mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/AbuseFilter.git
synced 2024-11-15 10:15:24 +00:00
741 lines
18 KiB
PHP
741 lines
18 KiB
PHP
<?php
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/**
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* A version of the abuse filter parser that separates parsing the filter and
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* evaluating it into different passes, allowing the parse tree to be cached.
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*
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* @file
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* @phan-file-suppress PhanPossiblyInfiniteRecursionSameParams Recursion controlled by class props
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*/
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namespace MediaWiki\Extension\AbuseFilter\Parser;
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use IBufferingStatsdDataFactory;
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use InvalidArgumentException;
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use MediaWiki\Extension\AbuseFilter\KeywordsManager;
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use MediaWiki\Extension\AbuseFilter\Parser\Exception\UserVisibleException;
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use Psr\Log\LoggerInterface;
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/**
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* A parser that transforms the text of the filter into a parse tree.
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*/
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class AFPTreeParser {
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/**
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* @var array[] Contains the AFPTokens for the code being parsed
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* @phan-var array<int,array{0:AFPToken,1:int}>
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*/
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private $mTokens;
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/**
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* @var AFPToken The current token
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*/
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private $mCur;
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/** @var int The position of the current token */
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private $mPos;
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/**
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* @var string|null The ID of the filter being parsed, if available. Can also be "global-$ID"
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*/
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private $mFilter;
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public const CACHE_VERSION = 2;
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/**
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* @var LoggerInterface Used for debugging
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*/
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private $logger;
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/**
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* @var IBufferingStatsdDataFactory
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*/
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private $statsd;
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/** @var KeywordsManager */
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private $keywordsManager;
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/**
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* @param LoggerInterface $logger Used for debugging
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* @param IBufferingStatsdDataFactory $statsd
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* @param KeywordsManager $keywordsManager
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*/
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public function __construct(
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LoggerInterface $logger,
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IBufferingStatsdDataFactory $statsd,
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KeywordsManager $keywordsManager
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) {
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$this->logger = $logger;
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$this->statsd = $statsd;
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$this->keywordsManager = $keywordsManager;
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$this->resetState();
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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 = $filter;
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}
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/**
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* Resets the state
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*/
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private function resetState() {
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$this->mTokens = [];
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$this->mPos = 0;
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$this->mFilter = null;
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}
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/**
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* Advances the parser to the next token in the filter code.
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*/
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private 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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private 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
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* back.
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*
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* @return AFPParserState
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*/
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private 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
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* back.
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*
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* @param AFPParserState $state
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*/
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private 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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* Parse the supplied filter source code into a tree.
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*
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* @param array[] $tokens
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* @phan-param array<int,array{0:AFPToken,1:int}> $tokens
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* @return AFPSyntaxTree
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* @throws UserVisibleException
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*/
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public function parse( array $tokens ): AFPSyntaxTree {
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$this->mTokens = $tokens;
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$this->mPos = 0;
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return $this->buildSyntaxTree();
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}
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/**
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* @return AFPSyntaxTree
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*/
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private function buildSyntaxTree(): AFPSyntaxTree {
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$startTime = microtime( true );
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$root = $this->doLevelEntry();
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$this->statsd->timing( 'abusefilter_cachingParser_buildtree', microtime( true ) - $startTime );
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return new AFPSyntaxTree( $root );
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}
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/* Levels */
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/**
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* Handles unexpected characters after the expression.
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* @return AFPTreeNode|null Null only if no statements
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* @throws UserVisibleException
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*/
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private function doLevelEntry() {
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$result = $this->doLevelSemicolon();
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if ( $this->mCur->type !== AFPToken::TNONE ) {
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throw new UserVisibleException(
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'unexpectedatend',
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$this->mPos, [ $this->mCur->type ]
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);
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}
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return $result;
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}
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/**
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* Handles the semicolon operator.
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*
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* @return AFPTreeNode|null
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*/
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private function doLevelSemicolon() {
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$statements = [];
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do {
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$this->move();
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$position = $this->mPos;
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if (
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$this->mCur->type === AFPToken::TNONE ||
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( $this->mCur->type === AFPToken::TBRACE && $this->mCur->value == ')' )
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) {
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// Handle special cases which the other parser handled in doLevelAtom
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break;
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}
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// Allow empty statements.
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if ( $this->mCur->type === AFPToken::TSTATEMENTSEPARATOR ) {
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continue;
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}
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$statements[] = $this->doLevelSet();
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$position = $this->mPos;
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} while ( $this->mCur->type === AFPToken::TSTATEMENTSEPARATOR );
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// Flatten the tree if possible.
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if ( count( $statements ) === 0 ) {
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return null;
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} elseif ( count( $statements ) === 1 ) {
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return $statements[0];
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} else {
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return new AFPTreeNode( AFPTreeNode::SEMICOLON, $statements, $position );
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}
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}
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/**
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* Handles variable assignment.
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*
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* @return AFPTreeNode
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* @throws UserVisibleException
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*/
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private function doLevelSet() {
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if ( $this->mCur->type === AFPToken::TID ) {
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$varname = (string)$this->mCur->value;
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// Speculatively parse the assignment statement assuming it can
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// potentially be an assignment, but roll back if it isn't.
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// @todo Use $this->getNextToken for clearer code
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$initialState = $this->getState();
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$this->move();
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if ( $this->mCur->type === AFPToken::TOP && $this->mCur->value === ':=' ) {
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$position = $this->mPos;
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$this->move();
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$value = $this->doLevelSet();
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return new AFPTreeNode( AFPTreeNode::ASSIGNMENT, [ $varname, $value ], $position );
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}
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if ( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === '[' ) {
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$this->move();
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if ( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === ']' ) {
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$index = 'append';
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} else {
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// Parse index offset.
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$this->setState( $initialState );
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$this->move();
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$index = $this->doLevelSemicolon();
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if ( !( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === ']' ) ) {
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throw new UserVisibleException( 'expectednotfound', $this->mPos,
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[ ']', $this->mCur->type, $this->mCur->value ] );
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}
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}
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$this->move();
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if ( $this->mCur->type === AFPToken::TOP && $this->mCur->value === ':=' ) {
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$position = $this->mPos;
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$this->move();
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$value = $this->doLevelSet();
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if ( $index === 'append' ) {
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return new AFPTreeNode(
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AFPTreeNode::ARRAY_APPEND, [ $varname, $value ], $position );
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} else {
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return new AFPTreeNode(
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AFPTreeNode::INDEX_ASSIGNMENT,
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[ $varname, $index, $value ],
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$position
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);
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}
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}
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}
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// If we reached this point, we did not find an assignment. Roll back
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// and assume this was just a literal.
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$this->setState( $initialState );
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}
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return $this->doLevelConditions();
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}
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/**
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* Handles ternary operator and if-then-else-end.
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*
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* @return AFPTreeNode
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* @throws UserVisibleException
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*/
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private function doLevelConditions() {
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if ( $this->mCur->type === AFPToken::TKEYWORD && $this->mCur->value === 'if' ) {
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$position = $this->mPos;
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$this->move();
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$condition = $this->doLevelBoolOps();
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if ( !( $this->mCur->type === AFPToken::TKEYWORD && $this->mCur->value === 'then' ) ) {
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throw new UserVisibleException( 'expectednotfound',
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$this->mPos,
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[
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'then',
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$this->mCur->type,
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$this->mCur->value
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]
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);
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}
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$this->move();
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$valueIfTrue = $this->doLevelConditions();
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if ( $this->mCur->type === AFPToken::TKEYWORD && $this->mCur->value === 'else' ) {
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$this->move();
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$valueIfFalse = $this->doLevelConditions();
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} else {
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$valueIfFalse = null;
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}
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if ( !( $this->mCur->type === AFPToken::TKEYWORD && $this->mCur->value === 'end' ) ) {
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throw new UserVisibleException( 'expectednotfound',
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$this->mPos,
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[
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'end',
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$this->mCur->type,
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$this->mCur->value
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]
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);
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}
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$this->move();
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return new AFPTreeNode(
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AFPTreeNode::CONDITIONAL,
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[ $condition, $valueIfTrue, $valueIfFalse ],
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$position
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);
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}
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$condition = $this->doLevelBoolOps();
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if ( $this->mCur->type === AFPToken::TOP && $this->mCur->value === '?' ) {
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$position = $this->mPos;
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$this->move();
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$valueIfTrue = $this->doLevelConditions();
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if ( !( $this->mCur->type === AFPToken::TOP && $this->mCur->value === ':' ) ) {
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throw new UserVisibleException( 'expectednotfound',
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$this->mPos,
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[
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':',
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$this->mCur->type,
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$this->mCur->value
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]
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);
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}
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$this->move();
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$valueIfFalse = $this->doLevelConditions();
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return new AFPTreeNode(
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AFPTreeNode::CONDITIONAL,
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[ $condition, $valueIfTrue, $valueIfFalse ],
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$position
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);
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}
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return $condition;
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}
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/**
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* Handles logic operators.
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*
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* @return AFPTreeNode
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*/
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private function doLevelBoolOps() {
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$leftOperand = $this->doLevelCompares();
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$ops = [ '&', '|', '^' ];
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while ( $this->mCur->type === AFPToken::TOP && in_array( $this->mCur->value, $ops ) ) {
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$op = $this->mCur->value;
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$position = $this->mPos;
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$this->move();
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$rightOperand = $this->doLevelCompares();
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$leftOperand = new AFPTreeNode(
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AFPTreeNode::LOGIC,
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[ $op, $leftOperand, $rightOperand ],
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$position
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);
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}
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return $leftOperand;
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}
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/**
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* Handles comparison operators.
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*
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* @return AFPTreeNode
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*/
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private function doLevelCompares() {
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$leftOperand = $this->doLevelSumRels();
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$equalityOps = [ '==', '===', '!=', '!==', '=' ];
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$orderOps = [ '<', '>', '<=', '>=' ];
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// Only allow either a single operation, or a combination of a single equalityOps and a single
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// orderOps. This resembles what PHP does, and allows `a < b == c` while rejecting `a < b < c`
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$allowedOps = array_merge( $equalityOps, $orderOps );
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while ( $this->mCur->type === AFPToken::TOP && in_array( $this->mCur->value, $allowedOps ) ) {
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$op = $this->mCur->value;
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$allowedOps = in_array( $op, $equalityOps ) ?
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array_diff( $allowedOps, $equalityOps ) :
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array_diff( $allowedOps, $orderOps );
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$position = $this->mPos;
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$this->move();
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$rightOperand = $this->doLevelSumRels();
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$leftOperand = new AFPTreeNode(
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AFPTreeNode::COMPARE,
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[ $op, $leftOperand, $rightOperand ],
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$position
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);
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}
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return $leftOperand;
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}
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/**
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* Handle addition and subtraction.
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*
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* @return AFPTreeNode
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*/
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private function doLevelSumRels() {
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$leftOperand = $this->doLevelMulRels();
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$ops = [ '+', '-' ];
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while ( $this->mCur->type === AFPToken::TOP && in_array( $this->mCur->value, $ops ) ) {
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$op = $this->mCur->value;
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$position = $this->mPos;
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$this->move();
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$rightOperand = $this->doLevelMulRels();
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$leftOperand = new AFPTreeNode(
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AFPTreeNode::SUM_REL,
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[ $op, $leftOperand, $rightOperand ],
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$position
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);
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}
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return $leftOperand;
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}
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/**
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* Handles multiplication and division.
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*
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* @return AFPTreeNode
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*/
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private function doLevelMulRels() {
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$leftOperand = $this->doLevelPow();
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$ops = [ '*', '/', '%' ];
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while ( $this->mCur->type === AFPToken::TOP && in_array( $this->mCur->value, $ops ) ) {
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$op = $this->mCur->value;
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$position = $this->mPos;
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$this->move();
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$rightOperand = $this->doLevelPow();
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$leftOperand = new AFPTreeNode(
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AFPTreeNode::MUL_REL,
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[ $op, $leftOperand, $rightOperand ],
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$position
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);
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}
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return $leftOperand;
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}
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/**
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* Handles exponentiation.
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*
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* @return AFPTreeNode
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*/
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private function doLevelPow() {
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$base = $this->doLevelBoolInvert();
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while ( $this->mCur->type === AFPToken::TOP && $this->mCur->value === '**' ) {
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$position = $this->mPos;
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$this->move();
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$exponent = $this->doLevelBoolInvert();
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$base = new AFPTreeNode( AFPTreeNode::POW, [ $base, $exponent ], $position );
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}
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return $base;
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}
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/**
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* Handles boolean inversion.
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*
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* @return AFPTreeNode
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*/
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private function doLevelBoolInvert() {
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if ( $this->mCur->type === AFPToken::TOP && $this->mCur->value === '!' ) {
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$position = $this->mPos;
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$this->move();
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$argument = $this->doLevelKeywordOperators();
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return new AFPTreeNode( AFPTreeNode::BOOL_INVERT, [ $argument ], $position );
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}
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return $this->doLevelKeywordOperators();
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}
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/**
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* Handles keyword operators.
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*
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* @return AFPTreeNode
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*/
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private function doLevelKeywordOperators() {
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$leftOperand = $this->doLevelUnarys();
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$keyword = strtolower( $this->mCur->value );
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if ( $this->mCur->type === AFPToken::TKEYWORD &&
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isset( FilterEvaluator::KEYWORDS[$keyword] )
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) {
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$position = $this->mPos;
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$this->move();
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$rightOperand = $this->doLevelUnarys();
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return new AFPTreeNode(
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AFPTreeNode::KEYWORD_OPERATOR,
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[ $keyword, $leftOperand, $rightOperand ],
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$position
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);
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}
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return $leftOperand;
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}
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/**
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* Handles unary operators.
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*
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* @return AFPTreeNode
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*/
|
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private function doLevelUnarys() {
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$op = $this->mCur->value;
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if ( $this->mCur->type === AFPToken::TOP && ( $op === "+" || $op === "-" ) ) {
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$position = $this->mPos;
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$this->move();
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$argument = $this->doLevelArrayElements();
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return new AFPTreeNode( AFPTreeNode::UNARY, [ $op, $argument ], $position );
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}
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return $this->doLevelArrayElements();
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}
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/**
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* Handles accessing an array element by an offset.
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*
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* @return AFPTreeNode
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* @throws UserVisibleException
|
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*/
|
|
private function doLevelArrayElements() {
|
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$array = $this->doLevelParenthesis();
|
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while ( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === '[' ) {
|
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$position = $this->mPos;
|
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$index = $this->doLevelSemicolon();
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$array = new AFPTreeNode( AFPTreeNode::ARRAY_INDEX, [ $array, $index ], $position );
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if ( !( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === ']' ) ) {
|
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throw new UserVisibleException( 'expectednotfound', $this->mPos,
|
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[ ']', $this->mCur->type, $this->mCur->value ] );
|
|
}
|
|
$this->move();
|
|
}
|
|
|
|
return $array;
|
|
}
|
|
|
|
/**
|
|
* Handles parenthesis.
|
|
*
|
|
* @return AFPTreeNode
|
|
* @throws UserVisibleException
|
|
*/
|
|
private function doLevelParenthesis() {
|
|
if ( $this->mCur->type === AFPToken::TBRACE && $this->mCur->value === '(' ) {
|
|
$next = $this->getNextToken();
|
|
if ( $next->type === AFPToken::TBRACE && $next->value === ')' ) {
|
|
// Empty parentheses are never allowed
|
|
throw new UserVisibleException(
|
|
'unexpectedtoken',
|
|
$this->mPos,
|
|
[
|
|
$this->mCur->type,
|
|
$this->mCur->value
|
|
]
|
|
);
|
|
}
|
|
$result = $this->doLevelSemicolon();
|
|
|
|
if ( !( $this->mCur->type === AFPToken::TBRACE && $this->mCur->value === ')' ) ) {
|
|
throw new UserVisibleException(
|
|
'expectednotfound',
|
|
$this->mPos,
|
|
[ ')', $this->mCur->type, $this->mCur->value ]
|
|
);
|
|
}
|
|
$this->move();
|
|
|
|
return $result;
|
|
}
|
|
|
|
return $this->doLevelFunction();
|
|
}
|
|
|
|
/**
|
|
* Handles function calls.
|
|
*
|
|
* @return AFPTreeNode
|
|
* @throws UserVisibleException
|
|
*/
|
|
private function doLevelFunction() {
|
|
$next = $this->getNextToken();
|
|
if ( $this->mCur->type === AFPToken::TID &&
|
|
$next->type === AFPToken::TBRACE &&
|
|
$next->value === '('
|
|
) {
|
|
$func = $this->mCur->value;
|
|
$position = $this->mPos;
|
|
$this->move();
|
|
|
|
$args = [];
|
|
$next = $this->getNextToken();
|
|
if ( $next->type !== AFPToken::TBRACE || $next->value !== ')' ) {
|
|
do {
|
|
$thisArg = $this->doLevelSemicolon();
|
|
if ( $thisArg !== null ) {
|
|
$args[] = $thisArg;
|
|
} elseif ( !$this->functionIsVariadic( $func ) ) {
|
|
throw new UserVisibleException(
|
|
'unexpectedtoken',
|
|
$this->mPos,
|
|
[
|
|
$this->mCur->type,
|
|
$this->mCur->value
|
|
]
|
|
);
|
|
}
|
|
} while ( $this->mCur->type === AFPToken::TCOMMA );
|
|
} else {
|
|
$this->move();
|
|
}
|
|
|
|
if ( $this->mCur->type !== AFPToken::TBRACE || $this->mCur->value !== ')' ) {
|
|
throw new UserVisibleException( 'expectednotfound',
|
|
$this->mPos,
|
|
[
|
|
')',
|
|
$this->mCur->type,
|
|
$this->mCur->value
|
|
]
|
|
);
|
|
}
|
|
$this->move();
|
|
|
|
array_unshift( $args, $func );
|
|
return new AFPTreeNode( AFPTreeNode::FUNCTION_CALL, $args, $position );
|
|
}
|
|
|
|
return $this->doLevelAtom();
|
|
}
|
|
|
|
/**
|
|
* Handle literals.
|
|
* @return AFPTreeNode
|
|
* @throws UserVisibleException
|
|
*/
|
|
private function doLevelAtom() {
|
|
$tok = $this->mCur->value;
|
|
switch ( $this->mCur->type ) {
|
|
case AFPToken::TID:
|
|
$this->checkLogDeprecatedVar( strtolower( $tok ) );
|
|
// Fallthrough intended
|
|
case AFPToken::TSTRING:
|
|
case AFPToken::TFLOAT:
|
|
case AFPToken::TINT:
|
|
$result = new AFPTreeNode( AFPTreeNode::ATOM, $this->mCur, $this->mPos );
|
|
break;
|
|
case AFPToken::TKEYWORD:
|
|
if ( in_array( $tok, [ "true", "false", "null" ] ) ) {
|
|
$result = new AFPTreeNode( AFPTreeNode::ATOM, $this->mCur, $this->mPos );
|
|
break;
|
|
}
|
|
|
|
throw new UserVisibleException(
|
|
'unrecognisedkeyword',
|
|
$this->mPos,
|
|
[ $tok ]
|
|
);
|
|
/** @noinspection PhpMissingBreakStatementInspection */
|
|
case AFPToken::TSQUAREBRACKET:
|
|
if ( $this->mCur->value === '[' ) {
|
|
$array = [];
|
|
while ( true ) {
|
|
$this->move();
|
|
if ( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === ']' ) {
|
|
break;
|
|
}
|
|
|
|
$array[] = $this->doLevelSet();
|
|
|
|
if ( $this->mCur->type === AFPToken::TSQUAREBRACKET && $this->mCur->value === ']' ) {
|
|
break;
|
|
}
|
|
if ( $this->mCur->type !== AFPToken::TCOMMA ) {
|
|
throw new UserVisibleException(
|
|
'expectednotfound',
|
|
$this->mPos,
|
|
[ ', or ]', $this->mCur->type, $this->mCur->value ]
|
|
);
|
|
}
|
|
}
|
|
|
|
$result = new AFPTreeNode( AFPTreeNode::ARRAY_DEFINITION, $array, $this->mPos );
|
|
break;
|
|
}
|
|
|
|
// Fallthrough expected
|
|
default:
|
|
throw new UserVisibleException(
|
|
'unexpectedtoken',
|
|
$this->mPos,
|
|
[
|
|
$this->mCur->type,
|
|
$this->mCur->value
|
|
]
|
|
);
|
|
}
|
|
|
|
$this->move();
|
|
// @phan-suppress-next-next-line PhanPossiblyUndeclaredVariable
|
|
// @phan-suppress-next-line PhanTypeMismatchReturnNullable Until phan can understand the switch
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Given a variable name, check if the variable is deprecated. If it is, log the use.
|
|
* Do that here, and not every time the AST is eval'ed. This means less logging, but more
|
|
* performance.
|
|
* @param string $varname
|
|
*/
|
|
private function checkLogDeprecatedVar( $varname ) {
|
|
if ( $this->keywordsManager->isVarDeprecated( $varname ) ) {
|
|
$this->logger->debug( "Deprecated variable $varname used in filter {$this->mFilter}." );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param string $fname
|
|
* @return bool
|
|
*/
|
|
private function functionIsVariadic( string $fname ): bool {
|
|
if ( !array_key_exists( $fname, FilterEvaluator::FUNC_ARG_COUNT ) ) {
|
|
// @codeCoverageIgnoreStart
|
|
throw new InvalidArgumentException( "Function $fname is not valid" );
|
|
// @codeCoverageIgnoreEnd
|
|
}
|
|
return FilterEvaluator::FUNC_ARG_COUNT[$fname][1] === INF;
|
|
}
|
|
}
|