mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/AbuseFilter.git
synced 2024-11-15 02:03:53 +00:00
410 lines
13 KiB
PHP
410 lines
13 KiB
PHP
<?php
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namespace MediaWiki\Extension\AbuseFilter;
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use BadMethodCallException;
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use InvalidArgumentException;
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use MediaWiki\Config\ServiceOptions;
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use MediaWiki\Deferred\DeferredUpdatesManager;
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use MediaWiki\Extension\AbuseFilter\ChangeTags\ChangeTagger;
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use MediaWiki\Extension\AbuseFilter\Consequences\ConsequencesExecutorFactory;
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use MediaWiki\Extension\AbuseFilter\Filter\ExistingFilter;
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use MediaWiki\Extension\AbuseFilter\Hooks\AbuseFilterHookRunner;
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use MediaWiki\Extension\AbuseFilter\Parser\FilterEvaluator;
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use MediaWiki\Extension\AbuseFilter\Parser\RuleCheckerFactory;
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use MediaWiki\Extension\AbuseFilter\VariableGenerator\VariableGeneratorFactory;
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use MediaWiki\Extension\AbuseFilter\Variables\LazyVariableComputer;
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use MediaWiki\Extension\AbuseFilter\Variables\VariableHolder;
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use MediaWiki\Extension\AbuseFilter\Variables\VariablesManager;
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use MediaWiki\Extension\AbuseFilter\Watcher\Watcher;
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use MediaWiki\Title\Title;
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use Psr\Log\LoggerInterface;
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use Status;
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use User;
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/**
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* This class contains the logic for executing abuse filters and their actions. The entry points are
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* run() and runForStash(). Note that run() can only be executed once on a given instance.
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* @internal Not stable yet
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*/
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class FilterRunner {
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public const CONSTRUCTOR_OPTIONS = [
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'AbuseFilterValidGroups',
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'AbuseFilterCentralDB',
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'AbuseFilterIsCentral',
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'AbuseFilterConditionLimit',
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];
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/** @var AbuseFilterHookRunner */
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private $hookRunner;
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/** @var FilterProfiler */
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private $filterProfiler;
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/** @var ChangeTagger */
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private $changeTagger;
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/** @var FilterLookup */
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private $filterLookup;
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/** @var RuleCheckerFactory */
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private $ruleCheckerFactory;
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/** @var ConsequencesExecutorFactory */
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private $consExecutorFactory;
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/** @var AbuseLoggerFactory */
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private $abuseLoggerFactory;
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/** @var EmergencyCache */
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private $emergencyCache;
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/** @var Watcher[] */
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private $watchers;
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/** @var EditStashCache */
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private $stashCache;
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/** @var LoggerInterface */
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private $logger;
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/** @var VariablesManager */
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private $varManager;
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/** @var VariableGeneratorFactory */
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private $varGeneratorFactory;
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/** @var ServiceOptions */
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private $options;
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/** @var DeferredUpdatesManager */
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private DeferredUpdatesManager $deferredUpdatesManager;
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/**
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* @var FilterEvaluator
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*/
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private $ruleChecker;
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/**
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* @var User The user who performed the action being filtered
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*/
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private $user;
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/**
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* @var Title The title where the action being filtered was performed
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*/
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private $title;
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/**
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* @var VariableHolder The variables for the current action
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*/
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private $vars;
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/**
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* @var string The group of filters to check (as defined in $wgAbuseFilterValidGroups)
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*/
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private $group;
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/**
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* @var string The action we're filtering
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*/
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private $action;
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/**
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* @param AbuseFilterHookRunner $hookRunner
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* @param FilterProfiler $filterProfiler
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* @param ChangeTagger $changeTagger
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* @param FilterLookup $filterLookup
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* @param RuleCheckerFactory $ruleCheckerFactory
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* @param ConsequencesExecutorFactory $consExecutorFactory
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* @param AbuseLoggerFactory $abuseLoggerFactory
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* @param VariablesManager $varManager
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* @param VariableGeneratorFactory $varGeneratorFactory
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* @param EmergencyCache $emergencyCache
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* @param Watcher[] $watchers
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* @param EditStashCache $stashCache
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* @param LoggerInterface $logger
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* @param ServiceOptions $options
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* @param DeferredUpdatesManager $deferredUpdatesManager
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* @param User $user
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* @param Title $title
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* @param VariableHolder $vars
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* @param string $group
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* @throws InvalidArgumentException If $group is invalid or the 'action' variable is unset
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*/
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public function __construct(
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AbuseFilterHookRunner $hookRunner,
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FilterProfiler $filterProfiler,
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ChangeTagger $changeTagger,
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FilterLookup $filterLookup,
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RuleCheckerFactory $ruleCheckerFactory,
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ConsequencesExecutorFactory $consExecutorFactory,
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AbuseLoggerFactory $abuseLoggerFactory,
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VariablesManager $varManager,
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VariableGeneratorFactory $varGeneratorFactory,
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EmergencyCache $emergencyCache,
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array $watchers,
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EditStashCache $stashCache,
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LoggerInterface $logger,
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ServiceOptions $options,
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DeferredUpdatesManager $deferredUpdatesManager,
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User $user,
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Title $title,
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VariableHolder $vars,
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string $group
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) {
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$this->hookRunner = $hookRunner;
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$this->filterProfiler = $filterProfiler;
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$this->changeTagger = $changeTagger;
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$this->filterLookup = $filterLookup;
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$this->ruleCheckerFactory = $ruleCheckerFactory;
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$this->consExecutorFactory = $consExecutorFactory;
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$this->abuseLoggerFactory = $abuseLoggerFactory;
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$this->varManager = $varManager;
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$this->varGeneratorFactory = $varGeneratorFactory;
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$this->emergencyCache = $emergencyCache;
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$this->watchers = $watchers;
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$this->stashCache = $stashCache;
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$this->logger = $logger;
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$options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS );
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if ( !in_array( $group, $options->get( 'AbuseFilterValidGroups' ), true ) ) {
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throw new InvalidArgumentException( "Group $group is not a valid group" );
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}
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$this->options = $options;
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$this->deferredUpdatesManager = $deferredUpdatesManager;
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if ( !$vars->varIsSet( 'action' ) ) {
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throw new InvalidArgumentException( "The 'action' variable is not set." );
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}
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$this->user = $user;
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$this->title = $title;
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$this->vars = $vars;
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$this->group = $group;
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$this->action = $vars->getComputedVariable( 'action' )->toString();
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}
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/**
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* Inits variables and parser right before running
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*/
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private function init() {
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// Add vars from extensions
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$this->hookRunner->onAbuseFilter_filterAction(
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$this->vars,
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$this->title
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);
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$this->hookRunner->onAbuseFilterAlterVariables(
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$this->vars,
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$this->title,
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$this->user
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);
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$generator = $this->varGeneratorFactory->newGenerator( $this->vars );
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$this->vars = $generator->addGenericVars()->getVariableHolder();
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$this->ruleChecker = $this->ruleCheckerFactory->newRuleChecker( $this->vars );
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}
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/**
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* The main entry point of this class. This method runs all filters and takes their consequences.
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*
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* @param bool $allowStash Whether we are allowed to check the cache to see if there's a cached
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* result of a previous execution for the same edit.
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* @throws BadMethodCallException If run() was already called on this instance
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* @return Status Good if no action has been taken, a fatal otherwise.
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*/
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public function run( $allowStash = true ): Status {
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$this->init();
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$skipReasons = [];
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$shouldFilter = $this->hookRunner->onAbuseFilterShouldFilterAction(
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$this->vars, $this->title, $this->user, $skipReasons
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);
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if ( !$shouldFilter ) {
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$this->logger->info(
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'Skipping action {action}. Reasons provided: {reasons}',
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[ 'action' => $this->action, 'reasons' => implode( ', ', $skipReasons ) ]
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);
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return Status::newGood();
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}
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$useStash = $allowStash && $this->action === 'edit';
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$runnerData = null;
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if ( $useStash ) {
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$cacheData = $this->stashCache->seek( $this->vars );
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if ( $cacheData !== false ) {
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// Use cached vars (T176291) and profiling data (T191430)
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$this->vars = VariableHolder::newFromArray( $cacheData['vars'] );
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$runnerData = RunnerData::fromArray( $cacheData['data'] );
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}
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}
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$runnerData ??= $this->checkAllFiltersInternal();
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$this->deferredUpdatesManager->addCallableUpdate( function () use ( $runnerData ) {
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$this->profileExecution( $runnerData );
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$this->updateEmergencyCache( $runnerData->getMatchesMap() );
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} );
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// TODO: inject the action specifier to avoid this
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$accountname = $this->varManager->getVar(
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$this->vars,
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'accountname',
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VariablesManager::GET_BC
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)->toNative();
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$spec = new ActionSpecifier(
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$this->action,
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$this->title,
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$this->user,
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$this->user->getRequest()->getIP(),
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$accountname
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);
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// Tag the action if the condition limit was hit
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if ( $runnerData->getTotalConditions() > $this->options->get( 'AbuseFilterConditionLimit' ) ) {
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$this->changeTagger->addConditionsLimitTag( $spec );
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}
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$matchedFilters = $runnerData->getMatchedFilters();
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if ( count( $matchedFilters ) === 0 ) {
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return Status::newGood();
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}
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$executor = $this->consExecutorFactory->newExecutor( $spec, $this->vars );
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$status = $executor->executeFilterActions( $matchedFilters );
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$actionsTaken = $status->getValue();
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// Note, it's important that we create an AbuseLogger now, after all lazy-loaded variables
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// requested by active filters have been computed
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$abuseLogger = $this->abuseLoggerFactory->newLogger( $this->title, $this->user, $this->vars );
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[
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'local' => $loggedLocalFilters,
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'global' => $loggedGlobalFilters
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] = $abuseLogger->addLogEntries( $actionsTaken );
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foreach ( $this->watchers as $watcher ) {
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$watcher->run( $loggedLocalFilters, $loggedGlobalFilters, $this->group );
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}
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return $status;
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}
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/**
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* Similar to run(), but runs in "stash" mode, which means filters are executed, no actions are
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* taken, and the result is saved in cache to be later reused. This can only be used for edits,
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* and not doing so will throw.
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*
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* @throws InvalidArgumentException
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* @return Status Always a good status, since we're only saving data.
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*/
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public function runForStash(): Status {
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if ( $this->action !== 'edit' ) {
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throw new InvalidArgumentException(
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__METHOD__ . " can only be called for edits, called for action {$this->action}."
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);
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}
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$this->init();
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$skipReasons = [];
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$shouldFilter = $this->hookRunner->onAbuseFilterShouldFilterAction(
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$this->vars, $this->title, $this->user, $skipReasons
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);
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if ( !$shouldFilter ) {
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// Don't log it yet
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return Status::newGood();
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}
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// XXX: We need a copy here because the cache key is computed
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// from the variables, but some variables can be loaded lazily
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// which would store the data with a key distinct from that
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// computed by seek() in ::run().
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// TODO: Find better way to generate the cache key.
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$origVars = clone $this->vars;
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$runnerData = $this->checkAllFiltersInternal();
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// Save the filter stash result and do nothing further
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$cacheData = [
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'vars' => $this->varManager->dumpAllVars( $this->vars ),
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'data' => $runnerData->toArray(),
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];
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$this->stashCache->store( $origVars, $cacheData );
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return Status::newGood();
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}
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/**
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* Run all filters and return information about matches and profiling
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*
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* @return RunnerData
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*/
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private function checkAllFiltersInternal(): RunnerData {
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// Ensure there's no extra time leftover
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LazyVariableComputer::$profilingExtraTime = 0;
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$data = new RunnerData();
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foreach ( $this->filterLookup->getAllActiveFiltersInGroup( $this->group, false ) as $filter ) {
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[ $status, $timeTaken ] = $this->checkFilter( $filter );
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$data->record( $filter->getID(), false, $status, $timeTaken );
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}
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if ( $this->options->get( 'AbuseFilterCentralDB' ) && !$this->options->get( 'AbuseFilterIsCentral' ) ) {
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foreach ( $this->filterLookup->getAllActiveFiltersInGroup( $this->group, true ) as $filter ) {
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[ $status, $timeTaken ] = $this->checkFilter( $filter, true );
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$data->record( $filter->getID(), true, $status, $timeTaken );
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}
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}
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return $data;
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}
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/**
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* Returns an associative array of filters which were tripped
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*
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* @internal BC method
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* @return bool[] Map of (filter ID => bool)
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*/
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public function checkAllFilters(): array {
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$this->init();
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return $this->checkAllFiltersInternal()->getMatchesMap();
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}
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/**
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* Check the conditions of a single filter, and profile it
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*
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* @param ExistingFilter $filter
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* @param bool $global
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* @return array [ status, time taken ]
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* @phan-return array{0:\MediaWiki\Extension\AbuseFilter\Parser\RuleCheckerStatus,1:float}
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*/
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private function checkFilter( ExistingFilter $filter, bool $global = false ): array {
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$filterName = GlobalNameUtils::buildGlobalName( $filter->getID(), $global );
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$startTime = microtime( true );
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$origExtraTime = LazyVariableComputer::$profilingExtraTime;
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$status = $this->ruleChecker->checkConditions( $filter->getRules(), $filterName );
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$actualExtra = LazyVariableComputer::$profilingExtraTime - $origExtraTime;
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$timeTaken = 1000 * ( microtime( true ) - $startTime - $actualExtra );
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return [ $status, $timeTaken ];
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}
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/**
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* @param RunnerData $data
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*/
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private function profileExecution( RunnerData $data ) {
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$allFilters = $data->getAllFilters();
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$matchedFilters = $data->getMatchedFilters();
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$this->filterProfiler->recordRuntimeProfilingResult(
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count( $allFilters ),
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$data->getTotalConditions(),
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$data->getTotalRuntime()
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);
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$this->filterProfiler->recordPerFilterProfiling( $this->title, $data->getProfilingData() );
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$this->filterProfiler->recordStats(
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$this->group,
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$data->getTotalConditions(),
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$data->getTotalRuntime(),
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(bool)$matchedFilters
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);
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}
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/**
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* @param bool[] $matches
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*/
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private function updateEmergencyCache( array $matches ): void {
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$filters = $this->emergencyCache->getFiltersToCheckInGroup( $this->group );
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foreach ( $filters as $filter ) {
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if ( array_key_exists( "$filter", $matches ) ) {
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$this->emergencyCache->incrementForFilter( $filter, $matches["$filter"] );
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}
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}
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}
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}
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