mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/SpamBlacklist
synced 2024-11-30 18:04:24 +00:00
423 lines
11 KiB
PHP
423 lines
11 KiB
PHP
<?php
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/**
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* Base class for different kinds of blacklists
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*/
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abstract class BaseBlacklist {
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/**
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* Array of blacklist sources
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*
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* @var array
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*/
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public $files = [];
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/**
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* Array containing regexes to test against
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*
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* @var bool|array
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*/
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protected $regexes = false;
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/**
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* Chance of receiving a warning when the filter is hit
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*
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* @var int
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*/
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public $warningChance = 100;
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/**
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* @var int
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*/
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public $warningTime = 600;
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/**
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* @var int
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*/
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public $expiryTime = 900;
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/**
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* Array containing blacklists that extend BaseBlacklist
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*
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* @var array
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*/
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private static $blacklistTypes = [
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'spam' => 'SpamBlacklist',
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'email' => 'EmailBlacklist',
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];
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/**
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* Array of blacklist instances
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*
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* @var array
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*/
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private static $instances = [];
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/**
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* Constructor
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*
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* @param array $settings
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*/
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function __construct( $settings = [] ) {
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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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* @param array $links
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* @param Title $title
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* @param bool $preventLog
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* @return mixed
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*/
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abstract public function filter( array $links, Title $title, $preventLog = false );
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/**
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* Adds a blacklist class to the registry
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*
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* @param $type string
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* @param $class string
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*/
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public static function addBlacklistType( $type, $class ) {
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self::$blacklistTypes[$type] = $class;
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}
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/**
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* Return the array of blacklist types currently defined
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*
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* @return array
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*/
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public static function getBlacklistTypes() {
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return self::$blacklistTypes;
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}
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/**
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* Returns an instance of the given blacklist
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*
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* @param $type string Code for the blacklist
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* @return BaseBlacklist
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* @throws Exception
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*/
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public static function getInstance( $type ) {
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if ( !isset( self::$blacklistTypes[$type] ) ) {
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throw new Exception( "Invalid blacklist type '$type' passed to " . __METHOD__ );
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}
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if ( !isset( self::$instances[$type] ) ) {
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global $wgBlacklistSettings;
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// Prevent notices
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if ( !isset( $wgBlacklistSettings[$type] ) ) {
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$wgBlacklistSettings[$type] = [];
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}
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$class = self::$blacklistTypes[$type];
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self::$instances[$type] = new $class( $wgBlacklistSettings[$type] );
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}
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return self::$instances[$type];
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}
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/**
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* Returns the code for the blacklist implementation
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*
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* @return string
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*/
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abstract protected function getBlacklistType();
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/**
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* Check if the given local page title is a spam regex source.
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*
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* @param Title $title
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* @return bool
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*/
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public static function isLocalSource( Title $title ) {
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global $wgDBname, $wgBlacklistSettings;
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if ( $title->getNamespace() == NS_MEDIAWIKI ) {
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$sources = [];
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foreach ( self::$blacklistTypes as $type => $class ) {
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$type = ucfirst( $type );
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$sources += [
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"$type-blacklist",
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"$type-whitelist"
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];
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}
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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 = wfExpandUrl( $title->getFullUrl( 'action=raw' ), PROTO_HTTP );
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$thisHttpRegex = '/^' . preg_quote( $thisHttp, '/' ) . '(?:&.*)?$/';
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$files = [];
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foreach ( self::$blacklistTypes as $type => $class ) {
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if ( isset( $wgBlacklistSettings[$type]['files'] ) ) {
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$files += $wgBlacklistSettings[$type]['files'];
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}
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}
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foreach ( $files as $fileName ) {
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$matches = [];
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if ( preg_match( '/^DB: (\w*) (.*)$/', $fileName, $matches ) ) {
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if ( $wgDBname == $matches[1] ) {
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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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* Returns the type of blacklist from the given title
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*
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* @todo building a regex for this is pretty overkill
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* @param Title $title
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* @return bool|string
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*/
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public static function getTypeFromTitle( Title $title ) {
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global $wgContLang;
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$types = array_map( [ $wgContLang, 'ucfirst' ], array_keys( self::$blacklistTypes ) );
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$regex = '/(' . implode( '|', $types ). ')-(?:blacklist|whitelist)/';
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if ( preg_match( $regex, $title->getDBkey(), $m ) ) {
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return strtolower( $m[1] );
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}
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return false;
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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 $this->regexes;
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}
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/**
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* Returns the local blacklist
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*
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* @return array Regular expressions
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*/
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public function getLocalBlacklists() {
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$that = $this;
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$type = $this->getBlacklistType();
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return ObjectCache::getMainWANInstance()->getWithSetCallback(
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wfMemcKey( 'spamblacklist', $type, 'blacklist-regex' ),
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$this->expiryTime,
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function () use ( $that, $type ) {
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return SpamRegexBatch::regexesFromMessage( "{$type}-blacklist", $that );
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}
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);
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}
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/**
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* Returns the (local) whitelist
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*
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* @return array Regular expressions
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*/
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public function getWhitelists() {
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$that = $this;
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$type = $this->getBlacklistType();
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return ObjectCache::getMainWANInstance()->getWithSetCallback(
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wfMemcKey( 'spamblacklist', $type, 'whitelist-regex' ),
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$this->expiryTime,
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function () use ( $that, $type ) {
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return SpamRegexBatch::regexesFromMessage( "{$type}-whitelist", $that );
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}
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);
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}
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/**
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* Fetch (possibly cached) remote blacklists.
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* @return array
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*/
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function getSharedBlacklists() {
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$listType = $this->getBlacklistType();
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wfDebugLog( 'SpamBlacklist', "Loading $listType regex..." );
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if ( count( $this->files ) == 0 ) {
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# No lists
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wfDebugLog( 'SpamBlacklist', "no files specified\n" );
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return [];
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}
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$miss = false;
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$that = $this;
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$regexes = ObjectCache::getMainWANInstance()->getWithSetCallback(
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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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wfMemcKey( 'spamblacklist', $listType, 'shared-blacklist-regex' ),
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$this->expiryTime,
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function () use ( $that, &$miss ) {
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$miss = true;
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return $that->buildSharedBlacklists();
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}
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);
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if ( !$miss ) {
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wfDebugLog( 'SpamBlacklist', "Got shared spam regexes from cache\n" );
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}
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return $regexes;
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}
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/**
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* Clear all primary blacklist cache keys
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*
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* @note: this method is unused atm
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*/
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function clearCache() {
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$listType = $this->getBlacklistType();
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$cache = ObjectCache::getMainWANInstance();
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$cache->delete( wfMemcKey( 'spamblacklist', $listType, 'shared-blacklist-regex' ) );
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$cache->delete( wfMemcKey( 'spamblacklist', $listType, 'blacklist-regex' ) );
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$cache->delete( wfMemcKey( 'spamblacklist', $listType, 'whitelist-regex' ) );
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wfDebugLog( 'SpamBlacklist', "$listType blacklist local cache cleared.\n" );
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}
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function buildSharedBlacklists() {
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$regexes = [];
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$listType = $this->getBlacklistType();
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# Load lists
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wfDebugLog( 'SpamBlacklist', "Constructing $listType blacklist\n" );
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foreach ( $this->files as $fileName ) {
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$matches = [];
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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( '/^(https?:)?\/\//', $fileName ) ) {
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$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, $this, $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, $messageMemc;
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$listType = $this->getBlacklistType();
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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 $wgMemc except almost certain to exist. By default, it is stored
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# in the database
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# There are two keys, when the warning key expires, a random thread will refresh
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# the real key. This reduces the chance of multiple requests under high traffic
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# conditions.
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$key = "{$listType}_blacklist_file:$fileName";
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$warningKey = "$wgDBname:{$listType}filewarning:$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 $listType 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 $listType 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 $listType 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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/**
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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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*
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* @param string $wiki
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* @param string $article
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* @return string
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*/
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function getArticleText( $wiki, $article ) {
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wfDebugLog( 'SpamBlacklist',
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"Fetching {$this->getBlacklistType()} blacklist from '$article' on '$wiki'...\n" );
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$title = Title::newFromText( $article );
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// Load all the relevant tables from the correct DB.
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// This assumes that old_text is the actual text or
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// that the external store system is at least unified.
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$row = wfGetDB( DB_SLAVE, [], $wiki )->selectRow(
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[ 'page', 'revision', 'text' ],
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array_merge(
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Revision::selectFields(),
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Revision::selectPageFields(),
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Revision::selectTextFields()
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),
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[
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'page_namespace' => $title->getNamespace(), // assume NS IDs match
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'page_title' => $title->getDBkey(), // assume same case rules
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'rev_id=page_latest',
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'old_id=rev_text_id'
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],
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__METHOD__
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);
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return $row
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? ContentHandler::getContentText( Revision::newFromRow( $row )->getContent() )
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: false;
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}
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/**
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* Returns the start of the regex for matches
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*
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* @return string
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*/
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public function getRegexStart() {
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return '/[a-z0-9_\-.]*';
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}
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/**
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* Returns the end of the regex for matches
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*
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* @param $batchSize
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* @return string
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*/
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public function getRegexEnd( $batchSize ) {
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return ( $batchSize > 0 ) ? '/Sim' : '/im';
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}
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/**
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* @param Title $title
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* @param string[] $entries
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*/
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public function warmCachesForFilter( Title $title, array $entries ) {
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// subclass this
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}
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}
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