mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/SpamBlacklist
synced 2024-11-24 07:04:04 +00:00
542 lines
16 KiB
PHP
542 lines
16 KiB
PHP
<?php
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if ( !defined( 'MEDIAWIKI' ) ) {
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exit;
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}
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class SpamBlacklist {
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var $regexes = false;
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var $previousFilter = false;
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var $files = array( "http://meta.wikimedia.org/w/index.php?title=Spam_blacklist&action=raw&sb_ver=1" );
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var $warningTime = 600;
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var $expiryTime = 900;
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var $warningChance = 100;
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var $ignoreEditSummary = false;
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function SpamBlacklist( $settings = array() ) {
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foreach ( $settings as $name => $value ) {
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$this->$name = $value;
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}
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}
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/**
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* Check if the given local page title is a spam regex source.
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* @param Title $title
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* @return bool
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*/
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function isLocalSource( $title ) {
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global $wgDBname;
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if( $title->getNamespace() == NS_MEDIAWIKI ) {
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$sources = array(
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"Spam-blacklist",
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"Spam-whitelist" );
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if( in_array( $title->getDBkey(), $sources ) ) {
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return true;
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}
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}
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$thisHttp = $title->getFullUrl( 'action=raw' );
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$thisHttpRegex = '/^' . preg_quote( $thisHttp, '/' ) . '(?:&.*)?$/';
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foreach( $this->files as $fileName ) {
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if ( preg_match( '/^DB: (\w*) (.*)$/', $fileName, $matches ) ) {
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if ( $wgDBname == $matches[1] ) {
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$sources[] = $matches[2];
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if( $matches[2] == $title->getPrefixedDbKey() ) {
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// Local DB fetch of this page...
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return true;
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}
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}
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} elseif( preg_match( $thisHttpRegex, $fileName ) ) {
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// Raw view of this page
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return true;
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}
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}
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return false;
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}
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/**
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* @deprecated back-compat
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*/
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function getRegexes() {
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return $this->getBlacklists();
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}
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/**
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* Fetch local and (possibly cached) remote blacklists.
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* Will be cached locally across multiple invocations.
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* @return array set of regular expressions, potentially empty.
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*/
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function getBlacklists() {
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if( $this->regexes === false ) {
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$this->regexes = array_merge(
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$this->getLocalBlacklists(),
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$this->getSharedBlacklists() );
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}
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return $this->regexes;
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}
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/**
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* Fetch (possibly cached) remote blacklists.
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* @return array
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*/
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function getSharedBlacklists() {
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global $wgMemc, $wgDBname;
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$fname = 'SpamBlacklist::getRegex';
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wfProfileIn( $fname );
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wfDebugLog( 'SpamBlacklist', "Loading spam regex..." );
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if ( count( $this->files ) == 0 ){
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# No lists
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wfDebugLog( 'SpamBlacklist', "no files specified\n" );
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wfProfileOut( $fname );
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return array();
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}
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// This used to be cached per-site, but that could be bad on a shared
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// server where not all wikis have the same configuration.
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$cachedRegexes = $wgMemc->get( "$wgDBname:spam_blacklist_regexes" );
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if( is_array( $cachedRegexes ) ) {
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wfDebugLog( 'SpamBlacklist', "Got shared spam regexes from cache\n" );
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wfProfileOut( $fname );
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return $cachedRegexes;
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}
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$regexes = $this->buildSharedBlacklists();
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$wgMemc->set( "$wgDBname:spam_blacklist_regexes", $regexes, $this->expiryTime );
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return $regexes;
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}
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function clearCache() {
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global $wgMemc, $wgDBname;
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$wgMemc->delete( "$wgDBname:spam_blacklist_regexes" );
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wfDebugLog( 'SpamBlacklist', "Spam blacklist local cache cleared.\n" );
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}
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function buildSharedBlacklists() {
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$regexes = array();
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# Load lists
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wfDebugLog( 'SpamBlacklist', "Constructing spam blacklist\n" );
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foreach ( $this->files as $fileName ) {
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if ( preg_match( '/^DB: ([\w-]*) (.*)$/', $fileName, $matches ) ) {
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$text = $this->getArticleText( $matches[1], $matches[2] );
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} elseif ( preg_match( '/^http:\/\//', $fileName ) ) {
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$text = $this->getHttpText( $fileName );
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} else {
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$text = file_get_contents( $fileName );
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wfDebugLog( 'SpamBlacklist', "got from file $fileName\n" );
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}
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// Build a separate batch of regexes from each source.
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// While in theory we could squeeze a little efficiency
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// out of combining multiple sources in one regex, if
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// there's a bad line in one of them we'll gain more
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// from only having to break that set into smaller pieces.
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$regexes = array_merge( $regexes,
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SpamRegexBatch::regexesFromText( $text, $fileName ) );
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}
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return $regexes;
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}
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function getHttpText( $fileName ) {
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global $wgDBname, $messageMemc;
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# HTTP request
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# To keep requests to a minimum, we save results into $messageMemc, which is
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# similar to $wgMemc except almost certain to exist. By default, it is stored
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# in the database
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#
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# There are two keys, when the warning key expires, a random thread will refresh
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# the real key. This reduces the chance of multiple requests under high traffic
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# conditions.
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$key = "spam_blacklist_file:$fileName";
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$warningKey = "$wgDBname:spamfilewarning:$fileName";
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$httpText = $messageMemc->get( $key );
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$warning = $messageMemc->get( $warningKey );
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if ( !is_string( $httpText ) || ( !$warning && !mt_rand( 0, $this->warningChance ) ) ) {
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wfDebugLog( 'SpamBlacklist', "Loading spam blacklist from $fileName\n" );
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$httpText = Http::get( $fileName );
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if( $httpText === false ) {
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wfDebugLog( 'SpamBlacklist', "Error loading blacklist from $fileName\n" );
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}
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$messageMemc->set( $warningKey, 1, $this->warningTime );
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$messageMemc->set( $key, $httpText, $this->expiryTime );
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} else {
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wfDebugLog( 'SpamBlacklist', "Got spam blacklist from HTTP cache for $fileName\n" );
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}
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return $httpText;
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}
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static function getLocalBlacklists() {
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return SpamRegexBatch::regexesFromMessage( 'spam-blacklist' );
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}
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static function getWhitelists() {
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return SpamRegexBatch::regexesFromMessage( 'spam-whitelist' );
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}
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/**
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* @param Title $title
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* @param string $text Text of section, or entire text if $editPage!=false
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* @param string $section Section number or name
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* @param EditSummary $editSummary Edit summary if one exists, some people use urls there too
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* @param EditPage $editPage EditPage if EditFilterMerged was called, null otherwise
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* @return Matched text if the edit should not be allowed, false otherwise
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*/
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function filter( &$title, $text, $section, $editsummary = '', EditPage &$editPage = null ) {
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global $wgVersion, $wgOut, $wgParser, $wgUser;
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$fname = 'wfSpamBlacklistFilter';
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wfProfileIn( $fname );
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# Call the rest of the hook chain first
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if ( $this->previousFilter ) {
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$f = $this->previousFilter;
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if ( $f( $title, $text, $section ) ) {
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wfProfileOut( $fname );
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return true;
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}
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}
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$this->title = $title;
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$this->text = $text;
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$this->section = $section;
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$text = str_replace( '．', '.', $text ); //@bug 12896
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$blacklists = $this->getBlacklists();
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$whitelists = $this->getWhitelists();
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if ( count( $blacklists ) ) {
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# Run parser to strip SGML comments and such out of the markup
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# This was being used to circumvent the filter (see bug 5185)
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if ( $editPage ) {
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$editInfo = $editPage->mArticle->prepareTextForEdit( $text );
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$out = $editInfo->output;
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} else {
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$options = new ParserOptions();
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$text = $wgParser->preSaveTransform( $text, $title, $wgUser, $options );
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$out = $wgParser->parse( $text, $title, $options );
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}
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$newLinks = array_keys( $out->getExternalLinks() );
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$oldLinks = $this->getCurrentLinks( $title );
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$addedLinks = array_diff( $newLinks, $oldLinks );
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// We add the edit summary if one exists
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if ( !$this->ignoreEditSummary && !empty( $editsummary ) ) $addedLinks[] = $editsummary;
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wfDebugLog( 'SpamBlacklist', "Old URLs: " . implode( ', ', $oldLinks ) );
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wfDebugLog( 'SpamBlacklist', "New URLs: " . implode( ', ', $newLinks ) );
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wfDebugLog( 'SpamBlacklist', "Added URLs: " . implode( ', ', $addedLinks ) );
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$links = implode( "\n", $addedLinks );
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# Strip whitelisted URLs from the match
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if( is_array( $whitelists ) ) {
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wfDebugLog( 'SpamBlacklist', "Excluding whitelisted URLs from " . count( $whitelists ) .
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" regexes: " . implode( ', ', $whitelists ) . "\n" );
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foreach( $whitelists as $regex ) {
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wfSuppressWarnings();
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$newLinks = preg_replace( $regex, '', $links );
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wfRestoreWarnings();
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if( is_string( $newLinks ) ) {
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// If there wasn't a regex error, strip the matching URLs
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$links = $newLinks;
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}
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}
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}
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# Do the match
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wfDebugLog( 'SpamBlacklist', "Checking text against " . count( $blacklists ) .
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" regexes: " . implode( ', ', $blacklists ) . "\n" );
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$retVal = false;
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foreach( $blacklists as $regex ) {
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wfSuppressWarnings();
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$check = preg_match( $regex, $links, $matches );
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wfRestoreWarnings();
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if( $check ) {
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wfDebugLog( 'SpamBlacklist', "Match!\n" );
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$ip = wfGetIP();
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wfDebugLog( 'SpamBlacklistHit', "$ip caught submitting spam: {$matches[0]}\n" );
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$retVal = $matches[0];
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break;
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}
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}
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} else {
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$retVal = false;
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}
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wfProfileOut( $fname );
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return $retVal;
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}
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/**
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* Look up the links currently in the article, so we can
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* ignore them on a second run.
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*
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* WARNING: I can add more *of the same link* with no problem here.
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*/
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function getCurrentLinks( $title ) {
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$dbr = wfGetDB( DB_SLAVE );
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$id = $title->getArticleId(); // should be zero queries
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$res = $dbr->select( 'externallinks', array( 'el_to' ),
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array( 'el_from' => $id ), __METHOD__ );
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$links = array();
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while ( $row = $dbr->fetchObject( $res ) ) {
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$links[] = $row->el_to;
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}
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return $links;
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}
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/**
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* Fetch an article from this or another local MediaWiki database.
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* This is probably *very* fragile, and shouldn't be used perhaps.
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* @param string $db
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* @param string $article
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*/
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function getArticleText( $db, $article ) {
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wfDebugLog( 'SpamBlacklist', "Fetching local spam blacklist from '$article' on '$db'...\n" );
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global $wgDBname;
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$dbr = wfGetDB( DB_READ );
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$dbr->selectDB( $db );
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$text = false;
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if ( $dbr->tableExists( 'page' ) ) {
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// 1.5 schema
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$dbw = wfGetDB( DB_READ );
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$dbw->selectDB( $db );
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$revision = Revision::newFromTitle( Title::newFromText( $article ) );
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if ( $revision ) {
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$text = $revision->getText();
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}
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$dbw->selectDB( $wgDBname );
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} else {
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// 1.4 schema
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$title = Title::newFromText( $article );
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$text = $dbr->selectField( 'cur', 'cur_text', array( 'cur_namespace' => $title->getNamespace(),
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'cur_title' => $title->getDBkey() ), 'SpamBlacklist::getArticleText' );
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}
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$dbr->selectDB( $wgDBname );
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return strval( $text );
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}
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/**
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* Confirm that a local blacklist page being saved is valid,
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* and toss back a warning to the user if it isn't.
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* This is an EditFilter hook.
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*/
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function validate( $editPage, $text, $section, &$hookError ) {
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$thisPageName = $editPage->mTitle->getPrefixedDBkey();
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if( !$this->isLocalSource( $editPage->mTitle ) ) {
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wfDebugLog( 'SpamBlacklist', "Spam blacklist validator: [[$thisPageName]] not a local blacklist\n" );
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return true;
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}
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$lines = explode( "\n", $text );
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$badLines = SpamRegexBatch::getBadLines( $lines );
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if( $badLines ) {
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wfDebugLog( 'SpamBlacklist', "Spam blacklist validator: [[$thisPageName]] given invalid input lines: " .
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implode( ', ', $badLines ) . "\n" );
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$badList = "*<tt>" .
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implode( "</tt>\n*<tt>",
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array_map( 'wfEscapeWikiText', $badLines ) ) .
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"</tt>\n";
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$hookError =
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"<div class='errorbox'>" .
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wfMsgExt( 'spam-invalid-lines', array( 'parsemag' ), count( $badLines ) ) . "<br />" .
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$badList .
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"</div>\n" .
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"<br clear='all' />\n";
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return true;
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} else {
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wfDebugLog( 'SpamBlacklist', "Spam blacklist validator: [[$thisPageName]] ok or empty blacklist\n" );
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return true;
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}
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}
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function onArticleSave( &$article, &$user, $text, $summary, $isminor, $iswatch, $section ) {
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if( $this->isLocalSource( $article->getTitle() ) ) {
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$this->clearCache();
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}
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return true;
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}
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}
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class SpamRegexBatch {
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/**
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* Build a set of regular expressions matching URLs with the list of regex fragments.
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* Returns an empty list if the input list is empty.
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*
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* @param array $lines list of fragments which will match in URLs
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* @param int $batchSize largest allowed batch regex;
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* if 0, will produce one regex per line
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* @return array
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* @private
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* @static
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*/
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static function buildRegexes( $lines, $batchSize=4096 ) {
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# Make regex
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# It's faster using the S modifier even though it will usually only be run once
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//$regex = 'https?://+[a-z0-9_\-.]*(' . implode( '|', $lines ) . ')';
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//return '/' . str_replace( '/', '\/', preg_replace('|\\\*/|', '/', $regex) ) . '/Sim';
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$regexes = array();
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$regexStart = '/https?:\/\/+[a-z0-9_\-.]*(';
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$regexEnd = ($batchSize > 0 ) ? ')/Sim' : ')/im';
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$build = false;
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foreach( $lines as $line ) {
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if( substr( $line, -1, 1 ) == "\\" ) {
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// Final \ will break silently on the batched regexes.
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// Skip it here to avoid breaking the next line;
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// warnings from getBadLines() will still trigger on
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// edit to keep new ones from floating in.
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continue;
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}
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// FIXME: not very robust size check, but should work. :)
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if( $build === false ) {
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$build = $line;
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} elseif( strlen( $build ) + strlen( $line ) > $batchSize ) {
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$regexes[] = $regexStart .
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str_replace( '/', '\/', preg_replace('|\\\*/|', '/', $build) ) .
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$regexEnd;
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$build = $line;
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} else {
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$build .= '|';
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$build .= $line;
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}
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}
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if( $build !== false ) {
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$regexes[] = $regexStart .
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str_replace( '/', '\/', preg_replace('|\\\*/|', '/', $build) ) .
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$regexEnd;
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}
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return $regexes;
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}
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/**
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* Confirm that a set of regexes is either empty or valid.
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* @param array $lines set of regexes
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* @return bool true if ok, false if contains invalid lines
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* @private
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* @static
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*/
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static function validateRegexes( $regexes ) {
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foreach( $regexes as $regex ) {
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wfSuppressWarnings();
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$ok = preg_match( $regex, '' );
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wfRestoreWarnings();
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if( $ok === false ) {
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return false;
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}
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}
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return true;
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}
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/**
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* Strip comments and whitespace, then remove blanks
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* @private
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* @static
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*/
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static function stripLines( $lines ) {
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return array_filter(
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array_map( 'trim',
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preg_replace( '/#.*$/', '',
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$lines ) ) );
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}
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/**
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* Do a sanity check on the batch regex.
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* @param lines unsanitized input lines
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* @param string $fileName optional for debug reporting
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* @return array of regexes
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* @private
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* @static
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*/
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static function buildSafeRegexes( $lines, $fileName=false ) {
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$lines = SpamRegexBatch::stripLines( $lines );
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$regexes = SpamRegexBatch::buildRegexes( $lines );
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if( SpamRegexBatch::validateRegexes( $regexes ) ) {
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return $regexes;
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} else {
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// _Something_ broke... rebuild line-by-line; it'll be
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// slower if there's a lot of blacklist lines, but one
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// broken line won't take out hundreds of its brothers.
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if( $fileName ) {
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wfDebugLog( 'SpamBlacklist', "Spam blacklist warning: bogus line in $fileName\n" );
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}
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return SpamRegexBatch::buildRegexes( $lines, 0 );
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}
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}
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/**
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* @param array $lines
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* @return array of input lines which produce invalid input, or empty array if no problems
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* @static
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*/
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static function getBadLines( $lines ) {
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$lines = SpamRegexBatch::stripLines( $lines );
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$badLines = array();
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foreach( $lines as $line ) {
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if( substr( $line, -1, 1 ) == "\\" ) {
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||
// Final \ will break silently on the batched regexes.
|
||
$badLines[] = $line;
|
||
}
|
||
}
|
||
|
||
$regexes = SpamRegexBatch::buildRegexes( $lines );
|
||
if( SpamRegexBatch::validateRegexes( $regexes ) ) {
|
||
// No other problems!
|
||
return $badLines;
|
||
}
|
||
|
||
// Something failed in the batch, so check them one by one.
|
||
foreach( $lines as $line ) {
|
||
$regexes = SpamRegexBatch::buildRegexes( array( $line ) );
|
||
if( !SpamRegexBatch::validateRegexes( $regexes ) ) {
|
||
$badLines[] = $line;
|
||
}
|
||
}
|
||
return $badLines;
|
||
}
|
||
|
||
/**
|
||
* Build a set of regular expressions from the given multiline input text,
|
||
* with empty lines and comments stripped.
|
||
*
|
||
* @param string $source
|
||
* @param string $fileName optional, for reporting of bad files
|
||
* @return array of regular expressions, potentially empty
|
||
* @static
|
||
*/
|
||
static function regexesFromText( $source, $fileName=false ) {
|
||
$lines = explode( "\n", $source );
|
||
return SpamRegexBatch::buildSafeRegexes( $lines, $fileName );
|
||
}
|
||
|
||
/**
|
||
* Build a set of regular expressions from a MediaWiki message.
|
||
* Will be correctly empty if the message isn't present.
|
||
* @param string $source
|
||
* @return array of regular expressions, potentially empty
|
||
* @static
|
||
*/
|
||
static function regexesFromMessage( $message ) {
|
||
$source = wfMsgForContent( $message );
|
||
if( $source && !wfEmptyMsg( $message, $source ) ) {
|
||
return SpamRegexBatch::regexesFromText( $source );
|
||
} else {
|
||
return array();
|
||
}
|
||
}
|
||
}
|
||
|