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<?php
if ( !defined( 'MEDIAWIKI' ) ) {
exit;
}
class SpamBlacklist extends BaseBlacklist {
/**
* Returns the code for the blacklist implementation
*
* @return string
*/
protected function getBlacklistType() {
return 'spam';
}
/**
* Apply some basic anti-spoofing to the links before they get filtered,
* see @bug 12896
*
* @param string $text
*
* @return string
*/
protected function antiSpoof( $text ) {
$text = str_replace( '．', '.', $text );
return $text;
}
/**
* @param string[] $links An array of links to check against the blacklist
* @param Title $title The title of the page to which the filter shall be applied.
* This is used to load the old links already on the page, so
* the filter is only applied to links that got added. If not given,
* the filter is applied to all $links.
* @param boolean $preventLog Whether to prevent logging of hits. Set to true when
* the action is testing the links rather than attempting to save them
* (e.g. the API spamblacklist action)
*
* @return Array Matched text(s) if the edit should not be allowed, false otherwise
*/
function filter( array $links, Title $title = null, $preventLog = false ) {
$blacklists = $this->getBlacklists();
$whitelists = $this->getWhitelists();
if ( count( $blacklists ) ) {
// poor man's anti-spoof, see bug 12896
$newLinks = array_map( array( $this, 'antiSpoof' ), $links );
$oldLinks = array();
if ( $title !== null ) {
$oldLinks = $this->getCurrentLinks( $title );
$addedLinks = array_diff( $newLinks, $oldLinks );
} else {
// can't load old links, so treat all links as added.
$addedLinks = $newLinks;
}
wfDebugLog( 'SpamBlacklist', "Old URLs: " . implode( ', ', $oldLinks ) );
wfDebugLog( 'SpamBlacklist', "New URLs: " . implode( ', ', $newLinks ) );
wfDebugLog( 'SpamBlacklist', "Added URLs: " . implode( ', ', $addedLinks ) );
$links = implode( "\n", $addedLinks );
# Strip whitelisted URLs from the match
if( is_array( $whitelists ) ) {
wfDebugLog( 'SpamBlacklist', "Excluding whitelisted URLs from " . count( $whitelists ) .
" regexes: " . implode( ', ', $whitelists ) . "\n" );
foreach( $whitelists as $regex ) {
wfSuppressWarnings();
$newLinks = preg_replace( $regex, '', $links );
wfRestoreWarnings();
if( is_string( $newLinks ) ) {
// If there wasn't a regex error, strip the matching URLs
$links = $newLinks;
}
}
}
# Do the match
wfDebugLog( 'SpamBlacklist', "Checking text against " . count( $blacklists ) .
" regexes: " . implode( ', ', $blacklists ) . "\n" );
$retVal = false;
foreach( $blacklists as $regex ) {
wfSuppressWarnings();
$matches = array();
$check = ( preg_match_all( $regex, $links, $matches ) > 0 );
wfRestoreWarnings();
if( $check ) {
wfDebugLog( 'SpamBlacklist', "Match!\n" );
global $wgRequest;
$ip = $wgRequest->getIP();
$fullUrls = array();
$fullLineRegex = substr( $regex, 0, strrpos( $regex, '/' ) ) . '.*/Sim';
preg_match_all( $fullLineRegex, $links, $fullUrls );
$imploded = implode( ' ', $fullUrls[0] );
wfDebugLog( 'SpamBlacklistHit', "$ip caught submitting spam: $imploded\n" );
if( !$preventLog ) {
$this->logFilterHit( $title, $imploded ); // Log it
}
if( $retVal === false ){
$retVal = array();
}
$retVal = array_merge( $retVal, $fullUrls[1] );
}
}
if ( is_array( $retVal ) ) {
$retVal = array_unique( $retVal );
}
} else {
$retVal = false;
}
return $retVal;
}
/**
* Look up the links currently in the article, so we can
* ignore them on a second run.
*
* WARNING: I can add more *of the same link* with no problem here.
* @param $title Title
* @return array
*/
function getCurrentLinks( $title ) {
$dbr = wfGetDB( DB_SLAVE );
$id = $title->getArticleID(); // should be zero queries
$res = $dbr->select( 'externallinks', array( 'el_to' ),
array( 'el_from' => $id ), __METHOD__ );
$links = array();
foreach ( $res as $row ) {
$links[] = $row->el_to;
}
return $links;
}
/**
* Returns the start of the regex for matches
*
* @return string
*/
public function getRegexStart() {
return '/(?:https?:)?\/\/+[a-z0-9_\-.]*(';
}
/**
* Returns the end of the regex for matches
*
* @param $batchSize
* @return string
*/
public function getRegexEnd( $batchSize ) {
return ')' . parent::getRegexEnd( $batchSize );
}
/**
* Logs the filter hit to Special:Log if
* $wgLogSpamBlacklistHits is enabled.
*
* @param Title $title
* @param string $url URL that the user attempted to add
*/
public function logFilterHit( $title, $url ) {
global $wgUser, $wgLogSpamBlacklistHits;
if ( $wgLogSpamBlacklistHits ) {
$logEntry = new ManualLogEntry( 'spamblacklist', 'hit' );
$logEntry->setPerformer( $wgUser );
$logEntry->setTarget( $title );
$logEntry->setParameters( array(
'4::url' => $url,
) );
$logid = $logEntry->insert();
$logEntry->publish( $logid, "rc" );
}
}
}
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