mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/AbuseFilter.git
synced 2024-11-15 02:03:53 +00:00
e64049c30b
Introduce a clear distinction between internal exceptions and user-visible exceptions, leaving AFPException as base abstract class. Later, it should be possible to narrow some types around, e.g. in ParserStatus (that might work with user-visible exceptions only). Also a future TODO is putting all the exceptions in their own namespace (probably ...\Parser\Exception). Change-Id: I4e33a45117f0a3e73af03cc1e3f2734beaf2b5e1
463 lines
14 KiB
PHP
463 lines
14 KiB
PHP
<?php
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namespace MediaWiki\Extension\AbuseFilter\Variables;
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use ContentHandler;
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use Diff;
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use Language;
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use MediaWiki\Extension\AbuseFilter\Hooks\AbuseFilterHookRunner;
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use MediaWiki\Extension\AbuseFilter\Parser\AFPData;
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use MediaWiki\Extension\AbuseFilter\TextExtractor;
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use MediaWiki\Storage\RevisionLookup;
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use MediaWiki\Storage\RevisionStore;
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use MWException;
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use Parser;
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use ParserOptions;
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use Psr\Log\LoggerInterface;
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use stdClass;
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use StringUtils;
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use TextContent;
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use Title;
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use UnifiedDiffFormatter;
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use User;
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use WANObjectCache;
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use Wikimedia\Rdbms\Database;
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use Wikimedia\Rdbms\ILoadBalancer;
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use WikiPage;
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/**
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* Service used to compute lazy-loaded variable.
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* @internal
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*/
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class LazyVariableComputer {
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public const SERVICE_NAME = 'AbuseFilterLazyVariableComputer';
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/**
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* @var float The amount of time to subtract from profiling
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* @todo This is a hack
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*/
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public static $profilingExtraTime = 0;
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/** @var TextExtractor */
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private $textExtractor;
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/** @var AbuseFilterHookRunner */
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private $hookRunner;
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/** @var LoggerInterface */
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private $logger;
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/** @var ILoadBalancer */
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private $loadBalancer;
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/** @var WANObjectCache */
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private $wanCache;
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/** @var RevisionLookup */
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private $revisionLookup;
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/** @var RevisionStore */
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private $revisionStore;
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/** @var Language */
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private $contentLanguage;
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/** @var Parser */
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private $parser;
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/** @var string */
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private $wikiID;
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/**
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* @param TextExtractor $textExtractor
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* @param AbuseFilterHookRunner $hookRunner
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* @param LoggerInterface $logger
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* @param ILoadBalancer $loadBalancer
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* @param WANObjectCache $wanCache
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* @param RevisionLookup $revisionLookup
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* @param RevisionStore $revisionStore
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* @param Language $contentLanguage
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* @param Parser $parser
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* @param string $wikiID
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*/
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public function __construct(
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TextExtractor $textExtractor,
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AbuseFilterHookRunner $hookRunner,
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LoggerInterface $logger,
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ILoadBalancer $loadBalancer,
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WANObjectCache $wanCache,
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RevisionLookup $revisionLookup,
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RevisionStore $revisionStore,
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Language $contentLanguage,
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Parser $parser,
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string $wikiID
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) {
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$this->textExtractor = $textExtractor;
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$this->hookRunner = $hookRunner;
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$this->logger = $logger;
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$this->loadBalancer = $loadBalancer;
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$this->wanCache = $wanCache;
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$this->revisionLookup = $revisionLookup;
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$this->revisionStore = $revisionStore;
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$this->contentLanguage = $contentLanguage;
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$this->parser = $parser;
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$this->wikiID = $wikiID;
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}
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/**
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* XXX: $getVarCB is a hack to hide the cyclic dependency with VariablesManager. See T261069 for possible
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* solutions. This might also be merged into VariablesManager, but it would bring a ton of dependencies.
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* @todo Should we remove $vars parameter (check hooks)?
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*
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* @param LazyLoadedVariable $var
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* @param VariableHolder $vars
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* @param callable $getVarCB
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* @phan-param callable(string $name):AFPData $getVarCB
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* @return AFPData
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* @throws MWException
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*/
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public function compute( LazyLoadedVariable $var, VariableHolder $vars, callable $getVarCB ) {
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$parameters = $var->getParameters();
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$varMethod = $var->getMethod();
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$result = null;
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if ( !$this->hookRunner->onAbuseFilterInterceptVariable(
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$varMethod,
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$vars,
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$parameters,
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$result
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) ) {
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return $result instanceof AFPData
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? $result : AFPData::newFromPHPVar( $result );
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}
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switch ( $varMethod ) {
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case 'diff':
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$text1Var = $parameters['oldtext-var'];
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$text2Var = $parameters['newtext-var'];
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$text1 = $getVarCB( $text1Var )->toString();
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$text2 = $getVarCB( $text2Var )->toString();
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// T74329: if there's no text, don't return an array with the empty string
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$text1 = $text1 === '' ? [] : explode( "\n", $text1 );
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$text2 = $text2 === '' ? [] : explode( "\n", $text2 );
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$diffs = new Diff( $text1, $text2 );
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$format = new UnifiedDiffFormatter();
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$result = $format->format( $diffs );
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break;
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case 'diff-split':
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$diff = $getVarCB( $parameters['diff-var'] )->toString();
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$line_prefix = $parameters['line-prefix'];
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$diff_lines = explode( "\n", $diff );
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$result = [];
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foreach ( $diff_lines as $line ) {
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if ( substr( $line, 0, 1 ) === $line_prefix ) {
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$result[] = substr( $line, strlen( $line_prefix ) );
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}
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}
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break;
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case 'links-from-wikitext':
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// This should ONLY be used when sharing a parse operation with the edit.
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/** @var WikiPage $article */
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$article = $parameters['article'];
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if ( $article->getContentModel() === CONTENT_MODEL_WIKITEXT ) {
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// Shared with the edit, don't count it in profiling
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$startTime = microtime( true );
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$textVar = $parameters['text-var'];
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$new_text = $getVarCB( $textVar )->toString();
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$content = ContentHandler::makeContent( $new_text, $article->getTitle() );
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$editInfo = $article->prepareContentForEdit( $content );
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$result = array_keys( $editInfo->output->getExternalLinks() );
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self::$profilingExtraTime += ( microtime( true ) - $startTime );
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break;
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}
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// Otherwise fall back to database
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case 'links-from-wikitext-or-database':
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// TODO: use Content object instead, if available!
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/** @var WikiPage $article */
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$article = $article ?? $parameters['article'];
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if ( $vars->forFilter ) {
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$links = $this->getLinksFromDB( $article );
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$this->logger->debug( 'Loading old links from DB' );
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} elseif ( $article->getContentModel() === CONTENT_MODEL_WIKITEXT ) {
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$this->logger->debug( 'Loading old links from Parser' );
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$textVar = $parameters['text-var'];
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$wikitext = $getVarCB( $textVar )->toString();
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$editInfo = $this->parseNonEditWikitext(
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$wikitext,
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$article,
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$parameters['contextUser']
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);
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$links = array_keys( $editInfo->output->getExternalLinks() );
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} else {
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// TODO: Get links from Content object. But we don't have the content object.
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// And for non-text content, $wikitext is usually not going to be a valid
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// serialization, but rather some dummy text for filtering.
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$links = [];
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}
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$result = $links;
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break;
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case 'link-diff-added':
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case 'link-diff-removed':
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$oldLinkVar = $parameters['oldlink-var'];
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$newLinkVar = $parameters['newlink-var'];
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$oldLinks = $getVarCB( $oldLinkVar )->toString();
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$newLinks = $getVarCB( $newLinkVar )->toString();
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$oldLinks = explode( "\n", $oldLinks );
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$newLinks = explode( "\n", $newLinks );
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if ( $varMethod === 'link-diff-added' ) {
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$result = array_diff( $newLinks, $oldLinks );
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}
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if ( $varMethod === 'link-diff-removed' ) {
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$result = array_diff( $oldLinks, $newLinks );
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}
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break;
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case 'parse-wikitext':
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// Should ONLY be used when sharing a parse operation with the edit.
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// TODO: use Content object instead, if available!
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/* @var WikiPage $article */
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$article = $parameters['article'];
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if ( $article->getContentModel() === CONTENT_MODEL_WIKITEXT ) {
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// Shared with the edit, don't count it in profiling
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$startTime = microtime( true );
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$textVar = $parameters['wikitext-var'];
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$new_text = $getVarCB( $textVar )->toString();
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$content = ContentHandler::makeContent( $new_text, $article->getTitle() );
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$editInfo = $article->prepareContentForEdit( $content );
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if ( isset( $parameters['pst'] ) && $parameters['pst'] ) {
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$result = $editInfo->pstContent->serialize( $editInfo->format );
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} else {
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$newHTML = $editInfo->output->getText();
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// Kill the PP limit comments. Ideally we'd just remove these by not setting the
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// parser option, but then we can't share a parse operation with the edit, which is bad.
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// @fixme No awfulness scale can measure how awful this hack is.
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$re = '/<!--\s*NewPP limit [^>]*-->\s*(?:<!--\s*Transclusion [^>]+-->\s*)?(?:<\/div>\s*)?$/i';
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$result = preg_replace( $re, '', $newHTML );
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}
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self::$profilingExtraTime += ( microtime( true ) - $startTime );
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} else {
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$result = '';
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}
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break;
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case 'strip-html':
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$htmlVar = $parameters['html-var'];
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$html = $getVarCB( $htmlVar )->toString();
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$stripped = StringUtils::delimiterReplace( '<', '>', '', $html );
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// We strip extra spaces to the right because the stripping above
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// could leave a lot of whitespace.
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// @fixme Find a better way to do this.
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$result = TextContent::normalizeLineEndings( $stripped );
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break;
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case 'load-recent-authors':
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$result = $this->getLastPageAuthors( $parameters['title'] );
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break;
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case 'load-first-author':
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$revision = $this->revisionLookup->getFirstRevision( $parameters['title'] );
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if ( $revision ) {
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$user = $revision->getUser();
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$result = $user === null ? '' : $user->getName();
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} else {
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$result = '';
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}
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break;
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case 'get-page-restrictions':
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$action = $parameters['action'];
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/** @var Title $title */
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$title = $parameters['title'];
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$result = $title->getRestrictions( $action );
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break;
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case 'user-editcount':
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/** @var User $user */
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$user = $parameters['user'];
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$result = $user->getEditCount();
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break;
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case 'user-emailconfirm':
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/** @var User $user */
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$user = $parameters['user'];
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$result = $user->getEmailAuthenticationTimestamp();
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break;
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case 'user-groups':
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/** @var User $user */
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$user = $parameters['user'];
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$result = $user->getEffectiveGroups();
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break;
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case 'user-rights':
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/** @var User $user */
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$user = $parameters['user'];
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$result = $user->getRights();
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break;
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case 'user-block':
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// @todo Support partial blocks?
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/** @var User $user */
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$user = $parameters['user'];
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$result = (bool)$user->getBlock();
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break;
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case 'user-age':
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/** @var User $user */
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$user = $parameters['user'];
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$asOf = $parameters['asof'];
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if ( !$user->isRegistered() ) {
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$result = 0;
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} else {
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$registration = $user->getRegistration();
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// HACK: If there's no registration date, assume 2008-01-15, Wikipedia Day
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// in the year before the new user log was created. See T243469.
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if ( $registration === null ) {
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$registration = "20080115000000";
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}
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$result = (int)wfTimestamp( TS_UNIX, $asOf ) - (int)wfTimestamp( TS_UNIX, $registration );
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}
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break;
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case 'page-age':
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/** @var Title $title */
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$title = $parameters['title'];
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$firstRev = $this->revisionLookup->getFirstRevision( $title );
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$firstRevisionTime = $firstRev ? $firstRev->getTimestamp() : null;
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if ( !$firstRevisionTime ) {
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$result = 0;
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break;
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}
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$asOf = $parameters['asof'];
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$result = (int)wfTimestamp( TS_UNIX, $asOf ) - (int)wfTimestamp( TS_UNIX, $firstRevisionTime );
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break;
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case 'length':
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$s = $getVarCB( $parameters['length-var'] )->toString();
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$result = strlen( $s );
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break;
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case 'subtract-int':
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$v1 = $getVarCB( $parameters['val1-var'] )->toInt();
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$v2 = $getVarCB( $parameters['val2-var'] )->toInt();
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$result = $v1 - $v2;
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break;
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case 'revision-text-by-id':
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$revRec = $this->revisionLookup->getRevisionById( $parameters['revid'] );
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$result = $this->textExtractor->revisionToString( $revRec, $parameters['contextUser'] );
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break;
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case 'get-wiki-name':
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$result = $this->wikiID;
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break;
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case 'get-wiki-language':
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$result = $this->contentLanguage->getCode();
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break;
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default:
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if ( $this->hookRunner->onAbuseFilterComputeVariable(
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$varMethod,
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$vars,
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$parameters,
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$result
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) ) {
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throw new MWException( 'Unknown variable compute type ' . $varMethod );
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}
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}
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// @phan-suppress-next-line SecurityCheck-ReDoS Legit, but that's the intention
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return $result instanceof AFPData ? $result : AFPData::newFromPHPVar( $result );
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}
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/**
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* @param WikiPage $article
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* @return array
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*/
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private function getLinksFromDB( WikiPage $article ) {
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// Stolen from ConfirmEdit, SimpleCaptcha::getLinksFromTracker
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$id = $article->getId();
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if ( !$id ) {
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return [];
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}
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$dbr = $this->loadBalancer->getConnectionRef( DB_REPLICA );
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return $dbr->selectFieldValues(
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'externallinks',
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'el_to',
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[ 'el_from' => $id ],
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__METHOD__
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);
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}
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/**
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* @todo Move to MW core (T272050)
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* @param Title $title
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* @return string[] Usernames of the last 10 (unique) authors from $title
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*/
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private function getLastPageAuthors( Title $title ) {
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if ( !$title->exists() ) {
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return [];
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}
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$fname = __METHOD__;
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return $this->wanCache->getWithSetCallback(
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$this->wanCache->makeKey( 'last-10-authors', 'revision', $title->getLatestRevID() ),
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WANObjectCache::TTL_MINUTE,
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function ( $oldValue, &$ttl, array &$setOpts ) use ( $title, $fname ) {
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$dbr = $this->loadBalancer->getConnectionRef( DB_REPLICA );
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$setOpts += Database::getCacheSetOptions( $dbr );
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// Get the last 100 edit authors with a trivial query (avoid T116557)
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$revQuery = $this->revisionStore->getQueryInfo();
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$revAuthors = $dbr->selectFieldValues(
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$revQuery['tables'],
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$revQuery['fields']['rev_user_text'],
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[ 'rev_page' => $title->getArticleID() ],
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$fname,
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// Some pages have < 10 authors but many revisions (e.g. bot pages)
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[ 'ORDER BY' => 'rev_timestamp DESC, rev_id DESC',
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'LIMIT' => 100,
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// Force index per T116557
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'USE INDEX' => [ 'revision' => 'page_timestamp' ],
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],
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$revQuery['joins']
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);
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// Get the last 10 distinct authors within this set of edits
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$users = [];
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foreach ( $revAuthors as $author ) {
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$users[$author] = 1;
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if ( count( $users ) >= 10 ) {
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break;
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}
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}
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return array_keys( $users );
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}
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);
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}
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/**
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* It's like Article::prepareContentForEdit, but not for editing (old wikitext usually)
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*
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*
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* @param string $wikitext
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* @param WikiPage $article
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* @param User $user Context user
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*
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* @return stdClass
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*/
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private function parseNonEditWikitext( $wikitext, WikiPage $article, User $user ) {
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static $cache = [];
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$cacheKey = md5( $wikitext ) . ':' . $article->getTitle()->getPrefixedText();
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if ( isset( $cache[$cacheKey] ) ) {
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return $cache[$cacheKey];
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}
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$edit = (object)[];
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$options = ParserOptions::newFromUser( $user );
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$edit->output = $this->parser->parse( $wikitext, $article->getTitle(), $options );
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$cache[$cacheKey] = $edit;
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return $edit;
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}
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}
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