ApiImport::class,
+ 'clearhasmsg' => ApiClearHasMsg::class,
+ 'userrights' => ApiUserrights::class,
+ 'options' => ApiOptions::class,
+ 'imagerotate' => ApiImageRotate::class,
+ 'revisiondelete' => ApiRevisionDelete::class,
+ 'managetags' => ApiManageTags::class,
+ 'tag' => ApiTag::class,
+ 'mergehistory' => ApiMergeHistory::class,
+ 'setpagelanguage' => ApiSetPageLanguage::class,
+ ];
+
+ /**
+ * List of available formats: format name => format class
+ */
+ private static $Formats = [
+ 'json' => ApiFormatJson::class,
+ 'jsonfm' => ApiFormatJson::class,
+ 'php' => ApiFormatPhp::class,
+ 'phpfm' => ApiFormatPhp::class,
+ 'xml' => ApiFormatXml::class,
+ 'xmlfm' => ApiFormatXml::class,
+ 'rawfm' => ApiFormatJson::class,
+ 'none' => ApiFormatNone::class,
+ ];
+
+ /**
+ * List of user roles that are specifically relevant to the API.
+ * [ 'right' => [ 'msg' => 'Some message with a $1',
+ * 'params' => [ $someVarToSubst ] ],
+ * ];
+ */
+ private static $mRights = [
+ 'writeapi' => [
+ 'msg' => 'right-writeapi',
+ 'params' => []
+ ],
+ 'apihighlimits' => [
+ 'msg' => 'api-help-right-apihighlimits',
+ 'params' => [ ApiBase::LIMIT_SML2, ApiBase::LIMIT_BIG2 ]
+ ]
+ ];
+
+ /**
+ * @var ApiFormatBase
+ */
+ private $mPrinter;
+
+ private $mModuleMgr, $mResult, $mErrorFormatter = null;
+ /** @var ApiContinuationManager|null */
+ private $mContinuationManager;
+ private $mAction;
+ private $mEnableWrite;
+ private $mInternalMode, $mSquidMaxage;
+ /** @var ApiBase */
+ private $mModule;
+
+ private $mCacheMode = 'private';
+ private $mCacheControl = [];
+ private $mParamsUsed = [];
+ private $mParamsSensitive = [];
+
+ /** @var bool|null Cached return value from self::lacksSameOriginSecurity() */
+ private $lacksSameOriginSecurity = null;
+
+ /**
+ * Constructs an instance of ApiMain that utilizes the module and format specified by $request.
+ *
+ * @param IContextSource|WebRequest $context If this is an instance of
+ * FauxRequest, errors are thrown and no printing occurs
+ * @param bool $enableWrite Should be set to true if the api may modify data
+ */
+ public function __construct( $context = null, $enableWrite = false ) {
+ 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
+ $this->setContext( new DerivativeContext( $context ) );
+
+ if ( isset( $request ) ) {
+ $this->getContext()->setRequest( $request );
+ } else {
+ $request = $this->getRequest();
+ }
+
+ $this->mInternalMode = ( $request instanceof FauxRequest );
+
+ // Special handling for the main module: $parent === $this
+ parent::__construct( $this, $this->mInternalMode ? 'main_int' : 'main' );
+
+ $config = $this->getConfig();
+
+ if ( !$this->mInternalMode ) {
+ // Log if a request with a non-whitelisted Origin header is seen
+ // with session cookies.
+ $originHeader = $request->getHeader( 'Origin' );
+ if ( $originHeader === false ) {
+ $origins = [];
+ } else {
+ $originHeader = trim( $originHeader );
+ $origins = preg_split( '/\s+/', $originHeader );
+ }
+ $sessionCookies = array_intersect(
+ array_keys( $_COOKIE ),
+ MediaWiki\Session\SessionManager::singleton()->getVaryCookies()
+ );
+ if ( $origins && $sessionCookies && (
+ count( $origins ) !== 1 || !self::matchOrigin(
+ $origins[0],
+ $config->get( 'CrossSiteAJAXdomains' ),
+ $config->get( 'CrossSiteAJAXdomainExceptions' )
+ )
+ ) ) {
+ LoggerFactory::getInstance( 'cors' )->warning(
+ 'Non-whitelisted CORS request with session cookies', [
+ 'origin' => $originHeader,
+ 'cookies' => $sessionCookies,
+ 'ip' => $request->getIP(),
+ 'userAgent' => $this->getUserAgent(),
+ 'wiki' => wfWikiID(),
+ ]
+ );
+ }
+
+ // If we're in a mode that breaks the same-origin policy, strip
+ // user credentials for security.
+ if ( $this->lacksSameOriginSecurity() ) {
+ global $wgUser;
+ wfDebug( "API: stripping user credentials when the same-origin policy is not applied\n" );
+ $wgUser = new User();
+ $this->getContext()->setUser( $wgUser );
+ $request->response()->header( 'MediaWiki-Login-Suppressed: true' );
+ }
+ }
+
+ $this->mResult = new ApiResult( $this->getConfig()->get( 'APIMaxResultSize' ) );
+
+ // Setup uselang. This doesn't use $this->getParameter()
+ // because we're not ready to handle errors yet.
+ $uselang = $request->getVal( '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' ) {
+ global $wgContLang;
+ $uselang = $wgContLang->getCode();
+ }
+ $code = RequestContext::sanitizeLangCode( $uselang );
+ $this->getContext()->setLanguage( $code );
+ if ( !$this->mInternalMode ) {
+ global $wgLang;
+ $wgLang = $this->getContext()->getLanguage();
+ RequestContext::getMain()->setLanguage( $wgLang );
+ }
+ }
+
+ // Set up the error formatter. This doesn't use $this->getParameter()
+ // because we're not ready to handle errors yet.
+ $errorFormat = $request->getVal( 'errorformat', 'bc' );
+ $errorLangCode = $request->getVal( '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' ) {
+ global $wgContLang;
+ $errorLang = $wgContLang;
+ } else {
+ $errorLangCode = RequestContext::sanitizeLangCode( $errorLangCode );
+ $errorLang = Language::factory( $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 );
+ $this->mModuleMgr->addModules( self::$Modules, 'action' );
+ $this->mModuleMgr->addModules( $config->get( 'APIModules' ), 'action' );
+ $this->mModuleMgr->addModules( self::$Formats, 'format' );
+ $this->mModuleMgr->addModules( $config->get( 'APIFormatModules' ), 'format' );
+
+ Hooks::run( 'ApiMain::moduleManager', [ $this->mModuleMgr ] );
+
+ $this->mContinuationManager = null;
+ $this->mEnableWrite = $enableWrite;
+
+ $this->mSquidMaxage = -1; // flag for executeActionWithErrorHandling()
+ $this->mCommit = false;
+ }
+
+ /**
+ * Return true if the API was started by other PHP code using 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->getVal( 'callback' ) !== null ) {
+ $this->lacksSameOriginSecurity = true;
+ return true;
+ }
+
+ // Anonymous CORS
+ if ( $request->getVal( 'origin' ) === '*' ) {
+ $this->lacksSameOriginSecurity = true;
+ return true;
+ }
+
+ // Header to be used from XMLHTTPRequest when the request might
+ // otherwise be used for XSS.
+ if ( $request->getHeader( 'Treat-as-Untrusted' ) !== false ) {
+ $this->lacksSameOriginSecurity = true;
+ return true;
+ }
+
+ // Allow extensions to override.
+ $this->lacksSameOriginSecurity = !Hooks::run( 'RequestHasSameOriginSecurity', [ $request ] );
+ return $this->lacksSameOriginSecurity;
+ }
+
+ /**
+ * Get the ApiErrorFormatter object associated with current request
+ * @return ApiErrorFormatter
+ */
+ public function getErrorFormatter() {
+ return $this->mErrorFormatter;
+ }
+
+ /**
+ * Get the continuation manager
+ * @return ApiContinuationManager|null
+ */
+ public function getContinuationManager() {
+ return $this->mContinuationManager;
+ }
+
+ /**
+ * Set the continuation manager
+ * @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 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\"\n" );
+
+ // Ignore for forwards-compatibility
+ return;
+ }
+
+ if ( !User::isEveryoneAllowed( 'read' ) ) {
+ // Private wiki, only private headers
+ if ( $mode !== 'private' ) {
+ wfDebug( __METHOD__ . ": ignoring request for $mode cache mode, private wiki\n" );
+
+ 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\n" );
+ $mode = 'anon-public-user-private';
+ }
+
+ wfDebug( __METHOD__ . ": setting cache mode $mode\n" );
+ $this->mCacheMode = $mode;
+ }
+
+ /**
+ * 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' );
+ if ( $printer === null ) {
+ $this->dieWithError(
+ [ 'apierror-unknownformat', wfEscapeWikiText( $format ) ], 'unknown_format'
+ );
+ }
+
+ 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 );
+ if ( $this->mModule->isWriteMode() && $this->getRequest()->wasPosted() ) {
+ MediaWikiServices::getInstance()->getStatsdDataFactory()->timing(
+ 'api.' . $this->mModule->getModuleName() . '.executeTiming', 1000 * $runTime
+ );
+ }
+ } catch ( Exception $e ) {
+ $this->handleException( $e );
+ $this->logRequest( microtime( true ) - $t, $e );
+ $isError = true;
+ }
+
+ // 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 an exception as an API response
+ *
+ * @since 1.23
+ * @param Exception $e
+ */
+ protected function handleException( Exception $e ) {
+ // T65145: Rollback any open database transactions
+ if ( !( $e instanceof ApiUsageException || $e instanceof UsageException ) ) {
+ // UsageExceptions are intentional, so don't rollback if that's the case
+ MWExceptionHandler::rollbackMasterChangesAndLog( $e );
+ }
+
+ // Allow extra cleanup and logging
+ Hooks::run( 'ApiMain::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();
+
+ $failed = false;
+ try {
+ $this->printResult( $e->getCode() );
+ } 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()->getErrors() as $error ) {
+ try {
+ $this->mPrinter->addWarning( $error );
+ } catch ( Exception $ex2 ) {
+ // WTF?
+ $this->addWarning( $error );
+ }
+ }
+ } catch ( UsageException $ex ) {
+ // The error printer itself is failing. Try suppressing its request
+ // parameters and redo.
+ $failed = true;
+ $this->addWarning(
+ [ 'apiwarn-errorprinterfailed-ex', $ex->getMessage() ], 'errorprinterfailed'
+ );
+ }
+ if ( $failed ) {
+ $this->mPrinter = null;
+ $this->createErrorPrinter();
+ $this->mPrinter->forceDefaultParams();
+ if ( $e->getCode() ) {
+ $response->statusHeader( 200 ); // Reset in case the fallback doesn't want a non-200
+ }
+ $this->printResult( $e->getCode() );
+ }
+ }
+
+ /**
+ * Handle an exception from the ApiBeforeMain hook.
+ *
+ * This tries to print the exception as an API response, to be more
+ * friendly to clients. If it fails, it will rethrow the exception.
+ *
+ * @since 1.23
+ * @param Exception $e
+ * @throws Exception
+ */
+ public static function handleApiBeforeMainException( Exception $e ) {
+ ob_start();
+
+ try {
+ $main = new self( RequestContext::getMain(), false );
+ $main->handleException( $e );
+ $main->logRequest( 0, $e );
+ } catch ( Exception $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();
+
+ $matchedOrigin = false;
+ $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();
+ $matchedOrigin = count( $origins ) === 1 && self::matchOrigin(
+ $originParam,
+ $config->get( 'CrossSiteAJAXdomains' ),
+ $config->get( 'CrossSiteAJAXdomainExceptions' )
+ );
+
+ $allowOrigin = $originHeader;
+ $allowCredentials = 'true';
+ $allowTiming = $originHeader;
+ }
+
+ if ( $matchedOrigin ) {
+ $requestedMethod = $request->getHeader( 'Access-Control-Request-Method' );
+ $preflight = $request->getMethod() === 'OPTIONS' && $requestedMethod !== false;
+ if ( $preflight ) {
+ // This is a CORS preflight request
+ if ( $requestedMethod !== 'POST' && $requestedMethod !== 'GET' ) {
+ // If method is not a case-sensitive match, do not set any additional headers and terminate.
+ $response->header( 'MediaWiki-CORS-Rejection: Unsupported method requested in preflight' );
+ return true;
+ }
+ // We allow the actual request to send the following headers
+ $requestedHeaders = $request->getHeader( 'Access-Control-Request-Headers' );
+ if ( $requestedHeaders !== false ) {
+ if ( !self::matchRequestedHeaders( $requestedHeaders ) ) {
+ $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 or POST
+ $response->header( 'Access-Control-Allow-Methods: POST, GET' );
+ } elseif ( $request->getMethod() !== 'POST' && $request->getMethod() !== 'GET' ) {
+ // Unsupported non-preflight method, don't handle it as CORS
+ $response->header(
+ 'MediaWiki-CORS-Rejection: Unsupported method for simple request or actual request'
+ );
+ return true;
+ }
+
+ $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 match an Origin header against a set of rules and a set of exceptions
+ * @param string $value Origin header
+ * @param array $rules Set of wildcard rules
+ * @param array $exceptions Set of wildcard rules
+ * @return bool True if $value matches a rule in $rules and doesn't match
+ * any rules in $exceptions, false otherwise
+ */
+ protected static function matchOrigin( $value, $rules, $exceptions ) {
+ foreach ( $rules as $rule ) {
+ if ( preg_match( self::wildcardToRegex( $rule ), $value ) ) {
+ // Rule matches, check exceptions
+ foreach ( $exceptions as $exc ) {
+ if ( preg_match( self::wildcardToRegex( $exc ), $value ) ) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ /**
+ * 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 seperated list of HTTP headers
+ * @return bool True if all requested headers are in the list of allowed headers
+ */
+ protected static function matchRequestedHeaders( $requestedHeaders ) {
+ if ( trim( $requestedHeaders ) === '' ) {
+ return true;
+ }
+ $requestedHeaders = explode( ',', $requestedHeaders );
+ $allowedAuthorHeaders = array_flip( [
+ /* simple headers (see spec) */
+ 'accept',
+ 'accept-language',
+ 'content-language',
+ 'content-type',
+ /* non-authorable headers in XHR, which are however requested by some UAs */
+ 'accept-encoding',
+ 'dnt',
+ 'origin',
+ /* MediaWiki whitelist */
+ 'api-user-agent',
+ ] );
+ foreach ( $requestedHeaders as $rHeader ) {
+ $rHeader = strtolower( trim( $rHeader ) );
+ if ( !isset( $allowedAuthorHeaders[$rHeader] ) ) {
+ wfDebugLog( 'api', 'CORS preflight failed on requested header: ' . $rHeader );
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Helper function to convert wildcard string into a regex
+ * '*' => '.*?'
+ * '?' => '.'
+ *
+ * @param string $wildcard String with wildcards
+ * @return string Regular expression
+ */
+ protected static function wildcardToRegex( $wildcard ) {
+ $wildcard = preg_quote( $wildcard, '/' );
+ $wildcard = str_replace(
+ [ '\*', '\?' ],
+ [ '.*?', '.' ],
+ $wildcard
+ );
+
+ return "/^https?:\/\/$wildcard$/";
+ }
+
+ /**
+ * 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( '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 ( ( $this->mModule && !$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;
+ }
+
+ $useKeyHeader = $config->get( 'UseKeyHeader' );
+ if ( $this->mCacheMode == 'anon-public-user-private' ) {
+ $out->addVaryHeader( 'Cookie' );
+ $response->header( $out->getVaryHeader() );
+ if ( $useKeyHeader ) {
+ $response->header( $out->getKeyHeader() );
+ if ( $out->haveCacheVaryCookies() ) {
+ // Logged in, mark this request private
+ $response->header( "Cache-Control: $privateCache" );
+ return;
+ }
+ // Logged out, send normal public headers below
+ } elseif ( MediaWiki\Session\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 no Key and anonymous, send public headers below
+ }
+
+ // Send public headers
+ $response->header( $out->getVaryHeader() );
+ if ( $useKeyHeader ) {
+ $response->header( $out->getKeyHeader() );
+ }
+
+ // 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;
+ }
+ $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 exception.
+ *
+ * If an ApiUsageException, errors/warnings will be extracted from the
+ * embedded StatusValue.
+ *
+ * If a base UsageException, the getMessageArray() method will be used to
+ * extract the code and English message for a single error (no warnings).
+ *
+ * Any other exception will be returned with a generic code and wrapper
+ * text around the exception's (presumably English) message as a single
+ * error (no warnings).
+ *
+ * @param Exception $e
+ * @param string $type 'error' or 'warning'
+ * @return ApiMessage[]
+ * @since 1.27
+ */
+ protected function errorMessagesFromException( $e, $type = 'error' ) {
+ $messages = [];
+ if ( $e instanceof ApiUsageException ) {
+ foreach ( $e->getStatusValue()->getErrorsByType( $type ) as $error ) {
+ $messages[] = ApiMessage::create( $error );
+ }
+ } elseif ( $type !== 'error' ) {
+ // None of the rest have any messages for non-error types
+ } elseif ( $e instanceof UsageException ) {
+ // User entered incorrect parameters - generate error response
+ $data = Wikimedia\quietCall( [ $e, 'getMessageArray' ] );
+ $code = $data['code'];
+ $info = $data['info'];
+ unset( $data['code'], $data['info'] );
+ $messages[] = new ApiRawMessage( [ '$1', $info ], $code, $data );
+ } else {
+ // Something is seriously wrong
+ $config = $this->getConfig();
+ $class = preg_replace( '#^Wikimedia\\\Rdbms\\\#', '', get_class( $e ) );
+ $code = 'internal_api_error_' . $class;
+ if ( ( $e instanceof DBQueryError ) && !$config->get( 'ShowSQLErrors' ) ) {
+ $params = [ 'apierror-databaseerror', WebRequest::getRequestId() ];
+ } else {
+ 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 ];
+ }
+ $messages[] = ApiMessage::create( $params, $code );
+ }
+ return $messages;
+ }
+
+ /**
+ * Replace the result data with the information about an exception.
+ * @param Exception $e
+ * @return string[] Error codes
+ */
+ protected function substituteResultWithError( $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 ) {
+ $errorCodes[$msg->getApiCode()] = 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 || $e instanceof UsageException ) {
+ $link = wfExpandUrl( 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()
+ )
+ );
+ } else {
+ if ( $config->get( 'ShowExceptionDetails' ) &&
+ ( !$e instanceof DBError || $config->get( 'ShowDBErrorBacktrace' ) )
+ ) {
+ $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( '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, time() ),
+ 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 MWException
+ * @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 ( $module->needsToken() === true ) {
+ throw new MWException(
+ "Module '{$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 MWException(
+ "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' );
+ }
+ }
+
+ return $module;
+ }
+
+ /**
+ * @return array
+ */
+ private function getMaxLag() {
+ $dbLag = MediaWikiServices::getInstance()->getDBLoadBalancer()->getMaxLag();
+ $lagInfo = [
+ 'host' => $dbLag[0],
+ 'lag' => $dbLag[1],
+ 'type' => 'db'
+ ];
+
+ $jobQueueLagFactor = $this->getConfig()->get( 'JobQueueIncludeInMaxLagFactor' );
+ if ( $jobQueueLagFactor ) {
+ // Turn total number of jobs into seconds by using the configured value
+ $totalJobs = array_sum( JobQueueGroup::singleton()->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,
+ ];
+ }
+ }
+
+ 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( intval( $maxLag ), 5 ) );
+ $response->header( 'X-Database-Lag: ' . intval( $lagInfo['lag'] ) );
+
+ if ( $this->getConfig()->get( '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 ) {
+ if ( $ifNoneMatch === [ '*' ] ) {
+ // API responses always "exist"
+ $etag = '*';
+ } else {
+ $etag = $module->getConditionalRequestData( 'etag' );
+ }
+ }
+ if ( $ifNoneMatch && $etag !== null ) {
+ $test = substr( $etag, 0, 2 ) === 'W/' ? substr( $etag, 2 ) : $etag;
+ $match = array_map( function ( $s ) {
+ return substr( $s, 0, 2 ) === '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
+ ) {
+ $lastMod = $module->getConditionalRequestData( 'last-modified' );
+ if ( $lastMod !== null ) {
+ // Mix in some MediaWiki modification times
+ $modifiedTimes = [
+ 'page' => $lastMod,
+ 'user' => $this->getUser()->getTouched(),
+ 'epoch' => $this->getConfig()->get( 'CacheEpoch' ),
+ ];
+ if ( $this->getConfig()->get( 'UseSquid' ) ) {
+ // T46570: the core page itself may not change, but resources might
+ $modifiedTimes['sepoch'] = wfTimestamp(
+ TS_MW, time() - $this->getConfig()->get( 'SquidMaxage' )
+ );
+ }
+ Hooks::run( 'OutputPageCheckLastModified', [ &$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
+ Wikimedia\suppressWarnings();
+ ini_set( 'zlib.output_compression', 0 );
+ Wikimedia\restoreWarnings();
+ wfClearOutputBuffers();
+
+ return false;
+ }
+
+ return true;
+ }
+
+ /**
+ * Check for sufficient permissions to execute
+ * @param ApiBase $module An Api module
+ */
+ protected function checkExecutePermissions( $module ) {
+ $user = $this->getUser();
+ if ( $module->isReadMode() && !User::isEveryoneAllowed( 'read' ) &&
+ !$user->isAllowed( 'read' )
+ ) {
+ $this->dieWithError( 'apierror-readapidenied' );
+ }
+
+ if ( $module->isWriteMode() ) {
+ if ( !$this->mEnableWrite ) {
+ $this->dieWithError( 'apierror-noapiwrite' );
+ } elseif ( !$user->isAllowed( 'writeapi' ) ) {
+ $this->dieWithError( 'apierror-writeapidenied' );
+ } 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.
+ $message = 'hookaborted';
+ if ( !Hooks::run( 'ApiCheckCanExecute', [ $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 ( wfReadOnly() ) {
+ $this->dieReadOnly();
+ }
+
+ if ( $module->isWriteMode()
+ && $this->getUser()->isBot()
+ && MediaWikiServices::getInstance()->getDBLoadBalancer()->getServerCount() > 1
+ ) {
+ $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( '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',
+ "Api request failed as read only because the following DBs are lagged: $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 'user':
+ if ( $user->isAnon() ) {
+ $this->dieWithError( 'apierror-assertuserfailed' );
+ }
+ break;
+ case 'bot':
+ if ( !$user->isAllowed( 'bot' ) ) {
+ $this->dieWithError( 'apierror-assertbotfailed' );
+ }
+ break;
+ }
+ }
+ if ( isset( $params['assertuser'] ) ) {
+ $assertUser = User::newFromName( $params['assertuser'], false );
+ if ( !$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 ) {
+ $request = $this->getRequest();
+ if ( !$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 ] );
+ }
+
+ // See if custom printer is used
+ $this->mPrinter = $module->getCustomPrinter();
+ if ( is_null( $this->mPrinter ) ) {
+ // Create an appropriate printer
+ $this->mPrinter = $this->createPrinterByName( $params['format'] );
+ }
+
+ if ( $request->getProtocol() === 'http' && (
+ $request->getSession()->shouldForceHTTPS() ||
+ ( $this->getUser()->isLoggedIn() &&
+ $this->getUser()->requiresHTTPS() )
+ ) ) {
+ $this->addDeprecation( 'apiwarn-deprecation-httpsexpected', 'https-expected' );
+ }
+ }
+
+ /**
+ * Execute the actual module, without any error handling
+ */
+ protected function executeAction() {
+ $params = $this->setupExecuteAction();
+ $module = $this->setupModule();
+ $this->mModule = $module;
+
+ if ( !$this->mInternalMode ) {
+ $this->setRequestExpectations( $module );
+ }
+
+ $this->checkExecutePermissions( $module );
+
+ if ( !$this->checkMaxLag( $module, $params ) ) {
+ return;
+ }
+
+ if ( !$this->checkConditionalRequestHeaders( $module ) ) {
+ return;
+ }
+
+ if ( !$this->mInternalMode ) {
+ $this->setupExternalResponse( $module, $params );
+ }
+
+ $this->checkAsserts( $params );
+
+ // Execute
+ $module->execute();
+ Hooks::run( 'APIAfterExecute', [ &$module ] );
+
+ $this->reportUnusedParams();
+
+ if ( !$this->mInternalMode ) {
+ // append Debug information
+ MWDebug::appendDebugInfoToApiResult( $this->getContext(), $this->getResult() );
+
+ // Print result data
+ $this->printResult();
+ }
+ }
+
+ /**
+ * Set database connection, query, and write expectations given this module request
+ * @param ApiBase $module
+ */
+ protected function setRequestExpectations( ApiBase $module ) {
+ $limits = $this->getConfig()->get( 'TrxProfilerLimits' );
+ $trxProfiler = Profiler::instance()->getTransactionProfiler();
+ $trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
+ if ( $this->getRequest()->hasSafeMethod() ) {
+ $trxProfiler->setExpectations( $limits['GET'], __METHOD__ );
+ } elseif ( $this->getRequest()->wasPosted() && !$module->isWriteMode() ) {
+ $trxProfiler->setExpectations( $limits['POST-nonwrite'], __METHOD__ );
+ $this->getRequest()->markAsSafeRequest();
+ } else {
+ $trxProfiler->setExpectations( $limits['POST'], __METHOD__ );
+ }
+ }
+
+ /**
+ * Log the preceding request
+ * @param float $time Time in seconds
+ * @param Exception $e Exception caught while processing the request
+ */
+ protected function logRequest( $time, $e = null ) {
+ $request = $this->getRequest();
+ $logCtx = [
+ 'ts' => time(),
+ 'ip' => $request->getIP(),
+ 'userAgent' => $this->getUserAgent(),
+ 'wiki' => wfWikiID(),
+ 'timeSpentBackend' => (int)round( $time * 1000 ),
+ 'hadError' => $e !== null,
+ 'errorCodes' => [],
+ 'params' => [],
+ ];
+
+ if ( $e ) {
+ foreach ( $this->errorMessagesFromException( $e ) as $msg ) {
+ $logCtx['errorCodes'][] = $msg->getApiCode();
+ }
+ }
+
+ // Construct space separated message for 'api' log channel
+ $msg = "API {$request->getMethod()} " .
+ wfUrlencode( str_replace( ' ', '_', $this->getUser()->getName() ) ) .
+ " {$logCtx['ip']} " .
+ "T={$logCtx['timeSpentBackend']}ms";
+
+ $sensitive = array_flip( $this->getSensitiveParams() );
+ 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}";
+ }
+
+ wfDebugLog( 'api', $msg, 'private' );
+ // ApiAction channel is for structured data consumers
+ wfDebugLog( 'ApiAction', '', '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
+ * @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 ) {
+ return $this->getVal( $name, null ) !== null;
+ }
+
+ /**
+ * 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( 'DebugAPI' ) !== false ) {
+ $this->addWarning( 'apiwarn-wgDebugAPI' );
+ }
+
+ $printer = $this->mPrinter;
+ $printer->initPrinter( false );
+ if ( $httpCode ) {
+ $printer->setHttpStatus( $httpCode );
+ }
+ $printer->execute();
+ $printer->closePrinter();
+ }
+
+ /**
+ * @return bool
+ */
+ public function isReadMode() {
+ return false;
+ }
+
+ /**
+ * See ApiBase for description.
+ *
+ * @return array
+ */
+ public function getAllowedParams() {
+ return [
+ 'action' => [
+ ApiBase::PARAM_DFLT => 'help',
+ ApiBase::PARAM_TYPE => 'submodule',
+ ],
+ 'format' => [
+ ApiBase::PARAM_DFLT => self::API_DEFAULT_FORMAT,
+ ApiBase::PARAM_TYPE => 'submodule',
+ ],
+ 'maxlag' => [
+ ApiBase::PARAM_TYPE => 'integer'
+ ],
+ 'smaxage' => [
+ ApiBase::PARAM_TYPE => 'integer',
+ ApiBase::PARAM_DFLT => 0
+ ],
+ 'maxage' => [
+ ApiBase::PARAM_TYPE => 'integer',
+ ApiBase::PARAM_DFLT => 0
+ ],
+ 'assert' => [
+ ApiBase::PARAM_TYPE => [ 'user', 'bot' ]
+ ],
+ 'assertuser' => [
+ ApiBase::PARAM_TYPE => 'user',
+ ],
+ 'requestid' => null,
+ 'servedby' => false,
+ 'curtimestamp' => false,
+ 'responselanginfo' => false,
+ 'origin' => null,
+ 'uselang' => [
+ ApiBase::PARAM_DFLT => self::API_DEFAULT_USELANG,
+ ],
+ 'errorformat' => [
+ ApiBase::PARAM_TYPE => [ 'plaintext', 'wikitext', 'html', 'raw', 'none', 'bc' ],
+ ApiBase::PARAM_DFLT => 'bc',
+ ],
+ 'errorlang' => [
+ ApiBase::PARAM_DFLT => 'uselang',
+ ],
+ 'errorsuselocal' => [
+ ApiBase::PARAM_DFLT => false,
+ ],
+ ];
+ }
+
+ /** @inheritDoc */
+ protected function getExamplesMessages() {
+ return [
+ 'action=help'
+ => 'apihelp-help-example-main',
+ 'action=help&recursivesubmodules=1'
+ => 'apihelp-help-example-recursive',
+ ];
+ }
+
+ public function modifyHelp( array &$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['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' ],
+ $m->numParams( count( self::$mRights ) )->parse()
+ );
+ }
+ $help['permissions'] .= Html::openElement( 'dl' );
+ foreach ( self::$mRights as $right => $rightMsg ) {
+ $help['permissions'] .= Html::element( 'dt', null, $right );
+
+ $rightMsg = $this->msg( $rightMsg['msg'], $rightMsg['params'] )->parse();
+ $help['permissions'] .= Html::rawElement( 'dd', null, $rightMsg );
+
+ $groups = array_map( function ( $group ) {
+ return $group == '*' ? 'all' : $group;
+ }, User::getGroupsWithPermission( $right ) );
+
+ $help['permissions'] .= Html::rawElement( 'dd', null,
+ $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' and 'credits', if applicable
+ if ( empty( $options['nolead'] ) ) {
+ $level = $options['headerlevel'];
+ $tocnumber = &$options['tocnumber'];
+
+ $header = $this->msg( 'api-help-datatypes-header' )->parse();
+
+ $id = Sanitizer::escapeIdForAttribute( 'main/datatypes', Sanitizer::ID_PRIMARY );
+ $idFallback = Sanitizer::escapeIdForAttribute( 'main/datatypes', Sanitizer::ID_FALLBACK );
+ $headline = Linker::makeHeadline( min( 6, $level ),
+ ' class="apihelp-header">',
+ $id,
+ $header,
+ '',
+ $idFallback
+ );
+ // Ensure we have a sane anchor
+ if ( $id !== 'main/datatypes' && $idFallback !== 'main/datatypes' ) {
+ $headline = '<div id="main/datatypes"></div>' . $headline;
+ }
+ $help['datatypes'] .= $headline;
+ $help['datatypes'] .= $this->msg( 'api-help-datatypes' )->parseAsBlock();
+ if ( !isset( $tocData['main/datatypes'] ) ) {
+ $tocnumber[$level]++;
+ $tocData['main/datatypes'] = [
+ 'toclevel' => count( $tocnumber ),
+ 'level' => $level,
+ 'anchor' => 'main/datatypes',
+ 'line' => $header,
+ 'number' => implode( '.', $tocnumber ),
+ 'index' => false,
+ ];
+ }
+
+ $header = $this->msg( 'api-credits-header' )->parse();
+ $id = Sanitizer::escapeIdForAttribute( 'main/credits', Sanitizer::ID_PRIMARY );
+ $idFallback = Sanitizer::escapeIdForAttribute( 'main/credits', Sanitizer::ID_FALLBACK );
+ $headline = Linker::makeHeadline( min( 6, $level ),
+ ' class="apihelp-header">',
+ $id,
+ $header,
+ '',
+ $idFallback
+ );
+ // Ensure we have a sane anchor
+ if ( $id !== 'main/credits' && $idFallback !== 'main/credits' ) {
+ $headline = '<div id="main/credits"></div>' . $headline;
+ }
+ $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' => false,
+ ];
+ }
+ }
+ }
+
+ 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->getUser()->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
+ *
+ * The value will be the combination of the 'Api-User-Agent' header (if
+ * any) and the standard User-Agent header (if any).
+ *
+ * @return string
+ */
+ public function getUserAgent() {
+ return trim(
+ $this->getRequest()->getHeader( 'Api-user-agent' ) . ' ' .
+ $this->getRequest()->getHeader( 'User-agent' )
+ );
+ }
+}
+
+/**
+ * For really cool vim folding this needs to be at the end:
+ * vim: foldmarker=@{,@} foldmethod=marker
+ */
generated by cgit v1.2.1 (git 2.18.0) at 2024-05-05 00:33:08 +0000