mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/AbuseFilter.git
synced 2024-09-24 10:48:17 +00:00
328dbc99c7
I just realized that the parser is already throwing if it finds a disabled variable. Hence, all calls to getVar with a disabled var are from old entries and the like, and we don't care. Bug: T234048 Change-Id: I39429d286575df91108a4119177a0d3aef181d0b
298 lines
8.6 KiB
PHP
298 lines
8.6 KiB
PHP
<?php
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use Psr\Log\LoggerInterface;
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class AbuseFilterVariableHolder {
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/**
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* Used in self::getVar() to determine what to do if the requested variable is missing
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*/
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const GET_LAX = 0;
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const GET_STRICT = 1;
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/** @var LoggerInterface */
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private $logger;
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/**
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* @var (AFPData|AFComputedVariable)[]
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* @fixme This should be private, but it isn't because of T231542: there are serialized instances
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* stored in the DB, and mVars wouldn't be available in HHVM after deserializing them (T213006)
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*/
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public $mVars = [];
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/** @var bool Whether this object is being used for an ongoing action being filtered */
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public $forFilter = false;
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/** @var int 2 is the default and means that new variables names (from T173889) should be used.
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* 1 means that the old ones should be used, e.g. if this object is constructed from an
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* afl_var_dump which still bears old variables.
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*/
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public $mVarsVersion = 2;
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/**
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* To avoid injecting a logger directly, since it's here only temporarily.
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*/
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public function __construct() {
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$this->logger = new Psr\Log\NullLogger();
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}
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/**
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* @param LoggerInterface $logger
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*/
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public function setLogger( LoggerInterface $logger ) {
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$this->logger = $logger;
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}
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/**
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* Utility function to translate an array with shape [ varname => value ] into a self instance
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*
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* @param array $vars
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* @return AbuseFilterVariableHolder
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*/
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public static function newFromArray( array $vars ) : AbuseFilterVariableHolder {
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$ret = new self;
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foreach ( $vars as $var => $value ) {
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$ret->setVar( $var, $value );
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}
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return $ret;
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}
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/**
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* @param string $variable
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* @param mixed $datum
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*/
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public function setVar( $variable, $datum ) {
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$variable = strtolower( $variable );
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if ( !( $datum instanceof AFPData || $datum instanceof AFComputedVariable ) ) {
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$datum = AFPData::newFromPHPVar( $datum );
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}
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$this->mVars[$variable] = $datum;
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}
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/**
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* Get all variables stored in this object
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*
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* @return (AFPData|AFComputedVariable)[]
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*/
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public function getVars() {
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return $this->mVars;
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}
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/**
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* Get a lazy loader for a variable. This method is here for testing ease
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* @param string $method
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* @param array $parameters
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* @return AFComputedVariable
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*/
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public function getLazyLoader( $method, $parameters ) {
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return new AFComputedVariable( $method, $parameters );
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}
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/**
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* @param string $variable
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* @param string $method
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* @param array $parameters
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*/
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public function setLazyLoadVar( $variable, $method, $parameters ) {
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$placeholder = $this->getLazyLoader( $method, $parameters );
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$this->setVar( $variable, $placeholder );
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}
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/**
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* Get a variable from the current object
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*
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* @param string $varName The variable name
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* @param int $flags If self::GET_STRICT is set, this will throw if
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* the requested variable is not set. Otherwise it will return a DUNDEFINED AFPData.
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* NOTE: For now, it will return DUNDEFINED even with GET_STRICT.
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* @param string|null $tempFilter Filter ID, if available; only used for debugging (temporarily)
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* @return AFPData
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*/
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public function getVar( $varName, $flags = self::GET_STRICT, $tempFilter = null ) : AFPData {
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$varName = strtolower( $varName );
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if ( $this->mVarsVersion === 1 && in_array( $varName, AbuseFilter::getDeprecatedVariables() ) ) {
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// Variables are stored with old names, but the parser has given us
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// a new name. Translate it back.
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$varName = array_search( $varName, AbuseFilter::getDeprecatedVariables() );
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}
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if ( $this->varIsSet( $varName ) ) {
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/** @var $variable AFComputedVariable|AFPData */
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$variable = $this->mVars[$varName];
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if ( $variable instanceof AFComputedVariable ) {
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$value = $variable->compute( $this );
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$this->setVar( $varName, $value );
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return $value;
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} elseif ( $variable instanceof AFPData ) {
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return $variable;
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} else {
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throw new UnexpectedValueException(
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"Variable $varName has unexpected type " . gettype( $variable )
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);
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}
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} elseif ( !( $flags & self::GET_STRICT ) ) {
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return new AFPData( AFPData::DUNDEFINED );
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} else {
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$this->logger->warning(
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__METHOD__ . ": requested unset variable {varname} in strict mode, filter: {filter}",
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[
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'varname' => $varName,
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'trace' => ( new Exception )->getTraceAsString(),
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'filter' => $tempFilter ?? 'unavailable'
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]
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);
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// @todo change the line below to throw an exception in a future MW version
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return new AFPData( AFPData::DUNDEFINED );
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}
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}
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/**
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* @return AbuseFilterVariableHolder
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*/
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public static function merge() {
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$newHolder = new AbuseFilterVariableHolder;
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$newHolder->addHolders( ...func_get_args() );
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return $newHolder;
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}
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/**
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* Merge any number of holders given as arguments into this holder.
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*
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* @throws MWException
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*/
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public function addHolders() {
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$holders = func_get_args();
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foreach ( $holders as $addHolder ) {
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if ( !is_object( $addHolder ) ) {
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throw new MWException( 'Invalid argument to AbuseFilterVariableHolder::addHolders' );
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}
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$this->mVars = array_merge( $this->mVars, $addHolder->mVars );
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}
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}
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/**
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* Export all variables stored in this object.
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*
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* @param bool $nativeTypes If true, variables will be exported with native types, otherwise
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* they'll be cast to strings.
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* @return array
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*/
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public function exportAllVars( $nativeTypes = false ) {
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$exported = [];
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foreach ( array_keys( $this->mVars ) as $varName ) {
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if ( $nativeTypes ) {
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$exported[ $varName ] = $this->getVar( $varName )->toNative();
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} else {
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$exported[ $varName ] = $this->getVar( $varName )->toString();
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}
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}
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return $exported;
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}
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/**
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* Export all non-lazy variables stored in this object as string
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*
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* @return string[]
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*/
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public function exportNonLazyVars() {
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$exported = [];
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foreach ( $this->mVars as $varName => $data ) {
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if ( !( $data instanceof AFComputedVariable ) ) {
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$exported[$varName] = $this->getVar( $varName )->toString();
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}
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}
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return $exported;
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}
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/**
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* Dump all variables stored in this object in their native types.
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* If you want a not yet set variable to be included in the results you can
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* either set $compute to an array with the name of the variable or set
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* $compute to true to compute all not yet set variables.
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*
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* @param array|bool $compute Variables we should copute if not yet set
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* @param bool $includeUserVars Include user set variables
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* @return array
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*/
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public function dumpAllVars( $compute = [], $includeUserVars = false ) {
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$coreVariables = [];
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if ( !$includeUserVars ) {
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// Compile a list of all variables set by the extension to be able
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// to filter user set ones by name
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global $wgRestrictionTypes;
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$activeVariables = array_keys( AbuseFilter::getBuilderValues()['vars'] );
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$deprecatedVariables = array_keys( AbuseFilter::getDeprecatedVariables() );
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$disabledVariables = array_keys( AbuseFilter::$disabledVars );
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$coreVariables = array_merge( $activeVariables, $deprecatedVariables, $disabledVariables );
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// @todo _restrictions variables should be handled in builderValues as well.
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$prefixes = [ 'moved_from', 'moved_to', 'page' ];
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foreach ( $wgRestrictionTypes as $action ) {
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foreach ( $prefixes as $prefix ) {
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$coreVariables[] = "{$prefix}_restrictions_$action";
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}
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}
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$coreVariables = array_map( 'strtolower', $coreVariables );
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}
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$exported = [];
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foreach ( array_keys( $this->mVars ) as $varName ) {
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$computeThis = ( is_array( $compute ) && in_array( $varName, $compute ) ) || $compute === true;
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if (
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( $includeUserVars || in_array( strtolower( $varName ), $coreVariables ) ) &&
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// Only include variables set in the extension in case $includeUserVars is false
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( $computeThis || $this->mVars[$varName] instanceof AFPData )
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) {
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$exported[$varName] = $this->getVar( $varName )->toNative();
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}
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}
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return $exported;
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}
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/**
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* @param string $var
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* @return bool
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*/
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public function varIsSet( $var ) {
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return array_key_exists( $var, $this->mVars );
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}
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/**
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* Compute all vars which need DB access. Useful for vars which are going to be saved
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* cross-wiki or used for offline analysis.
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*/
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public function computeDBVars() {
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static $dbTypes = [
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'links-from-wikitext-or-database',
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'load-recent-authors',
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'page-age',
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'get-page-restrictions',
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'simple-user-accessor',
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'user-age',
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'user-groups',
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'user-rights',
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'revision-text-by-id',
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'revision-text-by-timestamp'
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];
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/** @var AFComputedVariable[] $missingVars */
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$missingVars = array_filter( $this->mVars, function ( $el ) {
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return ( $el instanceof AFComputedVariable );
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} );
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foreach ( $missingVars as $name => $value ) {
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if ( in_array( $value->mMethod, $dbTypes ) ) {
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$value = $value->compute( $this );
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$this->setVar( $name, $value );
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}
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}
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}
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}
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