wikimedia/mediawiki-extensions-AbuseFilter
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mediawiki-extensions-AbuseF.../AbuseFilter.class.php
Aaron Schulz 4daa66c68c Lower stash logging to debug() 
Bug: T146697
Change-Id: I480b491d788e2ce970238c103b2ff05167312513
2016-09-26 22:21:37 +00:00

2522 lines
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PHP
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<?php
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\MediaWikiServices;
/**
* This class contains most of the business logic of AbuseFilter. It consists of mostly
* static functions that handle activities such as parsing edits, applying filters,
* logging actions, etc.
*/
class AbuseFilter {
public static $statsStoragePeriod = 86400;
public static $condLimitEnabled = true;
/** @var array Map of (filter ID => stdClass) */
private static $filterCache = [];
public static $condCount = 0;
public static $tagsToSet = array(); // FIXME: avoid global state here
public static $history_mappings = array(
'af_pattern' => 'afh_pattern',
'af_user' => 'afh_user',
'af_user_text' => 'afh_user_text',
'af_timestamp' => 'afh_timestamp',
'af_comments' => 'afh_comments',
'af_public_comments' => 'afh_public_comments',
'af_deleted' => 'afh_deleted',
'af_id' => 'afh_filter',
'af_group' => 'afh_group',
);
public static $builderValues = array(
'op-arithmetic' => array(
'+' => 'addition',
'-' => 'subtraction',
'*' => 'multiplication',
'/' => 'divide',
'%' => 'modulo',
'**' => 'pow'
),
'op-comparison' => array(
'==' => 'equal',
'!=' => 'notequal',
'<' => 'lt',
'>' => 'gt',
'<=' => 'lte',
'>=' => 'gte'
),
'op-bool' => array(
'!' => 'not',
'&' => 'and',
'|' => 'or',
'^' => 'xor'
),
'misc' => array(
'in' => 'in',
'contains' => 'contains',
'like' => 'like',
'""' => 'stringlit',
'rlike' => 'rlike',
'irlike' => 'irlike',
'cond ? iftrue : iffalse' => 'tern',
'if cond then iftrue elseiffalse end' => 'cond',
),
'funcs' => array(
'length(string)' => 'length',
'lcase(string)' => 'lcase',
'ucase(string)' => 'ucase',
'ccnorm(string)' => 'ccnorm',
'rmdoubles(string)' => 'rmdoubles',
'specialratio(string)' => 'specialratio',
'norm(string)' => 'norm',
'count(needle,haystack)' => 'count',
'rcount(needle,haystack)' => 'rcount',
'rmwhitespace(text)' => 'rmwhitespace',
'rmspecials(text)' => 'rmspecials',
'ip_in_range(ip, range)' => 'ip_in_range',
'contains_any(haystack,needle1,needle2,needle3)' => 'contains-any',
'substr(subject, offset, length)' => 'substr',
'strpos(haystack, needle)' => 'strpos',
'str_replace(subject, search, replace)' => 'str_replace',
'rescape(string)' => 'rescape',
'set_var(var,value)' => 'set_var',
),
'vars' => array(
'timestamp' => 'timestamp',
'accountname' => 'accountname',
'action' => 'action',
'added_lines' => 'addedlines',
'edit_delta' => 'delta',
'edit_diff' => 'diff',
'new_size' => 'newsize',
'old_size' => 'oldsize',
'new_content_model' => 'new-content-model',
'old_content_model' => 'old-content-model',
'removed_lines' => 'removedlines',
'summary' => 'summary',
'article_articleid' => 'article-id',
'article_namespace' => 'article-ns',
'article_text' => 'article-text',
'article_prefixedtext' => 'article-prefixedtext',
// 'article_views' => 'article-views', # May not be enabled, defined in getBuilderValues()
'moved_from_articleid' => 'movedfrom-id',
'moved_from_namespace' => 'movedfrom-ns',
'moved_from_text' => 'movedfrom-text',
'moved_from_prefixedtext' => 'movedfrom-prefixedtext',
'moved_to_articleid' => 'movedto-id',
'moved_to_namespace' => 'movedto-ns',
'moved_to_text' => 'movedto-text',
'moved_to_prefixedtext' => 'movedto-prefixedtext',
'user_editcount' => 'user-editcount',
'user_age' => 'user-age',
'user_name' => 'user-name',
'user_groups' => 'user-groups',
'user_rights' => 'user-rights',
'user_blocked' => 'user-blocked',
'user_emailconfirm' => 'user-emailconfirm',
'old_wikitext' => 'old-text',
'new_wikitext' => 'new-text',
'added_links' => 'added-links',
'removed_links' => 'removed-links',
'all_links' => 'all-links',
'new_pst' => 'new-pst',
'edit_diff_pst' => 'diff-pst',
'added_lines_pst' => 'addedlines-pst',
'new_text' => 'new-text-stripped',
'new_html' => 'new-html',
'article_restrictions_edit' => 'restrictions-edit',
'article_restrictions_move' => 'restrictions-move',
'article_restrictions_create' => 'restrictions-create',
'article_restrictions_upload' => 'restrictions-upload',
'article_recent_contributors' => 'recent-contributors',
'article_first_contributor' => 'first-contributor',
// 'old_text' => 'old-text-stripped', # Disabled, performance
// 'old_html' => 'old-html', # Disabled, performance
'old_links' => 'old-links',
'minor_edit' => 'minor-edit',
'file_sha1' => 'file-sha1',
'file_size' => 'file-size',
'file_mime' => 'file-mime',
'file_mediatype' => 'file-mediatype',
'file_width' => 'file-width',
'file_height' => 'file-height',
'file_bits_per_channel' => 'file-bits-per-channel',
),
);
public static $editboxName = null;
/**
* @param $context IContextSource
* @param $pageType
*/
public static function addNavigationLinks( IContextSource $context, $pageType ) {
$linkDefs = array(
'home' => 'Special:AbuseFilter',
'recentchanges' => 'Special:AbuseFilter/history',
'examine' => 'Special:AbuseFilter/examine',
'log' => 'Special:AbuseLog',
);
if ( $context->getUser()->isAllowed( 'abusefilter-modify' ) ) {
$linkDefs = array_merge( $linkDefs, array(
'test' => 'Special:AbuseFilter/test',
'tools' => 'Special:AbuseFilter/tools',
'import' => 'Special:AbuseFilter/import',
) );
}
// Save some translator work
$msgOverrides = array(
'recentchanges' => 'abusefilter-filter-log',
);
$links = array();
foreach ( $linkDefs as $name => $page ) {
// Give grep a chance to find the usages:
// abusefilter-topnav-home, abusefilter-topnav-test, abusefilter-topnav-examine
// abusefilter-topnav-log, abusefilter-topnav-tools, abusefilter-topnav-import
$msgName = "abusefilter-topnav-$name";
if ( isset( $msgOverrides[$name] ) ) {
$msgName = $msgOverrides[$name];
}
$msg = $context->msg( $msgName )->parse();
$title = Title::newFromText( $page );
if ( $name == $pageType ) {
$links[] = Xml::tags( 'strong', null, $msg );
} else {
$links[] = Linker::link( $title, $msg );
}
}
$linkStr = $context->msg( 'parentheses', $context->getLanguage()->pipeList( $links ) )->text();
$linkStr = $context->msg( 'abusefilter-topnav' )->parse() . " $linkStr";
$linkStr = Xml::tags( 'div', array( 'class' => 'mw-abusefilter-navigation' ), $linkStr );
$context->getOutput()->setSubtitle( $linkStr );
}
/**
* @static
* @param $user User
* @return AbuseFilterVariableHolder
*/
public static function generateUserVars( $user ) {
$vars = new AbuseFilterVariableHolder;
$vars->setLazyLoadVar(
'user_editcount',
'simple-user-accessor',
array( 'user' => $user, 'method' => 'getEditCount' )
);
$vars->setVar( 'user_name', $user->getName() );
$vars->setLazyLoadVar(
'user_emailconfirm',
'simple-user-accessor',
array( 'user' => $user, 'method' => 'getEmailAuthenticationTimestamp' )
);
$vars->setLazyLoadVar(
'user_age',
'user-age',
array( 'user' => $user, 'asof' => wfTimestampNow() )
);
$vars->setLazyLoadVar(
'user_groups',
'simple-user-accessor',
array( 'user' => $user, 'method' => 'getEffectiveGroups' )
);
$vars->setLazyLoadVar(
'user_rights',
'simple-user-accessor',
array( 'user' => $user, 'method' => 'getRights' )
);
$vars->setLazyLoadVar(
'user_blocked',
'simple-user-accessor',
array( 'user' => $user, 'method' => 'isBlocked' )
);
Hooks::run( 'AbuseFilter-generateUserVars', array( $vars, $user ) );
return $vars;
}
/**
* @return array
*/
public static function getBuilderValues() {
static $realValues = null;
if ( $realValues ) {
return $realValues;
}
$realValues = self::$builderValues;
global $wgDisableCounters;
if ( !$wgDisableCounters ) {
$realValues['vars']['article_views'] = 'article-views';
}
Hooks::run( 'AbuseFilter-builder', array( &$realValues ) );
return $realValues;
}
/**
* @param $filter
* @return bool
*/
public static function filterHidden( $filter ) {
$globalIndex = self::decodeGlobalName( $filter );
if ( $globalIndex ) {
global $wgAbuseFilterCentralDB;
if ( !$wgAbuseFilterCentralDB ) {
return false;
}
$dbr = wfGetDB( DB_SLAVE, array(), $wgAbuseFilterCentralDB );
$filter = $globalIndex;
} else {
$dbr = wfGetDB( DB_SLAVE );
}
if ( $filter === 'new' ) {
return false;
};
$hidden = $dbr->selectField(
'abuse_filter',
'af_hidden',
array( 'af_id' => $filter ),
__METHOD__
);
return (bool)$hidden;
}
/**
* @param $val int
* @throws MWException
*/
public static function triggerLimiter( $val = 1 ) {
self::$condCount += $val;
global $wgAbuseFilterConditionLimit;
if ( self::$condLimitEnabled && self::$condCount > $wgAbuseFilterConditionLimit ) {
throw new MWException( 'Condition limit reached.' );
}
}
public static function disableConditionLimit() {
// For use in batch scripts and the like
self::$condLimitEnabled = false;
}
/**
* @param $title Title
* @param $prefix
* @return AbuseFilterVariableHolder
*/
public static function generateTitleVars( $title, $prefix ) {
$vars = new AbuseFilterVariableHolder;
if ( !$title ) {
return $vars;
}
$vars->setVar( $prefix . '_ARTICLEID', $title->getArticleID() );
$vars->setVar( $prefix . '_NAMESPACE', $title->getNamespace() );
$vars->setVar( $prefix . '_TEXT', $title->getText() );
$vars->setVar( $prefix . '_PREFIXEDTEXT', $title->getPrefixedText() );
global $wgDisableCounters;
if ( !$wgDisableCounters && !$title->isSpecialPage() ) {
// Support: MediaWiki 1.24 and earlier
if ( method_exists( 'WikiPage', 'getCount' ) ) {
$vars->setVar( $prefix . '_VIEWS', WikiPage::factory( $title )->getCount() );
// Support: MediaWiki 1.25+ with HitCounters extension
} elseif ( method_exists( 'HitCounters\HitCounters', 'getCount' ) ) {
$vars->setVar( $prefix . '_VIEWS', HitCounters\HitCounters::getCount( $title ) );
}
}
// Use restrictions.
global $wgRestrictionTypes;
foreach ( $wgRestrictionTypes as $action ) {
$vars->setLazyLoadVar( "{$prefix}_restrictions_$action", 'get-page-restrictions',
array( 'title' => $title->getText(),
'namespace' => $title->getNamespace(),
'action' => $action
)
);
}
$vars->setLazyLoadVar( "{$prefix}_recent_contributors", 'load-recent-authors',
array(
'title' => $title->getText(),
'namespace' => $title->getNamespace()
) );
$vars->setLazyLoadVar( "{$prefix}_first_contributor", 'load-first-author',
array(
'title' => $title->getText(),
'namespace' => $title->getNamespace()
) );
Hooks::run( 'AbuseFilter-generateTitleVars', array( $vars, $title, $prefix ) );
return $vars;
}
/**
* @param $filter
* @return mixed
*/
public static function checkSyntax( $filter ) {
global $wgAbuseFilterParserClass;
/** @var $parser AbuseFilterParser */
$parser = new $wgAbuseFilterParserClass;
return $parser->checkSyntax( $filter );
}
/**
* @param $expr
* @param array $vars
* @return string
*/
public static function evaluateExpression( $expr, $vars = array() ) {
global $wgAbuseFilterParserClass;
if ( self::checkSyntax( $expr ) !== true ) {
return 'BADSYNTAX';
}
/** @var $parser AbuseFilterParser */
$parser = new $wgAbuseFilterParserClass( $vars );
return $parser->evaluateExpression( $expr );
}
/**
* @param $conds
* @param $vars
* @param $ignoreError bool
* @return bool
* @throws Exception
*/
public static function checkConditions(
$conds, $vars, $ignoreError = true
) {
global $wgAbuseFilterParserClass;
static $parser, $lastVars;
if ( is_null( $parser ) || $vars !== $lastVars ) {
/** @var $parser AbuseFilterParser */
$parser = new $wgAbuseFilterParserClass( $vars );
$lastVars = $vars;
}
try {
$result = $parser->parse( $conds, self::$condCount );
} catch ( Exception $excep ) {
// Sigh.
$result = false;
wfDebugLog( 'AbuseFilter', 'AbuseFilter parser error: ' . $excep->getMessage() . "\n" );
if ( !$ignoreError ) {
throw $excep;
}
}
return $result;
}
/**
* Returns an associative array of filters which were tripped
*
* @param $vars AbuseFilterVariableHolder
* @param string $group The filter's group (as defined in $wgAbuseFilterValidGroups)
*
* @return bool[] Map of (integer filter ID => bool)
*/
public static function checkAllFilters( $vars, $group = 'default' ) {
global $wgAbuseFilterCentralDB, $wgAbuseFilterIsCentral;
// Fetch from the database.
$filter_matched = array();
$dbr = wfGetDB( DB_SLAVE );
$res = $dbr->select(
'abuse_filter',
'*',
array(
'af_enabled' => 1,
'af_deleted' => 0,
'af_group' => $group,
),
__METHOD__
);
foreach ( $res as $row ) {
$filter_matched[$row->af_id] = self::checkFilter( $row, $vars, true );
}
if ( $wgAbuseFilterCentralDB && !$wgAbuseFilterIsCentral ) {
// Global filters
$globalRulesKey = self::getGlobalRulesKey( $group );
$fname = __METHOD__;
$res = ObjectCache::getMainWANInstance()->getWithSetCallback(
$globalRulesKey,
WANObjectCache::TTL_INDEFINITE,
function () use ( $group, $fname ) {
global $wgAbuseFilterCentralDB;
$fdb = wfGetLB( $wgAbuseFilterCentralDB )->getConnectionRef(
DB_SLAVE, array(), $wgAbuseFilterCentralDB
);
return iterator_to_array( $fdb->select(
'abuse_filter',
'*',
array(
'af_enabled' => 1,
'af_deleted' => 0,
'af_global' => 1,
'af_group' => $group,
),
$fname
) );
},
array(
'checkKeys' => array( $globalRulesKey ),
'lockTSE' => 300
)
);
foreach ( $res as $row ) {
$filter_matched['global-' . $row->af_id] =
self::checkFilter( $row, $vars, true, 'global-' );
}
}
// Update statistics, and disable filters which are over-blocking.
self::recordStats( $filter_matched, $group );
return $filter_matched;
}
/**
* @static
* @param $row
* @param $vars
* @param $profile bool
* @param $prefix string
* @return bool
*/
public static function checkFilter( $row, $vars, $profile = false, $prefix = '' ) {
global $wgAbuseFilterProfile;
$filterID = $prefix . $row->af_id;
$startConds = $startTime = null;
if ( $profile && $wgAbuseFilterProfile ) {
$startConds = self::$condCount;
$startTime = microtime( true );
}
// Store the row somewhere convenient
self::$filterCache[$filterID] = $row;
// Check conditions...
$pattern = trim( $row->af_pattern );
if (
self::checkConditions(
$pattern,
$vars,
true /* ignore errors */
)
) {
// Record match.
$result = true;
} else {
// Record non-match.
$result = false;
}
if ( $profile && $wgAbuseFilterProfile ) {
$endTime = microtime( true );
$endConds = self::$condCount;
$timeTaken = $endTime - $startTime;
$condsUsed = $endConds - $startConds;
self::recordProfilingResult( $row->af_id, $timeTaken, $condsUsed );
}
return $result;
}
/**
* @param $filter
*/
public static function resetFilterProfile( $filter ) {
$stash = ObjectCache::getMainStashInstance();
$countKey = wfMemcKey( 'abusefilter', 'profile', $filter, 'count' );
$totalKey = wfMemcKey( 'abusefilter', 'profile', $filter, 'total' );
$condsKey = wfMemcKey( 'abusefilter', 'profile', $filter, 'conds' );
$stash->delete( $countKey );
$stash->delete( $totalKey );
$stash->delete( $condsKey );
}
/**
* @param $filter
* @param $time
* @param $conds
*/
public static function recordProfilingResult( $filter, $time, $conds ) {
// Defer updates to avoid massive (~1 second) edit time increases
DeferredUpdates::addCallableUpdate( function () use ( $filter, $time, $conds ) {
$stash = ObjectCache::getMainStashInstance();
$countKey = wfMemcKey( 'abusefilter', 'profile', $filter, 'count' );
$totalKey = wfMemcKey( 'abusefilter', 'profile', $filter, 'total' );
$condsKey = wfMemcKey( 'abusefilter', 'profile', $filter, 'conds' );
$curCount = $stash->get( $countKey );
$curTotal = $stash->get( $totalKey );
$curConds = $stash->get( $condsKey );
if ( $curCount ) {
$stash->set( $condsKey, $curConds + $conds, 3600 );
$stash->set( $totalKey, $curTotal + $time, 3600 );
$stash->incr( $countKey );
} else {
$stash->set( $countKey, 1, 3600 );
$stash->set( $totalKey, $time, 3600 );
$stash->set( $condsKey, $conds, 3600 );
}
} );
}
/**
* @param $filter
* @return array
*/
public static function getFilterProfile( $filter ) {
$stash = ObjectCache::getMainStashInstance();
$countKey = wfMemcKey( 'abusefilter', 'profile', $filter, 'count' );
$totalKey = wfMemcKey( 'abusefilter', 'profile', $filter, 'total' );
$condsKey = wfMemcKey( 'abusefilter', 'profile', $filter, 'conds' );
$curCount = $stash->get( $countKey );
$curTotal = $stash->get( $totalKey );
$curConds = $stash->get( $condsKey );
if ( !$curCount ) {
return array( 0, 0 );
}
$timeProfile = ( $curTotal / $curCount ) * 1000; // 1000 ms in a sec
$timeProfile = round( $timeProfile, 2 ); // Return in ms, rounded to 2dp
$condProfile = ( $curConds / $curCount );
$condProfile = round( $condProfile, 0 );
return array( $timeProfile, $condProfile );
}
/**
* Utility function to decode global-$index to $index. Returns false if not global
*
* @param $filter string
*
* @return string|bool
*/
public static function decodeGlobalName( $filter ) {
if ( strpos( $filter, 'global-' ) == 0 ) {
return substr( $filter, strlen( 'global-' ) );
}
return false;
}
/**
* @param $filters array
* @return array
*/
public static function getConsequencesForFilters( $filters ) {
$globalFilters = array();
$localFilters = array();
foreach ( $filters as $filter ) {
$globalIndex = self::decodeGlobalName( $filter );
if ( $globalIndex ) {
$globalFilters[] = $globalIndex;
} else {
$localFilters[] = $filter;
}
}
global $wgAbuseFilterCentralDB;
// Load local filter info
$dbr = wfGetDB( DB_SLAVE );
// Retrieve the consequences.
$consequences = array();
if ( count( $localFilters ) ) {
$consequences = self::loadConsequencesFromDB( $dbr, $localFilters );
}
if ( count( $globalFilters ) ) {
$fdb = wfGetDB( DB_SLAVE, array(), $wgAbuseFilterCentralDB );
$consequences = $consequences + self::loadConsequencesFromDB( $fdb, $globalFilters, 'global-' );
}
return $consequences;
}
/**
* @param $dbr DatabaseBase
* @param $filters array
* @param $prefix string
* @return array
*/
public static function loadConsequencesFromDB( $dbr, $filters, $prefix = '' ) {
$actionsByFilter = array();
foreach ( $filters as $filter ) {
$actionsByFilter[$prefix . $filter] = array();
}
$res = $dbr->select(
array( 'abuse_filter_action', 'abuse_filter' ),
'*',
array( 'af_id' => $filters ),
__METHOD__,
array(),
array( 'abuse_filter_action' => array( 'LEFT JOIN', 'afa_filter=af_id' ) )
);
// Categorise consequences by filter.
global $wgAbuseFilterRestrictions;
foreach ( $res as $row ) {
if ( $row->af_throttled
&& !empty( $wgAbuseFilterRestrictions[$row->afa_consequence] )
) {
# Don't do the action
} elseif ( $row->afa_filter != $row->af_id ) {
// We probably got a NULL, as it's a LEFT JOIN.
// Don't add it.
} else {
$actionsByFilter[$prefix . $row->afa_filter][$row->afa_consequence] = array(
'action' => $row->afa_consequence,
'parameters' => explode( "\n", $row->afa_parameters )
);
}
}
return $actionsByFilter;
}
/**
* Executes a list of actions.
*
* @param $filters array
* @param $title Title
* @param $vars AbuseFilterVariableHolder
* @return Status returns the operation's status. $status->isOK() will return true if
* there were no actions taken, false otherwise. $status->getValue() will return
* an array listing the actions taken. $status-getErrors(), etc, will provide
* the errors and warnings to be shown to the user to explain the actions.
*/
public static function executeFilterActions( $filters, $title, $vars ) {
global $wgMainCacheType;
$actionsByFilter = self::getConsequencesForFilters( $filters );
$actionsTaken = array_fill_keys( $filters, array() );
$messages = array();
global $wgOut, $wgAbuseFilterDisallowGlobalLocalBlocks, $wgAbuseFilterRestrictions;
foreach ( $actionsByFilter as $filter => $actions ) {
// Special-case handling for warnings.
$parsed_public_comments = $wgOut->parseInline(
self::getFilter( $filter )->af_public_comments
);
$global_filter = ( preg_match( '/^global-/', $filter ) == 1 );
// If the filter is throttled and throttling is available via object
// caching, check to see if the user has hit the throttle.
if ( !empty( $actions['throttle'] ) && $wgMainCacheType !== CACHE_NONE ) {
$parameters = $actions['throttle']['parameters'];
$throttleId = array_shift( $parameters );
list( $rateCount, $ratePeriod ) = explode( ',', array_shift( $parameters ) );
$hitThrottle = false;
// The rest are throttle-types.
foreach ( $parameters as $throttleType ) {
$hitThrottle = $hitThrottle || self::isThrottled(
$throttleId, $throttleType, $title, $rateCount, $ratePeriod, $global_filter );
}
unset( $actions['throttle'] );
if ( !$hitThrottle ) {
$actionsTaken[$filter][] = 'throttle';
continue;
}
}
if ( $wgAbuseFilterDisallowGlobalLocalBlocks && $global_filter ) {
$actions = array_diff_key( $actions, array_filter( $wgAbuseFilterRestrictions ) );
}
if ( !empty( $actions['warn'] ) ) {
$parameters = $actions['warn']['parameters'];
$warnKey = 'abusefilter-warned-' . md5( $title->getPrefixedText() ) . '-' . $filter;
// Make sure the session is started prior to using it
if ( session_id() === '' ) {
wfSetupSession();
}
if ( !isset( $_SESSION[$warnKey] ) || !$_SESSION[$warnKey] ) {
$_SESSION[$warnKey] = true;
// Threaten them a little bit
if ( !empty( $parameters[0] ) && strlen( $parameters[0] ) ) {
$msg = $parameters[0];
} else {
$msg = 'abusefilter-warning';
}
$messages[] = array( $msg, $parsed_public_comments, $filter );
$actionsTaken[$filter][] = 'warn';
continue; // Don't do anything else.
} else {
// We already warned them
$_SESSION[$warnKey] = false;
}
unset( $actions['warn'] );
}
// prevent double warnings
if ( count( array_intersect_key( $actions, array_filter( $wgAbuseFilterRestrictions ) ) ) > 0 &&
!empty( $actions['disallow'] )
) {
unset( $actions['disallow'] );
}
// Do the rest of the actions
foreach ( $actions as $action => $info ) {
$newMsg = self::takeConsequenceAction(
$action,
$info['parameters'],
$title,
$vars,
self::getFilter( $filter )->af_public_comments,
$filter
);
if ( $newMsg !== null ) {
$messages[] = $newMsg;
}
$actionsTaken[$filter][] = $action;
}
}
return self::buildStatus( $actionsTaken, $messages );
}
/**
* Constructs a Status object as returned by executeFilterActions() from the list of
* actions taken and the corresponding list of messages.
*
* @param array[] $actionsTaken associative array mapping each filter to the list if
* actions taken because of that filter.
* @param array[] $messages a list if arrays, where each array contains a message key
* followed by any message parameters.
*
* @return Status
*/
protected static function buildStatus( array $actionsTaken, array $messages ) {
$status = Status::newGood( $actionsTaken );
foreach ( $messages as $msg ) {
call_user_func_array( array( $status, 'fatal' ), $msg );
}
return $status;
}
/**
* @param $vars AbuseFilterVariableHolder
* @param $title Title
* @param string $group The filter's group (as defined in $wgAbuseFilterValidGroups)
* @param User $user The user performing the action; defaults to $wgUser
* @param string $mode Use 'execute' to run filters and log or 'stash' to only cache matches
* @return Status
*/
public static function filterAction(
$vars, $title, $group = 'default', $user = null, $mode = 'execute'
) {
global $wgUser, $wgTitle, $wgRequest;
$context = RequestContext::getMain();
$oldContextTitle = $context->getTitle();
$oldWgTitle = $wgTitle;
if ( !$wgTitle ) {
$wgTitle = SpecialPage::getTitleFor( 'AbuseFilter' );
}
if ( !$user ) {
$user = $wgUser;
}
$logger = LoggerFactory::getInstance( 'StashEdit' );
$statsd = MediaWikiServices::getInstance()->getStatsdDataFactory();
// Add vars from extensions
Hooks::run( 'AbuseFilter-filterAction', array( &$vars, $title ) );
$vars->setVar( 'context', 'filter' );
$vars->setVar( 'timestamp', time() );
// Get the stash key based on the relevant "input" variables
$cache = ObjectCache::getLocalClusterInstance();
$stashKey = self::getStashKey( $cache, $vars, $group );
$isForEdit = ( $vars->getVar( 'action' )->toString() === 'edit' );
$filter_matched = false;
if ( $mode === 'execute' && $isForEdit ) {
// Check the filter edit stash results first
$cacheData = $cache->get( $stashKey );
if ( $cacheData ) {
$filter_matched = $cacheData['matches'];
// Merge in any tags to apply to recent changes entries
self::bufferTagsToSetByAction( $cacheData['tags'] );
}
}
if ( is_array( $filter_matched ) ) {
if ( $isForEdit && $mode !== 'stash' ) {
$logger->info( __METHOD__ . ": cache hit for '$title' (key $stashKey)." );
$statsd->increment( 'abusefilter.check-stash.hit' );
}
} else {
$filter_matched = self::checkAllFilters( $vars, $group );
if ( $isForEdit && $mode !== 'stash' ) {
$logger->info( __METHOD__ . ": cache miss for '$title' (key $stashKey)." );
$statsd->increment( 'abusefilter.check-stash.miss' );
}
}
if ( $mode === 'stash' ) {
// Save the filter stash result and do nothing further
$cacheData = [ 'matches' => $filter_matched, 'tags' => self::$tagsToSet ];
$cache->set( $stashKey, $cacheData, $cache::TTL_MINUTE );
$logger->debug( __METHOD__ . ": cache store for '$title' (key $stashKey)." );
$statsd->increment( 'abusefilter.check-stash.store' );
return Status::newGood();
}
$matched_filters = array_keys( array_filter( $filter_matched ) );
if ( count( $matched_filters ) == 0 ) {
$status = Status::newGood();
} else {
$status = self::executeFilterActions( $matched_filters, $title, $vars );
$actions_taken = $status->value; // getValue() was introduced only in 1.20
$action = $vars->getVar( 'ACTION' )->toString();
// If $wgUser isn't safe to load (e.g. a failure during
// AbortAutoAccount), create a dummy anonymous user instead.
$user = $user->isSafeToLoad() ? $user : new User;
// Create a template
$log_template = array(
'afl_user' => $user->getId(),
'afl_user_text' => $user->getName(),
'afl_timestamp' => wfGetDB( DB_SLAVE )->timestamp( wfTimestampNow() ),
'afl_namespace' => $title->getNamespace(),
'afl_title' => $title->getDBkey(),
'afl_ip' => $wgRequest->getIP()
);
// Hack to avoid revealing IPs of people creating accounts
if ( !$user->getId() && ( $action == 'createaccount' || $action == 'autocreateaccount' ) ) {
$log_template['afl_user_text'] = $vars->getVar( 'accountname' )->toString();
}
self::addLogEntries( $actions_taken, $log_template, $action, $vars, $group );
}
// Bug 53498: If we screwed around with $wgTitle, reset it so the title
// is correctly picked up from the request later. Do the same for the
// main RequestContext, because that might have picked up the bogus
// title from $wgTitle.
if ( $wgTitle !== $oldWgTitle ) {
$wgTitle = $oldWgTitle;
}
if ( $context->getTitle() !== $oldContextTitle && $oldContextTitle instanceof Title ) {
$context->setTitle( $oldContextTitle );
}
return $status;
}
/**
* @param string $id Filter ID (integer or "global-<integer>")
* @return stdClass|null DB row
*/
public static function getFilter( $id ) {
global $wgAbuseFilterCentralDB;
if ( !isset( self::$filterCache[$id] ) ) {
$m = [];
if ( preg_match( '/^global-(\d+)$/', $id, $m ) ) {
// Global wiki filter
if ( !$wgAbuseFilterCentralDB ) {
return null; // not enabled
}
$id = $m[1];
$lb = wfGetLB( $wgAbuseFilterCentralDB );
$dbr = $lb->getConnectionRef( DB_SLAVE, array(), $wgAbuseFilterCentralDB );
} else {
// Local wiki filter
$dbr = wfGetDB( DB_SLAVE );
}
$row = $dbr->selectRow( 'abuse_filter', '*', [ 'af_id' => $id ], __METHOD__ );
self::$filterCache[$id] = $row ?: null;
}
return self::$filterCache[$id];
}
/**
* @param BagOStuff $cache
* @param $vars AbuseFilterVariableHolder
* @param string $group The filter's group (as defined in $wgAbuseFilterValidGroups)
*
* @return string
*/
private static function getStashKey(
BagOStuff $cache, AbuseFilterVariableHolder $vars, $group
) {
$inputVars = $vars->exportNonLazyVars();
// Exclude noisy fields that have superficial changes
unset( $inputVars['old_html'] );
unset( $inputVars['new_html'] );
unset( $inputVars['user_age'] );
unset( $inputVars['timestamp'] );
unset( $inputVars['_VIEWS'] );
ksort( $inputVars );
$hash = md5( serialize( $inputVars ) );
return ObjectCache::getLocalClusterInstance()->makeKey(
'abusefilter',
'check-stash',
$group,
$hash,
'v1'
);
}
/**
* @param $actions_taken
* @param $log_template
* @param $action
* @param $vars AbuseFilterVariableHolder
* @param string $group The filter's group (as defined in $wgAbuseFilterValidGroups)
* @return mixed
*/
public static function addLogEntries( $actions_taken, $log_template, $action,
$vars, $group = 'default'
) {
$dbw = wfGetDB( DB_MASTER );
$central_log_template = array(
'afl_wiki' => wfWikiID(),
);
$log_rows = array();
$central_log_rows = array();
$logged_local_filters = array();
$logged_global_filters = array();
foreach ( $actions_taken as $filter => $actions ) {
$globalIndex = self::decodeGlobalName( $filter );
$thisLog = $log_template;
$thisLog['afl_filter'] = $filter;
$thisLog['afl_action'] = $action;
$thisLog['afl_actions'] = implode( ',', $actions );
// Don't log if we were only throttling.
if ( $thisLog['afl_actions'] != 'throttle' ) {
$log_rows[] = $thisLog;
if ( !$globalIndex ) {
$logged_local_filters[] = $filter;
}
// Global logging
if ( $globalIndex ) {
$title = Title::makeTitle( $thisLog['afl_namespace'], $thisLog['afl_title'] );
$centralLog = $thisLog + $central_log_template;
$centralLog['afl_filter'] = $globalIndex;
$centralLog['afl_title'] = $title->getPrefixedText();
$centralLog['afl_namespace'] = 0;
$central_log_rows[] = $centralLog;
$logged_global_filters[] = $globalIndex;
}
}
}
if ( !count( $log_rows ) ) {
return;
}
// Only store the var dump if we're actually going to add log rows.
$var_dump = self::storeVarDump( $vars );
$var_dump = "stored-text:$var_dump"; // To distinguish from stuff stored directly
wfProfileIn( __METHOD__ . '-hitstats' );
$stash = ObjectCache::getMainStashInstance();
// Increment trigger counter
$stash->incr( self::filterMatchesKey() );
$local_log_ids = array();
global $wgAbuseFilterNotifications, $wgAbuseFilterNotificationsPrivate;
foreach ( $log_rows as $data ) {
$data['afl_var_dump'] = $var_dump;
$data['afl_id'] = $dbw->nextSequenceValue( 'abuse_filter_log_afl_id_seq' );
$dbw->insert( 'abuse_filter_log', $data, __METHOD__ );
$local_log_ids[] = $dbw->insertId();
if ( $data['afl_id'] === null ) {
$data['afl_id'] = $dbw->insertId();
}
$entry = new ManualLogEntry( 'abusefilter', 'hit' );
// Construct a user object
$user = User::newFromId( $data['afl_user'] );
$user->setName( $data['afl_user_text'] );
$entry->setPerformer( $user );
// Set action target
$entry->setTarget( Title::makeTitle( $data['afl_namespace'], $data['afl_title'] ) );
// Additional info
$entry->setParameters( array(
'action' => $data['afl_action'],
'filter' => $data['afl_filter'],
'actions' => $data['afl_actions'],
'log' => $data['afl_id'],
) );
// Send data to CheckUser if installed and we
// aren't already sending a notification to recentchanges
// Requires MW 1.23+
if ( is_callable( 'CheckUserHooks::updateCheckUserData' )
&& is_callable( 'ManualLogEntry::getRecentChange' )
&& strpos( $wgAbuseFilterNotifications, 'rc' ) === false
) {
$rc = $entry->getRecentChange();
CheckUserHooks::updateCheckUserData( $rc );
}
if ( $wgAbuseFilterNotifications !== false ) {
if ( self::filterHidden( $data['afl_filter'] ) && !$wgAbuseFilterNotificationsPrivate ) {
continue;
}
$entry->publish( 0, $wgAbuseFilterNotifications );
}
}
$method = __METHOD__;
if ( count( $logged_local_filters ) ) {
// Update hit-counter.
$dbw->onTransactionPreCommitOrIdle(
function () use ( $dbw, $logged_local_filters, $method ) {
$dbw->update( 'abuse_filter',
array( 'af_hit_count=af_hit_count+1' ),
array( 'af_id' => $logged_local_filters ),
$method
);
}
);
}
$global_log_ids = array();
// Global stuff
if ( count( $logged_global_filters ) ) {
$vars->computeDBVars();
$global_var_dump = self::storeVarDump( $vars, true );
$global_var_dump = "stored-text:$global_var_dump";
foreach ( $central_log_rows as $index => $data ) {
$central_log_rows[$index]['afl_var_dump'] = $global_var_dump;
}
global $wgAbuseFilterCentralDB;
$fdb = wfGetDB( DB_MASTER, array(), $wgAbuseFilterCentralDB );
foreach ( $central_log_rows as $row ) {
$fdb->insert( 'abuse_filter_log', $row, __METHOD__ );
$global_log_ids[] = $dbw->insertId();
}
$fdb->onTransactionPreCommitOrIdle(
function () use ( $fdb, $logged_global_filters, $method ) {
$fdb->update( 'abuse_filter',
array( 'af_hit_count=af_hit_count+1' ),
array( 'af_id' => $logged_global_filters ),
$method
);
}
);
}
$vars->setVar( 'global_log_ids', $global_log_ids );
$vars->setVar( 'local_log_ids', $local_log_ids );
// Check for emergency disabling.
$total = $stash->get( AbuseFilter::filterUsedKey( $group ) );
self::checkEmergencyDisable( $group, $logged_local_filters, $total );
wfProfileOut( __METHOD__ . '-hitstats' );
}
/**
* Store a var dump to External Storage or the text table
* Some of this code is stolen from Revision::insertOn and friends
*
* @param $vars AbuseFilterVariableHolder
* @param $global bool
*
* @return int
*/
public static function storeVarDump( $vars, $global = false ) {
global $wgCompressRevisions;
// Get all variables yet set and compute old and new wikitext if not yet done
// as those are needed for the diff view on top of the abuse log pages
$vars = $vars->dumpAllVars( array( 'old_wikitext', 'new_wikitext' ) );
// Vars is an array with native PHP data types (non-objects) now
$text = serialize( $vars );
$flags = array( 'nativeDataArray' );
if ( $wgCompressRevisions ) {
if ( function_exists( 'gzdeflate' ) ) {
$text = gzdeflate( $text );
$flags[] = 'gzip';
}
}
// Store to ES if applicable
global $wgDefaultExternalStore, $wgAbuseFilterCentralDB;
if ( $wgDefaultExternalStore ) {
if ( $global ) {
$text = ExternalStore::insertToForeignDefault( $text, $wgAbuseFilterCentralDB );
} else {
$text = ExternalStore::insertToDefault( $text );
}
$flags[] = 'external';
if ( !$text ) {
// Not mission-critical, just return nothing
return null;
}
}
// Store to text table
if ( $global ) {
$dbw = wfGetDB( DB_MASTER, array(), $wgAbuseFilterCentralDB );
} else {
$dbw = wfGetDB( DB_MASTER );
}
$old_id = $dbw->nextSequenceValue( 'text_old_id_seq' );
$dbw->insert( 'text',
array(
'old_id' => $old_id,
'old_text' => $text,
'old_flags' => implode( ',', $flags ),
), __METHOD__
);
return $dbw->insertId();
}
/**
* Retrieve a var dump from External Storage or the text table
* Some of this code is stolen from Revision::loadText et al
*
* @param $stored_dump
*
* @return object|AbuseFilterVariableHolder|bool
*/
public static function loadVarDump( $stored_dump ) {
// Back-compat
if ( substr( $stored_dump, 0, strlen( 'stored-text:' ) ) !== 'stored-text:' ) {
$data = unserialize( $stored_dump );
if ( is_array( $data ) ) {
$vh = new AbuseFilterVariableHolder;
foreach ( $data as $name => $value ) {
$vh->setVar( $name, $value );
}
return $vh;
} else {
return $data;
}
}
$text_id = substr( $stored_dump, strlen( 'stored-text:' ) );
$dbr = wfGetDB( DB_SLAVE );
$text_row = $dbr->selectRow(
'text',
array( 'old_text', 'old_flags' ),
array( 'old_id' => $text_id ),
__METHOD__
);
if ( !$text_row ) {
return new AbuseFilterVariableHolder;
}
$flags = explode( ',', $text_row->old_flags );
$text = $text_row->old_text;
if ( in_array( 'external', $flags ) ) {
$text = ExternalStore::fetchFromURL( $text );
}
if ( in_array( 'gzip', $flags ) ) {
$text = gzinflate( $text );
}
$obj = unserialize( $text );
if ( in_array( 'nativeDataArray', $flags ) ) {
$vars = $obj;
$obj = new AbuseFilterVariableHolder();
foreach ( $vars as $key => $value ) {
$obj->setVar( $key, $value );
}
}
return $obj;
}
/**
* @param $action string
* @param $parameters array
* @param $title Title
* @param $vars AbuseFilterVariableHolder
* @param $rule_desc
* @param $rule_number int|string
*
* @return array|null a message describing the action that was taken,
* or null if no action was taken. The message is given as an array
* containing the message key followed by any message parameters.
*
* @note: Returning the message as an array instead of a Message object is
* needed for compatibility with MW 1.20: we will be constructing a
* Status object from these messages, and before 1.21, Status did
* not accept Message objects to be added directly.
*/
public static function takeConsequenceAction( $action, $parameters, $title,
$vars, $rule_desc, $rule_number ) {
global $wgAbuseFilterCustomActionsHandlers, $wgRequest;
$message = null;
switch ( $action ) {
case 'disallow':
if ( strlen( $parameters[0] ) ) {
$message = array( $parameters[0], $rule_desc, $rule_number );
} else {
// Generic message.
$message = array(
'abusefilter-disallowed',
$rule_desc,
$rule_number
);
}
break;
case 'block':
global $wgAbuseFilterBlockDuration, $wgAbuseFilterAnonBlockDuration, $wgUser;
if ( $wgUser->isAnon() && $wgAbuseFilterAnonBlockDuration !== null ) {
// The user isn't logged in and the anon block duration
// doesn't default to $wgAbuseFilterBlockDuration.
$expiry = $wgAbuseFilterAnonBlockDuration;
} else {
$expiry = $wgAbuseFilterBlockDuration;
}
self::doAbuseFilterBlock(
array(
'desc' => $rule_desc,
'number' => $rule_number
),
$wgUser->getName(),
$expiry,
true
);
$message = array(
'abusefilter-blocked-display',
$rule_desc,
$rule_number
);
break;
case 'rangeblock':
self::doAbuseFilterBlock(
array(
'desc' => $rule_desc,
'number' => $rule_number
),
IP::sanitizeRange( $wgRequest->getIP() . '/16' ),
'1 week',
false
);
$message = array(
'abusefilter-blocked-display',
$rule_desc,
$rule_number
);
break;
case 'degroup':
global $wgUser;
if ( !$wgUser->isAnon() ) {
// Remove all groups from the user. Ouch.
$groups = $wgUser->getGroups();
foreach ( $groups as $group ) {
$wgUser->removeGroup( $group );
}
$message = array(
'abusefilter-degrouped',
$rule_desc,
$rule_number
);
// Don't log it if there aren't any groups being removed!
if ( !count( $groups ) ) {
break;
}
// Log it.
$log = new LogPage( 'rights' );
$log->addEntry( 'rights',
$wgUser->getUserPage(),
wfMessage(
'abusefilter-degroupreason',
$rule_desc,
$rule_number
)->inContentLanguage()->text(),
array(
implode( ', ', $groups ),
''
),
self::getFilterUser()
);
}
break;
case 'blockautopromote':
global $wgUser;
if ( !$wgUser->isAnon() ) {
$blockPeriod = (int)mt_rand( 3 * 86400, 7 * 86400 ); // Block for 3-7 days.
ObjectCache::getMainStashInstance()->set(
self::autoPromoteBlockKey( $wgUser ), true, $blockPeriod
);
$message = array(
'abusefilter-autopromote-blocked',
$rule_desc,
$rule_number
);
}
break;
case 'flag':
// Do nothing. Here for completeness.
break;
case 'tag':
// Mark with a tag on recentchanges.
global $wgUser;
$actionID = implode( '-', array(
$title->getPrefixedText(), $wgUser->getName(),
$vars->getVar( 'ACTION' )->toString()
) );
self::bufferTagsToSetByAction( [ $actionID => $parameters ] );
break;
default:
if ( isset( $wgAbuseFilterCustomActionsHandlers[$action] ) ) {
$custom_function = $wgAbuseFilterCustomActionsHandlers[$action];
if ( is_callable( $custom_function ) ) {
$msg = call_user_func(
$custom_function,
$action,
$parameters,
$title,
$vars,
$rule_desc,
$rule_number
);
}
if ( isset( $msg ) ) {
$message = array( $msg );
}
} else {
wfDebugLog( 'AbuseFilter', "Unrecognised action $action" );
}
}
return $message;
}
/**
* @param array[] $tagsByAction Map of (integer => string[])
*/
private static function bufferTagsToSetByAction( array $tagsByAction ) {
foreach ( $tagsByAction as $actionID => $tags ) {
if ( !isset( self::$tagsToSet[$actionID] ) ) {
self::$tagsToSet[$actionID] = $tags;
} else {
self::$tagsToSet[$actionID] = array_merge( self::$tagsToSet[$actionID], $tags );
}
}
}
/**
* Perform a block by the AbuseFilter system user
* @param array $rule should have 'desc' and 'number'
* @param string $target
* @param string $expiry
* @param bool $isAutoBlock
*/
protected static function doAbuseFilterBlock( array $rule, $target, $expiry, $isAutoBlock ) {
$filterUser = AbuseFilter::getFilterUser();
$reason = wfMessage(
'abusefilter-blockreason',
$rule['desc'], $rule['number']
)->inContentLanguage()->text();
$block = new Block();
$block->setTarget( $target );
$block->setBlocker( $filterUser );
$block->mReason = $reason;
$block->isHardblock( false );
$block->isAutoblocking( $isAutoBlock );
$block->prevents( 'createaccount', true );
$block->prevents( 'editownusertalk', false );
$block->mExpiry = SpecialBlock::parseExpiryInput( $expiry );
$success = $block->insert();
if ( $success ) {
// Log it only if the block was successful
$logParams = array();
$logParams['5::duration'] = ( $block->mExpiry === 'infinity' )
? 'indefinite'
: $expiry;
$flags = array( 'nocreate' );
if ( !$block->isAutoblocking() && !IP::isIPAddress( $target ) ) {
// Conditionally added same as SpecialBlock
$flags[] = 'noautoblock';
}
$logParams['6::flags'] = implode( ',', $flags );
$logEntry = new ManualLogEntry( 'block', 'block' );
$logEntry->setTarget( Title::makeTitle( NS_USER, $target ) );
$logEntry->setComment( $reason );
$logEntry->setPerformer( $filterUser );
$logEntry->setParameters( $logParams );
$blockIds = array_merge( array( $success['id'] ), $success['autoIds'] );
$logEntry->setRelations( array( 'ipb_id' => $blockIds ) );
$logEntry->publish( $logEntry->insert() );
}
}
/**
* @param $throttleId
* @param $types
* @param $title
* @param $rateCount
* @param $ratePeriod
* @param $global bool
* @return bool
*/
public static function isThrottled( $throttleId, $types, $title, $rateCount,
$ratePeriod, $global = false
) {
$stash = ObjectCache::getMainStashInstance();
$key = self::throttleKey( $throttleId, $types, $title, $global );
$count = intval( $stash->get( $key ) );
wfDebugLog( 'AbuseFilter', "Got value $count for throttle key $key\n" );
if ( $count > 0 ) {
$stash->incr( $key );
$count++;
wfDebugLog( 'AbuseFilter', "Incremented throttle key $key" );
} else {
wfDebugLog( 'AbuseFilter', "Added throttle key $key with value 1" );
$stash->add( $key, 1, $ratePeriod );
$count = 1;
}
if ( $count > $rateCount ) {
wfDebugLog( 'AbuseFilter', "Throttle $key hit value $count -- maximum is $rateCount." );
return true; // THROTTLED
}
wfDebugLog( 'AbuseFilter', "Throttle $key not hit!" );
return false; // NOT THROTTLED
}
/**
* @param $type
* @param $title Title
* @return int|string
*/
public static function throttleIdentifier( $type, $title ) {
global $wgUser, $wgRequest;
switch ( $type ) {
case 'ip':
$identifier = $wgRequest->getIP();
break;
case 'user':
$identifier = $wgUser->getId();
break;
case 'range':
$identifier = substr( IP::toHex( $wgRequest->getIP() ), 0, 4 );
break;
case 'creationdate':
$reg = $wgUser->getRegistration();
$identifier = $reg - ( $reg % 86400 );
break;
case 'editcount':
// Hack for detecting different single-purpose accounts.
$identifier = $wgUser->getEditCount();
break;
case 'site':
$identifier = 1;
break;
case 'page':
$identifier = $title->getPrefixedText();
break;
default:
$identifier = 0;
}
return $identifier;
}
/**
* @param $throttleId
* @param $type
* @param $title Title
* @param $global bool
* @return String
*/
public static function throttleKey( $throttleId, $type, $title, $global = false ) {
$types = explode( ',', $type );
$identifiers = array();
foreach ( $types as $subtype ) {
$identifiers[] = self::throttleIdentifier( $subtype, $title );
}
$identifier = sha1( implode( ':', $identifiers ) );
global $wgAbuseFilterIsCentral, $wgAbuseFilterCentralDB;
if ( $global && !$wgAbuseFilterIsCentral ) {
list ( $globalSite, $globalPrefix ) = wfSplitWikiID( $wgAbuseFilterCentralDB );
return wfForeignMemcKey(
$globalSite, $globalPrefix,
'abusefilter', 'throttle', $throttleId, $type, $identifier );
}
return wfMemcKey( 'abusefilter', 'throttle', $throttleId, $type, $identifier );
}
/**
* @param string $group The filter's group (as defined in $wgAbuseFilterValidGroups)
* @return String
*/
public static function getGlobalRulesKey( $group ) {
global $wgAbuseFilterIsCentral, $wgAbuseFilterCentralDB;
if ( !$wgAbuseFilterIsCentral ) {
list ( $globalSite, $globalPrefix ) = wfSplitWikiID( $wgAbuseFilterCentralDB );
return wfForeignMemcKey(
$globalSite, $globalPrefix,
'abusefilter', 'rules', $group
);
}
return wfMemcKey( 'abusefilter', 'rules', $group );
}
/**
* @param $user User
* @return String
*/
public static function autoPromoteBlockKey( $user ) {
return wfMemcKey( 'abusefilter', 'block-autopromote', $user->getId() );
}
/**
* Update statistics, and disable filters which are over-blocking.
* @param $filters
* @param string $group The filter's group (as defined in $wgAbuseFilterValidGroups)
*/
public static function recordStats( $filters, $group = 'default' ) {
global $wgAbuseFilterConditionLimit;
$stash = ObjectCache::getMainStashInstance();
// Figure out if we've triggered overflows and blocks.
$overflow_triggered = ( self::$condCount > $wgAbuseFilterConditionLimit );
// Store some keys...
$overflow_key = self::filterLimitReachedKey();
$total_key = self::filterUsedKey( $group );
$total = $stash->get( $total_key );
$storage_period = self::$statsStoragePeriod;
if ( !$total || $total > 10000 ) {
// This is for if the total doesn't exist, or has gone past 10,000.
// Recreate all the keys at the same time, so they expire together.
$stash->set( $total_key, 0, $storage_period );
$stash->set( $overflow_key, 0, $storage_period );
foreach ( $filters as $filter => $matched ) {
$stash->set( self::filterMatchesKey( $filter ), 0, $storage_period );
}
$stash->set( self::filterMatchesKey(), 0, $storage_period );
}
// Increment total
$stash->incr( $total_key );
// Increment overflow counter, if our condition limit overflowed
if ( $overflow_triggered ) {
$stash->incr( $overflow_key );
}
}
/**
* @param string $group The filter's group (as defined in $wgAbuseFilterValidGroups)
* @param $filters
* @param $total
*/
public static function checkEmergencyDisable( $group, $filters, $total ) {
global $wgAbuseFilterEmergencyDisableThreshold, $wgAbuseFilterEmergencyDisableCount,
$wgAbuseFilterEmergencyDisableAge;
$stash = ObjectCache::getMainStashInstance();
foreach ( $filters as $filter ) {
// determine emergency disable values for this action
$emergencyDisableThreshold =
self::getEmergencyValue( $wgAbuseFilterEmergencyDisableThreshold, $group );
$filterEmergencyDisableCount =
self::getEmergencyValue( $wgAbuseFilterEmergencyDisableCount, $group );
$emergencyDisableAge =
self::getEmergencyValue( $wgAbuseFilterEmergencyDisableAge, $group );
// Increment counter
$matchCount = $stash->get( self::filterMatchesKey( $filter ) );
// Handle missing keys...
if ( !$matchCount ) {
$stash->set( self::filterMatchesKey( $filter ), 1, self::$statsStoragePeriod );
} else {
$stash->incr( self::filterMatchesKey( $filter ) );
}
$matchCount++;
// Figure out if the filter is subject to being deleted.
$filter_age = wfTimestamp( TS_UNIX, self::getFilter( $filter )->af_timestamp );
$throttle_exempt_time = $filter_age + $emergencyDisableAge;
if ( $total && $throttle_exempt_time > time()
&& $matchCount > $filterEmergencyDisableCount
&& ( $matchCount / $total ) > $emergencyDisableThreshold
) {
// More than $wgAbuseFilterEmergencyDisableCount matches,
// constituting more than $emergencyDisableThreshold
// (a fraction) of last few edits. Disable it.
DeferredUpdates::addUpdate(
new AutoCommitUpdate(
wfGetDB( DB_MASTER ),
__METHOD__,
function ( IDatabase $dbw, $fname ) use ( $filter ) {
$dbw->update( 'abuse_filter',
array( 'af_throttled' => 1 ),
array( 'af_id' => $filter ),
$fname
);
}
)
);
}
}
}
/**
* @param array $emergencyValue
* @param string $group The filter's group (as defined in $wgAbuseFilterValidGroups)
* @return mixed
*/
public static function getEmergencyValue( array $emergencyValue, $group ) {
return isset( $emergencyValue[$group] ) ? $emergencyValue[$group] : $emergencyValue['default'];
}
/**
* @return String
*/
public static function filterLimitReachedKey() {
return wfMemcKey( 'abusefilter', 'stats', 'overflow' );
}
/**
* @param string $group The filter's group (as defined in $wgAbuseFilterValidGroups)
* @return String
*/
public static function filterUsedKey( $group = null ) {
return wfMemcKey( 'abusefilter', 'stats', 'total', $group );
}
/**
* @param $filter
* @return String
*/
public static function filterMatchesKey( $filter = null ) {
return wfMemcKey( 'abusefilter', 'stats', 'matches', $filter );
}
/**
* @return User
*/
public static function getFilterUser() {
$username = wfMessage( 'abusefilter-blocker' )->inContentLanguage()->text();
if ( method_exists( 'User', 'newSystemUser' ) ) {
$user = User::newSystemUser( $username, array( 'steal' => true ) );
} else {
$user = User::newFromName( $username );
$user->load();
if ( $user->getId() && $user->mPassword == '' ) {
// Already set up.
return $user;
}
// Not set up. Create it.
if ( !$user->getId() ) {
print 'Trying to create account -- user id is ' . $user->getId();
$user->addToDatabase();
$user->saveSettings();
// Increment site_stats.ss_users
$ssu = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
$ssu->doUpdate();
} else {
// Take over the account
$user->setPassword( null );
$user->setEmail( null );
$user->saveSettings();
}
}
// Promote user so it doesn't look too crazy.
$user->addGroup( 'sysop' );
return $user;
}
/**
* @param $rules String
* @param $textName String
* @param $addResultDiv Boolean
* @param $canEdit Boolean
* @return string
*/
static function buildEditBox( $rules, $textName = 'wpFilterRules', $addResultDiv = true,
$canEdit = true ) {
global $wgOut;
$textareaAttrib = array( 'dir' => 'ltr' ); # Rules are in English
if ( !$canEdit ) {
$textareaAttrib['readonly'] = 'readonly';
}
global $wgUser;
$noTestAttrib = array();
if ( !$wgUser->isAllowed( 'abusefilter-modify' ) ) {
$noTestAttrib['disabled'] = 'disabled';
$addResultDiv = false;
}
$rules = rtrim( $rules ) . "\n";
$rules = Xml::textarea( $textName, $rules, 40, 15, $textareaAttrib );
if ( $canEdit ) {
$dropDown = self::getBuilderValues();
// Generate builder drop-down
$builder = '';
$builder .= Xml::option( wfMessage( 'abusefilter-edit-builder-select' )->text() );
foreach ( $dropDown as $group => $values ) {
// Give grep a chance to find the usages:
// abusefilter-edit-builder-group-op-arithmetic, abusefilter-edit-builder-group-op-comparison,
// abusefilter-edit-builder-group-op-bool, abusefilter-edit-builder-group-misc,
// abusefilter-edit-builder-group-funcs, abusefilter-edit-builder-group-vars
$builder .=
Xml::openElement(
'optgroup',
array( 'label' => wfMessage( "abusefilter-edit-builder-group-$group" )->text() )
) . "\n";
foreach ( $values as $content => $name ) {
$builder .=
Xml::option(
wfMessage( "abusefilter-edit-builder-$group-$name" )->text(),
$content
) . "\n";
}
$builder .= Xml::closeElement( 'optgroup' ) . "\n";
}
$rules .=
Xml::tags(
'select',
array( 'id' => 'wpFilterBuilder', ),
$builder
) . ' ';
// Add syntax checking
$rules .= Xml::element( 'input',
array(
'type' => 'button',
'value' => wfMessage( 'abusefilter-edit-check' )->text(),
'id' => 'mw-abusefilter-syntaxcheck'
) + $noTestAttrib );
}
if ( $addResultDiv ) {
$rules .= Xml::element( 'div',
array( 'id' => 'mw-abusefilter-syntaxresult', 'style' => 'display: none;' ),
'&#160;' );
}
// Add script
$wgOut->addModules( 'ext.abuseFilter.edit' );
self::$editboxName = $textName;
return $rules;
}
/**
* Each version is expected to be an array( $row, $actions )
* Returns an array of fields that are different.
*
* @param $version_1
* @param $version_2
*
* @return array
*/
static function compareVersions( $version_1, $version_2 ) {
$compareFields = array(
'af_public_comments',
'af_pattern',
'af_comments',
'af_deleted',
'af_enabled',
'af_hidden',
'af_global',
'af_group',
);
$differences = array();
list( $row1, $actions1 ) = $version_1;
list( $row2, $actions2 ) = $version_2;
foreach ( $compareFields as $field ) {
if ( !isset( $row2->$field ) || $row1->$field != $row2->$field ) {
$differences[] = $field;
}
}
global $wgAbuseFilterActions;
foreach ( array_filter( $wgAbuseFilterActions ) as $action => $_ ) {
if ( !isset( $actions1[$action] ) && !isset( $actions2[$action] ) ) {
// They're both unset
} elseif ( isset( $actions1[$action] ) && isset( $actions2[$action] ) ) {
// They're both set.
if ( array_diff( $actions1[$action]['parameters'],
$actions2[$action]['parameters'] ) ) {
// Different parameters
$differences[] = 'actions';
}
} else {
// One's unset, one's set.
$differences[] = 'actions';
}
}
return array_unique( $differences );
}
/**
* @param $row
* @return array
*/
static function translateFromHistory( $row ) {
# Translate into an abuse_filter row with some black magic.
# This is ever so slightly evil!
$af_row = new StdClass;
foreach ( self::$history_mappings as $af_col => $afh_col ) {
$af_row->$af_col = $row->$afh_col;
}
# Process flags
$af_row->af_deleted = 0;
$af_row->af_hidden = 0;
$af_row->af_enabled = 0;
$flags = explode( ',', $row->afh_flags );
foreach ( $flags as $flag ) {
$col_name = "af_$flag";
$af_row->$col_name = 1;
}
# Process actions
$actions_raw = unserialize( $row->afh_actions );
$actions_output = array();
if ( is_array( $actions_raw ) ) {
foreach ( $actions_raw as $action => $parameters ) {
$actions_output[$action] = array(
'action' => $action,
'parameters' => $parameters
);
}
}
return array( $af_row, $actions_output );
}
/**
* @param $action string
* @return String
*/
static function getActionDisplay( $action ) {
// Give grep a chance to find the usages:
// abusefilter-action-tag, abusefilter-action-throttle, abusefilter-action-warn,
// abusefilter-action-blockautopromote, abusefilter-action-block, abusefilter-action-degroup,
// abusefilter-action-rangeblock, abusefilter-action-disallow
$display = wfMessage( "abusefilter-action-$action" )->text();
$display = wfMessage( "abusefilter-action-$action", $display )->isDisabled() ? $action : $display;
return $display;
}
/**
* @param $row
* @return AbuseFilterVariableHolder|null
*/
public static function getVarsFromRCRow( $row ) {
if ( $row->rc_this_oldid ) {
// It's an edit.
$vars = self::getEditVarsFromRCRow( $row );
} elseif ( $row->rc_log_type == 'move' ) {
$vars = self::getMoveVarsFromRCRow( $row );
} elseif ( $row->rc_log_type == 'newusers' ) {
$vars = self::getCreateVarsFromRCRow( $row );
} else {
return null;
}
if ( $vars ) {
$vars->setVar( 'context', 'generated' );
$vars->setVar( 'timestamp', wfTimestamp( TS_UNIX, $row->rc_timestamp ) );
}
return $vars;
}
/**
* @param $row
* @return AbuseFilterVariableHolder
*/
public static function getCreateVarsFromRCRow( $row ) {
$vars = new AbuseFilterVariableHolder;
$vars->setVar( 'ACTION', ( $row->rc_log_action == 'autocreate' ) ?
'autocreateaccount' :
'createaccount' );
$name = Title::makeTitle( $row->rc_namespace, $row->rc_title )->getText();
// Add user data if the account was created by a registered user
if ( $row->rc_user && $name != $row->rc_user_text ) {
$user = User::newFromName( $row->rc_user_text );
$vars->addHolders( self::generateUserVars( $user ) );
}
$vars->setVar( 'accountname', $name );
return $vars;
}
/**
* @param $row
* @return AbuseFilterVariableHolder
*/
public static function getEditVarsFromRCRow( $row ) {
$vars = new AbuseFilterVariableHolder;
$title = Title::makeTitle( $row->rc_namespace, $row->rc_title );
if ( $row->rc_user ) {
$user = User::newFromName( $row->rc_user_text );
} else {
$user = new User;
$user->setName( $row->rc_user_text );
}
$vars->addHolders(
self::generateUserVars( $user ),
self::generateTitleVars( $title, 'ARTICLE' )
);
$vars->setVar( 'ACTION', 'edit' );
$vars->setVar( 'SUMMARY', $row->rc_comment );
$vars->setLazyLoadVar( 'new_wikitext', 'revision-text-by-id',
array( 'revid' => $row->rc_this_oldid ) );
if ( $row->rc_last_oldid ) {
$vars->setLazyLoadVar( 'old_wikitext', 'revision-text-by-id',
array( 'revid' => $row->rc_last_oldid ) );
} else {
$vars->setVar( 'old_wikitext', '' );
}
$vars->addHolders( self::getEditVars( $title ) );
return $vars;
}
/**
* @param $row
* @return AbuseFilterVariableHolder
*/
public static function getMoveVarsFromRCRow( $row ) {
if ( $row->rc_user ) {
$user = User::newFromId( $row->rc_user );
} else {
$user = new User;
$user->setName( $row->rc_user_text );
}
$params = array_values( DatabaseLogEntry::newFromRow( $row )->getParameters() );
$oldTitle = Title::makeTitle( $row->rc_namespace, $row->rc_title );
$newTitle = Title::newFromText( $params[0] );
$vars = AbuseFilterVariableHolder::merge(
AbuseFilter::generateUserVars( $user ),
AbuseFilter::generateTitleVars( $oldTitle, 'MOVED_FROM' ),
AbuseFilter::generateTitleVars( $newTitle, 'MOVED_TO' )
);
$vars->setVar( 'SUMMARY', $row->rc_comment );
$vars->setVar( 'ACTION', 'move' );
return $vars;
}
/**
* @param Title $title
* @param null|Page $page
* @return AbuseFilterVariableHolder
*/
public static function getEditVars( $title, Page $page = null ) {
$vars = new AbuseFilterVariableHolder;
// NOTE: $page may end up remaining null, e.g. if $title points to a special page.
if ( !$page && $title instanceof Title && $title->canExist() ) {
$page = WikiPage::factory( $title );
}
$vars->setLazyLoadVar( 'edit_diff', 'diff',
array( 'oldtext-var' => 'old_wikitext', 'newtext-var' => 'new_wikitext' ) );
$vars->setLazyLoadVar( 'edit_diff_pst', 'diff',
array( 'oldtext-var' => 'old_wikitext', 'newtext-var' => 'new_pst' ) );
$vars->setLazyLoadVar( 'new_size', 'length', array( 'length-var' => 'new_wikitext' ) );
$vars->setLazyLoadVar( 'old_size', 'length', array( 'length-var' => 'old_wikitext' ) );
$vars->setLazyLoadVar( 'edit_delta', 'subtract',
array( 'val1-var' => 'new_size', 'val2-var' => 'old_size' ) );
// Some more specific/useful details about the changes.
$vars->setLazyLoadVar( 'added_lines', 'diff-split',
array( 'diff-var' => 'edit_diff', 'line-prefix' => '+' ) );
$vars->setLazyLoadVar( 'removed_lines', 'diff-split',
array( 'diff-var' => 'edit_diff', 'line-prefix' => '-' ) );
$vars->setLazyLoadVar( 'added_lines_pst', 'diff-split',
array( 'diff-var' => 'edit_diff_pst', 'line-prefix' => '+' ) );
// Links
$vars->setLazyLoadVar( 'added_links', 'link-diff-added',
array( 'oldlink-var' => 'old_links', 'newlink-var' => 'all_links' ) );
$vars->setLazyLoadVar( 'removed_links', 'link-diff-removed',
array( 'oldlink-var' => 'old_links', 'newlink-var' => 'all_links' ) );
$vars->setLazyLoadVar( 'new_text', 'strip-html',
array( 'html-var' => 'new_html' ) );
$vars->setLazyLoadVar( 'old_text', 'strip-html',
array( 'html-var' => 'old_html' ) );
if ( $title instanceof Title ) {
$vars->setLazyLoadVar( 'all_links', 'links-from-wikitext',
array(
'namespace' => $title->getNamespace(),
'title' => $title->getText(),
'text-var' => 'new_wikitext',
'article' => $page
) );
$vars->setLazyLoadVar( 'old_links', 'links-from-wikitext-or-database',
array(
'namespace' => $title->getNamespace(),
'title' => $title->getText(),
'text-var' => 'old_wikitext'
) );
$vars->setLazyLoadVar( 'new_pst', 'parse-wikitext',
array(
'namespace' => $title->getNamespace(),
'title' => $title->getText(),
'wikitext-var' => 'new_wikitext',
'article' => $page,
'pst' => true,
) );
$vars->setLazyLoadVar( 'new_html', 'parse-wikitext',
array(
'namespace' => $title->getNamespace(),
'title' => $title->getText(),
'wikitext-var' => 'new_wikitext',
'article' => $page
) );
$vars->setLazyLoadVar( 'old_html', 'parse-wikitext-nonedit',
array(
'namespace' => $title->getNamespace(),
'title' => $title->getText(),
'wikitext-var' => 'old_wikitext'
) );
}
return $vars;
}
/**
* @param AbuseFilterVariableHolder $vars
* @param IContextSource $context
* @return string
*/
public static function buildVarDumpTable( $vars, IContextSource $context ) {
// Export all values
if ( $vars instanceof AbuseFilterVariableHolder ) {
$vars = $vars->exportAllVars();
}
$output = '';
// I don't want to change the names of the pre-existing messages
// describing the variables, nor do I want to rewrite them, so I'm just
// mapping the variable names to builder messages with a pre-existing array.
$variableMessageMappings = self::getBuilderValues();
$variableMessageMappings = $variableMessageMappings['vars'];
$output .=
Xml::openElement( 'table', array( 'class' => 'mw-abuselog-details' ) ) .
Xml::openElement( 'tbody' ) .
"\n";
$header =
Xml::element( 'th', null, $context->msg( 'abusefilter-log-details-var' )->text() ) .
Xml::element( 'th', null, $context->msg( 'abusefilter-log-details-val' )->text() );
$output .= Xml::tags( 'tr', null, $header ) . "\n";
if ( !count( $vars ) ) {
$output .= Xml::closeElement( 'tbody' ) . Xml::closeElement( 'table' );
return $output;
}
// Now, build the body of the table.
foreach ( $vars as $key => $value ) {
$key = strtolower( $key );
if ( !empty( $variableMessageMappings[$key] ) ) {
$mapping = $variableMessageMappings[$key];
$keyDisplay = $context->msg( "abusefilter-edit-builder-vars-$mapping" )->parse() .
' ' . Xml::element( 'code', null, $context->msg( 'parentheses', $key )->text() );
} else {
$keyDisplay = Xml::element( 'code', null, $key );
}
if ( is_null( $value ) ) {
$value = '';
}
$value = Xml::element( 'div', array( 'class' => 'mw-abuselog-var-value' ), $value, false );
$trow =
Xml::tags( 'td', array( 'class' => 'mw-abuselog-var' ), $keyDisplay ) .
Xml::tags( 'td', array( 'class' => 'mw-abuselog-var-value' ), $value );
$output .=
Xml::tags( 'tr',
array( 'class' => "mw-abuselog-details-$key mw-abuselog-value" ), $trow
) . "\n";
}
$output .= Xml::closeElement( 'tbody' ) . Xml::closeElement( 'table' );
return $output;
}
/**
* @param $page
* @param $type
* @param $title Title
* @param $sk Skin
* @param $args array
* @param $filterWikilinks bool
* @return String
*/
static function modifyActionText( $page, $type, $title, $sk, $args, $filterWikilinks ) {
list( $history_id, $filter_id ) = $args;
$details_title = SpecialPage::getTitleFor(
'AbuseFilter',
"history/$filter_id/diff/prev/$history_id"
);
if ( !$filterWikilinks ) { // Plaintext? Bug 43105
return wfMessage(
'abusefilter-log-entry-modify',
'[[' . $title->getFullText() . ']]',
'[[' . $details_title->getFullText() . ']]' )->text();
}
$filter_link = Linker::link( $title );
$details_text = wfMessage( 'abusefilter-log-detailslink' )->parse();
$details_link = Linker::link( $details_title, $details_text );
return wfMessage( 'abusefilter-log-entry-modify' )
->rawParams( $filter_link, $details_link )->parse();
}
/**
* @param $action
* @param $parameters
* @return String
*/
static function formatAction( $action, $parameters ) {
/** @var $wgLang Language */
global $wgLang;
if ( count( $parameters ) == 0 ) {
$displayAction = AbuseFilter::getActionDisplay( $action );
} else {
$displayAction = AbuseFilter::getActionDisplay( $action ) .
wfMessage( 'colon-separator' )->escaped() .
$wgLang->semicolonList( $parameters );
}
return $displayAction;
}
/**
* @param $value array
* @return string
*/
static function formatFlags( $value ) {
/** @var $wgLang Language */
global $wgLang;
$flags = array_filter( explode( ',', $value ) );
$flags_display = array();
foreach ( $flags as $flag ) {
$flags_display[] = wfMessage( "abusefilter-history-$flag" )->text();
}
return $wgLang->commaList( $flags_display );
}
/**
* @param $filterID
* @return bool|mixed|string
*/
static function getGlobalFilterDescription( $filterID ) {
global $wgAbuseFilterCentralDB;
if ( !$wgAbuseFilterCentralDB ) {
return '';
}
$fdb = wfGetDB( DB_SLAVE, array(), $wgAbuseFilterCentralDB );
return $fdb->selectField(
'abuse_filter',
'af_public_comments',
array( 'af_id' => $filterID ),
__METHOD__
);
}
/**
* Gives either the user-specified name for a group,
* or spits the input back out
* @param string $group The filter's group (as defined in $wgAbuseFilterValidGroups)
* @return String A name for that filter group, or the input.
*/
static function nameGroup( $group ) {
// Give grep a chance to find the usages: abusefilter-group-default
$msg = "abusefilter-group-$group";
return wfMessage( $msg )->exists() ? wfMessage( $msg )->escaped() : $group;
}
/**
* Look up some text of a revision from its revision id
*
* Note that this is really *some* text, we do not make *any* guarantee
* that this text will be even close to what the user actually sees, or
* that the form is fit for any intended purpose.
*
* Note also that if the revision for any reason is not an Revision
* the function returns with an empty string.
*
* @param Revision $revision a valid revision
* @param $audience Integer: one of:
* Revision::FOR_PUBLIC to be displayed to all users
* Revision::FOR_THIS_USER to be displayed to the given user
* Revision::RAW get the text regardless of permissions
* @return string|null the content of the revision as some kind of string,
* or an empty string if it can not be found
*/
static function revisionToString( $revision, $audience = Revision::FOR_THIS_USER ) {
if ( !$revision instanceof Revision ) {
return '';
}
$content = $revision->getContent( $audience );
if ( $content === null ) {
return '';
}
$result = self::contentToString( $content );
return $result;
}
/**
* Converts the given Content object to a string.
*
* This uses Content::getNativeData() if $content is an instance of TextContent,
* or Content::getTextForSearchIndex() otherwise.
*
* The hook 'AbuseFilter::contentToString' can be used to override this
* behavior.
*
* @param Content $content
*
* @return string a suitable string representation of the content.
*/
static function contentToString( Content $content ) {
$text = null;
if ( Hooks::run( 'AbuseFilter-contentToString', array( $content, &$text ) ) ) {
$text = $content instanceof TextContent
? $content->getNativeData()
: $content->getTextForSearchIndex();
}
if ( is_string( $text ) ) {
// bug 20310
// XXX: Is this really needed? Should we rather apply PST?
$text = str_replace( "\r\n", "\n", $text );
} else {
$text = '';
}
return $text;
}
/*
* Get the history ID of the first change to a given filter
*
* @param $filterId integer: Filter id
* @return integer|bool
*/
public static function getFirstFilterChange( $filterID ) {
static $firstChanges = array();
if ( !isset( $firstChanges[$filterID] ) ) {
$dbr = wfGetDB( DB_SLAVE );
$row = $dbr->selectRow(
'abuse_filter_history',
'afh_id',
array(
'afh_filter' => $filterID,
),
__METHOD__,
array( 'ORDER BY' => 'afh_timestamp ASC' )
);
$firstChanges[$filterID] = $row->afh_id;
}
return $firstChanges[$filterID];
}
}
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