mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/AbuseFilter.git
synced 2024-11-24 22:15:26 +00:00
1973 lines
51 KiB
PHP
1973 lines
51 KiB
PHP
<?php
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namespace MediaWiki\Extension\AbuseFilter\Parser;
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use AbuseFilterVariableHolder;
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use BagOStuff;
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use Exception;
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use IBufferingStatsdDataFactory;
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use InvalidArgumentException;
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use Language;
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use MediaWiki\Extension\AbuseFilter\KeywordsManager;
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use NullStatsdDataFactory;
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use Psr\Log\LoggerInterface;
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use Sanitizer;
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use Wikimedia\AtEase\AtEase;
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use Wikimedia\Equivset\Equivset;
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use Wikimedia\IPUtils;
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class AbuseFilterParser extends AFPTransitionBase {
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/**
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* @var array[] Contains the AFPTokens for the code being parsed
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*/
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public $mTokens;
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/**
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* @var bool Are we inside a short circuit evaluation?
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*/
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public $mShortCircuit;
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/**
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* @var bool Are we allowed to use short-circuit evaluation?
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*/
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public $mAllowShort;
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/**
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* @var AFPToken The current token
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*/
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public $mCur;
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/**
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* @var AbuseFilterVariableHolder
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*/
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public $mVariables;
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/**
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* @var int The current amount of conditions being consumed
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*/
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protected $mCondCount;
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/**
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* @var bool Whether the condition limit is enabled.
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*/
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protected $condLimitEnabled = true;
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/**
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* @var string|null The ID of the filter being parsed, if available. Can also be "global-$ID"
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*/
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protected $mFilter;
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/**
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* @var bool Whether we can allow retrieving _builtin_ variables not included in $this->mVariables
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*/
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protected $allowMissingVariables = false;
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/**
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* @var BagOStuff Used to cache the AST (in CachingParser) and the tokens
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*/
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protected $cache;
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/**
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* @var bool Whether the AST was retrieved from cache (CachingParser only)
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*/
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protected $fromCache = false;
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/**
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* @var LoggerInterface Used for debugging
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*/
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protected $logger;
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/**
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* @var Language Content language, used for language-dependent functions
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*/
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protected $contLang;
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/**
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* @var IBufferingStatsdDataFactory
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*/
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protected $statsd;
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/** @var KeywordsManager */
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protected $keywordsManager;
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/** @var int */
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private $conditionsLimit;
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/** @var UserVisibleWarning[] */
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protected $warnings = [];
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// Functions that affect parser state, and shouldn't be cached.
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public const ACTIVE_FUNCTIONS = [
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'funcSetVar',
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];
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public const KEYWORDS = [
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'in' => 'keywordIn',
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'like' => 'keywordLike',
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'matches' => 'keywordLike',
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'contains' => 'keywordContains',
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'rlike' => 'keywordRegex',
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'irlike' => 'keywordRegexInsensitive',
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'regex' => 'keywordRegex',
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];
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/**
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* @var array Cached results of functions
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*/
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protected $funcCache = [];
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/**
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* @var Equivset
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*/
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protected static $equivset;
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/**
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* Create a new instance
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*
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* @param Language $contLang Content language, used for language-dependent function
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* @param BagOStuff $cache Used to cache the AST (in CachingParser) and the tokens
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* @param LoggerInterface $logger Used for debugging
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* @param KeywordsManager $keywordsManager
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* @param int $conditionsLimit
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* @param AbuseFilterVariableHolder|null $vars
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*/
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public function __construct(
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Language $contLang,
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BagOStuff $cache,
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LoggerInterface $logger,
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KeywordsManager $keywordsManager,
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int $conditionsLimit,
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AbuseFilterVariableHolder $vars = null
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) {
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$this->contLang = $contLang;
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$this->cache = $cache;
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$this->logger = $logger;
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$this->statsd = new NullStatsdDataFactory;
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$this->keywordsManager = $keywordsManager;
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$this->conditionsLimit = $conditionsLimit;
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$this->resetState();
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if ( $vars ) {
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$this->mVariables = $vars;
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}
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$this->mVariables->setLogger( $logger );
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}
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/**
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* @param string $filter
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*/
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public function setFilter( $filter ) {
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$this->mFilter = $filter;
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}
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/**
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* @param BagOStuff $cache
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*/
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public function setCache( BagOStuff $cache ) {
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$this->cache = $cache;
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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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* @param IBufferingStatsdDataFactory $statsd
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*/
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public function setStatsd( IBufferingStatsdDataFactory $statsd ) {
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$this->statsd = $statsd;
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}
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/**
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* @return int
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*/
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public function getCondCount() {
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return $this->mCondCount;
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}
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/**
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* Reset the conditions counter
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*/
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public function resetCondCount() {
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$this->mCondCount = 0;
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}
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/**
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* For use in batch scripts and the like
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*
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* @param bool $enable True to enable the limit, false to disable it
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*/
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public function toggleConditionLimit( $enable ) {
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$this->condLimitEnabled = $enable;
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}
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/**
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* @param int $val The amount to increase the conditions count of.
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* @throws AFPException
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*/
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protected function raiseCondCount( $val = 1 ) {
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$this->mCondCount += $val;
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if ( $this->condLimitEnabled && $this->mCondCount > $this->conditionsLimit ) {
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throw new AFPException( 'Condition limit reached.' );
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}
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}
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/**
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* Resets the state of the parser.
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*/
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public function resetState() {
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$this->mTokens = [];
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$this->mVariables = new AbuseFilterVariableHolder( $this->keywordsManager );
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$this->mPos = 0;
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$this->mShortCircuit = false;
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$this->mAllowShort = true;
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$this->mCondCount = 0;
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$this->mFilter = null;
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$this->warnings = [];
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}
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/**
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* Clears the array of cached function results
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*/
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public function clearFuncCache() {
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$this->funcCache = [];
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}
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/**
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* @param AbuseFilterVariableHolder $vars
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*/
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public function setVariables( AbuseFilterVariableHolder $vars ) {
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$this->mVariables = $vars;
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}
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/**
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* Check the syntax of $filter, throwing an exception if invalid
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* @param string $filter
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* @return true When successful
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* @throws AFPUserVisibleException
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*/
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public function checkSyntaxThrow( string $filter ) : bool {
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$this->allowMissingVariables = true;
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$origAS = $this->mAllowShort;
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try {
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$this->mAllowShort = false;
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$this->intEval( $filter );
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} finally {
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$this->mAllowShort = $origAS;
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$this->allowMissingVariables = false;
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}
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return true;
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}
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/**
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* Check the syntax of $filter, without throwing
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*
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* @param string $filter
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* @return ParserStatus The result indicates whether the syntax is valid
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*/
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public function checkSyntax( string $filter ) : ParserStatus {
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try {
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$valid = $this->checkSyntaxThrow( $filter );
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} catch ( AFPUserVisibleException $excep ) {
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$valid = false;
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}
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// @phan-suppress-next-line PhanCoalescingNeverUndefined
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return new ParserStatus( $valid, $this->fromCache, $excep ?? null, $this->warnings );
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}
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/**
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* This is the main entry point. It checks the given conditions and returns whether
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* they match. In case of bad syntax, this is always logged, and $ignoreError can
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* be used to determine whether this method should throw.
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*
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* @param string $conds
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* @param bool $ignoreError
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* @param string|null $filter The ID of the filter being parsed
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* @return ParserStatus
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* @throws AFPException
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*/
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public function checkConditions( string $conds, $ignoreError = true, $filter = null ) : ParserStatus {
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$result = $this->parseDetailed( $conds );
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$excep = $result->getException();
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if ( $excep !== null ) {
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if ( $excep instanceof AFPUserVisibleException ) {
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$msg = $excep->getMessageForLogs();
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$excep->setLocalizedMessage();
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} else {
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$msg = $excep->getMessage();
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}
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$extraInfo = $filter !== null ? " for filter $filter" : '';
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$this->logger->warning( "AbuseFilter parser error$extraInfo: $msg" );
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if ( !$ignoreError ) {
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throw $excep;
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}
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}
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return $result;
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}
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/**
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* Move to the next token
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*/
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protected function move() {
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list( $this->mCur, $this->mPos ) = $this->mTokens[$this->mPos];
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}
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/**
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* Get the next token. This is similar to move() but doesn't change class members,
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* allowing to look ahead without rolling back the state.
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*
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* @return AFPToken
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*/
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protected function getNextToken() {
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return $this->mTokens[$this->mPos][0];
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}
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/**
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* getState() function allows parser state to be rollbacked to several tokens back
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* @return AFPParserState
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*/
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protected function getState() {
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return new AFPParserState( $this->mCur, $this->mPos );
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}
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/**
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* setState() function allows parser state to be rollbacked to several tokens back
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* @param AFPParserState $state
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*/
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protected function setState( AFPParserState $state ) {
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$this->mCur = $state->token;
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$this->mPos = $state->pos;
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}
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/**
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* @throws AFPUserVisibleException
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*/
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protected function skipOverBraces() {
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$braces = 1;
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while ( $this->mCur->type !== AFPToken::TNONE && $braces > 0 ) {
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$this->move();
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if ( $this->mCur->type === AFPToken::TBRACE ) {
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if ( $this->mCur->value === '(' ) {
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$braces++;
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} elseif ( $this->mCur->value === ')' ) {
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$braces--;
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}
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} elseif ( $this->mCur->type === AFPToken::TID ) {
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// T214674, define non-existing variables. @see docs of
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// AbuseFilterCachingParser::discardWithHoisting for a detailed explanation of this branch
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$next = $this->getNextToken();
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if (
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in_array( $this->mCur->value, [ 'set', 'set_var' ] ) &&
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$next->type === AFPToken::TBRACE && $next->value === '('
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) {
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// This is for setter functions.
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$this->move();
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$braces++;
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$next = $this->getNextToken();
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if ( $next->type === AFPToken::TSTRING ) {
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if ( !$this->mVariables->varIsSet( $next->value ) ) {
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$this->setUserVariable( $next->value, new AFPData( AFPData::DUNDEFINED ) );
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}
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}
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} else {
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// Simple assignment with :=
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$varname = $this->mCur->value;
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$next = $this->getNextToken();
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if ( $next->type === AFPToken::TOP && $next->value === ':=' ) {
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if ( !$this->mVariables->varIsSet( $varname ) ) {
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$this->setUserVariable( $varname, new AFPData( AFPData::DUNDEFINED ) );
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}
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} elseif ( $next->type === AFPToken::TSQUAREBRACKET && $next->value === '[' ) {
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if ( !$this->mVariables->varIsSet( $varname ) ) {
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throw new AFPUserVisibleException( 'unrecognisedvar',
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$next->pos,
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[ $varname ]
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);
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}
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$this->setUserVariable( $varname, new AFPData( AFPData::DUNDEFINED ) );
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}
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}
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}
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}
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if ( !( $this->mCur->type === AFPToken::TBRACE && $this->mCur->value === ')' ) ) {
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throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos, [ ')' ] );
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}
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}
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/**
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* @param string $code
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* @return bool
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*/
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public function parse( $code ) {
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return $this->intEval( $code )->toBool();
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}
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/**
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* Like self::parse(), but returns an object with additional info
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* @param string $code
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* @return ParserStatus
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*/
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public function parseDetailed( string $code ) : ParserStatus {
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$excep = null;
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try {
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$res = $this->parse( $code );
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} catch ( AFPException $excep ) {
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$res = false;
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}
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return new ParserStatus( $res, $this->fromCache, $excep, $this->warnings );
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}
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/**
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* @param string $filter
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* @return string
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*/
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public function evaluateExpression( $filter ) {
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return $this->intEval( $filter )->toNative();
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}
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/**
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* @param string $code
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* @return AFPData
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*/
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public function intEval( $code ) {
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$startTime = microtime( true );
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// Reset all class members to their default value
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$tokenizer = new AbuseFilterTokenizer( $this->cache, $this->logger );
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$this->mTokens = $tokenizer->getTokens( $code );
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$this->mPos = 0;
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$this->mShortCircuit = false;
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$result = new AFPData( AFPData::DEMPTY );
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$this->doLevelEntry( $result );
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if ( $result->getType() === AFPData::DUNDEFINED ) {
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$result = new AFPData( AFPData::DBOOL, false );
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}
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$this->statsd->timing( 'abusefilter_oldparser_full', microtime( true ) - $startTime );
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return $result;
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}
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/* Levels */
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/**
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* Handles unexpected characters after the expression
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*
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* @param AFPData &$result
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* @throws AFPUserVisibleException
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*/
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protected function doLevelEntry( &$result ) {
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$this->doLevelSemicolon( $result );
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if ( $this->mCur->type !== AFPToken::TNONE ) {
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throw new AFPUserVisibleException(
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'unexpectedatend',
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$this->mCur->pos, [ $this->mCur->type ]
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);
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}
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}
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/**
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* Handles multiple expressions delimited by a semicolon
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*
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* @param AFPData &$result
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*/
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protected function doLevelSemicolon( &$result ) {
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do {
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$this->move();
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if ( $this->mCur->type !== AFPToken::TSTATEMENTSEPARATOR ) {
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$this->doLevelSet( $result );
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}
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} while ( $this->mCur->type === AFPToken::TSTATEMENTSEPARATOR );
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}
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/**
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* Handles assignments (:=)
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*
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* @param AFPData &$result
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* @throws AFPUserVisibleException
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*/
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protected function doLevelSet( &$result ) {
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if ( $this->mCur->type === AFPToken::TID ) {
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$varname = $this->mCur->value;
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$prev = $this->getState();
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$this->move();
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if ( $this->mCur->type === AFPToken::TOP && $this->mCur->value === ':=' ) {
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$this->move();
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$checkEmpty = $result->getType() === AFPData::DEMPTY;
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$this->doLevelSet( $result );
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if ( $checkEmpty && $result->getType() === AFPData::DEMPTY ) {
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$this->logEmptyOperand( 'var assignment' );
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}
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$this->setUserVariable( $varname, $result );
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return;
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} elseif ( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === '[' ) {
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// We allow builtin variables to both check for override (e.g. added_lines[] :='x')
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// and for T198531
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$array = $this->getVarValue( $varname );
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if (
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$array->getType() !== AFPData::DARRAY && $array->getType() !== AFPData::DUNDEFINED
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// NOTE: we cannot throw for overridebuiltin yet, in case this turns out not to be an assignment.
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&& !$this->keywordsManager->varExists( $varname )
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) {
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throw new AFPUserVisibleException( 'notarray', $this->mCur->pos, [] );
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}
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$this->move();
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if ( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === ']' ) {
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$idx = 'new';
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} else {
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$this->setState( $prev );
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$this->move();
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$idx = new AFPData( AFPData::DEMPTY );
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$this->doLevelSemicolon( $idx );
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if ( !( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === ']' ) ) {
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throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos,
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[ ']', $this->mCur->type, $this->mCur->value ] );
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}
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if ( $array->getType() === AFPData::DARRAY && $idx->getType() !== AFPData::DUNDEFINED ) {
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$intIdx = $idx->toInt();
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if ( count( $array->toArray() ) <= $intIdx ) {
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throw new AFPUserVisibleException( 'outofbounds', $this->mCur->pos,
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[ $intIdx, count( $array->getData() ) ] );
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} elseif ( $intIdx < 0 ) {
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throw new AFPUserVisibleException( 'negativeindex', $this->mCur->pos, [ $intIdx ] );
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}
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}
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}
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$this->move();
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if ( $this->mCur->type === AFPToken::TOP && $this->mCur->value === ':=' ) {
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if ( $this->isReservedIdentifier( $varname ) ) {
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// Ideally we should've aborted before trying to parse the index
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throw new AFPUserVisibleException( 'overridebuiltin', $this->mCur->pos, [ $varname ] );
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}
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$this->move();
|
|
if ( $this->mCur->type === AFPToken::TNONE ) {
|
|
$this->logEmptyOperand( 'array assignment' );
|
|
}
|
|
$this->doLevelSet( $result );
|
|
if ( $array->getType() === AFPData::DARRAY ) {
|
|
// If it's a DUNDEFINED, leave it as is
|
|
$array = $array->toArray();
|
|
if ( $idx === 'new' ) {
|
|
$array[] = $result;
|
|
$array = new AFPData( AFPData::DARRAY, $array );
|
|
} elseif ( $idx->getType() === AFPData::DUNDEFINED ) {
|
|
$array = new AFPData( AFPData::DUNDEFINED );
|
|
} else {
|
|
$array[$idx->toInt()] = $result;
|
|
$array = new AFPData( AFPData::DARRAY, $array );
|
|
}
|
|
$this->setUserVariable( $varname, $array );
|
|
}
|
|
|
|
return;
|
|
} else {
|
|
$this->setState( $prev );
|
|
}
|
|
} else {
|
|
$this->setState( $prev );
|
|
}
|
|
}
|
|
$this->doLevelConditions( $result );
|
|
}
|
|
|
|
/**
|
|
* Handles conditionals: if-then-else and ternary operator
|
|
*
|
|
* @param AFPData &$result
|
|
* @throws AFPUserVisibleException
|
|
* @suppress PhanPossiblyUndeclaredVariable
|
|
*/
|
|
protected function doLevelConditions( &$result ) {
|
|
if ( $this->mCur->type === AFPToken::TKEYWORD && $this->mCur->value === 'if' ) {
|
|
$this->move();
|
|
$this->doLevelBoolOps( $result );
|
|
|
|
if ( !( $this->mCur->type === AFPToken::TKEYWORD && $this->mCur->value === 'then' ) ) {
|
|
throw new AFPUserVisibleException( 'expectednotfound',
|
|
$this->mCur->pos,
|
|
[
|
|
'then',
|
|
$this->mCur->type,
|
|
$this->mCur->value
|
|
]
|
|
);
|
|
}
|
|
$this->move();
|
|
|
|
$r1 = new AFPData( AFPData::DEMPTY );
|
|
$r2 = new AFPData( AFPData::DEMPTY );
|
|
|
|
$isTrue = $result->getType() === AFPData::DUNDEFINED ? false : $result->toBool();
|
|
|
|
if ( !$isTrue ) {
|
|
$scOrig = wfSetVar( $this->mShortCircuit, $this->mAllowShort, true );
|
|
}
|
|
$this->doLevelConditions( $r1 );
|
|
if ( !$isTrue ) {
|
|
$this->mShortCircuit = $scOrig;
|
|
}
|
|
|
|
if ( $this->mCur->type === AFPToken::TKEYWORD && $this->mCur->value === 'else' ) {
|
|
$this->move();
|
|
|
|
if ( $isTrue ) {
|
|
$scOrig = wfSetVar( $this->mShortCircuit, $this->mAllowShort, true );
|
|
}
|
|
$this->doLevelConditions( $r2 );
|
|
if ( $isTrue ) {
|
|
$this->mShortCircuit = $scOrig;
|
|
}
|
|
} else {
|
|
// DNULL is assumed as default in case of a missing else
|
|
$r2 = new AFPData( AFPData::DNULL );
|
|
}
|
|
|
|
if ( !( $this->mCur->type === AFPToken::TKEYWORD && $this->mCur->value === 'end' ) ) {
|
|
throw new AFPUserVisibleException( 'expectednotfound',
|
|
$this->mCur->pos,
|
|
[
|
|
'end',
|
|
$this->mCur->type,
|
|
$this->mCur->value
|
|
]
|
|
);
|
|
}
|
|
$this->move();
|
|
|
|
$isTrue = $result->getType() === AFPData::DUNDEFINED ? false : $result->toBool();
|
|
if ( $isTrue ) {
|
|
$result = $r1;
|
|
} else {
|
|
$result = $r2;
|
|
}
|
|
} else {
|
|
$this->doLevelBoolOps( $result );
|
|
if ( $this->mCur->type === AFPToken::TOP && $this->mCur->value === '?' ) {
|
|
$this->move();
|
|
$r1 = new AFPData( AFPData::DEMPTY );
|
|
$r2 = new AFPData( AFPData::DEMPTY );
|
|
|
|
$isTrue = $result->getType() === AFPData::DUNDEFINED ? false : $result->toBool();
|
|
|
|
if ( !$isTrue ) {
|
|
$scOrig = wfSetVar( $this->mShortCircuit, $this->mAllowShort, true );
|
|
}
|
|
$this->doLevelConditions( $r1 );
|
|
if ( !$isTrue ) {
|
|
$this->mShortCircuit = $scOrig;
|
|
}
|
|
|
|
if ( !( $this->mCur->type === AFPToken::TOP && $this->mCur->value === ':' ) ) {
|
|
throw new AFPUserVisibleException( 'expectednotfound',
|
|
$this->mCur->pos,
|
|
[
|
|
':',
|
|
$this->mCur->type,
|
|
$this->mCur->value
|
|
]
|
|
);
|
|
}
|
|
$this->move();
|
|
|
|
if ( $isTrue ) {
|
|
$scOrig = wfSetVar( $this->mShortCircuit, $this->mAllowShort, true );
|
|
}
|
|
$this->doLevelConditions( $r2 );
|
|
if ( $r2->getType() === AFPData::DEMPTY ) {
|
|
$this->logEmptyOperand( 'ternary else' );
|
|
}
|
|
if ( $isTrue ) {
|
|
$this->mShortCircuit = $scOrig;
|
|
}
|
|
|
|
if ( $isTrue ) {
|
|
$result = $r1;
|
|
} else {
|
|
$result = $r2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles boolean operators (&, |, ^)
|
|
*
|
|
* @param AFPData &$result
|
|
*/
|
|
protected function doLevelBoolOps( &$result ) {
|
|
$this->doLevelCompares( $result );
|
|
$ops = [ '&', '|', '^' ];
|
|
while ( $this->mCur->type === AFPToken::TOP && in_array( $this->mCur->value, $ops ) ) {
|
|
$op = $this->mCur->value;
|
|
$this->move();
|
|
$r2 = new AFPData( AFPData::DEMPTY );
|
|
$curVal = $result->getType() === AFPData::DUNDEFINED ? false : $result->toBool();
|
|
|
|
// We can go on quickly as either one statement with | is true or one with & is false
|
|
if ( ( $op === '&' && !$curVal ) || ( $op === '|' && $curVal ) ) {
|
|
$scOrig = wfSetVar( $this->mShortCircuit, $this->mAllowShort, true );
|
|
$this->doLevelCompares( $r2 );
|
|
if ( $r2->getType() === AFPData::DEMPTY ) {
|
|
$this->logEmptyOperand( 'bool operand' );
|
|
}
|
|
$this->mShortCircuit = $scOrig;
|
|
$result = new AFPData( AFPData::DBOOL, $curVal );
|
|
continue;
|
|
}
|
|
|
|
$this->doLevelCompares( $r2 );
|
|
if ( $r2->getType() === AFPData::DEMPTY ) {
|
|
$this->logEmptyOperand( 'bool operand' );
|
|
}
|
|
$result = $result->boolOp( $r2, $op );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles comparison operators
|
|
*
|
|
* @param AFPData &$result
|
|
*/
|
|
protected function doLevelCompares( &$result ) {
|
|
$this->doLevelSumRels( $result );
|
|
$equalityOps = [ '==', '===', '!=', '!==', '=' ];
|
|
$orderOps = [ '<', '>', '<=', '>=' ];
|
|
// Only allow either a single operation, or a combination of a single equalityOps and a single
|
|
// orderOps. This resembles what PHP does, and allows `a < b == c` while rejecting `a < b < c`
|
|
$allowedOps = array_merge( $equalityOps, $orderOps );
|
|
while ( $this->mCur->type === AFPToken::TOP && in_array( $this->mCur->value, $allowedOps ) ) {
|
|
$allowedOps = in_array( $this->mCur->value, $equalityOps ) ?
|
|
array_diff( $allowedOps, $equalityOps ) :
|
|
array_diff( $allowedOps, $orderOps );
|
|
$op = $this->mCur->value;
|
|
$this->move();
|
|
$r2 = new AFPData( AFPData::DEMPTY );
|
|
$this->doLevelSumRels( $r2 );
|
|
if ( $r2->getType() === AFPData::DEMPTY ) {
|
|
$this->logEmptyOperand( 'compare operand' );
|
|
}
|
|
if ( $this->mShortCircuit ) {
|
|
// The result doesn't matter.
|
|
continue;
|
|
}
|
|
$this->raiseCondCount();
|
|
$result = $result->compareOp( $r2, $op );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles sum-related operations (+ and -)
|
|
*
|
|
* @param AFPData &$result
|
|
*/
|
|
protected function doLevelSumRels( &$result ) {
|
|
$this->doLevelMulRels( $result );
|
|
$ops = [ '+', '-' ];
|
|
while ( $this->mCur->type === AFPToken::TOP && in_array( $this->mCur->value, $ops ) ) {
|
|
$op = $this->mCur->value;
|
|
$this->move();
|
|
$r2 = new AFPData( AFPData::DEMPTY );
|
|
$this->doLevelMulRels( $r2 );
|
|
if ( $r2->getType() === AFPData::DEMPTY ) {
|
|
$this->logEmptyOperand( 'sum operand' );
|
|
}
|
|
if ( $this->mShortCircuit ) {
|
|
// The result doesn't matter.
|
|
continue;
|
|
}
|
|
if ( $op === '+' ) {
|
|
$result = $result->sum( $r2 );
|
|
}
|
|
if ( $op === '-' ) {
|
|
$result = $result->sub( $r2 );
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles multiplication-related operations (*, / and %)
|
|
*
|
|
* @param AFPData &$result
|
|
*/
|
|
protected function doLevelMulRels( &$result ) {
|
|
$this->doLevelPow( $result );
|
|
$ops = [ '*', '/', '%' ];
|
|
while ( $this->mCur->type === AFPToken::TOP && in_array( $this->mCur->value, $ops ) ) {
|
|
$op = $this->mCur->value;
|
|
$this->move();
|
|
$r2 = new AFPData( AFPData::DEMPTY );
|
|
$this->doLevelPow( $r2 );
|
|
if ( $r2->getType() === AFPData::DEMPTY ) {
|
|
$this->logEmptyOperand( 'multiplication operand' );
|
|
}
|
|
if ( $this->mShortCircuit ) {
|
|
// The result doesn't matter.
|
|
continue;
|
|
}
|
|
$result = $result->mulRel( $r2, $op, $this->mCur->pos );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles powers (**)
|
|
*
|
|
* @param AFPData &$result
|
|
*/
|
|
protected function doLevelPow( &$result ) {
|
|
$this->doLevelBoolInvert( $result );
|
|
while ( $this->mCur->type === AFPToken::TOP && $this->mCur->value === '**' ) {
|
|
$this->move();
|
|
$expanent = new AFPData( AFPData::DEMPTY );
|
|
$this->doLevelBoolInvert( $expanent );
|
|
if ( $expanent->getType() === AFPData::DEMPTY ) {
|
|
$this->logEmptyOperand( 'power operand' );
|
|
}
|
|
if ( $this->mShortCircuit ) {
|
|
// The result doesn't matter.
|
|
continue;
|
|
}
|
|
$result = $result->pow( $expanent );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles boolean inversion (!)
|
|
*
|
|
* @param AFPData &$result
|
|
*/
|
|
protected function doLevelBoolInvert( &$result ) {
|
|
if ( $this->mCur->type === AFPToken::TOP && $this->mCur->value === '!' ) {
|
|
$this->move();
|
|
$checkEmpty = $result->getType() === AFPData::DEMPTY;
|
|
$this->doLevelSpecialWords( $result );
|
|
if ( $checkEmpty && $result->getType() === AFPData::DEMPTY ) {
|
|
$this->logEmptyOperand( 'bool inversion' );
|
|
}
|
|
if ( $this->mShortCircuit ) {
|
|
// The result doesn't matter.
|
|
return;
|
|
}
|
|
$result = $result->boolInvert();
|
|
} else {
|
|
$this->doLevelSpecialWords( $result );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles keywords (in, like, rlike, contains, ...)
|
|
*
|
|
* @param AFPData &$result
|
|
*/
|
|
protected function doLevelSpecialWords( &$result ) {
|
|
$this->doLevelUnarys( $result );
|
|
$keyword = strtolower( $this->mCur->value );
|
|
if ( $this->mCur->type === AFPToken::TKEYWORD
|
|
&& isset( self::KEYWORDS[$keyword] )
|
|
) {
|
|
$this->move();
|
|
$r2 = new AFPData( AFPData::DEMPTY );
|
|
$this->doLevelUnarys( $r2 );
|
|
|
|
if ( $r2->getType() === AFPData::DEMPTY ) {
|
|
$this->logEmptyOperand( 'keyword operand' );
|
|
}
|
|
|
|
if ( $this->mShortCircuit ) {
|
|
// The result doesn't matter.
|
|
return;
|
|
}
|
|
|
|
$result = $this->callKeyword( $keyword, $result, $r2 );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles unary plus and minus, like in -5 or -(2 * +2)
|
|
*
|
|
* @param AFPData &$result
|
|
*/
|
|
protected function doLevelUnarys( &$result ) {
|
|
$op = $this->mCur->value;
|
|
if ( $this->mCur->type === AFPToken::TOP && ( $op === "+" || $op === "-" ) ) {
|
|
$this->move();
|
|
$checkEmpty = $result->getType() === AFPData::DEMPTY;
|
|
$this->doLevelArrayElements( $result );
|
|
if ( $checkEmpty && $result->getType() === AFPData::DEMPTY ) {
|
|
$this->logEmptyOperand( 'unary operand' );
|
|
}
|
|
if ( $this->mShortCircuit ) {
|
|
// The result doesn't matter.
|
|
return;
|
|
}
|
|
if ( $op === '-' ) {
|
|
$result = $result->unaryMinus();
|
|
}
|
|
} else {
|
|
$this->doLevelArrayElements( $result );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles array elements, parsing expressions like array[number]
|
|
*
|
|
* @param AFPData &$result
|
|
* @throws AFPUserVisibleException
|
|
*/
|
|
protected function doLevelArrayElements( &$result ) {
|
|
$this->doLevelBraces( $result );
|
|
while ( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === '[' ) {
|
|
$idx = new AFPData( AFPData::DEMPTY );
|
|
$this->doLevelSemicolon( $idx );
|
|
if ( !( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === ']' ) ) {
|
|
throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos,
|
|
[ ']', $this->mCur->type, $this->mCur->value ] );
|
|
}
|
|
|
|
if ( $result->getType() === AFPData::DARRAY && $idx->getType() !== AFPData::DUNDEFINED ) {
|
|
$idx = $idx->toInt();
|
|
if ( count( $result->getData() ) <= $idx ) {
|
|
throw new AFPUserVisibleException( 'outofbounds', $this->mCur->pos,
|
|
[ $idx, count( $result->getData() ) ] );
|
|
} elseif ( $idx < 0 ) {
|
|
throw new AFPUserVisibleException( 'negativeindex', $this->mCur->pos, [ $idx ] );
|
|
}
|
|
// @phan-suppress-next-line PhanTypeArraySuspiciousNullable Guaranteed to be array
|
|
$result = $result->getData()[$idx];
|
|
} elseif (
|
|
$result->getType() === AFPData::DUNDEFINED ||
|
|
$idx->getType() === AFPData::DUNDEFINED
|
|
) {
|
|
$result = new AFPData( AFPData::DUNDEFINED );
|
|
} else {
|
|
throw new AFPUserVisibleException( 'notarray', $this->mCur->pos, [] );
|
|
}
|
|
$this->move();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles brackets, only ( and )
|
|
*
|
|
* @param AFPData &$result
|
|
* @throws AFPUserVisibleException
|
|
*/
|
|
protected function doLevelBraces( &$result ) {
|
|
if ( $this->mCur->type === AFPToken::TBRACE && $this->mCur->value === '(' ) {
|
|
$next = $this->getNextToken();
|
|
if ( $next->type === AFPToken::TBRACE && $next->value === ')' ) {
|
|
$this->logEmptyOperand( 'parenthesized expression' );
|
|
// We don't need DUNDEFINED here
|
|
$this->move();
|
|
// @phan-suppress-next-line PhanPluginDuplicateAdjacentStatement
|
|
$this->move();
|
|
} else {
|
|
if ( $this->mShortCircuit ) {
|
|
$result = new AFPData( AFPData::DUNDEFINED );
|
|
$this->skipOverBraces();
|
|
} else {
|
|
$this->doLevelSemicolon( $result );
|
|
}
|
|
if ( !( $this->mCur->type === AFPToken::TBRACE && $this->mCur->value === ')' ) ) {
|
|
throw new AFPUserVisibleException(
|
|
'expectednotfound',
|
|
$this->mCur->pos,
|
|
[ ')', $this->mCur->type, $this->mCur->value ]
|
|
);
|
|
}
|
|
$this->move();
|
|
}
|
|
} else {
|
|
$this->doLevelFunction( $result );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles functions
|
|
*
|
|
* @param AFPData &$result
|
|
* @throws AFPUserVisibleException
|
|
*/
|
|
protected function doLevelFunction( &$result ) {
|
|
if ( $this->mCur->type === AFPToken::TID && isset( self::FUNCTIONS[$this->mCur->value] ) ) {
|
|
$fname = $this->mCur->value;
|
|
$this->move();
|
|
if ( $this->mCur->type !== AFPToken::TBRACE || $this->mCur->value !== '(' ) {
|
|
throw new AFPUserVisibleException( 'expectednotfound',
|
|
$this->mCur->pos,
|
|
[
|
|
'(',
|
|
$this->mCur->type,
|
|
$this->mCur->value
|
|
]
|
|
);
|
|
}
|
|
|
|
if ( $this->mShortCircuit ) {
|
|
$result = new AFPData( AFPData::DUNDEFINED );
|
|
$this->skipOverBraces();
|
|
$this->move();
|
|
|
|
// The result doesn't matter.
|
|
return;
|
|
}
|
|
|
|
$args = [];
|
|
$next = $this->getNextToken();
|
|
if ( $next->type !== AFPToken::TBRACE || $next->value !== ')' ) {
|
|
if ( ( $fname === 'set' || $fname === 'set_var' ) ) {
|
|
$state = $this->getState();
|
|
$this->move();
|
|
$next = $this->getNextToken();
|
|
if (
|
|
$this->mCur->type !== AFPToken::TSTRING ||
|
|
(
|
|
$next->type !== AFPToken::TCOMMA &&
|
|
// Let this fail later, when checking parameters count
|
|
!( $next->type === AFPToken::TBRACE && $next->value === ')' )
|
|
)
|
|
) {
|
|
throw new AFPUserVisibleException( 'variablevariable', $this->mCur->pos, [] );
|
|
} else {
|
|
$this->setState( $state );
|
|
}
|
|
}
|
|
do {
|
|
$r = new AFPData( AFPData::DEMPTY );
|
|
$this->doLevelSemicolon( $r );
|
|
if ( $r->getType() === AFPData::DEMPTY && !$this->functionIsVariadic( $fname ) ) {
|
|
$this->logEmptyOperand( 'non-variadic function argument' );
|
|
}
|
|
$args[] = $r;
|
|
} while ( $this->mCur->type === AFPToken::TCOMMA );
|
|
} else {
|
|
$this->move();
|
|
}
|
|
|
|
if ( $this->mCur->type !== AFPToken::TBRACE || $this->mCur->value !== ')' ) {
|
|
throw new AFPUserVisibleException( 'expectednotfound',
|
|
$this->mCur->pos,
|
|
[
|
|
')',
|
|
$this->mCur->type,
|
|
$this->mCur->value
|
|
]
|
|
);
|
|
}
|
|
$this->move();
|
|
|
|
$result = $this->callFunc( $fname, $args );
|
|
} else {
|
|
$this->doLevelAtom( $result );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles the return value
|
|
*
|
|
* @param AFPData &$result
|
|
* @throws AFPUserVisibleException
|
|
*/
|
|
protected function doLevelAtom( &$result ) {
|
|
$tok = $this->mCur->value;
|
|
switch ( $this->mCur->type ) {
|
|
case AFPToken::TID:
|
|
if ( $this->mShortCircuit ) {
|
|
$result = new AFPData( AFPData::DUNDEFINED );
|
|
} else {
|
|
$var = strtolower( $tok );
|
|
$result = $this->getVarValue( $var );
|
|
}
|
|
break;
|
|
case AFPToken::TSTRING:
|
|
$result = new AFPData( AFPData::DSTRING, $tok );
|
|
break;
|
|
case AFPToken::TFLOAT:
|
|
$result = new AFPData( AFPData::DFLOAT, $tok );
|
|
break;
|
|
case AFPToken::TINT:
|
|
$result = new AFPData( AFPData::DINT, $tok );
|
|
break;
|
|
case AFPToken::TKEYWORD:
|
|
if ( $tok === "true" ) {
|
|
$result = new AFPData( AFPData::DBOOL, true );
|
|
} elseif ( $tok === "false" ) {
|
|
$result = new AFPData( AFPData::DBOOL, false );
|
|
} elseif ( $tok === "null" ) {
|
|
$result = new AFPData( AFPData::DNULL );
|
|
} else {
|
|
throw new AFPUserVisibleException(
|
|
'unrecognisedkeyword',
|
|
$this->mCur->pos,
|
|
[ $tok ]
|
|
);
|
|
}
|
|
break;
|
|
case AFPToken::TNONE:
|
|
// Handled at entry level
|
|
return;
|
|
case AFPToken::TBRACE:
|
|
if ( $this->mCur->value === ')' ) {
|
|
// Handled at the entry level
|
|
return;
|
|
}
|
|
// Intentional fall-through
|
|
case AFPToken::TSQUAREBRACKET:
|
|
if ( $this->mCur->value === '[' ) {
|
|
$array = [];
|
|
while ( true ) {
|
|
$this->move();
|
|
if ( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === ']' ) {
|
|
break;
|
|
}
|
|
$item = new AFPData( AFPData::DEMPTY );
|
|
$this->doLevelSet( $item );
|
|
$array[] = $item;
|
|
if ( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === ']' ) {
|
|
break;
|
|
}
|
|
if ( $this->mCur->type !== AFPToken::TCOMMA ) {
|
|
throw new AFPUserVisibleException(
|
|
'expectednotfound',
|
|
$this->mCur->pos,
|
|
[ ', or ]', $this->mCur->type, $this->mCur->value ]
|
|
);
|
|
}
|
|
}
|
|
$result = new AFPData( AFPData::DARRAY, $array );
|
|
break;
|
|
}
|
|
// Intentional fall-through
|
|
default:
|
|
throw new AFPUserVisibleException(
|
|
'unexpectedtoken',
|
|
$this->mCur->pos,
|
|
[
|
|
$this->mCur->type,
|
|
$this->mCur->value
|
|
]
|
|
);
|
|
}
|
|
$this->move();
|
|
}
|
|
|
|
/* End of levels */
|
|
|
|
/**
|
|
* Check whether a variable exists, being either built-in or user-defined. Doesn't include
|
|
* disabled variables.
|
|
*
|
|
* @param string $varname
|
|
* @return bool
|
|
*/
|
|
protected function varExists( $varname ) {
|
|
return $this->keywordsManager->isVarInUse( $varname ) ||
|
|
$this->mVariables->varIsSet( $varname );
|
|
}
|
|
|
|
/**
|
|
* @param string $var
|
|
* @return AFPData
|
|
* @throws AFPUserVisibleException
|
|
*/
|
|
protected function getVarValue( $var ) {
|
|
$var = strtolower( $var );
|
|
$deprecatedVars = $this->keywordsManager->getDeprecatedVariables();
|
|
|
|
if ( array_key_exists( $var, $deprecatedVars ) ) {
|
|
if ( $this->logsDeprecatedVars() ) {
|
|
$this->logger->debug( "Deprecated variable $var used in filter {$this->mFilter}." );
|
|
}
|
|
$var = $deprecatedVars[ $var ];
|
|
}
|
|
if ( $this->keywordsManager->isVarDisabled( $var ) ) {
|
|
throw new AFPUserVisibleException(
|
|
'disabledvar',
|
|
$this->mCur->pos,
|
|
[ $var ]
|
|
);
|
|
}
|
|
if ( !$this->varExists( $var ) ) {
|
|
throw new AFPUserVisibleException(
|
|
'unrecognisedvar',
|
|
$this->mCur->pos,
|
|
[ $var ]
|
|
);
|
|
}
|
|
|
|
// It's a built-in, non-disabled variable (either set or unset), or a set custom variable
|
|
$flags = $this->allowMissingVariables
|
|
? AbuseFilterVariableHolder::GET_LAX
|
|
// TODO: This should be GET_STRICT, but that's going to be very hard (see T230256)
|
|
: AbuseFilterVariableHolder::GET_BC;
|
|
return $this->mVariables->getVar( $var, $flags, $this->mFilter );
|
|
}
|
|
|
|
/**
|
|
* Whether this parser should log deprecated vars use.
|
|
* @return bool
|
|
*/
|
|
protected function logsDeprecatedVars() {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @param string $name
|
|
* @param mixed $value
|
|
* @throws AFPUserVisibleException
|
|
*/
|
|
protected function setUserVariable( $name, $value ) {
|
|
if ( $this->isReservedIdentifier( $name ) ) {
|
|
throw new AFPUserVisibleException( 'overridebuiltin', $this->mCur->pos, [ $name ] );
|
|
}
|
|
$this->mVariables->setVar( $name, $value );
|
|
}
|
|
|
|
/**
|
|
* Helper to call a built-in function.
|
|
*
|
|
* @param string $fname The name of the function as found in the filter code
|
|
* @param AFPData[] $args Arguments for the function
|
|
* @return AFPData The return value of the function
|
|
* @throws InvalidArgumentException if given an invalid func
|
|
*/
|
|
protected function callFunc( $fname, array $args ) : AFPData {
|
|
if ( !array_key_exists( $fname, self::FUNCTIONS ) ) {
|
|
// @codeCoverageIgnoreStart
|
|
throw new InvalidArgumentException( "$fname is not a valid function." );
|
|
// @codeCoverageIgnoreEnd
|
|
}
|
|
|
|
$funcHandler = self::FUNCTIONS[$fname];
|
|
$funcHash = md5( $funcHandler . serialize( $args ) );
|
|
|
|
if ( isset( $this->funcCache[$funcHash] ) &&
|
|
!in_array( $funcHandler, self::ACTIVE_FUNCTIONS )
|
|
) {
|
|
$result = $this->funcCache[$funcHash];
|
|
} else {
|
|
$this->checkArgCount( $args, $fname );
|
|
$this->raiseCondCount();
|
|
|
|
// Any undefined argument should be special-cased by the function, but that would be too
|
|
// much overhead. We also cannot skip calling the handler in case it's making further
|
|
// validation (T234339). So temporarily replace the DUNDEFINED with a DNULL.
|
|
// @todo This is subpar.
|
|
$hasUndefinedArg = false;
|
|
foreach ( $args as $i => $arg ) {
|
|
if ( $arg->hasUndefined() ) {
|
|
$args[$i] = $arg->cloneAsUndefinedReplacedWithNull();
|
|
$hasUndefinedArg = true;
|
|
}
|
|
}
|
|
if ( $hasUndefinedArg ) {
|
|
$this->$funcHandler( $args );
|
|
$result = new AFPData( AFPData::DUNDEFINED );
|
|
} else {
|
|
$result = $this->$funcHandler( $args );
|
|
}
|
|
$this->funcCache[$funcHash] = $result;
|
|
}
|
|
|
|
if ( count( $this->funcCache ) > 1000 ) {
|
|
// @codeCoverageIgnoreStart
|
|
$this->clearFuncCache();
|
|
// @codeCoverageIgnoreEnd
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Helper to invoke a built-in keyword. Note that this assumes that $kname is
|
|
* a valid keyword name.
|
|
*
|
|
* @param string $kname
|
|
* @param AFPData $lhs
|
|
* @param AFPData $rhs
|
|
* @return AFPData
|
|
*/
|
|
protected function callKeyword( $kname, AFPData $lhs, AFPData $rhs ) : AFPData {
|
|
$func = self::KEYWORDS[$kname];
|
|
$this->raiseCondCount();
|
|
|
|
$hasUndefinedOperand = false;
|
|
if ( $lhs->hasUndefined() ) {
|
|
$lhs = $lhs->cloneAsUndefinedReplacedWithNull();
|
|
$hasUndefinedOperand = true;
|
|
}
|
|
if ( $rhs->hasUndefined() ) {
|
|
$rhs = $rhs->cloneAsUndefinedReplacedWithNull();
|
|
$hasUndefinedOperand = true;
|
|
}
|
|
if ( $hasUndefinedOperand ) {
|
|
// We need to run the handler with bogus args, see the comment in self::callFunc (T234339)
|
|
// @todo Likewise, this is subpar.
|
|
// @phan-suppress-next-line PhanParamTooMany Not every function needs the position
|
|
$this->$func( $lhs, $rhs, $this->mCur->pos );
|
|
$result = new AFPData( AFPData::DUNDEFINED );
|
|
} else {
|
|
// @phan-suppress-next-line PhanParamTooMany Not every function needs the position
|
|
$result = $this->$func( $lhs, $rhs, $this->mCur->pos );
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
// Built-in functions
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcLc( $args ) {
|
|
$s = $args[0]->toString();
|
|
|
|
return new AFPData( AFPData::DSTRING, $this->contLang->lc( $s ) );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcUc( $args ) {
|
|
$s = $args[0]->toString();
|
|
|
|
return new AFPData( AFPData::DSTRING, $this->contLang->uc( $s ) );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcLen( $args ) {
|
|
if ( $args[0]->type === AFPData::DARRAY ) {
|
|
// Don't use toString on arrays, but count
|
|
$val = count( $args[0]->data );
|
|
} else {
|
|
$val = mb_strlen( $args[0]->toString(), 'utf-8' );
|
|
}
|
|
|
|
return new AFPData( AFPData::DINT, $val );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcSpecialRatio( $args ) {
|
|
$s = $args[0]->toString();
|
|
|
|
if ( !strlen( $s ) ) {
|
|
return new AFPData( AFPData::DFLOAT, 0 );
|
|
}
|
|
|
|
$nospecials = $this->rmspecials( $s );
|
|
|
|
$val = 1. - ( ( mb_strlen( $nospecials ) / mb_strlen( $s ) ) );
|
|
|
|
return new AFPData( AFPData::DFLOAT, $val );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcCount( $args ) {
|
|
if ( $args[0]->type === AFPData::DARRAY && count( $args ) === 1 ) {
|
|
return new AFPData( AFPData::DINT, count( $args[0]->data ) );
|
|
}
|
|
|
|
if ( count( $args ) === 1 ) {
|
|
$count = count( explode( ',', $args[0]->toString() ) );
|
|
} else {
|
|
$needle = $args[0]->toString();
|
|
$haystack = $args[1]->toString();
|
|
|
|
// T62203: Keep empty parameters from causing PHP warnings
|
|
if ( $needle === '' ) {
|
|
$count = 0;
|
|
} else {
|
|
$count = substr_count( $haystack, $needle );
|
|
}
|
|
}
|
|
|
|
return new AFPData( AFPData::DINT, $count );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
* @throws AFPUserVisibleException
|
|
*/
|
|
protected function funcRCount( $args ) {
|
|
if ( count( $args ) === 1 ) {
|
|
$count = count( explode( ',', $args[0]->toString() ) );
|
|
} else {
|
|
$needle = $args[0]->toString();
|
|
$haystack = $args[1]->toString();
|
|
|
|
// Munge the regex
|
|
$needle = preg_replace( '!(\\\\\\\\)*(\\\\)?/!', '$1\/', $needle );
|
|
$needle = "/$needle/u";
|
|
|
|
// Suppress and restore needed per T177744
|
|
AtEase::suppressWarnings();
|
|
$this->checkRegexMatchesEmpty( $needle );
|
|
$count = preg_match_all( $needle, $haystack );
|
|
AtEase::restoreWarnings();
|
|
|
|
if ( $count === false ) {
|
|
throw new AFPUserVisibleException(
|
|
'regexfailure',
|
|
$this->mCur->pos,
|
|
[ $needle ]
|
|
);
|
|
}
|
|
}
|
|
|
|
return new AFPData( AFPData::DINT, $count );
|
|
}
|
|
|
|
/**
|
|
* Returns an array of matches of needle in the haystack, the first one for the whole regex,
|
|
* the other ones for every capturing group.
|
|
*
|
|
* @param array $args
|
|
* @return AFPData An array of matches.
|
|
* @throws AFPUserVisibleException
|
|
*/
|
|
protected function funcGetMatches( $args ) {
|
|
$needle = $args[0]->toString();
|
|
$haystack = $args[1]->toString();
|
|
|
|
// Count the amount of capturing groups in the submitted pattern.
|
|
// This way we can return a fixed-dimension array, much easier to manage.
|
|
// ToDo: Find a better way to do this.
|
|
// First, strip away escaped parentheses
|
|
$sanitized = preg_replace( '/(\\\\\\\\)*\\\\\(/', '', $needle );
|
|
// Then strip starting parentheses of non-capturing groups, including
|
|
// atomics, lookaheads and so on, even if not every of them is supported.
|
|
$sanitized = str_replace( '(?', '', $sanitized );
|
|
// And also strip "(*", used with backtracking verbs like (*FAIL)
|
|
$sanitized = str_replace( '(*', '', $sanitized );
|
|
// Finally create an array of falses with dimension = # of capturing groups
|
|
$groupscount = substr_count( $sanitized, '(' ) + 1;
|
|
$falsy = array_fill( 0, $groupscount, false );
|
|
|
|
// Munge the regex by escaping slashes
|
|
$needle = preg_replace( '!(\\\\\\\\)*(\\\\)?/!', '$1\/', $needle );
|
|
$needle = "/$needle/u";
|
|
|
|
// Suppress and restore are here for the same reason as T177744
|
|
AtEase::suppressWarnings();
|
|
$this->checkRegexMatchesEmpty( $needle );
|
|
$check = preg_match( $needle, $haystack, $matches );
|
|
AtEase::restoreWarnings();
|
|
|
|
if ( $check === false ) {
|
|
throw new AFPUserVisibleException(
|
|
'regexfailure',
|
|
$this->mCur->pos,
|
|
[ $needle ]
|
|
);
|
|
}
|
|
|
|
// Returned array has non-empty positions identical to the ones returned
|
|
// by the third parameter of a standard preg_match call ($matches in this case).
|
|
// We want an union with falsy to return a fixed-dimension array.
|
|
return AFPData::newFromPHPVar( $matches + $falsy );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
* @throws AFPUserVisibleException
|
|
*/
|
|
protected function funcIPInRange( $args ) {
|
|
$ip = $args[0]->toString();
|
|
$range = $args[1]->toString();
|
|
|
|
if ( !IPUtils::isValidRange( $range ) ) {
|
|
throw new AFPUserVisibleException(
|
|
'invalidiprange',
|
|
$this->mCur->pos,
|
|
[ $range ]
|
|
);
|
|
}
|
|
|
|
$result = IPUtils::isInRange( $ip, $range );
|
|
|
|
return new AFPData( AFPData::DBOOL, $result );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcCCNorm( $args ) {
|
|
$s = $args[0]->toString();
|
|
|
|
$s = html_entity_decode( $s, ENT_QUOTES, 'UTF-8' );
|
|
$s = $this->ccnorm( $s );
|
|
|
|
return new AFPData( AFPData::DSTRING, $s );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcSanitize( $args ) {
|
|
$s = $args[0]->toString();
|
|
|
|
$s = html_entity_decode( $s, ENT_QUOTES, 'UTF-8' );
|
|
$s = Sanitizer::decodeCharReferences( $s );
|
|
|
|
return new AFPData( AFPData::DSTRING, $s );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcContainsAny( $args ) {
|
|
$s = array_shift( $args );
|
|
|
|
return new AFPData( AFPData::DBOOL, self::contains( $s, $args, true ) );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcContainsAll( $args ) {
|
|
$s = array_shift( $args );
|
|
|
|
return new AFPData( AFPData::DBOOL, self::contains( $s, $args, false, false ) );
|
|
}
|
|
|
|
/**
|
|
* Normalize and search a string for multiple substrings in OR mode
|
|
*
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcCCNormContainsAny( $args ) {
|
|
$s = array_shift( $args );
|
|
|
|
return new AFPData( AFPData::DBOOL, self::contains( $s, $args, true, true ) );
|
|
}
|
|
|
|
/**
|
|
* Normalize and search a string for multiple substrings in AND mode
|
|
*
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcCCNormContainsAll( $args ) {
|
|
$s = array_shift( $args );
|
|
|
|
return new AFPData( AFPData::DBOOL, self::contains( $s, $args, false, true ) );
|
|
}
|
|
|
|
/**
|
|
* Search for substrings in a string
|
|
*
|
|
* Use is_any to determine wether to use logic OR (true) or AND (false).
|
|
*
|
|
* Use normalize = true to make use of ccnorm and
|
|
* normalize both sides of the search.
|
|
*
|
|
* @param AFPData $string
|
|
* @param AFPData[] $values
|
|
* @param bool $is_any
|
|
* @param bool $normalize
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected static function contains( $string, $values, $is_any = true, $normalize = false ) {
|
|
$string = $string->toString();
|
|
|
|
if ( $string === '' ) {
|
|
return false;
|
|
}
|
|
|
|
if ( $normalize ) {
|
|
$string = self::ccnorm( $string );
|
|
}
|
|
|
|
foreach ( $values as $needle ) {
|
|
$needle = $needle->toString();
|
|
if ( $normalize ) {
|
|
$needle = self::ccnorm( $needle );
|
|
}
|
|
if ( $needle === '' ) {
|
|
// T62203: Keep empty parameters from causing PHP warnings
|
|
continue;
|
|
}
|
|
|
|
$is_found = strpos( $string, $needle ) !== false;
|
|
if ( $is_found === $is_any ) {
|
|
// If I'm here and it's ANY (OR) => something is found.
|
|
// If I'm here and it's ALL (AND) => nothing is found.
|
|
// In both cases, we've had enough.
|
|
return $is_found;
|
|
}
|
|
}
|
|
|
|
// If I'm here and it's ANY (OR) => nothing was found: return false ($is_any is true)
|
|
// If I'm here and it's ALL (AND) => everything was found: return true ($is_any is false)
|
|
return !$is_any;
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcEqualsToAny( $args ) {
|
|
$s = array_shift( $args );
|
|
|
|
return new AFPData( AFPData::DBOOL, self::equalsToAny( $s, $args ) );
|
|
}
|
|
|
|
/**
|
|
* Check if the given string is equals to any of the following strings
|
|
*
|
|
* @param AFPData $string
|
|
* @param AFPData[] $values
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected static function equalsToAny( $string, $values ) {
|
|
foreach ( $values as $needle ) {
|
|
if ( $string->equals( $needle, true ) ) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @param string $s
|
|
* @return mixed
|
|
*/
|
|
protected static function ccnorm( $s ) {
|
|
// Instantiate a single version of the equivset so the data is only loaded once.
|
|
if ( !self::$equivset ) {
|
|
self::$equivset = new Equivset();
|
|
}
|
|
|
|
return self::$equivset->normalize( $s );
|
|
}
|
|
|
|
/**
|
|
* @param string $s
|
|
* @return array|string
|
|
*/
|
|
protected function rmspecials( $s ) {
|
|
return preg_replace( '/[^\p{L}\p{N}]/u', '', $s );
|
|
}
|
|
|
|
/**
|
|
* @param string $s
|
|
* @return array|string
|
|
*/
|
|
protected function rmdoubles( $s ) {
|
|
return preg_replace( '/(.)\1+/us', '\1', $s );
|
|
}
|
|
|
|
/**
|
|
* @param string $s
|
|
* @return array|string
|
|
*/
|
|
protected function rmwhitespace( $s ) {
|
|
return preg_replace( '/\s+/u', '', $s );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcRMSpecials( $args ) {
|
|
$s = $args[0]->toString();
|
|
|
|
return new AFPData( AFPData::DSTRING, $this->rmspecials( $s ) );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcRMWhitespace( $args ) {
|
|
$s = $args[0]->toString();
|
|
|
|
return new AFPData( AFPData::DSTRING, $this->rmwhitespace( $s ) );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcRMDoubles( $args ) {
|
|
$s = $args[0]->toString();
|
|
|
|
return new AFPData( AFPData::DSTRING, $this->rmdoubles( $s ) );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcNorm( $args ) {
|
|
$s = $args[0]->toString();
|
|
|
|
$s = $this->ccnorm( $s );
|
|
$s = $this->rmdoubles( $s );
|
|
$s = $this->rmspecials( $s );
|
|
$s = $this->rmwhitespace( $s );
|
|
|
|
return new AFPData( AFPData::DSTRING, $s );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcSubstr( $args ) {
|
|
$s = $args[0]->toString();
|
|
$offset = $args[1]->toInt();
|
|
$length = isset( $args[2] ) ? $args[2]->toInt() : null;
|
|
|
|
$result = mb_substr( $s, $offset, $length );
|
|
|
|
return new AFPData( AFPData::DSTRING, $result );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcStrPos( $args ) {
|
|
$haystack = $args[0]->toString();
|
|
$needle = $args[1]->toString();
|
|
$offset = isset( $args[2] ) ? $args[2]->toInt() : 0;
|
|
|
|
// T62203: Keep empty parameters from causing PHP warnings
|
|
if ( $needle === '' ) {
|
|
return new AFPData( AFPData::DINT, -1 );
|
|
}
|
|
|
|
$result = mb_strpos( $haystack, $needle, $offset );
|
|
|
|
if ( $result === false ) {
|
|
$result = -1;
|
|
}
|
|
|
|
return new AFPData( AFPData::DINT, $result );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcStrReplace( $args ) {
|
|
$subject = $args[0]->toString();
|
|
$search = $args[1]->toString();
|
|
$replace = $args[2]->toString();
|
|
|
|
return new AFPData( AFPData::DSTRING, str_replace( $search, $replace, $subject ) );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function funcStrRegexEscape( $args ) {
|
|
$string = $args[0]->toString();
|
|
|
|
// preg_quote does not need the second parameter, since rlike takes
|
|
// care of the delimiter symbol itself
|
|
return new AFPData( AFPData::DSTRING, preg_quote( $string ) );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return mixed
|
|
*/
|
|
protected function funcSetVar( $args ) {
|
|
$varName = $args[0]->toString();
|
|
$value = $args[1];
|
|
|
|
$this->setUserVariable( $varName, $value );
|
|
|
|
return $value;
|
|
}
|
|
|
|
/**
|
|
* Checks if $a contains $b
|
|
*
|
|
* @param AFPData $a
|
|
* @param AFPData $b
|
|
* @return AFPData
|
|
*/
|
|
protected function containmentKeyword( AFPData $a, AFPData $b ) {
|
|
$a = $a->toString();
|
|
$b = $b->toString();
|
|
|
|
if ( $a === '' || $b === '' ) {
|
|
return new AFPData( AFPData::DBOOL, false );
|
|
}
|
|
|
|
return new AFPData( AFPData::DBOOL, strpos( $a, $b ) !== false );
|
|
}
|
|
|
|
/**
|
|
* @param AFPData $a
|
|
* @param AFPData $b
|
|
* @return AFPData
|
|
*/
|
|
protected function keywordIn( AFPData $a, AFPData $b ) {
|
|
return $this->containmentKeyword( $b, $a );
|
|
}
|
|
|
|
/**
|
|
* @param AFPData $a
|
|
* @param AFPData $b
|
|
* @return AFPData
|
|
*/
|
|
protected function keywordContains( AFPData $a, AFPData $b ) {
|
|
return $this->containmentKeyword( $a, $b );
|
|
}
|
|
|
|
/**
|
|
* @param AFPData $str
|
|
* @param AFPData $pattern
|
|
* @return AFPData
|
|
*/
|
|
protected function keywordLike( AFPData $str, AFPData $pattern ) {
|
|
$str = $str->toString();
|
|
$pattern = '#^' . strtr( preg_quote( $pattern->toString(), '#' ), AFPData::WILDCARD_MAP ) . '$#u';
|
|
AtEase::suppressWarnings();
|
|
$result = preg_match( $pattern, $str );
|
|
AtEase::restoreWarnings();
|
|
|
|
return new AFPData( AFPData::DBOOL, (bool)$result );
|
|
}
|
|
|
|
/**
|
|
* @param AFPData $str
|
|
* @param AFPData $regex
|
|
* @param int $pos
|
|
* @param bool $insensitive
|
|
* @return AFPData
|
|
* @throws Exception
|
|
*/
|
|
protected function keywordRegex( AFPData $str, AFPData $regex, $pos, $insensitive = false ) {
|
|
$str = $str->toString();
|
|
$pattern = $regex->toString();
|
|
|
|
$pattern = preg_replace( '!(\\\\\\\\)*(\\\\)?/!', '$1\/', $pattern );
|
|
$pattern = "/$pattern/u";
|
|
|
|
if ( $insensitive ) {
|
|
$pattern .= 'i';
|
|
}
|
|
|
|
AtEase::suppressWarnings();
|
|
$this->checkRegexMatchesEmpty( $pattern );
|
|
$result = preg_match( $pattern, $str );
|
|
AtEase::restoreWarnings();
|
|
if ( $result === false ) {
|
|
throw new AFPUserVisibleException(
|
|
'regexfailure',
|
|
// Coverage bug
|
|
// @codeCoverageIgnoreStart
|
|
$pos,
|
|
// @codeCoverageIgnoreEnd
|
|
[ $pattern ]
|
|
);
|
|
}
|
|
|
|
return new AFPData( AFPData::DBOOL, (bool)$result );
|
|
}
|
|
|
|
/**
|
|
* @param AFPData $str
|
|
* @param AFPData $regex
|
|
* @param int $pos
|
|
* @return AFPData
|
|
*/
|
|
protected function keywordRegexInsensitive( AFPData $str, AFPData $regex, $pos ) {
|
|
return $this->keywordRegex( $str, $regex, $pos, true );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function castString( $args ) {
|
|
return AFPData::castTypes( $args[0], AFPData::DSTRING );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function castInt( $args ) {
|
|
return AFPData::castTypes( $args[0], AFPData::DINT );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function castFloat( $args ) {
|
|
return AFPData::castTypes( $args[0], AFPData::DFLOAT );
|
|
}
|
|
|
|
/**
|
|
* @param array $args
|
|
* @return AFPData
|
|
*/
|
|
protected function castBool( $args ) {
|
|
return AFPData::castTypes( $args[0], AFPData::DBOOL );
|
|
}
|
|
|
|
/**
|
|
* Log empty operands for T156096
|
|
*
|
|
* @param string $type Type of the empty operand
|
|
*/
|
|
protected function logEmptyOperand( $type ) {
|
|
if ( $this->mFilter !== null ) {
|
|
$this->logger->warning(
|
|
'DEPRECATED! Found empty operand of type `{op_type}` when parsing filter: {filter}. ' .
|
|
'This is deprecated since 1.34 and support will be discontinued soon. Please fix ' .
|
|
'the affected filter!',
|
|
[
|
|
'op_type' => $type,
|
|
'filter' => $this->mFilter
|
|
]
|
|
);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check whether the provided regex matches the empty string.
|
|
* @note This method can generate a PHP notice if the regex is invalid
|
|
*
|
|
* @param string $regex
|
|
*/
|
|
protected function checkRegexMatchesEmpty( string $regex ) : void {
|
|
// @phan-suppress-next-line PhanParamSuspiciousOrder
|
|
if ( preg_match( $regex, '' ) === 1 ) {
|
|
$this->warnings[] = new UserVisibleWarning(
|
|
'match-empty-regex',
|
|
$this->mCur->pos,
|
|
[]
|
|
);
|
|
}
|
|
}
|
|
}
|